projector

Abstract

To miniaturize a projector.SOLUTION: A projector includes: a light source that emits first light; a first liquid crystal panel that modulates the first light; a first polarizing plate that transmits first polarized light of the first light; and a first base material that holds the first polarizing plate and has an opening formed in a region opposed to a region where the first light is incident on the first polarizing plate. The first base material has a heat receiving portion that receives heat of the first polarizing plate and a heat radiation portion that radiates the heat received by the heat receiving portion. The first base material is a vapor chamber that vaporizes a liquid refrigerant sealed inside by the heat received in the heat receiving portion and condenses a gas refrigerant into the liquid refrigerant by radiating heat of the gas refrigerant in the heat radiation portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] In a projector, different colored lights emitted from a light source are modulated by a light modulation device according to image information, the generated image lights for each color are combined using a prism or mirror, and the combined image light is projected onto a screen by a projection optical system. The light modulation device includes, for example, a liquid crystal panel, a polarizing plate provided on the incident side of the liquid crystal panel on which the different colored lights are incident, and a polarizing plate provided on the exit side of the liquid crystal panel on which the image lights for each color are emitted. The projector is provided with a cooling mechanism for cooling the light modulation device, which generates a large amount of heat like the light source device when in operation.

[0003] For example, Patent Document 1 discloses a cooling mechanism capable of cooling a polarizing plate provided on the image light emission side of a light modulation device of a projector. The cooling mechanism disclosed in Patent Document 1 includes a reserve tank, a pump, a jacket unit, and a radiator. The polarizing plate provided on the image light emission side is pressed and fixed to a light-transmitting substrate supported by a frame member. The frame member is in contact with a holder member that holds a color synthesis prism that combines multiple colors of image light. The reserve tank, pump, jacket unit, and radiator are internally connected to one another, and a coolant circulates therethrough. By fixing the jacket unit to the holder member, heat generated by the polarizing plate provided on the image light emission side is released in two ways: one that passes sequentially through the color synthesis prism, holder member, and jacket unit, and the other that passes sequentially through the light-transmitting substrate, frame member, holder member, and jacket unit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-217041 Summary of the Invention [Problem to be solved by the invention]

[0005] In the projector disclosed in the above-mentioned Patent Document 1, the cooling mechanism for the polarizing plate located on the image light emission side includes a reserve tank to suppress an increase in internal pressure, and multiple pumps to transport the refrigerant, and the cooling mechanism has a large number of parts and is large, which leads to an increase in the size of the entire device. [Means for solving the problem]

[0006] In order to solve the above problems, one aspect of the present invention provides a projector including: a light source that emits a first light; a first liquid crystal panel that modulates the first light; a first polarizing plate that transmits a first polarization of the first light; and a first substrate that holds the first polarizing plate and has a first opening formed in an area facing an area of ​​the first polarizing plate where the first light is incident. The first substrate includes a heat receiving section that receives heat from the first polarizing plate and a heat dissipation section that dissipates the heat received by the heat receiving section. The first substrate is a vapor chamber that vaporizes a liquid refrigerant sealed inside by the heat received by the heat receiving section, and condenses the gaseous refrigerant into a liquid refrigerant by dissipating the heat of the gaseous refrigerant by the heat dissipation section. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a configuration diagram of a projector according to an embodiment of the invention. [Figure 2] 2 is a configuration diagram of a light source device provided in the projector of FIG. 1. FIG. [Figure 3] 2 is a diagram showing the configuration of a cooling mechanism for an exit-side polarizing plate of the projector in FIG. 1. [Figure 4] 4 is a diagram showing the configuration of a first modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 5] 4 is a diagram showing the configuration of a second modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 6] 4 is a diagram showing the configuration of a second modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 7]4 is a diagram showing the configuration of a second modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 8] 4 is a diagram showing the configuration of a second modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 9] 4 is a diagram showing the configuration of a third modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 10] 4 is a diagram showing the configuration of a third modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 11] 4 is a diagram showing the configuration of a third modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 12] 3. FIG. 9 is a diagram showing the configuration of a fourth modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 13] 3. FIG. 9 is a diagram showing the configuration of a fourth modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 14] 3. FIG. 9 is a diagram showing the configuration of a fourth modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 15] 3. FIG. 9 is a diagram showing the configuration of a fifth modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 16] 3. FIG. 9 is a diagram showing the configuration of a fifth modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 17] 3. FIG. 10 is a diagram showing the configuration of a sixth modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 18] 3. FIG. 10 is a diagram showing the configuration of a sixth modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 19] 3. FIG. 10 is a diagram showing the configuration of a sixth modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 20] 3. FIG. 10 is a diagram showing the configuration of a sixth modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 21] 3. FIG. 10 is a diagram showing the configuration of a sixth modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 22] 3. FIG. 10 is a diagram showing the configuration of a sixth modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 23] 3. FIG. 10 is a diagram showing the configuration of a sixth modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 24]3. FIG. 10 is a diagram showing the configuration of a sixth modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 25] 3. FIG. 10 is a diagram showing the configuration of a seventh modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 26] 3. FIG. 10 is a diagram showing the configuration of a seventh modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 27] 10 is a diagram showing the configuration of another modified example of the cooling mechanism for the exit-side polarizing plate shown in FIG. [Figure 28] FIG. 1 is a schematic diagram showing the configuration of a projector equipped with one liquid crystal panel and an exit-side polarizing plate. [Figure 29] FIG. 1 is a schematic diagram showing the configuration of a projector equipped with one liquid crystal panel and an exit-side polarizing plate. [Figure 30] 4 is a schematic diagram of a main part of a cooling mechanism for the exit-side polarizing plate shown in FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 is a schematic diagram showing the configuration of a projector 1 according to an embodiment of the present invention. The projector 1 is an image display device that uses a liquid crystal panel as a light modulation device. Note that in the drawings referred to below, the scale of the dimensions of some components may be changed to make them easier to see.

[0009] (projector) 1, projector 1 includes a light source device 2, a color separation optical system 3, field lenses 10R, 10G, and 10B, incident-side polarizing plates 11RA, 11GA, and 11BA, liquid crystal panels 4R, 4G, and 4B, exit-side polarizing plates 11RB, 11GB, and 11BB, a cross dichroic prism 5, and a projection optical system 12. Light source device 2 emits white light LW along an optical axis AX1 toward color separation optical system 3. The configuration of light source device 2 will be described later.

[0010] The color separation optical system 3 separates the white light LW emitted from the light source device 2 into red light LR, green light LG, and blue light LB. The color separation optical system 3 includes a first dichroic mirror 9DA, a second dichroic mirror 9DB, a first total reflection mirror 6RA, a second total reflection mirror 6RB, a third total reflection mirror 6RC, a first relay lens 8LA, and a second relay lens 8LB.

[0011] The first dichroic mirror 9DA separates the white light LW emitted from the light source device 2 into red light LR and light containing green light LG and blue light LB. The first dichroic mirror 9DA transmits the red light LR and reflects the light containing green light LG and blue light LB. The second dichroic mirror 9DB reflects the green light LG and transmits the blue light LB. The second dichroic mirror 9DB separates the light incident from the first dichroic mirror 9DA into green light LG and blue light LB.

[0012] The first total reflection mirror 6RA is arranged in the optical path of the red light LR that has passed through the first dichroic mirror 9DA, and reflects the incident red light LR toward the liquid crystal panel 4R. The second total reflection mirror 6RB and the third total reflection mirror 6RC are arranged in the optical path of the blue light LB that has passed through the second dichroic mirror 9DB, and guide the incident blue light LB to the liquid crystal panel 4B. The green light LG is reflected from the second dichroic mirror 9DB toward the liquid crystal panel 4G.

[0013] The first relay lens 8LA is disposed at least in a region on the incident side of the second total reflection mirror 6RB in the optical path of the blue light LB, and is disposed in a region on the optical path of the blue light LB between the second dichroic mirror 9DB and the second total reflection mirror 6RB. The second relay lens 8LB is disposed at least in a region on the exit side of the second total reflection mirror 6RB in the optical path of the blue light LB, and is disposed in a region on the optical path of the blue light LB between the second total reflection mirror 6RB and the third total reflection mirror 6RC. The first relay lens 8LA and the second relay lens 8LB compensate for optical loss of the blue light LB caused by the optical path length of the blue light LB from the second dichroic mirror 9DB to the liquid crystal panel 4B being longer than the optical path lengths of the red light LR and the green light LG from the second dichroic mirror 9DB to the liquid crystal panel 4R and the liquid crystal panel 4G.

[0014] The liquid crystal panel 4R modulates the red light LR according to the image information to form red image light IR corresponding to the red light LR. The liquid crystal panel 4G modulates the green light LG according to the image information to form green image light IG corresponding to the green light LG. The liquid crystal panel 4B modulates the blue light LB according to the image information to form blue image light IB corresponding to the blue light LB.

[0015] Field lens 10R is disposed in the optical path of red light LR incident on at least liquid crystal panel 4R, and is disposed in the optical path of red light LR between first total reflection mirror 6RA and liquid crystal panel 4R. Field lens 10R collimates the red light LR incident on liquid crystal panel 4R. Field lens 10G is disposed in the optical path of green light LG incident on at least liquid crystal panel 4G, and is disposed in the optical path of green light LG between second dichroic mirror 9DB and liquid crystal panel 4G. Field lens 10G collimates the green light LG incident on liquid crystal panel 4G. Field lens 10B is disposed in the optical path of blue light LB incident on at least liquid crystal panel 4B, and is disposed in the optical path of blue light LB between third total reflection mirror 6RC and liquid crystal panel 4B. Field lens 10B collimates the blue light LB incident on liquid crystal panel 4B.

[0016] The incident-side polarizing plate 11RA is disposed at least in the optical path of the red light LR incident on the liquid crystal panel 4R, and is disposed in the optical path of the red light LR between the field lens 10R and the liquid crystal panel 4R. The incident-side polarizing plate 11RA transmits the red light LR collimated by the field lens 10R, polarized according to the polarization characteristics of the liquid crystal panel 4R. The incident-side polarizing plate 11GA is disposed at least in the optical path of the green light LG incident on the liquid crystal panel 4G, and is disposed in the optical path of the green light LG between the field lens 10G and the liquid crystal panel 4G. The incident-side polarizing plate 11GA transmits the green light LG collimated by the field lens 10G, polarized according to the polarization characteristics of the liquid crystal panel 4G. The incident-side polarizing plate 11BA is disposed at least in the optical path of the blue light LB incident on the liquid crystal panel 4B, and is disposed in the optical path of the blue light LB between the field lens 10B and the liquid crystal panel 4B. The incident-side polarizing plate 11BA transmits the blue light LB collimated by the field lens 10B, polarized according to the polarization characteristics of the liquid crystal panel 4B.

