TW201610552A - Lighting device, projection device and light source device - Google Patents

Abstract

This lighting device (40) comprises an optical element (50), and an irradiation device (60) for irradiating light onto the optical element in such a manner as to scan over the optical element. The irradiation device comprises a light source device (61) for emitting light, and a scanner (70) having a reflective member (79) containing a reflective surface (79a) for reflecting the light from the light source device. The reflective member is rotatable centered around a rotation axis line (Ra1), which is tilted with respect to the normal direction (nd1) of the reflective surface. The light source device comprises a plurality of light sources (62a to 62g), optical fibers (64a to 64g) provided to correspond to the light sources respectively, and collimating lenses (67a to 67g) provided to correspond to the optical fibers respectively.

Description

Lighting device, projection device and light source device

The present invention relates to an illumination device including an optical element and an illumination device that irradiates the optical element with light so as to be scanned on the optical element. Furthermore, the invention relates to a projection device having such a lighting device. Further, the present invention relates to a scanning device and an optical module for changing an optical path of incident light.

An illumination device using an optical element composed of a lens array or a hologram is known, for example, as disclosed in JP 2012-123381 A. The illumination device disclosed in JP 2012-123381 A is provided with an illumination device having a light source device that emits light and a scanning device that periodically changes an optical path of light from the light source device. The illumination device irradiates the optical element with light that is scanned on the optical element. Light incident on each region of the optical element is shaped by the optical element to illuminate a predetermined area. According to this illuminating device, it is possible to illuminate a predetermined region from different directions over time, and it is possible to illuminate the predetermined region more uniformly. In addition, JP2012-123381A also reports that since the specified area is illuminated from different directions over time, it is possible to suppress spots on the area illuminated by the illumination light. (speckle), and spots caused by the rough surface of the illumination, such as the light diffusion of the screen.

Recently, high-output type light source devices using a plurality of laser light sources have also been studied. However, if such a high-output type light source device is to be applied to the above-described illumination device including the scanning device, the reflecting surface of the scanning device may be easily damaged. As a result, the traveling direction of the light emitted from the high-output light source device cannot be stably controlled. In addition, if the durability of the scanning device is to be improved, new problems such as complication or enlargement of the device may be caused.

The present invention has been made in view of the above problems, and an object thereof is to provide an illumination device capable of stably and accurately controlling a traveling direction of high-output light from a light source device, a projection device including the illumination device, and a light source suitable for the illumination device Device.

An illuminating device according to the present invention includes: an optical element; an illuminating device that illuminates the optical element so as to scan the optical element; the illuminating device includes a light source device that emits light; and the scanning device includes a reflecting member. The reflecting member includes a reflecting surface that reflects light from the light source device; the reflecting member is inclined with respect to a normal direction of the reflecting surface The oblique light axis is centered and rotatable, and the light source device has: a plurality of light sources; a plurality of optical fibers disposed corresponding to the respective light sources for transmitting light emitted from the corresponding light source; and a plurality of collimating lenses, Corresponding to each of the aforementioned optical fibers, the optical path of the light emitted from the corresponding optical fiber is adjusted.

In the illuminating device according to the present invention, the region of the reflecting surface of the scanning device that is irradiated with light emitted from one of the plurality of collimating lenses may be subjected to a plurality of The area of the aforementioned reflecting surface of the scanning device illuminated by the light emitted by the collimating lens other than the one of the straight lenses is at least partially offset.

According to the illuminating device of the present invention, each region on the reflecting surface of the scanning device that is irradiated with light emitted from each of the plurality of collimating lenses may be located on the reflecting surface. An imaginary circumference or elliptical circumference.

In the illumination device according to the present invention, the region on the reflection surface of the scanning device that is irradiated with light emitted from one of the plurality of collimating lenses may be located at the reflection. An imaginary circumference or an elliptical circumference of the surface, and the reflection surface of the scanning device irradiated by light emitted from each of the collimating lenses other than the one of the plurality of collimating lenses Each area on the upper part is located in an imaginary circle Week or elliptical week.

In the illumination device according to the present invention, the region on the reflection surface that is irradiated with light emitted from one of the collimating lenses may be larger than the collimator lens from the collimator lens. Each area on the aforementioned reflecting surface illuminated by the emitted light is also large.

In the illuminating device according to the present invention, the plurality of collimating lenses may be located on an imaginary circumference or an elliptical circumference.

In the illumination device of the present invention, one of the plurality of collimating lenses may be located in an imaginary circumference or an elliptical circumference, and one of the plurality of collimating lenses may be collimated. A collimating lens other than the lens is located on an imaginary circumference or elliptical circumference as described above.

In the illumination device according to the present invention, any one of the collimating lenses may be larger than each of the collimating lenses other than the collimating lens.

In the illumination device according to the present invention, the emission end of each of the plurality of optical fibers may be located on an imaginary circumference or an elliptical circumference.

In the illuminating device of the present invention, the emitting end of one of the plurality of optical fibers may be located in an imaginary circumference or an elliptical circumference, and the optical fiber other than the one of the plurality of optical fibers Each of the injection ends is located on one of the aforementioned imaginary circumferences or elliptical circumferences.

The light source device according to the present invention comprises: a plurality of light sources; the plurality of optical fibers are disposed to correspond to the respective light sources for propagating light emitted from the corresponding light source; and the plurality of collimating lenses are disposed to correspond to the respective optical fibers respectively, and are adjusted from the corresponding optical fibers The light path of the emitted light.

In the light source device according to the present invention, the plurality of collimating lenses may be located on an imaginary circumference or an elliptical circumference.

In the light source device of the present invention, one of the plurality of collimating lenses may be located in an imaginary circumference or an elliptical circumference, and one of the plurality of collimating lenses may be collimated. A collimating lens other than the lens is located on an imaginary circumference or elliptical circumference as described above.

In the light source device according to the present invention, any one of the collimating lenses may be larger than each of the collimating lenses other than the one of the collimating lenses.

In the light source device according to the present invention, the output end of each of the plurality of optical fibers may be located on an imaginary circumference or an elliptical circumference.

In the light source device of the present invention, the emission end of one of the plurality of optical fibers may be located in an imaginary circumference or an elliptical circumference, and the optical fiber other than the one of the plurality of optical fibers Each of the injection ends is located on one of the aforementioned imaginary circumferences or elliptical circumferences.

A projection device according to the present invention, comprising: Any of the above illumination devices according to the present invention; the spatial light modulator is illuminated by light from the illumination device.

The projection device according to the present invention may further include: a relay optical system that relays light from the illumination device to the spatial light modulator; and the relay optical system is formed by the illumination device The intermediate image is mapped to the spatial light modulator.

According to the present invention, the traveling direction of the high-output light from the light source device can be controlled with high precision.

10‧‧‧Projection image display device

15‧‧‧ screen

20‧‧‧projection device

25‧‧‧Projection Optical System

26‧‧ ‧ field lens

27‧‧‧Projection lens

30‧‧‧Spatial light modulator

35‧‧‧Continuous optical system

35a‧‧‧1st lens

35b‧‧‧2nd lens

37‧‧‧Homogeneous optical system

37a‧‧‧Incoming surface

37b‧‧‧ shot surface

40‧‧‧Lighting device

45‧‧‧Optical module

50‧‧‧Optical components

51‧‧‧ lens array

51a‧‧‧unit lens

52‧‧‧ Concentrating lens

53‧‧‧2nd lens array

53a‧‧ unit lens

57‧‧‧All-image recording media

60‧‧‧ illumination device

61‧‧‧Light source device

62a~62g‧‧‧ light source

64a~64g‧‧‧ fiber

64ax~64gx‧‧‧Optical end of fiber 64a~64g

64ay~64gy‧‧‧Optical end of fiber 64a~64g

66‧‧‧ Collimating lens array

67a~67g‧‧‧ collimating lens

68‧‧‧ Keeping components

70‧‧‧ scanning device

72‧‧‧ Controller

75‧‧‧reflecting elements

76‧‧‧ drive

77‧‧‧Shell

78‧‧‧Axis components

79‧‧‧reflecting members

79a‧‧‧reflecting surface

80‧‧‧2nd reflective element

81‧‧‧2nd drive unit

82‧‧‧ Shell

83‧‧‧Axis components

84‧‧‧2nd reflection member

84a‧‧‧2nd reflecting surface

98‧‧‧ Collimating lens

99‧‧‧Fiber

99y‧‧‧jecting end of fiber 99

Fig. 1 is a schematic view showing a schematic configuration of an illumination device, a projection device, and a projection display device according to an embodiment of the present invention.

