JP6551044B2 - Wavelength conversion element, lighting device and projector - Google Patents

Description

  The present invention relates to a wavelength conversion element, a lighting device and a projector.

In recent years, as a lighting device for a projector, one that generates illumination light by combining fluorescent light generated using blue light emitted from a semiconductor laser and blue diffused light is known (for example, Patent Document 1) reference).
In this lighting device, a diffusion layer that generates blue diffused light and a phosphor layer that generates fluorescent light are disposed on one surface of a rotating wheel. Blue diffused light from the diffusion layer and fluorescent light from the phosphor layer are incident on the pickup lens, respectively.

JP 2012-73489 A

  By the way, in the said illuminating device, the height of the upper surface of a diffusion layer and the height of the upper surface of a fluorescent substance layer differ. Since the height of the top surface of the diffusion layer is higher than the height of the top surface of the phosphor layer, the pickup lens whose distance to the phosphor layer is optimized may interfere with the diffusion layer.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a wavelength conversion element, an illumination device, and a projector in which interference between a pickup lens and a diffusion layer is prevented.

According to the first aspect of the present invention, there is provided a wavelength conversion element including a rotator that is rotatable around a rotation axis, the rotator including a substrate having a first surface and the first surface. A first optical element provided on the upper part; and a second optical element. The first optical element includes at least a first arc-shaped region centered on the rotation axis and emits light. A second surface and a third surface facing the second surface, wherein the second optical element includes at least a second arc-shaped region centered on the rotation axis, and light And a fifth surface opposite to the fourth surface, and the thickness of the first optical element is smaller than the thickness of the second optical element, The substrate is provided on the third surface side of the first optical element, and the second surface and the fourth surface face the same side. When the third surface is used as a height reference, the difference between the height of the second surface and the height of the fourth surface is the thickness of the first optical element and the thickness of the second optical element. in most smaller than the difference, when viewed from the direction parallel to the rotation axis, wherein the substrate, the wavelength converting element is mounted inside or outside of the second optical element is provided.

  According to the wavelength conversion element of the first aspect, the difference in height between the second surface (upper surface) of the first optical element and the fourth surface (upper surface) of the second optical element is reduced. Therefore, for example, when the lens member is disposed on the upper side of the second surface, interference between the lens member and the fourth surface of the second optical element can be prevented.

In the first aspect, the second optical element is provided above the first surface, and the height of the region of the first surface where the first optical element is provided is It is good also as a structure larger than the height of the area | region in which the said 2nd optical element of the 1st surface is provided.
According to this configuration, the difference in height between the second surface of the first optical element and the fourth surface of the second optical element can be easily and reliably reduced.

In the first aspect, the second optical element is provided above the first surface, and a spacer is provided between the first optical element and the first surface. It may be
According to this configuration, the difference in height between the second surface of the first optical element and the fourth surface of the second optical element can be easily and reliably reduced.

In the first aspect, the second optical element has a ring shape, and the second optical element is provided outside the substrate when viewed from a direction parallel to the rotation axis. It may be
A drive device is required to rotationally drive the rotating body. It is desirable that the rotating body be easy to attach to the drive device. According to this configuration, since the substrate is disposed at the center of the rotating body, the driving device that rotates the rotating body is attached to the substrate. If it is a board | substrate, since it is easy to select the material with which attachment processing of a drive device is easy, manufacture of a rotary body becomes easy.

In the first aspect, the first optical element includes a wavelength conversion layer, the second optical element includes a diffusing member, and when viewed from a direction parallel to the rotation axis, the first optical element is It may be configured to be provided outside the second optical element.
According to this configuration, it is possible to reduce the energy of the excitation light irradiated per rotation to a specific region of the wavelength conversion layer, so that the temperature of the wavelength conversion layer is hardly increased.

In the first aspect, the substrate may have a ring shape, and the substrate may be provided outside the second optical element when viewed from a direction parallel to the rotation axis.
According to this structure, since it has a ring-shaped board | substrate, a rotary body can be reduced in weight.

In the first aspect, the semiconductor device may further include a connection member for connecting the substrate to the second optical element.
According to this configuration, the second optical element can be reliably fixed to the substrate.

In the first aspect, at least one of the substrate and the second optical element may include a fitting portion for connecting the substrate to the second optical element.
According to this configuration, the second optical element and the substrate can be simply and reliably fixed.

  According to a second aspect of the present invention, there is provided a light source device for emitting a light beam, a wavelength conversion element according to the first aspect, a drive device for rotating the rotating body around the rotation axis, and a first pickup A lighting device comprising a lens and a second pickup lens, wherein a radius of the first arc-shaped area is different from a radius of the second arc-shaped area, and a part of the light beam bundle Is incident on the first optical element, the other part of the light flux is incident on the second optical element, and the light emitted from the first optical element is the first optical element. The present invention provides an illumination device in which the light that is incident on the pickup lens and the light emitted from the second optical element is incident on the second pickup lens.

  Since the illumination device according to the second aspect includes the above-described wavelength conversion element, interference between the first pickup lens and the second optical element can be prevented.

  According to the third aspect of the present invention, a light source device that emits a light bundle, the wavelength conversion element according to the first aspect, a drive device that rotates the rotating body around the rotation axis, a pickup lens, The rotating body is configured such that the light flux is incident on the first optical element and the second optical element in time series as the rotating body rotates. An illumination device is provided in which light emitted from the first optical element and light emitted from the second optical element are incident on the pickup lens.

  Since the illuminating device which concerns on a 3rd aspect is provided with the said wavelength conversion element, it can prevent interference with a pickup lens and a 2nd optical element.

  According to a fourth aspect of the present invention, there is provided an illumination device according to the second or third aspect, a light modulation device for forming image light by modulating light from the illumination device according to image information, and And a projection optical system for projecting image light.

  Since the projector according to the fourth aspect includes the illumination device, the occurrence of malfunction due to interference is prevented.