[0017] The exit-side polarizing plate 11RB is disposed in the optical path of at least the image light IR, and is disposed in the optical path of the image light IR between the liquid crystal panel 4R and the cross dichroic prism 5. The exit-side polarizing plate 11RB transmits a predetermined polarization of the image light IR output from the liquid crystal panel 4B. The exit-side polarizing plate 11GB is disposed in the optical path of at least the image light IG, and is disposed in the optical path of the image light IG between the liquid crystal panel 4G and the cross dichroic prism 5. The exit-side polarizing plate 11GB transmits a predetermined polarization of the image light IG output from the liquid crystal panel 4G. The exit-side polarizing plate 11BB is disposed in the optical path of at least the image light IB, and is disposed in the optical path of the image light IB between the liquid crystal panel 4B and the cross dichroic prism 5. The exit-side polarizing plate 11BB transmits a predetermined polarization of the image light IB output from the liquid crystal panel 4B. The predetermined polarization is, for example, P polarization or S polarization. Furthermore, the polarized light components (first polarized light, second polarized light, third polarized light) transmitted through each of the polarizing plates 11BB, 11GB, 11RB can be set appropriately, and are not necessarily different polarized light components.

[0018] Image light IR emitted from liquid crystal panel 4R, image light IG emitted from liquid crystal panel 4G, and image light IB emitted from liquid crystal panel 4B are incident on the cross dichroic prism 5 from different directions. The cross dichroic prism 5 combines the image light IR, IG, and IB, and emits the combined image light IM toward the projection optical system 12.

[0019] The projection optical system 12 is composed of multiple projection lenses (not shown). The projection optical system 12 enlarges and projects the image light IM emitted from the cross dichroic prism 5 onto the screen SCR. The enlarged image is displayed on the screen SCR.

[0020] (Light source device) Next, we will explain the configuration of the light source device 2. Fig. 2 is a schematic diagram showing the configuration of the light source device 2. As shown in Fig. 2, the light source device 2 includes a first light source 41, a dichroic mirror 42, a collimating condensing optical system 43, a wavelength conversion device 20, a second light source 44, a condensing optical system 45, a diffuser plate 46, and a collimating optical system 47.

[0021] The first light source 41 outputs blue light B1 as excitation light E. The first light source 41 includes a substrate 91 and at least one light-emitting element 92. The number of light-emitting elements 92 in the first light source 41 is determined appropriately depending on the ratio between the light intensity required for the blue light B1 emitted from the first light source 41 and the light intensity of the blue light B1 emitted by a single light-emitting element 92. When the first light source 41 includes multiple light-emitting elements 92, the multiple light-emitting elements 92 are arranged in an array or matrix on the surface 91a of the substrate 91. The light-emitting element 92 is, for example, a semiconductor laser (laser diode; LD) that emits blue light B1. The blue light B1 has a wavelength band that includes at least the excitation wavelength of a phosphor 23, which will be described later.

[0022] The dichroic mirror 42 is disposed in the optical path of the blue light B1 between the first light source 41 and the collimating condensing optical system 43. The plate surface of the dichroic mirror 42 is disposed in a direction intersecting the optical axes AX2 and AX4 of the first light source 41 at an angle of 45°. The optical axis AX4 extends in a straight line with the optical axis AX1. The dichroic mirror 42 reflects the incident blue light and transmits the incident red and green light. Therefore, the dichroic mirror 42 reflects the excitation light E and the blue light B2 (described later) and transmits the yellow light Y (described later).

[0023] The collimating condensing optical system 43 condenses the blue light B1 reflected by the dichroic mirror 42, causes it to enter the wavelength conversion device 20, and collimates the yellow light Y emitted from the wavelength conversion device 20. The collimating condensing optical system 43 includes a first lens 43LA and a second lens 43LB. Each of the first lens 43LA and the second lens 43LB is, for example, a convex lens.

[0024] The wavelength conversion device 20 includes a phosphor wheel 21 and a motor 25. The phosphor wheel 21 includes a wheel substrate 22, a phosphor 23, a reflecting member 26, and a heat dissipation member 24. The motor 25 has a rotation support member 27 that is rotatable about a central axis OX. The phosphor wheel 21 is fixed to the motor 25 via the rotation support member 27, and thereby rotates about the central axis OX in a direction parallel to a plane perpendicular to the optical axis AX4.

[0025] The wheel substrate 22 has a front surface 22a and a back surface 22b opposite to the front surface 22a. The wheel substrate 22 is formed in an annular shape and is made of a material with excellent heat dissipation and reflectivity, such as aluminum or copper.

[0026] The phosphor 23 is disposed on the surface 22a of the wheel substrate 22 and is formed in a circular ring shape centered on the central axis OX. The phosphor 23 is excited by blue light B1, which is excitation light E incident from the surface 23a, and emits yellow light Y containing red light and green light as fluorescence from the surface 23a. The phosphor 23 is made of, for example, Y3Al5O 12It is composed of YAG:Ce, which is a garnet crystal (YAG) doped with cerium ions. Cerium ions are, for example, Ce 3+ The phosphor 23 may contain an appropriate scattering element (not shown).

[0027] The reflecting member 26 is provided between the rear surface 23b of the phosphor 23 and the front surface 22a of the wheel substrate 22. The reflecting member 26 reflects light emitted from the rear surface 23b of the phosphor 23 toward the front surface 23a.

[0028] The heat dissipation member 24 is provided on the rear surface 22b of the wheel substrate 22. The wavelength conversion device 20 emits yellow light Y, which is fluorescent light, by irradiating excitation light E from the first light source 41 onto the surface 23a of the phosphor 23, which is rotating due to the operation of the motor 25. The heat generated by the phosphor 23 as it emits the yellow light Y is transferred to the heat dissipation member 24 via the wheel substrate 22 and then dissipated. The wavelength conversion device 20 rotates the phosphor wheel 21 to change the incident position of the blue light B1 in the circumferential direction around the central axis OX, thereby suppressing a temperature rise in the phosphor 23, efficiently cooling the phosphor 23 via the heat dissipation member 24, and suppressing a decrease in fluorescence conversion efficiency associated with a temperature rise in the phosphor 23. This allows the wavelength conversion device 20 to generate bright yellow light Y.

[0029] The second light source 44 outputs blue light B2 along an optical axis AX3. The optical axis AX3 extends in a straight line with the optical axis AX2. The second light source 44 includes a substrate 95 and at least one light-emitting element 96. The number of light-emitting elements 96 in the second light source 44 is determined appropriately depending on the ratio between the light intensity required for the blue light B2 emitted from the second light source 44 and the light intensity of the blue light B2 emitted by a single light-emitting element 96. When the second light source 44 includes multiple light-emitting elements 96, the multiple light-emitting elements 96 are arranged in an array or matrix on the surface 95a of the substrate 95. The light-emitting element 96 is, for example, an LD that emits blue light B2. The blue light B1 has the same wavelength band as the blue light B emitted to the color separation optical system 3.

[0030] The focusing optical system 45 includes a first lens 45LA and a second lens 45LB. The focusing optical system 45 focuses the blue light B2 emitted from the second light source 44 on or near the diffusion surface of the diffuser plate 46. Each of the first lens 45LA and the second lens 45LB is, for example, a convex lens. The diffuser plate 46 diffuses the blue light B2 emitted from the second light source 44 to generate blue light B2 having a light distribution similar to that of the yellow light Y emitted from the wavelength conversion device 20. The diffuser plate 46 is, for example, frosted glass made of optical glass.

[0031] The collimating optical system 47 includes a first lens 47LA and a second lens 47LB. The collimating optical system 47 collimates the light emitted from the diffuser plate 46. The first lens 47LA and the second lens 47LB are each a convex lens. The blue light B2 emitted from the second light source 44 is reflected by the dichroic mirror 42 and combined with the yellow light Y emitted from the wavelength conversion device 20 and transmitted through the dichroic mirror 42 to generate white light LW. The white light LW enters the uniform illumination optical system 80.

[0032] The uniform illumination optical system 80 includes a first lens array 81, a second lens array 82, a polarization conversion element 83, and a superimposing lens 84. The first lens array 81 has a plurality of first lenses 81LA for dividing the white light LW emitted from the light source device 2 into a plurality of partial light beams. The plurality of first lenses 81LA are arranged in a matrix in a plane perpendicular to the optical axis AX1.

[0033] The second lens array 82 has a plurality of second lenses 82LA corresponding to the plurality of first lenses 81LA of the first lens array 81. The plurality of second lenses 82LA are arranged in a matrix in a plane perpendicular to the optical axis AX1. The second lens array 82 cooperates with the superimposing lens 84 to form an image of each of the first lenses 81LA of the first lens array 81 in the image forming area of ​​each of the liquid crystal panels 4R, 4G, and 4B.

[0034] The polarization conversion element 83 converts the light emitted from the second lens array 82 into linearly polarized light. The polarization conversion element 83 has, for example, a polarization separation film and a phase difference plate (not shown). The superimposing lens 84 collects each partial light beam emitted from the polarization conversion element 83 and superimposes them on the image forming areas of each of the liquid crystal panels 4R, 4G, and 4B. The superimposing lens 84 is, for example, a convex lens.

[0035] The light source device 2 is not necessarily limited to the configuration described above as long as it is configured to be able to output white light LW containing blue light LB, green light LG, and red light LR toward the color separation optical system 3.

[0036] (Cooling mechanism for the exit-side polarizer) Next, a cooling mechanism including the exit side polarizers 11RB, 11GB, and 11BB, the liquid crystal panels 4R, 4G, and 4B, and the cross dichroic prism 5 in the projector 1 of the embodiment will be described.

[0037] 3 is a perspective view of the emission-side polarizing plates 11RB, 11GB, and 11BB, the cross dichroic prism 5, and the components in the surrounding areas of these members in the projector 1. As shown in FIG. 3, the emission-side polarizing plate 11RB is held by a holding member 101. The emission-side polarizing plate 11GB is held by a holding member 102. The emission-side polarizing plate 11BB is held by a holding member 103.

[0038] The cross dichroic prism 5 is supported by a support member 271. The support member 271 has a wall portion 272 and a prism support portion 274. The wall portion 272 is disposed in the optical path of the image light IM emitted from the cross dichroic prism 5, and is disposed in the optical path of the image light IM between the cross dichroic prism 5 and the projection optical system 12. The plate surface of the wall portion 272 is disposed parallel to the side surface 5CM from which the image light IM is emitted from the cross dichroic prism 5. When viewed along the optical axis of the image light IM, the plate surface of the wall portion 272 is larger than the side surface 5CM of the cross dichroic prism 5. An opening (not shown) is formed in the wall portion 272 to allow the image light IM to pass through. The opening (not shown) is formed larger than the irradiation area of ​​the image light IM emitted from the cross dichroic prism 5.

[0039] The prism support portion 274 of the support member 271 extends from the wall portion 272 downward toward the bottom surface 5b of the cross dichroic prism 5. The surface 274a of the prism support portion 274 is parallel to and larger than the bottom surface 5b of the cross dichroic prism 5. The surface 274a of the prism support portion 274 may be in contact with the bottom surface 5b of the cross dichroic prism 5, or may face the bottom surface 5b via a support member (not shown).

