CN210801006U - Vehicle lamp - Google Patents
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- CN210801006U CN210801006U CN201921588518.6U CN201921588518U CN210801006U CN 210801006 U CN210801006 U CN 210801006U CN 201921588518 U CN201921588518 U CN 201921588518U CN 210801006 U CN210801006 U CN 210801006U
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Abstract
Provided is a vehicle lamp capable of forming a predetermined light distribution pattern while suppressing a decrease in energy efficiency. A headlamp (1) is provided with: light sources (52R, 52G, 52B); and a phase modulation element assembly (54) having phase modulation elements (54R, 54G, 54B), wherein the phase modulation elements (54R, 54G, 54B) have a plurality of modulation units (MPR, MPG, MPB) which diffract light (LR, LG, LB) from the light sources (52R, 52G, 52B) to form the light (LR, LG, LB) into a predetermined light distribution pattern. The width (H54) in the longitudinal direction of the incident surface of the phase modulation element (54R, 54G, 54B) is greater than the width (WR, WG, WB) in the lateral direction of the incident surface, the size of the incident point (SR, SG, SB) of the light (LR, LG, LB) of the phase modulation element (54R, 54G, 54B) is such a size that at least one modulation unit (MPR, MPG, MPB) can be included, and at least a part of the plurality of modulation units (MPR, MPG, MPB) are arranged in the longitudinal direction.
Description
Technical Field
The utility model relates to a lamp for vehicle.
Background
In a vehicle lamp represented by a headlamp for an automobile, various configurations have been studied in order to make a light distribution pattern of emitted light a predetermined light distribution pattern. For example, in patent document 1 described below, a predetermined light distribution pattern is formed by a hologram element which is a type of phase modulating element.
The vehicle lamp described in patent document 1 includes a hologram element and a light source for irradiating the hologram element with reference light. The hologram element performs calculation so that diffracted light regenerated by irradiation with the reference light forms a predetermined light distribution pattern.
Patent document 1 (Japanese unexamined patent application publication No. 2012-146621)
Here, the vehicle vibrates due to the condition of the road surface or the like, and the vehicle lamp also vibrates similarly to the vehicle. Therefore, in the vehicle lamp described in patent document 1, the incident point of the reference light on the hologram element may vibrate with respect to the hologram element due to vibration of the vehicle, and the reference light may not be irradiated to a part of the hologram element. Therefore, in this vehicle lamp, since a predetermined light distribution pattern may not be formed due to vibration of the vehicle, it is desirable that the predetermined light distribution pattern can be formed even if the vibration occurs. In response to this demand, it is considered that the reference light is irradiated to the entire hologram element even if the incident point of the reference light is increased and vibration occurs. However, in this case, since a part of the reference light is not irradiated to the hologram element, energy efficiency is lowered.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to provide a vehicle lamp capable of forming a predetermined light distribution pattern while suppressing a decrease in energy efficiency.
Means for solving the problems
In order to achieve the above object, the present invention provides a lamp for a vehicle, comprising: a light source that emits light; a phase modulation element having a plurality of modulation units that diffract the light from the light source to form a predetermined light distribution pattern; the width of an incident surface of the phase modulation element on which the light is incident in the vertical direction is larger than the width of the incident surface in the horizontal direction, the size of the incident point of the light on the phase modulation element is a size that can include at least one modulation unit, and at least one of the plurality of modulation units is arranged in the vertical direction.
The amplitude of the vibration of the vehicle in the vertical direction tends to be larger than the amplitude in the horizontal direction, and the vehicle lamp vibrates similarly to the vehicle. Therefore, the incident point of the light on the phase modulation element tends to vibrate in the vertical direction as compared with the horizontal direction. In this vehicle lamp, as described above, the width of the light incident surface of the phase modulation element in the vertical direction is larger than the width of the light incident surface in the horizontal direction. Therefore, even when the incident point vibrates in the vertical direction due to the vibration of the vehicle, the vehicle lamp can suppress a part of the incident point from being exposed from the incident surface of the phase modulation element, and can suppress a decrease in energy efficiency. In this vehicle lamp, as described above, the size of the incident point is a size capable of including at least one modulation unit, and at least a part of the plurality of modulation units are arranged in the vertical direction. Therefore, in this vehicle lamp, even when the incident point vibrates in the vertical direction due to the vibration of the vehicle, the light can be incident on any one of the modulation portions, and therefore a predetermined light distribution pattern can be formed.
The incident point may be in the shape of a long strip that is longer in a specific direction than in other directions, the specific direction being non-parallel to the horizontal direction.
With such a configuration, the width of the incident point in the horizontal direction can be reduced as compared with the case where the specific direction is parallel to the horizontal direction. Therefore, as compared with the case where the specific direction is parallel to the horizontal direction, the width of the phase modulation element in the horizontal direction can be reduced, and the manufacturing cost of the vehicle lamp can be reduced.
Alternatively, the incident point may have a long shape that is longer in a specific direction than in other directions, and the specific direction may not be parallel to the vertical direction.
With this configuration, the width of the incident point in the vertical direction can be reduced as compared with the case where the specific direction is parallel to the vertical direction. Therefore, compared to the case where the specific direction is parallel to the vertical direction, it is possible to suppress a part of the incident point from being exposed from the incident surface of the phase modulation element when the incident point vibrates in the vertical direction due to the vibration of the vehicle.
The plurality of modulation units may be arranged in the vertical direction and the horizontal direction, and the number of modulation units arranged in the vertical direction may be larger than the number of modulation units arranged in the horizontal direction.
With this configuration, it is easier to cause light from the light source to enter any one of the modulation sections when the incident point vibrates in the vertical direction due to vibration of the vehicle, as compared to a case where the number of modulation sections arranged in the vertical direction is smaller than the number of modulation sections arranged in the horizontal direction.
The vehicle lamp may further include a plurality of the light sources, the phase modulation element may be provided for each of the plurality of the light sources, and a width in the vertical direction of the incident point of the phase modulation element having the largest optical path length of the corresponding light source among the plurality of the phase modulation elements may be equal to or smaller than a largest width among widths in the vertical direction of the incident points of the other phase modulation elements.
The amplitude of the vibration of the incident point with respect to the phase modulation element tends to increase as the optical path length between the phase modulation element and the light source increases. In this vehicle lamp, the width of the incident point of the phase modulation element in the vertical direction, at which the amplitude of the vibration of the incident point with respect to the phase modulation element is likely to increase, is equal to or less than the maximum width among the widths of the incident points of the other phase modulation elements in the vertical direction. Therefore, even if the width of the incident surface of the phase modulation element in the vertical direction and the optical path length between the phase modulation element and the light source are not adjusted, it is possible to suppress a part of the incident point of the phase modulation element, which is likely to increase the amplitude of the vibration of the phase modulation element with respect to the incident point, from being exposed from the incident surface of the phase modulation element. Therefore, the degree of freedom in the size of the phase modulation element and the arrangement of the phase modulation element with respect to the light source can be increased.
The light source may be provided in plural, and the phase modulation element may be provided in each of the plural light sources, and at least one of the phase modulation elements may be connected to at least one other of the phase modulation elements and integrally formed with the other phase modulation element.
In this vehicle lamp, since at least two phase modulation elements are integrally formed, the number of components can be reduced.
Effect of the utility model
With the above configuration, the present invention can provide a vehicle lamp capable of forming a predetermined light distribution pattern while suppressing a decrease in energy efficiency.
Drawings
Fig. 1 is a diagram schematically showing a vehicle lamp according to a first embodiment of the present invention.
Fig. 2 is an enlarged view of the optical system unit shown in fig. 1.
Fig. 3 is a front view of the bit modulation element assembly shown in fig. 2.
Fig. 4 is a view schematically showing a part of a cross section in the thickness direction of the phase modulation element assembly shown in fig. 3.
Fig. 5 is a view showing a light distribution pattern.
Fig. 6 is a view showing an optical system unit according to a second embodiment of the present invention, similarly to fig. 2.
Fig. 7 is a front view of a phase modulation element according to a third embodiment of the present invention.
Description of the reference numerals
1 front shining lamp (vehicle lamp)
10 frame body
20 luminaire unit
50 optical system unit
52R first light source
52G second light source
52B third light source
54 phase modulation element assembly
54R first phase modulation element
54G second phase modulation element
54B third phase modulation element
54S phase modulation element
55 synthetic optical system
155 light guide optical system
EF, EFR, EFG, EFB entrance face
LAR, LAG, LAB Long axis
MPR, MPG, MPB modulation section
SR, SG, SB incident point
Width of H54 phase modulation element in longitudinal direction
Width of WR first phase modulation element in transverse direction
Width of WG second phase modulation element in transverse direction
Lateral width of WB third phase modulation element
Transverse width of WS phase modulation element
Detailed Description
Hereinafter, embodiments for implementing the vehicle lamp according to the present invention will be described together with the drawings. The following exemplary embodiments are provided for easy understanding of the present invention, and are not intended to limit the present invention. The present invention can be modified and improved according to the following embodiments without departing from the scope of interest.
(first embodiment)
Fig. 1 is a view showing a vehicle lamp according to the present embodiment, and is a view schematically showing a cross section in a vertical direction of the vehicle lamp. The vehicle lamp of the present embodiment is a headlamp 1 for an automobile. The automotive headlamps are respectively arranged in the left and right directions in front of the vehicle, and the left and right headlamps are configured to be substantially symmetrical in the left and right directions. Therefore, in the present embodiment, one headlamp will be described. As shown in fig. 1, the headlamp 1 of the present embodiment includes a housing 10 and a lamp unit 20 as main components.
