JP2010072539A - Optical device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical device and a projector achieving light weight and a low cost by improving the flatness of a reflective member having flexibility. <P>SOLUTION: The optical device is equipped with: a plurality of reflective type light modulating devices modulating a plurality of color beams by color in accordance with image information; a plurality of flexible wire grids 441 polarizing and separating luminous fluxes with which the reflective type light modulating devices are irradiated and luminous fluxes modulated by the reflective type light modulating devices; a cross-dichroic prism 443 synthesizing a modulated beam by colors modulated by the plurality of reflective type light modulating devices to form an image beam; a holding member 5 holding the wire grids 441; and an adjusting member 7 disposed between the holding face 521 of the holding member 5 holding the wire grids 441 and the wire grids 441 and adjusting the flatness of the wire grids 441. Therefore the flatness of the wire grids 441 can be improved by inserting the adjusting member 7 between the wire grids 441 and the holding face 521. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical device and a projector.

Conventionally, a light source device, a plurality of light modulation devices provided for each of three color lights of red (R), green (G), and blue (B), and a color composition for combining each color light modulated by each light modulation device A so-called reflective three-plate projector including a cross dichroic prism as an optical device is known (see, for example, Patent Document 1).
As an optical device of the projector, a light beam irradiated to the light modulation device, a reflection member (PBS: Polarized Beam Splitter) for polarizing and separating the light beam modulated by the light modulation device, and a holding member for holding the reflection member are provided. There is something. It is conceivable to use a film-like flexible material for the reflecting member in order to reduce the weight of the projector.

JP 2004-29251 A

  However, in the projector described in Patent Document 1, when the reflecting member and the holding member are fixed with an adhesive, the flexible reflecting member is likely to warp against the holding member due to the adhesive force. Further, when the reflecting member and the holding member are fixed by a fixing member such as a spring, the flexible reflecting member is likely to be warped due to distortion on the surface (holding surface) with which the holding member contacts. As described above, when the reflecting member is warped, the flatness of the reflecting member is lowered. Therefore, the reflecting member cannot appropriately reflect the light beam separated by polarization, and there is a problem that the projected image is distorted. Therefore, in order to suppress the distortion of the projected image, it may be possible to prevent the distortion by fixing the reflecting member to the rigid glass. However, this rigid glass is heavy and expensive. There is.

  An object of the present invention is to provide an optical device and a projector that can improve the flatness of a flexible reflecting member and can reduce the weight and cost.

  The optical device of the present invention polarization-separates a plurality of light modulation devices that modulate a plurality of color lights according to image information for each color light, a light beam applied to the light modulation device, and a light beam modulated by the light modulation device A plurality of flexible reflecting members, a color synthesizing optical device that synthesizes modulated light for each color light modulated by the plurality of light modulation devices, a holding member that holds the reflecting member, and the holding An adjustment member is provided between the holding surface of the member for holding the reflection member and the reflection member, and adjusts the flatness of the reflection member.

  According to the present invention, the adjusting member is interposed between the flexible reflecting member and the holding member that holds the reflecting member. Accordingly, when the flexible reflecting member is distorted by the distortion of the holding surface, an adjustment member for adjusting the flatness of the reflecting member is interposed between the reflecting member and the holding surface, It is possible to correct the distortion and improve the flatness of the reflecting member. For example, the adjusting member is interposed at a position where the reflecting member is distorted, and the reflecting member is separated from the holding member and fixed to the adjusting member with an adhesive or the like. I can suppress it. Then, the adjustment member can correct the distortion of the reflecting member and improve the flatness of the reflecting member. Since the adjusting member is interposed between the reflecting member and the holding surface, for example, there is no need to fix the reflecting member having flexibility to rigid glass, and the optical device is reduced in weight and cost. can do.

In this invention, it is preferable to provide the fixing member which fixes the said reflection member to the said holding member.
According to the present invention, since the reflecting member is fixed to the holding member using the fixing member, for example, the reflecting member can be fixed more firmly than the reflecting member is fixed to the holding member with an adhesive or the like, and the reflecting member can be held. Deviation from the surface can be prevented.