[0040] The holding member 101 is a vapor chamber 251. The holding member 101 has a polarizing plate support portion 111, a heat receiving portion 121, a connection portion 125, and a heat dissipation portion 131. The polarizing plate support portion 111 is in contact with the output-side polarizing plate 11RB and is disposed in a region on the input side of the output-side polarizing plate 11RB on which the image light IR is incident. The polarizing plate support portion 111 has an opening 112 formed therein for passing the image light IR output from the liquid crystal panel 4R. That is, the polarizing plate support portion 111 is formed in a frame shape so as to surround the region SR through which the image light IR passes.

[0041] The heat receiving portion 121 receives heat from the exit-side polarizing plate 11RB. The heat receiving portion 121 is configured as a frame-shaped region of the polarizing plate support portion 111 that overlaps with the exit-side polarizing plate 11RB when viewed along the optical axis of the image light IR passing through the opening 112. A plate surface 101p of the heat receiving portion 121 of the holding member 101 that faces the exit-side polarizing plate 11RB and the cross dichroic prism 5 abuts against a plate surface 11Rq on the outer periphery of the region SR on the incident side of the image light IR of the exit-side polarizing plate 11RB, or is in contact with this plate surface via an adhesive (not shown). When viewed along the incident direction of the image light IR, the outer edge 11Rr of the exit-side polarizing plate 11RB does not overlap with the edge of the opening 112 and is located outside the opening 112. The connecting portion 125 extends from the upper end of the heat receiving portion 121 parallel to the side surface 5CR of the cross dichroic prism 5 on which the image light IR is incident, above the surface 5a of the cross dichroic prism 5, and bends above the surface 5a toward the space above the surface 5a. The plate surface 11Rp of the exit-side polarizing plate 11RB facing the cross dichroic prism 5 is spaced apart from the side surface 5CR of the cross dichroic prism 5 and is spaced apart from the side surface 5CR.

[0042] The heat dissipation section 131 extends from an end of the connection section 125 opposite to the end connected to the polarizing plate support section 111 and located above the surface 5a of the cross dichroic prism 5 toward the side surface 5CB of the cross dichroic prism 5 on which the image light IB is incident. A plate surface 101p and a plate surface 101q opposite to the plate surface 101p of the holding member 101 that constitutes the heat dissipation section 131 are parallel to the surface 5a of the cross dichroic prism 5.

[0043] A support member 200 is provided between the surface 5a of the cross dichroic prism 5 and the plate surface 101p of the heat dissipation unit 131 that faces the surface 5a. The support member 200 is formed in a flat plate shape with a plate surface parallel to the surface 5a of the cross dichroic prism 5. When viewed along an imaginary axis perpendicular to the surface 5a of the cross dichroic prism 5, the surface 200a and the bottom surface 200b of the support member 200 are appropriately smaller than the surface 5a. However, when viewed along the imaginary axis perpendicular to the surface 5a, the support member 200 on the side of the side surface 5CM of the cross dichroic prism 5 passes through the side surface 5CM and extends toward the wall portion 272 of the support member 271, and is connected to the wall portion 272.

[0044] The heat dissipation section 131 of the holding member 101 is disposed on the surface 200a of the support member 200. That is, the plate surface 101p of the heat dissipation section 131 facing the surface 5a is in contact with the surface 200a of the support member 200 and is, for example, flush with the surface 200a. The support member 200 is connected to a wall portion 272 of the support member 271 by a fastener (not shown). The cross dichroic prism 5 is disposed between the support member 200 and a prism support portion 274 of the support member 271. The bottom surface 200b of the support member 200 is disposed at a distance from the surface 5a of the cross dichroic prism 5. Therefore, the holding member 101 is supported by the support member 271, which supports the cross dichroic prism 5, via the support member 200.

[0045] A recess 202 is formed in a surface 200a of the support member 200. A heat pipe 210 is connected to the recess 202 of the support member 200. The heat pipe 210 includes a heat receiving section 211, a transport section 212, and a heat dissipation section 213. At least the bottom of the heat receiving section 211 is housed in the recess 202. When viewed along an imaginary axis perpendicular to the surface 5a of the cross dichroic prism 5, the heat receiving section 211 and the recess 202 are at least smaller than the surface 200a of the support member 200, and have a size that is appropriately set in consideration of the cooling effect described below.

[0046] The transport section 212 is formed in a tubular shape. One end of the transport section 212 is connected to a portion of the heat receiving section 211 that is close to the support member 271. The transport section 212 extends from the end connected to the heat receiving section 211 toward the wall section 272 of the support member 271, and then bends upward. The transport section 212 from the end connected to the heat receiving section 211 to the bent point is fitted into a recess formed in an end surface 271c of the wall section 272, and is supported by the wall section 272 of the support member 271.

[0047] The other end of the transport section 212, opposite the bridge connected to the heat receiving section 211, is located in the space above the cross dichroic prism 5 and the support member 200. The heat dissipation section 213 is connected to the other end of the transport section 212. The heat dissipation section 213 is formed in a tubular shape, similar to the transport section 212. The heat dissipation section 213 is provided with a heat dissipation member 220 made up of a plurality of heat dissipation plates 222. Specifically, the plurality of heat dissipation plates 222 are arranged at intervals from one another along the axial direction of the heat dissipation section 213, and the heat dissipation section 213 penetrates the plurality of heat dissipation plates 222.

[0048] The plate-shaped portion of the holding member 101, including the plate surface 101p, functions as a heat-receiving plate of the vapor chamber 251. The plate-shaped portion of the holding member 101, including the plate surface 101p, functions as a heat-dissipating plate of the vapor chamber 251. The holding member 101, which is the vapor chamber 251, is a hollow member that is composed of a thermally conductive plate-shaped portion including the plate surface 101p, a thermally conductive plate-shaped portion including the plate surface 101q, and a thermally conductive plate-shaped portion including the side surfaces. A refrigerant COR is sealed inside the holding member 101, i.e., in the hollow 261. When heat is generated in the output-side polarizing plate 11RB due to the image display operation of the projector 1, the heat from the output-side polarizing plate 11RB is transferred to the plate-shaped portion including the plate surface 101p of the heat-receiving unit 121, and the refrigerant COR in the hollow 261 of the heat-receiving unit 121 changes from a liquid to a gas due to the heat transferred to the hollow 261.

[0049] The refrigerant COR that has changed into a gas flows through the heat receiving section 121, the connection section 125, and the hollow 261 of the holding member 101 of the heat dissipation section 131, and is condensed by dissipating heat in the heat dissipation section 131, and returns to a liquid. The refrigerant COR that has changed back into a liquid flows from the heat dissipation section 131 through the hollow 261 of the holding member 101 of the connection section 125 and returns to the heat receiving section 121. The heat dissipated in the heat dissipation section 131 is received by the heat receiving section 211 of the heat pipe 210, transported by the transport section 212, and dissipated to the heat dissipation member 220 by the heat dissipation section 213, and finally dissipated into space by the heat dissipation member 220. The circulation of the refrigerant COR in the hollow 261 of the holding member 101 and the phase change of the refrigerant COR between a gas and a liquid efficiently cool the output-side polarizing plate 11RB.

[0050] The holding member 102 is a vapor chamber 252. The holding member 102 has a polarizer support portion 141, a heat receiving portion 151, a connection portion 155, and a heat dissipation portion 161. The polarizer support portion 141 contacts the output-side polarizer 11GB and is disposed in an area on the input side of the output-side polarizer 11GB on which the image light IG is incident. The polarizer support portion 141 has an opening 142 formed therein for passing the image light IG output from the liquid crystal panel 4G. That is, the polarizer support portion 141 is formed in a frame shape so as to surround an area SG through which the image light IG passes.

[0051] The heat receiving portion 151 receives heat from the exit-side polarizing plate 11GB. The heat receiving portion 151 is configured as a frame-shaped region of the polarizing plate support portion 141 that overlaps with the exit-side polarizing plate 11GB when viewed along the optical axis of the image light IG passing through the opening 142. A plate surface 102p of the heat receiving portion 151 of the holding member 102 that faces the exit-side polarizing plate 11GB and the cross dichroic prism 5 abuts against a plate surface 11Gq on the outer periphery of the exit-side polarizing plate 11GB, closer to the region SG on the incident side of the image light IG, or is in contact with the plate surface 11Gq via an adhesive (not shown). When viewed along the incident direction of the image light IG, the outer edge 11Gr of the exit-side polarizing plate 11GB does not overlap with the edge of the opening 142 and is located outside the opening 142. The connecting portion 155 extends from the upper end of the polarizing plate support portion 141 parallel to the side surface 5CG of the cross dichroic prism 5 on which the image light IG is incident, above the surface 5a of the cross dichroic prism 5, and bends above the surface 5a toward the space above the surface 5a. The plate surface 11Gp of the exit-side polarizing plate 11GB facing the cross dichroic prism 5 is spaced apart from the side surface 5CG of the cross dichroic prism 5 and is spaced apart from the side surface 5CG.

[0052] The heat dissipation section 161 extends from an end of the connection section 155 opposite to the end connected to the polarizing plate support section 141 and located above the surface 5a of the cross dichroic prism 5, toward a side surface 5CM from which the image light IM emerges in the cross dichroic prism 5. The plate surface 102p and the plate surface 102q opposite to the plate surface 102p of the holding member 102 that constitutes the heat dissipation section 161 are parallel to the surface 5a of the cross dichroic prism 5.

[0053] A recess 204 is formed in a surface 200a of the support member 200 that overlaps with the heat dissipation portion 161 when viewed along an imaginary axis perpendicular to the surface 5a of the cross dichroic prism 5. The depth of the recess 204 is equal to the thickness of the heat dissipation portion 161. The heat dissipation portion 161 is housed in the recess 204. The plate surface 102q of the heat dissipation portion 161, i.e., the plate surface 102q of the holding member 102 that constitutes the heat dissipation portion 161 and is opposite to the plate surface 102p that faces the surface 5a of the cross dichroic prism 5, is flush with the surface 200a of the support member 200. A portion of the plate surface 102q that constitutes the heat dissipation portion 161 of the holding member 102 is in contact with the plate surface 101p of the heat dissipation portion 131 of the holding member 101, i.e., the plate surface 101p that faces the surface 5a of the cross dichroic prism 5 in the heat dissipation portion 131. Therefore, the holding member 102 is supported by a support member 271 that supports the cross dichroic prism 5 via the support member 200 .

[0054] The plate-shaped portion of the holding member 102, including the plate surface 102p, functions as a heat-receiving plate for the vapor chamber 252. The plate-shaped portion of the holding member 102, including the plate surface 102p, functions as a heat-dissipating plate for the vapor chamber 252. The holding member 102, which is the vapor chamber 252, is a hollow member that includes a thermally conductive plate-shaped portion including the plate surface 102p, a thermally conductive plate-shaped portion including the plate surface 102q, and a thermally conductive plate-shaped portion including the side surfaces. A refrigerant COG is sealed inside the holding member 102, i.e., in the hollow 262. When heat is generated in the output-side polarizing plate 11GB due to the image display operation of the projector 1, the heat from the output-side polarizing plate 11GB is transferred to the plate-shaped portion including the plate surface 102p of the heat-receiving unit 151, and the refrigerant COG in the hollow 262 of the heat-receiving unit 151 changes from a liquid to a gas due to the heat transferred to the hollow 262.

