projector

Abstract

To accurately adjust a projection image based on a movement amount in a projector.SOLUTION: A projector according to the present invention comprises: a light source device that emits light including first light of a first wavelength and second light of a second wavelength different from the first wavelength; a light separation element that separates the light emitted from the light source device into the first light and the second light; a first optical modulation device that modulates the first light; a second optical modulation device that modulates the second light; a photosynthetic element that synthesizes the light emitted from the first optical modulation device and the light emitted from the second optical modulation device; a projection optical system that projects the light emitted from the photosynthetic element; a light source that emits invisible light; and an optical element that synthesizes the first light emitted from the light separation element and the invisible light. The first light emitted from the optical element and the invisible light enter the first optical modulation device. The projection optical system projects light that includes the first light, the second light, and the invisible light.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a projector. [Background technology]

[0002] In an image display device such as a projector, in order to control a visible image to be displayed, a visible image and an invisible image such as an infrared image may be superimposed on a screen, and control may be performed based on information obtainable from the invisible image. For example, Patent Document 1 discloses a projector that separates infrared light from light emitted from a light source and superimposes it on a projected image via a dedicated light modulation element. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-176195 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the device disclosed in the above-mentioned Patent Document 1, in addition to the light modulation devices for the respective color lights of red light, green light, and blue light, which are visible light, a light modulation device for infrared light, which is invisible light, is arranged. Therefore, it is not possible to directly track the movement or deviation of the projected image caused by factors on the optical path of each color light of visible light. As a result, there is a problem that the amount of movement of the projected image composed of the actual visible light does not match the amount of movement detected, making it difficult to accurately adjust the projected image based on the amount of movement. [Means for solving the problem]

[0005] In order to solve the above problem, a projector according to one aspect of the present invention includes a light source device that emits light including a first light having a first wavelength and a second light having a second wavelength different from the first wavelength, a light separation element that separates the light emitted from the light source device into the first light and the second light, a first light modulation device that modulates the first light, a second light modulation device that modulates the second light, a light synthesis element that synthesizes the light emitted from the first light modulation device and the light emitted from the second light modulation device, a projection optical system that projects the light emitted from the light synthesis element, a light source that emits invisible light, and an optical element that synthesizes the first light and the invisible light emitted from the light separation element. The first light modulation device is incident on the first light modulation device. The projection optical system projects light including the first light, the second light, and the invisible light. [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is a schematic diagram of a projector according to an embodiment of the present invention. [Diagram 2] 2 is a plan view of a diffraction element included in the projector of FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 is a schematic diagram showing the configuration of a projector 15 according to an embodiment. The projector 15 is an image display device equipped with a liquid crystal panel as a light modulation device. In the following drawings, the scale of the dimensions of the components may be changed in order to make each component easier to see.

[0008] (projector) 1, the projector 15 includes an illumination device 20, a light source 150, a color separation optical system 200, field lenses 300R, 300G, and 300B, incident-side polarizing plates 410R, 410G, and 410B, light modulation devices 400R, 400G, and 400B, exit-side polarizing plates 420R, 400G, and 400B, a cross dichroic prism 500, a projection optical system 600, an image sensor 710, a moving mechanism 720, and a control unit 730. The illumination device 20 emits white light WL that is synthesized from red light R, green light G, and blue light B, which are visible light.

[0009] The illumination device 20 includes a light source device 100, a first lens array 70, a second lens array 80, a polarization conversion element 92, and a superimposing lens 94. The light source device 100 emits white light WL. The configuration of the light source device 100 will be described later.

[0010] The white light WL emitted from the light source device 100 is collimated and enters the first lens array 70. The first lens array 70 has a plurality of small lenses 71 for splitting the white light WL emitted from the light source device 100 into a plurality of partial light beams. The plurality of small lenses 71 are arranged in a matrix in a plane perpendicular to the optical axis AX100 of the light source device 100.

[0011] The second lens array 80 has a plurality of small lenses 81 corresponding to the plurality of small lenses 71 of the first lens array 70. The plurality of small lenses 81 are arranged in a matrix in a plane perpendicular to the optical axis AX100. The second lens array 80, together with the superimposing lens 94, forms an image of each of the small lenses 71 of the first lens array 70 near the image forming area of ​​each of the light modulation devices 400R, 400G, and 400B.