In the present invention, it is preferable that the adjustment member has a tip portion formed in a wedge shape.
According to the present invention, since the tip of the adjustment member is formed in a wedge shape, for example, when the reflection member is distorted, the wedge-shaped adjustment member can be easily inserted between the reflection member and the holding surface. A space can be formed between the holding surface and the distortion of the reflecting member can be corrected.

In this invention, it is preferable that the said adjustment member is provided with the shaft member pivotally supported with respect to the said holding surface.
According to the present invention, for example, when a wedge-shaped adjustment member is previously interposed between the reflection member and the holding surface and the adjustment member is rotated, the reflection member and the holding surface are separated by the wedge-shaped tip of the adjustment member. The gap between the two can be enlarged. That is, the reflecting member can correct the distortion of the reflecting member while suppressing the influence of the distortion on the surface of the holding surface.

In the present invention, the holding member has a plurality of protrusions extending in a direction intersecting the holding surface, the reflection member abuts on the protrusion, and the reflection member, the holding surface, It is preferable that the adjusting member is interposed in a space formed between the two.
According to the present invention, since the plurality of protrusions extend in a direction intersecting the holding surface, the reflecting member comes into contact with the protrusion and is fixed to the holding member. At this time, since a space is formed between the reflecting member and the holding surface, the adjusting member can be easily interposed in this space, and the distortion of the reflecting member can be easily corrected.

In the present invention, a light source device, a color separation optical device that separates light emitted from the light source device into a plurality of color lights, the optical device according to any one of claims 1 to 3, and the optical device. And a projection optical device for projecting the synthesized light flux.
According to the present invention, since the projector includes the optical device described above, the projector can enjoy the same operations and effects as the optical device described above. Further, according to the above-described optical device, it is not necessary to fix the reflecting member to the rigid glass, and the projector can be reduced in weight and cost.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment according to the invention will be described with reference to the drawings.
[First Embodiment]
[Projector structure]
FIG. 1 is a diagram illustrating a structure of a projector 1 according to the present embodiment.
The projector 1 modulates a light beam emitted from a light source according to image information to form a color image, and enlarges and projects the formed color image on a screen (not shown). As shown in FIG. 1, the projector 1 includes an exterior housing 2, a projection lens 3, and an optical unit 4.
The exterior housing 2 includes a projection lens 3 and an optical unit 4 as a projection optical device.

The projection lens 3 is configured as a combined lens in which a plurality of lenses are combined, and enlarges and projects the color image formed by the optical unit 4 on the screen.

The optical unit 4 is a unit that forms a color image by modulating a light beam emitted from a light source according to image information under the control of the control device. As shown in FIG. 1, the optical unit 4 includes a light source device 41, an illumination optical device 42, a color separation optical device 43, an optical device 44, and the like.
The light source device 41 includes a light source lamp 411, a reflector 412, and a UV-IR filter 413. The luminous flux emitted from the light source lamp 411 has its emission direction aligned by the reflector 412 and is emitted toward the illumination optical device 42 via the UV-IR filter 413. The UV-IR filter 413 absorbs or reflects light beams in the ultraviolet region and the infrared region and transmits other light beams.

  The illumination optical device 42 includes a first lens array 421, a second lens array 422, a polarization conversion element 423, and a superimposing lens 424. The light beam emitted from the light source device 41 is divided into a plurality of partial light beams by the first lens array 421 and forms an image in the vicinity of the second lens array 422. Each partial light beam emitted from the second lens array 422 is incident so that its central axis (principal ray) is perpendicular to the incident surface of the polarization conversion element 423, and the polarization conversion element 423 emits approximately one type of linearly polarized light. Injected as light. A plurality of partial light beams emitted from the polarization conversion element 423 as linearly polarized light and passed through the superimposing lens 424 are superimposed on three reflective light modulation devices 442 described later of the optical device 44.

In the color separation optical device 43, a B light reflecting dichroic mirror 431A that reflects blue light (B light) and a GR light reflecting dichroic mirror 431B that reflects green light (G light) and red light (R light) are in an X shape. A cross dichroic mirror 431, a G light reflecting dichroic mirror 432 that reflects green light, and two reflecting mirrors 433 and 434 are provided. The color separation optical device 43 separates the plurality of partial light beams emitted from the illumination optical device 42 into red (R), green (G), and blue (B) color lights.
Specifically, the plurality of partial light beams emitted from the illumination optical device 42 enter the cross dichroic mirror 431, the blue light component is reflected by the B light reflecting dichroic mirror 431A, and the green light component and the red light component are separated. The light is reflected by the GR light reflecting dichroic mirror 431B and separated into a blue light component, a green light component, and a red light component.