[0055] The refrigerant COG that has changed into a gas flows through the heat receiving section 151, the connection section 155, and the hollow 262 of the holding member 102 of the heat dissipation section 161, and is condensed by dissipating heat in the heat dissipation section 161, and returns to a liquid. The refrigerant COG that has changed back into a liquid flows from the heat dissipation section 161 through the hollow 262 of the holding member 102 of the connection section 155, and returns to the heat receiving section 151. The heat dissipated in the heat dissipation section 161 is received by the heat receiving section 211 of the heat pipe 210, transported by the transport section 212, and dissipated to the heat dissipation member 220 by the heat dissipation section 213, and finally dissipated into space by the heat dissipation member 220. The output-side polarizing plate 11GB is cooled by the circulation of the refrigerant COG in the hollow 262 of the holding member 102 and the phase change of the refrigerant COG between gas and liquid.

[0056] The holding member 103 has a polarizing plate support portion 171, a heat receiving portion 181, a connection portion 185, and a heat dissipation portion 191. The polarizing plate support portion 171 is in contact with the exit-side polarizing plate 11BB and is arranged in an area on the incident side of the image light IB with respect to the exit-side polarizing plate 11BB. An opening 172 is formed in the polarizing plate support portion 171 to allow the image light IB emitted from the liquid crystal panel 4B to pass through. In other words, the polarizing plate support portion 171 is formed in a frame shape so as to surround an area SB through which the image light IB passes.

[0057] The heat receiving portion 181 receives heat from the exit-side polarizing plate 11BB. The heat receiving portion 181 is configured as a frame-shaped region of the polarizing plate support portion 171 that overlaps with the exit-side polarizing plate 11BB when viewed along the optical axis of the image light IB passing through the opening 172. A plate surface 103p of the heat receiving portion 181 of the holding member 103, which faces the exit-side polarizing plate 11BB and the cross dichroic prism 5, abuts against a plate surface 11Bq on the outer periphery of the exit-side polarizing plate 11BB, which is closer to the region SB on the incident side of the image light IB, or is in contact with the plate surface 11Bq via an adhesive (not shown). When viewed along the incident direction of the image light IB, the outer edge 11Br of the exit-side polarizing plate 11BB does not overlap with the edge of the opening 172 and is located outside the opening 172. The connecting portion 185 extends from the upper end of the heat-receiving portion 181 parallel to the side surface 5CB of the cross dichroic prism 5 on which the image light IB is incident, above the surface 5a of the cross dichroic prism 5, and bends above the surface 5a toward the space above the surface 5a. The plate surface 11Bp of the exit-side polarizing plate 11BB facing the cross dichroic prism 5 is spaced apart from the side surface 5CB of the cross dichroic prism 5 and is spaced apart from the side surface 5CB.

[0058] The heat dissipation portion 191 extends from an end of the connecting portion 185 opposite the end connected to the polarizing plate support portion 171 and located higher than the surface 5a of the cross dichroic prism 5 toward the side surface 5CR of the cross dichroic prism 5. A plate surface 103p and a plate surface 103q opposite to the plate surface 103p of the holding member 103 that constitute the heat dissipation portion 191 are parallel to the surface 5a of the cross dichroic prism 5. The heat dissipation portion 191 of the holding member 103 is disposed at a distance from the heat dissipation portion 131 of the holding member 101 in a plane parallel to the surface 5a of the cross dichroic prism 5. A portion of the bottom surface of the heat dissipation portion 191 of the holding member 103 is parallel to the bottom surface of the heat dissipation portion 131 of the holding member 101 and is in contact with the surface of the heat dissipation portion 161 of the holding member 102. Therefore, the holding member 103 is supported by a support member 271 that supports the cross dichroic prism 5 via the support member 200 .

[0059] The plate-shaped portion of the holding member 103, including the plate surface 103p, functions as a heat-receiving plate for the vapor chamber 253. The plate-shaped portion of the holding member 103, including the plate surface 103p, functions as a heat-dissipating plate for the vapor chamber 253. The holding member 103, which is the vapor chamber 253, is a hollow member that includes a thermally conductive plate-shaped portion including the plate surface 103p, a thermally conductive plate-shaped portion including the plate surface 103q, and a thermally conductive plate-shaped portion including the side surfaces. A refrigerant COB is sealed inside the holding member 103, i.e., in the hollow 263. When heat is generated in the output-side polarizing plate 11BB due to the image display operation of the projector 1, the heat from the output-side polarizing plate 11BB is transferred to the plate-shaped portion including the plate surface 103p of the heat-receiving portion 181, and the refrigerant COB in the hollow 263 of the heat-receiving portion 181 changes from liquid to gas due to the heat transferred to the hollow 263.

[0060] The refrigerant COB that has changed into a gas flows through the heat receiving portion 181, the connection portion 185, and the hollow 263 of the holding member 103 of the heat dissipation portion 191, and is condensed by dissipating heat at the heat dissipation portion 191, and returns to a liquid. The refrigerant COB that has changed back into a liquid flows from the heat dissipation portion 191 through the hollow 263 of the holding member 102 of the connection portion 185, and returns to the heat receiving portion 151. Similarly to the heat dissipated at the heat dissipation portions 131 and 161, the heat dissipated at the heat dissipation portion 191 is received by the heat receiving portion 211 of the heat pipe 210, transported by the transport portion 212, and dissipated to the heat dissipation member 220 at the heat dissipation portion 213, and finally dissipated into space by the heat dissipation member 220. The circulation of the refrigerant COB in the hollow 263 of the holding member 103 and the phase change of the refrigerant COB between a gas and a liquid cool the output-side polarizing plate 11BB.

[0061] The projector 1 described above includes a light source device (light source) 2, a liquid crystal panel (first liquid crystal panel) 4B, an exit-side polarizing plate (first polarizing plate) 11BB, and a holding member (first base material) 103. The light source device 2 reflects blue light B2 emitted from the second light source 44 using a dichroic mirror 42, and emits blue light B as blue light (first light) LB. The liquid crystal panel 4B modulates the blue light LB and emits image light (first light) IB. The exit-side polarizing plate 11BB transmits a predetermined polarized light (first polarization), i.e., P-polarized light or S-polarized light, of the image light IB. The holding member 103 holds the exit-side polarizing plate 11BB. An opening 172 is formed in the holding member 103 in a region SB where the image light IB enters the exit-side polarizing plate 11BB. In the projector 1 having the above-described configuration, the holding member 103 has a heat receiving section 181 that receives heat from the emission-side polarizing plate 11BB, and a heat dissipation section 191 that dissipates the heat received by the heat receiving section 181. The holding member 103 also has a vapor chamber 253 that vaporizes the liquid refrigerant COB sealed in the hollow (inside) 263 by the heat received by the heat receiving section 181, and dissipates the heat of the gaseous refrigerant COB in the heat dissipation section 191, thereby condensing the gaseous refrigerant COB into liquid refrigerant.

[0062] In the above-described projector 1, heat from the emission-side polarizer 11BB is efficiently diffused by thermal conduction in the vapor chamber 253, which is the holding member 103 for the emission-side polarizer 11BB. According to the above-described projector 1, it is not necessary to add any components for transmitting and transporting a refrigerant, heat-receiving components, or heat-dissipating components to the area around the emission-side polarizer 11BB, in addition to the holding member 103 for the emission-side polarizer 11BB. Therefore, it is possible to efficiently cool the emission-side polarizer 11BB, reduce the number of components, and avoid an increase in the size of the cooling mechanism for the emission-side polarizer 11BB and the entire projector 1 device.

[0063] The projector 1 also includes a light source device (light source) 2, a liquid crystal panel (first liquid crystal panel, second liquid crystal panel) 4G, an emission-side polarizing plate (first polarizing plate, second polarizing plate) 11GB, and a holding member (first base material, second base material) 102. The light source device 2 converts the wavelength of blue light B1 emitted from the first light source 41 using a wavelength conversion device 20, and emits yellow light Y containing green light (first light, second light) LG. The liquid crystal panel 4G modulates the green light LG and emits image light (first light, second light) IG. The emission-side polarizing plate 11GB transmits a predetermined polarization (second polarization), i.e., P-polarized light or S-polarized light, of the image light IG. The holding member 102 holds the emission-side polarizing plate 11GB. An opening 142 is formed in the holding member 102 in a region SG where the image light IG enters the emission-side polarizing plate 11GB.

[0064] The holding member 102 has a heat receiving section 151 that receives heat from the emission-side polarizing plate 11GB, and a heat dissipation section 161 that dissipates the heat received by the heat receiving section 151. The holding member 102 also has a vapor chamber 252 that vaporizes the liquid refrigerant COG sealed in a hollow (interior) 262 by the heat received by the heat receiving section 151, and dissipates the heat of the gaseous refrigerant COG in the heat dissipation section 161, thereby condensing the gaseous refrigerant COG into liquid refrigerant. In the above-described projector 1, the heat of the emission-side polarizing plate 11GB is efficiently diffused by thermal conduction in the vapor chamber 252, which is the holding member 102 for the emission-side polarizing plate 11GB.

[0065] The projector 1 also includes a light source device (light source) 2, a liquid crystal panel (first liquid crystal panel, third liquid crystal panel) 4R, an emission-side polarizing plate (first polarizing plate, third polarizing plate) 11RB, and a holding member (first base material, third base material) 101. The light source device 2 converts the wavelength of blue light B1 emitted from the first light source 41 using a wavelength conversion device 20, and emits yellow light Y containing red light (first light, third light) LR. The liquid crystal panel 4R modulates the red light LR and emits image light (first light, third light) IR. The emission-side polarizing plate 11RB transmits a predetermined polarization (third polarization), i.e., P polarization or S polarization, of the image light IR. The holding member 101 holds the emission-side polarizing plate 11RB. An opening 112 is formed in the holding member 101 in a region SR where the image light IR enters the emission-side polarizing plate 11RB.

[0066] The holding member 101 has a heat receiving section 121 that receives heat from the emission-side polarizing plate 11RB, and a heat dissipation section 131 that dissipates the heat received by the heat receiving section 121. The holding member 101 also has a vapor chamber 251 that vaporizes the liquid refrigerant COR sealed in a hollow (interior) 261 by the heat received by the heat receiving section 121, and condenses the gaseous refrigerant COR into liquid refrigerant by dissipating the heat in the heat dissipation section 131. In the above-described projector 1, the heat of the emission-side polarizing plate 11RB is efficiently diffused by thermal conduction in the vapor chamber 251, which is the holding member 101 for the emission-side polarizing plate 11RB.

[0067] According to the above-described projector 1, it is not necessary to add a member for transferring and transporting a refrigerant, a heat receiving member, or a heat dissipation member to the area around the output-side polarizer 11GB, apart from the holding member 102 for the output-side polarizer 11GB. Also, according to the above-described projector 1, it is not necessary to add a member for transferring and transporting a refrigerant, a heat receiving member, or a heat dissipation member to the area around the output-side polarizer 11RB, apart from the holding member 101 for the output-side polarizer 11RB. Therefore, it is possible to efficiently cool each of the output-side polarizers 11BB, 11RB, reduce the number of parts, and avoid an increase in the size of the cooling mechanism for the output-side polarizers 11BB, 11RB and the entire projector 1.