[0012] The polarization conversion element 92 has a polarization separation layer, a reflection layer, and a phase difference plate, which are not shown. The polarization conversion element 92 converts the partial light beam emitted from the second lens array 80 into linearly polarized light. The polarization conversion element 92 is formed in a plate shape as a whole. The plate surface of the polarization conversion element 92 is arranged parallel to a plane perpendicular to the optical axis AX100. The polarization separation layer of the polarization conversion element 92 transmits one linearly polarized component of the polarized components contained in the partial light beam emitted from the second lens array 80, and reflects the other linearly polarized component in a direction perpendicular to the optical axis AX100. The reflection layer of the polarization conversion element 92 reflects the other linearly polarized component reflected by the polarization separation layer in a direction parallel to the optical axis AX100. The phase difference plate of the polarization conversion element 92 converts the other linearly polarized component reflected by the reflection layer into one linearly polarized component.

[0013] The superimposing lens 94 collects the partial light beams from the polarization conversion element 92 and superimposes them near the image forming areas of the light modulation devices 400R, 400G, and 400B. The first lens array 70, the second lens array 80, and the superimposing lens 94 constitute an integrator optical system. The integrator optical system makes the in-plane light intensity distribution of the white light WL emitted from the illumination device 20 uniform in the image forming areas of the light modulation devices 400R, 400G, and 400B.

[0014] The color separation optical system 200 includes dichroic mirrors 210, 220, and 450, reflecting mirrors 240 and 250, and relay lenses 260 and 270. The color separation optical system 200 separates the white light WL emitted from the illumination device 20 into red light R, green light G, and blue light B, which are visible light, and guides each of the red light R, green light G, and blue light B to the light modulation devices 400R, 400G, and 400B, respectively. Infrared light I is also introduced into the color separation optical system 200.

[0015] Dichroic mirror 210 passes red light R of incident white light WL and reflects green light G and blue light B. Dichroic mirror 220 reflects green light G of incident green light G and blue light B and passes blue light B. Dichroic mirror 450 reflects substantially all of incident red light R. Each of reflecting mirrors 240, 250 reflects substantially all of incident blue light B.

[0016] The light source 150 emits invisible light, for example, infrared light I. The light source 150 is an infrared light emitting diode (LED) that emits the infrared light I. As shown in the figure, the light source 150 may have a plurality of infrared light emitting diodes arranged in a plane perpendicular to the optical axis of the infrared light I, or may have a single infrared light emitting diode arranged therein. The infrared light I emitted from the light source 150 passes through the dichroic mirror 450 and travels along an optical path that overlaps with the red light R reflected by the dichroic mirror 450 in a planar view in the same direction as the reflected red light R.

[0017] Each of the field lenses 300R, 300G, and 300B is disposed between the color separation optical system 200 and each of the optical modulation devices 400R, 400G, and 400B on the optical paths of the red light R, green light G, and blue light B. The red light R reflected by the dichroic mirror 450 passes through the field lens 300R and enters the image forming area of ​​the optical modulation device 400R. The green light G reflected by the dichroic mirror 220 passes through the field lens 300G and enters the image forming area of ​​the optical modulation device 400G. The blue light B reflected by the reflection mirror 250 passes through the field lens 300B and enters the image forming area of ​​the optical modulation device 400B.

[0018] Each of the optical modulation devices 400R, 400G, and 400B is composed of a liquid crystal panel that forms an image by modulating the incident red light R, green light G, and blue light B in accordance with image information. The operation mode of the liquid crystal panel may be any of TN mode, VA mode, transverse electric field mode, etc., and is not limited to a specific mode.

[0019] The incident side polarizing plate 410R is disposed on the optical path of the red light R between the dichroic mirror 210 and the dichroic mirror 410. The incident side polarizing plates 410G and 410B are disposed on the light incident surface side of the optical modulation devices 400G and 400B, respectively. The exit side polarizing plates 420R, 420G, and 420B are disposed on the light exit surface side of the optical modulation devices 400R, 400G, and 400B, respectively.

[0020] The cross dichroic prism 500 forms a color image by combining the image lights emitted from each of the light modulation devices 400R, 400G, and 400B. As shown in FIG. 1, the cross dichroic prism 500 is formed in a substantially cubic shape as a whole by gathering and arranging four right-angle prisms so that their apexes overlap each other at a common center position in side view. A dielectric multilayer film (not shown) is formed on the interface where the right-angle prisms are bonded to each other in the cross dichroic prism 500. The aforementioned interface is formed in a substantially X-shape in side view.

