JP5150418B2 - LCD projector - Google Patents

Description

  The present invention provides three liquid crystal light valves composed of optical components that transmit light for displaying images, a cooling fan that blows cooling air for cooling the optical components, and supplies cooling air to the optical components. The present invention relates to a liquid crystal projector provided with a duct to be operated.

  In general, a liquid crystal projector has three liquid crystal light valves composed of optical parts that transmit light for displaying an image and cooling for cooling the optical parts in order to suppress a reduction in the lifetime of the optical parts. A cooling fan that blows air and a resin duct that supplies cooling air to the optical component are provided. The duct includes a plurality of outflow portions that allow the cooling air to flow out toward the optical component (see, for example, Patent Document 1).

By the way, when the number of components of an optical element, which is an optical component, increases for the purpose of improving the image quality of an image, it is necessary to change the design so as to effectively cool the optical element according to the liquid crystal projector. As means for effectively cooling the optical element, it is conceivable to add a cooling fan or change the shape of the duct.
JP 2007-298890 A

  However, when a cooling fan is added in order to effectively cool the optical element, there is a problem that the manufacturing cost of the liquid crystal projector increases. Also, when the shape of the duct is changed to effectively cool the optical element, it is necessary to create a mold for molding the duct according to the optical element, which increases the manufacturing cost of the liquid crystal projector. There is a problem of end up.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a liquid crystal projector capable of effectively cooling an optical element while suppressing an increase in manufacturing cost. .

  The invention according to claim 1 includes three liquid crystal light valves composed of optical components that transmit light for displaying an image, a cooling fan that blows cooling air for cooling the optical components, A duct that supplies the cooling air to an optical component, and the duct includes a plurality of outflow portions that allow the cooling air to flow out toward the optical component, wherein one of the three liquid crystal light valves is provided. An optical element that adjusts a polarization state of light having a wavelength region that is included in the predetermined wavelength region and narrower than the predetermined wavelength region for light having a predetermined wavelength region that is transmitted through the liquid crystal light valve; The duct includes, as one outflow portion of the plurality of outflow portions, an optical element outflow portion that causes the cooling air to flow out toward the optical element, By providing a path component that forms the path of the cooling air in the duct, the path component flows out from the outflow portion for the optical element toward the optical element as compared with the case where the path component is not provided in the duct. The gist of the invention is that the cooling air flow is increased.

  According to the present invention, light having a predetermined wavelength region that passes through one of the three liquid crystal light valves has a wavelength region that is included in the predetermined wavelength region and narrower than the predetermined wavelength region. An optical element for adjusting the polarization state of the light is further provided. Therefore, an image with high color reproducibility can be displayed as compared with the case where the polarization state is adjusted with only three liquid crystal light valves. And by providing a path | route component part in a duct, the airflow of the cooling air which flows out toward the said optical element from the outflow part for optical elements which is one outflow part of several outflow parts becomes large. It is configured. For this reason, it is possible to increase the air volume of the cooling air flowing out toward the optical element without adding a cooling fan and without changing the shape of the duct. Accordingly, it is possible to effectively cool an optical element for displaying an image with high color reproducibility while suppressing an increase in manufacturing cost.

  According to a second aspect of the present invention, in the liquid crystal projector according to the first aspect, the duct flows out toward an optical component other than the optical element as one outflow portion of the plurality of outflow portions. The outflow part is provided, and the route component is provided with a wall part for preventing the flow of the cooling air toward the other outflow part.

  According to this invention, the path | route component is equipped with the wall part for preventing the flow of the cooling air which goes to the other outflow part which is not an outflow part for optical elements. Accordingly, the cooling air flow toward the other outflow portion is directed toward the optical element outflow portion so that the amount of the cooling air flowing out from the optical element outflow portion toward the optical element is increased. be able to.

  The invention according to claim 3 is characterized in that, in the liquid crystal projector according to claim 2, the wall portion provided in the path component blocks the flow of the cooling air in the duct. According to this invention, since the wall part with which a path | route component is provided interrupts | blocks the flow of the cooling wind in a duct, it can prevent the flow of a cooling wind reliably.

