Projector

Abstract

To provide a projector having an imaging function and capable of using various kinds of common optical systems.SOLUTION: A projector comprises: a light source; a light modulation element that forms a projection image by modulated light obtained by modulating emission light emitted from the light source; a first relay optical system that forms the intermediate image of the projection image at a first position; an enlargement optical system that includes an enlargement side and a reduction side and projects an enlarged image obtained by enlarging the intermediate image of the projection image located on the reduction side to the enlargement side; an attachment / detachment mechanism that enables the enlargement optical system to be attached to and detached from the first relay optical system; and an imaging element that receives a formed image formed by imaging light incident from the enlargement side of the enlargement optical system and emitted from the reduction side. The reduction side of the enlargement optical system is telecentric.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a projector.

Background Art

[0002] A projector having an imaging function is described in Patent Document 1. The projector in this document includes a display unit, an imaging element, a projection optical system into which light is incident from the display unit, a common optical system that projects the light that has passed through the projection optical system, and an optical member that guides the light from the display unit to the common optical system and guides the intermediate image formed by the common optical system to the imaging element.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a projector having an imaging function, it is desired to use various types of common optical systems according to the projection specifications. However, Patent Document 1 does not describe a configuration using various types of common optical systems.

Means for Solving the Problems

[0005] In order to solve the above problems, the projector of the present invention includes a light source, a light modulation element that forms a projection image with modulated light obtained by modulating the emitted light emitted from the light source, a first relay optical system that forms an intermediate image of the projection image at a first position, an enlargement optical system that includes an enlargement side and a reduction side and projects an enlarged image obtained by enlarging the intermediate image of the projection image located on the reduction side onto the enlargement side, a detaching mechanism that enables the enlargement optical system to be detachably attached to the first relay optical system, and an imaging element that receives an imaging image formed by imaging light that enters from the enlargement side of the enlargement optical system and exits from the reduction side. The reduction side of the enlargement optical system is telecentric.

Brief Description of Drawings

[0006]

Figure 1

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Figure 19

Figure 20

[0007] Hereinafter, a projector according to an embodiment of the present invention will be described with reference to the drawings.

[0008] [Embodiment 1] (Projector) FIG. 1 is a schematic diagram of the main part of the projector 1. FIG. 2 is a schematic diagram of the main part of the light source device 2. The projector 1 projects an enlarged image onto the screen S and images a range including the enlarged image projected onto the screen S. As shown in FIG. 1, the projector 1 includes a light source device 2, a plurality of light modulation elements 3 that modulate the light emitted from the light source device 2 to form a projection image, an optical system 4 that projects the projection image formed by the light modulation elements 3 onto the screen S, an imaging element 8 that receives the imaging light incident from the enlarged side of the optical system 4, and a control unit 10 that controls the light modulation elements 3 and the imaging element 8. The optical system 4 includes a first relay optical system 5, a second relay optical system 6, an enlarging optical system 7, and a light deflection element 9. The first relay optical system 5 includes a dichroic prism 50.

[0009] As shown in FIG. 2, the light source device 2 includes an illumination optical system 20 and a separation optical system 30. The illumination optical system 20 includes a light source 21, a first integrator lens 22, a second integrator lens 23, a polarization conversion element 24, and a superimposing lens 25. The light source 21 is composed of, for example, an ultra-high pressure mercury lamp, a solid light source, or the like. The first integrator lens 22 divides the light beam from the light source 21 into a plurality and condenses the light beam near the second integrator lens 23. The polarization conversion element 24 converts the light from the second integrator lens 23 into a predetermined linearly polarized light. The superimposing lens 25 emits the light beam emitted from the polarization conversion element 24 toward the separation optical system 30.

[0010] The separation optical system 30 includes a first dichroic mirror 31, a reflection mirror 32, and a field lens 33R. The first dichroic mirror 31 reflects the R light, which is a part of the light beam incident from the superimposing lens 25, and transmits the G light and the B light, which are parts of the light beam incident from the superimposing lens 25. The R light reflected by the first dichroic mirror 31 enters the light modulation element 3R through the reflection mirror 32 and the field lens 33R.

[0011] The separation optical system 30 includes a second dichroic mirror 34 and a field lens 33G. The second dichroic mirror 34 reflects the G light, which is part of the light beam from the first dichroic mirror 31, and transmits the B light, which is part of the light beam from the first dichroic mirror 31. The G light reflected by the second dichroic mirror 34 enters the optical modulation element 3G through the field lens 33G.

[0012] The separation optical system 30 includes relay lenses 35, a reflection mirror 36, relay lenses 37, a reflection mirror 38, and a field lens 33B. The B light transmitted through the second dichroic mirror 34 enters the optical modulation element 3B through the relay lenses 35, the reflection mirror 36, the relay lenses 37, the reflection mirror 38, and the field lens 33B.

[0013] As shown in FIG. 1, the optical modulation element 3 operates under the control of the control unit 10 based on an external image signal such as a video signal. Three optical modulation elements 3 are provided. In this embodiment, the optical modulation element 3 is a liquid crystal panel. The optical modulation element 3 forms a red projection image by modulating R light according to the image signal. The optical modulation element 3G forms a green projection image by modulating G light according to the image signal. The optical modulation element 3B forms a blue projection image by modulating B light according to the image signal. Here, the polarization components of the modulated light emitted from each optical modulation element 3 are aligned by polarizing plates arranged before and after each optical modulation element 3. In this embodiment, the modulated light emitted from each optical modulation element 3 is a light beam with an S polarization component.

[0014] The dichroic prism 50 generates a projection image by combining the light beams modulated by the optical modulation elements 3R, 3G, and 3B. As shown in FIG. 1, the first relay optical system 5 forms an intermediate image 15 of the projection image formed by the optical modulation element 3 at the first position S1. The magnification optical system 7 projects an enlarged image obtained by enlarging the intermediate image 15 located on the reduction side onto the screen S on the enlargement side.

[0015] The magnifying optical system 7 is a projection lens 70 in which a plurality of lenses are held in a lens barrel. Here, the projector 1 includes a detaching mechanism 11 for detachably holding the projection lens 70. As the detaching mechanism 11, various mechanisms capable of detachably holding the projection lens 70, such as a screw method, a spigot method, and a bayonet method, can be adopted. Thereby, the projector 1 can replace the projection lens 70 according to the projection specifications. That is, the detaching mechanism 11 makes the magnifying optical system 7 detachable with respect to the first relay optical system 5.

[0016] The imaging device 8 receives an imaging image in which the imaging light incident from the magnifying side of the magnifying optical system 7 and exiting from the reducing side is imaged. The imaging device 8 is composed of a CCD sensor, a CMOS sensor, or the like. The second relay optical system 6 forms an intermediate image 16 of the imaging image formed by the imaging device 8 at the first position S1. Here, the projection image formed by the light modulation element 3 and the imaging image formed by the imaging device 8 are rectangular images of the same size.

[0017] The light deflection element 9 guides the imaging light from the magnifying optical system 7 to the imaging device 8 and guides the modulated light from the light modulation element 3 to the magnifying optical system 7. In this embodiment, the light deflection element 9 is disposed on the reducing side of the magnifying optical system 7, guides the imaging light from the magnifying optical system 7 to the second relay optical system 6, and guides the modulated light from the first relay optical system 5 to the magnifying optical system 7. Here, the first position S1 is located between the light deflection element 9 and the magnifying optical system 7.

[0018] (Details of the optical system) FIG. 3 is a diagram showing a schematic configuration of the optical system of Embodiment 1. FIG. 4 is a schematic configuration diagram of a projection optical system for projecting modulated light in the optical system of Embodiment 1. FIG. 5 is a schematic configuration diagram of an imaging optical system for imaging imaging light in the optical system of Embodiment 1. FIG. 6 is a diagram for explaining the positional relationship between the light modulation element and the intermediate image of the projection image in the first relay optical system.

[0019] As shown in FIG. 3, the optical system 4 includes a projection optical system 41 for projecting the modulated light LA shown in FIG. 4 and an imaging optical system 42 for imaging the imaging light LB shown in FIG. 5.

[0020] As shown in FIGS. 3 to 5, the magnifying optical system 7 includes 14 lenses L1 to L14 and a prism 71. The lenses L1 to L14 are arranged in this order from the magnifying side toward the reducing side. The prism 71 is arranged on the reducing side of the lens L14. An aperture 75 is arranged between the lens L8 and the lens L9. The lenses L4 and L5 are a joined lens L21 joined together. The lenses L7 and L8 are a joined lens L22 joined together. The lenses L11 and L12 are a joined lens L23 joined together. The lens L1 has an aspherical shape on both surfaces. The lens L10 has an aspherical shape on both surfaces.

[0021] As shown in FIGS. 3 and 4, the first relay optical system 5 forms an intermediate image 15 having the same magnification as the projection image 18 formed on the light modulation element 3 at the first position S1. The first relay optical system 5 has, in the order in which the modulated light passes from the light modulation element 3 toward the first position S1, a dichroic prism 50, a first lens element 51a, a first reflecting member 52, and a second lens element 51b. The dichroic prism 50 is located between the light modulation element 3 and the first lens element 51a. The first lens element 51a and the second lens element 51b are composed of an integral lens member 51 having positive power. Here, in the following description, for convenience, three axes orthogonal to each other are defined as the X-axis, the Y-axis, and the Z-axis. Also, the direction in which the lenses L1 to L14 are arranged is defined as the X-axis direction. In the X-axis direction, the side where the lens L1 is located is defined as X1, and the side where the lens L14 is located is defined as X2. The vertical direction is defined as the Z-axis direction. In the Z-axis direction, the lower side is defined as Z1, and the upper side is defined as Z2.

[0022] The lens member 51 has convex surfaces on both sides. The lens member 51 has aspherical shapes on both sides. The optical axis P1 of the lens member 51 extends in the X-axis direction. The lens member 51 has a rotationally symmetric shape about the optical axis P1. The first lens element 51a is located on the Y1 side with respect to the optical axis P1 of the lens member 51, and the second lens element 51b is located on the Y2 side. Therefore, the first lens element 51a and the second lens element 51b each have positive power and are lenses having the same biconvex shape and the same refractive index as each other. That is, the first lens element 51a and the second lens element 51b are symmetrically provided with respect to a symmetry plane including the optical axis P1. In this embodiment, the first lens element 51a constitutes the first lens group, and the second lens element 51b constitutes the second lens group.

[0023] The first reflecting member 52 includes a first transmission surface 52a and a first reflecting surface 52b. The first transmission surface 52a is located on the X1 side, and the first reflecting surface 52b is located on the X2 side. The first transmission surface 52a has a concave shape that is recessed on the Y2 side. The first transmission surface 52a has an aspherical shape.

[0024] The first reflecting surface 52b has a concave shape that is recessed on the X2 side. The first reflecting surface 52b has an aspherical shape. The first reflecting surface 52b is formed by providing a reflective coating layer on the outer surface on the X2 side of the first reflecting member 52. The optical axis P2 of the first reflecting member 52 extends in the X-axis direction. The first transmission surface 52a and the first reflecting surface 52b have a rotationally symmetric shape about the optical axis P2. That is, the first transmission surface 52a and the first reflecting surface 52b are plane-symmetric with respect to a symmetry plane including the optical axis P2. The optical axis P2 of the first reflecting member 52 coincides with the optical axis P1 of the lens member 51.

[0025] The first relay optical system 5 includes a first light control member 54 that is adjacent to the first transmission surface 52a on the incident side of the first transmission surface 52a and that limits the amount of light incident on the first reflecting member 52. The first light control member 54 can employ a diaphragm that mechanically controls the amount of light, such as a shutter, or a diaphragm that electrically controls the amount of light, such as a liquid crystal device.

[0026] As shown in FIG. 6, the projection image 18 and the intermediate image 15 are each rectangular image planes having a first side 56 facing in the Y-axis direction (first direction) and a second side 57 facing in the Z-axis direction (second direction). Here, the projection image 18 is a projection image formed by the optical modulation element 3G. The center line 56a parallel to the first side 56 of the projection image 18 does not overlap with the center line 56b parallel to the first side 56 of the intermediate image 15. The center line 57a parallel to the second side 57 of the projection image 18 does not overlap with the center line 57b parallel to the second side 57 of the intermediate image 15. That is, the projection image 18 and the intermediate image 15 are arranged at positions shifted from each other in the Y-axis direction and the Z-axis direction. Thereby, the dichroic prism 50 and the light deflection element 9 are arranged at positions shifted from each other in the Y-axis direction and the Z axis direction.