[0021] The color image emerging from the cross dichroic prism 500 is enlarged and projected by the projection optical system 600 to form an image on the screen SCR.

[0022] The imaging element 710 captures a projection image including infrared light I and red light R projected by the projection optical system 600. The imaging element 710 is, for example, an imaging camera, and may be disposed in a location in the projector 15 that does not block the light emitted from the projection optical system 600, or may be installed in any location.

[0023] The movement mechanism 720 receives an electrical signal from the control unit 730, moves the projection optical system 600, and changes the position of the projected image.

[0024] The control unit 730 controls the moving mechanism 720 in accordance with the image pickup result captured by the image pickup element 710. The control unit 730 controls the image pickup device 710 in response to the image pickup result. Therefore, the image of the light modulation device 400R corresponding to the red light R is formation A region that forms an image in the region The control unit 730 can change the area of ​​the image pickup device 710, the moving mechanism 72, etc. 0, the light source 150, and the optical modulators 400R, 400G, and 400B. It is composed of a computer or integrated circuit that has the drive device processing program built in. That is, the control unit 730 is, for example, a processor. The element 710, the moving mechanism 720, and the optical modulation devices 400R, 400G, and 400B are connected to the above by wire or wirelessly (not shown).

[0025] In the projector 15, it is preferable that the diffraction element 501 is disposed on the light emission side of the light source 150 and diffracts infrared light I, which is an example of invisible light. The infrared light I, which is invisible light, projected by the projection optical system 600 includes a predetermined pattern. The predetermined pattern is determined by the surface pattern of the diffraction element 501.

[0026] The projector 15 may further include a light-transmitting member 505 illustrated in Fig. 2, which is disposed on one of the light incident side and the light exit side of the light modulation device 400R. The light-transmitting member 505 has a shielding portion 511 that reflects invisible light and transmits, for example, red light R as the first light, and a transmitting portion 512 that transmits both infrared light I, which is invisible light, and red light R, which is the first light. The infrared light I, which is invisible light, projected by the projection optical system 600 includes a predetermined pattern. The predetermined pattern is, for example, a dot-shaped pattern.

[0027] The projector 15 of the first embodiment described above includes a light source device 100, a dichroic mirror 210 as a light separation element, a light modulation device 400R as a first light modulation device, light modulation devices 400G and 400B as second light modulation devices, a cross dichroic prism 500 as a light synthesis element, a projection optical system 600, a light source 150, and a dichroic mirror 450 as an optical element. The light source device 100 emits light including a first light of a first wavelength and a second light of a second wavelength different from the first wavelength, that is, white light WL. The red light R corresponds to the first light of the first wavelength. The green light G and the blue light B correspond to the second light of a second wavelength different from the red light R. The dichroic mirror 210 separates the white light WL emitted from the light source device 100 into red light R, and green light G and blue light B. The light modulation device 400R modulates the red light R. The light modulation device 400G modulates the green light G. The light modulation device 400B modulates the blue light B. The cross dichroic prism 500 combines the light emitted from the light modulation device 400R and the light emitted from 400G and 400B. The projection optical system 600 projects the light emitted from the cross dichroic prism 500. The light source 150 emits invisible light, for example, infrared light I. The red light R of the white light WL emitted from the light source device 100 and the infrared light I emitted from the light source 150 are incident on the light modulation device 400R. The projection optical system 600 projects light including the red light R, green light G, blue light B, and infrared light I.

[0028] The projector 15 of the first embodiment includes a light source 150 that emits invisible infrared light I in addition to a light source device 100 for forming a projection image. The light source 150 is, for example, an infrared light source or an infrared light emitting diode that emits infrared light I. In the projector 15 of the first embodiment, the optical path of the infrared light I emitted from the light source 150 is overlapped with one of the optical paths of the colored light in the color separation optical system 200. In the projector 15 of the first embodiment, for example, red light R and infrared light I, whose optical paths are overlapped with each other, pass through a common optical modulation device 400R, and for example, green light G and blue light B other than these colored lights pass through optical modulation devices 400G and 400B, respectively, and the red light R, infrared light I, green light G and blue light B are combined and emitted as projection light. Therefore, in the projector 15 of the first embodiment, it is possible to directly track the movement or deviation of the projection image caused by a factor on the optical path of any of the colored light of each colored light of visible light. According to the projector 15 of the first embodiment, the amount of movement of the projected image formed by actual visible light matches the amount of movement that is detected, and the projected image can be accurately adjusted based on the amount of movement.