  According to a fourth aspect of the present invention, in the liquid crystal projector according to any one of the first to third aspects, the cooling fan includes a first cooling fan and a second cooling fan, and the duct includes the duct A first flow path through which the cooling air blown by the first cooling fan flows, a second flow path through which the cooling air blown by the second cooling fan flows, and the first flow path; A communication portion that communicates with the second flow path is provided, and the flow component is provided in a duct, thereby preventing the flow of the cooling air in the communication portion.

  According to this invention, the duct communicates the first flow path through which the cooling air blown by the first cooling fan flows and the second flow path through which the cooling air blown by the second cooling fan flows. Since the communicating part is provided, the cooling air can be blown to the plurality of outflow parts by the plurality of cooling fans. And since the flow component is provided in the duct, the flow of the cooling air in the communicating portion is hindered, so the flow of the cooling air from the first flow path to the second flow path, or from the second flow path By blocking the flow of the cooling air to the first flow path, it is possible to increase the amount of the cooling air flowing out from the optical element outflow portion toward the optical element.

  According to a fifth aspect of the present invention, in the liquid crystal projector according to the fourth aspect, as the three liquid crystal light valves, one liquid crystal light valve that transmits light whose polarization state is adjusted by the optical element is transmitted. And the two liquid crystal light valves excluding the liquid crystal light valve, and the cooling air flowing through the first flow channel flows out toward the optical component constituting the one liquid crystal light valve, and the second flow The gist is that the cooling air flowing through the passage flows out toward the optical components constituting the two liquid crystal light valves.

  According to the present invention, the cooling air that is blown by the first cooling fan and flows through the first flow path flows out toward the optical component constituting one liquid crystal light valve, and is blown by the second cooling fan. The cooling air flowing through the two flow paths flows out toward the optical components constituting the two liquid crystal light valves. For this reason, the optical components constituting the three liquid crystal light valves can be cooled by the first cooling fan and the second cooling fan.

  According to the present invention, it is possible to effectively cool an optical element for displaying an image with high color reproducibility while suppressing an increase in manufacturing cost.

  An embodiment embodied as a liquid crystal projector of the present invention will be described with reference to the drawings. A liquid crystal projector 1 according to an embodiment of the present invention is a projection display apparatus that uses liquid crystal as a light valve and projects and displays an image by projecting light onto a screen.

  As shown in FIG. 1, the liquid crystal projector 1 includes a lamp 11, an integrator lens 12, a polarization conversion element 13, a plurality of condenser lenses 14, a plurality of mirrors 15, dichroic mirrors 16, 17, liquid crystal light valves 20, 30, 40, a dichroic prism 18, and a projection lens 19. Hereinafter, these optical components will be specifically described.

  The lamp 11 that emits light is an ultrahigh pressure mercury lamp in which a mixture of mercury and halogen gas or a mixture of mercury and halide is enclosed in an arc tube 11a formed of quartz glass. The arc tube 11a is covered with a reflector 11b so that light is emitted from the lamp 11 only in a predetermined direction.

  The integrator lens 12 is an optical component composed of two fly-eye lenses 12a and 12b made of heat resistant glass. When the light emitted from the lamp 11 passes through the integrator lens 12, the illuminance distribution of the light is made uniform.

  The polarization conversion element 13 is an optical component that has a polarization separation film and a retardation plate, and converts light emitted from the lamp 11 into linearly polarized light. Specifically, the polarization conversion element 13 separates the P-polarized light and the S-polarized light by the polarization separation film and shifts the phase of either the P-polarized light or the S-polarized light by the phase difference plate, whereby the liquid crystal light valves 20, 30 are used. , 40 is linearly polarized light.

  The condenser lens 14 is a lens that collects the light emitted from the lamp 11 according to the size of the optical component through which the light is transmitted. The mirror 15 is a mirror for guiding the light emitted from the lamp 11 to the liquid crystal light valves 20, 30, 40, the dichroic prism 18, and the projection lens 19 by reflecting the light.

  The dichroic mirror 16 is a mirror that reflects light having a wavelength corresponding to red and green, and the dichroic mirror 17 is a mirror that reflects light having a wavelength corresponding to green. Therefore, light having a wavelength corresponding to blue (hereinafter, “blue light”) is separated from white light emitted from the lamp 11 by the dichroic mirror 16, and light having a wavelength corresponding to red (hereinafter, “red light”) by the dichroic mirror 17. , “Red light”) and light of a wavelength corresponding to green (hereinafter “green light”) are separated.