[0027] As shown in FIGS. 3 and 5, the second relay optical system 6 forms an intermediate image 16 having the same magnification as the imaging image 19 formed by the imaging element 8 at the first position S1. The second relay optical system 6 has the same optical characteristics as the first relay optical system 5. Therefore, the projection image 18, the intermediate image 15, the intermediate image 16, and the imaging image 19 are the same size.

[0028] The second relay optical system 6 includes a first lens element 61a, a second reflecting member 62, a second lens element 61b, and a prism 65 in the order in which imaging light passes from the first position S1 toward the imaging element 8. The first lens element 61a and the second lens element 61b are formed of an integral lens member 61 having positive power. The prism 65 is disposed between the second lens element 61b and the imaging element 8. In this embodiment, the lens member 61 has the same configuration as the lens member 51. The second reflecting member 62 has the same configuration as the first reflecting member 52. Therefore, detailed descriptions of the lens member 61 and the second reflecting member 62 are omitted.

[0029] The prism 65 has the same optical characteristics as the dichroic prism 50. The prism 65 makes the optical distance between the imaging element 8 and the exit surface of the second lens element 61b equal to the optical distance between the entrance surface of the first lens element 61a and the first position S1. That is, the optical distance between the imaging element 8 and the exit surface of the second lens element 61b is equal to the optical distance between the light modulation element 3 and the entrance surface of the first lens element 51a. The optical distance between the entrance surface of the first lens element 61a and the first position S1 is equal to the optical distance between the exit surface of the second lens element 51b and the first position S1.

[0030] Since the second relay optical system 6 has the same optical characteristics as the first relay optical system 5, the imaging image 19 and the intermediate image 16 are arranged at positions shifted from each other in the Z-axis direction and the Z-axis direction. Thereby, the prism 65 and the light deflection element 9 disposed between the imaging element 8 and the lens member 61 are arranged at positions shifted from each other in the X-axis direction and the Z-axis direction.

[0031] The second relay optical system 6 includes a second light control member 64 that is adjacent to the second transmission surface 62a on the incident side of the second transmission surface 62a and limits the amount of light incident on the second reflection member 62. The second light control member 64 can employ a diaphragm that mechanically controls the light amount like a light shielding plate or a diaphragm that electrically controls the light amount like a liquid crystal device. In this embodiment, the first light control member 54 and the second light control member 64 are configured such that the F-number of the second relay optical system 6 is larger than the F-number of the first relay optical system 5.

[0032] As shown in FIGS. 3 to 5, an enlarging optical system 7 is disposed in the X1 direction of the light deflection element 9, a first lens element 61a is disposed in the X2 direction, and a second lens element 51b is disposed in the Y2 direction. The light deflection element 9 includes a polarization separation film 91. The polarization separation film 91 transmits one of the P-polarized component and the S-polarized component of the polarization components included in the light beam and reflects the other polarization component. In this embodiment, the polarization separation film 91 transmits the S-polarized component of the polarization components included in the light beam and reflects the P-polarized component. As a result, as shown in FIG. 4, the modulated light LA of the S-polarized component emitted from the first relay optical system 5 passes through the polarization separation film 91 and enters the enlarging optical system 7. Further, as shown in FIG. 5, the imaging light LB of the P-polarized component among the imaging light emitted from the enlarging optical system 7 is reflected by the polarization separation film 91 and enters the second relay optical system 6.

[0033] As shown in FIG. 4, the modulated light LA of the S-polarized component emitted from the light modulation element 3 passes through the dichroic prism 50 and the first lens element 51a and reaches the first reflecting member 52. The modulated light LA emitted from the first lens element 51a passes through the first transmission surface 52a and is reflected by the first reflecting surface 52b. The modulated light LA reflected by the first reflecting surface 52b passes through the first transmission surface 52a and reaches the second lens element 51b. The modulated light LA emitted from the first reflecting member 52 passes through the second lens element 51b and reaches the light deflection element 9. The modulated light LA emitted from the second lens element 51b passes through the polarization separation film 91 and forms an intermediate image 15 as an intermediate image at the first position S1. The modulated light LA that has passed through the first position S1 enters the enlarging optical system 7. As a result, the intermediate image 15 is projected as an enlarged image onto the screen S by the enlarging optical system 7.

[0034] As shown in Fig. 5, the imaging light LB that enters from the magnifying side of the magnifying optical system 7 and exits from the reducing side reaches the light deflection element 9. At this time, the imaging light LB that enters from the magnifying side of the magnifying optical system 7 and exits from the reducing side forms an intermediate image 16 at the first position S1. Among the imaging light emitted from the magnifying optical system 7, the imaging light LB of the P-polarization component is reflected by the polarization separation film 91 and reaches the first lens element 61a. The imaging light LB of the P-polarization component emitted from the light deflection element 9 passes through the first lens element 61a and reaches the second reflecting member 62. The imaging light LB emitted from the first lens element 61a passes through the second transmission surface 62a and is reflected by the second reflecting surface 62b. The imaging light LB reflected by the second reflecting surface 62b passes through the second transmission surface 62a and reaches the second lens element 61b. The imaging light LB emitted from the second reflecting member 62 passes through the second lens element 61b and reaches the prism 65. The imaging light LB emitted from the second lens element 61b passes through the prism 65 and forms an imaging image 19 on the imaging element 8. The imaging element 8 receives the imaging image 19 formed by the imaging light LB of the P-polarization component.

[0035] As shown in Figs. 3 to 5, the reducing-side imaging surface of the magnifying optical system 7 is located at the first position S1. The reducing side of the magnifying optical system 7 is telecentric. Telecentric means that the chief ray of each light ray passing through the imaging surface is parallel or substantially parallel to the optical axis at the imaging surface. Since the reducing side of the magnifying optical system 7 is telecentric, the chief ray of each light ray passing through the reducing-side imaging surface is parallel or substantially parallel to the optical axis N of the reducing-side imaging surface. In this specification, telecentric means that the angle formed by the chief ray of each light beam and the optical axis of the imaging surface is within ±5°.

[0036] As shown in Fig. 4, both sides of the first relay optical system 5 are telecentric. Therefore, the chief ray of each light ray passing through the imaging surface at the first position S1 is parallel or substantially parallel to the optical axis N1 of the imaging surface at the first position S1. The chief ray of each light ray passing through the imaging surface in the light modulation element 3 is parallel or substantially parallel to the optical axis N2 of the imaging surface in the light modulation element 3.

[0037] As shown in FIG. 5, both sides of the second relay optical system 6 are telecentric. Therefore, the chief ray of each ray passing through the imaging plane at the first position S1 is parallel or substantially parallel to the optical axis N1 of the imaging plane at the first position S1. The chief ray of each ray passing through the imaging plane in the imaging device 8 is parallel or substantially parallel to the optical axis N3 of the imaging plane in the imaging device 8. Here, in this embodiment, the second relay optical system 6 corresponds to the first optical system of the present invention.

[0038] (Lens data) The lens data of the projection optical system 41 shown in FIG. 4 is as follows. The surface numbers are assigned in order from the magnifying side to the reducing side. The symbols are the symbols of the screen, lens, prism, light deflection element, lens, dichroic prism, and light modulation element. The data of the surface numbers that do not correspond to the screen, lens, prism, light deflection element, lens, dichroic prism, and light modulation element are dummy data. The surfaces marked with * are aspherical surfaces. R is the radius of curvature. D is the axial surface interval. Nd is the refractive index of the d-line. νd is the Abbe number of the d-line. Y is the effective radius. The units of R, D, and Y are mm.

[0039] Symbol Surface number R D nd vd Mode Y S 0 0.00000 2360.000000 Refraction L1 *1 -30.93600 3.800000 1.50942 55.88 Refraction 21.614 *2 -35.90900 0.400000 Refraction 20.077 L2 3 81.70000 2.000000 1.49700 81.54 Refraction 18.151 4 22.98300 12.400000 Refraction 15.645 L3 5 -31.21800 1.200000 1.49700 81.54 Refraction 15.195 6 118.38200 13.384000 Refraction 15.591 L4 7 176.01300 10.150000 1.83400 37.16 Refraction 17.813 L5 8 -29.89400 1.300000 1.84666 23.78 Flexure 17.954 9 -103.47100 0.200000 Flexure 18.233 L6 10 83.27600 4.320000 1.84666 23.78 Flexure 18.000 11 -298.53100 33.534000 Flexure 17.773 L7 12 63.55500 5.580000 1.77250 49.60 Flexure 11.388 L8 13 -43.02500 1.100000 1.72825 28.46 Flexure 10.847 14 1804.82100 2.873000 Flexure 10.388 L9,75 15 -38.34400 1.000000 1.76182 26.52 Flexure 10.000 16 75.19100 5.832000 Flexure 9.748 L10 *17 -217.03500 4.360000 1.74320 49.29 Flexure 9.824 *18 -29.41800 1.830000 Flexure 10.000 L11 19 -32.01900 1.200000 1.69895 30.13 Flexure 10.250 L12 20 34.78000 7.550000 1.49700 81.54 Flexure 11.274 21 -41.76900 0.200000 Flexure 12.439 L13 22 87.93800 4.850000 1.80809 22.76 Flexure 13.405 23 -86.87400 0.500000 Flexure 13.654 L14 24 170.53700 5.170000 1.59522 67.74 Flexure 13.732 25 -55.33000 5.119637 Flexure 13.712 71 26 0.00000 32.000000 1.51680 64.17 Inflection 12.563 27 0.00000 4.200000 Inflection 9.383 28 0.00000 3.000000 Inflection 8.832 9 29 0.00000 12.500000 1.51680 64.17 Inflection 11.500 91 30 0.00000 12.500000 1.51680 64.17 Inflection 11.500 31 0.00000 8.820000 Inflection 11.500 51b *32 75.20938 25.000000 1.50940 56.47 Inflection 39.405 *33 -86.40080 62.953784 Inflection 39.516 52a *34 -107.98920 9.557316 1.50940 56.47 Inflection 26.500 52b *35 -135.20655 -9.557316 1.50940 56.47 Reflection 26.000 52a *36 -107.98920 -62.953784 Inflection 26.500 51a *37 -86.40080 -25.000000 1.50940 56.47 Inflection 36.145 *38 75.20938 -2.441341 Inflection 42.200 50 39 0.00000 -30.000000 1.71736 29.50 Inflection 19.799 40 0.00000 -8.305100 Inflection 19.799 3 41 0.00000 0.000000 Inflection 8.833

[0040] The aspherical coefficients are as follows.

[0041] Surface number 1 2 17 18 Conic constant -7.43E+00 -8.549E+00 -2.00E+00 5.52E-01 Coefficient of the fourth order 2.575429E-05 2.508628E-05 -1.189732E-05 -1.887723E-06 Coefficient of the sixth order -3.724959E-08 -3.314652E-08 -5.17632E-09 -6.584551E-09 Coefficient of the eighth order 3.59918E-11 1.242655E-11 -4.937693E-10 -2.484272E-10 Coefficient of the tenth order 9.857151E-15 6.209172E-14 2.55588E-12 -7.155889E-13 Coefficient of the twelfth order -3.080937E-17 -4.717475E-17 -3.480507E-15 1.826607E-14 Coefficient of the fourteenth order 1.074993E-20 -2.316431E-20 -8.166188E-17 -1.164168E-16

[0042] Face number 32 33 34 35 Conic constant 0 0 1.59961E+00 0 Coefficient of the fourth order -1.019789E-06 4.015744E-07 0 -8.511161E-09 Coefficient of the sixth order 1.443295E-10 -2.351044E-11 0 -3.574313E-12 Coefficient of the eighth order -7.137023E-15 3.063089E-14 0 7.006635E-15 Coefficient of the tenth order -3.472316E-18 -4.551714E-18 0 -3.002244E-18

[0043] Face number 36 37 38 Conic constant 1.59961E+00 0 0 Coefficient of the fourth order 0 4.015744E-07 -1.019789E-06 Coefficient of the sixth order 0 -2.351044E-11 1.443295E-10 Coefficients of the 8th order: 0, 3.063089E-14, -7.137023E-15 Coefficients of the 10th order: 0, -4.551714E-18, -3.472316E-18

[0044] The lens data of the imaging optical system 42 shown in FIG. 5 is as follows. The surface numbers are assigned in order from the magnifying side to the reducing side. The signs are those of the screen, lens, prism, optical deflection element, lens, prism, and imaging element. The data of the surface numbers that do not correspond to the screen, lens, prism, optical deflection element, lens, dichroic prism, and optical modulation element are dummy data. The surfaces marked with an asterisk (*) in the surface number are aspherical surfaces. R is the radius of curvature. D is the axial surface interval. Nd is the refractive index of the d-line. νd is the Abbe number of the d-line. Y is the effective radius. The units of R, D, and Y are mm.