The housing 10 has a lamp housing 11, a front cover 12, and a rear cover 13 as main components. The front cover 12 is fixed to the lamp housing 11 so as to close a front opening of the lamp housing 11. An opening smaller than the front is formed in the rear of the lamp housing 11, and the rear cover 13 is fixed to the lamp housing 11 so as to close the opening.
A space formed by the lamp housing 11, the front cover 12 closing the opening in the front of the lamp housing 11, and the rear cover 13 closing the opening in the rear of the lamp housing 11 serves as a lamp chamber R in which the lamp unit 20 is housed.
The lamp unit 20 of the present embodiment has the heat sink 30, the cooling fan 35, the cover 40, and the optical system unit 50 as main components, and is fixed to the housing 10 by a structure not shown in the drawings.
The heat sink 30 has a metal bottom plate 31 extending substantially in the horizontal direction, and a plurality of heat radiating fins 32 are provided integrally with the bottom plate 31 on the lower surface side of the bottom plate 31. The cooling fan 35 is disposed with a gap from the heat radiation fins 32 and fixed to the heat sink 30. The radiator 30 is cooled by an air flow generated by the rotation of the cooling fan 35. Further, a cover 40 is disposed on the upper surface of the bottom plate 31 of the heat sink 30.
The cover 40 is fixed to the bottom plate 31 of the heat sink 30. The cover 40 is substantially rectangular and is made of metal such as aluminum, for example. An optical system unit 50 is housed in a space inside the cover 40. An opening 40H through which light emitted from the optical system unit 50 can pass is formed in the front portion of the cover 40. In order to impart light absorption to the inner walls of the cover 40, it is preferable to perform black alumite processing or the like on these inner walls. By making the inner walls of the cover 40 light-absorbing, even when light is irradiated to these inner walls due to unexpected reflection, or the like, reflection of the irradiated light can be suppressed and the light can be emitted from the opening 40H in an unexpected direction.
Fig. 2 is an enlarged view of the optical system unit shown in fig. 1. In fig. 2, the radiator 30, the cover 40, and the like are omitted for ease of understanding. As shown in fig. 2, the optical system unit 50 of the present embodiment includes a first light-emitting optical system 51R, a second light-emitting optical system 51G, a third light-emitting optical system 51B, a light guide optical system 155, and a phase modulation element assembly 54.
The first light-emitting optical system 51R has a first light source 52R and a first collimating lens 53R. The first light source 52R is a laser element that emits laser light in a predetermined wavelength band, and in the present embodiment, is a semiconductor laser that emits red laser light having a peak wavelength of power of 638nm, for example. The optical system unit 50 includes a circuit board, not shown, on which the first light source 52R is mounted.
The first collimating lens 53R is a lens that collimates the laser light emitted from the first light source 52R in the fast axis direction and the slow axis direction. The red light LR emitted from the first collimating lens 53R is emitted from the first light-emitting optical system 51R. Instead of the first collimating lens 53R, a collimating lens for collimating the laser beam in the fast axis direction and a collimating lens for collimating the laser beam in the slow axis direction may be provided.
The second light emission optical system 51G includes a second light source 52G and a second collimator lens 53G, and the third light emission optical system 51B includes a third light source 52B and a third collimator lens 53B. The light sources 52G and 52B are laser elements that emit laser beams in predetermined wavelength bands, respectively. In the present embodiment, the second light source 52G is a semiconductor laser for emitting a green laser beam having a peak wavelength of power of, for example, 515nm, and the third light source 52B is a semiconductor laser for emitting a blue laser beam having a peak wavelength of power of, for example, 445 nm. Therefore, in the present embodiment, the three light sources 52R, 52G, and 52B emit laser beams in predetermined wavelength bands different from each other. The light sources 52G and 52B are mounted on the circuit board, respectively, in the same manner as the first light source 52R.
The second collimator lens 53G is a lens for collimating the fast axis direction and the slow axis direction of the laser beam emitted from the second light source 52G, and the third collimator lens 53B is a lens for collimating the fast axis direction and the slow axis direction of the laser beam emitted from the third light source 52B. The green light LG emitted from the second collimator lens 53G is emitted from the second light-emitting optical system 51G, and the blue light LB emitted from the third collimator lens 53B is emitted from
The third light-emitting optical system 51B emits light. Instead of the collimator lenses 53G and 53B, a collimator lens for collimating the laser beam in the fast axis direction and a collimator lens for collimating the laser beam in the slow axis direction may be provided.
The light guide optical system 155 guides the light LR emitted from the first light emitting optical system 51R, the light LG emitted from the second light emitting optical system 51G, and the light LB emitted from the third light emitting optical system 51B to the phase modulation element assembly 54. The light guide optical system 155 of the present embodiment includes a mirror 155m, a first optical element 155f, and a second optical element 155 s. The reflecting mirror 155m reflects the light LR emitted from the first light-emitting optical system 51R. The first optical element 155f transmits the light LR reflected by the reflecting mirror 155m and reflects the light LG emitted from the second light emission optical system 51G. The second optical element 155s transmits the light LR transmitted through the first optical element 155f and the light LG reflected by the first optical element 155f, and reflects the light LB emitted from the third light-emitting optical system 51B. As the first optical element 155f, the second optical element 155s may be a wavelength selective filter in which an oxide film is laminated on a glass substrate. By controlling the type and thickness of the oxide film, light having a wavelength longer than a predetermined wavelength can be transmitted, and light having a wavelength shorter than the predetermined wavelength can be reflected.
The light guide optical system 155 of the present embodiment does not synthesize these lights LR, LG, and LB, and outputs them in parallel in the left-right direction, and these lights LR, LG, and LB are incident on the phase modulator element assembly 54. In the present embodiment, the lights LR, LG, and LB are arranged in a direction perpendicular to the paper surface of fig. 2. In fig. 2, the light LR, the light LG, and the light LB are shown by solid lines, broken lines, and single-dot chain lines, respectively, and are shown offset from each other.
The phase modulation element assembly 54 diffracts incident light to form the light into a predetermined light distribution pattern. The phase modulation element assembly 54 of the present embodiment is arranged such that the incident surface EF on which light enters is inclined at approximately 45 degrees with respect to the vertical direction, and light LR, LG, and LB emitted from the light guide optical system 155 enters the incident surface EF. The incident surface EF may not be parallel to the horizontal direction, and for example, the phase modulation element assembly 54 may be disposed such that the incident surface EF is substantially parallel to the vertical direction. In the present embodiment, the optical path length from the phase modulation element assembly 54 to the first light source 52R of the first light emission optical system 51R is longer than the optical path length from the phase modulation element assembly 54 to the second light source 52G of the second light emission optical system 51G. The optical path length from the phase modulation element assembly 54 to the second light source 52G of the second light emission optical system 51G is longer than the optical path length from the phase modulation element assembly 54 to the third light source 52B of the third light emission optical system 51B.
As described above, the phase modulation element aggregate 54 includes a plurality of phase modulation elements. Specifically, the phase modulation element aggregate 54 includes: a phase modulation element that diffracts the light LR from the first light-emitting optical system 51R to form the light LR into a predetermined light distribution pattern, a phase modulation element that diffracts the light LG from the second light-emitting optical system 51G to form the light LG into a predetermined light distribution pattern, and a phase modulation element that diffracts the light LB from the third light-emitting optical system 51B to form the light LB into a predetermined light distribution pattern. The three phase modulation elements are arranged in parallel in one direction, and the incident surface EF of the phase modulation element aggregate 54 is formed by the incident surfaces of the light of these phase modulation elements.
In the present embodiment, each of the three phase modulation elements is a reflective phase modulation element that reflects and diffracts incident light to emit the light, and specifically, is a reflective LCOS (Liquid Crystal On Silicon). Therefore, the phase modulation element assembly 54 is diffracted by the phase modulation elements corresponding to the light beams LR, LG, and LB incident on the incident surface EF, and the first light DLR diffracting the red light beam LR, the second light DLG diffracting the green light beam LG, and the third light DLB diffracting the blue light beam LB are emitted from the incident surface EF. The light DLR, DLG, and DLB thus emitted from the phase modulation element assembly 54 is emitted from the optical system unit 50. In fig. 1 and 2, the first light DLR is indicated by a solid line, the second light DLG is indicated by a broken line, and the third light DLB is indicated by a one-dot chain line, and these lights DLR, DLG, and DLB are shown as being shifted from each other.
Next, the structure of the phase modulation element assembly 54 of the present embodiment will be described in detail.
Fig. 3 is a front view of the phase modulation element assembly shown in fig. 2. Fig. 3 is a front view of the phase modulation element assembly 54 as viewed from the incident surface EF side on which light is incident, and fig. 3 schematically shows the phase modulation element assembly 54. The phase modulation element assembly 54 of the present embodiment is formed in a substantially rectangular shape elongated in the horizontal direction in the front view, and the entire region in the front view is the incident surface EF. Therefore, the incident surface EF of the phase modulation element assembly 54 can be understood as being formed in a substantially rectangular shape that is long in the horizontal direction. In the following description, a direction parallel to the horizontal direction in the front view of the phase modulation element assembly 54 is a horizontal direction, and a direction perpendicular to the horizontal direction is a vertical direction. Therefore, the lateral direction is a direction parallel to the horizontal direction, the vertical direction is a direction parallel to a direction projected from the vertical direction to the incident surface EF, and the vertical direction is a direction parallel to the vertical direction in the front view.