[0068] As described above, the projector 1 includes a light source corresponding to the three primary colors of light, three liquid crystal panels 4R, 4G, and 4B, emission-side polarizing plates 11RB, 11GB, and 11BB, and holding members 101, 102, and 103 that serve as vapor chambers 251, 252, and 253. In the projector 1, heat dissipation destinations from the three emission-side polarizing plates 11RB, 11GB, and 11BB are combined into a common heat pipe 210, which reduces the number of heat dissipation points that need to be cooled compared to when the heat dissipation sections 131, 161, and 191 of the emission-side polarizing plates 11RB, 11GB, and 11BB are individually cooled. Furthermore, the projector 1 reduces the number of components in the cooling mechanism for the three emission-side polarizing plates 11RB, 11GB, and 11BB.

[0069] Furthermore, according to the projector 1, the heat dissipation section 213 and the heat dissipation member 220 can be drawn out to an area above the cross dichroic prism 5 using the heat pipe 210, and can be disposed in an area near an exhaust fan (not shown) or in a location that is easy to cool by air, for example. This makes it possible to improve the cooling efficiency of the projector 1.

[0070] The projector 1 includes a cross dichroic prism (prism) 5 onto which image light (light) IR, IG, IB is incident after passing through exit-side polarizers (first polarizers) 11RB, 11GB, 11BB, and support members 200 and 271 that support the cross dichroic prism 5 and holding members (first base materials) 101, 102, and 103. The support member 200 may indirectly support the cross dichroic prism 5 via a wall portion 272 and a prism support portion 274 of the support member 271. The support members 200 and 271 are connected to a heat dissipation portion 213 of a heat pipe 210 and essentially include the heat dissipation portion 213. According to the projector 1, the support members 200 and 271 can be used as heat dissipation members, which makes it possible to increase the cooling efficiency of the emission-side polarizers 11RB, 11GB, and 11BB, while reducing the number of parts in the cooling mechanism for the emission-side polarizers 11RB, 11GB, and 11BB, and the number of parts in the projector 1. Furthermore, according to the projector 1, the vapor chambers 251, 252, and 253 that hold the emission-side polarizers 11RB, 11GB, and 11BB, and the cross dichroic prism 5 are supported by the common support member 271, which makes it possible to improve optical precision.

[0071] In the projector 1, image light (light modulated by the light modulation device) IR, IG, and IB generated by being modulated by the liquid crystal panels (light modulation devices) 4R, 4G, and 4B is incident on the emission-side polarizers (first polarizers) 11RB, 11GB, and 11BB. In the projector 1, the temperature of the emission-side polarizers 11RB, 11GB, and 11BB increases more easily than that of the incidence-side polarizers 11RA, 11GA, and 11BA, so that efficient cooling can be achieved by using holding members 101, 102, and 103 for the emission-side polarizers 11RB, 11GB, and 11BB.

[0072] Furthermore, in the projector 1, the holding member (first base material) 102 has a connection portion (bent portion) 155 that is bent in the direction in which the support member 200 extends, i.e., in a direction parallel to the surface 5a of the cross dichroic prism 5. The connection portion 155 is in contact with the surface 200a of the support member 200. In the projector 1, heat from the exit-side polarizing plates 11RB, 11GB, and 11BB is dissipated from both the holding members 101, 102, and 103, which are vapor chambers 251, 252, and 253, and the cross dichroic prism 5. In other words, in the projector 1 of this embodiment, the heat from each of the exit-side polarizing plates 11RB, 11GB, and 11BB can be efficiently dissipated from two paths.

[0073] Below, we will explain modified examples of the cooling mechanism for one or more of the emission-side polarizers (first polarizers) 11RB, 11GB, and 11BB in the above-mentioned projector 3. In each modified example, components that are common to the higher-level modified examples are given the same reference numerals as those components, and their description will be omitted. In each modified example, there are cases where only a cooling mechanism for one of the emission-side polarizers 11RB, 11GB, and 11BB is illustrated, but the illustrated cooling mechanism for one emission-side polarizer can be applied to either of the other two emission-side polarizers.

[0074] [First Modification] 4 is a perspective view of the cooling mechanism for the emission-side polarizing plate 11GB of the first modified example of the projector 1. As shown in FIG. 4, the holding member 102 for the emission-side polarizing plate 11GB is a vapor chamber 252, and has a polarizing plate supporting portion 141, a heat receiving portion 151, a connecting portion 155, a coupling portion 156, an extending portion 158, and a heat dissipating portion 161.

[0075] The connecting portion 156 extends from an end of the connecting portion 155 opposite to the end connected to the polarizing plate support portion 141 and located above the surface 5a of the cross dichroic prism 5 toward the side surface 5CM from which the image light IM emerges in the cross dichroic prism 5. The plate surface 102p and the plate surface 102q opposite to the plate surface 102p of the holding member 102 that constitutes the connecting portion 156 are parallel to the surface 5a of the cross dichroic prism 5.

[0076] The recess 204 is formed in the surface 200a of the support member 200, which overlaps with the connecting portion 156 when viewed along an imaginary axis perpendicular to the surface 5a of the cross dichroic prism 5. The depth of the recess 204 is equal to the thickness of the connecting portion 156. The connecting portion 156 is housed in the recess 204. The plate surface 102q of the connecting portion 156, i.e., the plate surface 102q of the holding member 102 that constitutes the connecting portion 156, is flush with the surface 200a of the support member 200. The holding member 102 is connected to the support member 200 by the connecting portion 156, and is supported by the support member 271 via the support member 200.

[0077] The extending portion 158 extends downward from the bottom end of the polarizing plate support portion 141. The heat dissipation portion 161 is connected to the lower end of the extending portion 158. A heat sink 224 made up of a plurality of heat dissipation plates is provided on the plate surface 102q of the heat dissipation portion 161, i.e., on the plate surface 102q of the holding member 102 that constitutes the connecting portion 156. The heat sink 224 may also be provided on the plate surface 102p of the heat dissipation portion 161.

[0078] In the first modified example, when heat is generated in the output-side polarizing plate 11GB due to the image display operation of the projector 1, the heat from the output-side polarizing plate 11GB is transferred to the plate-like portion including the plate surface 102p of the heat receiving portion 151, and the refrigerant COG in the hollow 262 of the heat receiving portion 151 changes from a liquid to a gas due to the heat transferred to the hollow 262. The refrigerant COG that has changed into a gas flows through the heat receiving portion 151, the extension portion 158, and the hollow 262 of the holding member 102 of the heat dissipation portion 161, and is condensed by directly dissipating heat to the heat sink 224 in the heat dissipation portion 161, and returns to a liquid. The refrigerant COG that has returned to a liquid flows from the heat dissipation portion 161 through the hollow 262 of the holding member 102 of the extension portion 158 and returns to the heat receiving portion 151.

[0079] The projector 1 of the first modified example has the same configuration as the projector 1 of the above-described embodiment, and therefore has the same effects as the projector 1 of the above-described embodiment. Furthermore, according to the projector 1 of the first modified example, the heat dissipation section 161 and the heat sink 224, which is a heat dissipation member, can be drawn out to the area below the cross dichroic prism 5 using the extension section 158, and can be disposed in a location where air cooling is easy. This makes it possible to improve the cooling efficiency of the exit-side polarizing plate 11GB.

[0080] Although not shown, in the projector 1 of the first modified example, in addition to the plate surface 102q of the heat dissipation section 161, a heat sink may be provided on the plate surface 102q of the connecting section 155, which is a portion of the connecting section 155 that extends parallel to the side surface 5CG of the cross dichroic prism 5. This can further improve the cooling efficiency of the projector 1.

[0081] [Second Modification] 5 to 8 are side cross-sectional views of a cooling mechanism for the exit-side polarizing plate 11GB of a second modified example of the projector 1. As shown in FIG. 5, the connection portion 155 of the holding member 102 extends upward from the upper end of the polarizing plate holding portion 141 and may not be bent. In this case, the side surface of the support member 200 abuts against the plate surface 102p of the connection portion 155. Also, as shown in FIGS. 5 and 6, the polarizing plate support portion 141 may be disposed in an area on the exit side of the image light IG with respect to the exit-side polarizing plate 11GB. In this case, the polarizing plate support portion 141 is disposed between the exit-side polarizing plate 11GB and the cross dichroic prism 5 (not shown) on the optical axis of the image light IG.

[0082] 7, the connecting portion 155 may extend upward from the upper end of the polarizing plate holding portion 141 without bending, and the support member 200 may abut against the plate surface 102p of the connecting portion 155 and bend downward along the plate surface 102p. Furthermore, as shown in FIG. 8, the connecting portion 155 may extend upward from the upper end of the polarizing plate holding portion 141, bend toward an area above the surface 5a of the cross dichroic prism 5 (not shown), and bend in a state where the support member 200 abuts against the plate surface 102p of the connecting portion 155.

[0083] The projector 1 of the second modified example has a configuration similar to that of the projector 1 of the above-described embodiment, and therefore provides the same effects as those of the projector 1 of the above-described embodiment. Furthermore, according to the projector 1 of the second modified example, compared to the configuration shown in FIG. 5, for example, one of the holding member 102 and the support member 200 is bent toward the plate surface of the other flat member and abuts against the plate surface of the other flat member as shown in FIGS. 6 and 7. This makes it possible to easily increase the contact area between the holding member 102 and the support member 200, thereby improving the cooling efficiency of the exit-side polarizer 11GB. Furthermore, compared to the configuration shown in FIGS. 6 and 7, both the holding member 102 and the support member 200 are bent as shown in FIG. 8. This makes it possible to further increase the contact area between the holding member 102 and the support member 200, thereby further improving the cooling efficiency of the exit-side polarizer 11GB.

[0084] In each of the configurations shown in Figures 5 to 8, if a conventional densely formed metal frame member other than a vapor chamber is retained as the holding member for the exit side polarizer 11GB, the metal frame member is arranged between the polarizer support portion 141 of the holding member 102 and the exit side polarizer 11GB in a direction parallel to the optical axis of the image light IG.

[0085] [Third Modification] 9 to 11 are schematic diagrams showing the positional relationship between the emission-side polarizing plate 11GB and the polarizing plate support portion 141 of the holding member 102 of the projector 1 and a third modified example of the projector 1. In the projector 1 of the embodiment described above, as shown in FIG. 9, when viewed along the optical axis of the image light IG incident on the emission-side polarizing plate 11GB, the outer edge 11Gr of the rectangular emission-side polarizing plate 11GB does not overlap with the edge of the opening 142 formed in the polarizing plate support portion 141 of the holding member 102, but is located in an area outside the edge of the opening 142. In the third modified example, when viewed along the optical axis of the incident image light IG, two sides of the outer edge 11Gr of the emission-side polarizing plate 11GB parallel to the vertical direction may be located in an area outside the edge of the opening 142, and two sides of the outer edge 11Gr of the emission-side polarizing plate 11GB parallel to the horizontal direction may overlap with the edge of the opening 142.

