WO2018084269A1 - Vehicle lamp - Google Patents

Abstract

A vehicle lamp provided with a lamp unit capable of forming both a low-beam light distribution pattern and a high-beam light distribution pattern. In order to provide a vehicle lamp with reduced light distribution loss, the vehicle lamp of the present invention is provided with: a first light emitting chip for low-beam; a plurality of second light emitting chips for high-beam arranged in a horizontal direction; a lens which directs light from the first light emitting chip and the second light emitting chips forward; a reflector which reflects light from the first light emitting chip toward the lens; and a shade which blocks part of the light reflected by the reflector. The lens is provided with an upper incident plane on the vertically upper side of a fundamental optical axis passing a rear fundamental focal point of the lens, and a lower incident plane on the vertically lower side of the basic optical axis. The upper incident plane has a shape with an increasing radius of curvature from the basic optical axis side toward the outer edge of the upper incident plane. The lower incident plane has a shape with an increasing radius of curvature from the center in the horizontal direction toward the outside in the horizontal direction, and with a linear vertical cross section.

Description

Vehicle lighting

The present invention relates to a vehicular lamp.

Patent Document 1 discloses a vehicular lamp including a lamp unit that can form both a low beam light distribution pattern and a high beam light distribution pattern, and the high beam light distribution pattern uses a plurality of light emitting chips. A vehicular lamp that can perform variable high beam (Adaptive Driving Beam) control that changes a light distribution pattern according to the position of a preceding vehicle or an oncoming vehicle is disclosed.

JP 2016-39020 A

By the way, in the case of such a configuration in which a large number of light emitting chips are arranged side by side, the light emitting chip is also present at a position away from the lens focal point of the projection lens, and light emission located outside thereof due to off-axis aberrations. Although the light distribution pattern by the light from the chip may be lost, the vehicle lamp disclosed in Patent Document 1 does not consider the problem of this off-axis aberration.

The present invention has been made in view of such circumstances, and is a vehicular lamp including a lamp unit that can form both a low beam light distribution pattern and a high beam light distribution pattern. An object is to provide a suppressed vehicular lamp.

The present invention is grasped by the following composition in order to achieve the above-mentioned object.
(1) A vehicular lamp according to the present invention includes a first light emitting chip for low beam light distribution, a plurality of second light emitting chips arranged in a horizontal direction for high beam light distribution, the first light emitting chip and the second light emitting chip. A lens that irradiates the light from the front side, a reflector that reflects the light from the first light emitting chip toward the lens, and a shade that blocks a part of the light reflected by the reflector, and the lens Comprises an upper incident surface vertically above the basic optical axis passing through the rear basic focal point of the lens, and a lower incident surface vertically lower than the basic optical axis, and the upper incident surface is the basic incident surface. It has a shape in which the radius of curvature increases from the optical axis side toward the outer edge of the upper incident surface, and the lower incident surface increases in radius of curvature from the horizontal center to the horizontal outer side. In addition, the vertical section is straight It has a shape which is Jo.

(2) In the configuration of (1) above, the second light emitting chip is disposed vertically below the rear basic focus of the lens in the vertical direction, and the second light emitting chip passes through the light emission center. The light emitting surface is disposed so as to be inclined upward in the vertical direction so that the light emitting optical axis intersects the upper incident surface.

(3) In the configuration of (1) or (2), the first reflecting unit that reflects a part of light emitted from the second light emitting chip toward the lower incident surface upward in the vertical direction; A second reflecting portion that reflects a part of light emitted upward from the second light emitting chip in the vertical direction downward.

(4) In the configuration of (3) above, the first reflecting portion is incident on the lower incident surface directly from the second light emitting chip toward the lower incident surface. Light is reflected so that the amount of light is 1/3 to 6/7.

(5) In any one of the constitutions (1) to (4), the light source includes a light diffusion structure that is formed on the lower incident surface and the upper incident surface and scatters light incident on the lens, The light diffusion structure formed on the center side in the horizontal direction of the incident surface is set to have a larger amount of light scattering than the light diffusion structure formed on the lower incident surface.

(6) The vehicular lamp according to the present invention includes a first light emitting chip for low beam distribution, a plurality of second light emitting chips arranged in a horizontal direction for high beam distribution, the first light emitting chip and the second light emitting chip. A lens that irradiates the light from the front side, a reflector that reflects the light from the first light emitting chip toward the lens, and a shade that blocks a part of the light reflected by the reflector, and the lens Includes an upper incident surface vertically above the basic optical axis passing through the rear basic focal point of the lens, and a lower incident surface vertically lower than the basic optical axis, and passes through the rear basic focal point of the lens. In a vertical section along the basic optical axis, the upper end portion of the upper incident surface is located on the front side of the lower end portion of the lower incident surface.

ADVANTAGE OF THE INVENTION According to this invention, it is a vehicle lamp provided with the lamp unit which can form both a low beam light distribution pattern and a high beam light distribution pattern, Comprising: The vehicle lamp which suppressed light distribution collapse can be provided. .

It is a top view of vehicles provided with a vehicular lamp of an embodiment concerning the present invention. It is the top view which looked at the lamp unit of embodiment which concerns on this invention from the front side. It is sectional drawing of the lamp unit of embodiment which concerns on this invention. It is a figure for demonstrating the shape of the entrance plane of the lens of embodiment which concerns on this invention, (a) is sectional drawing of the perpendicular direction along the basic optical axis which passes along the back fundamental focus of a lens, (b) FIG. 3 is a horizontal sectional view along a basic optical axis passing through a rear basic focal point of a lens. It is a figure explaining the design method of the entrance plane for suppressing the light distribution collapse by an off-axis aberration. It is a figure which shows the case where the light distribution pattern on a screen isolate | separates to a perpendicular direction. It is a figure for demonstrating the shape of the output surface of the lens of embodiment which concerns on this invention, (a) is the figure which looked at the lens from the back side, (b) is the fundamental light which passes the back fundamental focus of a lens. It is a vertical sectional view along an axis. It is a figure which shows the light distribution pattern on the screen formed in the state before providing the 1st reflection part and 2nd reflection part of embodiment which concerns on this invention, (a) is the light irradiated from the upper output surface (B) is a figure which shows the light distribution pattern formed by the light irradiated from the lower output surface, (c) is (a) and (b) It is a figure which shows the light distribution pattern which the light from the 2nd light emitting chip on which the light distribution pattern of FIG. It is a figure for demonstrating the light-diffusion structure formed in the entrance plane of embodiment which concerns on this invention. It is a figure which shows the light distribution pattern on the screen of the vehicle lamp of embodiment which concerns on this invention, (a) is a light distribution pattern formed with the light irradiated from an upper output surface, (b) is (C) is a light distribution pattern formed by light from the second light emitting chip in which the light distribution patterns of (a) and (b) are multiplexed. FIG. FIG. 3 is a diagram showing a light distribution pattern formed by light from a second light emitting chip disposed at a position farthest to the left (vehicle inside) from a vertical axis (Y axis) passing through the rear basic focal point of the lens in FIG. 2. is there.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings.
Note that the same number is assigned to the same element throughout the description of the embodiment.
In the embodiments and drawings, “front” and “rear” indicate “forward direction” and “reverse direction” of the vehicle, respectively, and “up”, “down”, “left” unless otherwise specified. "And" Right "respectively indicate directions viewed from the driver who gets on the vehicle.