  The liquid crystal light valve 20 includes an inorganic polarizing plate 21, an incident-side polarizing plate 22, an optical compensation plate 23, a liquid crystal panel 24, a pre-polarizing plate 25, and an output-side polarizing plate 26. Transmits a blue image. From the direction in which light enters the liquid crystal light valve 20, the inorganic polarizing plate 21, the incident-side polarizing plate 22, the optical compensation plate 23, the liquid crystal panel 24, the pre-polarizing plate 25, and the output-side polarizing plate 26 are provided in this order. Therefore, the inorganic polarizing plate 21, the incident side polarizing plate 22, and the optical compensation plate 23 are the incident side optical elements 20a provided on the light incident side of the liquid crystal panel 24, and are the pre-polarizing plate 25 and the outgoing side polarizing plate. Reference numeral 26 denotes an emission side optical element 20 b provided on the light emission side of the liquid crystal panel 24.

  The liquid crystal light valve 30 includes an inorganic polarizing plate 31, an incident side polarizing plate 32, an optical compensation plate 33, a liquid crystal panel 34, a pre-polarizing plate 35, an output side polarizing plate 36, and a Ye modulation element 37. When green light passes through the liquid crystal light valve 30, a green image is generated. From the direction in which light enters the liquid crystal light valve 30, a Ye modulation element 37, an inorganic polarizing plate 31, an incident side polarizing plate 32, an optical compensation plate 33, a liquid crystal panel 34, a pre-polarizing plate 35, and an output side polarizing plate 36 are provided in this order. It has been. Accordingly, the inorganic polarizing plate 31, the incident side polarizing plate 32, the optical compensation plate 33, and the Ye modulation element 37 are incident side optical elements 30 a provided on the light incident side of the liquid crystal panel 34, and are pre-polarizing plates 35. The output side polarizing plate 36 is an output side optical element 30 b provided on the light output side of the liquid crystal panel 34.

  The liquid crystal light valve 40 includes an incident side polarizing plate 42, an optical compensation plate 43, a liquid crystal panel 44, a pre-polarizing plate 45, and an output side polarizing plate 46, and the red light is transmitted through the liquid crystal light valve 40. As a result, a red video is generated. From the direction in which light enters the liquid crystal light valve 40, the incident side polarizing plate 42, the optical compensation plate 43, the liquid crystal panel 44, the pre-polarizing plate 45, and the output side polarizing plate 46 are provided in this order. Therefore, the incident side polarizing plate 42 and the optical compensation plate 43 are incident side optical elements 40 a provided on the light incident side of the liquid crystal panel 44, and the pre-polarizing plate 45 and the outgoing side polarizing plate 46 are the liquid crystal panel 44. This is an emission side optical element 40b provided on the emission side of the light.

  The inorganic polarizing plates 21 and 31 are reflective polarizing plates and are optical components that emit incident polarized light as linearly polarized light. The incident-side polarizing plates 22, 32, and 42 are absorption-type polarizing plates that pass through the optical compensators 23, 33, and 43 and the liquid crystal panels 24, 34, and 44 in order to improve the contrast of images. It is an optical component that absorbs unnecessary reflected light reflected without being reflected. The optical compensators 23, 33, 43 are optical components that compensate for the birefringence of light transmitted through the liquid crystal panels 24, 34, 44.

  The liquid crystal panels 24, 34, and 44 are optical components formed of liquid crystal, a transparent electrode for applying a voltage to the liquid crystal, and glass sandwiching the liquid crystal. The pre-polarizers 25, 35, and 45 are optical components for reducing the burden on the exit-side polarizers 26, 36, and 46 by reducing the amount of light. Further, the exit-side polarizing plates 26, 36, 46 improve the contrast of the image, and the light diffusely reflected between the liquid crystal panels 24, 34, 44 and the exit-side polarizing plates 26, 36, 46, or the dichroic prism 18 It is an optical component that absorbs unnecessary reflected light that is reflected without passing through.