[0086] 11 , when viewed along the optical axis of image light IG incident on the exit-side polarizing plate 11GB, the outer edge 11Gr of the exit-side polarizing plate 11GB may overlap the edge of the opening 142. That is, the exit-side polarizing plate 11GB may be fitted into the opening 142. In this case, the side of the exit-side polarizing plate 11GB abuts against the side of the edge of the opening 142 of the polarizing plate support portion 141 of the holding member 102.

[0087] In the third variant, when heat is generated in the emission-side polarizer 11GB due to the image display operation of the projector 1, the heat from the emission-side polarizer 11GB is transferred from the side of the emission-side polarizer 11GB to a plate-shaped portion of the heat-receiving portion 151, including the side that overlaps with the edge of the opening 142, and the refrigerant COG in the hollow 262 of the heat-receiving portion 151 changes from liquid to gas due to the heat transferred to the hollow 262.

[0088] 11 of the third modified example, when the polarizer support portion 171 of the holding member 103 is viewed along the incident direction of the image light IB (when the first base material is viewed in a plan view) (when viewed from a direction along the optical axis of the output-side polarizer 11BB), the edge of the opening and the outer edge of the output-side polarizer (first polarizer) 11BB overlap each other. According to the projector 1, the entire outer periphery of the output-side polarizer 11BB contacts the heat-receiving portion 181 of the holding member 103, so that the contact area between the holding member 103 and the support member 200 can be easily increased, and the cooling efficiency of the output-side polarizer 11BB can be improved.

[0089] [Fourth Modification] 12 to 14 are schematic diagrams showing the positional relationship between the exit-side polarizer 11GB and the polarizer support portion 141 of the holding member 102 in a fourth modified example of the projector 1. In the fourth modified example, a conventional metal frame member 500 may be used for the exit-side polarizer 11GB in addition to the holding member 102. For example, as shown in FIG. 12, the polarizer support portion 141 of the holding member 102, the frame member 500, and the exit-side polarizer 11GB may be arranged in contact with one another in this order along the optical axis of image light IG emitted from a liquid crystal panel 4G (not shown). The frame member 500 has the same shape and size as the polarizer support portion 141 when viewed along the optical axis of the image light IG. An opening 502 of the same size and shape as the opening 142 is formed in the frame member 500. The frame member 500 is made of, for example, stainless steel (SUS). 12, the heat of the exit-side polarizing plate 11GB is transferred from the plate surface 11Gq to the frame member 500, and then transferred via the frame member 500 from the plate surface 102p of the holding member 102 to the polarizing plate support portion 141 and the heat receiving portion 151. The principle by which the exit-side polarizing plate 11GB is subsequently cooled is the same as in the projector 1 of the above-described embodiment.

[0090] 13, when viewed along the direction in which image light IG emitted from a liquid crystal panel 4G (not shown) enters, the polarizer support portion 141 of the holding member 102 and the frame member 500 may be sequentially arranged with the openings 502, 142 aligned, and the exit-side polarizer 11GB may be arranged on the opposite side of the frame member 500 from the polarizer support portion 141. The polarizer support portion 141 and the heat-receiving portion 151 protrude parallel to the optical axis of the image light IG from a plate-like portion of the holding member 102 extending parallel to the side surface 5CG of the cross dichroic prism 5 (not shown) toward the exit-side polarizer 11GB and bend toward the outer edge 11Gr of the exit-side polarizer 11GB. Therefore, the exit-side polarizer 11GB is fitted into the opening 142 and abuts against the side surfaces of the polarizer support portion 141 and the heat-receiving portion 151 that form the edge of the opening 142, similar to the configuration shown in FIG. 11 for the third modification. Furthermore, a protrusion 148 is provided from the position where the polarizing plate support portion 141 and the heat receiving portion 151 protrude from the plate-like portion of the holding member 102 to a position that is the same as the edge of the opening 502 of the frame member 500 when viewed along the direction in which the image light IG is incident. The frame member 500 is sandwiched between the protrusion 148 and the polarizing plate support portion 141 and the heat receiving portion 151 in the direction along the optical axis of the image light IG. The cooling mechanism for the exit-side polarizing plate 11GB shown in FIG. 13 can improve the cooling efficiency and strength of the exit-side polarizing plate 11GB.

[0091] 14, an exit-side polarizing plate 11GB may be disposed between a frame member 500, which has openings 502, 142 aligned in the direction in which image light IG emitted from a liquid crystal panel 4G (not shown) is incident, and the polarizing plate support portion 141 and heat receiving portion 151 of the holding member 102. When viewed along the optical axis of the image light IG, the openings 142, 502 and at least the area of ​​the exit-side polarizing plate 11GB irradiated with green light G overlap each other. The cooling mechanism for the exit-side polarizing plate 11GB shown in FIG. 14 can improve the cooling efficiency and strength of the exit-side polarizing plate 11GB.

[0092] [Fifth Modification] 15 and 16 are schematic diagrams showing the configuration of a cooling mechanism for the exit-side polarizing plate 11GB of a fifth modified example of the projector 1. In the fifth modified example, as shown in FIG. 15, in the projector 1 of the embodiment described above, the support member 200 is in contact with the cross dichroic prism 5. The bottom surface 200b of the support member 200 abuts against the surface 5a of the cross dichroic prism 5. The cross dichroic prism 5 is directly supported between the support member 200 connected to the wall portion 272 of the support member 271 and the prism support portion 274.

[0093] In the cooling structure of the emission-side polarizing plate 11GB of the fifth modified example, a light-transmitting substrate 300 is provided between the polarizing plate supporting portion 141 and the heat-receiving portion 151 of the holding member 102 and the emission-side polarizing plate 11GB in a direction along the optical axis of the image light IG emitted from the liquid crystal panel 4G (not shown). The light-transmitting substrate 300 is made of a substrate that is transmissive to light in the visible wavelength range and has excellent heat dissipation properties, such as sapphire glass.

[0094] 15, the exit-side polarizing plate 11GB is in contact with the cross dichroic prism 5. That is, the plate surface 11Gp of the exit-side polarizing plate 11GB is in contact with the side surface 5CG of the cross dichroic prism 5.

[0095] 16 , in the projector 1 of the above-described embodiment, the support member 200 is not provided, and a portion of the connection portion 155 of the holding member 102 and the heat dissipation portion 161 may be in contact with the cross dichroic prism 5. The heat receiving portion 211 and a portion of the transport portion 212 of the heat pipe 210 may be in contact with the cross dichroic prism 5. That is, a portion of the connection portion 155 and the plate surface 102p of the holding member 102 that constitutes the heat dissipation portion 161 are in contact with the surface 5a of the cross dichroic prism 5. The bottom surface of the heat dissipation portion 161 and at least the bottom end of the portion of the transport portion 212 that extends parallel to the surface 5a are in contact with the surface 5a of the cross dichroic prism 5.

[0096] 16, in the cooling structure of the exit-side polarizing plate 11GB of the fifth modified example, the exit-side polarizing plate 11GB is in contact with the cross dichroic prism 5. That is, the plate surface 11Gp of the exit-side polarizing plate 11GB is in contact with the side surface 5CG of the cross dichroic prism 5. The light-transmitting substrate 300 is disposed between the polarizing plate supporting portion 141 and the heat receiving portion 151 of the holding member 102 and the exit-side polarizing plate 11GB in the direction along the optical axis of the image light IG.

[0097] The projector 1 to which the fifth modification is applied includes a cross dichroic prism (prism) 5 that receives a predetermined polarization (light) of the image light IG that has passed through an exit-side polarizing plate (first polarizing plate) 11GB and changes the optical path of the image light IG in a direction toward the projection optical system 12. A holding member (first base material) 102 is fixed to the cross dichroic prism 5. According to the projector 1, the cross dichroic prism 5 can be used as a heat dissipation member, and therefore the number of components in the cooling mechanism for the exit-side polarizing plate 11GB and the number of components in the projector 1 can be reduced, and the cooling efficiency of the exit-side polarizing plate 11GB can be improved.

[0098] Furthermore, in the projector 1 to which the fifth modified example is applied, the exit-side polarizing plate (first polarizing plate) 11GB abuts against the cross dichroic prism 5. According to the projector 1, the heat of the exit-side polarizing plate 11GB is not only dissipated from the plate surface 11Gq of the exit-side polarizing plate 11GB to the holding member 102, but also dissipated from the plate surface 11Gp of the exit-side polarizing plate 11GB to the cross dichroic prism 5, thereby improving the heat dissipation and cooling efficiency of the exit-side polarizing plate 11GB.

[0099] In addition, in the cooling mechanism of the exit-side polarizer 11GB of the fifth modified example illustrated in Figures 15 and 16, at least one of the exit-side polarizer 11GB and the light-transmitting substrate 300 may be arranged on the incident side of the image light IG rather than the polarizer support portion 141 and the heat receiving portion 151 of the holding member 102, and may be in contact with the polarizer support portion 141 and the heat receiving portion 151.

[0100] In the projector 1, the exit-side polarizing plate (first polarizing plate) 11GB has a plate surface (first surface) 11Gq to which the holding member 102 is fixed, and a plate surface (second surface) 11Gp opposite to the plate surface 11Gq. A light-transmitting substrate 300 is fixed to the plate surface 11Gq of the exit-side polarizing plate 11GB. According to the projector 1, heat from the exit-side polarizing plate 11GB is dissipated not only to the holding member 102 but also to the light-transmitting substrate 300, thereby improving the heat dissipation and cooling efficiency of the exit-side polarizing plate 11GB. Furthermore, according to the projector 1, the plate surface 11Gp of the exit-side polarizing plate 11GB is in contact with the plate surface 300p of the light-transmitting substrate 300, and the exit-side polarizing plate 11GB is supported by the light-transmitting substrate 300, thereby improving the strength of the exit-side polarizing plate 11GB.

[0101] In the projector 1, the plate surface (fourth surface) of the light-transmitting substrate 300 opposite to the plate surface (third surface) 300p to which the exit-side polarizing plate (first polarizing plate) 11GB is fixed is in contact with the cross dichroic prism 5. According to the projector 1, not only is heat from the exit-side polarizing plate 11GB radiated from the plate surface 11Gq of the exit-side polarizing plate 11GB to the holding member 102, but also the heat is radiated from the plate surface 11Gp of the exit-side polarizing plate 11GB to the cross dichroic prism 5 via the plate surface 300p of the light-transmitting substrate 300 and the plate surface 300q opposite to the plate surface 300p, thereby improving the heat dissipation and cooling efficiency of the exit-side polarizing plate 11GB.

[0102] [Sixth Modification] 17 to 24 are each a schematic diagram showing the configuration of a cooling mechanism for the emission-side polarizing plate 11GB of a sixth modified example of the projector 1. For example, as shown in Fig. 17, in the cooling mechanism for the emission-side polarizing plate 11GB of the projector 1 of the embodiment described above, a light-transmitting substrate 300 may be arranged between the polarizing plate supporting portion 141 and the heat receiving portion 151 of the holding member 102 and the emission-side polarizing plate 11GB in the direction along the optical axis of the image light IG.