The vehicular lamp according to the embodiment of the present invention is a vehicular headlamp (101R, 101L) provided on each of the left and right sides of the front of the vehicle 102 shown in FIG. 1, and is simply referred to as a vehicular lamp.
The vehicular lamp according to the present embodiment includes a housing (not shown) that opens to the front side of the vehicle and an outer lens (not shown) that is attached to the housing so as to cover the opening, and is formed by the housing and the outer lens. A lamp unit 10 (see FIG. 2) and the like are disposed in the lamp chamber.
In the following description of the lamp unit 10, the description will be given mainly using the vehicle lamp on the right side of the vehicle as an example, but the parts not specifically mentioned are common to the left and right vehicle lamps.

(Lamp unit 10)
FIG. 2 is a plan view of the lamp unit 10 as viewed from the front side, and FIG. 3 is a cross-sectional view of the lamp unit 10.
In FIG. 2, the lens 50 is omitted and the inside is shown. FIG. 3 is a vertical sectional view along the basic optical axis (see Z axis) passing through the rear basic focal point O of the lens 50.

As shown in FIG. 3, the lamp unit 10 includes a heat sink 20, a first light source 25, a reflector 30, a shade 31, a mounting member 40, a second light source 43, a power supply connector 44, a lens 50, The first reflection part 61 and the second reflection part 62 are mainly provided.

(Heat sink 20)
The heat sink 20 includes a base portion 21 and a plurality of radiating fins 22 integrally formed on the lower side of the base portion 21 and extending downward in the vertical direction.
A mounting portion 26 for mounting the first light source 25 is formed on the upper surface of the base portion 21 in the vertical direction, and the first light source 25 is attached by a holder 27.

The heat sink 20 is preferably formed of a metal or a resin having a high thermal conductivity in order to efficiently dissipate the heat generated by the first light source 25. In the present embodiment, the heat sink 20 made of aluminum die casting is used. Yes.

(First light source 25)
The first light source 25 is a light source that emits light for forming a low beam light distribution pattern. The first light source 25 is arranged so as to emit light upward in the vertical direction. And a first light emitting chip 24 provided on the substrate 23.

In this embodiment, the LED chip which is a semiconductor light emitting element is used for the first light emitting chip 24. However, the first light emitting chip 24 is not limited to the LED chip. For example, the semiconductor light emitting element is a semiconductor light emitting element. A certain LD chip (laser diode chip) may be used.

(Reflector 30)
The reflector 30 is a member that reflects light radiated upward in the vertical direction from the first light emitting chip 24 toward the lens 50, and the reflecting surface 30 a of the reflector 30 is opened to the front side so that the first light emitting chip 24 opens. It is attached to the base portion 21 of the heat sink 20 so as to cover the top in a semi-dome shape.

(Shade 31)
As shown in FIG. 3, the shade 31 is disposed between the first light source 25 and the lens 50, blocks a part of the light reflected by the reflector 30 toward the lens 50, and cuts off a low beam light distribution pattern. It is a member which forms.

More specifically, as shown in FIG. 2, the edge 31 a on the front side of the shade 31 has a shape matched to the cut-off line, and the rear basic focal point O of the lens 50 is the edge on the front side of the shade 31. The shade 31 is disposed so as to be positioned in the vicinity of the portion forming the upper end portion of the oblique cut-off line 31a.
Specifically, as shown in FIG. 3, the shade 31 is arranged so that the rear basic focal point O of the lens 50 is positioned about 1.0 mm behind the front edge 31 a of the shade 31.

(Mounting member 40)
The attachment member 40 is a member to which the shade 31, the second light source 43, the power supply connector 44, the first reflection portion 61, and the second reflection portion 62, which will be described later, are attached.

In the present embodiment, the attachment member 40 is formed as a separate member from the heat sink 20, and the attachment member 40 is fixed to the heat sink 20. However, the attachment member 40 is not necessarily configured as a separate member from the heat sink 20. Alternatively, a structure corresponding to the mounting member 40 may be formed integrally.

As shown in FIG. 3, in the mounting member 40, the first surface 40 a located on the front side is a surface on which the second light source 43 is arranged. The reason will be described later, but the rear basic focal point O of the lens 50 is set. The first surface 40a is formed so as to face obliquely upward in the vertical direction at an angle θ1 with respect to the passing vertical axis (see the Y axis).
In the present embodiment, the first surface 40a is a surface inclined obliquely upward in the vertical direction so that the angle θ1 is about 25 °.

(Second light source 43)
The second light source 43 is a light source that emits light for forming a high-beam light distribution pattern. As shown in FIG. 3, the second light source 43 includes a second substrate 41 disposed on the first surface 40 a of the mounting member 40, And a plurality of second light emitting chips 42 (see FIG. 2) provided on the two substrates 41 so as to be arranged in the horizontal direction.

In the present embodiment, the second light emitting chip 42 also uses an LED chip that is a semiconductor light emitting element, as with the first light emitting chip 24. However, the second light emitting chip 42 is not limited to the LED chip. It may be an LD chip (laser diode chip) which is a light emitting element.

In the present embodiment, as shown in FIG. 2, the four on the vehicle outer side (the left side in the figure) on the basis of the vertical axis (see the Y axis) passing through the rear basic focal point O of the lens 50 when viewed from the front side of the vehicle. The second light emitting chip 42 is provided, seven second light emitting chips 42 are provided on the vehicle inner side (right side in the figure), and eleven second light emitting chips 42 are provided so as to be arranged in the horizontal direction. The number of the second light emitting chips 42 may be increased or decreased according to the horizontal light distribution range required for the high beam light distribution pattern to be formed.