FIG. 2 is a top view showing an optical system of the projector according to the first embodiment. The figure which shows schematic structure of an illuminating device. (A) is a front view of a rotary body, (b) is A1-A1 arrow sectional drawing of (a). (A) is a front view of the wavelength conversion element of a 1st modification, (b) is B1-B1 arrow sectional drawing of (a). (A) is a front view of the wavelength conversion element of a 2nd modification, (b) is C1-C1 arrow sectional drawing of (a). (A), (b) is a block diagram which shows the fixing structure of a diffusion member. (A) is a front view of the rotation board | substrate provided with the connection member, (b) is D1-D1 arrow sectional drawing of (a). (A) is a front view of the wavelength conversion element of a 3rd modification, (b) is E1-E1 arrow sectional drawing of (a). Sectional drawing of the wavelength conversion element of a 4th modification. (A), (b) is sectional drawing which shows the structure which concerns on the modification of a rotation board | substrate. The figure which shows schematic structure of the illuminating device which concerns on 2nd Embodiment. FIG. 10 is a top view showing an optical system of a projector according to a third embodiment. (A) is a front view of the rotating body of the present embodiment (b) is a cross-sectional view taken along line F1-F1 of (a).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the drawings used in the following description, in order to make the features easy to understand, the features that are the features may be enlarged for the sake of convenience, and the dimensional ratio of each component may be limited to the same as the actual Absent.

First Embodiment
<Projector>
An example of a projector according to the present embodiment will be described. The projector of this embodiment is a projection type image display device that displays a color image on a screen (projected surface) SCR. The projector uses three liquid crystal light modulation devices corresponding to red, green, and blue light. The projector uses, as a light source of the illumination device, a semiconductor laser capable of obtaining light with high brightness and high output.

FIG. 1 is a top view showing an optical system of a projector according to the present embodiment.
As shown in FIG. 1, the projector 1 includes an illumination device 2 that emits illumination light WL, and a color separation optical system 3 that separates the illumination light WL from the illumination device 2 into red light LR, green light LG, and blue light LB. A light modulation device 4R, a light modulation device 4G, a light modulation device 4B, and light modulation devices 4R, 4G, 4B, which modulate the respective color lights LR, LG, LB according to the image information to form the image light of each color. And a projection optical system 6 for projecting the synthesized image light from the synthesis optical system 5 toward the screen SCR.

  The illumination device 2 mixes excitation light (blue light) emitted from a semiconductor laser and fluorescent light (yellow light) generated by exciting a phosphor with the excitation light, thereby illuminating light (white light). WL is obtained. The illumination device 2 emits the illumination light WL toward the color separation optical system 3.

  The color separation optical system 3 includes a first dichroic mirror 7a and a second dichroic mirror 7b, a first total reflection mirror 8a, a second total reflection mirror 8b, a third total reflection mirror 8c, and a first A relay lens 9a and a second relay lens 9b are schematically provided.

  Among these, the first dichroic mirror 7a has a function of separating the illumination light WL from the illumination device 2 into the red light LR and the other color lights LG and LB, and transmits the separated red light LR. The other color lights LG and LB are reflected. On the other hand, the second dichroic mirror 7b has a function of separating the other color lights LG and LB into the green light LG and the blue light LB, reflects the separated green light LG, and transmits the blue light LB. .

  The first total reflection mirror 8a is disposed in the optical path of the red light LR, and reflects the red light LR transmitted through the first dichroic mirror 7a toward the light modulation device 4R. On the other hand, the second total reflection mirror 8b and the third total reflection mirror 8c are disposed in the optical path of the blue light LB, and guide the blue light LB transmitted through the second dichroic mirror 7b to the light modulation device 4B. The green light LG is reflected from the second dichroic mirror 7b toward the light modulation device 4G.

  The first relay lens 9a and the second relay lens 9b are disposed downstream of the second dichroic mirror 7b in the optical path of the blue light LB. The first relay lens 9a and the second relay lens 9b have a function to compensate for the optical loss of the blue light LB due to the optical path length of the blue light LB becoming longer than the optical path length of the red light LR and the green light LG. doing.

  Each of the light modulation devices 4R, 4G, 4B comprises a liquid crystal panel, and modulates each color light LR, LG, LB according to image information while corresponding to each color light LR, LG, LB. Form image light. A polarizing plate (not shown) is disposed on each of the incident side and the emission side of each of the light modulation devices 4R, 4G, 4B.

  In addition, on the incident surface side of each of the light modulation devices 4R, 4G, and 4B, a field lens 10R, a field lens 10G, and a field for collimating the color lights LR, LG, and LB incident on the respective light modulation devices 4R, 4G, and 4B. A lens 10B is disposed.

  The combining optical system 5 includes a cross dichroic prism, combines the image light of each color from each of the light modulation devices 4R, 4G, and 4B, and emits the combined image light toward the projection optical system 6.

  The projection optical system 6 includes a projection lens group, and enlarges and projects the image light combined by the combining optical system 5 toward the screen SCR. As a result, an enlarged color image is displayed on the screen SCR.

<Lighting device>
Next, the lighting device 2 will be described.
FIG. 2 is a view showing a schematic configuration of the lighting device 2.
As shown in FIG. 2, the illumination device 2 includes a wavelength conversion element 20, a motor M, an array light source 11, a collimator optical system 12, an afocal optical system 13, a first retardation plate 19a, A homogenizer optical system 14, a polarization separation element 15, a first pickup lens 16, a reflection mirror 17, a second pickup lens 18, a second retardation plate 19b, and a uniform illumination optical system 23 are provided. ing.
The array light source 11 corresponds to the “light source device” in the claims, and the motor M corresponds to the “drive device” in the claims.

  The array light source 11 is composed of a plurality of semiconductor lasers 11a. Specifically, the plurality of semiconductor lasers 11a are arranged in an array in a plane orthogonal to the optical axis ax1 of the array light source 11.

  Here, the optical axis of the first pickup lens 16 is defined as an optical axis ax2. The optical axis ax1 and the optical axis ax2 are in the same plane and are orthogonal to each other. Further, the optical axis of the second pickup lens 18 is defined as an optical axis ax3. The optical axis ax1 and the optical axis ax3 are in the same plane and are orthogonal to each other.

On the optical axis ax1, the array light source 11, the collimator optical system 12, the afocal optical system 13, the first retardation plate 19a, the homogenizer optical system 14, the polarization separation element 15, and the reflection mirror 17 Are arranged in this order.
On the optical axis ax2, the wavelength conversion element 20, the first pickup lens 16, the polarization separation element 15, and the uniform illumination optical system 23 are arranged in this order.
On the optical axis ax3, the wavelength conversion element 20, the second pickup lens 18, and the reflection mirror 17 are arranged in this order.

  The semiconductor laser 11a emits blue light (emission intensity peak: about 445 nm) B made of laser light as excitation light. The blue light B emitted from each semiconductor laser 11a is linearly polarized light. The blue light B emitted from the array light source 11 enters the collimator optical system 12.