The phase modulation element assembly 54 of the present embodiment includes: a first phase modulation element 54R corresponding to the first light emission optical system 51R, a second phase modulation element 54G corresponding to the second light emission optical system 51G, and a third phase modulation element 54B corresponding to the third light emission optical system 51B. The first phase modulation element 54R, the second phase modulation element 54G, and the third phase modulation element 54B are arranged adjacent to each other in the lateral direction, and the first phase modulation element 54R and the third phase modulation element 54B are connected to the second phase modulation element 54G. That is, the phase modulation element assembly has a structure in which the phase modulation elements 54R, 54G, and 54B are integrally formed. A drive circuit 60R is electrically connected to the phase modulation element assembly 54. The drive circuit 60R includes a scanning line drive circuit connected to the lateral side of the phase modulation element assembly 54 and a data line drive circuit connected to one side of the phase modulation element assembly 54 in the longitudinal direction. Electric power is supplied to the phase modulation elements 54R, 54G, and 54B constituting the phase modulation element assembly 54 through the drive circuit 60R.
The width in the longitudinal direction of the first phase modulation element 54R, the width in the longitudinal direction of the second phase modulation element 54G, and the width in the longitudinal direction of the third phase modulation element 54B are the same as the width H54 in the longitudinal direction of the phase modulation element aggregate 54. The width WR of the first phase modulation element 54R in the lateral direction, the width WG of the second phase modulation element 54G in the lateral direction, and the width WB of the third phase modulation element 54B in the lateral direction are smaller than the width H54 of the phase modulation element aggregate 54 in the longitudinal direction. That is, the phase modulation elements 54R, 54G, and 54B are formed in a substantially rectangular shape elongated in the vertical direction, i.e., the vertical direction. As described above, since the entire region of the phase modulation element assembly 54 in the front view is the incident surface EF and the incident surface EF of the phase modulation element assembly 54 is formed by the incident surfaces of the light of the phase modulation elements 54R, 54G, and 54B, the incident surfaces of the light of the phase modulation elements 54R, 54G, and 54B are also formed in a substantially rectangular shape elongated in the vertical direction, that is, the vertical direction. Therefore, the width H54 in the longitudinal direction of the incident surface of the first phase modulation element 54R is larger than the width WR in the lateral direction of the incident surface of the first phase modulation element 54R, the width H54 in the longitudinal direction of the incident surface of the second phase modulation element 54G is larger than the width WG in the lateral direction of the incident surface of the second phase modulation element 54G, and the width H54 in the longitudinal direction of the incident surface of the third phase modulation element 54B is larger than the width WB in the lateral direction of the incident surface of the third phase modulation element 54B. In the present embodiment, the width WG of the second phase modulation element 54G in the lateral direction is substantially the same as the width WB of the third phase modulation element 54B in the longitudinal direction, and the width WR of the first phase modulation element 54R in the lateral direction is larger than these widths WG and WB. Therefore, the widths WG and WB of the incident surfaces of the phase modulation elements 54G and 54B in the lateral direction are substantially the same, and the width WR of the incident surface of the first phase modulation element 54R in the lateral direction is larger than these widths WG and WB.
The first phase modulation element 54R has a plurality of modulators MPR arranged in a matrix. The second phase modulation element 54G is provided with a plurality of modulation sections MPG arranged in a matrix, and the third phase modulation element 54B is provided with a plurality of modulation sections MPB arranged in a matrix. In the present embodiment, the modulators MPR, MPG, and MPB are squares having the same size. Therefore, the number of the modulators MPR arranged in the vertical direction is larger than the number of the modulators MPR arranged in the horizontal direction. The number of modulation units MPG arranged in the vertical direction is larger than the number of modulation units MPG arranged in the horizontal direction, and the number of modulation units MPB arranged in the vertical direction is larger than the number of modulation units MPB arranged in the horizontal direction. Each of the modulators MPR, MPG, and MPB includes a plurality of dots arranged in a matrix, and light incident on the modulators MPR, MPG, and MPB is diffracted and emitted.
The red light LR emitted from the light guide optical system 155 is incident on the first phase modulation element 54R, and the first phase modulation element 54R emits the first light DLR diffracted by the light LR. The green light LG emitted from the light guide optical system 155 is incident on the second phase modulation element 54G, and the second phase modulation element 54G emits the second light DLG which diffracts the light LG. The blue light LB emitted from the light guide optical system 155 is incident on the third phase modulation element 54B, and the third phase modulation element 54B emits the third light DLB diffracted by the light LB.
Fig. 3 shows an incident point SR which is a region irradiated with red light LR, an incident point SG which is a region irradiated with green light LG, and an incident point SB which is a region irradiated with blue light LB. In the present embodiment, since the light sources 52R, 52G, and 52B are semiconductor laser light as described above, the laser light emitted from the light sources 52R, 52G, and 52B propagates while spreading in a substantially elliptical shape. The fast axis direction and slow axis direction of the laser beams emitted from the light sources 52R, 52G, and 52B are collimated by the collimating lenses 53R, 53G, and 53B, respectively, but the shapes of the laser beams are not adjusted. Thus, the light LR, LG, and LB having no shape adjusted is emitted from the light emitting optical systems 51R, 51G, and 51B, and is incident on the phase modulation element aggregate 54 via the light guide optical system 155. In the present embodiment, in the light guide optical system 155, since the shapes of the lights LR, LG, and LB are not adjusted, the shapes of the incident points SR, SG, and SB are substantially elliptical.
In the present embodiment, the size of the incident point SR having a substantially elliptical shape is such that at least one modulation unit MPR can be included, and the long axis LAR of the incident point SR is substantially parallel to the lateral direction. In other words, the incident point SR has a substantially elliptical shape elongated in the horizontal direction, and the longitudinal direction of the incident point SR is not parallel to the longitudinal direction. The size of the incident point SG having a substantially elliptical shape is such that at least one modulation unit MPG can be included, and the long axis LAG of the incident point SG is substantially parallel to the longitudinal direction. In other words, incident point SG has a substantially elliptical shape elongated in the longitudinal direction, and the longitudinal direction of incident point SG is not parallel to the lateral direction. The size of the incident point SB having a substantially elliptical shape is such that it can include at least one modulation unit MPB, and the long axis LAB of the incident point SB is substantially parallel to the longitudinal direction. In other words, the incident point SB is a substantially elliptical shape elongated in the longitudinal direction, and the longitudinal direction of the incident point SB is not parallel to the lateral direction.
In the present embodiment, the width SHR in the vertical direction of the incident point SR of the first phase modulation element 54R is smaller than the width SHG in the vertical direction of the incident point SG of the second phase modulation element 54G. The longitudinal width SHG of the incident point SG is substantially the same as the longitudinal width SHB of the incident point SB of the third phase modulation element 54B. Further, the width SHG and the width SHB may be different from each other.
Fig. 4 is a view schematically showing a part of a cross section in the thickness direction of the phase modulation element assembly shown in fig. 3. As shown in fig. 4, the phase modulation element assembly 54 of the present embodiment has a main configuration of a silicon substrate 62, a driving circuit layer 63, a plurality of electrodes 64, a reflective film 65, a liquid crystal layer 66, a transparent electrode 67, and a light-transmissive substrate 68.
The plurality of electrodes 64 are arranged in a matrix on one surface side of the silicon substrate 62 in a one-to-one correspondence with the respective points. The driving circuit layer 63 is a layer in which circuits connected to the scanning line driving circuit and the data line driving circuit of the driving circuit 60R shown in fig. 3 are arranged, and is arranged between the silicon substrate 62 and the plurality of electrodes 64. The transparent substrate 68 is disposed on one side of the silicon substrate 62 so as to face the silicon substrate 62, and is, for example, a glass substrate. The transparent electrode 67 is disposed on the surface of the translucent substrate 68 on the silicon substrate 62 side. The liquid crystal layer 66 has liquid crystal molecules 66a, and is disposed between the plurality of electrodes 64 and the transparent electrode 67. The reflective film 65 is disposed between the plurality of electrodes 64 and the liquid crystal layer 66, and is, for example, a dielectric multilayer film. The light LR emitted from the light guide optical system 155 enters from the incident surface EF on the side opposite to the silicon substrate 62 side of the light transmissive substrate 68.
As shown in fig. 4, light RL incident from an incident surface EF on the side opposite to the silicon substrate 62 side of the transparent substrate 68 passes through the transparent electrode 67 and the liquid crystal layer 66, is reflected by the reflective film 65, passes through the liquid crystal layer 66 and the transparent electrode 67, and is emitted from the transparent substrate 68. When a voltage is applied between a specific electrode 64 and the transparent electrode 67, the alignment of the liquid crystal molecules 66a of the liquid crystal layer 66 located between the electrode 64 and the transparent electrode 67 changes. The change in the alignment of the liquid crystal molecules 66a changes the reflectance of the liquid crystal layer 66 between the electrode 64 and the transparent electrode 67, and changes the optical path length of the light RL transmitted through the liquid crystal layer 66. Therefore, when the light RL is transmitted through the liquid crystal layer 66 and emitted from the liquid crystal layer 66, the phase of the light RL emitted from the liquid crystal layer 66 can be changed according to the phase of the light RL incident on the liquid crystal layer 66. As described above, since the plurality of electrodes 64 are arranged for each point DT of the modulators MPR, MPG, and MPB, the alignment of the liquid crystal molecules 66a can be changed by controlling the voltage applied between the electrode 64 corresponding to each point DT and the transparent electrode 67, and the amount of change in the phase of light emitted from each point DT is adjusted according to each point DT. Since the lights having different phases interfere with each other and are diffracted, the light emitted from the point DT interferes and is diffracted, and the diffracted light is emitted from the phase modulation element assembly 54. Therefore, the phase modulation element assembly 54 can diffract and emit the incident light by adjusting the reflectance of the liquid crystal layer 66 at each point, and can make the light distribution pattern of the emitted light a desired light distribution pattern. The phase modulation element assembly 54 can change the light distribution pattern of the emitted light or change the direction of the emitted light to change the region to which the light is irradiated by changing the reflectance of the liquid crystal layer 66 at each point.