In the case of the vehicular lamp on the left side of the vehicle, in the front view as seen from the front side of the vehicle shown in FIG. 2, the horizontal left and right directions are based on the vertical axis (see the Y axis) passing through the rear basic focal point O of the lens 50. What is necessary is just to arrange | position so that arrangement | positioning of the 2nd light emitting chip 42 may be reversed.
However, since the relationship between the inside and outside of the vehicle is reversed between the vehicle left side and the vehicle right side, the arrangement state of the second light emitting chip 42 will be described with reference to the vehicle inner side and the vehicle outer side as described above. Four second light emitting chips 42 are provided on the vehicle outer side (left side in the figure) on the basis of a vertical axis passing through the focal point O (see the Y axis), and seven second light emitting chips 42 are provided on the vehicle inner side (right side in the figure). It will be provided.

Further, in the present embodiment, specifically, with respect to the two second light emitting chips 42 on the innermost side (right side in the figure), the arrangement pitch in the horizontal direction is different from the remaining nine second light emitting chips 42. However, the pitch between the second light emitting chips 42 in the horizontal direction is set so that the light distribution pattern formed by the light from the adjacent second light emitting chips 42 is appropriately adjusted on the screen. What is necessary is just to set so that it may overlap.

Furthermore, in this embodiment, although the 2nd light source 43 has shown about the case where the some 2nd light emitting chip 42 is provided on the 2nd board | substrate 41 which is one common board | substrate, every 2nd light emitting chip 42 is shown. It may be configured as a second light source unit having a plurality of light sources by providing a substrate.

And in the lamp unit 10 of this embodiment, it controls so that generation | occurrence | production of the glare light with respect to a preceding vehicle or an oncoming vehicle may be controlled by controlling turning on / off of the 2nd light emission chip | tip 42 according to the position of a preceding vehicle or an oncoming vehicle. In addition, variable high beam (Adaptive Driving Beam) control for changing the high beam light distribution pattern can be performed.

(Power supply connector 44)
The power supply connector 44 is a connector to which an external connector for supplying power is connected. As shown in FIG. 3, the power supply connector 44 is provided on the second substrate 41 and is connected to the second light emitting chip 42 formed on the second substrate 41. The conductive pattern is electrically connected.

(Lens 50)
The lens 50 is formed of glass, resin, or the like, and is a member that irradiates light from the first light emitting chip 24 and the second light emitting chip 42 while controlling light distribution so as to form a predetermined light distribution pattern on the front side. It is attached to the heat sink 20 via the lens holder 50a.
A specific configuration for light distribution control in the lens 50 will be described later.

The material for forming the lens 50 is not particularly limited, but the lens 50 is preferably formed of a resin from the viewpoint of good moldability.
For example, from the viewpoint of easily suppressing the occurrence of blue spectral colors, an acrylic resin having a small refractive index wavelength dependency is preferable.

On the other hand, when the ADB control is performed, the number of second light emitting chips 42 is increased, and thus the lens 50 may be required to have heat resistance.
In such a case, a polycarbonate resin having excellent heat resistance may be used.

(1st reflection part 61)
The first reflecting portion 61 is a member that reflects a part of light emitted from each second light emitting chip 42 toward the lower side in the vertical direction, and is attached to the attachment member 40.
Although the reason will be described later, in this embodiment, the angle θ2 radiates downward in the vertical direction at an angle larger than about 17 ° with respect to the basic optical axis (see the Z axis) passing through the rear basic focal point O of the lens 50. The light to be reflected is reflected.

(Second reflection part 62)
The second reflection unit 62 is a member that reflects a part of light emitted from each second light emitting chip 42 toward the upper side in the vertical direction.
The second reflecting portion 62 is provided below the shade 31 in the vertical direction, and is attached to the attachment member 40 together with the shade 31.
In the present embodiment, the second reflecting portion 62 is disposed so that the reflecting surface of the second reflecting portion 62 is substantially parallel to the light emission optical axis OZ passing through the light emission center of the second light emitting chip 42.

Next, it explains in detail, explaining the composition relevant to light distribution control.
FIG. 4 is a diagram for explaining the shape of the incident surface 51 of the lens 50. FIG. 4A is a vertical cross section along the basic optical axis (see the Z axis) passing through the rear basic focal point O of the lens 50. FIG. 4B is a horizontal sectional view along the basic optical axis (see Z axis) passing through the rear basic focal point O of the lens 50.

FIG. 5 is a diagram for explaining a method of designing an incident surface for suppressing the collapse of light distribution due to off-axis aberrations.
The lens L shown in FIG. 5 is a horizontal sectional view of a lens having a basic shape for forming the lens 50.

FIG. 5 shows an example of a state in which light rays parallel to the optical axis P of the lens L are incident on the lens L from one surface S1 and are emitted from the other surface S2, and are incident on the one surface S1. An extension line of the previous light beam and an extension line of the light beam after exiting from the other surface S2 are indicated by a one-dot chain line, and a point where the extension lines intersect (refer to a point where the one-dot chain line intersects) is a point D.

Then, when the incident position of the light beam incident on one surface S1 is changed along one surface S1 and the point D is obtained in the same manner as described above, the locus of the point D is as indicated by a dotted line, The locus indicated by the dotted line is the main surface SML of the lens L.
A point where the optical axis P of the lens L intersects with the principal surface SML is a principal point SP of the lens L.

Since the off-axis aberration is eliminated when the main surface SML is a perfect circle (Apollon circle) centered on the basic focus BF, the basic focus of the lens L can be suppressed in order to suppress the off-axis aberration of the lens L. The other surface S2 may be formed so that the distance K between BF and the point D is constant at the focal length F.

Here, when the sine condition violation amount OSC = K−F is defined as an evaluation amount representing the degree of off-axis aberration, when the sine condition violation amount OSC is obtained along the main surface SML, those values are zero. The closer to is, the more off-axis aberration is suppressed.
Since K = W / sin θ ′ can be expressed, the sine condition violation amount OSC can be described as the sine condition violation amount OSC = W / sin θ′−F.