2] FIG. 2 is a view showing an example of a positional relationship between an emission end of an optical fiber and a collimator lens in a light source device of an illumination device included in an illumination device.

[Fig. 3] Fig. 3 is a view showing another example of the positional relationship between the emitting end of the optical fiber and the collimating lens in the light source device.

4] Fig. 4 is a schematic plan view of a collimator lens array of a light source device.

Fig. 5 is a schematic perspective view of a scanning device of an irradiation device.

Fig. 6 is a schematic plan view showing a reflecting surface of the scanning device.

Fig. 7 is a schematic side view showing the illuminating device model.

Fig. 8 is a schematic side view showing an example of an optical element of an illumination device.

Fig. 9 is a schematic side view showing another example of an optical element of an illumination device.

Fig. 10 is a view corresponding to Fig. 4 and is a schematic view showing a modification of the light source device.

Fig. 11 is a schematic plan view showing a reflecting surface of a scanning device used in combination with the light source device of Fig. 10, corresponding to Fig. 6.

Fig. 12 is a view corresponding to Fig. 1 and is a schematic view showing a modification of the scanning device.

Fig. 13 is a perspective view corresponding to Fig. 5 and is a schematic perspective view of the scanning device of Fig. 12.

Fig. 14 is a flow chart for explaining a control method of the scanning device of Figs. 12 and 13 .

Fig. 15 is a schematic side view showing a modification of the optical element.

Fig. 16 is a schematic view showing a modification of the projection device.

Fig. 17 is a schematic view showing another modification of the projection device.

18] Fig. 18 is a schematic view showing a reference example of a light source device.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, in the drawings attached to the present specification, for ease of illustration and easy understanding, It is appropriate to exaggerate the scale and the aspect ratio of the aspect and the like with respect to the actual object.

In addition, the shapes or geometric conditions used in the present specification and the values indicating the degree of "parallel", "orthogonal", "identical", or the length or angle, etc., are not subject to rigorous meaning. Limit, but is interpreted as including the extent to which the same function is expected to be achieved.

The projection display apparatus 10 shown in FIG. 1 has a screen 15 and a projection device 20 for projecting image light. The projection device 20 includes an illumination device 40 that illuminates an illuminated region LZ on an imaginary surface, and a spatial light modulator 30 that is disposed at a position overlapping the illuminated region LZ and illuminated by the illumination device 40; and a projection optical system 25. The coherent light from the spatial light modulator 30 is projected onto the screen 15. In the illustrated example, the projection optical system 25 sequentially includes a field lens 26 and a projection lens 27 along the optical path. That is, in one embodiment described herein, the illumination device 40 is incorporated in the projection device 20 as an illumination device for illuminating the spatial light modulator 30. In particular, in the present embodiment, the illumination device 40 illuminates the illuminated region LZ by the same dimming, and the illumination device 40 is worked on to make the spots less noticeable.

First, the lighting device 40 will be described. As shown in Fig. 1, the illuminating device 40 has an optical element 50 that directs the traveling direction of light toward the illuminated area LZ, and an illuminating unit 60 that illuminates the optical element 50, particularly in this example, illuminating the same light. In the example shown in Figure 1, the illumination device 60, the optical element 50 is irradiated with the same dimming light in such a manner that the dimming light is scanned on the optical element 50. Therefore, at a certain moment, the region on the optical element 50 that is irradiated with the dimming by the irradiation device 60 becomes a part of the surface of the optical element 50.

The illuminating device 60 includes a light source device 61 that emits the same light in a specific wavelength band, and a scanning device 70 that guides the traveling direction of the light from the light source device 61 toward the optical element 50. Further, the optical module 45 is formed by the scanning device 70 and the optical element 50. The light source device 61 is formed as a high-output type light-emitting source. The light source device 61 includes a plurality of light sources 62a to 62g, and a plurality of optical fibers 64a to 64g disposed corresponding to the respective light sources, and a plurality of collimating lenses 67a to 67g disposed to correspond to the respective optical fibers.

Each of the light sources 62a to 62g is composed of a laser light source that generates the same dimming light. The light source device 61 achieves high output by using a plurality of laser light sources that generate laser light of the same wavelength band. Further, the optical fibers 64a to 64g are members for transmitting light generated by the respective light sources 62a to 62g. Therefore, the light sources 62a to 62g may be disposed at positions away from the illuminated region LZ illuminated by the illumination device 40. In other words, by using the optical fibers 64a to 64g, it is possible to effectively cope with noise or heat generation of the light sources 62a to 62g, and cooling devices for providing the light sources 62a to 62g. The collimator lenses 67a to 67g are members for adjusting the optical paths of the light emitted from the optical fibers 64a to 64g.

In the illustrated example, one optical fiber 64a to 64g and one collimating lens 67a to 67g are provided for each of the light sources 62a to 62g. That is, the incident ends 64ax~64gx of the respective optical fibers 64a-64g are connected to the optical fiber. 64a ~ 64g corresponding light source 62a ~ 62g. Further, collimating lenses 67a to 67g corresponding to the optical fibers 64a to 64g are provided at positions facing the emitting ends 64ay to 64gy of the respective optical fibers 64a to 64g. In the embodiment shown in the figure, the first to seventh light sources 62a to 62g are provided, and the first to seventh optical fibers 64a to 64g and the first to seventh collimating lenses 67a to 67g are provided. Further, in the illustrated example, the seven collimating lenses 67a to 67g are integrally held by the holding member 68 to form the collimator lens array 66.

As shown in Fig. 1, in the present embodiment, the collimator lenses 67a to 67g are formed such that the traveling directions of the lights emitted from the optical fibers 64a to 64g are parallelized. In particular, the light generated by the different light sources 62a to 62g travels in parallel with each other and faces the scanning device 70. Therefore, the optical fibers 64a to 64g are aligned such that the emission ends 64ay to 64gy are aligned so that the light emission directions coincide with each other. Further, the collimator lenses 67a to 67g are arranged such that the optical axes are parallel to each other.

2 and 3 illustrate the positional relationship between the output ends 64ay to 64gy of the optical fibers 64a to 64g and the collimator lenses 67a to 67g. In the example shown in Figs. 2 and 3, the size of the collimator lenses 67a to 67g is not constant between the plurality of collimating lenses 67a to 67g. Therefore, in the example shown in Fig. 2, the numerical aperture NA (Numerical Aperture) of the light emitted from the optical fibers 64a to 64g is set to be different from each other, and the output ends 64ay to 64gy of the optical fibers 64a to 64g are aligned with the collimator lens 67a. The distance of ~67g remains fixed. On the other hand, in the example shown in Fig. 3, since the NAs of the light beams emitted from the optical fibers 64a to 64g are identical to each other, the distances between the output ends 64ay to 64gy of the optical fibers 64a to 64g and the collimator lenses 67a to 67g are different from each other.

Further, in the examples shown in FIGS. 2 and 3, a plurality of collimating lenses 67a to 67g are disposed on the first imaginary plane vfp1. The output ends 64ay to 64gy of the optical fibers 64a to 64g are disposed on the second imaginary plane vfp2 parallel to the first imaginary plane vfp1 in the example shown in FIG. 2, but are not disposed in the fixed example in the example shown in FIG. Imaginary on the plane. Although not shown in the drawings, as a modification of the embodiment shown in FIG. 3, the emission ends 64ay to 64gy of the optical fibers 64a to 64g may be arranged on the second imaginary plane vfp2, but a plurality of collimating lenses 67a to 67g may be provided. It is not configured on a fixed imaginary plane.