  The collimator optical system 12 converts the blue light B emitted from the array light source 11 into parallel light, and from a plurality of collimator lenses 12 a arranged in an array corresponding to each semiconductor laser 11 a Become. Then, the blue light B converted into parallel light by passing through the collimator optical system 12 enters the afocal optical system 13.

  The afocal optical system 13 includes, for example, a convex lens 13a and a concave lens 13b. The afocal optical system 13 reduces the diameter of a light flux K including a plurality of blue lights B emitted from the array light source 11.

  The first retardation plate 19a is, for example, a half-wave plate that can be rotated. The blue light B emitted from each semiconductor laser 11a is linearly polarized light. By appropriately setting the rotation angle of the first retardation plate 19a (1/2 wavelength plate), the light beam K transmitted through the first retardation plate 19a can be converted into the S polarization component and P component for the polarization separation element 15. It can be set as the light which contains a polarization component with a predetermined ratio. The light beam K that has passed through the first retardation plate 19 a is incident on the homogenizer optical system 14.

The homogenizer optical system 14 includes, for example, a first lens array 14a and a second lens array 14b.
The homogenizer optical system 14 cooperates with the first pickup lens 16 or the second pickup lens 18 to make a plurality of small luminous fluxes emitted from each of the plurality of small lenses of the first lens array 14 a to obtain the wavelength conversion element 20. They are superimposed on each other on a predetermined area (described later). As a result, the light intensity distribution of the blue light B irradiated on the wavelength conversion element 20 is made uniform (so-called top hat distribution).

The light beam K from the homogenizer optical system 14 is incident on the polarization separation element 15 having wavelength selectivity.
The polarization separation element 15 has a polarization separation function for separating the light beam K into an S polarization component and a P polarization component for the polarization separation element 15. Specifically, the polarization separation element 15 reflects the S-polarized light beam BLs in the light beam K and transmits the P-polarized light beam BLp in the light beam K. Further, the polarization separation element 15 has a color separation function that transmits fluorescent light Y, which will be described later, having a wavelength band different from that of the light beam K, regardless of the polarization state.

  The light beam BLs, which is the S-polarized component, is reflected by the polarization separation element 15 and enters the first pickup lens 16. The first pickup lens 16 has a function of condensing the light beam BLs toward a phosphor layer 31 (to be described later) of the wavelength conversion element 20 and a function of picking up the fluorescent light Y emitted from the phosphor layer 31. As the first pickup lens 16, for example, an achromatic lens is preferably used.

  Note that the first pickup lens 16 is disposed in the vicinity of the phosphor layer 31. The distance between the first pickup lens 16 and the phosphor layer 31 is set according to the focal length of the first pickup lens 16 with respect to the wavelength of the fluorescent light Y.

  On the other hand, the light ray BLp, which is a P-polarization component, passes through the polarization separation element 15, is reflected by the reflection mirror 17, and enters the second retardation plate 19b.

  The second retardation plate 19 b is composed of a 1⁄4 wavelength plate. The light beam BLp is converted into a circularly polarized light beam BLc by passing through the second retardation plate 19b. The light beam BLc that has passed through the second retardation plate 19b is incident on the second pickup lens 18.

  The second pickup lens 18 has a function of condensing the light beam BLc toward a later-described diffusing member 32 of the wavelength conversion element 20 and a function of picking up the light beam BLc ′ made of diffused light emitted from the diffusing member 32. Have.

  The second pickup lens 18 is disposed in the vicinity of the diffusing member 32. The distance between the second pickup lens 18 and the diffusion member 32 is set in accordance with the focal length of the second pickup lens 18 with respect to the wavelength of the diffused light.

  The wavelength conversion element 20 includes a rotating body 20A that can rotate around the rotation axis O. The rotating body 20A includes, for example, a rotating substrate 50 made of a metal material, a phosphor layer 31, and a diffusion member 32.

As shown in FIG. 3 (b), the phosphor layer 31 is provided on the upper surface 50 a of the rotary substrate 50. In the present embodiment, the phosphor layer 31 is a layer containing, for example, (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Ce, which is a YAG phosphor. The phosphor layer 31 converts the blue light BLs into yellow fluorescent light Y by being excited by blue light BLs as excitation light described later. The thickness of the phosphor layer 31 is, for example, several hundred μm.

In the present embodiment, the diffusion member 32 is provided on the upper surface 50 a of the rotary substrate 50.
The diffusion member 32 diffuses and reflects the light beam BLc. As the diffusion member 32, it is preferable to use one that performs Lambertian reflection of light incident on the diffusion member 32.
The diffusion member 32 includes, for example, a base material 33 made of a light transmissive material such as a transparent resin, and a plurality of diffusion particles 34 dispersed in the base material 33 and having light diffusibility. The thickness of the diffusion member 32 is, for example, 0.5 mm.

3A is a front view of the rotating body 20A, and FIG. 3B is a cross-sectional view taken along arrow A1-A1 in FIG. 3A.
As shown in FIG. 3A, the phosphor layer 31 and the diffusing member 32 are provided concentrically around the rotation axis O, and the phosphor layer 31 is provided outside the diffusing member 32. There is. The phosphor layer 31 and the diffusion member 32 each have a ring shape.

  A region where the blue light BLs is incident on the rotating body 20A is referred to as a light incident region 31A. Since the rotating body 20A rotates around the rotation axis O, the light incident region 31A moves on the rotating body 20A so as to draw an arc around the rotation axis O. The phosphor layer 31 is provided so as to include a region where the light incident region 31A moves. That is, the phosphor layer 31 includes at least a first arc-shaped area corresponding to the locus of the light incident area 31A.

  A region where the light beam BLc enters the rotating body 20A is referred to as a light incident region 32A. The light incident area 32A moves on the rotating body 20A so as to draw an arc around the rotation axis O. The diffusion member 32 is provided so as to include a region in which the light incident region 32A moves. That is, the diffusing member 32 includes at least a second arc-shaped region corresponding to the locus of the light incident region 32A.

  The radius R1 of the first arc-shaped area (the distance between the rotation axis O and the outer diameter of the first arc-shaped area) is the radius R2 of the second arc-shaped area (the rotation axis O and the outside of the second arc-shaped area) Larger than the distance to the diameter).