The blue light separated by the cross dichroic mirror 431 is reflected by the reflection mirror 433 and enters a later-described wire grid 441B constituting the optical device 44.
Further, the green light and red light separated by the cross dichroic mirror 431 are reflected by the reflection mirror 434 and then enter the G light reflection dichroic mirror 432. Of the green light and red light incident on the G light reflecting dichroic mirror 432, the green light is reflected by the G light reflecting dichroic mirror 432 and enters a later-described wire grid 441 </ b> G constituting the optical device 44. On the other hand, the red light is transmitted through the G light reflecting dichroic mirror 432 and is incident on a wire grid 441 </ b> R (described later) constituting the optical device 44.

  The optical device 44 modulates an incident light beam according to image information to form a color image. The optical device 44 includes three wire grids 441 as reflective members, three reflective light modulators 442, a cross dichroic prism 443 as a color synthesizing optical device, and three polarizing plates 444 as optical elements (each color 440R, 444G, and 444B).

  The three wire grids 441 (red light side wire grid 441R, green light side wire grid 441G, blue light side wire grid 441B) have flexibility and are diffracted by the diffraction based on the lattice structure. The incident light beam is polarized and separated. Each wire grid 441 is arranged in a state inclined approximately 45 ° with respect to the optical axis of the incident light beam. Each wire grid 441 transmits polarized light having a polarization direction substantially the same as the polarization direction aligned by the polarization conversion element 423 out of the incident light flux, and polarized light having a polarization direction orthogonal to the polarization direction. The incident light beam is polarized and separated. Each wire grid 441 is fixed to each holding member 5 (FIG. 2) by a fixing member 6 (FIG. 3). The holding member 5 (FIG. 2) holds the wire grid 441, and details will be described later.

  Each of the reflection type light modulation devices 442 (similar to the wire grid 441, the reflection type light modulation devices on the respective color light sides are referred to as 442R, 442G, and 442B), respectively, with respect to the optical axis of the light beam transmitted through each wire grid 441. Arranged in an orthogonal state. The reflective light modulation device 442 modulates the polarization direction of the polarized light beam that has passed through the wire grid 441 and reflects it toward the wire grid 441. Of the light beam reflected toward the wire grid, only the polarized light having the polarization direction orthogonal to the polarization direction aligned by the polarization conversion element 423 is reflected by the wire grid 441.

  Each polarizing plate 444 is disposed to face a light incident surface 4431 (to be described later) of the cross dichroic prism 443 and transmits linearly polarized light having the same polarization direction as that reflected by each wire grid 441. . That is, by using both the wire grid 441 and the polarizing plate 444, the polarizing component 444 removes the polarizing component even when the wire grid 441 reflects a polarization component other than the desired linearly polarized light. The structure to be adopted is adopted.

  The cross dichroic prism 443 (hereinafter may be abbreviated as “prism 443”) has a light beam incident surface 4431 on which each color light reflected by each wire grid 441 is incident (end surfaces on each color light side are 4431R, 4431G, 4431B) and a light beam exit surface 4432 for combining the incident color lights to form a color image and emitting a light beam. The prism 443 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and two dielectric multilayer films are formed at the interface where the right-angle prisms are bonded together. These dielectric multilayer films transmit green light reflected by the wire grid 441G and reflect red and blue light reflected by the wire grids 441R and 441B, respectively. In this way, the color lights are combined to form a color image. The color image formed by the prism 443 is emitted from the light beam exit surface 4432 and enlarged and projected onto the screen by the projection lens 3 described above.