When the shape of the incident surface is determined so that the sine condition violation amount OSC becomes small, the basic optical axis (see Z axis) passing through the rear basic focal point O (see FIG. 3) of the lens 50 intersects with the incident surface 51. A shape in which the radius of curvature continuously increases in the radial direction (that is, in the direction of the outer peripheral edge of the lens 50) with reference to M (see FIG. 4).

On the other hand, the lens 50 of the present embodiment is obtained based on the sine condition violation amount OSC in consideration of performing the light distribution control for the low beam light distribution pattern and the light distribution control for the high beam light distribution pattern. The shape is a basic shape with some modifications.

Specifically, as shown in FIG. 4A, the lens 50 has a basic optical axis (see Z axis) passing through the rear basic focal point O (see FIG. 3) of the lens 50 as an incident surface 51 on which light is incident. To the upper side incident surface 52 on the upper side in the vertical direction and the lower side incident surface 53 on the lower side in the vertical direction from the basic optical axis (see Z-axis). The curvature radius increases from the basic optical axis (see Z axis) side toward the outer edge of the upper incident surface 52.

For this reason, when viewed in the cross section shown in FIG. 4A, the upper incident surface 52 having a curved shape projecting toward the rear side is a point M (where the basic optical axis (see Z axis) and the incident surface 51 intersect. 4), the radius of curvature Rvc is about 150 mm, the radius of curvature continuously increases toward the upper side in the vertical direction, and the radius of curvature Rvt becomes about 300 mm on the outer edge side of the upper incident surface 52. It has become.
On the other hand, when viewed from the cross section (vertical cross section) shown in FIG. 4A, with respect to the lower incident surface 53, the lower end of the lower incident surface 53 from the point M in order to suppress the influence on the low beam light distribution pattern. It is linear until it reaches (lower end Rvb).
Needless to say, if the radius of curvature approaches infinity, the curve having a sufficiently large radius of curvature is linear, as is apparent from the fact that the curve approaches a straight line as much as possible.

For example, in the present embodiment, since the diameter of the lens 50 is about 68 mm, when viewed in a vertical section along the basic optical axis (see Z axis) passing through the rear basic focal point O (see FIG. 3) of the lens 50. The vertical width of the lower incident surface 53 is about 34 mm. Even if the lower incident surface 53 is a curved surface protruding rearward, the vertical cross section along the basic optical axis (see Z-axis). When the radius of curvature of the lower incident surface 53 is sufficiently larger than the width of the lower incident surface 53 (for example, when the radius of curvature is 20 times or more the vertical width of the lower incident surface 53), That is, if the lower incident surface 53 is a sufficiently gentle curved surface having a constant radius of curvature of about 1000 mm, the lower incident surface 53 can be said to be sufficiently linear.

Since the upper incident surface 52 and the lower incident surface 53 have the shapes as described above, they pass through the rear basic focal point O (see FIG. 3) of the lens as shown in FIG. In the vertical section of the basic optical axis (see the Z axis), the upper end UE of the upper incident surface 52 is located on the front side of the lower end Rvb of the lower incident surface 53.

On the other hand, in the cross section (horizontal cross section) shown in FIG. 4B, the upper incident surface 52 has a radius of curvature at the point M (see FIG. 4) where the basic optical axis (see Z axis) and the incident surface 51 intersect. Rhc is about 250 mm, the radius of curvature continuously increases toward the outer side in the horizontal direction, and the radius of curvature Rhl and Rhr are both about 450 mm on the outer edge side of the upper incident surface 52.
And also about the lower side entrance surface 53, the curvature radius is continuously large toward the outer periphery part side similarly in the horizontal cross section.

That is, the upper incident surface 52 has a shape in which the radius of curvature increases from the basic optical axis (see Z axis) side toward the outer edge of the upper incident surface 52 (a shape in which the radius of curvature increases radially). .
On the other hand, the lower incident surface 53 has a radius of curvature that increases from the horizontal center (Z-axis) side toward the outer side in the horizontal direction in consideration of the influence on the low beam light distribution pattern and the suppression of the light distribution collapse. The vertical cross section has a linear shape.

By forming the incident surface 51 on a convex free-form surface on the rear side provided with the upper incident surface 52 and the lower incident surface 53 having such a shape, it is possible to suppress the light distribution collapse due to the off-axis aberration. .

By the way, as shown in FIG. 3, it is on the rear side (about 2.1 mm rear side in this example) from the rear basic focus O of the lens 50 and vertically below the rear basic focus O of the lens 50 (in this example). The second light emitting chips 42 are arranged on a horizontal line passing through a point at a position of about 1.8 mm lower side), and the light emitted from each second light emitting chip 42 is not obstructed by anything, When the two light emitting chips 42 are not inclined obliquely upward in the vertical direction as in the present embodiment, when light is irradiated toward the lens 50, a light distribution pattern formed by light emitted from each second light emitting chip 42 is obtained. It may be separated in the vertical direction.

Specifically, there are cases where the light distribution patterns are separated in the vertical direction, such as the light distribution pattern on the screen shown in FIG.
FIG. 6 shows a first reflection of light from the second light emitting chip 42 disposed close to the left side (vehicle inside) of the vertical axis (see the Y axis) passing through the rear basic focal point O of the lens 50 in FIG. The second light emitting chip 42 is arranged without being reflected by the part 61 or the second reflecting part 62 and tilted upward in the vertical direction, and simulates the case where light is irradiated toward the incident surface 51. In FIG. 6, the VU-VL line indicates a vertical reference line on the screen, and the HL-HR line indicates a horizontal reference line on the screen.
Further, FIG. 6 shows the light distribution pattern on the screen by isoluminous lines.
In the following figures showing the light distribution pattern on the screen, the vertical reference line on the screen is indicated by the VU-VL line, and the horizontal reference line on the screen is indicated by the HL-HR line. It is assumed that the pattern is indicated by an isoluminous line.

That is, a light distribution pattern formed by light incident on the lens 50 from the upper incident surface 52 and irradiated on the front side appears on the lower side in the vertical direction on the screen, and enters the lens 50 from the lower incident surface 53. The light distribution pattern formed by the light irradiated to the front side may appear on the upper side in the vertical direction on the screen, and a light distribution pattern separated in the vertical direction may be formed.

Therefore, in the present embodiment, as described below, the light emitting direction of the second light emitting chip 42 is adjusted, and the amount of light is adjusted by the first reflecting unit 61, so that the light of the lens 50 is directed to the front side. By adjusting the shape of the exit surface 54 that irradiates the light, it is possible to form a better light distribution pattern with a rectangular shape as a whole, which will be described in detail below.