As shown in FIG. 3B, the phosphor layer 31 has an upper surface 31a that emits fluorescent light Y and a lower surface 31b that faces the upper surface 31a. The diffusing member 32 has an upper surface 32a that emits diffused light, and a lower surface 32b that faces the upper surface 32a. The upper surface 31a of the phosphor layer 31 and the upper surface 32a of the diffusing member 32 face the same side.
The upper surface 31 a and the lower surface 31 b correspond to the “second surface” and the “third surface” in the claims, respectively, and the upper surface 32 a and the lower surface 32 b correspond to the “fourth surface” in the claims. And "fifth surface".

  Generally, the thickness of the diffusion member is thicker than the thickness of the phosphor layer. Also in the present embodiment, as described above, the thickness H1 (several hundred μm) of the phosphor layer 31 is smaller than the thickness H2 (0.5 mm) of the diffusion member 32. That is, the thickness H2 of the diffusing member 32 is thicker than the thickness H1 of the phosphor layer 31.

The first pickup lens 16 is disposed close to the upper surface 31 a of the phosphor layer 31.
Suppose that the upper surface 32a of the diffusing member 32 is positioned above the upper surface 31a of the phosphor layer 31 by a difference between the thicknesses H2 and H1. Since the phosphor layer 31 and the diffusion member 32 are provided concentrically around the rotation axis O, the lower end of the first pickup lens 16 may interfere with the upper surface 32 a of the diffusion member 32.

  In the present embodiment, the recess 51 is provided on the top surface 50 a of the rotary substrate 50. The phosphor layer 31 is provided in the region 50a1 outside the recess 51 in the upper surface 50a, and the diffusion member 32 is provided in the region 50a2 inside the recess 51 in the upper surface 50a.

  Based on this configuration, the difference H between the height of the upper surface 31 a of the phosphor layer 31 and the height of the upper surface 32 a of the diffusion member 32 when the lower surface 31 b of the phosphor layer 31 is the reference of the height is The height of the lower surface 32 b of the diffusion member 32 is set to be smaller than the difference between the thickness H 1 and the thickness H 2 of the diffusion member 32. That is, the lower surface 32 b of the diffusing member 32 is positioned below the lower surface 31 b of the phosphor layer 31. Thereby, the interference between the first pickup lens 16 and the upper surface 32a of the diffusing member 32 is prevented.

  In the present embodiment, since the rotating body 20A rotates, the position of the light incident region 31A in the phosphor layer 31 can be changed over time. Similarly, the position of the light incident region 32A in the diffusing member 32 can be changed over time. Therefore, the phosphor layer 31 and the diffusion member 32 are prevented from being damaged due to the light always entering the same position.

  In the present embodiment, the phosphor layer 31 is located outside the diffusion member 32. Therefore, as compared with the case where the phosphor layer 31 is located inside the diffusion member 32, the energy of the light beam BLs irradiated per rotation on a specific region of the phosphor layer 31 can be reduced. . Thereby, the temperature rise of the wavelength conversion layer is reduced.

  Returning to FIG. 2, the fluorescent light Y emitted from the phosphor layer 31 passes through the first pickup lens 16 and the polarization separation element 15.

  On the other hand, the light beam BLc ′ composed of the diffused light reflected by the diffusing member 32 passes through the second retardation plate 19 b again through the second pickup lens 18. Thus, the circularly polarized light beam BLc ′ becomes S-polarized diffused blue light BLs ′. The diffused blue light BLs ′ is reflected by the reflection mirror 17 and enters the polarization separation element 15. The diffused blue light BLs ′ is reflected by the polarization separation element 15. In this way, the diffused blue light BLs ′ and the fluorescent light Y are combined to generate white illumination light WL.

  The illumination light WL is incident on the uniform illumination optical system 23. The uniform illumination optical system 23 includes a first lens array 120, a second lens array 130, a polarization conversion element 140, and a superimposing lens 141.

  The first lens array 120 has a plurality of first small lenses 120 a for dividing the illumination light WL into a plurality of partial light beams. The plurality of first small lenses 120a are arranged in a matrix in a plane orthogonal to the optical axis ax3.

  The second lens array 130 includes a plurality of second small lenses 130 a corresponding to the plurality of first small lenses 120 a of the first lens array 120. The plurality of second small lenses 130a are arranged in a matrix in a plane orthogonal to the optical axis ax3. The second lens array 130, together with the superimposing lens 141, forms an image of each first small lens 120a of the first lens array 120 in the vicinity of the image forming area of each of the light modulation devices 4R, 4G, 4B.

  The polarization conversion element 140 converts each partial light beam divided by the first lens array 120 into linearly polarized light.

  The superimposing lens 141 condenses the partial light fluxes from the polarization conversion element 140 and superimposes them in the vicinity of the image forming area of each of the light modulation devices 4R, 4G, and 4B.

As described above, according to the wavelength conversion element 20 of the present embodiment, the difference in height between the upper surface 31a of the phosphor layer 31 and the upper surface 32a of the diffusing member 32 can be reduced. Therefore, interference between the first pickup lens 16 disposed on the upper surface 31a of the phosphor layer 31 and the upper surface 32a of the diffusing member 32 can be prevented. Moreover, since the phosphor layer 31 and the diffusing member 32 are disposed on the rotating substrate 50, the wavelength conversion element 20 is compared with the case where the phosphor layer 31 and the diffusing member 32 are provided on different rotating substrates. Thus, the wavelength conversion element 20 can be reduced in size.
Moreover, since the illuminating device 2 of this embodiment is provided with the said wavelength conversion element 20, interference with the 1st pick-up lens 16 and the diffusion member 32 is prevented, and size reduction of the illuminating device 2 is easy.
Therefore, the projector 1 to which such an illuminating device 2 is applied is small in size and has high reliability in which an operation failure due to interference is prevented.

First Modified Example of First Embodiment
Subsequently, a first modified example of the first embodiment will be described. The difference between this modification and the first embodiment is the structure of the wavelength conversion element, and the other configurations are common. Therefore, below, the same code | symbol is attached | subjected about the same structure as 1st Embodiment, and the detailed description is abbreviate | omitted.

FIG. 4A is a front view of the wavelength conversion element 40 according to the first modification, and FIG. 4B is a cross-sectional view taken along arrow B1-B1 in FIG.
As shown in FIG. 4A, the phosphor layer 31 and the diffusing member 32 are provided concentrically around the rotation axis O, and the phosphor layer 31 is provided inside the diffusing member 32. There is. The phosphor layer 31 and the diffusion member 32 each have a ring shape.