[0029] In the projector 15 of the first embodiment, the dichroic mirror 450, which is an optical element, reflects red light R, which is the first light, and transmits invisible infrared light I. The light source 150 is disposed on the opposite side of the dichroic mirror 450 to the light modulation device 400R, which is the first light modulation device.

[0030] In projector 15 of the first embodiment, the optical path of infrared light I emitted from light source 150 is overlapped with the optical path of red light R as one of the optical paths of colored light in color separation optical system 200. According to projector 15 of the first embodiment, it is possible to directly track movement or deviation of the projected image caused by factors on the optical path of red light R, which is the first light.

[0031] The projector 15 of the first embodiment further includes an incident side polarizing plate 410R as a first polarizing element and an exit side polarizing plate 420R as a second polarizing element. The incident side polarizing plate 410R is disposed between the dichroic mirror 210 as a light separation element and the light modulation device 400R as a first light modulation device, specifically, between the dichroic mirror 210 and the dichroic mirror 450. The red light R emitted from the dichroic mirror 210 is incident on the incident side polarizing plate 410R. The exit side polarizing plate 420R is disposed between the light modulation device 400R and the cross dichroic prism 500 as a light combining element. The red light, which is the first light, and the infrared light I, which is invisible light, which are emitted from the light modulation device 400R, are incident on the exit side polarizing plate 420R. The infrared light I is unpolarized. The incident-side polarizing plate 410R emits red S-polarized light, which is the first light in a first polarization direction. The light modulation device 400R emits light including at least one of unpolarized infrared light I, red S-polarized light, and red P-polarized light, which is the first light in a second polarization direction different from the first polarization direction. The exit-side polarizing plate 420R emits infrared P-polarized light, which is invisible light in a second polarization direction, and red P-polarized light. According to the projector 15 of the first embodiment, the polarization of the red light R and the infrared light I, which are examples of the first light, is clearly switched, and the loss of the red light R and the infrared light I is suppressed, and the projected image can be made clear.

[0032] In the projector 15 of the first embodiment, the first light is red light R, and the invisible light is infrared light I. A dichroic mirror 450 as an optical element combines the red light R and the infrared light I and emits the combined light. The red light R has a wavelength that is closest to the infrared light I among the three primary colors of light for forming a projected image. According to the projector 15 of the first embodiment, the polarization states of the red light R and the infrared light I can be effectively utilized.

[0033] In the projector 15 of the first embodiment, the first light is blue light B, and the invisible light is ultraviolet light. The optical element combines the blue light B and the ultraviolet light and emits the combined light. The blue light B has a wavelength that is closest to ultraviolet light among the three primary colors of light for forming a projected image. According to the projector 15 of the first embodiment, the polarization states of the blue light B and the ultraviolet light can be effectively utilized.

[0034] The projector 15 of the first embodiment may further include a diffraction element 501 that is disposed on the light emission side of the light source 150 and diffracts infrared light I, which is an example of invisible light. The infrared light I, which is invisible light, projected by the projection optical system 600 includes a predetermined pattern.

[0035] The projector 15 of the first embodiment may further include a light-transmitting member 505 arranged on one of the light incident side and the light exit side of the light modulation device 400R. The light-transmitting member 505 has a shielding portion 511 that reflects invisible light and transmits, for example, red light R as the first light, and a transmitting portion 512 that transmits both infrared light I, which is invisible light, and red light R, which is the first light. The infrared light I, which is invisible light, projected by the projection optical system 600 includes a predetermined pattern.

[0036] According to the projector 15 of the first embodiment, a predetermined pattern of invisible light, i.e., infrared light I, is projected onto a projection surface such as a screen SCR, and by detecting position information, etc. of the predetermined pattern, the amount of movement of a projected image composed of actual visible light can be detected with high accuracy.

[0037] The projector 15 of the first embodiment further includes an image sensor 710, a movement mechanism 720, and a control unit 730. The image sensor 710 captures a projection image including infrared light I, which is invisible light, and red light R, which is a first light, projected by the projection optical system 600. The movement mechanism 720 moves the projection optical system 600 to change the position of the projection image. The control unit 730 controls the movement mechanism 720 according to the imaging result captured by the image sensor 710. According to the projector 15 of the first embodiment, the control unit 730 can be used to move the projection optical system 600 to an optimal position with high accuracy.