  The Ye modulation element 37 is an optical component that modulates light having a wavelength corresponding to yellow included in green light (hereinafter, “yellow light”) in accordance with a voltage applied to the Ye modulation element 37. 37 is an optical element that adjusts the polarization state of yellow light incident on 37. In other words, the Ye modulation element 37 includes, for green light having a predetermined wavelength region that passes through the liquid crystal light valve 30, yellow light that is included in the wavelength region of green light and has a wavelength region narrower than the wavelength region of green light. It is an optical element that modulates the polarization state according to an applied voltage. Specifically, the Ye modulation element rotates the incident linearly polarized light of yellow light within a range of 0 to 90 degrees around the optical axis and emits the linearly polarized light of incident yellow light, It is an optical element that converts to elliptically polarized light or circularly polarized light. By providing such a Ye modulation element, the liquid crystal projector 1 can display an image with high color reproducibility while suppressing an increase in cost due to an increase in the number of optical components.

  The dichroic prism 18 generates a full-color image by synthesizing the images of the respective colors generated by passing through the liquid crystal light valves 20, 30, and 40. Specifically, the dichroic prism 18 reflects blue light and red light out of light incident from three directions and emits the light to the front of the liquid crystal projector 1 and transmits green light to the front of the liquid crystal projector 1. To do.

  The projection lens 19 is composed of a plurality of lenses. When light emitted from the dichroic prism 18 enters the projection lens 19, the light is emitted in front of the liquid crystal projector 1 to project a full-color image. To display.

  The optical component configured as described above is attached to and supported by a support member provided in the liquid crystal projector 1, and includes an integrator lens 12, a polarization conversion element 13, a condenser lens 14, a mirror 15, a dichroic mirror 16, Reference numeral 17 is attached to a resin base member (not shown) as a support member. In addition, the incident side polarizing plates 22, 32, and 42 and the optical compensation plates 23, 33, and 43 are attached to the base member using a holding member 52 (see FIG. 2).

  The liquid crystal panels 24, 34, 44, the pre-polarizers 25, 35, 45, the output-side polarizers 26, 36, 46, and the dichroic prism 18 are fixed to each other using screws or the like. In this way, the optical components fixed together with the dichroic prism 18 are integrally configured as a prism unit 53 as shown in FIGS.

  As shown in FIGS. 2 and 3, the liquid crystal projector 1 includes a first cooling fan 71, a second cooling fan 72, and an optical cooling fan that blows cooling air for cooling the optical components. And a duct 60 for supplying cooling air to the components. Specifically, a resin-made duct 60 is provided in the vicinity of the prism unit 53, and cooling fans 71 and 72 are connected to the duct 60 for guiding cooling air. In the drawing, the blades constituting the cooling fans 71 and 72 are omitted. Hereinafter, a specific configuration of the duct 60 to which the cooling fans 71 and 72 are connected will be described.

  4 is a perspective view showing the appearance of the duct 60, FIG. 5 is an exploded perspective view of the duct 60, and FIG. 6 is a plan view of the duct 60. FIG. 7 is a plan view of members constituting the duct 60, FIG. 8 is a cross-sectional perspective view of the duct 60 with a section taken along the line AA in FIG. 6, and FIG. It is a cross-sectional perspective view of the duct 60 which made the B section a cross section.

  As shown in FIGS. 4 and 5, the duct 60 includes inflow portions 61 and 62 for allowing the cooling air blown by the cooling fans 71 and 72 to flow into the duct 60, and a flow path that is a space through which the cooling air flows. 60A, 60B, and a plurality of outflow parts 63 to 68 that allow the cooling air in the duct 60 to flow out toward the optical component. As shown in FIG. 5, the duct 60 includes two duct members 60a and 60b. Outlet portions 63 to 68 are formed in the duct member 60a, and flow paths 60A and 60B through which cooling air flows are provided in the duct member 60b. Grooves for forming are formed.

  The inflow portions 61 and 62 are wall portions for connecting the cooling fans 71 and 72. As shown in FIGS. 2 and 3, the inflow portion 61 is connected to the first cooling fan 71 and the inflow portion. The second cooling fan 72 is connected to 62.

  The outflow part 63 is composed of wall parts facing each other through a space, and allows the cooling air to flow out toward the incident side optical element 30a of the liquid crystal light valve 30. As shown in FIG. 8, the outflow portion 63 is opened toward the outflow portion inlet 63a, which is a space opened in the flow path 60A through which the cooling air from the first cooling fan 71 flows, and toward the incident side optical element 30a. And an outflow portion outlet 63b which is a space.