[Structure of holding member]
FIG. 2 is a perspective view showing the wire grid 441 and the holding member 5, and FIG. 3 is a view showing a state in which the wire grid 441 is held by the holding member 5 via the adjustment member 7. More specifically, FIG. 3A is a front view showing the state, and FIG. 3B is a side view showing the state.
The holding member 5 is provided between the wire grid 441 and the light modulation device 442 and holds the wire grid 441 and the light modulation device 442. As shown in FIG. 2, the holding member 5 includes a holding member main body 51 and a frame portion 52. Although not specifically shown, the holding member 5 supports the wire grid 441, the reflection type light modulation device 442, and the polarizing plate 444 inside the outer casing 2, and each member 441, 442, 444 is a cross dichroic prism. It fixes to the light beam entrance surface 4431 corresponding to 443.

The holding member main body 51 is a hollow member having a cavity 51A through which a light beam passes.
The frame portion 52 is a portion where the opening side end surface of the holding member main body 51 is widened outward. The frame portion 52 includes a holding surface 521 and a ridge portion 522.
The holding surface 521 is a surface that is formed on the end surface of the frame portion 52 and holds the wire grid 441. In addition, at least one of the attachment positions of the adjustment member 7 on the holding surface 521 shown in FIG. 3 (the four corners of the holding surface 521 and the substantially central portion of each side of the holding surface 521) indicates the distortion state of the wire grid 441. It is selected in consideration. The adjustment member 7 is attached to the selected attachment position (arbitrary position). In addition, this attachment position is not limited to 8 places shown in FIG. 3, According to distortion of the wire grid 441, you may attach the adjustment member 7 to another position suitably.
As shown in FIG. 2, the protruding portion 522 is formed along the outer periphery of the frame portion 52, and protrudes outward from the outer peripheral surface of the holding member main body 51. A fixing member 6 to be described later comes into contact with the protruding portion 522.

[Structure of fixing member]
The fixing member 6 has a clip shape, and is attached to the upper and lower sides of the holding member 5 as shown in FIG. The fixing member 6 is formed in a substantially U shape in a side view including a pair of gripping portions 61 and 62 facing each other and a connection portion 63 that connects between one ends of the gripping portions 61 and 62. One holding part 61 abuts on the protruding part 522 and the other holding part 62 presses the surface of the wire grid 441, whereby the fixing member 6 holds the protruding part 522 and the wire grid 441 together. To do. Here, in order to prevent the distortion of the wire grid 441 that occurs during clamping, the adjustment member 7 is interposed at an arbitrary position between the holding surface 521 and the wire grid 441.

[Adjustment member structure]
FIG. 4 is a perspective view showing the adjustment member 7 according to the present embodiment, and FIG. 4A shows the adjustment member 7 used in the present embodiment.
As shown in FIG. 4A, the adjustment member 7 is formed into a rectangular plate by sheet metal processing. The thickness of the adjustment member is determined to a desired thickness according to the strain state of the wire grid 441. The adjustment member 7 is interposed between the wire grid 441 and the holding surface 521, whereby the distortion of the wire grid 441 is corrected. In this embodiment, the adjusting member 7 is formed in a rectangular plate shape, but as shown in FIGS. 4B, 4C, and 4D, it is formed in an L-shaped plate shape, a triangular plate shape, or a wedge shape. It may be formed. For example, if the adjustment member 7 shown in FIGS. 4B and 4C is used as the adjustment member interposed at the four corners of the holding surface 521, the four corners of the holding surface 521 and the four corners of the wire grid 441 are shifted. It is held without.

  According to these configurations, the fixing member 6 is distorted in the flexible wire grid 441 in a state where the protrusion 522 and the wire grid 441 are sandwiched together, and image light is appropriately synthesized. If not, the adjusting member 7 having an appropriate thickness is interposed at an arbitrary position between the wire grid 441 and the holding surface 521.

The first embodiment described above has the following effects.
The adjustment member 7 is interposed at an arbitrary position between the wire grid 441 and the holding surface 521. That is, the flatness of the wire grid 441 can be improved by interposing the adjusting member 7 at a place where the wire grid 441 is distorted and separating the wire grid 441 from the holding surface 521, so that the wire grid 441 is held on the holding surface. The influence of the distortion of 521 can be suppressed. That is, it is not necessary to hold the wire grid 441 on rigid glass, and the occurrence of distortion of the projected image can be suppressed by using the flexible wire grid 441, and the optical device and the projector can be reduced in weight and cost. Can be achieved.