FIG. 7 is a view for explaining the shape of the exit surface 54 of the lens 50, and FIG. 7A is a view of the lens 50 viewed from the rear side (view of the entrance surface 51 in front). 7B is a vertical sectional view along the basic optical axis (see Z axis) passing through the rear basic focal point O of the lens 50. FIG.

As shown in FIG. 7B, the lens 50 has, as an exit surface 54, an upper exit surface 55 that is vertically above the basic optical axis (see Z axis) passing through the rear basic focal point O (see FIG. 3) of the lens 50. And a lower emission surface 56 on the lower side in the vertical direction from the basic optical axis (see Z axis).
Further, as shown in FIG. 7A, the lower emission surface 56, as viewed from the incident surface 51 side, the first lower emission surface 56a on the horizontal center side, and the horizontal left outer side (vehicle inner side). And an emission surface 56c on the right outside in the horizontal direction (vehicle outside).

Hereinafter, when the emission surface 56b and the emission surface 56c are collectively referred to, they may be referred to as second lower emission surfaces 56b and 56c.
That is, the lower emission surface 56 includes a first lower emission surface 56a on the center side in the horizontal direction, and two second lower emission surfaces 56b and 56c located on the outer side in the horizontal direction of the first lower emission surface 56a. have.

The first lower emission surface 56a is an area where light from the first light emitting chip 24 (see FIG. 3) that emits light for forming a low beam light distribution pattern is mainly irradiated toward the front side, The second lower emission surfaces 56b, 56c horizontally outward from the first lower emission surface 56a are regions where light from the first light emitting chip 24 (see FIG. 3) is not irradiated to the front side, that is, This is a region that does not greatly contribute to the formation of the low beam light distribution pattern.

Specifically, when a point light source is assumed at the rear basic focal point O of the lens 50 (see FIG. 7B), the horizontal and horizontal spread angles of light emitted from the point light source (the rear of the lens 50) A region in which light having an angle of 28 degrees or less that passes through the basic focal point O (incident with respect to the Z axis) is incident from the incident surface 51 and irradiated forward is defined as a first lower emission surface 56a. The regions on the outer side in the horizontal direction are the second lower emission surfaces 56b and 56c.

As shown in FIG. 6 in the high beam distribution pattern, the shape of the second lower emission surfaces 56b and 56c having a low contribution to the low beam distribution pattern is adjusted so as not to affect the low beam distribution pattern. It is possible to suppress the separation and bring it closer to a rectangular light distribution pattern.
As will be described later, the same operation is performed on the upper emission surface 55.

That is, for the second lower emission surfaces 56b and 56c, as shown in FIG. 7A, from the position Q1 on the first lower emission surface 56a side on the upper side in the vertical direction toward the outer peripheral edge side, the rear side of the lens 50. When a point light source is assumed at the basic focal point O (see FIG. 7B), the light from the point light source is formed in a shape that irradiates the lower side in the vertical direction on the screen.

More specifically, the position of the outer peripheral edge on the outer side in the horizontal direction from the position Q1 is defined as a position Q2, the position of the outer peripheral edge on the lower side in the vertical direction from the position Q1 is defined as a position Q3, and a straight line connecting the position Q2 and the position Q3. A position Q4 is a position that is the vertex of a right triangle other than the position Q2 and the position Q3 when the right triangle formed by connecting the position Q1, the position Q2, and the position Q3 is axisymmetric with respect to.

Assuming a rectangular shape connecting these four positions (position Q1, position Q2, position Q3, and position Q4), the light is emitted downward in the vertical direction on the screen as it approaches position Q2 from position Q1. In the position Q2, the second lower shape is formed so that light is emitted toward the lower side of the horizontal reference line on the screen by 1.5 degrees (in FIG. 7, the lower side is indicated by minus). The side emission surfaces 56b and 56c are formed.

Similarly, the light is emitted downward in the vertical direction on the screen as it approaches the position Q3 from the position Q1, and at the position Q3, 1.5 degrees below the horizontal reference line on the screen. The second lower emission surfaces 56b and 56c are formed in a shape for irradiating light toward the lower side (in FIG. 7, the lower side is indicated by minus).

Further, as the position Q1 approaches the position Q4, light is irradiated downward in the vertical direction on the screen. However, if the lens 50 is virtually located at the position Q4, the screen at the position Q4 The second lower emission surfaces 56b and 56c are formed in a shape that irradiates light toward the lower 1.5 degrees from the horizontal reference line on the upper side (in FIG. 7, the lower side is indicated by minus). Yes.
However, in reality, since the lens 50 does not exist up to the position Q4, the outer peripheral edge that is the end of the actual lens 50 does not reach the lower 1.5 degrees.

In the above description, the portions from the position Q1 to the position Q2, the position Q3, and the position Q4 have been described. However, the points on the line connecting the position Q1 to the position Q2 and the position Q4 and on the line connecting the position Q4 to the position Q3 are described. The same applies to the front.
Accordingly, as shown in FIG. 7A, the second lower emission surfaces 56b and 56c are positioned at the position Q1 on the first lower emission surface 56a side in the vertical direction (that is, the basic optical axis Z side (point M). When a point light source is assumed at the rear basic focal point O of the lens 50 (see FIG. 7B) from the position of the side) radially toward the outer peripheral edge, the light from the point light source is perpendicular to the screen. It is formed in a shape that irradiates downward in the direction.

The light emitted from the lower emission surface 56 to the front side forms a light distribution pattern that appears on the upper side in the vertical direction on the screen. As described above, the shapes of the second lower emission surfaces 56b and 56c Is adjusted so that the upper side of the upper light distribution pattern shown in FIG. 6 is positioned on the lower side, and the light is distributed so as to spread slightly in the horizontal direction. The light distribution is extended to the side of the lower light distribution pattern appearing on the screen, and the light distribution is controlled in the direction in which the two separated light distribution patterns are integrated.

On the other hand, the light emitted from the upper emission surface 55 to the front side forms a light distribution pattern that appears on the lower side in the vertical direction on the screen. By adjusting the shape of the upper emission surface 55, shown in FIG. While extending the lower light distribution pattern upward, it is integrated with the light distribution pattern appearing on the upper side in the vertical direction on the screen formed by the light from the lower emission surface 56 by being close to a rectangular shape, The light distribution pattern when the two light distribution patterns are multiplexed can be made closer to a rectangular shape.
Hereinafter, the upper emission surface 55 will be described.