  In the present embodiment, a recess 149 is provided on the outer peripheral edge of the upper surface 150 a of the rotating substrate 150. The phosphor layer 31 is provided in a region 150a1 of the upper surface 150a outside the concave portion 149, and the diffusion member 32 is provided in a region 150a2 of the upper surface 150a inside the concave portion 149.

  Also in this modification, the lower surface 32b of the diffusion member 32 can be positioned below the lower surface 31b of the phosphor layer 31, so the first pickup lens 16 (see FIG. 2) and the upper surface 32a of the diffusion member 32. Interference with can be prevented.

Second Modified Example of First Embodiment
Subsequently, a second modified example of the first embodiment will be described. The difference between this modification and the first embodiment is the structure of the wavelength conversion element, and the other configurations are common. Therefore, below, the same code | symbol is attached | subjected about the same structure as 1st Embodiment, and the detailed description is abbreviate | omitted.

Fig.5 (a) is a front view of the wavelength conversion element 41 of this modification, and FIG.5 (b) is sectional drawing by the C1-C1 arrow of Fig.5 (a).
As shown in FIG. 5A, when viewed from a direction parallel to the rotation axis O, the phosphor layer 31 has a ring shape. As shown in FIGS. 5A and 5B, the wavelength conversion element 41 (rotating body 41 </ b> A) has a ring-shaped rotating substrate 151. The phosphor layer 31 is provided on the upper surface 151 a of the rotary substrate 151. A circular through hole 155 is formed at the center of the rotary substrate 151.

  In this modification, the diffusing member 132 has a disk shape and is attached to the through hole 155 of the rotating substrate 151. In the diffusion member 132, for example, the side surface 133 is adhesively fixed to the through hole 155. In the present modification, the motor M is attached to the diffusion member 132.

  Also in this modification, when the lower surface 31 b of the phosphor layer 31 is the reference of the height, the difference between the height of the upper surface 31 a of the phosphor layer 31 and the height of the upper surface 132 a of the diffusion member 132 is The height of the lower surface 132b of the diffusing member 132 is set to be smaller than the difference between the thickness and the thickness of the diffusing member 132. The height of the lower surface 132 b of the diffusion member 132 can be adjusted by adjusting the height of the fixing position of the diffusion member 132 and the through hole 155.

Also in this modification, the lower surface 132b of the diffusing member 132 can be positioned below the lower surface 31b of the phosphor layer 31, so the first pickup lens 16 (see FIG. 2) and the upper surface 132a of the diffusing member 132 Can prevent interference with
Further, according to the configuration of the present modification, the rotating substrate 151 is ring-shaped, and thus the rotating body 41A can be reduced in weight.

  In addition, since the rotating body 41A rotates, it is desirable that the diffusion member 132 and the through hole 155 be firmly fixed to each other. In order to firmly fix the diffusion member 132 and the through hole 155, the structure shown in FIG. 6 can be exemplified.

For example, in the form shown in FIG. 6A, the inner wall surface 155a of the through hole 155 is a tapered surface that narrows the inner diameter of the hole downward. Further, the diffusing member 132 has a tapered shape in which the side surface 133 corresponds to the tapered shape of the inner wall surface 155a.
According to this configuration, the diffusing member 132 and the rotating substrate 151 are firmly fixed to each other when the side surface 133 is fitted to the through hole 155. That is, the inner wall surface 155a of the through hole 155 and the side surface 133 of the diffusing member 132 correspond to a “fitting portion” in the claims.

Alternatively, in the form shown in FIG. 6B, the through hole 155 includes a first hole 152 and a second hole 153. The first hole 152 has a larger inner diameter than the second hole 153. Further, the side surface 133 of the diffusion member 132 includes a first portion 133a and a second portion 133b. The outer diameter of the first portion 133a is larger than the outer diameter of the second portion 133b.
Specifically, the first portion 133 a has an outer diameter corresponding to the inner diameter of the first hole 152. The second portion 133 b has an outer diameter corresponding to the inner diameter of the second hole portion 153.

  According to this configuration, the diffusion member 132 and the rotary substrate 151 are firmly fixed to each other by the side surface 133 of the diffusion member 132 and the through hole 155 being fitted to each other. The first hole portion 152 and the second hole portion 153 of the through hole 155, and the first portion 133a and the second portion 133b of the diffusion member 132 correspond to the "fitting portion" in the claims. .

  In the configuration shown in FIG. 5, when the through hole 155 and the side surface 133 of the diffusion member 132 are bonded and fixed, a gap may occur due to the component tolerance of each member. In that case, there is a possibility that adhesion fixation will become difficult. On the other hand, as shown in FIG. 7, a connection member 154 that holds the diffusion member 132 may be provided on the lower surface 151 b side of the rotating substrate 151.

FIG. 7A is a front view of the rotary substrate 151 provided with the connection member 154, and FIG. 7B is a cross-sectional view taken along the arrow D1-D1 in FIG. The illustration of the motor M is omitted in FIG.
As shown in FIGS. 7A and 7B, the connection member 154 includes a first extension member 154a extending downward from the lower surface 150b of the rotary substrate 151 along the inner wall surface 155a of the through hole 155, and a first extension member. And a second extending member 154b extending from the protruding member 154a toward the rotation axis O side.

  The first extension member 154 a holds the side surface 133 of the diffusion member 132. The second extending member 154 b holds the lower surface 134 of the diffusing member 132. The connection member 154 holds the side surface 133 and the lower surface 132 b of the diffusion member 132. According to this configuration, even when a gap is generated between the through hole 155 and the side surface 133 of the diffusing member 132 due to component tolerances, the diffusing member 132 and the rotating substrate 151 can be firmly fixed to each other by the connecting member 154.

Third Modified Example of First Embodiment
Subsequently, a third modification of the first embodiment will be described. The difference between this modification and the first embodiment is the structure of the wavelength conversion element, and the other configurations are common. Therefore, in the following, the same reference numerals are given to the same configuration as that of the first embodiment, and the detailed description thereof is omitted.

FIG. 8A is a front view of the wavelength conversion element 42 of this modification, and FIG. 8B is a cross-sectional view taken along arrow E1-E1 in FIG.
As shown in FIG. 8A, when viewed from a direction parallel to the rotation axis O, the wavelength conversion element 42 (rotating body 42 </ b> A) has a ring-shaped diffusing member 232. A circular through hole 233 is formed at the center of the diffusion member 232.