[0038] The projector 15 of the first embodiment further includes an image sensor 710 and a control unit 730. The imaging element 710 captures invisible infrared light projected by the projection optical system 600. The control unit 730 captures a projection image including the first light I and red light R, which is an example of the first light. The image of the light modulation device 400R is obtained according to the image pickup result captured by the image pickup device 710. formation In the area This changes the area where the image is formed.

[0039] Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims. Also, the components of multiple embodiments can be appropriately combined.

[0040] For example, the first light may be blue light B, and the invisible light may be ultraviolet light. In this case, the optical element combines the blue light B and the ultraviolet light and emits the combined light.

[0041] [Summary of this disclosure] The following is a summary of this disclosure. (Supplementary Note 1) A projector comprising: a light source device that emits light including a first light of a first wavelength and a second light of a second wavelength different from the first wavelength; a light separation element that separates the light emitted from the light source device into the first light and the second light; a first light modulation device that modulates the first light; a second light modulation device that modulates the second light; a light combining element that combines the light emitted from the first light modulation device and the light emitted from the second light modulation device; a projection optical system that projects the light emitted from the light combining element; a light source that emits invisible light; and an optical element that combines the first light and the invisible light emitted from the light separation element, wherein the first light and the invisible light emitted from the optical element are incident on the first light modulation device, and the projection optical system projects light including the first light, the second light, and the invisible light.

[0042] With the configuration of Supplementary Note 1, the amount of movement of the projected image formed from actual visible light coincides with the amount of movement that is detected, and the projected image can be accurately adjusted based on the amount of movement.

[0043] (Supplementary Note 2) The projector of Supplementary Note 1, wherein the optical element reflects the first light and transmits the invisible light, and the light source is disposed on the opposite side of the optical element from the first light modulation device.

[0044] The configuration of Supplementary Note 2 makes it possible to directly track the movement or deviation of the projected image caused by factors on the optical path of the first light.

[0045] (Supplementary Note 3) The projector of Supplementary Note 1 or Supplementary Note 2, further comprising: a first polarizing element arranged between the light separation element and the first light modulation device, onto which the first light emitted from the light separation element is incident; and a second polarizing element arranged between the first light modulation device and the light combining element, onto which the first light emitted from the first light modulation device and the invisible light are incident, wherein the invisible light is unpolarized, the first polarizing element emits the first light in a first polarization direction, the first light modulation device emits the invisible light, which is unpolarized, and light including at least one of the first light in the first polarization direction and the first light in a second polarization direction different from the first polarization direction, and the second polarizing element emits the invisible light in the second polarization direction and the first light in the second polarization direction.

[0046] The configuration of Supplementary Note 3 makes it possible to suppress loss of the first light and the invisible light and to make the projected image clearer.

[0047] (Supplementary Note 4) The projector of Supplementary Note 3, wherein the first light is red light, the invisible light is infrared light, and the optical element combines the red light and the infrared light and emits the combined light.

[0048] The configuration of Supplementary Note 4 allows the polarization state of infrared light and red light, which has a wavelength closer to that of infrared light than to other colors of visible light, to be effectively utilized.

[0049] (Supplementary Note 5) The projector of Supplementary Note 3, wherein the first light is blue light, the invisible light is ultraviolet light, and the optical element combines the blue light and the ultraviolet light and emits the combined light.

[0050] The configuration of Supplementary Note 5 allows the polarization state of ultraviolet light and blue light, which has a wavelength closer to that of ultraviolet light than to other colors of visible light, to be effectively utilized.

[0051] (Supplementary Note 6) Any of the projectors according to Supplementary Note 1 to Supplementary Note 5, further comprising a diffraction element arranged on the light emission side of the light source and diffracting the invisible light, wherein the invisible light projected by the projection optical system includes a predetermined pattern.

[0052] With the configuration of Supplementary Note 6, a predetermined pattern of invisible light is projected, and by detecting position information, etc. of the predetermined pattern, the amount of movement of a projected image composed of actual visible light can be detected with high accuracy.