In Fig. 4, the state in which the collimator lens array 66 is viewed along the optical axis direction of the collimator lenses 67a to 67g is disclosed. In the example shown in FIG. 4, one of the plurality of collimating lenses 67a to 67g is located inside an imaginary circumference or an elliptical circumference c1 of the first imaginary plane vfp1, and a plurality of collimations The collimator lenses 67b to 67g other than one of the lenses 67a to 67g are located on an imaginary circumference or an elliptical circumference c1. More specifically, in the example shown in FIG. 4, among the first to seventh collimating lenses 67a to 67g, only the first collimating lens 67a is positioned on an imaginary circumference or elliptical circumference c1 of the first imaginary plane vfp1. Internally, the second to seventh collimating lenses 67b to 67g are passed through an imaginary circumference or an elliptical circumference c1. According to the arrangement of the collimator lenses 67a to 67g, a plurality of collimating lenses can be arranged at a high density. Further, from the viewpoint of arranging a plurality of collimating lenses at a high density, the second to seventh collimating lenses 67b to 67g are preferably arranged at equal intervals on an imaginary circumference or an elliptical circumference c1. In the example shown in Figure 2, The 2nd to 7th collimating lenses 67b to 67g have the same planar shape and are arranged at equal intervals on the circumference c1.

In Fig. 4, in addition to the respective collimator lenses 67a to 67g, the positions of the output ends 64ay to 64gy of the optical fibers 64a to 64g corresponding to the respective collimator lenses 67a to 67g are disclosed. In the example shown in Fig. 4, when viewed from the optical axis direction of the collimator lenses 67a to 67g, the output ends 64ay to 64gy of the optical fibers 64a to 64g corresponding to the collimator lenses 67a to 67g are arranged in the collimating lens. The positions where the optical axes of 67a to 67g overlap. That is, the emission end 64ay of one of the plurality of optical fibers 64a to 64g is located inside an imaginary circumference or an elliptical circumference c2 located on the imaginary plane vfp2, and among the plurality of optical fibers 64a to 64g Each of the output ends 64by to 64gy of the optical fibers 64b to 64g other than the one of the optical fibers 64a is located on an imaginary circumference or an elliptical circumference c2. More specifically, the emission end 64ay of the first optical fiber 64a among the plurality of optical fibers 64a to 64g is located inside an imaginary circumference or an elliptical circumference c2 on the second imaginary plane vfp2, and is other than the first optical fiber 64a. The respective output ends 64by to 64gy of the 2nd to 7th optical fibers 64b to 64g are located on an imaginary circumference or an elliptical circumference c2. In the example shown in FIG. 2, the respective output ends 64by to 64gy of the second to seventh optical fibers 64b to 64g are arranged at equal intervals on the circumference c2.

Further, particularly in the example shown in Fig. 4, one of the collimator lenses 67a is larger than the collimator lenses 67b to 67g other than the one collimator lens 67a. In other words, the projected area of the first collimator lens 67a in the optical axis direction is smaller than the second to seventh collimating lenses 67b to 67g. The projected area for the optical axis direction is also large. According to this aspect, as will be described later, even in the low output state in which only the first light source 62a is used, the speckle can be effectively made inconspicuous.

According to the light source device 61 having the above configuration, it is possible to emit a parallel light beam of a large amount of light dispersed in a wide area, in other words, a large light amount parallel beam having a large spot diameter, toward the scanning device 70. Moreover, the light emitted from the light source device 61 can be parallel-beamed with high precision for the reason described later.

Next, the scanning device 70 will be described. As a specific example of the illustration, the scanning device 70 includes a reflection element 75 having a reflection surface 79a that reflects light from the light source 62, and a controller 72 connected to the reflection element 75. The orientation of the reflecting surface 79a of the reflecting element 75 can be varied repeatedly within a predetermined movable range. The light irradiated from the light source device 61 is scanned on the optical element 50 by the direction of the reflecting surface 79a being repeatedly changed.

In the illustrated example, the reflecting member 75 has a reflecting member 79 having a reflecting surface 79a and a driving device 76 for rotationally driving the reflecting member 79. As shown in FIGS. 1 and 5, the drive unit 76 is configured as an electric motor, and has a casing 77 that functions as a stator and a shaft member 78 that functions as a rotor. The reflection member 79 is attached to the shaft member 78 and is rotatable about the first rotation axis Ra1 together with the shaft member 78. However, the reflecting surface 79a is not orthogonal with respect to the rotation axis Ra1. In other words, the normal direction nd1 (see FIG. 3) of the reflecting surface 79a is not parallel to the rotation axis Ra1, and is inclined with respect to the rotation axis Ra1. Therefore, if the reflection member 79 is rotated about the rotation axis Ra1, the reflection surface 79a Will change the orientation. At this time, when the rotation of the reflection member 79 is a constant speed, the reflection surface 79a periodically changes the orientation around the first virtual orthogonal plane vp1 orthogonal to the rotation axis Ra1.

Further, in combination with the above-described light source device 61, the reflecting surface 79a of the reflecting element 75 preferably has a circular shape or an elliptical shape when viewed from the normal direction nd toward the reflecting surface 79a. The light emitted from the light source device 61 can be efficiently incident into the circular or elliptical reflecting surface 79a. In other words, it is not necessary to increase the amount of the reflecting member 79 that is driven by the driving device 76 at a high speed, and the light from the light source device 61 can be utilized with excellent use efficiency.

Here, an example of the planar shape of the reflecting surface 79a in the case of observing from the normal direction nd is shown in FIG. In addition, in FIG. 6, the area on the reflection surface 79a from which the light emitted from each of the first to seventh light sources 62a to 62g of the light source device 61 can enter is indicated by the first to seventh incident regions ie1 to ie7. As shown in Fig. 6, at an arbitrary moment, the area on the reflecting surface 79a of the scanning device 70 that is irradiated with light emitted from one of the plurality of collimating lenses 67a to 67g is received from a plurality of The area on the reflecting surface 79a of the scanning device 70 illuminated by the light emitted from the collimating lens other than the one of the straight lenses at least partially does not overlap. In particular, in the illustrated example, the plurality of collimating lenses 67a to 67g are arranged away from each other on the first imaginary plane vfp1, and the traveling directions of the lights from the corresponding optical fibers 64a to 64g are parallel to each other in the same direction. Chemical. Therefore, as shown in FIG. 6, none of the first to seventh incident regions ie1 to ie7 overlap. That is, in different light sources The light generated by 62a to 62g is incident on a different area of the reflecting surface 79a at an arbitrary timing. In other words, the reflecting surface 79a can be dispersed and used effectively.

Further, the arrangement of the emission ends 64ay to 64gy and the collimator lenses 67a to 67g corresponding to the optical fibers 64a to 64g is emitted from one of the plurality of collimating lenses 67a to 67g at any instant. The area ie1 on the reflecting surface 79a of the scanning device 70 irradiated with light is located inside an imaginary circumference or elliptical circumference c3 on the reflecting surface 79a, and is received from among a plurality of collimating lenses 67a to 67g. Each of the regions ie2 to ie7 on the reflecting surface 79a of the scanning device 70, which is irradiated with light emitted from each of the collimating lenses 67b to 67g other than the collimating lens 67a, is located on an imaginary circumference or an elliptical circumference c3. More specifically, the first incident region ie1 on the reflecting surface 79a irradiated with the light emitted from the first collimating lens 67a is positioned inside an imaginary circumference or an elliptical circumference c3 on the reflecting surface 79a. The second to seventh incident regions ie2 to ie7 on the reflecting surface 79a of the scanning device 70 that are irradiated with light emitted from each of the second to seventh collimating lenses 67b to 69g are surrounded by an imaginary circumference or The ellipse is c3 passing through. When the first imaginary plane vfp1 in which the collimating lenses 67a to 67g are arranged is not parallel to the reflecting surface 79a, if the centers of the second to seventh collimating lenses 67b to 69g are on the circumference, the second ~ The seventh incident region ie2~ie7 will be located on the elliptical circumference.