[Second Embodiment]
FIG. 5 is an exploded perspective view showing a state in which the wire grid 441 is held by the holding member 5 according to the second embodiment of the present invention. In the description of the drawings, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the second embodiment, a plurality of protrusions 523 are formed on the inner peripheral portion of the frame portion 52 in the first embodiment so as to extend in a direction intersecting the holding surface 521.
More specifically, the protrusion 523 is formed in a rectangular plate shape, and extends from the upper and lower portions of the cavity 51A by the same length as the thickness of the adjustment member 7 in a direction intersecting the holding surface 521. The protrusion 523 is in contact with the wire grid 441. A space S is formed between the wire grid 441 and the holding surface 521. The adjustment member 7 is interposed in the space S. In addition, about the material of the adjustment member 7, you may have the elasticity which can be inserted in the space S.

  According to the second embodiment described above, the protrusions 523 are provided on the upper and lower portions of the cavity 51A, and the wire grid 441 contacts the protrusions 523 to form the space S. Therefore, the adjustment member 7 having a thickness corresponding to the distortion state of the wire grid 441 can be easily inserted into the space S, and the distortion of the wire grid 441 can be corrected by the adjustment member 7.

[Third Embodiment]
FIG. 6 is a view showing the adjustment member 7 according to the third embodiment of the present invention, and FIG. 7 is a side view showing a state in which the wire grid 441 in the present embodiment is held by the holding member 5. In FIG. 7, the adjustment member 7 of FIG. 6A among FIGS. 6A to 6C is employed. In the description of the drawings, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the first embodiment, after the wire grid 441 is held on the holding surface 521, the adjustment member 7 is interposed between the wire grid 441 and the holding surface 521 in accordance with the distortion state of the wire grid 441. . However, in the third embodiment, as shown in FIG. 7, the adjustment member 7 having the tip portion 71 formed in a wedge shape in cross section is interposed between the holding surface 521 and the wire grid 441 in advance.
The adjustment member 7 formed in a wedge shape is pivotally supported on the holding surface 521 via a pin 8 as a shaft member described later. Then, as shown in FIG. 6, the fixing member 6 fixes the wire grid 441 to the holding member 5 by sandwiching the wire grid 441 and the protruding portion 522.

  As shown in FIG. 6A, the adjustment member 7 in the present embodiment is formed in a substantially disc shape when viewed from the front, and an insertion hole 72 is formed in a substantially central portion. A pin 8 that rotates the adjustment member 7 is inserted into the insertion hole 72. In addition, as the adjustment member 7 of the present embodiment, the adjustment member 7 having a substantially circular shape in front view shown in FIG. 6A is adopted, but not limited thereto, as shown in FIGS. 6B and 6C. The shape may be different from that shown in FIG. Specifically, in FIG. 6B, the adjustment member 7 is formed in a substantially rectangular plate shape in front view, and in FIG. 6C, it is formed in a substantially triangular plate shape in front view.

  According to the third embodiment described above, the adjustment member 7 configured to be rotatable between the wire grid 441 and the holding surface 521 is interposed in advance. The strip 522 is held between the fixing members 6. When the pin 8 is rotated with a tool or the like (not shown) according to the distortion state of the wire grid 441, the adjustment member 7 is rotated about the pin 8. As a result, as shown by a two-dot chain line in FIG. 7, the tip 71 of the adjustment member 7 widens the interval between the wire grid 441 and the holding surface 521 in accordance with the distortion state of the wire grid 441, and the wire grid 441. Can be suppressed from being affected by the distortion of the holding surface 521, and the adjustment member 7 can correct the distortion of the wire grid 441.

[Modification of Embodiment]
The best configuration, method, and the like for carrying out the present invention have been disclosed above, but the present invention is not limited to this. That is, the present invention has been illustrated and described with particular reference to particular embodiments, but it is not intended to depart from the technical idea and scope of the invention, Various modifications can be made by those skilled in the art in terms of quantity and other detailed configurations.
Therefore, the description limited to the shape, quantity and the like disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

For example, in each of the above embodiments, a three-plate projector including three reflective light modulators 442 is used. However, the present invention is not limited to this, and a projector including two reflective light modulators 442, a reflective light modulator, or the like. You may comprise as a projector provided with four or more apparatuses 442. FIG. At this time, the projector includes the same number of wire grids 441 as the reflection type light modulation device 442.
In each of the embodiments described above, the fixing member 6 is simply a clip-shaped member, but is not limited to this, and a clip using a spring or the like may be employed.