In the present modification, the disk-shaped rotary substrate 50 is attached to the through hole 233 of the diffusion member 232. The side surface 50 b of the rotary substrate 50 is adhesively fixed to the through hole 233. In the present modification, the motor M is attached to the lower surface 50 c of the rotating substrate 50.
As shown in FIG. 8 (b), the phosphor layer 31 is disposed on the upper surface 50 a of the rotary substrate 50. The phosphor layer 31 and the diffusing member 232 are provided concentrically around the rotation axis O, and the phosphor layer 31 is provided on the inner side of the diffusing member 232.
The phosphor layer 31 and the diffusion member 232 each have a ring shape.

  Also in this modification, when the lower surface 31 b of the phosphor layer 31 is the reference of the height, the difference between the height of the upper surface 31 a of the phosphor layer 31 and the height of the upper surface 232 a of the diffusion member 232 is The height of the lower surface 232 b of the diffusion member 232 is set to be smaller than the difference between the thickness and the thickness of the diffusion member 232. The height of the lower surface 232b of the diffusing member 232 can be adjusted by adjusting the height of the fixed position between the rotating substrate 50 and the through hole 233.

Also in this modification, the lower surface 232b of the diffusion member 232 can be positioned below the lower surface 31b of the phosphor layer 31, so the first pickup lens 16 (see FIG. 2) and the upper surface 232a of the diffusion member 232 Can prevent interference with
Further, according to the configuration of this modification, the motor M and the rotating body 42 </ b> A can be fixed via the rotating substrate 50. If it is the rotation board 50, it will be easy to select the material in which the attachment process of the motor M is easy. Therefore, according to the present modification, the manufacturing of the rotating body 42A is facilitated.

(Fourth modification of the first embodiment)
Subsequently, a fourth modified example of the first embodiment will be described. The difference between this modification and the first embodiment is the structure of the wavelength conversion element, and the other configurations are common. Therefore, below, the same code | symbol is attached | subjected about the same structure as 1st Embodiment, and the detailed description is abbreviate | omitted.

FIG. 9 is a cross-sectional view of the wavelength conversion element 43 of this modification.
As shown in FIG. 9, the wavelength conversion element 44 includes a rotating body 44A rotatable around the rotation axis O. The rotating body 44A in this modification includes a rotating substrate 52, a phosphor layer 31, a diffusion member 32, and a spacer SP.

  In the present modification, the rotary substrate 52 is composed of a plate whose upper surface 52a and lower surface 52b are parallel. The diffusion member 32 is directly disposed on the upper surface 52 a of the rotary substrate 52. The spacer SP is provided between the phosphor layer 31 and the upper surface 52a.

  In the present modification, when the lower surface 31 b of the phosphor layer 31 is the reference of the height, the difference between the height of the upper surface 31 a of the phosphor layer 31 and the height of the upper surface 32 a of the diffusion member 32 is the thickness of the phosphor layer 31. The height of the lower surface 32b of the diffusion member 32 is set so as to be smaller than the difference between the thickness of the diffusion member 32 and the thickness of the diffusion member 32. Specifically, the lower surface 32 b of the diffusing member 32 is positioned below the lower surface 31 b of the phosphor layer 31 by the spacer SP.

  According to the present modification, by using the spacer SP, the height of the upper surface 31a of the phosphor layer 31 can be brought close to the height of the upper surface 32a of the diffusing member 32 easily and reliably, so that the first pickup Interference between the lens 16 (see FIG. 2) and the top surface 32 a of the diffusion member 32 can be prevented.

  The difference between the height of the upper surface 31 a of the phosphor layer 31 and the height of the upper surface 32 a of the diffusion member 32 may be adjusted by processing the rotary substrate 52 instead of the spacer SP.

  For example, the central portion of the rotary substrate 52 shown in FIG. 10A is bent downward with respect to the outer peripheral edge portion by sheet metal processing (for example, drawing processing).

  Specifically, the second region 52a2 that is the support region of the diffusing member 32 is pushed down below the first region 52a1 that is the support region of the phosphor layer 31 in the upper surface 52a. Thereby, the first area 52a1 is higher than the second area 52a2.

  The central portion of the rotating substrate 52 shown in FIG. 10B is bent upward with respect to the outer peripheral edge portion by sheet metal processing (for example, drawing processing).

  Specifically, the first area 52a1 which is a support area of the phosphor layer 31 in the upper surface 52a is pushed up above the second area 52a2 which is a support area of the diffusion member 32. Thereby, the first region 52a1 is higher than the second region 52a2.

  Also in the configuration shown in FIGS. 10A and 10B, the height of the upper surface 31a of the phosphor layer 31 can be made closer to the height of the upper surface 32a of the diffusion member 32, so the first pickup lens 16 Interference between the diffusion member 32 (see FIG. 2) and the upper surface 32a of the diffusion member 32 can be prevented.

Second Embodiment
Next, the lighting device according to the second embodiment will be described. Although the illuminating device of 1st Embodiment mentioned the case where the reflection type wavelength conversion element 20 was provided as an example, the points with which the illuminating device of this embodiment is equipped with a transmission type wavelength conversion element differ. In the following description, the same reference numerals are given to the same configurations and members as in the first embodiment, and the detailed description thereof is omitted.

FIG. 11 is a view showing a schematic configuration of a lighting device 2A of the present embodiment.
As shown in FIG. 11, the illumination device 2A includes a wavelength conversion element 60, a motor M, an array light source 11, a collimator optical system 12, an afocal optical system 13, a first retardation plate 19a, The homogenizer optical system 14, the first polarization separation element 61, the first condensing lens 62, the reflecting mirror 63, the second condensing lens 64, the first pickup lens 16, and the reflecting mirror 67; A second pickup lens 18, a light combining element 69, and a uniform illumination optical system 23 are provided.

  Here, the optical axis of the array light source 11 is taken as an optical axis ax1, and the optical axis of the first pickup lens 16 is taken as an optical axis ax2. The optical axis ax1 and the optical axis ax2 are in the same plane and are orthogonal to each other. Further, the optical axis of the second pickup lens 18 is defined as an optical axis ax3. The optical axis ax1 and the optical axis ax3 are in the same plane and are orthogonal to each other.