As shown in FIG. 7B, the upper emission surface 55 irradiates light from the point light source forward from the lens 50 when assuming a point light source at the rear basic focal point O toward the upper side in the vertical direction. In this case, the light is distributed downward on the center side of the lens 50 and is distributed on the upper side of the lens 50.

More specifically, on the lower side in the vertical direction of the upper emission surface 55 (the boundary side with the lower emission surface 56), as shown by a light beam L1 (overlapping the Z axis) shown in FIG. Light from the point light source is irradiated in a substantially horizontal direction, but it is formed in a shape that continuously irradiates light from the point light source downward in the vertical direction toward the upper side in the vertical direction. In this position, as shown by the light beam L2, the light is irradiated at 1.2 degrees below the horizontal reference line on the screen in the vertical direction (in FIG. 7, the lower side is indicated by minus). .

Thereafter, the upper emission surface 55 is further formed in a shape that continuously irradiates light from a point light source toward the upper side in the vertical direction, and at the position on the uppermost vertical direction of the upper emission surface 55, As indicated by the light beam L3, light is emitted toward 0.7 degrees above the horizontal reference line on the screen in the vertical direction.

As described above, when the shape of the upper emission surface 55 is assumed to be a point light source at the rear basic focal point O toward the upper side in the vertical direction, light from the point light source is irradiated downward in the vertical direction. Assuming a shape that irradiates the upper side in the vertical direction, the lower vertical light distribution pattern shown in FIG. The light distribution range can be expanded to the upper side in the vertical direction while approaching the rectangular shape.

Further, when the light emitted from the upper emission surface 55 is continuously distributed downward in the vertical direction toward the upper side in the vertical direction and then distributed in the upper direction in the vertical direction to form a light distribution pattern, the lens 50 The spectral color appearing at the lower end of the light distribution pattern formed by the light emitted from the upper emission surface 55 can also be suppressed.

Then, the emission surface 54 is formed on a convex free-form surface on the front side including the lower emission surface 56 and the upper emission surface 55 having the above-described shape, and the upper emission surface 55 as shown in FIG. The light emitting surface is inclined upward in the vertical direction so that the light emitting optical axis OZ passing through the light emission center of the second light emitting chip 42 intersects the vertical intermediate portion of the upper incident surface 52 so as to increase the amount of light emitted from When the second light emitting chip 42 is arranged as described above, a light distribution pattern as shown in FIG. 8 is formed.

FIG. 8 is a diagram showing a light distribution pattern on the screen formed in a state before providing the first reflecting portion 61 and the second reflecting portion 62 in this embodiment, and FIG. FIG. 8B is a diagram showing a light distribution pattern formed by the light emitted from the lower emission surface 56, and FIG. FIG. 8C is a diagram illustrating a light distribution pattern formed by light from the second light emitting chip 42 on which the light distribution patterns of FIG. 8A and FIG. 8B are multiplexed.

As can be seen from FIG. 8, the light distribution pattern formed by the light emitted from the upper emission surface 55 (see FIG. 8A) is also the light distribution formed by the light emitted from the lower emission surface 56. The pattern (see FIG. 8B) is also substantially in the shape of a rectangle as a whole, and can be sufficiently overlapped in the vertical direction when these light distribution patterns are multiplexed. .

Therefore, as shown in FIG. 8C, the light distribution pattern formed by multiplexing the light distribution patterns shown in FIGS. 8A and 8B is cracked as shown in FIG. As a whole, it is quite close to a rectangular shape.

On the other hand, when looking at the light distribution pattern in FIG. 8B, there is a high luminous intensity band on the upper side in the vertical direction. Therefore, even in the light distribution pattern in FIG. 8C, the high luminous intensity band appears slightly on the upper side in the vertical direction. ing.
Therefore, in the present embodiment, as shown in FIG. 3, the separation of the high luminous intensity band is further suppressed by mainly providing the first reflecting portion 61.

Specifically, with reference to FIG. 3, as described above, of the light emitted from each second light emitting chip 42 downward in the vertical direction, the basic passing through the rear basic focal point O of the lens 50. The light emitted downward in the vertical direction at an angle θ2 larger than about 17 ° with respect to the optical axis (see Z axis) is reflected toward the upper incident surface 52, and is reflected from the lower incident surface 53 to the lens 50. The incident light is limited.
That is, the first reflecting portion 61 reflects a part of the light directed to the lower incident surface 53 out of the light emitted from each second light emitting chip 42 to the lens 50 to the upper incident surface. The amount of light incident on 52 is greater than the amount of light incident on the lower incident surface 53.

In the present embodiment, the first reflecting portion 61 has a light quantity incident on the lower incident surface 53 that is less than half of the light emitted directly from the second light emitting chip 42 toward the lower incident surface 53. The light is reflected toward the upper incident surface 52 so as to be almost halved in this example.
In addition, it is not always necessary to make it half or less. For example, it is preferable that the amount of light is about 1/3 to 6/7.

In this way, the light distribution pattern formed by the light incident on the lens 50 from the lower incident surface 53 and irradiated from the lower output surface 56, that is, the light amount of the light distribution pattern appearing on the upper side of the screen is halved. can do.

As shown in FIG. 3, the light reflected by the first reflecting portion 61 is irradiated from the upper emission surface 55 about 5 degrees above the horizontal reference line on the screen, as shown in FIG. Light distribution is performed on the outer periphery on the upper side in the vertical direction of the light distribution pattern shown in FIG.

In the embodiment, a light diffusing structure for diffusing light is provided on the incident surface 51 so that the light distribution is uniform.
FIG. 9 is a view for explaining the light diffusion structure formed on the incident surface 51.
In addition, in FIG. 9, the figure which shows the shape of a light-diffusion structure is also shown in figure as an enlarged view.
As shown in FIG. 9, the light diffusion structure divides the incident surface 51 into four regions (first region 57a, second region 57b, third region 57c, and fourth region 57d) to adjust the amount of light diffusion. Yes.

The light diffusion structure formed in each region (the first region 57a, the second region 57b, the third region 57c, and the fourth region 57d) has a structure in which a plurality of irregularities are formed as shown in the enlarged view. In order to adjust the amount of light diffusion, the amount of unevenness (height of unevenness) corresponding to each region is set.
In the present embodiment, the light diffusing structure is shown with rounded irregularities, but the light diffusing structure may have a ridge line of a rectangle or a rhombus, and a concave or convex square pyramid. It may be a structure.
In addition, there may be a portion with the basic shape of the incident surface 51 between the convex portions or the concave and convex portions, and the light diffusion amount may be adjusted by adjusting the density of the convex portions, the concave portions, and the convex portions.