[0045] Sign, Surface number, R, D, nd, vd, Mode, Y S, 0, 0.00000, 2360.000000, Refraction L1, *1, -30.93600, 3.800000, 1.50942, 55.88, Refraction, 21.614 *2, -35.90900, 0.400000, Refraction, 20.077 L2, 3, 81.70000, 2.000000, 1.49700, 81.54, Refraction, 18.151 4, 22.98300, 12.400000, Refraction, 15.645 L3, 5, -31.21800, 1.200000, 1.49700, 81.54, Refraction, 15.195 6, 118.38200, 13.384000, Refraction, 15.591 L4, 7, 176.01300, 10.150000, 1.83400, 37.16, Refraction, 17.813 L5, 8, -29.89400, 1.300000, 1.84666, 23.78, Refraction, 17.954 9, -103.47100, 0.200000, Refraction, 18.233 L6 10 83.27600 4.320000 1.84666 23.78 Flexure 18.000 11 -298.53100 33.534000 Flexure 17.773 L7 12 63.55500 5.580000 1.77250 49.60 Flexure 11.388 L8 13 -43.02500 1.100000 1.72825 28.46 Flexure 10.847 14 1804.82100 2.873000 Flexure 10.388 L9,75 15 -38.34400 1.000000 1.76182 26.52 Flexure 10.000 16 75.19100 5.832000 Flexure 9.748 L10 *17 -217.03500 4.360000 1.74320 49.29 Flexure 9.824 *18 -29.41800 1.830000 Flexure 10.000 L11 19 -32.01900 1.200000 1.69895 30.13 Flexure 10.250 L12 20 34.78000 7.550000 1.49700 81.54 Flexure 11.274 21 -41.76900 0.200000 Flexure 12.439 L13 22 87.93800 4.850000 1.80809 22.76 Flexure 13.405 23 -86.87400 0.500000 Flexure 13.654 L14 24 170.53700 5.170000 1.59522 67.74 Flexure 13.732 25 -55.33000 5.119637 Flexure 13.712 71 26 0.00000 32.000000 1.51680 64.17 Flexure 12.563 27 0.00000 4.200000 Flexure 9.383 28 0.00000 3.000000 Flexure 8.832 9 29 0.00000 12.500000 1.51680 64.17 Refraction 11.500 91 30 0.00000 -12.500000 1.51680 64.17 Reflection 16.500 31 0.00000 -8.820000 Refraction 11.500 61a *32 -75.20938 -25.000000 1.50940 56.47 Refraction 39.832 *33 86.40080 -62.953784 Refraction 39.965 62a *34 107.98920 -9.557316 1.50940 56.47 Refraction 26.500 62b *35 135.20655 9.557316 1.50940 56.47 Reflection 26.000 62a *36 107.98920 62.953784 Refraction 26.500 61b *37 86.40080 25.000000 1.50940 56.47 Refraction 36.145 *38 -75.20938 2.441341 Refraction 42.200 65 39 0.00000 30.000000 1.71736 29.50 Refraction 19.799 40 0.00000 8.305100 Refraction 19.799 8 41 0.00000 0.000000 Refraction 8.833

[0046] The aspherical coefficients are as follows.

[0047] Surface number 1 2 17 18 Conic constant -7.43E+00 -8.549E+00 -2.00E+00 5.52E-01 4th order coefficient 2.575429E-05 2.508628E-05 -1.189732E-05 -1.887723E-06 Coefficients of 6th degree -3.724959E-08 -3.314652E-08 -5.17632E-09 -6.584551E-09 Coefficients of 8th degree 3.59918E-11 1.242655E-11 -4.937693E-10 -2.484272E-10 Coefficients of 10th degree 9.857151E-15 6.209172E-14 2.55588E-12 -7.155889E-13 Coefficients of 12th degree -3.080937E-17 -4.717475E-17 -3.480507E-15 1.826607E-14 Coefficients of 14th degree 1.074993E-20 -2.316431E-20 -8.166188E-17 -1.164168E-16

[0048] Face numbers 32 33 34 35 Conic constants 0 0 1.59961E+00 0 Coefficients of 4th degree 1.019789E-06 -4.015744E-07 0 8.511161E-09 Coefficients of 6th degree -1.443295E-10 2.351044E-11 0 3.574313E-12 Coefficients of 8th degree 7.137023E-15 -3.063089E-14 0 -7.006635E-15 Coefficients of 10th degree 3.472316E-18 4.551714E-18 0 3.002244E-18

[0049] Face numbers 36 37 38 Conic constants 1.59961E+00 0 0 Coefficients of 4th degree 0 -4.015744E-07 1.019789E-06 Coefficients of 6th degree 0 2.351044E-11 -1.443295E-10 Coefficients of 8th degree 0 -3.063089E-14 7.137023E-15 Coefficients of 10th degree 0 4.551714E-18 3.472316E-18

[0050] FIG. 7 is a diagram showing the MTF on the reduction side of the projection optical system 41. FIG. 8 is a diagram showing the MTF on the reduction side of the imaging optical system 42. The horizontal axes in FIGS. 7 and 8 are spatial frequencies, and the vertical axes are contrast reproduction ratios. As shown in FIG. 7, the projection optical system 41 has high resolution. As shown in FIG. 8, the imaging optical system 42 has high resolution.

[0051] (Function and Effect) The projector 1 of this embodiment includes a light source 21, a light modulation element 3 that forms a projection image 18 with modulated light LA obtained by modulating the emitted light emitted from the light source 21, a first relay optical system 5 that forms an intermediate image 15 of the projection image 18 at a first position S1, an enlargement optical system 7 that has an enlargement side and a reduction side and projects an enlarged image obtained by enlarging the intermediate image 15 of the projection image 18 located on the reduction side to the enlargement side, a detaching mechanism 11 that makes the enlargement optical system 7 detachable with respect to the first relay optical system 5, and an imaging element 8 that receives an imaging image 19 formed by the imaging light LB that has entered from the enlargement side of the enlargement optical system 7 and has exited from the reduction side. The reduction side of the enlargement optical system 7 is telecentric.

[0052] According to this embodiment, the enlargement optical system 7 is replaceable with respect to the first relay optical system 5. Thereby, the projector 1 can replace the enlargement optical system 7 according to the projection specifications. Further, since the reduction side of the enlargement optical system 7 is telecentric, even when the reduction side imaging surface of the enlargement optical system 7 is displaced in the optical axis direction from the first position S1 when the enlargement optical system 7 is attached to the first relay optical system 5, the enlargement optical system 7 can project the intermediate image 15 of the projection image 18 well to the enlargement side.

[0053] Both sides of the first relay optical system 5 are telecentric. The side of the imaging element 8 of the second relay optical system 6 that forms the imaging light LB on the imaging element 8 is telecentric. Thereby, even when the light modulation element 3 is displaced in the optical axis direction, the intermediate image 15 of the projection image 18 without magnification change can be formed at the first position S1. Further, even when the imaging element 8 is displaced in the optical axis direction, the imaging image 19 without magnification change can be formed on the imaging element 8.

[0054] The first relay optical system 5 forms an intermediate image 15 that is the same size as the projected image 18 formed on the light modulation element 3 at the first position S1. The projected image 18 and the imaging image 19 are the same size. Therefore, the projected image 18, the intermediate image 15 of the projected image 18, and the imaging image 19 are the same size. As a result, it is possible to favorably suppress aberrations generated in the common optical system portion of the projection optical system 41 for projecting the projected image 18 and the imaging optical system 42 for forming the imaging image 19 in the optical system 4.

[0055] The projector 1 includes a light deflection element 9 that guides the imaging light LB from the magnifying optical system 7 to the imaging element 8 and guides the modulated light LA from the light modulation element 3 to the magnifying optical system 7, and a second relay optical system 6 that forms an intermediate image 16 of the imaging image 19 at the first position S1. The imaging light LB passes through the magnifying optical system 7, the first position S1, the light deflection element 9, the second relay optical system 6, and the imaging element 8 in this order. As a result, since the first relay optical system 5 as the projection optical system and the second relay optical system 6 as the imaging optical system are separate, optical characteristics corresponding to each optical system can be achieved. Further, since the light deflection element 9 is located at a position close to the first position S1 where the intermediate image is formed, the spread of the light beam passing through the light deflection element 9 is small. Thereby, the size of the light deflection element 9 can be made compact.

[0056] The first relay optical system 5 includes a first reflecting surface 52b having a concave shape. Thereby, by folding the optical path of the first relay optical system 5, the entire first relay optical system 5 can be made compact. Further, since the optical path of the first relay optical system 5 is folded by the first reflecting surface 52b, chromatic aberration generated by folding the optical path can be suppressed.

[0057] The first relay optical system 5 includes a first reflecting member 52 having a first transmitting surface 52a having a negative power and a first reflecting surface 52b having a positive power. Thereby, it becomes easy to control the spread of the light reflected by the first reflecting surface 52b. Further, compared with the case where the first transmitting surface 52a and the first reflecting surface 52b are separate optical members, the component cost can be suppressed.

[0058] The first relay optical system 5 includes a first dimming member 54 that is adjacent to the first transmission surface 52a on the incident side of the first transmission surface 52a and restricts the amount of light incident on the first reflection member 52. Therefore, the light rays emitted from the light modulation element 3 can be evenly restricted. As a result, the contrast of the intermediate image 15 formed at the first position S1 can be improved. As a result, the contrast of the enlarged image projected on the screen S can be improved.

[0059] The first relay optical system 5 includes a first lens element 51a, a first reflection member 52, and a second lens element 51b in the order in which the modulated light LA passes from the light modulation element 3 toward the first position S1. The first lens element 51a has a positive power. The second lens element 51b has a positive power. The modulated light LA emitted from the light modulation element 3 passes through the first lens element 51a and reaches the first reflection member 52. The modulated light LA emitted from the first lens element 51a passes through the first transmission surface 52a and is reflected by the first reflection surface 52b. The modulated light LA reflected by the first reflection surface 52b passes through the first transmission surface 52a and reaches the second lens element 51b. The modulated light LA emitted from the first reflection member 52 passes through the second lens element 51b and is imaged as an intermediate image 15 of the projection image 18 at the first position S1. Thereby, even when the lens powers of the first lens element 51a and the second lens element 51b are increased to shorten the overall length of the first relay optical system 5, various aberrations generated by the first lens element 51a and the second lens element 51b can be suppressed by the power of the concave shape of the first transmission surface 52a.

[0060] The projection image 18 and the intermediate image 15 of the projection image 18 are each rectangular images having a first side 56 facing in the Y-axis direction (first direction) and a second side 57 facing in the Z-axis direction (second direction). The center line 56a parallel to the first side 56 of the projection image 18 does not overlap with the center line 56b parallel to the first side 56 of the intermediate image 15 of the projection image 18. The center line 57a parallel to the second side 57 of the projection image 18 does not overlap with the center line 57b parallel to the second side 57 of the intermediate image 15 of the projection image 18. Therefore, the positions of the dichroic prism 50 disposed between the light modulation element 3 and the lens member 51 and the light deflection element 9 disposed between the first position S1 and the lens member 51 can be arranged at positions offset from each other in the Y-axis direction and the Z-axis direction, so that the degree of freedom in the layout of the dichroic prism 50 and the light deflection element 9 can be increased.

[0061] The second relay optical system 6 includes a second reflecting surface 62b having a concave shape. Thereby, by folding the optical path of the second relay optical system 6, the whole of the second relay optical system 6 can be made compact. Further, since the optical path of the second relay optical system 6 is folded by the second reflecting surface 62b, chromatic aberration generated by folding the optical path can be suppressed.

[0062] The second relay optical system 6 includes a second reflecting member 62 having a second transmitting surface 62a having a negative power and a second reflecting surface 62b having a positive power. Thereby, it becomes easy to control the spread of the light reflected by the second reflecting surface 62b. Further, compared with the case where the second transmitting surface 62a and the second reflecting surface 62b are separate optical members, the component cost can be suppressed. Further, if the second reflecting member 62 and the first reflecting member 52 are common components, the component cost can be reduced.

[0063] The second relay optical system 6 includes a second dimming member 64 that is adjacent to the second transmission surface 62a on the incident side of the second transmission surface 62a and restricts the amount of light incident on the second reflecting member 62. Therefore, the light rays incident on the imaging device 8 can be evenly restricted. As a result, the dynamic range of the imaging image 19 formed on the imaging device 8 can be optimized.