On the optical axis ax1, the array light source 11, the first polarization separation element 61, and the reflection mirror 63 are arranged in this order.
On the optical axis ax2, the first polarization separation element 61, the first condenser lens 62, the wavelength conversion element 60, the first pickup lens 16, and the reflection mirror 67 are arranged in this order. ing.
On the optical axis ax3, the reflecting mirror 63, the second condenser lens 64, the wavelength conversion element 60, the second pickup lens 18, the light combining element 69, and the uniform illumination optical system 23 are arranged in this order. They are arranged side by side.

The light beam K from the homogenizer optical system 14 is incident on the first polarization separation element 61.
The first polarization separation element 61 has a polarization separation function for separating the light beam K into an S polarization component and a P polarization component for the first polarization separation element 61.

  The light beam BLs that is the S-polarized component is reflected by the first polarization separation element 61 and is incident on the first condenser lens 62. The first condensing lens 62 condenses the light beam BLs toward a phosphor layer 31 described later of the wavelength conversion element 20.

  On the other hand, the light beam BLp, which is a P-polarized component, passes through the first polarization separation element 61 and is reflected by the reflection mirror 63 so as to enter the second condenser lens 64. The second condenser lens 64 condenses the light beam BLp toward the diffusing member 32 described later of the wavelength conversion element 60.

  The wavelength conversion element 60 of the present embodiment includes a rotating body 60A that can rotate around the rotation axis O. The rotating body 60A includes a rotating substrate 50A, a phosphor layer 31, and a diffusing member 32. In the present embodiment, the rotating substrate 50A is made of a material that transmits the light beam BLs and the light beam BLp. As a material of the rotation substrate 50A, for example, quartz glass, quartz, sapphire, optical glass, transparent resin or the like can be used.

The only difference between the rotating body 60A of the present embodiment and the rotating body 20A of the above embodiment is that the material constituting the rotating substrate 50A is a light-transmitting material.
The rotary substrate 50 </ b> A of the present embodiment has a recess 51. Therefore, when the lower surface 31b of the phosphor layer 31 is used as a reference for the height, the difference between the height of the upper surface 31a of the phosphor layer 31 and the height of the upper surface 32a of the diffusion member 32 is the thickness of the phosphor layer 31 and the diffusion member It is smaller than the difference with the thickness of 32. Thereby, interference between the first pickup lens 16 and the upper surface 32 a of the diffusion member 32 can be prevented.

  In the present embodiment, the fluorescent light Y emitted from the phosphor layer 31 enters the reflection mirror 67 through the first pickup lens 16. The fluorescent light Y is reflected by the reflection mirror 67 to be incident on the light combining element 69.

  On the other hand, the light beam BLp diffused by the diffusion member 32 enters the light combining element 69 through the second pickup lens 18 as the diffused blue light BLp ′.

  The light combining element 69 is composed of, for example, a dichroic mirror. The light combining element 69 transmits the diffused blue light BLp ′ and reflects the fluorescent light Y to combine the diffused blue light BLp ′ and the fluorescent light Y to generate a white illumination light WL. The illumination light WL is incident on the uniform illumination optical system 23.

Since the illuminating device 2A of the present embodiment includes the wavelength conversion element 60, interference between the first pickup lens 16 and the diffusing member 32 is prevented, and the illuminating device 2 can be easily downsized.
Therefore, the projector 1 to which such an illuminating device 2A is applied has a small size and high reliability in which an operation failure due to interference is prevented.

  In the illumination device 2A of the present embodiment, the configurations according to the modification of the embodiment may be combined as appropriate so as not to contradict each other.

Third Embodiment
Next, a projector according to a third embodiment will be described. The projector according to the first embodiment is exemplified by the method using three liquid crystal panels, but the projector according to the present embodiment is different in that one digital micromirror device is used. In the following description, the same reference numerals are given to the same configurations and members as in the first embodiment, and the detailed description thereof is omitted.

FIG. 12 is a top view showing an optical system of the projector 1A according to the present embodiment.
As shown in FIG. 12, the projector 1A modulates the illumination light L superimposed by the illumination device 2B, the superposition optical system 26 on which the light from the illumination device 2B is incident, and the superposition optical system 26 according to the image signal. The light modulation device 27 and the projection optical system 6 that projects the image light G from the light modulation device 27 toward the screen SCR are provided. In the present embodiment, a digital micro mirror device is used as the light modulation device 27.

The illumination device 2B includes a light source device 29, a wavelength conversion element 70, a motor M, a condenser lens 76, and a pickup lens 77.
The light source device 29 includes an array light source 11, a collimator optical system 12, an afocal optical system 13, and a homogenizer optical system 14, which are components of the illumination device 2A of the second embodiment. The light source device 29 emits a light beam bundle K including a plurality of light beams.

  The condensing lens 76 condenses the light beam K from the light source device 29 toward the wavelength conversion element 70. The pickup lens 77 picks up the light emitted from the wavelength conversion element 70.

  The wavelength conversion element 70 includes a rotating body 70A that can rotate around the rotation axis O.

Fig.13 (a) is a front view of 70 A of rotary bodies, FIG.13 (b) is sectional drawing by F1-F1 arrow of Fig.3 (a).
As shown in FIG. 13A, the rotating body 70A includes a rotating substrate 71, a first phosphor layer 31G, a second phosphor layer 31R, and a diffusion member 32. In the following description, the first phosphor layer 31G and the second phosphor layer 31R may be collectively referred to as the phosphor layer 31. The rotating substrate 71 has a disk shape when viewed from a direction parallel to the rotation axis O.

  Each of the first phosphor layer 31G, the second phosphor layer 31R, and the diffusion member 32 has an arc shape, and is arranged along the circumferential direction of the rotary substrate 71 in this order. A region where the light beam K enters the rotating body 70A is referred to as a light incident region 33A. Since the rotating body 70A rotates around the rotation axis O, the light incident region 33A moves on the rotating body 70A so as to draw an arc around the rotation axis O. Each of the first phosphor layer 31G, the second phosphor layer 31R, and the diffusing member 32 is provided so as to include a part of the region in which the light incident region 33A moves. That is, the first phosphor layer 31G includes a first arc-shaped region corresponding to the locus of the light incident region 33A. Further, the diffusing member 32 includes a second arc-shaped region that is different from the first arc-shaped region corresponding to the locus of the light incident region 33A. In the present embodiment, it is assumed that the first phosphor layer 31G and the second phosphor layer 31R have the same thickness.