Moreover, in each said embodiment, although the wire grid 441 was being fixed to the holding member 5 with the fixing member 6, it is not limited to this, You may fix using an adhesive agent.
In each of the above embodiments, the fixing member 6 is fixed so as to hold the upper side and the lower side of the wire grid 441. However, depending on the distortion state of the wire grid 441, the fixing member 6 may be fixed by holding the right side and the left side. Good.

In the second embodiment, the protrusions 523 are formed on the upper and lower portions of the cavity 51A. However, the present invention is not limited to this, and may be formed on the right and left portions of the cavity 51A. You may select freely according to the distortion state of 441.
In the second embodiment, the protruding portion 523 extends in the direction intersecting the holding surface 521 by substantially the same length as the thickness of the adjusting member 7, but the extending length is not limited to this. Specifically, the adjustment member 7 may extend thinner than the thickness of the adjustment member 7. In this case, the distortion of the wire grid 441 can be corrected by interposing an elastic adjustment member.

  In each of the above-described embodiments, the reflection type light modulation device 442 is employed. However, the present invention is not limited to this, and a transmission type light modulation device, a digital micromirror device (DMD), or the like may be employed. DMD is a trademark of Texas Instruments Incorporated.

  Since the present invention can appropriately combine image light, it can be used in an optical device.

FIG. 2 is a diagram schematically showing a configuration of a projector according to the invention. The perspective view of the wire grid and holding member which concern on 1st Embodiment of this invention. The figure which shows the state by which the wire grid which concerns on the said 1st Embodiment is attached to the holding member. The perspective view which shows the adjustment member which concerns on the said 1st Embodiment. The disassembled perspective view which shows the state by which the wire grid which concerns on 2nd Embodiment of this invention is attached to the holding member. The figure which shows the adjustment member which concerns on 3rd Embodiment of this invention. The side view which shows the state by which the wire grid which concerns on the said 3rd Embodiment is attached to the holding member.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 3 ... Projection lens (projection optical apparatus), 5 ... Holding member, 6 ... Fixing member, 7 ... Adjustment member, 8 ... Pin (shaft member), 41 ... Light source device, 43 ... Color separation optical apparatus, 44 DESCRIPTION OF SYMBOLS ... Optical apparatus, 71 ... Tip part, 441 ... Wire grid (reflective member), 442 ... Reflective light modulator (light modulator), 443 ... Cross dichroic prism (color synthesis optical apparatus), 521 ... Holding surface, 523 ... Projection, S ... space.

Claims (6)

A plurality of light modulation devices that modulate a plurality of color lights according to image information for each color light; and
A plurality of flexible reflecting members for polarizing and separating the light beam applied to the light modulation device and the light beam modulated by the light modulation device;
A color synthesizing optical device that synthesizes modulated light for each of the color lights modulated by the plurality of light modulation devices;
A holding member for holding the reflecting member;
An optical apparatus comprising: an adjustment member that is interposed between a holding surface that holds the reflecting member of the holding member and the reflecting member, and that adjusts the flatness of the reflecting member. The optical device according to claim 1.
An optical device comprising: a fixing member that fixes the reflecting member to the holding member. The optical device according to claim 1 or 2,
The adjustment device has a tip portion formed in a wedge shape. The optical device according to claim 3.
The optical device, wherein the adjustment member includes a shaft member that is pivotally supported with respect to the holding surface. The optical device according to any one of claims 1 to 3,
The holding member has a plurality of protrusions extending in a direction intersecting the holding surface,
The reflection member abuts on the protrusion,
The optical device, wherein the adjustment member is interposed in a space formed between the reflection member and the holding surface. A light source device;
A color separation optical device for separating light emitted from the light source device into a plurality of color lights;
An optical device according to any one of claims 1 to 3,
A projector comprising: a projection optical device that projects a light beam synthesized by the optical device.

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