[0064] The F number of the second relay optical system 6 is larger than the F number of the first relay optical system 5. Thereby, the contrast of the imaging image 19 formed on the imaging device 8 can be improved and the enlarged image projected on the screen S can be brightened. Also, since the second relay optical system 6 has a smaller light spread angle than the first relay optical system 5, the second relay optical system 6 can be miniaturized.

[0065] The light deflection element 9 includes a polarization beam splitter film 91. Thereby, the light deflection element 9 can make the optical paths of the imaging light LB emitted from the magnifying optical system 7 and the modulated light LA incident on the magnifying optical system 7 different according to the polarization components of the light rays. Also, since the modulated light LA emitted from the light modulation element 3 has uniform polarization components, imaging of the imaging image 19 and projection of the projection image 18 can be realized while maintaining the light amount of the modulated light LA.

[0066] [Embodiment 2] FIG. 9 is a schematic diagram of a main part of the projector 1A according to Embodiment 2. FIG. 10 is a diagram showing a schematic configuration of the optical system according to Embodiment 2. FIG. 11 is a schematic configuration diagram of a projection optical system for projecting modulated light in the optical system according to Embodiment 2. FIG. 12 is a schematic configuration diagram of an imaging optical system for forming imaging light in the optical system according to Embodiment 2. The projector 1A according to Embodiment 2 shown in FIG. 9 has an optical system 4A that is different from the projector 1 according to Embodiment 1. Therefore, in Embodiment 2, the same components as those in Embodiment 1 may be denoted by the same reference numerals and the description may be omitted.

[0067] As shown in FIG. 9, the optical system 4A includes a first relay optical system 5A, a magnifying optical system 7, a light deflection element 9, and a retardation plate 13. The first relay optical system 5A includes a dichroic prism 50.

[0068] As shown in FIG. 10, the optical system 4A includes a projection optical system 41 for projecting the modulated light LA shown in FIG. 11, and an imaging optical system 42 for forming an image of the imaging light LB shown in FIG. 12.

[0069] As shown in FIGS. 10 to 12, the magnifying optical system 7 includes 14 lenses L1 to L14. The lenses L1 to L14 are arranged in this order from the magnifying side to the reducing side. A diaphragm 75 is arranged between the lens L8 and the lens L9. The lens L4 and the lens L5 are a joined lens L21. The lens L7 and the lens L8 are a joined lens L22. The lens L11 and the lens L12 are a joined lens L23. The lens L1 has an aspherical shape on both surfaces. The lens L10 has an aspherical shape on both surfaces.

[0070] As shown in FIGS. 10 and 11, the first relay optical system 5A forms an intermediate image 15 that is the same magnification as the projection image 18 formed on the light modulation element 3 at the first position S1. The first position S1 is located between the retardation plate 13 and the first relay optical system 5A. The first relay optical system 5A includes, in the order in which the modulated light passes from the light modulation element 3 toward the first position S1, a dichroic prism 50, a first lens 511, a polarization beam splitter prism 512, a second lens 513, a retardation plate 514, a first reflecting member 515, a third lens 516, and a fourth lens 517. The dichroic prism 50 is located between the light modulation element 3 and the first lens 511 in the X1 direction of the light modulation element 3. Here, the first lens 511 and the second lens 513 constitute a first lens group, and the second lens 513, the third lens 516, and the fourth lens 517 constitute a second lens group.

[0071] The first lens 511 has a positive power. The polarization beam splitting prism 512 is arranged in the X1 direction of the first lens 511. The polarization beam splitting prism 512 includes a polarization separation film 512a. The polarization separation film 512a transmits one of the P-polarized component or the S-polarized component of the polarized components included in the light beam and reflects the other polarized component. In this form state, the polarization separation film 512a transmits the P-polarized component of the polarized components included in the light beam and reflects the S-polarized component.

[0072] The second lens 513 is arranged in the Y1 direction of the polarization beam splitting prism 512. The second lens 513 has a negative power. The second lens 513 has an aspherical shape on both surfaces. The retardation plate 514 is arranged in the Y1 direction of the second lens 513. The retardation plate 514 is a λ / 4 plate. The first reflecting member 515 is arranged in the Y1 direction of the retardation plate 514. The first reflecting member 515 includes a first reflecting surface 515a. The first reflecting surface 515a has a concave shape that is concave on the Y1 side. The first reflecting surface 515a has an aspherical shape. The third lens 516 and the fourth lens 517 are arranged in the Y2 direction of the polarization beam splitting prism 512. The third lens 516 and the fourth lens 517 are a cemented lens 518 that are cemented together. The cemented lens 518 has a positive power.

[0073] As shown in FIGS. 10 and 11, the retardation plate 13 is disposed on the magnification side of the first relay optical system 5A. The retardation plate 13 is a λ / 2 plate. As shown in FIGS. 10 to 12, the light deflection element 9 guides the imaging light LB from the magnification optical system 7 to the imaging device 8 and guides the modulated light LA from the first relay optical system 5A to the magnification optical system 7. The magnification optical system 7 is disposed in the X1 direction of the light deflection element 9, the imaging device 8 is disposed in the X2 direction, and the fourth lens 517 of the first relay optical system 5A is disposed in the Y1 direction. The light deflection element 9 includes a polarization beam splitter film 91. The polarization beam splitter film 91 transmits one of the P-polarized component and the S-polarized component of the polarization components included in the light beam and reflects the other polarization component. In the present embodiment, the polarization beam splitter film 91 transmits the S-polarized component of the polarization components included in the light beam and reflects the P-polarized component. Thereby, as shown in FIG. 11, the modulated light LA of the S-polarized component emitted from the first relay optical system 5A is reflected by the polarization beam splitter film 91 and enters the magnification optical system 7. Further, as shown in FIG. 12, the imaging light LB of the P-polarized component among the imaging light emitted from the magnification optical system 7 passes through the polarization beam splitter film 91 and enters the imaging device 8.

[0074] As shown in FIG. 11, the modulated light LA of the S polarization component emitted from the optical modulation element 3 passes through the dichroic prism 50 and the first lens 511 and reaches the polarization combining / splitting prism 512. The modulated light LA emitted from the first lens 511 is reflected by the polarization separation film 512a and reaches the second lens 513. The modulated light LA emitted from the second lens 513 becomes circularly polarized by passing through the retardation plate 514. The modulated light LA that has passed through the retardation plate 514 is reflected by the first reflecting surface 515a. The modulated light LA reflected by the first reflecting surface 515a becomes the P polarization component by passing through the retardation plate 514 again and reaches the polarization combining / splitting prism 512. The modulated light LA emitted from the retardation plate 514 passes through the polarization separation film 512a and the coupling lens 518 and forms an intermediate image 15 as an intermediate image at the first position S1. The modulated light LA that has passed through the first position S1 becomes the S polarization component by passing through the retardation plate 13 and reaches the light deflection element 9. The modulated light LA that has passed through the retardation plate 13 is reflected by the polarization separation film 91 and enters the magnifying optical system 7. As a result, the intermediate image 15 is projected as a magnified image onto the screen S by the magnifying optical system 7.

[0075] Further, the first relay optical system 5A may include a light control member that limits the amount of light incident on the first reflecting member on the side of the first reflecting surface 515a of the first reflecting member 515. As the light control member, a diaphragm that mechanically controls the amount of light, such as a light shielding plate, or a diaphragm that electrically controls the amount of light, such as a liquid crystal device, can be employed. Thereby, the contrast of the intermediate image 15 formed at the first position S1 can be improved. As a result, the contrast of the magnified image projected onto the screen S can be improved.

[0076] As shown in FIG. 12, the imaging light LB that enters from the magnifying side of the magnifying optical system 7 and exits from the reducing side reaches the light deflection element 9. Among the imaging light emitted from the magnifying optical system 7, the imaging light LB of the P polarization component passes through the polarization separation film 91 and is formed as an imaging image on the imaging element 8. The imaging element 8 receives the imaging image 19 formed by the imaging light LB of the P polarization component.

[0077] As shown in FIGS. 10 to 12, the reduced-side imaging surface of the magnifying optical system 7 is located at the first position S1. The reduced side of the magnifying optical system 7 is telecentric. Since the reduced side of the magnifying optical system 7 is telecentric, the chief ray of each ray passing through the reduced-side imaging surface is parallel or substantially parallel to the optical axis N of the reduced-side imaging surface. Further, the reduced-side imaging surface of the magnifying optical system 7 is also located at the position where the imaging element 8 is disposed.

[0078] As shown in FIG. 11, both sides of the first relay optical system 5A are telecentric. Therefore, the chief ray of each ray passing through the imaging surface at the first position S1 is parallel or substantially parallel to the optical axis N1 of the imaging surface at the first position S1. The chief ray of each ray passing through the imaging surface in the light modulation element 3 is parallel or substantially parallel to the optical axis N2 of the imaging surface in the light modulation element 3.

[0079] As shown in FIG. 12, since the reduced side of the magnifying optical system 7 is telecentric, the chief ray of each ray passing through the imaging surface in the imaging element 8 is parallel or substantially parallel to the optical axis N3 of the imaging surface in the imaging element 8. Here, in the present embodiment, the magnifying optical system 7 corresponds to the first optical system of the present invention.

[0080] (Lens data) The lens data of the projection optical system 41 shown in FIG. 11 is as follows. The surface numbers are assigned in order from the magnifying side to the reducing side. The symbols are the symbols of the screen, lens, light deflection element, lens, polarization beam splitter prism, dichroic prism, and light modulation element. The data of the surface numbers that do not correspond to the screen, lens, light deflection element, lens, polarization beam splitter prism, dichroic prism, and light modulation element are dummy data. The surfaces marked with * in the surface numbers are aspherical surfaces. R is the radius of curvature. D is the on-axis surface interval. Nd is the refractive index of the d-line. νd is the Abbe number of the d-line. Y is the effective radius. The units of R, D, and Y are mm.

[0081] Symbol Surface number R D nd vd Mode Y S 0 0.00000 2360.000000 Refraction L1 *1 -30.93600 3.800000 1.50942 55.88 Flexure 21.000 *2 -35.90900 0.400000 Flexure 19.556 L2 3 81.70000 2.000000 1.49700 81.54 Flexure 17.735 4 22.98300 12.400000 Flexure 15.392 L3 5 -31.21800 1.200000 1.49700 81.54 Flexure 14.911 6 118.38200 13.384000 Flexure 15.325 L4 7 176.01300 10.150000 1.83400 37.16 Flexure 17.641 L5 8 -29.89400 1.300000 1.84666 23.78 Flexure 17.802 9 -103.47100 0.200000 Flexure 18.099 L6 10 83.27600 4.320000 1.84666 23.78 Flexure 18.000 11 -298.53100 33.534000 Flexure 17.796 L7 12 63.55500 5.580000 1.77250 49.60 Flexure 11.502 L8 13 -43.02500 1.100000 1.72825 28.46 Flexure 10.945 14 1804.82100 2.873000 Flexure 10.461 L9,75 15 -38.34400 1.000000 1.76182 26.52 Flexure 10.000 16 75.19100 5.832000 Flexure 9.776 L10 *17 -217.03500 4.360000 1.74320 49.29 Flexure 9.777 *18 -29.41800 1.830000 Flexure 10.000 L11 19 -32.01900 1.200000 1.69895 30.13 Flexure 10.108 L12 20 34.78000 7.550000 1.49700 81.54 Flexure 11.067 21 -41.76900 0.200000 Flexure 12.227 L13 22 87.93800 4.850000 1.80809 22.76 Flexure 13.114 23 -86.87400 0.500000 Flexure 13.356 L14 24 170.53700 5.170000 1.59522 67.74 Flexure 13.417 25 -55.33000 5.119637 Flexure 13.385 9 26 0.00000 16.000000 1.51680 64.17 Flexure 12.318 91 27 0.00000 -16.000000 1.51680 64.17 Reflection 14.448 28 0.00000 -5.000000 Flexure 9.331 517 29 -37.80107 -8.000000 1.80420 46.50 Flexure 9.179 516 30 -20.90626 -8.000000 1.67011 23.90 Flexure 9.087 31 84.38721 -5.000000 Flexure 9.289 512 32 0.00000 -20.000000 1.51680 64.17 Flexure 9.326 512a 33 0.00000 -20.000000 1.51680 64.17 Flexure 11.161 34 0.00000 -0.644094 Flexure 14.565 513 *35 -98.23961 -5.000000 1.50940 56.47 Flexure 14.871 *36 -110.57456 -19.438469 Flexure 15.756 515a *37 82.97883 19.438469 Reflection 20.083 513 *38 -110.57456 5.000000 1.50940 56.47 Refraction 16.356 *39 -98.23961 0.644094 Refraction 15.562 512 40 0.00000 20.000000 1.51680 64.17 Refraction 15.306 512a 41 0.00000 -20.000000 1.51680 64.17 Reflection 20.000 42 0.00000 -1.000000 Refraction 14.381 511 43 -181.66230 -4.338165 1.77223 47.70 Refraction 14.419 44 80.74054 -2.000000 Refraction 14.368 50 45 0.00000 -32.000000 1.51680 64.20 Refraction 13.768 46 0.00000 -8.705166 Refraction 10.171 3 47 0.00000 0.000000 Refraction 8.838

[0082] The aspherical coefficients are as follows.