Specifically, in the first region 57a corresponding to the lower incident surface 53, the unevenness amount is set to 5 μm in consideration of the influence on the low beam light distribution pattern, and the light distribution shown in FIG. The pattern is obscured and the high luminous intensity band seen in FIG. 8B becomes inconspicuous.
On the other hand, as a region corresponding to the upper incident surface 52, a second region 57b which is the central side in the horizontal direction, a third region 57c on the right side in the horizontal direction of the second region 57b (the vehicle outside), and a horizontal region of the second region 57b. The fourth region 57d on the left side of the direction (inner side of the vehicle) is set, and the amount of light diffusion is larger than that of the light diffusion structure formed on the lower incident surface 53 with the unevenness of the second region 57b being 6 μm. Is set larger.

The amount of light diffusion in the second region 57b is increased to add a harshness, and the inner side of the light distribution pattern in FIG. 8A is widened outward to make the light distribution shape closer to a rectangular shape. At the same time, the amount of light is made uniform.
On the other hand, the third region 57c and the fourth region 57d located on the outer side in the horizontal direction of the second region 57b have an unevenness amount of 4 μm and a small amount of wrinkle, and the rectangular shape of the light distribution pattern is maintained. The uniformity of light distribution can be improved by combining with the tanning in the two regions 57b.

FIG. 10 is a diagram showing a light distribution pattern on the screen of the vehicular lamp according to the present embodiment, and FIG. 10 (a) is a light distribution pattern formed by light emitted from the upper emission surface 55. 10 (b) is a light distribution pattern formed by light emitted from the lower emission surface 56, and FIG. 10 (c) is a diagram in which the light distribution patterns of FIG. 10 (a) and FIG. 10 (b) are multiplexed. It is a figure which shows the light distribution pattern which the light from the 2nd light emitting chip | tip 42 forms.

As shown in FIG. 10, by providing the first reflecting portion 61 and the light diffusion structure, the light distribution pattern of FIG. 10 (a) is closer to a rectangular shape than FIG. 8 (a). The light distribution pattern in FIG. 10B is closer to a rectangular shape than in FIG.
As can be seen from FIG. 10 (c), the light distribution pattern obtained by multiplexing these light distribution patterns has a single high-luminance band and has a good rectangular shape as a whole. .

By the way, all the light distribution patterns so far are close to the left side (the vehicle inner side) of the vertical axis (see the Y axis) passing through the rear basic focal point O of the lens 50 when viewed from the front side of the vehicle in FIG. Although the light distribution pattern formed by the light from the arranged second light emitting chip 42 has been shown, the influence of the light distribution collapse due to the off-axis aberration is the vertical axis passing through the rear basic focal point O of the lens 50 (see the Y axis). ) Easily appear in the light distribution pattern formed by the light from the second light emitting chip 42 farthest from.

Accordingly, FIG. 11 is arranged at a position farthest to the left (the vehicle inner side) from the vertical axis (see the Y axis) passing through the rear basic focal point O of the lens 50 in a front view as viewed from the vehicle front side in FIG. The light distribution pattern formed with the light from the 2nd light emitting chip | tip 42 is shown.

As can be seen from FIG. 11, in the present embodiment, the incident surface 51 is formed in the shape as described above, and the off-axis aberration is suppressed, so that the light distribution pattern has a clean rectangular shape. The light distribution collapse due to off-axis aberrations is greatly suppressed.

Although the present invention has been described based on the specific embodiments, the present invention is not limited to the above embodiments.
For example, in the above embodiment, as described with reference to FIG. 4A, the upper incident surface 52 has a radius of curvature Rvc of about 150 mm on the point M (see FIG. 4) side and is directed upward in the vertical direction. Since the radius of curvature continuously increases and the radius of curvature Rvt on the outer edge side is about 300 mm, the upper entrance surface 52 has an average radius of curvature averaged from the point M to the outer edge, It was a relatively small gradually changing curved surface.

On the other hand, the lower incident surface 53 is linear from the point M to the lower end Rvb in order to suppress the influence on the low beam light distribution pattern, and the curvature from the point M to the lower end Rvb. The average curvature radius obtained by averaging the radii (including the complete straight line from the point M to the lower end portion Rvb (the curvature radius is infinite)) is larger than the average curvature radius of the upper incident surface 52.

The lower incident surface 53 only needs to have an average radius of curvature that is larger than the average curvature radius of the upper incident surface 52 and can suppress the influence on the low beam light distribution pattern. The curvature radius may be gradually changed from the bottom toward the lower end Rvb.
For example, the lower incident surface 53 has a radius of curvature Rvc of about 150 mm on the point M (see FIG. 4) side of the lower incident surface 53, and the radius of curvature continuously increases downward in the vertical direction. It may be a curved surface in which the curvature radius is gradually changed so that the curvature radius is about 1000 mm at the lower end Rvb.

Even in this case, since the lower incident surface 53 has an average radius of curvature larger than that of the upper incident surface 52 as in the above-described embodiment, the basic passing through the rear basic focal point O (see FIG. 3) of the lens. In the vertical cross section of the optical axis (see Z-axis), the upper end UE (see FIG. 4) of the upper incident surface 52 is positioned in front of the lower end Rvb (see FIG. 4) of the lower incident surface 53. Become.

As described above, by making the lower incident surface 53 a gradually curved surface, the influence of off-axis aberrations is further suppressed, and the arrangement is much closer to a rectangular shape than the light distribution pattern shown in FIG. It can be a light pattern.