In particular, in the illustrated embodiment, the reflecting surface irradiated with light emitted from one of the collimating lenses 67a is received at an arbitrary timing. The area ie1 on the 79a is larger than the respective areas ie2 to ie7 on the reflection surface 79a which is irradiated with light emitted from each of the collimator lenses 67b to 67g other than the one collimator lens 67a. More specifically, at an arbitrary moment, the area of the first incident area ie1 on the reflecting surface 79a that is irradiated with the light emitted from the first collimating lens 67a is received from the second to seventh collimating lenses 67b. The area of each region ie2 to ie7 on the reflecting surface 79a irradiated by the light emitted by each of ~67g is also large. According to this aspect, as will be described later, even in the low output state in which only the first light source 62a is used, the speckle can be effectively made inconspicuous.

Next, the optical element 50 will be described. The optical element 50 has an optical path control function that directs incident light for each region to a specific direction corresponding to the position of the region. The optical element 50 described here corrects the traveling direction of the incident light for each region so as to face the predetermined region LZ. This area becomes the illuminated area LZ. In other words, the light from the irradiation device 60 that is irradiated to each of the regions in which the incident surface of the optical element 50 is planarly divided passes through the optical element 50, and illuminates at least a portion of the overlapping region.

As an example, in the example shown in FIGS. 1 and 8, the optical element 50 may be configured to include a lens array 51 formed in accordance with an incident direction of light from the irradiation device 60. Here, the "lens array" is an aggregate of small lenses which may be referred to as a unit lens, and functions as an element which deflects the traveling direction of light by refraction or reflection. In the illustrated example, the optical element 50 diffuses light incident on each region corresponding to each unit lens 51a, and is incident on at least the entire illuminated area LZ. area. That is, the optical element 50 diffuses light incident from the irradiation device 60 to each region, thereby illuminating the same illuminated region LZ.

In a specific example shown in FIG. 8, the optical element 50 includes a lens array 51 configured as a fly-eye lens in which a unit lens 51a composed of a convex lens is laid, and a collecting lens 52. Or a field lens is disposed opposite to the lens array 51. In the optical element 50 of FIG. 8, the lens array 51 is disposed on the most light-incident side of the optical element 50, and receives light from the irradiation device 60. Each unit lens 51a constituting the lens array 51 can converge light incident on the optical path of the light ray constituting a predetermined diverging beam. Then, the condensing lens 52 is disposed on the surface which is formed by the convergence point of each unit lens 51a, and the light from each convex lens is directed toward the illumination region LZ. In particular, according to the condensing lens 52, the light from each convex lens can be directed only to the same illumination region LZ, and the illumination light from each direction can be superimposed on the illumination region LZ. Further, in order to control the divergence angle of the divergent light irradiated from the irradiation device 60, an adjustment means such as a collimator lens may be provided on the optical path before entering the lens array 51.

Further, in another specific example shown in FIG. 9, the optical element 50 has a second lens array 53 disposed therebetween in addition to the lens array 51 and the condensing lens 52 shown in FIG. In the example shown in FIG. 9, the second lens array 53 is also configured as a fly-eye lens formed by laying a unit lens 53a composed of a convex lens, like the lens array 51. The second lens array 53 is disposed such that each unit lens 53a is located at a convergence point of each unit lens 51a of the lens array 51. Figure 9 light In the element 50, each unit lens 53a of the second lens array 53 diverges light from the lens array 51. Then, the divergent light from each unit lens 53a of the second lens array 53 is superimposed on the illumination region LZ by the condensing lens 52.

Next, the spatial light modulator 30 will be described. The spatial light modulator 30 is configured to overlap the illuminated area LZ. Further, the spatial light modulator 30 is illuminated by the illumination device 40 to form a modulated image. Light from the illumination device 40 will only illuminate the entire area of the illuminated area LZ as described above. Therefore, the incident surface of the spatial light modulator 30 is preferably of the same shape and size as the illuminated region LZ that is illuminated by the illumination device 40. This is because in this case, light from the illumination device 40 can be utilized with high utilization efficiency to form a modulated image.

The spatial light modulator 30 is not particularly limited, and various well-known spatial light modulators can be utilized. For example, a spatial light modulator capable of forming a modulated image without using polarized light, such as a digital micromirror device (DMD), or a transmissive liquid crystal using polarized light to form a modulated image A microdisplay or a reflective LCOS (Liquid Crystal On Silicon) is used as the spatial light modulator 30.

As in the example shown in FIG. 1, when the spatial light modulator 30 is a transmissive liquid crystal microdisplay, the spatial light modulator 30 that is illuminated by the illumination device 40 in a planar manner is used to make the same dimming light for each pixel. The selective transmission thereby forms a modulated image on the screen of the display constituting the spatial light modulator 30. The modulated image thus obtained will eventually be projected by light. The system 25 is projected onto the screen 15 in equal or zoomed magnification. In this way, the viewer can observe the image projected onto the screen 15. The screen 15 can be configured as a transmissive screen or as a reflective screen.

Next, the operation of the illumination device 40, the projection device 20, and the projection display device 10 composed of the above configuration will be described.

First, the irradiation device 60 irradiates the optical element 50 with the same dimming so as to scan on the optical element 50. Specifically, the light sources 62a to 62g of the light source device 61 generate the same dimming light in a specific wavelength band. The light generated by each of the light sources 62a to 62g propagates through the optical fibers 64a to 64g corresponding to the light sources 62a to 62g, and is emitted from the emission ends 64ay to 64gy of the optical fibers 64a to 64g. The light emitted from the optical fibers 64a to 64g is parallel-beamed by the collimating lenses 67a to 67g disposed at positions facing the emitting ends 64ay to 64gy. Then, in the above manner, the illumination device 60 irradiates the parallel light beam of a large amount of light toward the scanning device 70.

As described above, in the present embodiment, each of the light sources 62a to 62g is partitioned, and the generated light is transmitted and formed into a parallel beam. According to the present embodiment as described above, the light irradiated from the light source device 61 to the scanner device 70 can be beamed in parallel with high precision with high precision.

When a large amount of light emitted from a plurality of light sources is combined and transmitted by the optical fiber 99, as shown in Fig. 18, the area of the emitting end 99y of the optical fiber 99 must also be large. In this case, the traveling direction of the outgoing light from the optical fiber 99 is directed to a specific angular range corresponding to the configuration of the optical fiber 99. However, the light emitted from the optical fiber 99 will The optical path of the divergent beam diverging in the direction within the specific angle range is emitted from each position of the emitting end 99y. That is to say, the emitted light from the optical fiber 99 is strictly a divergent planar light. In this case, the optical axis of the light emitted from the optical fiber 99 can be adjusted by the collimator lens 98 disposed to face the emitting end 99y of the optical fiber 99, but the optical paths of all the light cannot be paralleled with high precision. Chemical. On the other hand, according to the light source device 61 of the present embodiment shown in Fig. 2 or Fig. 3, different optical fibers 64a to 64g are used for the respective light sources 62a to 62g, so that it is not necessary to make the output ends 64ay to 64gy of the optical fibers 64a to 64g. Into a large diameter. Therefore, the light emitted from the light source device 61 can be parallelized to be beamed with high precision.

Next, the same dimming light that travels from the light source device 61 to the scanning device 70 is reflected by the scanning device 70 on the reflecting surface 79a of the reflecting element 75 to be changed in the traveling direction. The orientation of the reflecting surface 79a changes periodically. As a result, as can be understood from FIGS. 5 and 7, the incident position of the same dimming on the optical element 50 also periodically changes.

The same dimming of the respective areas incident on the optical element 50 is superimposed on the illuminated area LZ by the optical path adjustment function in the optical element 50. That is, the same dimming light incident from the irradiation device 60 to each region of the optical element 50 is diffused or widened in the optical element 50, and is incident on the entire region of the illuminated region LZ. Accordingly, the illumination device 60 can illuminate the illuminated region LZ with the same dimming.