[0083] Surface number 1 2 17 18 Conic constant -7.43E+00 -8.549E+00 -2.00E+00 5.52E-01 Fourth-order coefficient 2.575429E-05 2.508628E-05 -1.189732E-05 -1.887723E-06 Sixth-order coefficient -3.724959E-08 -3.314652E-08 -5.17632E-09 -6.584551E-09 Eighth-order coefficient 3.59918E-11 1.242655E-11 -4.937693E-10 -2.484272E-10 Coefficient of 10th order: 9.857151E-15, 6.209172E-14, 2.55588E-12, -7.155889E-13 Coefficient of 12th order: -3.080937E-17, -4.717475E-17, -3.480507E-15, 1.826607E-14 Coefficient of 14th order: 1.074993E-20, -2.316431E-20, -8.166188E-17, -1.164168E-16

[0084] Face number: 35, 36, 37 Conic constant: 0, 0, -1.00E+00 Coefficient of 4th order: 1.201655E-05, 1.051619E-05, 8.382102E-08 Coefficient of 6th order: 2.746810E-09, 2.638418E-09, -6.123083E-11 Coefficient of 8th order: 1.094746E-11, 4.371560E-12, -5.053909E-13 Coefficient of 10th order: -3.531471E-14, -2.640316E-14, 1.061247E-15

[0085] Face number: 38, 39 Conic constant: 0, 0 Coefficient of 4th order: 1.051619E-05, 1.201655E-05 Coefficient of 6th order: 2.638418E-09, 2.746810E-09 Coefficient of 8th order: 4.371560E-12, 1.094746E-11 Coefficient of 10th order: -2.640316E-14, -3.531471E-14

[0086] The lens data of the imaging optical system 42 shown in FIG. 12 is as follows. The surface numbers are assigned in order from the magnifying side to the reducing side. The symbols are the symbols of the screen, lens, light deflection element, and imaging element. The data of the surface numbers that do not correspond to the screen, lens, light deflection element, and imaging element are dummy data. The surfaces marked with * are aspherical surfaces. R is the radius of curvature. D is the axial surface interval. Nd is the refractive index of the d-line. νd is the Abbe number of the d-line. Y is the effective radius. The units of R, D, and Y are mm.

[0087] Symbol Surface number R D nd vd Mode Y S 0 0.00000 2360.000000 Refraction L1 *1 -30.93600 3.800000 1.50942 55.88 Refraction 21.000 *2 -35.90900 0.400000 Refraction 19.556 L2 3 81.70000 2.000000 1.49700 81.54 Refraction 17.735 4 22.98300 12.400000 Refraction 15.392 L3 5 -31.21800 1.200000 1.49700 81.54 Refraction 14.911 6 118.38200 13.384000 Refraction 15.325 L4 7 176.01300 10.150000 1.83400 37.16 Refraction 17.641 L5 8 -29.89400 1.300000 1.84666 23.78 Refraction 17.802 9 -103.47100 0.200000 Refraction 18.099 L6 10 83.27600 4.320000 1.84666 23.78 Refraction 18.000 11 -298.53100 33.534000 Refraction 17.796 L7 12 63.55500 5.580000 1.77250 49.60 Refraction 11.502 L8 13 -43.02500 1.100000 1.72825 28.46 Inflection 10.945 14 1804.82100 2.873000 Inflection 10.461 L9,75 15 -38.34400 1.000000 1.76182 26.52 Inflection 10.000 16 75.19100 5.832000 Inflection 9.776 L10 *17 -217.03500 4.360000 1.74320 49.29 Inflection 9.777 *18 -29.41800 1.830000 Inflection 10.000 L11 19 -32.01900 1.200000 1.69895 30.13 Inflection 10.108 L12 20 34.78000 7.550000 1.49700 81.54 Inflection 11.067 21 -41.76900 0.200000 Inflection 12.227 L13 22 87.93800 4.850000 1.80809 22.76 Inflection 13.114 23 -86.87400 0.500000 Inflection 13.356 L14 24 170.53700 5.170000 1.59522 67.74 Inflection 13.417 25 -55.33000 5.119637 Inflection 13.385 9 26 0.00000 16.000000 1.51680 64.17 Inflection 10.417 91 27 0.00000 16.000000 1.51680 64.17 Inflection 10.417 28 0.00000 4.200000 Inflection 5.495 8 29 0.00000 0.000000 Inflection 4.503

[0088] The aspherical coefficients are as follows.

[0089] Surface number 1 2 17 18 Conic constant -7.43E+00 -8.549E+00 -2.00E+00 5.52E-01 Coefficient of the fourth order 2.575429E-05 2.508628E-05 -1.189732E-05 -1.887723E-06 Coefficient of the sixth order -3.724959E-08 -3.314652E-08 -5.17632E-09 -6.584551E-09 Coefficient of the eighth order 3.59918E-11 1.242655E-11 -4.937693E-10 -2.484272E-10 Coefficient of the tenth order 9.857151E-15 6.209172E-14 2.55588E-12 -7.155889E-13 Coefficient of the twelfth order -3.080937E-17 -4.717475E-17 -3.480507E-15 1.826607E-14 Coefficient of the fourteenth order 1.074993E-20 -2.316431E-20 -8.166188E-17 -1.164168E-16

[0090] FIG. 13 is a diagram showing the MTF on the reduction side of the projection optical system 41. FIG. 14 is a diagram showing the MTF on the reduction side of the imaging optical system 42. As shown in FIG. 13, the projection optical system 41 has high resolution. As shown in FIG. 14, the imaging optical system 42 has high resolution.

[0091] (Function and effect) The projector 1A has a light deflector 9 that guides the imaging light LB from the magnifying optical system 7 to the image sensor 8 and guides the modulated light LA from the light modulation element 3 to the magnifying optical system 7. The imaging light LB passes through the magnifying optical system 7, the light deflector 9, and the image sensor 8 in this order. As a result, the imaging light LB from the magnifying optical system 7 reaches the image sensor 8 only by passing through the light deflector 9, so that the imaged image 19 formed on the image sensor 8 has high image quality. Also, the amount of the imaging light LB reaching the image sensor 8 can be ensured.

[0092] The reduction side of the magnifying optical system 7 of the projector 1A is telecentric. The magnifying optical system 7 of the projector 1A is replaceable with respect to the first relay optical system 5A. Therefore, the projector 1A can obtain the same operational effects as the projector 1 of Embodiment 1.

[0093] Both sides of the first relay optical system 5A are telecentric. The side of the magnifying optical system 7 that forms the imaging light LB on the imaging device 8 is telecentric with respect to the imaging device 8. Therefore, the projector 1A can obtain the same operational effects as the projector 1 of Embodiment 1.

[0094] The first relay optical system 5A forms an intermediate image 15 that is the same magnification as the projection image 18 formed on the light modulation element 3 at the first position S1. The projection image 18 and the imaging image 19 are the same size. Therefore, the projector 1A can obtain the same operational effects as the projector 1 of Embodiment 1.

[0095] The first relay optical system 5A includes a first reflecting surface 52b having a concave shape. The first relay optical system 5A includes a first reflecting member 52 having a first transmitting surface 52a with negative power and a first reflecting surface 52b with positive power. Therefore, the projector 1A can obtain the same operational effects as the projector 1 of Embodiment 1.

[0096] The light deflection element 9 includes a polarization beam splitter film 91. Therefore, the projector 1A can obtain the same operational effects as the projector 1 of Embodiment 1.

[0097] [Embodiment 3] FIG. 15 is a schematic diagram of the main part of the projector 1B according to Embodiment 3. FIG. 16 is a diagram showing a schematic configuration of the optical system according to Embodiment 3. FIG. 17 is a schematic configuration diagram of a projection optical system for projecting modulated light in the optical system according to Embodiment 3. FIG. 18 is a schematic configuration diagram of an imaging optical system for forming an image of imaging light in the optical system according to Embodiment 2. The projector 1B according to Embodiment 3 shown in FIG. 15 is different from the projector 1 according to Embodiment 1 in that the optical system 4B is different. Therefore, in Embodiment 3, the same components as those in Embodiment 1 may be denoted by the same reference numerals and the description thereof may be omitted.

[0098] In this embodiment, the imaging light LB is infrared light, and the imaging element 8 receives an image formed by the infrared light. As shown in FIG. 15, the optical system 4B includes a first relay optical system 5B, an enlargement optical system 7, and a light deflection element 9. The first relay optical system 5B includes a dichroic prism 50. The light deflection element 9 is disposed inside the first relay optical system 5B.

[0099] As shown in FIG. 16, the optical system 4 includes a projection optical system 41 for projecting the modulated light LA shown in FIG. 17 and an imaging optical system 42 for forming an image of the imaging light LB shown in FIG. 18.

[0100] As shown in FIGS. 16 to 18, the enlargement optical system 7 includes 14 lenses L1 to L14 and a prism 71. The lenses L1 to L14 are arranged in this order from the enlargement side to the reduction side. The prism 71 is disposed on the reduction side of the lens L14. An aperture 75 is disposed between the lens L8 and the lens L9. The lenses L4 and L5 are a joined lens L21 joined together. The lenses L7 and L8 are a joined lens L22 joined together. The lenses L11 and L12 are a joined lens L23 joined together. The lens L1 has an aspherical shape on both surfaces. The lens L10 has an aspherical shape on both surfaces.

[0101] As shown in FIGS. 16 and 17, the first relay optical system 5B forms an intermediate image 15 of the same magnification as the projected image 18 formed on the light modulation element 3 at the first position S1. The first position S1 is located between the first relay optical system 5B and the magnifying optical system 7. The first relay optical system 5B includes, in the order in which the modulated light passes from the light modulation element 3 toward the first position S1, a dichroic prism 50, a first lens 521, a second lens 522, a polarization beam splitting prism 523, a third lens 524, a retardation plate 525, a first reflecting member 526, a fourth lens 527, and a fifth lens 528. The light deflector 9 is disposed between the dichroic prism 50 and the first lens 521 in the optical path through which the modulated light LA passes. The first relay optical system 5B further includes a prism 530 disposed in the Y1 direction of the light deflector 9. Here, the first lens 521, the second lens 522, and the third lens 524 constitute the first lens group, and the third lens 524, the fourth lens 527, and the fifth lens 528 constitute the second lens group.

[0102] The dichroic prism 50 is located between the light modulation element 3 and the light deflector 9 in the X1 direction of the light modulation element 3. The first lens 521 is disposed in the Y2 direction of the light deflector 9. The first lens 521 has a positive power. The second lens 522 is disposed in the Y2 direction of the first lens 521. The second lens 522 has a positive power. The polarization beam splitting prism 523 is disposed in the Y2 direction of the second lens 522. The polarization beam splitting prism 523 includes a polarization splitting film 523a. The polarization splitting film 523a transmits one of the P-polarized component or the S-polarized component of the polarization components included in the light beam and reflects the other polarization component. In this embodiment, the polarization splitting film 523a transmits the S-polarized component of the polarization components included in the light beam and reflects the P-polarized component.

[0103] The third lens 524 is arranged in the X2 direction of the polarization beam splitter prism 523. The third lens 524 has a negative power. The third lens 524 has an aspherical shape on both sides. The retardation plate 525 is arranged in the X2 direction of the third lens 524. The retardation plate 525 is a λ / 4 plate. The first reflecting member 526 is arranged in the X2 direction of the retardation plate 525. The first reflecting member 526 has a first reflecting surface 526a. The first reflecting surface 526a has a concave shape that is recessed on the X2 side. The first reflecting surface 526a has an aspherical shape.

[0104] The fourth lens 527 is arranged in the X1 direction of the polarization beam splitter prism 523. The fourth lens 527 has a positive power. The fifth lens 528 is arranged in the X1 direction of the fourth lens 527. The fifth lens 528 has a negative power.