In the present embodiment, the same phase modulation pattern is formed in each of the modulation sections MPR of the first phase modulation element 54R of the phase modulation element assembly 54. The same phase modulation pattern is formed in each modulation section MPG of the second phase modulation element 54G, and the same phase modulation pattern is formed in each modulation section MPB of the third phase modulation element 54B. In the present specification, the phase modulation pattern means a pattern for modulating the phase of incident light. In the present embodiment, the phase modulation pattern is a pattern of the reflectance of the liquid crystal layer 66 at each point DT, and can be understood as a pattern of a voltage applied between the electrode 64 and the transparent electrode 67 corresponding to each point DT. By adjusting the phase modulation pattern, the light distribution pattern of the emitted light can be made to be a desired light distribution pattern. In the present embodiment, the phase modulation patterns of the modulators MPR, MPG, and MPB are different phase modulation patterns from each other.
Specifically, in the present embodiment, the phase modulation patterns of the modulators MPR, MPG, and MPB are phase modulation patterns that diffract the lights LR, LG, and LB, respectively, so that the light obtained by combining the first light DLR emitted from the first phase modulation element 54R, the second light DLG emitted from the second phase modulation element 54G, and the third light DLB emitted from the third phase modulation element 54B becomes a light distribution pattern of low beams. In other words, the phase modulation elements 54R, 54G, and 54B of the phase modulation element assembly 54 diffract the incident light LR, LG, and LB so that the light combined with the light DLR, DLG, and DLB emitted from the phase modulation elements 54R, 54G, and 54B becomes a light distribution pattern of low beam. The light distribution pattern also includes an intensity distribution. Therefore, in the present embodiment, the first light DLR emitted from the first phase modulation element 54R is an intensity distribution that overlaps with the light distribution pattern of the low beam and is based on the intensity distribution of the light distribution pattern of the low beam. The second light DLG emitted from the second phase modulation element 54G is an intensity distribution that overlaps the light distribution pattern of the low beam and is based on the intensity distribution of the light distribution pattern of the low beam. The third light DLB emitted from the third phase modulating element 54B is an intensity distribution that overlaps the light distribution pattern of the low beam and is based on the intensity distribution of the light distribution pattern of the low beam. As described above, the phase modulation elements 54R, 54G, and 54B have the plurality of modulation units MPR, MPG, and MPB that form the same phase modulation patterns, respectively, and diffract the light LR, LG, and LB so that the respective modulation units MPR, MPG, and MPB form the light distribution patterns. It is preferable that the phase modulation elements 54R, 54G, and 54B diffract the incident lights LR, LG, and LB so that the outer shape of the light distribution pattern of the lights DLR, DLG, and DLB emitted from the phase modulation elements 54R, 54G, and 54B matches the outer shape of the light distribution pattern of the low beam. In this way, the first phase modulation element 54R emits light DLR of a red component of the light distribution pattern of low beam, the second phase modulation element 54G emits light DLG of a green component of the light distribution pattern of low beam, and the third phase modulation element 54B emits light DLB of a blue component of the light distribution pattern of low beam.
Next, light emission from the headlamp 1 will be described. Specifically, a case where the low beam is emitted from the headlamp 1 will be described.
By supplying power from a power supply not shown to the light sources 52R, 52G, and 52B, respectively, the first light source 52R emits red laser light, the second light source 52G emits green laser light, and the third light source 52B emits blue laser light. These laser beams are collimated by the collimator lenses 53R, 53G, and 53B and then emitted from the light emitting optical systems 51R, 51G, and 51B. The light LR, LG, and LB emitted from the light emitting optical systems 51R, 51G, and 51B enters the light guide optical system 155.
In the light guide optical system 155, the light LR from the first light emission optical system 51R is reflected by the mirror 155m, passes through the first optical element 155f and the second optical element 155s, and is emitted from the light guide optical system 155. Thus, the light LR emitted from the light guide optical system 155 enters the first phase modulation element 54R of the phase modulation element assembly 54. That is, the light LR is guided to the first phase modulation element 54R of the phase modulation element assembly 54 by the light guide optical system 155. The light LG from the second light-emitting optical system 51G is reflected by the first optical element 155f, passes through the second optical element 155s, and is emitted from the light guide optical system 155. Thus, the light LG emitted from the light guide optical system 155 enters the second phase modulation element 54G of the phase modulation element assembly 54. That is, the light LG is guided to the second phase modulation element 54G of the phase modulation element assembly 54 by the light guide optical system 155. The light LB from the third light-emitting optical system 51B is reflected by the second optical element 155s and exits from the light guide optical system 155. The light LB thus emitted from the light guide optical system 155 enters the third phase modulation element 54B of the phase modulation element assembly 54. That is, the light LB is guided to the third phase modulating element 54B of the phase modulating element assembly 54 by the light guide optical system 155.
The first phase modulation element 54R of the phase modulation element assembly 54 diffracts the light LR incident on the first phase modulation element 54R to emit the first light DLR which is the red component of the light distribution pattern of low beam. The second phase modulation element 54G diffracts the light LG incident on the second phase modulation element 54G and emits the second light DLG, which is the green component of the near-light distribution pattern. The third phase modulating element 54B diffracts the light LB incident on the third phase modulating element 54B to emit third light DLB, which is a blue component of the low beam light distribution pattern. Thus, the lights DLR, DLG, and DLB emitted from the phase modulation element assembly 54 are irradiated to the outside of the headlamp 1 through the front cover 12. At this time, the lights DLR, DLG, and DLB are irradiated at the focal positions at predetermined distances from the vehicle so that the regions irradiated with the lights overlap with each other. The focal position is, for example, a position 25m from the vehicle. Since the light combined by these lights DLR, DLG, and DLB is a light distribution pattern of low beam, the irradiated light becomes low beam. It is preferable that the light DLR, DLG, and DLB have substantially the same outer shape of the light distribution pattern at the focal position.
Fig. 5 is a view showing a light distribution pattern for night illumination, specifically, fig. 5(a) is a view showing a light distribution pattern for low beams, and fig. 5(B) is a view showing a light distribution pattern for high beams. In fig. 5, S denotes a horizontal line, and the light distribution pattern is indicated by a thick line. The region PLA1 in the light distribution pattern PL of low beam, which is a light distribution pattern for night lighting shown in fig. 5(a), is a region with the highest intensity, and the intensity is reduced in the order of the region PLA2 and the region PLA 3. That is, the phase modulation elements 54R, 54G, and 54B of the phase modulation element assembly 54 diffract the synthesized light so that the light forms a light distribution pattern including the intensity distribution of the low beam. In fig. 5, as indicated by a broken line, light having a lower intensity than the low beam may be emitted from the headlamp 1 above the position where the low beam is emitted. The light is an optical OHS for identification. In this case, the light DLR, DLG, and DLB emitted from the respective phase modulation elements 54R, 54G, and 54B of the phase modulation element assembly 54 preferably includes the light OHS for identification. In this case, it can be understood that a light distribution pattern for night illumination is formed by using the low beam and the marker recognition light OHS. The light distribution pattern for night illumination is used not only at night but also in dark places such as tunnels.
As described above, the headlamp 1 of the present embodiment includes: light sources 52R, 52G, and 52B for emitting light; and a phase modulation element aggregate 54 including a first phase modulation element 54R, a second phase modulation element 54G, and a third phase modulation element 54B. The first phase modulation element 54R includes a plurality of modulators MPR that diffract the light LR from the first light source 52R to form a predetermined light distribution pattern. The second phase modulation element 54G has a plurality of modulation portions MPG for diffracting the light LG from the second light source 52G to form a predetermined light distribution pattern. The third phase modulation element 54B has a plurality of modulation sections MPB for diffracting the light LB from the third light source 52B to form a predetermined light distribution pattern. The first phase modulation element 54R has a width H54 in the longitudinal direction of the incident surface larger than a width WR in the lateral direction of the incident surface. The longitudinal width H54 of the incident surface of the second phase modulation element 54G is larger than the lateral width WG of the incident surface, and the longitudinal width H54 of the incident surface of the third phase modulation element 54B is larger than the lateral width WB of the incident surface. The incident point SR of the light LR of the first phase modulation element 54R has a size that can include at least one modulation unit MPR, the incident point SG of the light LG of the second phase modulation element 54G has a size that can include at least one modulation unit MPG, and the incident point SB of the light LB of the third phase modulation element 54B has a size that can include at least one modulation unit MPB. At least a part of the plurality of modulators MPR are vertically aligned, at least a part of the plurality of modulators MPG are vertically aligned, and at least a part of the plurality of modulators MPB are vertically aligned.