[0053] (Supplementary Note 7) Any of the projectors according to Supplementary Note 1 to Supplementary Note 5, further comprising a light-transmitting member arranged on one of the light incident side and the light exit side of the first light modulation device, the light-transmitting member having a shielding portion that reflects the invisible light and transmits the first light, and a transmitting portion that transmits both the invisible light and the first light, and the invisible light projected by the projection optical system includes a predetermined pattern.

[0054] With the configuration of Supplementary Note 7, a predetermined pattern of invisible light is projected, and by detecting position information, etc. of the predetermined pattern, the amount of movement of a projected image composed of actual visible light can be detected with high accuracy.

[0055] (Appendix 8) Any of the projectors according to appendix 1 to appendix 7, further comprising an imaging element that captures a projection image including the invisible light and the first light projected by the projection optical system, a movement mechanism that moves the projection optical system and changes a position of the projection image, and a control unit that controls the movement mechanism in accordance with the imaging result captured by the imaging element.

[0056] According to the configuration of Supplementary Note 8, the projection optical system can be moved to an optimal position with high precision using the control unit.

[0057] (Supplementary Note 9) A projection image including the invisible light and the first light projected by the projection optical system. An imaging element for capturing an image; The image of the first light modulation device is formation region a control unit for changing an area in which an image is formed; 8. The projector of any one of claims 1 to 7, further comprising:

[0058] According to the configuration of Supplementary Note 9, an image of the first light modulation device is controlled by using a control unit. formation Image correlation in the region The paired position can be moved to the optimum position with high accuracy. [Explanation of symbols]

[0059] 15...projector, 100...light source device, 150...light source.

Claims

1. A light source that emits light including a first light having a first wavelength and a second light having a second wavelength different from the first wavelength. A power source device. a light separation element that separates the light emitted from the light source device into the first light and the second light; 、 a first light modulation device that modulates the first light; a second light modulation device that modulates the second light; The light emitted from the first light modulation device and the light emitted from the second light modulation device are combined. A photosynthetic element that a projection optical system that projects the light emitted from the light combining element; A light source that emits invisible light; an optical element that combines the first light and the invisible light emitted from the light separation element; A light beam emitted from the light splitting element is disposed between the light splitting element and the first light modulation device. a first polarizing element into which the first light is incident; A light source is disposed between the first light modulation device and the light combining element, and the light emitted from the first light modulation device is a second polarizing element into which the first light and the invisible light are incident; Equipped with The first light modulation device receives the first light and the invisible light emitted from the optical element. Entering, the projection optical system projects light including the first light, the second light, and the invisible light, the invisible light is unpolarized; The first polarizing element emits the first light having a first polarization direction, The first light modulation device is configured to receive the invisible light, which is unpolarized, and the first light having the first polarization direction. and at least one of the first light having a second polarization direction different from the first polarization direction. It emits light and The second polarizing element polarizes the invisible light in the second polarization direction and the A projector that emits a single light.

2. The projector according to claim 1 , the optical element reflects the first light and transmits the invisible light, the light source is disposed on the opposite side of the optical element from the first light modulation device. projector.

3. The projector according to claim 1 , the first light is red light, the invisible light is infrared light, The optical element combines the red light and the infrared light and emits the combined light.

4. The projector according to claim 1 , the first light is blue light, the invisible light is ultraviolet light, The optical element combines the blue light and the ultraviolet light and emits the combined light.

5. 3. The projector according to claim 1, Further, a diffraction element is provided on the light output side of the light source and diffracts the invisible light. The invisible light projected by the projection optical system includes a predetermined pattern. Kutor.

6. 3. The projector according to claim 1, a light-transmitting member disposed on one of the light incident side and the light exit side of the first light modulation device; In preparation for The light-transmitting member includes a shielding portion that reflects the invisible light and transmits the first light, and a light-transmitting portion that transmits the invisible light. a transmission portion that transmits both the light and the first light, The invisible light projected by the projection optical system includes a predetermined pattern. Kutor.

7. 3. The projector according to claim 1, A projection image including the invisible light and the first light projected by the projection optical system is captured. an imaging element for imaging an image; a moving mechanism that moves the projection optical system to change the position of the projected image; a control unit that controls the moving mechanism in response to an image captured by the image sensor; A projector further equipped with:

8. 3. The projector according to claim 1, A projection image including the invisible light and the first light projected by the projection optical system is captured. An image sensor for detecting an image The image forming area of ​​the first light modulation device is a control unit for changing an area in which an image is formed; A projector further equipped with:

Images