[0105] As shown in FIGS. 16 to 18, the light deflection element 9 guides the imaging light LB from the magnifying optical system 7 to the imaging element 8, and guides the modulated light LA from the light modulation element 3 to the magnifying optical system 7. A first lens 521 is arranged in the Y1 direction of the light deflection element 9, the light modulation element 3 is arranged in the X2 direction, and the imaging element 8 is arranged in the Y1 direction. The light deflection element 9 includes a wavelength separation film 95. The wavelength separation film 95 transmits one of infrared light and visible light and reflects the other. In this embodiment, the wavelength separation film 95 transmits the infrared light, which is the imaging light LB, and reflects the visible light, which is the modulated light LA. Thereby, as shown in FIG. 17, the modulated light LA, which is visible light emitted from the dichroic prism 50, is reflected by the wavelength separation film 95 and enters the magnifying optical system 7. Further, as shown in FIG. 18, the infrared light, which is the imaging light LB emitted from the magnifying optical system 7, passes through the wavelength separation film 95 and enters the imaging element 8. The wavelength of the visible light transmitted by the wavelength separation film 95 is 420 to 680 nm, and the wavelengths of the infrared light reflected by the wavelength separation film 95 are 850 nm and 940 nm.

[0106] The prism 530 has the same optical characteristics as the dichroic prism 50. The prism 530 equalizes the optical distance between the imaging element 8 and the light deflection element 9 and the optical distance between the light modulation element 3 and the light deflection element 9. As a result, as shown in FIG. 18, the first relay optical system 5B forms an intermediate image 16 that is the same magnification as the imaging image 19 formed by the imaging element 8 at the first position S1. Therefore, the projection image 18, the intermediate image 15, the intermediate image 16, and the imaging image 19 are the same size.

[0107] In this embodiment, the dichroic prism 50, the light deflection element 9, and the prism 530 constitute an integrated prism block 14. Thereby, since the dichroic prism 50, the light deflection element 9, and the prism 530 can be configured by one prism block 14, the assembly accuracy of the components can be improved. Note that the dichroic prism 50, the light deflection element 9, and the prism 530 may be separate members.

[0108] As shown in FIG. 17, the modulated light LA of the S-polarization component emitted from the light modulation element 3 passes through the dichroic prism 50 and reaches the light deflection element 9. The modulated light LA emitted from the dichroic prism 50 is reflected by the wavelength separation film 95, passes through the first lens 521 and the second lens 522, and reaches the polarization combining / splitting prism 523. The modulated light LA emitted from the second lens 522 is reflected by the polarization separation film 523a and reaches the third lens 524.

[0109] The modulated light LA emitted from the third lens 524 becomes circularly polarized by passing through the retardation plate 525. The modulated light LA that has passed through the retardation plate 525 is reflected by the first reflecting surface 526a. The modulated light LA reflected by the first reflecting surface 526a becomes a P-polarized component by passing through the retardation plate 525 again and reaches the polarization combining and separating prism 523. The modulated light LA emitted from the retardation plate 525 passes through the polarization separation film 523a, the fourth lens 527, and the fifth lens 528, and forms an intermediate image 15 as an intermediate image at the first position S1. The modulated light LA that has passed through the first position S1 enters the magnifying optical system 7. As a result, the intermediate image 15 is projected as an enlarged image onto the screen S by the magnifying optical system 7.

[0110] As shown in FIG. 18, the imaging light LB that enters from the magnifying side of the magnifying optical system 7 and exits from the reducing side passes through the fifth lens 528 and the fourth lens 527 and reaches the polarization combining and separating prism 523. At this time, the imaging light LB that enters from the magnifying side of the magnifying optical system 7 and exits from the reducing side forms an intermediate image 16 as an intermediate image at the first position S1. Among the imaging light LB of the P-polarized component among the imaging light emitted from the magnifying optical system 7, it passes through the polarization separation film 523a and reaches the third lens 524.

[0111] The imaging light LB emitted from the third lens 524 becomes circularly polarized by passing through the retardation plate 525. The imaging light LB that has passed through the retardation plate 525 is reflected by the first reflecting surface 526a. The imaging light LB reflected by the first reflecting surface 526a passes through the retardation plate 525 again and thus becomes an S-polarized component and reaches the polarization combining and separating prism 523. The imaging light LB emitted from the retardation plate 525 is reflected by the polarization separation film 523a, passes through the second lens 522 and the first lens 521, and reaches the light deflection element 9. The imaging light LB emitted from the first lens 521 passes through the wavelength separation film 95 and the prism 530 and forms a focused image as a focused image on the imaging element 8. The imaging element 8 receives the focused image 19 on which the imaging light LB of the S-polarized component is focused.

[0112] Further, the first relay optical system 5B may include a light control member that restricts the amount of light incident on the first reflection member on the first reflection surface 526a side of the first reflection member 526. As the light control member, a diaphragm that mechanically controls the amount of light, such as a light shielding plate, or a diaphragm that electrically controls the amount of light, such as a liquid crystal device, can be adopted. Thereby, the contrast of the intermediate image 15 formed at the first position S1 can be improved. As a result, the contrast of the enlarged image projected on the screen S can be improved. Also, the light rays incident on the imaging device 8 can be evenly restricted. Thereby, the dynamic range of the imaging image 19 formed on the imaging device 8 can be optimized.

[0113] As shown in FIGS. 16 to 18, the reduction-side imaging surface of the enlargement optical system 7 is located at the first position S1. The reduction side of the enlargement optical system 7 is telecentric. Since the reduction side of the enlargement optical system 7 is telecentric, the chief rays of the respective light rays passing through the reduction-side imaging surface are parallel or substantially parallel to the optical axis N of the reduction-side imaging surface.

[0114] As shown in FIGS. 17 and 18, both sides of the first relay optical system 5B are telecentric. Therefore, the chief rays of the respective light rays passing through the imaging surface at the first position S1 are parallel or substantially parallel to the optical axis N1 of the imaging surface at the first position S1. The chief rays of the respective light rays passing through the imaging surface of the light modulation element 3 are parallel or substantially parallel to the optical axis N2 of the imaging surface of the light modulation element 3. The chief rays of the respective light rays passing through the imaging surface of the imaging device 8 are parallel or substantially parallel to the optical axis N3 of the imaging surface of the imaging device 8. Here, in the present embodiment, the first relay optical system 5B corresponds to the first optical system of the present invention.

[0115] (Lens data) The lens data of the projection optical system 41 shown in Fig. 17 is as follows. The surface numbers are assigned in order from the magnifying side to the reducing side. The symbols are the symbols for the screen, lens, prism, lens, prism, lens, optical deflection element, dichroic prism, and optical modulation element. The data for the surface numbers that do not correspond to the screen, lens, prism, lens, prism, lens, optical deflection element, dichroic prism, and optical modulation element are dummy data. The surfaces marked with * are aspherical surfaces. R is the radius of curvature. D is the axial surface interval. Nd is the refractive index of the d-line. νd is the Abbe number of the d-line. Y is the effective radius. The units of R, D, and Y are mm.

[0116] Symbol Surface number R D nd vd Mode Y S 0 0.00000 2360.000000 Refraction L1 *1 -30.93600 3.800000 1.50942 55.88 Refraction 21.000 *2 -35.90900 0.400000 Refraction 19.556 L2 3 81.70000 2.000000 1.49700 81.54 Refraction 17.735 4 22.98300 12.400000 Refraction 15.392 L3 5 -31.21800 1.200000 1.49700 81.54 Refraction 14.911 6 118.38200 13.384000 Refraction 15.325 L4 7 176.01300 10.150000 1.83400 37.16 Refraction 17.641 L5 8 -29.89400 1.300000 1.84666 23.78 Refraction 17.802 9 -103.47100 0.200000 Refraction 18.099 L6 10 83.27600 4.320000 1.84666 23.78 Refraction 18.000 11 -298.53100 33.534000 Refraction 17.796 L7 12 63.55500 5.580000 1.77250 49.60 Inflection 11.502 L8 13 -43.02500 1.100000 1.72825 28.46 Inflection 10.945 14 1804.82100 2.873000 Inflection 10.461 L9,75 15 -38.34400 1.000000 1.76182 26.52 Inflection 10.000 16 75.19100 5.832000 Inflection 9.776 L10 *17 -217.03500 4.360000 1.74320 49.29 Inflection 9.777 *18 -29.41800 1.830000 Inflection 10.000 L11 19 -32.01900 1.200000 1.69895 30.13 Inflection 10.108 L12 20 34.78000 7.550000 1.49700 81.54 Inflection 11.067 21 -41.76900 0.200000 Inflection 12.227 L13 22 87.93800 4.850000 1.80809 22.76 Inflection 13.114 23 -86.87400 0.500000 Inflection 13.356 L14 24 170.53700 5.170000 1.59522 67.74 Inflection 13.417 25 -55.33000 5.119637 Inflection 13.385 71 26 0.00000 32.000000 1.51680 64.17 Inflection 12.239 27 0.00000 9.189561 Inflection 9.289 528 28 39.41593 12.000000 1.77250 49.62 Inflection 10.002 29 37.12254 4.803539 Inflection 9.988 527 30 69.46159 12.000000 1.58144 40.89 Inflection 11.093 31 -73.57415 15.000000 Inflection 12.107 523 32 0.00000 26.000000 1.51680 64.17 Inflection 15.175 523a 33 0.00000 26.000000 1.51680 64.17 Inflection 19.172 34 0.00000 2.000000 Inflection 23.196 524 *35 63.18083 5.000000 1.50940 56.47 Inflection 24.616 *36 59.71497 10.000000 Inflection 24.982 526a *37 -117.95288 -10.000000 Reflection 25.728 524 *38 59.71497 -5.000000 1.50940 56.47 Inflection 25.216 *39 63.18083 -2.000000 Inflection 25.093 523 40 0.00000 -26.000000 1.51680 64.17 Inflection 24.106 523a 41 0.00000 26.000000 1.51680 64.17 Reflection 32.663 42 0.00000 0.100000 Inflection 18.596 522 43 106.34979 6.100930 1.49700 81.61 Inflection 18.324 44 -105.71672 0.100000 Inflection 17.829 521 45 320.35200 2.262085 1.58144 40.89 Inflection 17.089 46 1868.83177 0.100000 Inflection 16.640 9 47 0.00000 21.000000 1.51680 64.20 Inflection 16.630 95 48 0.00000 -21.000000 1.51680 64.20 Reflection 21.620 50 49 0.00000 -32.000000 1.51680 64.20 Refraction 11.607 50 0.00000 -3.812973 Refraction 9.193 3 51 0.00000 0.000000 Refraction 8.833

[0117] The aspherical coefficients are as follows.

[0118] Surface number 1 2 17 18 Conic constant -7.43E+00 -8.549E+00 -2.00E+00 5.52E-01 Fourth-order coefficient 2.575429E-05 2.508628E-05 -1.189732E-05 -1.887723E-06 Sixth-order coefficient -3.724959E-08 -3.314652E-08 -5.17632E-09 -6.584551E-09 Eighth-order coefficient 3.59918E-11 1.242655E-11 -4.937693E-10 -2.484272E-10 Tenth-order coefficient 9.857151E-15 6.209172E-14 2.55588E-12 -7.155889E-13 Twelfth-order coefficient -3.080937E-17 -4.717475E-17 -3.480507E-15 1.826607E-14 Fourteenth-order coefficient 1.074993E-20 -2.316431E-20 -8.166188E-17 -1.164168E-16

[0119] Surface number 35 36 37 Conic constant -1.00E+00 -1.00E+00 -1.00E+00 Fourth-order coefficient -2.230389E-06 -2.316343E-06 2.049472E-08 Coefficients of the 6th degree -2.206091E-10 -3.306150E-10 5.756230E-11 Coefficients of the 8th degree 3.728125E-13 5.687054E-13 7.644694E-14 Coefficients of the 10th degree -5.403157E-16 -3.680130E-16 -1.804365E-16

[0120] Face numbers 38 39 Conic constants -1.00E+00 -1.00E+00 Coefficients of the 4th degree -2.316343E-06 -2.230389E-06 Coefficients of the 6th degree -3.306150E-10 -2.206091E-10 Coefficients of the 8th degree 5.687054E-13 3.728125E-13 Coefficients of the 10th degree -3.680130E-16 -5.403157E-16

[0121] The lens data of the imaging optical system 42 shown in FIG. 18 is as follows. The face numbers are assigned in order from the magnifying side to the reducing side. The symbols are the symbols of the screen, lens, prism, lens, prism, lens, light deflection element, prism, and imaging element. The data of the face numbers not corresponding to the screen, lens, prism, lens, prism, lens, light deflection element, prism, and imaging element are dummy data. The faces marked with * in the face numbers are aspherical surfaces. R is the radius of curvature. D is the axial distance between surfaces. Nd is the refractive index of the d-line. νd is the Abbe number of the d-line. Y is the effective radius. The units of R, D, and Y are mm.