The amplitude of the vibration of the vehicle in the vertical direction tends to be larger than the amplitude in the horizontal direction, and the headlamp 1 vibrates similarly to the vehicle. Therefore, the incident points SR, SG, and SB of the light LR, LG, and LB of the phase modulating elements 54R, 54G, and 54B of the phase modulating element aggregate 54 tend to vibrate in the vertical direction with respect to the horizontal direction. That is, the incident points SR, SG, SB tend to vibrate in the vertical direction, which is a direction parallel to the direction projected onto the incident surface EF, in comparison with the horizontal direction, which is a direction parallel to the horizontal direction. In the headlamp 1 of the present embodiment, as described above, the width H54 in the longitudinal direction of the incident surface of each of the phase modulation elements 54R, 54G, and 54B is larger than the widths WR, WG, and WB in the lateral direction of the incident surface. Therefore, even when the incidence points SR, SG, SB vibrate in the longitudinal direction due to the vibration of the vehicle, the headlamp 1 of the present embodiment can suppress a part of the incidence points SR, SG, SB from being exposed from the incidence surfaces of the phase modulation elements 54R, 54G, 54B, and can suppress a decrease in energy efficiency. In the headlamp 1 according to the present embodiment, as described above, the size of each of the incident points SR, SG, and SB is a size that can include at least one of the modulators MPR, MPG, and MPB. At least a part of each of the modulators MPR, MPG, and MPB are arranged in the vertical direction. Therefore, in the headlamp 1 according to the present embodiment, even when the incident points SR, SG, SB move in the longitudinal direction due to vibration of the vehicle, the light LR can be incident on any of the modulators MPR, the light LG can be incident on any of the modulators MPG, and the light LB can be incident on any of the modulators MPG. Therefore, even in this case, the headlamp 1 of the present embodiment can form the light distribution pattern PL of the low beam.
The headlamp 1 of the present embodiment includes a plurality of light sources 52R, 52G, and 52B, and the phase modulation element assembly 54 includes: a first phase modulation element 54R to which the light LR from the first light source 52R is incident, a second phase modulation element 54G to which the light LG from the second light source 52G is incident, and a third phase modulation element 54B to which the light LB from the third light source 52B is incident. That is, the phase modulation elements 54R, 54G, and 54B of the phase modulation element aggregate 54 are provided for the light sources 52R, 52G, and 52B. The optical path length from the phase modulation element assembly 54 to the first light source 52R is longer than the optical path length from the phase modulation element assembly 54 to the second light source 52G, and the optical path length from the phase modulation element assembly 54 to the second light source 52G is longer than the optical path length from the phase modulation element assembly 54 to the third light source 52B. That is, the optical path length from the first phase modulation element 54R to the first light source 52R is longer than the optical path length from the second phase modulation element 54G to the second light source 52G, and the optical path length from the second phase modulation element 54G to the second light source 52G is longer than the optical path length from the third phase modulation element 54B to the third light source 52B. The width SHR in the longitudinal direction of the incident point SR of the first phase modulation element 54R is smaller than the width SHG in the longitudinal direction of the incident point SG of the second phase modulation element 54G and the width SHB in the longitudinal direction of the incident point SB of the third phase modulation element 54B. That is, the width SHR in the vertical direction of the incident point SR of the first phase modulation element 54R having the largest optical path length with respect to the corresponding light source is equal to or less than the largest width among the widths SHG and SHB in the vertical direction of the incident points SG and SB of the other phase modulation elements 54G and 54B.
The amplitude of the vibration of the incident point with respect to the phase modulation element tends to increase as the optical path length between the phase modulation element and the light source increases. In the headlamp 1 of the present embodiment, the width SHR in the longitudinal direction of the incident point SR of the first phase modulation element 54R, at which the amplitude of the vibration of the incident point with respect to the phase modulation element is likely to increase, is smaller than the width in the longitudinal direction of the incident points SG and SB of the other phase modulation elements 54G and 54B. Therefore, even if the widths of the incident surfaces of the phase modulation elements 54R, 54G, and 54B in the longitudinal direction and the optical path lengths of the phase modulation elements 54R, 54G, and 54B and the light sources 52R, 52G, and 52B are not adjusted, it is possible to suppress a part of the incident point SR of the first phase modulation element 54R, which is likely to increase in amplitude of vibration of the phase modulation element with respect to the incident point, from being exposed from the incident surface of the phase modulation element 54R. Therefore, the degree of freedom with respect to the size of the phase modulation elements 54R, 54G, and 54B and the arrangement of the phase modulation elements 54R, 54G, and 54B of the light sources 52R, 52G, and 52B can be increased.
In the headlamp 1 according to the present embodiment, the phase modulation element assembly 54 is configured such that the first phase modulation element 54R and the third phase modulation element 54B are connected to the second phase modulation element 54G, and the phase modulation elements 54R, 54G, and 54B are integrally formed. Therefore, in the headlamp 1 of the present embodiment, the number of components can be reduced as compared with the case where the phase modulation elements 54R, 54G, and 54B are provided separately.
In the headlamp 1 according to the present embodiment, the incident point SR of the first phase modulation element 54R has a substantially elliptical shape elongated in the specific direction, and the specific direction, which is the longitudinal direction of the incident point SR, is not parallel to the longitudinal direction, which is the vertical direction. Therefore, the width SHR in the vertical direction of the incident point SR can be reduced as compared with the case where the specific direction, which is the longitudinal direction of the incident point SR, is parallel to the vertical direction. Therefore, compared to the case where the specific direction, which is the longitudinal direction of the incident point SR, is parallel to the vertical direction, when the incident point SR vibrates in the vertical direction in response to the vibration of the vehicle, it is possible to suppress a part of the incident point SR from being exposed from the incident surface of the phase modulation element 54R. In addition, in order to suppress a part of the incident point SR from being exposed from the incident surface of the first phase modulation element 54R due to vibration of the vehicle, as in the present embodiment, it is preferable that the specific direction which is the longitudinal direction of the incident point SR is parallel to the horizontal direction which is the lateral direction.
In the headlamp 1 of the present embodiment, the incident point SG of the second phase modulation element 54G has a substantially elliptical shape that is long in a specific direction, and the specific direction that is the longitudinal direction of the incident point SG is not parallel to the horizontal direction that is the lateral direction. The incident point SB of the third phase modulating element 54B has a long, substantially elliptical shape that is long in a specific direction, and the specific direction that is the longitudinal direction of the incident point SB is not parallel to the horizontal direction that is the lateral direction. Therefore, as compared with the case where the specific direction, which is the longitudinal direction of the incident points SG and SB, is parallel to the horizontal direction, the width of the phase modulation elements 54G and 54B in the horizontal direction, that is, the lateral direction, can be reduced, and the manufacturing cost of the headlamp 1 can be reduced. In view of reducing the lateral widths WG and WB of the phase modulating elements 54R and 54B, it is preferable that the specific direction, which is the longitudinal direction of the incident points SG and SB, be parallel to the vertical direction, which is the vertical direction, as in the present embodiment.
In the headlamp 1 of the present embodiment, the number of the modulator MPRs arranged in the vertical direction is larger than the number of the modulator MPRs arranged in the horizontal direction. The number of modulation units MPG arranged in the vertical direction is larger than the number of modulation units MPG arranged in the horizontal direction, and the number of modulation units MPB arranged in the vertical direction is larger than the number of modulation units MPB arranged in the horizontal direction.
Therefore, compared to the case where the number of the modulation portions MPR arranged in the vertical direction is smaller than the number of the modulation portions MPR arranged in the horizontal direction, when the incident point SR vibrates in the vertical direction due to the vibration of the vehicle, the light LR from the first light source 52R is easily incident on any one of the modulation portions MPR. In addition, similarly to the modulator MPR, when the incident point SG vibrates in the longitudinal direction due to the vibration of the vehicle, the light LG from the second light source 52G is easily incident on any one of the modulators MPG. In addition, similarly to the modulator MPR, when the incident point SB is vibrated in the longitudinal direction by the vibration of the vehicle, the light LB from the third light source 52B is easily incident on any one of the modulators MPB.
(second embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to fig. 6. Note that, the same or equivalent constituent elements as those of the first embodiment are denoted by the same reference numerals and redundant description thereof is omitted unless otherwise specified.
Fig. 6 is a view showing an optical system unit according to a second embodiment of the present invention, similarly to fig. 2. In fig. 6, the radiator 30, the cover 40, and the like are not described for easy understanding. As shown in fig. 6, the optical system unit 50 of the present embodiment is different from the optical system unit 50 of the first embodiment in that the phase modulation elements 54R, 54G, and 54B are separated from each other and a combining optical system 55 is provided instead of the light guide optical system 155.
The phase modulation elements 54R, 54G, and 54B of the present embodiment are LCOS, similarly to the phase modulation elements 54R, 54G, and 54B of the first embodiment. The phase modulation element 54R is formed in a substantially rectangular shape elongated in the longitudinal direction when viewed from the front side of the incident surface EFR on which light is incident. Therefore, the width of the incident surface EFR of the first phase modulation element 54R in the longitudinal direction is larger than the width of the incident surface EFR of the first phase modulation element 54R in the lateral direction. The first phase modulation element 54R has a plurality of modulation parts MPR arranged in a matrix, and the number of modulation parts MPR arranged in the longitudinal direction of the first phase modulation element 54R is larger than the number of modulation parts MPR arranged in the lateral direction. For example, the light LR from the first light source 52R is provided in the first phase modulation element 54R, and the first phase modulation element 54R emits the first light DLR which diffracts the light LR. In the present embodiment, as in the first embodiment, since the shape of the light LR from the first light source 52R as the semiconductor laser light is not adjusted, the shape of the incident point SR of the first phase modulation element 54R is substantially elliptical. In the present embodiment, as in the first embodiment, the size of the incident point SR having a substantially elliptical shape is such that at least one modulation unit MPR can be included, and the long axis LAR of the incident point SR is substantially parallel to the horizontal direction, i.e., the lateral direction.