[0103] 17, the connection portion 155 of the holding member 102 extends from the bottom end of the polarizing plate support portion 141 parallel to the side surface 5CG of the cross dichroic prism 5 on which the image light IG is incident, downward beyond the bottom surface 5b of the cross dichroic prism 5, and bends downward below the bottom surface 5a toward the space above the bottom surface 5b. In the configuration shown in Fig. 18, the heat dissipation portion 161 of the holding member 102 extends from an end of the connection portion 155 opposite the end connected to the polarizing plate support portion 141 and positioned below the bottom surface 5b of the cross dichroic prism 5, toward the side surface 5CM of the cross dichroic prism 5 from which the image light IM emerges. The prism support portion (support member) 274 of the support member 271 is used as a heat dissipation member. A recess 276 is formed in a region of the bottom surface 274b of the prism support part 274 that overlaps with the heat dissipation part 161 when viewed along an imaginary axis perpendicular to the bottom surface 5b of the cross dichroic prism 5. At least an upper part of the heat dissipation part 161 is housed in the recess 276.

[0104] At least the upper part of the heat receiving section 211 of the heat pipe 210 is housed in the recess 276. The transport section 212 extends from the end connected to the heat receiving section 211 toward the wall section 272 of the support member 271 (not shown), and then bends downward. The other end of the transport section 212 opposite the end connected to the heat receiving section 211 is located in the space below the cross dichroic prism 5 and the prism support section 274. In the cooling mechanism for the exit-side polarizing plate 11GB shown in FIG. 18, the heat pipe 210 is used to pull the heat dissipation section 213 and the heat dissipation member 220 out to the area below the cross dichroic prism 5, allowing them to be located in a location where air cooling is easy. This improves the cooling efficiency of the projector 1.

[0105] 17 and 18, the cooling mechanism for the exit-side polarizing plate 11GB has the same effects as the cooling mechanisms for the exit-side polarizing plates 11RB, 11GB, and 11BB of the projector 1 according to the embodiment described above. In the cooling mechanism for the exit-side polarizing plate 11GB shown in Fig. 18, a gap is provided between the surface 274a of the prism support portion 274 of the support member 271 and the bottom surface 5b of the cross dichroic prism 5, but the surface 274a of the prism support portion 274 may be in contact with the bottom surface 5b of the cross dichroic prism 5.

[0106] 17, the exit-side polarizing plate 11GB may be fitted into an opening 142 formed in the polarizing plate support portion 141 of the holding member 102. The light-transmitting substrate 300 may be disposed in an area closer to the incident side of the image light IG exiting from the liquid crystal panel 4G (not shown) than the polarizing plate support portion 141 and the heat-receiving portion 151 of the holding member 102, and may be in contact with the polarizing plate support portion 141 and the heat-receiving portion 151. The cooling mechanism for the exit-side polarizing plate 11GB shown in FIG. 19 provides the same effects as the cooling mechanisms for the exit-side polarizing plates 11RB, 11GB, and 11BB of the projector 1 of the embodiment described above.

[0107] 20, in the configuration shown in FIG. 19, the light-transmitting substrate 300 may be disposed in a region on the emission side of the image light IG emitted from the liquid crystal panel 4G (not shown) relative to the polarizer support portion 141 and the heat-receiving portion 151 of the holding member 102. Also, in the configuration shown in FIG. 19, instead of the heat pipe 210 and the heat-dissipating member 220, a heat sink 224 may be provided on the plate surface 102q of the holding member 102 constituting the heat-receiving portion 151. The cooling mechanism for the emission-side polarizer 11GB shown in FIG. 20 achieves the same effects as the cooling mechanisms for the emission-side polarizers 11RB, 11GB, and 11BB of the projector 1 of the above-described embodiment, thereby enabling space saving of the entire cooling mechanism. Furthermore, the light-transmitting substrate 300 in contact with the plate surface 102p of the holding member 102 constituting the heat-receiving portion 151 can improve the strength of the emission-side polarizer 11GB.

[0108] 21, in the cooling mechanism for the exit-side polarizing plate 11GB of the projector 1 of the embodiment described above, the distance g between the side surface 5CM and the plate surface 11Gp of the exit-side polarizing plate 11GB that faces the side surface 5CM of the cross dichroic prism 5 may be increased. This allows air to be supplied from a cooling fan (not shown) inside the projector 1 to be supplied between the exit-side polarizing plate 11GB, which generates a large amount of heat, and the cross dichroic prism 5 when the projector 1 is operating, thereby improving the cooling efficiency of the exit-side polarizing plate 11GB.

[0109] 22, in the cooling mechanism for the exit-side polarizer 11GB of the projector 1 according to the embodiment described above, a frame member 500 may be provided between the polarizer support portion 141 and the heat receiving portion 151 of the holding member 102 and the exit-side polarizer 11GB along the optical axis of the image light IG emitted from the liquid crystal panel 4G (not shown). When viewed along the optical axis of the image light IG, the edges of the openings 142 and 502 overlap. Alternatively, the plate surface 11Gp of the exit-side polarizer 11GB may abut against the side surface 5CG of the cross dichroic prism 5, and the exit-side polarizer 11GB may be in contact with the cross dichroic prism 5. A heat sink 226 made up of multiple heat dissipation plates 222 may be provided on the surface 200a of the support member 200 that is closer to the side surface 5CM of the cross dichroic prism 5. The multiple heat dissipation plates 222 are arranged at intervals from one another on a plane parallel to the surface 200a. The plate surfaces of the multiple heat sinks 222 are perpendicular to the surface 200a of the support member 200. The cooling mechanism for the emission-side polarizing plate 11GB shown in Fig. 22 has the same effects as the cooling mechanisms for the emission-side polarizing plates 11RB, 11GB, and 11BB of the projector 1 of the embodiment described above, and can reduce the space required for the entire cooling mechanism.

[0110] 23, in the cooling mechanism for the exit-side polarizing plate 11GB of the first modified example shown in FIG. 4, the extension 158 of the holding member 102 may extend upward from the upper end of the polarizing plate support member 141. In this case, the heat dissipation member 161 is connected to the upper end of the extension 158. As described in the first modified example, the heat sink 224 may be provided on either the plate surface 102q or 102p of the heat dissipation member 161. The holding member 102 may have a protrusion 159 that protrudes from the plate surface 102p parallel to the surface 5a of the cross dichroic prism 5 so as to overlap with the support member 200. In this case, at least a lower portion of the protrusion 159 that overlaps with the support member 200 when viewed in a direction parallel to a virtual axis perpendicular to the surface 5a of the cross dichroic prism 5 may be accommodated in the recess 204 of the support member 200. The holding member 102 may not have the protrusion 159 and may be connected to or supported by a support member (not shown) inside the projector 1. The cooling mechanism for the exit-side polarizer 11GB shown in FIG. 23 achieves the same effects as the cooling mechanism for the exit-side polarizer 11GB of the first modified example. Furthermore, the cooling mechanism for the exit-side polarizer 11GB shown in FIG. 23 uses the extension 158 to pull out the heat dissipation section 161 and the heat sink 224 to an area above the cross dichroic prism 5, allowing them to be placed in a location where they can be easily air-cooled. This improves the cooling efficiency of the exit-side polarizer 11GB.

[0111] 17, the emission-side polarizing plate 11GB may be in contact with the plate surface 102q that constitutes the polarizing plate support portion 141 and the heat-receiving portion 151 of the holding member 102, and may be disposed in an area on the incident side of the image light IG with respect to the polarizing plate support portion 141 and the heat-receiving portion 151, as shown in FIG. 24. Furthermore, the light-transmitting substrate 300 may be disposed in an area on the incident side of the image light IG with respect to the emission-side polarizing plate 11GB, and may be in contact with the emission-side polarizing plate 11GB. The cooling mechanism for the emission-side polarizing plate 11GB shown in FIG. 24 provides the same effects as the cooling mechanism for the emission-side polarizing plate 11GB shown in FIG.

[0112] [Seventh Modification] 25 and 26 are schematic diagrams showing the configuration of a cooling mechanism for the exit-side polarizer 11GB of a seventh modified example of the projector 1. In the cooling mechanism for the exit-side polarizer 11GB of the sixth modified example shown in FIG. 17, as shown in FIG. 25, the polarizer support portion 141 of the holding member 102 may have a two-layer structure in the direction along the optical axis of the image light IG exiting from the liquid crystal panel 4G (not shown). That is, the polarizer support portion 141 is composed of a first polarizer support portion 145 and a second polarizer support portion 146. The first polarizer support portion 145 is formed in the same manner as the polarizer support portion 141 of the holding member 102 in the cooling mechanism for the exit-side polarizer 11GB of the above-described embodiment or shown in FIG. 17, and is connected at a connection portion 155 on the same plane as a portion extending parallel to the side surface 5CG of the cross dichroic prism 5. The second polarizer support member 146 is provided in an area on the incident side of the image light IG emitted from the liquid crystal panel 4G (not shown) through the bent portion of the connection member 155, i.e., an area away from the side surface 5CG of the cross dichroic prism 5. The second polarizer support member 146 includes a protrusion 312 and a support member 314. The protrusion 312 extends so as to be flush with the portion of the connection member 155 that extends parallel to the surface 5a of the cross dichroic prism 5. The support member 314 extends from the end of the protrusion 312 opposite the end connected to the connection member 155, parallel to the side surface 5CG of the cross dichroic prism 5 and the polarizer support member 141. An opening 315 that overlaps with the opening 142 when viewed along the optical axis of the image light IG is formed in the support member 314.

[0113] 25, the light-transmitting substrate 300 and the light-exiting-side polarizing plate 11GB are sequentially arranged in the direction in which the image light IG is incident. That is, the plate surface 11Gq of the light-exiting-side polarizing plate 11GB is in contact with the plate surface of the light-transmitting substrate 300. The light-transmitting substrate 300 and the light-exiting-side polarizing plate 11GB are supported by being sandwiched between the polarizing plate supporting portion 141 and the supporting portion 314 of the holding member 102.

[0114] In the configuration shown in Figure 25, as shown in Figure 26, the protrusion 312 of the holding member 102 may be provided on the surface of the part of the connecting portion 155 that extends parallel to the surface 5a of the cross dichroic prism 5, i.e., on the plate surface 102q that is parallel to the surface 5a of the holding member 102 that constitutes the connecting portion 155.