As shown in FIG. 1, in the projection device 20, a spatial light modulator 30 is disposed at a position overlapping the illuminated region LZ of the illumination device 40. Therefore, the spatial light modulator 30 will be exposed by the illumination device 40. Illumination selectively transmits the same dimming light at each pixel, thereby forming an image. This image is projected onto the screen 15 by the projection optical system 25. The same dimming light projected onto the screen 15 is diffused and recognized by the viewer as an image.

In addition, the same dimming light projected onto the screen interferes with the spread, causing the spots to be generated. On the other hand, according to the illumination device 40 described here, as will be described later, the speckle can be made extremely ineffective.

In order to make the spots become inconspicuous, it is generally considered effective to multiplex the parameters of polarization, phase, angle, and time to increase the modality. The modality referred to herein refers to a speckle pattern that has no correlation with each other. For example, in the case where a plurality of laser light sources project the same dimming light from different directions to the same screen, the number of laser light sources is equal to the number of modalities present. In addition, when the same dimming light from the same laser light source is projected from different directions to the screen at separate times, the number of times the incident direction of the dimming light changes during the time when the human eye cannot subdivide is equal to the existing mode. State number. When there are a plurality of such modalities, the interference patterns of light are averaged without overlapping and, as a result, the spots that are expected to be observed by the observer's eyes become inconspicuous.

In the illumination device 40 described above, the same dimming is applied to the optical element 50 so as to be scanned on the optical element 50. Further, the same dimming light incident from the irradiation device 60 to each region of the optical element 50 illuminates the entire illumination region LZ with the same dimming light, but the illumination directions for illuminating the same illumination of the illuminated region LZ are different from each other. Again, due to the same dimming The area on the incident optical element 50 changes over time, so that the direction of incidence of the same dimming to the illuminated area LZ also changes over time.

When the light-receiving area LZ is used as a reference, the same dimming light is incident on each area in the illumination area LZ without interruption, but the incident direction thereof constantly changes as indicated by an arrow A1 in Fig. 1 . As a result, the light of each pixel constituting the image formed by the transmitted light of the spatial light modulator 30 is projected onto the screen 15 while temporally changing the optical path as indicated by an arrow A2 in FIG. Specific location.

For the above reasons, according to the illumination device 40 described above, the incident direction of the dimming light changes with time at each position on the screen 15 on which the image is displayed, and the change is a speed that the human eye cannot subdivide, and as a result, for the person For the eyes, it is observed that the scatter pattern of the same dimming that is not correlated is multiplexed. Therefore, the spots generated corresponding to the respective scatter patterns are overlapped and averaged, and are observed by the observer. As a result, the observer who observes the image displayed on the screen 15 can make the spectacle extremely ineffective.

In addition, among the conventional spots observed by humans, in addition to the spots on the screen side due to the scattering of the same dimming light on the screen 15, it is also possible to cause the projection device side due to the scattering of the same dimming light before being projected onto the screen. Spots. The speckle pattern generated on the side of the projection device is projected onto the screen 15 by the spatial light modulator 30, and may also be recognized by the observer. However, according to the present embodiment, the same dimming is continuously scanned on the optical element 50, and the same dimming of the respective areas incident on the optical element 50 causes the respective illumination to overlap with the spatial light modulator 30. The entire area of the illuminated area LZ. That is to say, the optical element 50 forms a new wavefront different from the conventional wave surface on which the speckle pattern has been formed, and illuminates the illuminated area LZ in a complicated and uniform manner, and illuminates through the spatial light modulator 30. Screen 15. By forming a new wavefront with such an optical element 50, the speckle pattern produced on the side of the projection device becomes invisible.

Further, the scanning device 70 that changes the optical path of the light from the light source device 61 has a reflection element 75 including a reflection member 79 that reflects light from the light source device 61. The reflection member 79 of the reflection element 80 rotates around the rotation axis Ra1 that is non-parallel to the normal direction nd1 of the reflection surface 79a. Therefore, when the reflection member 79 rotates, the orientation of the reflection surface 79a changes with time, and the change in the orientation of the reflection surface 79a has periodicity. Therefore, the traveling direction of the light reflected by the reflecting surface 79a changes over time, and the change in the traveling direction of the reflected light may have a periodicity. In particular, according to such a reflection element 75, the optical path can be largely changed by a lightweight configuration and simple control. Further, the reflection element 75 does not largely change the occupied space as the orientation of the reflecting surface 79a changes. Therefore, according to the present embodiment, scanning of incident light can be performed across a wide area of the optical element 50 while saving space.

In addition, as can be understood from FIG. 5, in the case of using the illustrated scanning device 70, the scanning path of the light incident on the optical element 50 from the illumination device 60 onto the optical element 50 becomes a circular shape as indicated by the arrow ARx. . That is to say, in the same manner as the scanning device 70 of the simple configuration At this time, the incident position of the light on the optical element 50 can be widely distributed, in other words, it is greatly widened. In this way, the size of the optical element 50 can be effectively utilized, and the range of the incident angle of the illumination light toward each position of the illumination region LZ can be greatly widened. As a result, the spots can be made inconspicuous.

Further, according to the present embodiment, among the combinations of the scanning devices 70 that rotate the reflecting surface 79a around the rotation axis Ra1 that is inclined with respect to the normal direction nd1 of the reflecting surface 79a, the light source device 61 has: a plurality of light sources 62a-62g; and a plurality of optical fibers 64a-64g, respectively, corresponding to the respective light sources 62a-62g for transmitting light emitted from the corresponding light source; and a plurality of collimating lenses 67a-67g, and each of the optical fibers 64a~64g are respectively arranged correspondingly to adjust the optical path of the light emitted from the corresponding optical fiber. According to the present embodiment, the region on the reflecting surface 79a of the scanning device 70 that is irradiated with light emitted from any one of the plurality of collimating lenses 67a to 67g is received at an arbitrary moment, and is subjected to a plurality of The area on the reflecting surface 79a illuminated by the light emitted by the collimating lens other than the one of the collimating lenses 67a to 67g can be designed to be at least partially non-overlapping. That is, the light from the light source device 61 can be dispersedly irradiated to a wide area of the reflecting surface 79a. Therefore, the power density of the light received by the reflecting surface 79a can be lowered, whereby the deterioration of the reflecting surface 79a can be effectively prevented. Further, since the effective use of the reflecting surface 79a can be achieved, the reflecting surface 79a can be downsized. As a result, the high-output illuminating device 40 can be effectively miniaturized.

Further, according to the present embodiment as described above, the light emitted from the plurality of light sources 62a to 62g can be scattered from the respective output ends 64ay to 64gy of the plurality of optical fibers 64a to 64g without being combined. Therefore, the aperture area of the output ends 64ay to 64gy of each of the optical fibers 64a to 64g can be reduced, in other words, the point of light emitted from the emission ends 64ay to 64gy of the respective optical fibers 64a to 64g can be reduced as compared with the case of using the combined light. The diameter is reduced. Therefore, the traveling directions of the light beams emitted from the optical fibers 64a to 64g can be parallelized with higher precision by the collimator lenses 67a to 67g. As a result, the traveling direction of the light can be controlled with higher precision, and the illuminated area can be illuminated with higher efficiency.

In other words, according to the present embodiment, the scanning device 70 that is sufficiently miniaturized can accurately control the traveling direction of the high-output light from the light source device 61 while suppressing the deterioration of the reflecting surface 79a. As a result, the desired region LZ can be brightly illuminated with high precision from the desired direction by the illumination device 40.