The second phase modulation element 54G of the present embodiment is formed in a substantially rectangular shape elongated in the longitudinal direction when viewed from the front side of the incident surface EFG on which light is incident. Therefore, the width of the incident surface EFR of the second phase modulation element 54G in the longitudinal direction is larger than the width of the incident surface EFR of the second phase modulation element 54G in the lateral direction. The second phase modulation element 54G has a plurality of modulation units MPR arranged in a matrix, and the number of modulation units MPG arranged in the vertical direction of the second phase modulation element 54G is larger than the number of modulation units MPG arranged in the horizontal direction. The light LG from the second light source 52G enters the second phase modulation element 54G, and the second phase modulation element 54G emits the second light DLG which diffracts the light LG. In the present embodiment, as in the first embodiment, since the shape of the light LG from the second light source 52G as the semiconductor laser light is not adjusted, the shape of the incident point SG of the second phase modulation element 54G is substantially elliptical. In the present embodiment, as in the first embodiment, the size of the incident point SG having a substantially elliptical shape is such that at least one modulation unit MPG can be included, and the long axis LAG of the incident point SG is substantially parallel to the vertical direction, i.e., the vertical direction.
The third phase modulating element 54B of the present embodiment is formed in a substantially rectangular shape elongated in the longitudinal direction when viewed from the front side of the incident surface EFB on which light is incident. Therefore, the width of the incidence surface EFB of the third phase modulation element 54B in the longitudinal direction is larger than the width of the incidence surface EFB of the third phase modulation element 54B in the lateral direction. The third phase modulation element 54B has a plurality of modulation sections MPB arranged in a matrix, and the number of modulation sections MPB arranged in the vertical direction of the third phase modulation element 54B is larger than the number of modulation sections MPB arranged in the horizontal direction. The light LB from the third light source 52B enters the third phase modulation element 54B, and the third phase modulation element 54B emits third light DLB that diffracts the light LB. In the present embodiment, as in the first embodiment, since the shape of the light LB from the third light source 52B as the semiconductor laser light is not adjusted, the incident point SB of the third phase modulating element 54B has a substantially elliptical shape. In the present embodiment, as in the first embodiment, the size of the incident point SB having a substantially elliptical shape is such that at least one modulation unit MPB can be included, and the major axis LAB of the incident point SB is substantially parallel to the vertical direction, i.e., the longitudinal direction.
The combining optical system 55 of the present embodiment includes a first optical element 55f and a second optical element 55 s. The first optical element 55f is an optical element that combines the first light DLR emitted from the first phase modulation element 54R and the second light DLG emitted from the second phase modulation element 54G. In the present embodiment, the first optical element 55f combines the first light DLR and the second light DLG by transmitting the first light DLR and reflecting the second light DLG. The second optical element 55s is an optical element that combines the first light DLR and the second light DLG combined by the first optical element 55f and the third light DLB emitted from the third phase modulating element 54B. In the present embodiment, the second optical element 55s transmits the first light DLR and the second light DLG combined by the first optical element 55f and reflects the third light DLB, thereby combining the first light DLR, the second light DLG, and the third light DLB. As such a first optical element 55f and a second optical element 55s, a wavelength selective filter in which an oxide film is laminated on a glass substrate can be cited. By controlling the type and thickness of the oxide film, light having a wavelength longer than a predetermined wavelength can be transmitted, and light having a wavelength shorter than the predetermined wavelength can be reflected.
In this way, the first light DLR, the second light DLG, and the third light DLB are combined in the combining optical system 55, and the combined light is emitted from the combining optical system 55. In fig. 6, the first light DLR is indicated by a solid line, the second light DLG is indicated by a broken line, and the third light DLB is indicated by a one-dot chain line, and these lights DLR, DLG, and DLB are shown as being shifted from each other.
In the present embodiment, the phase modulation elements 54R, 54G, and 54B diffract the light LR, LG, and LB from the light sources 52R, 52G, and 52B, respectively, so that the light DLR, DLG, and DLB emitted from the phase modulation elements 54R, 54G, and 54B, respectively, is synthesized by the synthesis optical system 55 and then diffracted into the light distribution pattern PL of low beam. Therefore, the first light DLR, which is the light of the red component of the light distribution pattern PL of low beam, is emitted from the first phase modulation element 54R, the second light DLG, which is the light of the green component of the light distribution pattern PL of low beam, is emitted from the second phase modulation element 54G, and the third light DLB, which is the light of the blue component of the light distribution pattern PL of low beam, is emitted from the third phase modulation element 54B.
In this way, the lights DLR, DLG, and DLB are combined in the combining optical system 55, and the combined white light is emitted from the opening 40H of the cover 40, and the light is emitted from the headlamp 1 through the front cover 12. Since this light has the light distribution pattern PL of the low beam, the irradiated light becomes the low beam.
In the headlamp 1 of the present embodiment, as in the first embodiment, even when the incident points SR, SG, SB vibrate in the longitudinal direction due to the vibration of the vehicle, it is possible to suppress a part of the incident points SR, SG, SB from being exposed from the incident surfaces EFR, EFG, EFB of the phase modulation elements 54R, 54G, 54B, and to suppress a decrease in energy efficiency. In the headlamp 1 of the present embodiment, similarly to the first embodiment, even when the incident points SR, SG, SB vibrate in the longitudinal direction due to vibration of the vehicle, the light LR can be incident on any one of the modulators MPR, the light LG can be incident on any one of the modulators MPG, and the light LB can be incident on any one of the modulators MPB. Therefore, even in such a case, the headlamp 1 of the present embodiment can form the light distribution pattern PL of low beams.
(third embodiment)
Next, a third embodiment of the present invention will be described in detail. Note that the same or equivalent constituent elements as those of the first embodiment are denoted by the same reference numerals and redundant description thereof is omitted unless otherwise specified. The optical system unit 50 of the present embodiment is different from the optical system unit 50 of the first embodiment mainly in that one phase modulation element 54S is provided instead of the phase modulation element assembly 54.
Fig. 7 is a front view of a phase modulation element according to a third embodiment of the present invention. Fig. 7 is a front view of the phase modulation element 54S as viewed from the incident surface side on which light is incident, and the phase modulation element 54S is schematically shown in fig. 7.
In the present embodiment, the phase modulation element 54S has the same configuration as the phase modulation element 54R of the first embodiment. The phase modulation element 54S of the present embodiment is formed in a substantially rectangular shape elongated in the vertical direction, i.e., the longitudinal direction, when viewed from the front side of the incident surface on which light is incident. Therefore, the width H54 in the longitudinal direction of the incident surface of the phase modulation element 54S is larger than the width WS in the lateral direction of the incident surface of the phase modulation element 54S. The phase modulation element 54S is provided with a plurality of modulation units MPS arranged in a matrix, as in the phase modulation element 54R of the first embodiment. The number of the modulation sections MPS arranged in the longitudinal direction is larger than the number of the modulation sections MPS arranged in the lateral direction. The modulator MPS includes a plurality of dots arranged in a matrix, as in the modulator MPR of the first embodiment, and diffracts and emits light incident on the modulator MPS.
In the present embodiment, the light LR, LG, and LB emitted from the light emitting optical systems 51R, 51G, and 51B is guided to the phase modulation element 54S by the light guide optical system 155 and is incident on the phase modulation element 54S, as in the first embodiment. Therefore, the incidence of these lights LR, LG, and LB on the phase modulator 54S will be described below with reference to fig. 2. In the present embodiment, the power supplied to the light sources 52R, 52G, and 52B is adjusted, laser light is alternately emitted to each of the light sources 52R, 52G, and 52B, and light LR, LG, and LB is alternately emitted to each of the light emitting optical systems 51R, 51G, and 51B. That is, when the first light-emitting optical system 51R emits light LR, the second light-emitting optical system 51G and the third light-emitting optical system 51B do not emit light LG or LB, when the second light-emitting optical system 51G emits light LG, the first light-emitting optical system 51R and the third light-emitting optical system 51B do not emit light LR or LB, and when the third light-emitting optical system 51B emits light LB, the first light-emitting optical system 51R and the second light-emitting optical system 51G do not emit light LR or LG. Emission of laser light from the light sources 52R, 52G, and 52B is sequentially switched, and emission of light LR, LG, and LB from the light emitting optical systems 51R, 51G, and 51B is sequentially switched. Therefore, the lights LR, LG, and LB having different wavelength bands from each other and emitted from the light-emitting optical systems 51R, 51G, and 51B are sequentially incident on the phase modulator 54S. The phase modulation element 54S sequentially emits the light DLR, DLG, and DLB obtained by diffracting the incident light LR, LG, and LB. In the present embodiment, similarly to the first embodiment, the optical path length from the phase modulation element 54S to the first light source 52R is longer than the optical path length from the phase modulation element 54S to the second light source 52G, and the optical path length from the phase modulation element 54S to the second light source 52G is longer than the optical path length from the phase modulation element 54S to the third light source 52B.
Fig. 7 shows an incident point SR which is a region irradiated with red light LR, an incident point SG which is a region irradiated with green light LG, and an incident point SB which is a region irradiated with blue light LB. In fig. 7, the incident point SR is indicated by a solid line, the incident point SG is indicated by a broken line, and the incident point SB is indicated by a one-dot chain line. In the present embodiment, as in the first embodiment, since the shapes of the lights LR, LG, and LB from the light sources 52R, 52G, and 52B as the semiconductor laser light are not adjusted, the incident points SR, SG, and SB of the lights LR, LG, and LB of the phase modulator 54S have a substantially elliptical shape. In the present embodiment, the sizes of the incident points SR, SG, and SB having the substantially elliptical shapes are set to sizes that can include at least one modulation unit MPS. Further, the incident points SR, SG, SB coincide with each other.
In the present embodiment, the incident point SR has a substantially elliptical shape elongated in the horizontal direction, and the longitudinal direction of the incident point SR is not parallel to the longitudinal direction. The incident point SG has a substantially elliptical shape elongated in the longitudinal direction, and the longitudinal direction of the incident point SG is not parallel to the lateral direction. Further, the incident point SB is formed in a substantially elliptical shape elongated in the longitudinal direction, and the longitudinal direction of the incident point SB is not parallel to the lateral direction. In the present embodiment, the width of incident point SR in the longitudinal direction is smaller than the width of incident point SG in the longitudinal direction, and the width of incident point SG in the longitudinal direction is substantially the same as the width of incident point SB in the longitudinal direction.