[0122] Symbol Face number R D nd vd Mode Y S 0 0.00000 2360.000000 Refraction L1 *1 -30.93600 3.800000 1.50942 55.88 Refraction 21.000 *2 -35.90900 0.400000 Refraction 19.556 L2 3 81.70000 2.000000 1.49700 81.54 Inflection 17.735 4 22.98300 12.400000 Inflection 15.392 L3 5 -31.21800 1.200000 1.49700 81.54 Inflection 14.911 6 118.38200 13.384000 Inflection 15.325 L4 7 176.01300 10.150000 1.83400 37.16 Inflection 17.641 L5 8 -29.89400 1.300000 1.84666 23.78 Inflection 17.802 9 -103.47100 0.200000 Inflection 18.099 L6 10 83.27600 4.320000 1.84666 23.78 Inflection 18.000 11 -298.53100 33.534000 Inflection 17.796 L7 12 63.55500 5.580000 1.77250 49.60 Inflection 11.502 L8 13 -43.02500 1.100000 1.72825 28.46 Inflection 10.945 14 1804.82100 2.873000 Inflection 10.461 L9,75 15 -38.34400 1.000000 1.76182 26.52 Inflection 10.000 16 75.19100 5.832000 Inflection 9.776 L10 *17 -217.03500 4.360000 1.74320 49.29 Inflection 9.777 *18 -29.41800 1.830000 Inflection 10.000 L11 19 -32.01900 1.200000 1.69895 30.13 Inflection 10.108 L12 20 34.78000 7.550000 1.49700 81.54 Inflection 11.067 21 -41.76900 0.200000 Inflection 12.227 L13 22 87.93800 4.850000 1.80809 22.76 Inflection 13.114 23 -86.87400 0.500000 Inflection 13.356 L14 24 170.53700 5.170000 1.59522 67.74 Inflection 13.417 25 -55.33000 5.119637 Inflection 13.385 71 26 0.00000 32.000000 1.51680 64.17 Inflection 12.239 27 0.00000 9.189561 Inflection 9.289 528 28 39.41593 12.000000 1.77250 49.62 Inflection 10.002 29 37.12254 4.803539 Inflection 9.988 527 30 69.46159 12.000000 1.58144 40.89 Inflection 11.093 31 -73.57415 15.000000 Inflection 12.107 523 32 0.00000 26.000000 1.51680 64.17 Inflection 15.175 523a 33 0.00000 26.000000 1.51680 64.17 Inflection 19.172 34 0.00000 2.000000 Inflection 23.196 524 *35 63.18083 5.000000 1.50940 56.47 Inflection 24.616 *36 59.71497 10.000000 Inflection 24.982 526a *37 -117.95288 -10.000000 Reflection 25.728 524 *38 59.71497 -5.000000 1.50940 56.47 Inflection 25.216 *39 63.18083 -2.000000 Inflection 25.093 523 40 0.00000 -26.000000 1.51680 64.17 Inflection 24.106 523a 41 0.00000 26.000000 1.51680 64.17 Reflection 32.663 42 0.00000 0.100000 Inflection 18.596 522 43 106.34979 6.100930 1.49700 81.61 Inflection 18.324 44 -105.71672 0.100000 Inflection 17.829 521 45 320.35200 2.262085 1.58144 40.89 Inflection 17.089 46 1868.83177 0.100000 Inflection 16.640 9 47 0.00000 21.000000 1.51680 64.20 Inflection 16.630 95 48 0.00000 21.000000 1.51680 64.20 Reflection 21.620 530 49 0.00000 32.000000 1.51680 64.20 Inflection 11.607 50 0.00000 3.812973 Inflection 9.193 8 51 0.00000 0.000000 Inflection 8.833

[0123] The aspherical coefficients are as follows.

[0124] Surface number 1 2 17 18 Conic constant -7.43E+00 -8.549E+00 -2.00E+00 5.52E-01 Fourth-order coefficient 2.575429E-05 2.508628E-05 -1.189732E-05 -1.887723E-06 Sixth-order coefficient -3.724959E-08 -3.314652E-08 -5.17632E-09 -6.584551E-09 Coefficient of 8th degree: 3.59918E-11, 1.242655E-11, -4.937693E-10, -2.484272E-10 Coefficient of 10th degree: 9.857151E-15, 6.209172E-14, 2.55588E-12, -7.155889E-13 Coefficient of 12th degree: -3.080937E-17, -4.717475E-17, -3.480507E-15, 1.826607E-14 Coefficient of 14th degree: 1.074993E-20, -2.316431E-20, -8.166188E-17, -1.164168E-16

[0125] Face numbers: 35, 36, 37 Conic constant: -1.00E+00, -1.00E+00, -1.00E+00 Coefficient of 4th degree: -2.230389E-06, -2.316343E-06, 2.049472E-08 Coefficient of 6th degree: -2.206091E-10, -3.306150E-10, 5.756230E-11 Coefficient of 8th degree: 3.728125E-13, 5.687054E-13, 7.644694E-14 Coefficient of 10th degree: -5.403157E-16, -3.680130E-16, -1.804365E-16

[0126] Face numbers: 38, 39 Conic constant: -1.00E+00, -1.00E+00 Coefficient of 4th degree: -2.316343E-06, -2.230389E-06 Coefficient of 6th degree: -3.306150E-10, -2.206091E-10 Coefficient of 8th degree: 5.687054E-13, 3.728125E-13 Coefficient of 10th degree: -3.680130E-16, -5.403157E-16

[0127] FIG. 19 is a diagram showing the MTF on the reduction side of the projection optical system 41. FIG. 19 is a diagram showing the MTF on the reduction side of the imaging optical system 42. As shown in FIG. 19, the projection optical system 41 has high resolution. As shown in FIG. 20, the imaging optical system 42 has high resolution.

[0128] (Function and effect) The projector 1B has a light deflection element 9 that guides the imaging light LB from the magnifying optical system 7 to the imaging element 8 and guides the modulated light LA from the light modulation element 3 to the magnifying optical system 7. The imaging light LB passes through the magnifying optical system 7, the first position S1, the first relay optical system 5B, the light deflection element 9, and the imaging element 8 in this order. The modulated light LA passes through the light modulation element 3, the light deflection element 9, the first relay optical system 5B, the first position S1, and the magnifying optical system 7 in this order. Thereby, since the imaging element 8 and the light modulation element 3 are arranged near the light deflection element 9, even when the shape of the light deflection element 9 changes due to a temperature change, the optical characteristics with respect to the imaging element 8 and the light modulation element 3 are less likely to change.

[0129] The first relay optical system 5B forms an intermediate image 16 of the imaging image 19 at the first position S1. Thereby, since the intermediate image 16 of the imaging image 19 and the intermediate image 15 of the projection image 18 can be formed by one first relay optical system 5B, the entire optical system can be made compact.

[0130] The light deflection element 9 includes a wavelength separation film 95. Thereby, the light deflection element 9 can make the optical paths of the imaging light LB emitted from the magnifying optical system 7 and the modulated light LA incident on the magnifying optical system 7 different according to the wavelength band of the light. Further, when the imaging light LB is infrared light and the modulated light LA is visible light, the imaging light LB is not affected by the stray light and ghost light of the modulated light LA generated in the magnifying optical system 7, so that the imaging element 8 can receive a clear imaging image 19.

[0131] The reduction side of the magnifying optical system 7 of the projector 1B is telecentric. The magnifying optical system 7 of the projector 1B is replaceable with respect to the first relay optical system 5B. Therefore, the projector 1A can obtain the same operational effects as the projector 1 of Embodiment 1.

[0132] Both sides of the first relay optical system 5B are telecentric. The first optical system that forms the imaging light LB on the imaging element 8 is the first relay optical system 5B. Therefore, the projector 1B can obtain the same operational effects as the projector 1 of Embodiment 1.

[0133] The first relay optical system 5B forms an intermediate image 15 that is the same magnification as the projection image 18 formed on the light modulation element 3 at the first position S1. The projection image 18 and the imaging image 19 are the same size. Therefore, the projector 1B can obtain the same operational effects as the projector 1 of Embodiment 1.

[0134] The first relay optical system 5B includes a first reflecting surface 52b having a concave shape. The first relay optical system 5A includes a first reflecting member 52 having a first transmitting surface 52a with negative power and a first reflecting surface 52b with positive power. Therefore, the projector 1B can obtain the same operational effects as the projector 1 of Embodiment 1.

[0135] [Modification Example] In Practical Embodiment 1, the light deflection element 9 included a polarization beam splitter film 91, but in a modification of Embodiment 1 example, the light deflection element 9 includes a wavelength separation film. In this case, it is possible to prevent a decrease in the amount of light of the imaging light LB due to the separation of polarization components.

[0136] In a modification of Embodiment 1, the projector 1 includes a lens disposed at the first position S1 and a shift mechanism that shifts the lens in a direction orthogonal to the optical axis. In this way, the projection range and the imaging range on the screen S can be moved by the shift mechanism.

[0137] In the actual situation 2, the light deflection element 9 included a polarization separation film 91. However, in a modification of the second embodiment, the light deflection element 9 includes a wavelength separation film. In this case, it is possible to prevent a decrease in the amount of imaging light LB due to the separation of polarization components. Further, since the retardation plate 13 becomes unnecessary, the utilization efficiency of the modulated light LA can be improved and the cost can be reduced.

[0138] In a modification of the third embodiment, the projector 1B includes a lens disposed at the first position S1 and a shift mechanism that shifts the lens in a direction orthogonal to the optical axis. In this way, the projection range and the imaging range on the screen S can be moved by the shift mechanism.

[0139] [Summary of the present disclosure] Hereinafter, a summary of the present disclosure will be appended.

[0140] (Appendix 1) A light source, A light modulation element that forms a projection image with modulated light obtained by modulating the emitted light emitted from the light source, A first relay optical system that forms an intermediate image of the projection image at a first position, An enlargement optical system that includes an enlargement side and a reduction side and projects an enlarged image obtained by enlarging the intermediate image of the projection image located on the reduction side onto the enlargement side, A detaching mechanism that enables the enlargement optical system to be detachably attached to the first relay optical system, An imaging element that receives an imaging image formed by the imaging light that has entered from the enlargement side of the enlargement optical system and exits from the reduction side, having, A projector characterized in that the reduction side of the enlargement optical system is telecentric.

[0141] As a result, the projector can replace the magnifying optical system according to the projection specifications. Further, since the reducing side of the magnifying optical system is telecentric, even when the reducing-side imaging surface of the magnifying optical system is displaced in the optical axis direction from the first position when the magnifying optical system is attached to the first relay optical system, the magnifying optical system can project the intermediate image of the projected image well onto the magnifying side.

[0142] (Appendix 2) Both sides of the first relay optical system are telecentric, The projector according to Appendix 1, characterized in that the side of the imaging element of the first optical system that forms an image of the imaging light on the imaging element is telecentric.

[0143] As a result, even when the light modulation element is displaced in the optical axis direction, an intermediate image of the projected image with no magnification change can be formed at the first position. Further, even when the imaging element is displaced in the optical axis direction, an imaging image with no magnification change can be formed on the imaging element.

[0144] (Appendix 3) The first relay optical system forms an intermediate image of the projected image that is the same magnification as the projected image at the first position, The projector according to Appendix 1 or 2, characterized in that the projected image and the imaging image are the same size.

[0145] As a result, it is possible to satisfactorily suppress aberrations generated in the common part of the optical system of the projection optical system for projecting the projected image and the imaging optical system for forming the imaging image in the optical system.

[0146] (Appendix 4) A light deflection element that guides the imaging light from the magnifying optical system to the imaging element and guides the modulated light from the light modulation element to the magnifying optical system, A second relay optical system that forms an intermediate image of the imaging image at the first position, and further has The imaging light passes through the magnifying optical system, the first position, the light deflection element, the second relay optical system, and the imaging element in this order, for the projector according to any one of Appendices 1 to 3.

[0147] As a result, the first relay optical system as the projection optical system and the second relay optical system as the imaging optical system are separated, so that optical characteristics corresponding to each optical system can be obtained. Further, since the light deflection element is located at a position close to the first position where the intermediate image is formed, the spread of the light beam passing through the light deflection element is small. Thereby, the size of the light deflection element can be made compact.

[0148] (Appendix 5) It further has a light deflection element that guides the imaging light from the magnifying optical system to the imaging element and guides the modulated light from the light modulation element to the magnifying optical system. The imaging light passes through the magnifying optical system, the light deflection element, and the imaging element in this order, for the projector according to any one of Appendices 1 to 3.