Further, according to the present embodiment, as shown in Fig. 4, the output end 64ay of one of the plurality of optical fibers 64a to 64g is located in an imaginary circumference or an elliptical circumference c2 located on the second imaginary plane vfp2. The respective output ends 64by to 64gy of the optical fibers 64b to 64g other than the one of the plurality of optical fibers 64a to 64g are located on the one imaginary circumference or the elliptical circumference c2. With the configuration of the optical fibers 64a to 64g, one of the plurality of collimating lenses 67a to 67g is located in an imaginary circumference or elliptical circumference c1 of the first imaginary plane vfp1, and plural Collimating lenses 67a~67g The collimating lenses 67b to 67g other than the aforementioned one of the collimating lenses 67a are located on the aforementioned imaginary circumference or elliptical circumference c1. Further, with the configuration of the light source device 61 described above, as shown in FIG. 6, the scanning device 70 that is irradiated with light emitted from any one of the plurality of collimating lenses 67a to 67g is irradiated at an arbitrary timing. The incident area ie1 on the reflecting surface 79a is located in an imaginary circumference or elliptical circumference c3 on the reflecting surface 79a, and is received by one of the plurality of collimating lenses 67a to 67g. Each of the incident regions ie2 to ie7 on the reflecting surface 79a of the scanning device 70 irradiated by the light emitted from each of the other collimating lenses 67b to 67g is located on the aforementioned one of the virtual circumferences or the elliptical circumference c3. In the present embodiment as described above, the light from the light source device 61 is more uniformly dispersed and irradiated onto the reflecting surface 79a. Therefore, deterioration of the reflecting surface 79a can be avoided more efficiently, and more efficient use of the reflecting surface 79a can be achieved.

Further, according to the present embodiment, as shown in Fig. 4, one of the collimating lenses 67a is larger than the collimating lenses 67b to 67g other than the one of the collimating lenses 67a. As a result, as shown in FIG. 6, the incident region ie1 on the reflecting surface 69a that is irradiated with the light emitted from one of the collimating lenses 67a is received at an arbitrary timing, and is received from any one of the collimating lenses 67a. Each of the regions ie2 to ie7 on the reflecting surface 69a irradiated by the light emitted from each of the collimating lenses 67b to 67g is large. According to this embodiment as described above, the light from the light source device 61 can be irradiated more uniformly to the reflection surface 79a of a limited size.

Further, according to the embodiment, the light source device 61 has A plurality of light sources 62a to 62g and optical fibers 64a to 64g and collimating lenses 67a to 67g are provided corresponding to the respective light sources 62a to 62g. When such a light source device 61 is used, the output of the entire light source device 61 can be adjusted by opening and closing the outputs of the respective light sources 62a to 62g. Further, according to the present embodiment, the one of the collimating lenses 67a is larger than the other collimating lenses 67b to 67g, and the incident on the reflecting surface 79a that is irradiated with the light of the one collimating lens 67a is incident. The area ie1 is larger than the incident areas ie2 to IE7 on the reflecting surface 79a that is irradiated by the light of each of the other collimating lenses 67b to 67g. According to this embodiment, the scanning range on the optical element 50 scanned by the light of one of the collimating lenses 67a is higher than that of the light passing through the respective collimating lenses 67b to 67g. The scan range on 50 is still large. 7 shows that the scanning range se1 on the optical element 50 scanned by the light passing through the first collimating lens 67a is larger than that on the optical element 50 scanned by the light passing through the second and third collimating lenses 67b, 67c. The scanning range se2 and se3 are still large. Therefore, in the case where only one of the plurality of light sources 62a to 62g is used, the light is still scanned over a large area on the optical element 50. That is, according to the present embodiment, in the case where only one of the plurality of light sources 62a to 62g is used, light can be incident on a wider region located at the center of the reflecting surface 79a, and thus In the utilization mode, light is still incident on a wide area se1 of the optical element 50. In this way, regardless of the number of light sources 62a to 62g used, in other words, it is necessary to fully perform the speckle reduction function without depending on the size of the output.

As described above, according to the present embodiment, the scanning device 70 that is sufficiently miniaturized can accurately control the traveling direction of the high-output light from the light source device 61 while suppressing the deterioration of the reflecting surface 79a. As a result, the desired region LZ can be illuminated with high precision from the desired direction by the illumination device 40.

Various modifications can be added to the above embodiment. An example of the modification will be described below with reference to the drawings. In the following description, the same components as those in the above-described embodiments are denoted by the same reference numerals as those in the above-described embodiments, and the description thereof will not be repeated.

The arrangement of the optical fibers 64a to 64g and the arrangement of the collimator lenses 67a to 67g and the arrangement of the incident regions ie1 to IE7 of the light from the respective light sources 62a to 62g on the reflecting surface 79a are merely examples. As an example, various changes can be made as shown in FIGS. 10 and 11 from the viewpoint of making light more uniformly incident on each region on the reflecting surface 79a.

Fig. 10 is a view corresponding to Fig. 4, showing a state in which a modification of the collimator lens array 66 is observed along the optical axis direction of the collimator lenses 67a to 67g. In the example shown in Fig. 10, a plurality of collimating lenses 67a to 67f are located on an imaginary circumference or elliptical circumference c1 of the first imaginary plane vfp1. In particular, in the example shown in Fig. 10, the first to sixth collimating lenses 67a to 67f have the same planar shape and are arranged at equal intervals on the circumference c1. Further, in Fig. 10, in addition to the respective collimator lenses 67a to 67f, first to sixth optical fibers corresponding to the respective collimator lenses 67a to 67f are disclosed. The position of the output end 64a~64fy of 64a~64f. In the example shown in Fig. 10, when viewed from the optical axis direction of the collimator lenses 67a to 67g, the output ends 64ay to 64fy of the optical fibers 64a to 64f corresponding to the collimator lenses 67a to 67f are arranged in the collimating lens. The positions where the optical axes of 67a to 67f overlap. That is, the output ends 64ay to 64fy of the plurality of optical fibers 64a to 64f are located on an imaginary circumference or elliptical circumference c2 located on the imaginary plane vfp2. In particular, in the example shown in Fig. 10, the respective output ends 64ay to 64fy of the first to sixth optical fibers 64b to 64f are arranged at equal intervals on the circumference c2.

Further, in Fig. 11, the first to sixth incident regions ie1 to IE6 on the reflecting surface 79a through which the light of each of the collimating lenses 67a to 67g shown in Fig. 10 can pass are disclosed. Similarly, in the example shown in Fig. 11, at an arbitrary moment, the area on the reflecting surface 79a of the scanning device 70 irradiated with light emitted from one of the plurality of collimating lenses 67a to 67f is received and received from The area on the reflecting surface 79a of the scanning device 70 illuminated by the light emitted from the collimating lens other than the one of the plurality of collimating lenses 67a to 67f at least partially does not overlap. Further, in the example shown in Fig. 10, the first to sixth collimating lenses 67a to 67f are arranged apart from each other on the first imaginary plane vfp1, and are provided from the corresponding first to sixth optical fibers 64a to 64f. The lights are beamed parallel to each other in the same direction. Therefore, as shown in FIG. 11, none of the first to sixth incident regions ie1 to ie6 overlap. Further, in the example shown in Fig. 11, the incident region ie1 to IE6 on the reflecting surface 79a of the scanning device 70 which is irradiated with light emitted from each of the plurality of collimating lenses 67a to 67f is applied at an arbitrary moment. Located at An imaginary circumference or an elliptical circumference c3 on the reflecting surface 79a.

In the example shown in Figs. 10 and 11, as in the above embodiment, the light generated by the different light sources 62a to 62g enters the regions i1 to IE6 which are different from each other on the reflecting surface 79a at an arbitrary timing. In other words, the light can be dispersed in a wide range of the reflecting surface 79a, and the effective use of the reflecting surface 79a can be utilized, whereby the same operational effects as those of the above embodiment can be exhibited.

As still another modification, in the above embodiment, the scanning device 70 is described as having one reflection element 75, but the invention is not limited thereto. As an example, as will be mainly described below with reference to FIGS. 12 to 14 , the scanning device 70 may have a second reflecting element 80 including a reflecting surface 79a from the reflecting element 75 in addition to the reflecting element 75. The second light reflecting surface 84a is reflected by the light.