Next, the light emitted from the phase modulation element 54S of the present embodiment will be described. Specifically, a case where the headlamp 1 emits light of the light distribution pattern PL of low beam will be described as an example.
In the present embodiment, the phase modulation element 54S changes the phase modulation pattern in synchronization with the switching of the emission of the laser light from each of the light sources 52R, 52G, and 52B. Specifically, when the light LR from the light source 52R enters the phase modulation element 54S, the phase modulation pattern corresponding to the light source 52R, that is, the phase modulation pattern of the light of the red component of the light distribution pattern of the low beam is formed by the first light DLR emitted from the phase modulation element 54S. Therefore, when the light LR from the light source 52R enters, the phase modulation element 54S emits the first light DLR which is the light of the red component of the light distribution pattern of the low beam. When the light LG from the light source 52G enters, the phase modulation element 54S forms a phase modulation pattern corresponding to the light source 52G, that is, the phase modulation pattern of the green component light of the light distribution pattern of the low beam is formed by the second light DLG emitted from the phase modulation element 54S. Therefore, when the light LG from the light source 52G enters, the phase modulation element 54S emits the second light DLG, which is the green component of the light distribution pattern of the low beam. When the light LB from the light source 52B enters the phase modulation element 54S, the phase modulation pattern corresponding to the light source 52B, that is, the phase modulation pattern of the blue component light of the light distribution pattern of the low beam is formed by the third light DLB emitted from the phase modulation element 54S. Therefore, when the light LB from the light source 52B enters, the phase modulation element 54S emits the third light DLB, which is the blue component of the light distribution pattern of the low beam.
That is, the phase modulation element 54S changes the phase modulation pattern in accordance with the wavelength band of the light LR, LG, and LB thus incident, and sequentially emits the first light DLR, which is the light of the red component of the low beam, the second light DLG, which is the light of the green component of the low beam, and the third light DLB, which is the light of the blue component of the low beam. These lights DLR, DLG, and DLB are emitted from the opening 40H of the cover 40, and are sequentially irradiated to the outside of the headlamp 1 through the front cover 12. At this time, the first light DLR, the second light DLG, and the third light DLB are irradiated at the focal positions at predetermined distances from the vehicle so that the regions irradiated with the light overlap each other. The focal position is, for example, a position 25m from the vehicle. It is preferable that the first light DLR, the second light DLG, and the third light DLB are irradiated so that the outlines of the regions irradiated with the respective lights DLR, DLG, and DLB at the focal position substantially match each other. In the present embodiment, since the emission time lengths of the laser beams emitted from the light sources 52R, 52G, and 52B are substantially the same, the emission time lengths of the light beams DLR, DLG, and DLB are also substantially the same.
In addition, when lights having different colors are repeatedly irradiated at a cycle shorter than the time resolution of human vision, a human can recognize that the lights having the different colors are irradiated by synthesizing the lights due to an afterimage phenomenon. In the present embodiment, when the time for emitting the laser light again from the first light source 52R after emitting the laser light from the first light source 52R is shorter than the time resolution for human vision, the light DLR, DLG, and DLB emitted from the phase modulation element 54S is repeatedly irradiated with light at a cycle shorter than the time resolution for human vision, and the red light DLR, the green light DLG, and the blue light DLB are combined by the afterimage phenomenon. As described above, the emission time lengths of the light DLR, DLG, and DLB are substantially the same, and the intensities of the laser beams emitted from the light sources 52R, 52G, and 52B are predetermined intensities as in the first embodiment. Therefore, the color of the light synthesized by the afterimage phenomenon is the same white as the light after the light DLR, DLG, DLB synthesis of the first embodiment. Further, since the light distribution pattern of the light after the light DLR, DLG, and DLB is synthesized is the light distribution pattern PL of the low beam, the light distribution pattern of the light after the light DLR, DLG, and DLB is synthesized by the afterimage phenomenon also becomes the light distribution pattern PL of the low beam. Thus, the light of the light distribution pattern PL of the low beam is emitted from the headlamp 1.
The cycle of repeatedly emitting laser light from the light sources 52R, 52G, and 52B is preferably 1/15s or less from the viewpoint of suppressing the perception of flicker of light synthesized by the afterimage phenomenon. The temporal resolution of human vision is approximately 1/30 s. In a vehicle lamp, when the light emission cycle is about 2 times, the flicker of the sensed light can be suppressed. When the period is 1/30s or less, the time resolution of human vision is substantially exceeded. Therefore, the flicker of the sensed light can be further suppressed. In addition, from the viewpoint of further suppressing the flicker of the sensed light, the period is preferably 1/60s or less.
In the present embodiment, as described above, the width H54 in the longitudinal direction of the incident surface of the phase modulation element 54S is larger than the width WS in the lateral direction of the incident surface. The incident points SR, SG, SB of the phase modulation element 54S have a size that can include at least one modulation unit MPS, and at least some of the plurality of modulation units MPS are arranged in the longitudinal direction. Therefore, in the headlamp 1 of the present embodiment, as in the first embodiment, even when the incident points SR, SG, SB move in the longitudinal direction due to vibration of the vehicle, the light distribution pattern PL of the low beam can be formed.
In the present embodiment, as described above, the width in the vertical direction of the incident point SR having the largest optical path length of the corresponding light source is equal to or less than the largest width in the vertical direction of the other incident points SG and SB. Therefore, in the headlamp 1 of the present embodiment, similarly to the first embodiment, without adjusting the width H54 in the longitudinal direction of the incident surface of the phase modulation element 54S and the optical path lengths of the phase modulation element 54S and the light sources 52R, 52G, and 52B, it is possible to suppress a part of the incident point SR, which is likely to increase in amplitude of vibration of the phase modulation element 54S, from being exposed from the incident surface of the phase modulation element 54S.
In the present embodiment, the incident point SR has a substantially elliptical shape having a long length in a specific direction, and the specific direction which is the longitudinal direction of the incident point SR is not parallel to the vertical direction which is the vertical direction. Therefore, in the headlamp 1 of the present embodiment, as in the first embodiment, when the incident point SR vibrates in the vertical direction due to the vibration of the vehicle, it is possible to suppress a part of the incident point SR from being exposed from the incident surface of the phase modulation element 54R, as compared with the case where the specific direction, which is the longitudinal direction of the incident point SR, is parallel to the vertical direction.
In the present embodiment, the number of the modulation sections MPS arranged in the longitudinal direction is larger than the number of the modulation sections MPS arranged in the lateral direction. Therefore, as in the first embodiment, when the incident points SR, SG, SB vibrate in the longitudinal direction due to the vibration of the vehicle, the lights LR, LG, LB from the light sources 52R, 52G, 52B are more likely to be incident on any of the modulation sections MPG, as compared with the case where the number of the modulation sections MPS arranged in the longitudinal direction is smaller than the number of the modulation sections MPS arranged in the lateral direction.
In the headlamp 1 according to the present embodiment, since the phase modulation elements diffracted by the light LR, LG, and LB from the three light sources 52R, 52G, and 52B are common phase modulation elements, the number of components can be reduced, and the size can be reduced.
The present invention has been described above by taking the above embodiments as examples, but the present invention is not limited thereto.
The utility model discloses a lamp for vehicle has: the phase modulation element includes a light source and a plurality of modulation units for diffracting light from the light source to form a predetermined light distribution pattern, a width of an incident surface of the phase modulation element in a longitudinal direction on which the light is incident is larger than a width of the incident surface in a transverse direction, and a size of an incident point of the light on the phase modulation element is a size capable of including at least one modulation unit. In the vehicle lamp having such a configuration, even when the incident point is vibrated in the longitudinal direction by the vibration of the vehicle, a part of the incident point can be suppressed from being exposed from the incident surface of the phase modulation element, and the energy efficiency can be suppressed from being lowered. In addition, even when the incident point is vibrated in the longitudinal direction by the vibration of the vehicle, the light can be incident on any of the modulation sections, and therefore, a predetermined light distribution pattern can be formed.
In the above embodiment, the headlight 1 serving as the vehicle lamp irradiates a low beam, but the present invention is not particularly limited thereto. For example, the vehicle lamp may emit high beam or light constituting an image. When the vehicle lamp is irradiated with high beam, light of a light distribution pattern PH of high beam, which is a light distribution pattern for night illumination shown in fig. 5(B), is irradiated. In the distribution pattern PH of high beam shown in fig. 5(B), the region PHA1 is the region with the highest intensity, and the region PHA2 is the region with lower intensity than the region PHA 1. That is, the phase modulation elements 54R, 54G, and 54B of the phase modulation element assembly 54 according to the first embodiment diffract light so that the combined light forms a light distribution pattern including the intensity distribution of the high beam. The phase modulation elements 54R, 54G, and 54B according to the second embodiment diffract light so that the combined light forms a light distribution pattern including the intensity distribution of the high beam. The phase modulation element 54S according to the third embodiment diffracts light so that the light synthesized by the afterimage phenomenon forms a light distribution pattern including the intensity distribution of the high beam. In addition, when the vehicle lamp irradiates light constituting an image, the direction of light emitted from the vehicle lamp and the position where the vehicle lamp is mounted on the vehicle are not particularly limited.