[0149] As a result, the imaging light from the magnifying optical system reaches the imaging element only by passing through the light deflection element, so that the imaging image formed on the imaging element has high image quality and the amount of imaging light reaching the imaging element can be ensured.

[0150] (Appendix 6) It further has a light deflection element that guides the imaging light from the magnifying optical system to the imaging element and guides the modulated light from the light modulation element to the magnifying optical system. The imaging light passes through the magnifying optical system, the first position, the first relay optical system, the light deflection element, and the imaging element in this order. The modulated light passes through the light modulation element, the light deflection element, the first relay optical system, the first position, and the magnifying optical system in this order, for the projector according to any one of Appendices 1 to 3.

[0151] As a result, since the imaging element and the light modulation element are arranged near the light deflection element, even when the shape of the light deflection element changes due to a temperature change, the optical characteristics with respect to the imaging element and the light modulation element are less likely to change.

[0152] (Appendix 7) The first relay optical system is characterized in that an intermediate image of the imaging image is formed at a first position. The projector according to Appendix 6.

[0153] As a result, since the intermediate image of the imaging image and the intermediate image of the projection image can be formed by one optical system, the entire optical system can be made compact.

[0154] (Appendix 8) The first relay optical system includes a first reflecting surface having a concave shape, and the projector according to any one of Appendices 1 to 7.

[0155] As a result, by folding the optical path of the first relay optical system 5, the entire first relay optical system can be made compact. Further, since the optical path of the first relay optical system is folded by the first reflecting surface, chromatic aberration generated by folding the optical path can be suppressed.

[0156] (Appendix 9) The first relay optical system includes a first reflecting member having a first transmitting surface with negative power and the first reflecting surface with positive power, and the projector according to Appendix 8.

[0157] As a result, it becomes easy to control the spread of light reflected by the first reflecting surface. Further, compared with the case where the first transmitting surface and the first reflecting surface are separate optical members, the component cost can be suppressed.

[0158] (Appendix 10) The first relay optical system according to appended claim 9 is characterized in that it includes a first dimming member that is adjacent to the first transmission surface on the incident side of the first transmission surface and restricts the amount of light incident on the first reflection member.

[0159] Thereby, the contrast of the intermediate image formed at the first position can be improved.

[0160] (Appended claim 11) The first relay optical system includes, in the order in which the modulated light passes from the light modulation element toward the first position, a first lens group, the first reflection member, and a second lens group. The first lens group has positive power. The second lens group has positive power. The modulated light emitted from the light modulation element passes through the first lens group and reaches the first reflection member. The modulated light emitted from the first lens group passes through the first transmission surface and is reflected by the first reflection surface. The modulated light reflected by the first reflection surface passes through the first transmission surface and reaches the second lens group. The modulated light emitted from the reflection member passes through the second lens group and is imaged as the intermediate image of the projection image at the first position. The projection image and the intermediate image of the projection image are each rectangular images having a first side facing in a first direction and a second side facing in a second direction orthogonal to the first direction. The center line parallel to the first side of the projection image does not overlap with the center line parallel to the first side of the intermediate image of the projection image. The projector according to appended claim 9 or 10, wherein the center line parallel to the second side of the projection image does not overlap with the center line parallel to the second side of the intermediate image of the projection image.

[0161] Thus, even when the lens powers of the first lens group and the second lens group are increased to shorten the overall length of the first relay optical system, various aberrations generated in the first lens group and the second lens group can be suppressed by the power of the concave shape of the first transmission surface. In addition, since the positions of the optical members disposed between the light modulation element and the lens member can be arranged to be displaced from each other in the first direction and the second direction, the degree of freedom in the layout of the optical members can be increased.

[0162] (Appendix 12) The projector according to Appendix 4, wherein the second relay optical system includes a second reflecting surface having a concave shape.

[0163] Thus, by folding the optical path of the second relay optical system, the entire second relay optical system can be made compact. In addition, since the optical path of the second relay optical system is folded by the second reflecting surface, chromatic aberration generated by folding the optical path can be suppressed.

[0164] (Appendix 13) The projector according to Appendix 12, wherein the second relay optical system includes a second reflecting member including a second transmission surface having a negative power and the second reflecting surface having a positive power.

[0165] Thus, it becomes easy to control the spread of light reflected by the second reflecting surface. In addition, compared with the case where the second transmission surface and the second reflecting surface are separate optical members, the component cost can be suppressed. Further, if the second reflecting member and the first reflecting member are common components, the component cost can be reduced.

[0166] (Appendix 14) The projector according to Appendix 13, wherein the second relay optical system includes a second light control member that is adjacent to the second transmission surface on the incident side of the second transmission surface and limits the amount of light incident on the second reflecting member.

[0167] This enables the light rays incident on the imaging device to be evenly restricted, thus optimizing the dynamic range of the imaging image formed on the imaging device.

[0168] (Appendix 15) The projector according to Appendix 14, wherein the F number of the second relay optical system is larger than the F number of the first relay optical system.

[0169] This can improve the contrast of the imaging image formed on the imaging device and brighten the enlarged image projected on the enlarged side. Also, since the second relay optical system has a smaller light spread angle than the first relay optical system, the second relay optical system can be miniaturized.

[0170] (Appendix 16) The projector according to any one of Appendices 4 to 7, wherein the light deflection element includes a wavelength separation film.

[0171] This enables the light deflection element to vary the optical paths of the imaging light emitted from the magnifying optical system and the modulated light incident on the magnifying optical system according to the wavelength band of the light. Also, when the imaging light is infrared light, and the modulated light is visible light, the imaging light is not affected by stray light and ghost light of the modulated light generated in the magnifying optical system, so the imaging device can receive a clear imaging image.

[0172] (Appendix 17) The projector according to any one of Appendices 4 to 7, wherein the light deflection element includes a polarization separation film.

[0173] This enables the light deflection element to vary the optical paths of the imaging light emitted from the magnifying optical system and the modulated light incident on the magnifying optical system according to the polarization component of the light. Also, since the modulated light emitted from the light modulation element has a uniform polarization component, imaging of the imaging image and projection of the projection image can be realized while maintaining the light amount of the modulated light.

Explanation of Reference Numerals

[0174] 1... Projector, 1A... Projector, 1B... Projector, 2... Light source device, 3·3R·3G... Light modulation element, 3B... Light modulation element, 4·4A·4B... Optical system, 5·5A·5B... First relay optical system, 6... Second relay optical system, 7... Magnifying optical system, 8... Image sensor, 9... Light deflection element, 10... Control unit, 11... Detachable mechanism, 13... Phase difference plate, 14... Prism block, 15... Intermediate image, 16... Intermediate image, 18... Projected image, 19... Formed image, 20... Illumination optical system, 21... Light source, 22... First integrator lens, 23... Second integrator lens, 24... Polarization conversion element, 25... Superposition lens, 30... Separation optical system, 31... Dichroic mirror, 32... Reflective mirror, 33R... Field lens, 33G... Field lens, 33B... Field lens, 34... Dichroic mirror, 35... Relay lens, 36... Reflective mirror, 37... Relay lens, 38... Reflective mirror, 41... Projection optical system, 42... Imaging optical system, 50... Dichroic prism, 51... Lens member, 51a... First lens element, 51b... Second lens element, 52... First reflective member, 52a... First transmission surface, 52b... First reflective surface, 54... First light control member, 56... First side, 57... Second side, 61... Lens member, 62... Second reflective member, 61a... First lens element, 61b... Second lens element, 62a... Second transmission surface, 62b... Second reflective surface, 64... Second light control member, 65... Prism, 70... Projection lens, 71... Prism, 91... Polarization separation film, 95... Wavelength separation film, 511... First lens, 512... Polarization combining and separating prism, 512a... Polarization separation film, 513... Second lens, 514... Phase difference plate, 515... First reflective member, 515a... First reflective surface, 516... Third lens, 517... Fourth lens, 518... Bonded lens, 521... First lens, 522... Second lens, 523... Polarization combining and separating prism, 523a... Polarization separation film, 524... Third lens, 525... Phase difference plate, 526... First reflective member, 526a... First reflective surface, 527... Fourth lens, 528... Fifth lens, L1~L14... Lenses, L21... First bonded lens, L22... Second bonded lens, L23... Third bonded lens, LA... Modulated light, LB... Imaging light, S... Screen, S1... First position.

Claims

1. A light source, a light modulation element that forms a projected image with modulated light obtained by modulating the emitted light emitted from the light source, a first relay optical system that forms an intermediate image of the projected image at a first position, an enlargement optical system that includes an enlargement side and a reduction side, and projects an enlarged image obtained by enlarging the intermediate image of the projected image located on the reduction side to the enlargement side, a detaching mechanism that enables the enlargement optical system to be detachably attached to the first relay optical system, an imaging element that receives an imaging image formed by the imaging light that has entered from the enlargement side of the enlargement optical system and has exited from the reduction side, having, a projector, characterized in that the reduction side of the enlargement optical system is telecentric.

2. Both sides of the first relay optical system are telecentric, The projector according to claim 1, characterized in that the side of the imaging element of the first optical system that forms the imaging light into an image on the imaging element is telecentric.

3. The first relay optical system forms an intermediate image of the projected image that is the same magnification as the projected image at the first position, The projector according to claim 1 or 2, characterized in that the projected image and the imaging image are the same size.

4. a light deflection element that guides the imaging light from the enlargement optical system to the imaging element and guides the modulated light from the light modulation element to the enlargement optical system, a second relay optical system that forms an intermediate image of the imaging image at the first position, further having, The projector according to claim 1, characterized in that the imaging light passes through the enlargement optical system, the first position, the light deflection element, the second relay optical system, and the imaging element in this order.

5. further having a light deflection element that guides the imaging light from the enlargement optical system to the imaging element and guides the modulated light from the light modulation element to the enlargement optical system, The projector according to claim 1, characterized in that the imaging light passes through the enlargement optical system, the light deflection element, and the imaging element in this order.

6. further having a light deflection element that guides the imaging light from the enlargement optical system to the imaging element and guides the modulated light from the light modulation element to the enlargement optical system, The imaging light passes through the enlargement optical system, the first position, the first relay optical system, the light deflection element, and the imaging element in this order, The modulated light passes through the optical modulation element, the optical deflection element, the first relay optical system, the first position, and the magnifying optical system in this order, in the projector according to claim 1.

7. The first relay optical system forms an intermediate image of the imaging image at the first position, in the projector according to claim 6.

8. The first relay optical system includes a first reflecting surface having a concave shape, in the projector according to claim 1.

9. The first relay optical system includes a first reflecting member having a first transmission surface with negative power and the first reflecting surface with positive power, in the projector according to claim 8.

10. The first relay optical system includes a first light control member that is adjacent to the first transmission surface on the incident side of the first transmission surface and limits the amount of light incident on the first reflecting member, in the projector according to claim 9.

11. The first relay optical system includes, in the order in which the modulated light passes from the optical modulation element toward the first position, a first lens group, the first reflecting member, and a second lens group, the first lens group has positive power, the second lens group has positive power, the modulated light emitted from the optical modulation element passes through the first lens group and reaches the first reflecting member, the modulated light emitted from the first lens group passes through the first transmission surface and is reflected by the first reflecting surface, the modulated light reflected by the first reflecting surface passes through the first transmission surface and reaches the second lens group, the modulated light emitted from the reflecting member passes through the second lens group and is imaged as the intermediate image of the projection image at the first position, the projection image and the intermediate image of the projection image are each rectangular images having a first side facing in a first direction and a second side facing in a second direction orthogonal to the first direction, a center line parallel to the first side of the projection image does not overlap with a center line parallel to the first side of the intermediate image of the projection image, a center line parallel to the second side of the projection image does not overlap with a center line parallel to the second side of the intermediate image of the projection image, in the projector according to claim 9 or 10.

12. The second relay optical system includes a second reflecting surface having a concave shape, in the projector according to claim 4.

13. The projector according to claim 12, wherein the second relay optical system includes a second reflecting member including a second transmission surface having a negative power and the second reflecting surface having a positive power.

14. The projector according to claim 13, wherein the second relay optical system includes a second light control member that is adjacent to the second transmission surface on the incident side of the second transmission surface and restricts the amount of light incident on the second reflecting member.

15. The projector according to claim 14, wherein the F number of the second relay optical system is larger than the F number of the first relay optical system.

16. The projector according to any one of claims 4 to 7, wherein the light deflector includes a wavelength separation film.

17. The projector according to any one of claims 4 to 7, wherein the light deflector includes a polarization separation film.

Images