In the example shown in Figs. 12 to 14, the second reflection element 80 can be configured in the same manner as the reflection element 75 described above. In other words, the second reflecting element 80 includes the second reflecting member 84 and the second reflecting surface 84a, and the second driving device 81 that rotationally drives the second reflecting member 84. The second driving device 81 has a housing 82 and a shaft member 83 that is rotatably held by the housing 82. The shaft member 83 is rotatable about the second rotation axis Ra2 that coincides with the axial direction. The second reflection member 84 is attached to the shaft member 83 and is rotatable about the second rotation axis Ra2 together with the shaft member 83. However, the second reflecting surface 84a is not orthogonal to the rotation axis Ra2. In other words, the normal direction nd2 of the second reflecting surface 84a is not parallel to the rotation axis Ra2, and is opposite to the rotation axis Ra2. tilt. Therefore, when the second reflection member 84 rotates around the rotation axis line Ra2, the second reflection surface 84a changes its orientation. At this time, when the rotation of the second reflection member 84 is a constant speed, the second reflection surface 84a periodically changes the orientation around the second virtual orthogonal plane vp2 orthogonal to the rotation axis Ra2.

Here, the fluctuation of the orientation of the reflection surface 79a of the reflection element 75 and the change of the orientation of the second reflection surface 84a of the second reflection element 80 may be designed to be synchronized. In other words, one of the orientation of the reflecting surface 79a and the orientation of the second reflecting surface 84a may be designed to face a predetermined orientation in response to the other direction. In particular, the reflecting surface 79a and the second reflecting surface 84a may be designed such that the direction of the reflecting surface 79a and the direction of the second reflecting surface 84a are parallel to each other.

In the example shown in Figs. 12 and 13, the rotation axis Ra1 of the reflection surface 79a and the rotation axis Ra2 of the second reflection surface 84a are parallel. Further, the rotation direction about the rotation axis Ra1 of the reflection surface 79a is the same direction as the rotation direction about the rotation axis Ra2 of the second reflection surface 84a. Further, the rotation period of the reflection surface 79a is the same as the rotation period of the second reflection surface 84a. As a result, the reflecting surface 79a and the second reflecting surface 84a are maintained in a state of being parallel to each other. The rotation direction about the rotation axis Ra1 of the reflection surface 79a is the rotation direction of the reflection surface 79a in the case where the reflection surface 79a is observed from the side of one side to the other side along the rotation axis Ra1 (in FIG. 13). The arrow AR1) is rotated in the direction of the rotation axis Ra2 of the second reflecting surface 84a, and is rotated forward from the side of the one along the rotation axis Ra2 parallel to the rotation axis Ra1. The rotation direction of the second reflection surface 84a in the case where the second reflection surface 84a is observed on the other side (arrow AR2 in Fig. 13).

An example of a method of controlling the orientation of the reflecting surface 79a and the second reflecting surface 84a by the controller 72 is disclosed in FIG. In the example shown in Fig. 14, once the operation of the scanning device 70 is started, first, the phase of the driving device 76 that rotationally drives the reflecting surface 79a is detected. At the same time, the phase of the second driving device 81 that rotationally drives the second reflecting surface 84a is detected. Then, the controller 72 detects the phase of the drive unit 76 and the amount of misalignment of the phase of the second drive unit 81. The controller 72 adjusts the drive unit 76 and the second drive unit 81 in accordance with the amount of misalignment of the detected phase so that the phase of the drive unit 76 and the phase of the second drive unit 81 are the same. As a result, the reflecting surface 79a of the reflecting element 75 and the second reflecting surface 84a of the second reflecting element 80 are kept parallel, and are respectively driven by the corresponding driving devices 76, 81.

In the control method shown in FIG. 14, the phase of the drive device 76 and the phase of the second drive device 81 are checked, for example, continuously or at regular intervals during the operation of the scanner device 70. When the phase between the driving devices 76 and 81 is shifted, the misalignment is eliminated, and the phase of the driving device 76 and the phase of the second driving device 81 are matched. Accordingly, the reflecting surface 79a and the second reflecting surface 84a are maintained in a state of being parallel to each other while being rotationally driven.

As described above, when the reflecting surface 79a and the second reflecting surface 84a are kept in parallel, the traveling direction of the light which is advanced from the second reflecting surface 84a is parallel to the traveling direction of the light incident on the reflecting surface 79a. On the other hand, the collimator lens array 66 of the light source device 61 is fixed, and the light emitted from the light source device 61 always faces the reflection element 75 from the fixed direction. That is, the traveling direction of the light from the light source device 61 incident on the reflecting surface 79a is always fixed. Therefore, the light reflected by the second reflecting surface 84a of the second reflecting element 80 always advances in a fixed direction. In the illustrated example, light is always incident from the illumination device 60 toward the optical element 50 from a fixed direction. That is to say, the light from the illuminating device 60 is incident on the optical element 50 so as to follow the optical path of the light constituting the parallel beam.

As described above, when the emitted light from the irradiation device 60 is in a fixed direction, the use of the emitted light, for example, transmission, becomes very easy. Further, unlike the case of diverging the light beam, the width of the optical path caused by the passage of the emitted light from the illumination device 60 is fixed, and the variation of the optical path width does not occur. Therefore, it is possible to effectively prevent the illuminating device 40 from becoming large. Further, the optical element 50 that is irradiated with light from the irradiation device 60 bends the incident light toward the respective regions in different directions, thereby guiding the incident light to the illuminated region LZ as the illumination light. Moreover, if the incident direction toward the optical element 50 is fixed, the design and manufacture of the optical element 50 can be simplified.

Further, from the viewpoint of avoiding an increase in size of the apparatus, the reflecting surfaces 79a and 84a which are rotatable about the axes Ra1 and Ra2 which are inclined with respect to the normal directions nd1 and nd2 are preferably corresponding to the scanning paths. A contour with a round shape. According to this example, the reflecting surfaces 79a, 84a of the scanning devices 75, 80 can be effectively utilized while avoiding the large size of the scanning device 70. Chemical. Further, it is preferable that the second reflecting surface 84a of the second scanning device 80 is larger than the reflecting surface 79a of the scanning device 75. According to this example, the light expanded by the scanning device 75 and the optical path can be effectively reflected by the second scanning device 80. That is to say, the above-described useful optical path control can be performed by the scanning device 70, and the size of the scanning device 70 can be prevented from being increased.

As still another modification, in the above embodiment, the light source device 61 is disclosed as an example in which a plurality of light sources 62a to 62g emitting light of the same wavelength band are included. However, the present invention is not limited thereto, and the light source device 61 may be designed to emit light. A plurality of light sources of light of different wavelength bands. In this case, the illuminated area LZ can be illuminated according to the color of the light that cannot be reproduced by a single light source. Further, the light source device 61 may include a plurality of light sources that emit light of a wavelength band corresponding to each of the three primary colors. In this example, the synthesized light that is irradiated to the illuminated area is subdivided according to each wavelength band and is incident on different spatial light modulators 30 according to each wavelength band, or different wavelength bands are used. The light is emitted in a time division and the spatial light modulator 30 forms an image in a time-dependent manner in accordance with the wavelength band of the incident light, whereby the projection device 20 can project a color image.

Further, in the above embodiment, the optical element 50 is disclosed as being exemplified by the lens array 51, but the invention is not limited thereto. As shown in FIG. 15, the optical element 50 can also be designed to include a hologram recording medium 57. In the example shown in Fig. 15, the light scanned by the irradiation device 60 and scanned on the hologram recording medium 57 is incident on the hologram recording medium 57 at an incident angle satisfying the diffraction condition of the hologram recording medium 57. Various regions. Incident from the irradiation device 60 to each region of the hologram recording medium 57 The light is diffracted by the hologram recording medium 57, respectively, to illuminate at least a portion of the area overlapping each other. In the example shown in Fig. 15, the light incident on each region of the hologram recording medium 57 from the irradiation device 60 is diffracted by the hologram recording medium 57 to illuminate the same illuminated region LZ. For example, the light incident from the irradiation device 60 to each region of the hologram recording medium 57 may be designed to overlap the illumination region LZ to reproduce the image of the diffusion plate.