In the above embodiment, the phase modulation elements 54R, 54G, 54B, and 54S are reflective phase modulation elements. However, as the phase modulation element, for example, an lcd (liquid crystal display) which is a liquid crystal panel, a glv (grating Light valve) in which a plurality of reflectors are formed on a silicon substrate, a diffraction grating, or the like may be used. The LCD is a transmissive phase modulation element. In this LCD, similarly to the LCOS which is the reflective liquid crystal panel, the voltage applied between the pair of electrodes sandwiching the liquid crystal layer is controlled at each point, and the amount of change in the phase of light emitted from each point is adjusted, whereby the light distribution pattern of the emitted light can be made to be a desired light distribution pattern. Further, the pair of electrodes is not a transparent electrode. GLV is a reflective phase modulation element. The GLV diffracts incident light to emit the light and makes a light distribution pattern of the emitted light a desired light distribution pattern by electrically controlling the deflection of the reflector.
In the first embodiment, the first phase modulation element 54R, the second phase modulation element 54G, and the third phase modulation element 54B of the phase modulation element assembly 54 are arranged adjacent to each other in the lateral direction. However, the phase modulation elements 54R, 54G, and 54B may be arranged in the longitudinal direction, or may be arranged in the longitudinal direction and the lateral direction.
In the first and third embodiments, the light guide optical system 155 includes the reflecting mirror 155m, the first optical element 155f, and the second optical element 155 s. However, the light guide optical system 155 is not limited to the configurations of the first and third embodiments described above, as long as it guides the light LR, LG, and LB emitted from the light emitting optical systems 51R, 51G, and 51B to the phase modulation element aggregate 54 and the phase modulation element 54S. For example, the light guide optical system 155 may not have the reflecting mirror 155 m. In this case, the light LR emitted from the first light-emitting optical system 51R enters the first optical element 155 f. In the first and third embodiments, band pass filters that transmit light in a predetermined wavelength range and reflect light in other wavelength ranges may be used for the first and second optical elements 155f and 155 s.
In the first and third embodiments, the optical system unit 50 includes the light guide optical system 155 for guiding the light LR, LG, and LB emitted from the light emitting optical systems 51R, 51G, and 51B to the phase modulation element aggregate 54 and the phase modulation element 54S. However, the optical system unit 50 may not have the light guide optical system 155. In this case, the light emitting optical systems 51R, 51G, and 51B are arranged so that the light LR, LG, and LB enters the phase modulation element aggregate 54 and the phase modulation element 54S.
In the second embodiment, the first optical element 55f transmits the first light DLR and reflects the second light DLG to combine the first light DLR and the second light DLG, and the second optical element 55s transmits the first light DLR and the second light DLG combined by the first optical element 55f and reflects the third light DLB to combine the first light DLR, the second light DLG, and the third light DLB. However, for example, the third light DLB and the second light DLG may be combined in the first optical element 55f, and the third light DLB and the second light DLG combined in the first optical element 55f may be combined with the first light DLR in the second optical element 55 s. In this case, in the second embodiment, the positions of the first light source 52R, the first collimating lens 53R, the first phase modulation element 54R, the third light source 52B, the third collimating lens 53B, and the third phase modulation element 54B may be replaced. In the second embodiment, a band-pass filter that transmits light in a predetermined wavelength band and reflects light in other wavelength bands may be used for the first optical element 55f and the second optical element 55 s. In the second embodiment, the combining optical system 55 may combine the lights DLR, DLG, and DLB emitted from the phase modulation elements 54R, 54G, and 54B, and is not limited to the configuration of the second embodiment and the configuration described above.
In the second embodiment, the optical system unit 50 includes the combining optical system 55 that combines the first light DLR, the second light DLG, and the third light DLB. However, the optical system unit 50 may not have the synthesizing optical system 55. In this case, as in the first embodiment, the phase modulation elements 54R, 54G, and 54B diffract the incident light LR, LG, and LB so that the light DLR, DLG, and DLB emitted from the phase modulation elements 54R, 54G, and 54B are combined.
In the first embodiment, the optical system unit 50 does not include a synthesis optical system for synthesizing the first light DLR, the second light DLG, and the third light DLB. However, the optical system unit 50 of the first embodiment may have a combining optical system, as in the second embodiment.
In the second embodiment, the optical system unit 50 does not include a light guide optical system for guiding the light LR, LG, and LB emitted from the light emitting optical systems 51R, 51G, and 51B to the phase modulation elements 54R, 54G, and 54B. However, the optical system unit 50 of the second embodiment may have a light guide optical system as in the first embodiment.
In addition, in the above embodiment, the lamp unit 20 does not have an imaging lens system including an imaging lens. However, the lamp unit 20 may have an imaging lens system through which light emitted from the optical system unit 50 is emitted. With such a configuration, a light distribution pattern wider than the light distribution pattern of the emitted light can be easily obtained. The width here indicates a width greater than that of a light distribution pattern formed on a vertical plane at a predetermined distance from the vehicle.
In the above embodiment, the incident points SR, SG, and SB have a substantially elliptical shape. However, the shapes of the incident points SR, SG, and SB are not particularly limited, and may be circular, for example.
In the above embodiment, the phase modulation elements 54R, 54G, 54B, and 54S are each substantially rectangular in shape, and the incident surfaces are also substantially rectangular. However, the incident surface of the phase modulation elements 54R, 54G, 54B, and 54S may have a shape in which the width in the vertical direction is larger than the width in the horizontal direction.
In the first embodiment, all of the three phase modulation elements 54R, 54G, and 54B are integrally formed. However, from the viewpoint of reducing the number of components, at least one phase modulation element of the plurality of phase modulation elements may be connected to at least one other phase modulation element and formed integrally with the other phase modulation element.
In the third embodiment, among the three light sources 52R, 52G, and 52B, the light sources 52R, 52G, and 52B emit light alternately. However, in view of reduction in the number of components and miniaturization, at least two light sources may be arranged so that light is emitted alternately for each of the light sources. In this case, the light emitted from the phase modulation element into which the light emitted from at least two light sources is incident is synthesized by an afterimage phenomenon, and the light synthesized by the afterimage phenomenon is synthesized with the light emitted from another phase modulation element to irradiate the light of a predetermined light distribution pattern.
In the first embodiment, the optical system unit 50 having the single phase modulation element assembly 54 in which the three light sources 52R, 52G, and 52B that emit laser beams in wavelength bands different from each other and the three phase modulation elements 54R, 54G, and 54B are integrated has been described as an example. In the second embodiment, the optical system unit 50 including the three light sources 52R, 52G, and 52B that emit laser beams in wavelength bands different from each other and the three phase modulation elements 54R, 54G, and 54B corresponding to the light sources 52R, 52G, and 52B in a one-to-one manner is described as an example. In the third embodiment, the optical system unit 50 including the three light sources 52R, 52G, and 52B that emit laser beams in wavelength bands different from each other and the single phase modulation element 54S is described as an example. However, the optical system unit may have at least one light source and a phase modulation element corresponding to the light source. For example, the optical system unit may include a light source that emits white laser light, and a phase modulation element that diffracts and emits the white laser light emitted from the light source. In the case where the optical system unit includes a plurality of light sources and phase modulation elements, each phase modulation element may correspond to at least one light source. For example, the light beams combined from the light sources may be made incident on one phase modulation element.
Industrial applicability
Utilize the utility model discloses, provide a can enough restrain the reduction of energy efficiency, can form the vehicle lamps and lanterns of specified grading pattern again, can use in the field of vehicle lamps and lanterns such as car.
Claims (6)
1. A lamp for a vehicle, characterized by comprising:
a light source that emits light;
a phase modulation element having a plurality of modulation units that diffract the light from the light source to form a predetermined light distribution pattern;
the width of the incident surface of the phase modulation element on which the light is incident in the vertical direction is larger than the width of the incident surface in the horizontal direction,
the size of the incident point of the light of the phase modulation element is a size capable of containing at least one of the modulation sections,
at least a part of the plurality of modulation units are arranged in the vertical direction.
2. A lamp for a vehicle as defined in claim 1,
the point of incidence is in the shape of a long strip that is long in a particular direction compared to other directions,
the specific direction is not parallel to the horizontal direction.
3. A lamp for a vehicle as defined in claim 1,
the point of incidence is in the shape of a long strip that is long in a particular direction compared to other directions,
the specific direction is not parallel to the vertical direction.
4. A lamp for a vehicle as claimed in any one of claims 1 to 3,
the plurality of modulation units are arranged in the vertical direction and the horizontal direction, and the number of modulation units arranged in the vertical direction is larger than the number of modulation units arranged in the horizontal direction.
5. A lamp for a vehicle as claimed in any one of claims 1 to 3,
a plurality of said light sources are provided,
said phase modulating element being disposed on said each of a plurality of said light sources,
the width in the vertical direction of the incident point of the phase modulation element having the largest optical path length of the corresponding light source among the plurality of phase modulation elements is equal to or less than the largest width among the widths in the vertical direction of the incident points of the other phase modulation elements.
6. A lamp for a vehicle as claimed in any one of claims 1 to 3,
a plurality of said light sources are provided,
said phase modulating element being disposed on said each of a plurality of said light sources,
at least one of the phase modulation elements is connected to at least one other of the phase modulation elements and is formed integrally with the other phase modulation element.
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| JP2018196849 | 2018-10-18 | ||
| JP2018-196849 | 2018-10-18 |
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| CN210801006U true CN210801006U (en) | 2020-06-19 |
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| CN201921588518.6U Active CN210801006U (en) | 2018-10-18 | 2019-09-23 | Vehicle lamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110953542A (en) * | 2018-09-26 | 2020-04-03 | 株式会社小糸制作所 | Vehicle lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110953542A (en) * | 2018-09-26 | 2020-04-03 | 株式会社小糸制作所 | Vehicle lamp |
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