  Based on such a configuration, as the rotating body 70A rotates, the light flux K from the light source device 29 is time-sequentially added to the first phosphor layer 31G, the second phosphor layer 31R, and the diffusion member 32. Incident.

  The first phosphor layer 31G converts the light beam K into green fluorescence (green light LG). The second phosphor layer 31R converts the light beam K into red fluorescence (red light LR). The diffusing member 32 emits the light beam K as blue light LB composed of blue diffuse reflected light.

  The light emitted from the rotating body 70 </ b> A is emitted from the illumination device 2 </ b> B as illumination light L through the pickup lens 77. In the present embodiment, the illumination light L includes red light LR, green light LG, and blue light LB. That is, the color of the illumination light L changes in time series with the rotation of the rotating body 70A.

  The superimposing optical system 26 includes two lenses, a superimposing lens 26a and a field lens 26b. The superimposing optical system 26 is arranged so that its optical axis passes through the center of the illumination light L. The superimposing optical system 26 superimposes the illumination light L from the illumination device 2 </ b> B and enters the light modulation device 27.

  By the way, also in this embodiment, the diffusing member 32 is thicker than the phosphor layer 31. The distance between the pickup lens 72 and the phosphor layer 31 is set in accordance with the focal length of the pickup lens 72 with respect to the wavelength of the fluorescent light Y. Therefore, when the rotating body 70A rotates, the lower end of the pickup lens 72 may interfere with the diffusion member 32.

  On the other hand, a recess 75 is provided on the upper surface 71 a of the rotating substrate 71. The phosphor layer 31 is provided in a region 71a1 outside the recess 75 in the upper surface 71a, and the diffusion member 32 is provided in a region 71a2 inside the recess 75 in the upper surface 71a.

  Based on this configuration, when the lower surface 31Gb of the first phosphor layer 31G is used as a reference for the height, the difference between the height of the upper surface 31a of the phosphor layer 31 and the height of the upper surface 32a of the diffusion member 32 is the phosphor layer The height of the lower surface 32b of the diffusing member 32 is set so as to be smaller than the difference between the thickness of 31 and the thickness of the diffusing member 32.

  Thus, the height of the upper surface 31 a of the phosphor layer 31 can be made close to the height of the upper surface 32 a of the diffusion member 32, so that interference between the pickup lens 72 and the upper surface 32 a of the diffusion member 32 can be prevented.

  In addition, this invention is not necessarily limited to the thing of the said embodiment, It is possible to add a various change in the range which does not deviate from the meaning of this invention.

  In the above embodiment, the first optical element is formed of a phosphor layer and the second optical element is formed of a diffusion member. However, both of the first optical element and the second optical element are formed. It may be a phosphor layer. For example, the first optical element may be a phosphor layer that generates red fluorescence, and the second optical element may be a phosphor layer that generates green fluorescence.

  Moreover, although the example which mounted the illuminating device by this invention in the projector was shown in the said embodiment, it is not restricted to this. The lighting device according to the present invention can also be applied to lighting fixtures, automobile headlights, and the like.

  DESCRIPTION OF SYMBOLS 1 ..., 1A ... Projector, 2, 2A, 2B ... Lighting apparatus, 4B, 4G, 4R ... Light modulation apparatus, 6, 28 ... Projection optical system, 11 ... Array light source, 20, 40, 41, 42, 43, 44 , 60, 70 ... wavelength conversion element, 20A, 41A, 42A, 44A, 60A, 70A ... rotating body, 22 ... photosynthesis element, 27 ... light modulation device, 31, 131 ... phosphor layer, 31A ... light incident area 31 arc, circular area 1), 31a, 131a ... upper surface (second surface), 31b, 131b ... lower surface (third surface), 32, 132, 232 ... diffusion member, 32A ... light incident region (second circle) Arc shaped region), 32a, 132a ... top surface (fourth surface), 32b, 132b ... bottom surface (fifth surface) 50, 50A, 52, 71, 150, 151 ... rotating substrate, 52a, 71a, 150a, 151a ... Upper surface (first surface of substrate , 61: first polarization separation element, 69: light combining element, 77: pickup lens, 154: connection member, K: light beam, M: motor (drive device), O: rotation axis, Y: fluorescent light, SP: spacer , WL, L: Illumination light.

Claims (7)

What is claimed is: 1. A wavelength conversion element comprising a rotating body rotatable around an axis of rotation,
The rotating body includes a substrate having a first surface, a first optical element provided on an upper portion of the first surface, and a second optical element,
The first optical element includes at least a first arc-shaped region centered on the rotation axis, a second surface from which light is emitted, and a third surface facing the second surface; Have
The second optical element includes at least a second arc-shaped region centered on the rotation axis, a fourth surface from which light is emitted, and a fifth surface facing the fourth surface; Have
The thickness of the first optical element is smaller than the thickness of the second optical element,
The substrate is provided on the third surface side of the first optical element,
The second surface and the fourth surface face the same side,
When the third surface is used as a height reference, the difference between the height of the second surface and the height of the fourth surface is the thickness of the first optical element and the thickness of the second optical element. rather smaller than the difference,
When viewed from a direction parallel to the rotation axis, the substrate is a wavelength conversion element attached to the inside or the outside of the second optical element. The second optical element has a ring shape;
The substrate, the wavelength conversion element according to claim 1 which is attached to the inner side of the second optical element. The substrate has a ring shape;
The substrate, the wavelength conversion element according to claim 1 which is attached to the outside of the second optical element. The first optical element includes a wavelength conversion layer,
The second optical element includes a diffusing member,
The wavelength conversion element according to claim 3 , wherein the first optical element is provided outside the second optical element when viewed from a direction parallel to the rotation axis. The wavelength conversion element according to any one of claims 1 to 4 , wherein at least one of the substrate and the second optical element includes a fitting portion for connecting the substrate to the second optical element. A light source device for emitting a light bundle;
The wavelength conversion element according to any one of claims 1 to 5 ,
A driving device for rotating the rotating body around the rotation axis;
With the first pickup lens,
A lighting device comprising a second pickup lens,
The radius of the first arcuate region is different from the radius of the second arcuate region,
A part of the light flux is incident on the first optical element,
The other part of the light flux is incident on the second optical element,
The light emitted from the first optical element is incident on the first pickup lens,
A light emitted from the second optical element is incident on the second pickup lens. A lighting device according to claim 6 ,
A light modulation device that forms image light by modulating light from the illumination device according to image information; and
A projection optical system that projects the image light.

Images