Further, in the above-described embodiment, the spatial light modulator 30 is disposed in the illumination region LZ illuminated by the illumination device 40, but the present invention is not limited to this example. As an example, in the example shown in FIGS. 16 and 17, the incident surface 37a of the homogenizing optical system 37 is disposed in the illumination region LZ. That is, light from the illumination device 40 is incident on the homogenizing optical system 37. The light incident on the homogenizing optical system 37 is transmitted through the homogenizing optical system 37 while being totally reflected and totally reflected, and is emitted from the homogenizing optical system 37. The illuminance at each position on the exit surface 37b of the uniformizing optical system 37 is uniformized. As the homogenizing optical system 37, for example, an integrating rod can be used.

In the example shown in Fig. 16, the spatial light modulator 30 is disposed to directly face the exit surface 37b of the homogenizing optical system 37, and the spatial light modulator 30 is illuminated with a uniform amount of light. On the other hand, in the example shown in FIG. 17, a relay optical system 35 is disposed between the homogenizing optical system 37 and the spatial light modulator 30. In this example, the photo-optical system 35 includes the first lens 35a and the second lens 35b in this order along the optical path. By the relay optical system 35, the position where the spatial light modulator 30 is disposed becomes a conjugated surface with the emitting surface 37b of the homogenizing optical system 37. Therefore, as shown in Figure 17 In the example, the spatial light modulator 30 will also be illuminated with a uniform amount of light. Further, it is also possible to form an intermediate image in the illuminated region LZ by the illumination device 40 without using the homogenizing optical system 37, and the position of the intermediate image is the optical integrator 37 of FIG. At the position corresponding to the exit surface 37b, the optical optical system 35 then maps the intermediate image to the spatial light modulator 30.

Further, in the above embodiment, the drive unit 76 as the reflection element 75 of the scanner device 70 is an electric motor having the shaft member 78. However, the present invention is not limited to this example, and various devices, mechanisms, components, members, and the like that can be connected to the reflecting member 79 can be used as the driving device 76. For example, an outer rotor motor, a shaftless motor, a frameless motor, or the like can be used as the driving device 76 that drives the reflecting member 79.

Further, in the above-described embodiment, an example in which the illumination device 40 is incorporated in the projection device 20 and the projection display device 10 is disclosed. However, the present invention is not limited thereto, and can be applied to various applications such as a lighting device for a scanner.

Further, although a few modifications have been described above in the above embodiment, it is needless to say that a plurality of modifications can be combined as appropriate.

10‧‧‧Projection image display device

15‧‧‧ screen

20‧‧‧projection device

25‧‧‧Projection Optical System

26‧‧ ‧ field lens

27‧‧‧Projection lens

30‧‧‧Space light modulator

40‧‧‧Lighting device

45‧‧‧Optical module

50‧‧‧Optical components

51‧‧‧ lens array

52‧‧‧ Concentrating lens

60‧‧‧ illumination device

61‧‧‧Light source device

70‧‧‧ scanning device

72‧‧‧ Controller

75‧‧‧Reflecting device

76‧‧‧ drive

77‧‧‧Shell

78‧‧‧Axis components

79‧‧‧reflecting members

62a~62g‧‧‧ light source

64a~64g‧‧‧ fiber

64ax~64gx‧‧‧Optical end of fiber 64a~64g

64ay~64gy‧‧‧Optical end of fiber 64a~64g

67a~67c‧‧‧ collimating lens

79a‧‧‧reflecting surface

A1, A2‧‧‧ arrows

LZ‧‧‧ illuminated area

Nd1‧‧‧ normal direction of the reflecting surface 79a

Ra1‧‧‧ axis of rotation

Vp1‧‧‧1st hypothetical orthogonal plane

Claims (18)

An illumination device comprising: an optical element; an illumination device that irradiates the optical element with light on the optical element; the illumination device includes a light source device that emits light; and the scanning device has a reflective member, the reflective member a reflecting surface that reflects light from the light source device; the reflecting member is rotatable about a rotation axis that is inclined with respect to a normal direction of the reflecting surface, and the light source device includes: a plurality of light sources; The optical fibers are arranged to correspond to the respective light sources respectively for the light emitted from the corresponding light source to propagate; the plurality of collimating lenses are arranged to respectively correspond to the respective optical fibers to adjust the optical path of the light emitted from the corresponding optical fibers. . The illuminating device according to claim 1, wherein a region of the reflecting surface of the scanning device that is irradiated with light emitted from one of the plurality of collimating lenses is received from the aforementioned The area of the aforementioned reflecting surface of the scanning device illuminated by the light emitted by the collimating lens other than the one of the plurality of collimating lenses is at least partially offset. The lighting device of claim 1, wherein Each region on the reflecting surface of the scanning device that is irradiated with light emitted from each of the plurality of collimating lenses is positioned on an imaginary circumference or elliptical circumference on the reflecting surface. The illuminating device according to claim 1, wherein the region of the reflecting surface of the scanning device that is irradiated with light emitted from one of the plurality of collimating lenses is in the region of An imaging device located on an imaginary circumference or an elliptical circumference of the reflecting surface and irradiated with light emitted from each of the collimating lenses other than the one of the plurality of collimating lenses Each of the aforementioned reflecting surfaces is located on an imaginary circumference or an elliptical circumference. The illuminating device according to claim 4, wherein the region on the reflecting surface that is irradiated with light emitted from one of the collimating lenses is subjected to a collimating lens other than the collimating lens. Each area on the aforementioned reflecting surface illuminated by the light emitted by each of them is also large. The illuminating device of claim 1, wherein the plurality of collimating lenses are located on an imaginary circumference or an elliptical circumference. The illuminating device of claim 1, wherein one of the plurality of collimating lenses is located in an imaginary circumference or an elliptical circumference, and the foregoing one of the plurality of collimating lenses A collimating lens other than a collimating lens is located on an imaginary circumference or elliptical circumference as described above. The illuminating device of claim 7, wherein the one of the collimating lenses is more than any one of the collimating lenses The straight lens is still large. The illuminating device according to claim 1, wherein the output ends of the plurality of optical fibers are located on an imaginary circumference or an elliptical circumference. The illumination device of claim 1, wherein the emission end of one of the plurality of optical fibers is located in an imaginary circumference or an elliptical circumference, and the one of the plurality of optical fibers is other than the one of the plurality of optical fibers. Each of the exit ends of the optical fiber is located on an imaginary circumference or an elliptical circumference. A light source device comprising: a plurality of light sources; a plurality of optical fibers disposed corresponding to the respective light sources for transmitting light emitted from the corresponding light source; and a plurality of collimating lenses arranged to correspond to the respective optical fibers respectively; Adjust the optical path of the light emitted from the corresponding fiber. The light source device of claim 11, wherein the plurality of collimating lenses are located on an imaginary circumference or an elliptical circumference. The light source device of claim 11, wherein one of the plurality of collimating lenses is located in an imaginary circumference or an elliptical circumference, and the foregoing one of the plurality of collimating lenses A collimating lens other than a collimating lens is located on an imaginary circumference or elliptical circumference as described above. a light source device according to claim 13 of the patent application, In the above, one of the collimating lenses is larger than each of the collimating lenses except one of the collimating lenses. The light source device of claim 11, wherein the output ends of each of the plurality of optical fibers are located on an imaginary circumference or an elliptical circumference. The light source device of claim 11, wherein the emission end of one of the plurality of optical fibers is located in an imaginary circumference or an elliptical circumference, and the one of the plurality of optical fibers is other than the one of the plurality of optical fibers Each of the exit ends of the optical fiber is located on an imaginary circumference or an elliptical circumference. A projection device comprising: the illumination device according to any one of claims 1 to 10; wherein the spatial light modulator is illuminated by light from the illumination device. The projection device of claim 17, further comprising: a relay optical system that relays light from the illumination device to the spatial light modulator; the relay optical system The intermediate image formed by the illumination device is mapped onto the spatial light modulator.