[0115] 25 and 26, the cooling mechanism for the exit-side polarizer 11GB of the seventh modified example has the same effects as the cooling mechanism for the exit-side polarizer 11GB of the sixth modified example. Furthermore, in the cooling mechanism for the exit-side polarizer 11GB of the seventh modified example, heat from the exit-side polarizer 11GB is transferred from the plate surface 11Gq to the light-transmitting substrate 300, from the heat-receiving portion 151 to the support portion 314, the protrusion 312, the connection portion 155, and the heat-dissipating portion 161. Heat from the exit-side polarizer 11GB is transferred from the plate surface 11Gp to the heat-receiving portion 151, from the polarizer support portion 141 to the connection portion 155, and the heat-dissipating portion 161. In this way, the heat from the exit-side polarizer 11GB is dissipated by the heat-dissipating portion 161 of the holding member 102 through two systems, and then by the heat-dissipating member 220 of the heat pipe 210, for example. Therefore, according to the cooling mechanism for the exit-side polarizer 11GB of the seventh modified example, the heat of the exit-side polarizer 11GB can be efficiently dissipated in two systems, thereby improving cooling efficiency. Also, according to the cooling mechanism for the exit-side polarizer 11GB of the seventh modified example, the exit-side polarizer 11GB is supported by being sandwiched between the polarizer support portion 141 of the holding member 102, the support portion 314, and the light-transmitting substrate 300, thereby improving the strength of the exit-side polarizer 11GB.

[0116] Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the specific embodiment, and various modifications and variations are possible within the scope of the gist of the present invention as set forth in the claims. Furthermore, the components of the above-described embodiment and multiple modifications can be combined as appropriate.

[0117] For example, FIG. 27 is a schematic diagram showing the positional relationship between the exit-side polarizing plate 11GB and the polarizing plate support portion 141 of the holding member 102 in a modified example of the projector 1. In the above-described embodiments and modifications, including the configurations illustrated in FIGS. 9 to 11, the exit-side polarizing plates 11RB, 11GB, and 11RR are bonded to the polarizing plate support portions 111, 141, and 171 of the holding members 101, 102, and 103 using an adhesive (not shown). However, as shown in FIG. 27, the exit-side polarizing plates 11RB, 11GB, and 11RR may be supported by, for example, a plurality of leaf springs 331-334 without using the adhesive. The plurality of leaf springs 331-334 protrude into the openings 112, 142, and 172 when viewed from the edges of the polarizing plate support portions 111, 141, and 171 that form the edges of the openings 112, 142, and 172 along the optical axes of the image lights IR, IG, and IB. The number of leaf springs is not limited to four as illustrated in FIG. 27, but may be at least two to match the arrangement of each leaf spring at the edge of the polarizer support portion 111, 141, 171 that forms the edge of the opening 112, 142, 172, and may be changed as appropriate.

[0118] Furthermore, in the above-described embodiment and each modified example, a structure in which the exit-side polarizers 11RB, 11GB, and 11RR are held by holding members 101, 102, and 103 is exemplified, but the same effect as in the above-described embodiment can also be achieved by holding the entrance-side polarizer by holding members 101, 102, and 103.

[0119] In the above-described embodiment and each modified example, the polarizer cooling mechanism according to the present invention has been described using a projector 1 including three liquid crystal panels 4R, 4G, and 4B and exit-side polarizers 11RB, 11GB, and 11RR. However, the polarizer cooling mechanism according to the present invention can be applied to a projector or image display device including at least one liquid crystal panel and polarizer. FIGS. 28 and 29 are schematic diagrams showing the configuration of a projector including one liquid crystal panel and an exit-side polarizer. For example, the polarizer cooling mechanism according to the present invention may be applied to a projector in which red, green, and blue are each modulated in time series by one liquid crystal panel, as shown in FIG. 28, and the generated image light is converted in time series into first polarizations of the image light of each color by one exit-side polarizer. Alternatively, it may be applied to a single-panel projector as shown in FIG. 29.

[0120] Fig. 30 is a plan view of the main parts of the cooling mechanism for the exit-side polarizers 11RB, 11GB, and 11RR in the above-described embodiment. In the above-described embodiment and each modified example, as shown in Fig. 30, holes 526, 527, and 528, as in the conventional art, are not formed in the support member 200 and in the connection portions 125, 155, and 185 of the holding members 101, 102, and 103 of the exit-side polarizers 11RB, 11GB, and 11RR that extend parallel to the surface 5a of the cross dichroic prism 5. Note that the support member 200 is omitted in Fig. 30. When a gap is provided between plate surfaces 11Rp, 11Gp, 11Bp of exit-side polarizers 11RB, 11GB, 11RR and side surfaces 5CR, 5CG, 5CB of cross dichroic prism 5 and air is supplied to the gap, the cooling mechanisms for exit-side polarizers 11RB, 11GB, 11RR of the above-described embodiment and each modified example efficiently circulate between each of exit-side polarizers 11RB, 11GB, 11RR and cross dichroic prism 5 without cooling air CW leaking above connecting portions 125, 155, 185 or support member 200. As a result, the cooling mechanisms for exit-side polarizers 11RB, 11GB, 11RR of the above-described embodiment and each modified example can improve the cooling efficiency of exit-side polarizers 11RB, 11GB, 11RR.

[0121] The projector according to an aspect of the present invention may have the following configuration. One embodiment of the projector of the present invention comprises a light source that emits a first light, a first liquid crystal panel that modulates the first light, a first polarizing plate that transmits a first polarization of the first light, and a first substrate that holds the first polarizing plate and has a first opening formed in an area facing the area where the first light is incident on the first polarizing plate, wherein the first substrate has a heat receiving section that receives heat from the first polarizing plate and a heat dissipation section that dissipates the heat received by the heat receiving section, and is a vapor chamber that vaporizes a liquid refrigerant sealed inside by the heat received by the heat receiving section and condenses the gaseous refrigerant into a liquid refrigerant by dissipating the heat of the gaseous refrigerant in the heat dissipation section.

[0122] The projector according to one aspect of the invention may further include a prism that receives the light that has passed through the first polarizing plate and changes the optical path of the light, and the first base material may be fixed to the prism.

[0123] A projector according to one aspect of the invention may include a prism onto which light transmitted through the first polarizing plate is incident, and a support member that supports the prism and the first base material, and the support member may have a heat dissipation portion.

[0124] In the projector according to one aspect of the invention, the first base material may have a bent portion that is bent in the direction in which the support member extends, and the bent portion may be in contact with the surface of the support member.

[0125] In the projector according to one aspect of the invention, when the first base is viewed from above, the edge of the first opening and the outer edge of the first polarizing plate may overlap each other.

[0126] In the projector according to one aspect of the invention, the first polarizing plate may be in contact with the prism.

[0127] In one embodiment of the projector of the present invention, the first polarizing plate has a first surface to which the first base material is fixed and a second surface opposite to the first surface, and a light-transmitting substrate may be fixed to the second surface.

[0128] In the projector according to one aspect of the invention, a fourth surface of the light-transmitting substrate opposite to the third surface to which the first polarizing plate is fixed may be in contact with a prism.

[0129] In the projector according to one aspect of the invention, light modulated by the first liquid crystal panel may be incident on the first polarizing plate.

[0130] In one aspect of the projector of the present invention, the light source emits second light having a color different from the first light and third light having a color different from both the first light and the second light, and includes a second liquid crystal panel that modulates the second light, a third liquid crystal panel that modulates the third light, a second polarizing plate that transmits a second polarized light of the second light, a third polarizing plate that transmits a third polarized light of the third light, a second substrate that holds the second polarizing plate and has a second opening formed in an area facing the area where the second light is incident on the second polarizing plate, and a third substrate that holds the third polarizing plate and has a third opening formed in an area facing the area where the third light is incident on the third polarizing plate, and the second substrate and the third substrate may be fixed to a support member. [Explanation of symbols]

[0131] 1...projector, 2...light source device (light source), 4R, 4G, 4B...LCD panels (first LCD panel, second LCD panel, third LCD panel), 5...cross dichroic prism (prism), 11RB, 11GB, 11BB...exit side polarizers (first polarizer, second polarizer, third polarizer), 101, 102, 103...holding members (first substrate, second substrate, third substrate), 112, 142, 172...openings, 121, 151, 181...heat receiving section, 131, 161, 191...heat dissipation section, 200...support member, 251, 252, 253...vapor chamber, LB...blue light (first light), LG...green light (first light, second light), LR...red light (first light, third light).

Claims

1. a light source that emits a first light; a first liquid crystal panel that modulates the first light; a first polarizing plate that transmits a first polarized light of the first light; a first base material that holds the first polarizing plate and has a first opening formed in an area of ​​the first polarizing plate that faces an area where the first light is incident; Equipped with The first substrate is a heat receiving section that receives heat from the first polarizing plate; and a heat dissipation section that dissipates the heat received by the heat receiving section, a vapor chamber that vaporizes a liquid refrigerant sealed inside by heat received by the heat receiving portion, and condenses the gaseous refrigerant into the liquid refrigerant by radiating heat of the gaseous refrigerant by the heat radiating portion; a prism onto which light transmitted through the first polarizing plate is incident; a support member that supports the prism and the first substrate; Furthermore, The support member has a heat dissipation portion. projector.

2. the first base material has a bent portion bent in an extending direction of the support member, The bent portion is in contact with the surface of the support member. The projector according to claim 1 .

3. an edge of the first opening and an outer edge of the first polarizing plate overlap each other when the first base is viewed in plan; The projector according to claim 1 or 2.

4. A light source that emits a first light; a first liquid crystal panel that modulates the first light; a first polarizing plate that transmits a first polarized light of the first light; a first base material that holds the first polarizing plate and has a first opening formed in an area of ​​the first polarizing plate that faces an area where the first light is incident; Equipped with The first substrate is a heat receiving section that receives heat from the first polarizing plate; and a heat dissipation section that dissipates the heat received by the heat receiving section, a vapor chamber that vaporizes a liquid refrigerant sealed inside by heat received by the heat receiving portion, and condenses the gaseous refrigerant into the liquid refrigerant by radiating heat of the gaseous refrigerant by the heat radiating portion; an edge of the first opening and an outer edge of the first polarizing plate overlap each other when the first base is viewed in plan; The projector according to claim 1 .

5. a prism onto which the light transmitted through the first polarizing plate is incident and which changes the optical path of the light; the first substrate is fixed to the prism; The projector according to claim 4 .

6. the first polarizing plate is in contact with the prism; The projector according to claim 1 or 5.

7. the first polarizing plate has a first surface to which the first base material is fixed and a second surface opposite to the first surface; a light-transmitting substrate fixed to the second surface; The projector according to claim 1 .

8. a fourth surface of the light-transmitting substrate opposite to a third surface to which the first polarizing plate is fixed, the fourth surface being in contact with a prism into which light transmitted through the first polarizing plate is incident; The projector according to claim 7 .

9. The light modulated by the first liquid crystal panel is incident on the first polarizing plate. The projector according to claim 1 .

10. the light source emits second light having a color different from that of the first light and third light having a color different from that of both the first light and the second light; a second liquid crystal panel that modulates the second light; a third liquid crystal panel that modulates the third light; a second polarizing plate that transmits second polarized light of the second light; a third polarizing plate that transmits third polarized light of the third light; a second base material that holds the second polarizing plate and has a second opening formed in an area of ​​the second polarizing plate that faces an area where the second light is incident; a third base material that holds the third polarizing plate and has a third opening formed in a region of the third polarizing plate that faces a region where the third light is incident; Equipped with the second substrate and the third substrate are vapor chambers, the second substrate and the third substrate are fixed to the support member; The projector according to claim 1 or 2.

Images