As described above, the present invention includes modifications and improvements that do not depart from the technical idea, and are also included in the technical scope of the invention. It is clear from

The invention described in the scope of claims attached to the application for the pre-priority application is added below. The item numbers of the claims described in the appendix are as in the scope of the claims first attached to the application for the pre-priority application.
<Claim 1>
A first light emitting chip for low beam distribution;
A plurality of second light emitting chips arranged in a horizontal direction for high beam distribution;
A lens that irradiates light of the first light emitting chip and the second light emitting chip forward;
A reflector that reflects light from the first light emitting chip toward the lens;
A shade that blocks a portion of the light reflected by the reflector, and
The lens is
An upper incident surface on the upper side in the vertical direction from the basic optical axis passing through the rear basic focal point of the lens;
A lower incident surface vertically below the basic optical axis, and
The upper incident surface has a shape in which the radius of curvature increases from the basic optical axis side toward the outer edge of the upper incident surface,
The lower incident surface is
A vehicular lamp having a shape in which a radius of curvature increases from a horizontal center side toward a horizontal direction outer side and a vertical cross section is linear.
<Claim 2>
The lens is
An upper emission surface on the upper side in the vertical direction from the basic optical axis;
A lower emission surface vertically below the basic optical axis, and
The upper emission surface is formed in such a shape that light radiated forward from the lens is distributed such that the central side in the vertical direction of the lens distributes to the lower side in the vertical direction, and the upper side in the vertical direction of the lens distributes to the upper side in the vertical direction. And
The lower emission surface is
A first lower emission surface on the horizontal center side;
Two second lower emission surfaces located on the outside in the horizontal direction of the first lower emission surface,
The second lower emission surface is closer to the outer peripheral edge of the second lower emission surface from the position on the basic optical axis side toward the outer peripheral edge of the second lower emission surface. The vehicular lamp according to claim 1, wherein the vehicular lamp is formed in a shape that irradiates light from the lower side in the vertical direction.
<Claim 3>
The second light emitting chip is disposed on the lower side in the vertical direction on the rear side than the rear basic focus of the lens,
The light emitting surface of the second light emitting chip is disposed so as to be inclined upward in the vertical direction so that a light emitting optical axis passing through a light emitting center intersects the upper incident surface. The vehicle lamp as described in 2.
<Claim 4>
A first reflecting part for reflecting a part of light emitted from the second light emitting chip toward the lower incident surface upward in the vertical direction;
4. The apparatus according to claim 1, further comprising: a second reflecting portion configured to reflect a part of light emitted upward from the second light emitting chip in the vertical direction downward. Item 1. A vehicle lamp according to item 1.
<Claim 5>
The first reflecting unit has a light quantity incident on the lower incident surface of the light emitted directly from the second light emitting chip toward the lower incident surface from 1/3 to 2/3. Thus, the vehicular lamp according to claim 4, wherein the vehicular lamp reflects light.
<Claim 6>
A light diffusing structure that is formed on the lower incident surface and the upper incident surface and diffuses light incident on the lens;
2. The light diffusion structure formed on the center side in the horizontal direction of the upper incident surface has a light diffusion amount set larger than that of the light diffusion structure formed on the lower incident surface. The vehicular lamp according to claim 5.

DESCRIPTION OF SYMBOLS 10 Lamp unit 20 Heat sink 21 Base part 22 Radiation fin 23 1st board | substrate 24 1st light emitting chip 25 1st light source 26 Mounting part 27 Holder 30 Reflector 30a Reflective surface 31 Shade 31a Edge 40 Attachment member 40a 1st surface 41 2nd Substrate 42 Second light emitting chip 43 Second light source 44 Power supply connector 50 Lens 50a Lens holder 51 Incident surface 52 Upper incident surface 53 Lower incident surface 54 Emitting surface 55 Upper emitting surface 56 Lower emitting surface 56a First lower emitting surface 56b 56c Second lower emission surface (emission surface)
57a 1st area | region 57b 2nd area | region 57c 3rd area | region 57d 4th area | region 61 1st reflection part 62 2nd reflection part 101L, 101R Vehicle headlamp 102 Vehicle BF Basic focus D Point F Focal length K Distance L Lens M Point O Back basic focus OSC Sine condition violation amount OZ Light emission optical axis P Optical axes Q1, Q2, Q3, Q4 Position S1 One surface S2 The other surface SML Main surface SP Principal points θ1, θ2 Angle

Claims (6)

A first light emitting chip for low beam distribution;
A plurality of second light emitting chips arranged in a horizontal direction for high beam distribution;
A lens that irradiates light of the first light emitting chip and the second light emitting chip forward;
A reflector that reflects light from the first light emitting chip toward the lens;
A shade that blocks a portion of the light reflected by the reflector, and
The lens is
An upper incident surface on the upper side in the vertical direction from the basic optical axis passing through the rear basic focal point of the lens;
A lower incident surface vertically below the basic optical axis, and
The upper incident surface has a shape in which the radius of curvature increases from the basic optical axis side toward the outer edge of the upper incident surface,
The lower incident surface is
A vehicular lamp having a shape in which a radius of curvature increases from a horizontal center side toward a horizontal direction outer side and a vertical cross section is linear. The second light emitting chip is disposed on the lower side in the vertical direction on the rear side than the rear basic focus of the lens,
2. The vehicle according to claim 1, wherein the second light emitting chip is disposed such that a light emitting surface is inclined upward in a vertical direction so that a light emitting optical axis passing through a light emitting center intersects the upper incident surface. Lamps. A first reflecting part for reflecting a part of light emitted from the second light emitting chip toward the lower incident surface upward in the vertical direction;
2. The vehicular lamp according to claim 1, further comprising: a second reflecting portion configured to reflect a part of light emitted upward from the second light emitting chip in the vertical direction downward. The first reflecting unit has a light amount incident on the lower incident surface of the light emitted directly from the second light emitting chip toward the lower incident surface from 1/3 to 6/7. Thus, the vehicular lamp according to claim 3, wherein the vehicular lamp reflects light. A light diffusing structure that is formed on the lower incident surface and the upper incident surface and diffuses light incident on the lens;
2. The light diffusion structure formed on the center side in the horizontal direction of the upper incident surface has a light diffusion amount set larger than that of the light diffusion structure formed on the lower incident surface. The vehicle lamp as described in 2. A first light emitting chip for low beam distribution;
A plurality of second light emitting chips arranged in a horizontal direction for high beam distribution;
A lens that irradiates light of the first light emitting chip and the second light emitting chip forward;
A reflector that reflects light from the first light emitting chip toward the lens;
A shade that blocks a portion of the light reflected by the reflector, and
The lens is
An upper incident surface on the upper side in the vertical direction from the basic optical axis passing through the rear basic focal point of the lens;
A lower incident surface vertically below the basic optical axis, and
A vehicle characterized in that, in a vertical cross section along a basic optical axis passing through a rear basic focal point of the lens, an upper end portion of the upper incident surface is located in front of a lower end portion of the lower incident surface. Lamps.

Images