  The outflow portion 64 is made up of wall portions facing each other through a space, and causes the cooling air to flow out toward the emission side optical element 30b of the liquid crystal light valve 30. As shown in FIG. 8, the outflow portion 64 opens toward the outflow portion inlet 64a, which is a space opened in the flow path 60A through which the cooling air from the first cooling fan 71 flows, and toward the emission side optical element 30b. And an outflow portion outlet 64b which is a space.

  As shown in FIGS. 7 and 8, the outflow portions 63 and 64 configured as described above are discharged from the upstream side in the flow direction X1 of the cooling air from the first cooling fan 71 flowing through the flow path 60A. The outflow portion inlets 63a and 64a are configured to open in the order of the portion inlet 63a and the outflow portion inlet 64a.

  The outflow portion 65 is made up of wall portions facing each other through a space, and allows the cooling air to flow out toward the incident side optical element 40 a of the liquid crystal light valve 40. As shown in FIG. 9, the outflow portion 65 is opened toward the outflow portion inlet 65a, which is a space opened in the flow path 60B through which the cooling air from the second cooling fan 72 flows, and the incident side optical element 40a. And an outflow portion outlet 65b which is a space.

  The outflow portion 66 is made up of wall portions facing each other through a space, and allows the cooling air to flow out toward the emission side optical element 40b of the liquid crystal light valve 40. As shown in FIG. 9, the outflow portion 66 opens toward the outflow portion inlet 66a, which is a space opened in the flow path 60B through which the cooling air from the second cooling fan 72 flows, and toward the emission side optical element 40b. And an outflow portion outlet 66b which is a space.

  The outflow portion 67 is made up of wall portions facing each other through a space, and causes the cooling air to flow out toward the incident side optical element 20a of the liquid crystal light valve 20. As shown in FIG. 9, the outflow portion 67 is opened toward the outflow portion inlet 67a, which is a space opened in the flow path 60B through which the cooling air from the second cooling fan 72 flows, and toward the incident side optical element 20a. And an outflow portion outlet 67b which is a space.

  The outflow portion 68 includes wall portions facing each other through a space, and allows the cooling air to flow out toward the emission side optical element 20 b of the liquid crystal light valve 20. As shown in FIG. 9, the outflow portion 68 opens toward the outflow portion inlet 68a, which is a space opened in the flow path 60B through which the cooling air from the second cooling fan 72 flows, and toward the emission side optical element 20b. And an outflow portion outlet 68b which is a space.

  As shown in FIGS. 7 and 9, the outflow portions 65 to 68 configured as described above outflow from the upstream side in the flow direction X2 of the cooling air from the second cooling fan 72 flowing through the flow path 60B. The outflow portion inlets 65a to 68a are configured to open in the order of the portion inlet 65a, the outflow portion inlet 66a, the outflow portion inlet 68a, and the outflow portion inlet 67a.

  In addition, the duct 60 includes a communication portion 60C that is a space for communicating the flow path 60A and the flow path 60B. Specifically, the communication portion 60C is provided on the downstream side of the outflow portion inlet 64a in the flow path 60A, and on the downstream side of the outflow portion inlet 66a and in the upstream side of the outflow portion inlet 68a in the flow path 60B. It has a configuration to be provided.

  According to such a configuration, the duct 60 includes the communication portion 60C that communicates the flow paths 60A and 60B through which the cooling air blown from different cooling fans flows. It is possible to blow cooling air to the outflow portions 63 to 68. Further, by providing a path component that forms the path of the cooling air in the duct 60, for example, the first cooling fan 71 causes the cooling air to flow into the three outflow parts 63, 64, 66 of the plurality of outflow parts 63 to 68. And the second cooling fan 72 can blow cooling air to the plurality of outflow portions 65, 67, 68.

  In the present embodiment, in order to effectively cool the Ye modulation element 37, a sheet metal partition plate 80 shown in FIG. 10 is provided in the duct 60 as a path component constituting the cooling air path in the duct 60. It has a configuration that can be.

  The partition plate 80 includes a partition 81 that partitions the flow path 60B in order to divide the path of the cooling air flowing to the outflow portions 65 and 66 and the path of the cooling air flowing to the outflow portions 67 and 68 in the duct 60, and the flow path 60A. And a wall portion 82 for hindering the flow of cooling air flowing from the first to the flow path 60B. As shown in FIG. 11, the partition plate 80 is provided in the duct 60 by attaching the partition plate 80 to the duct member 60 b so that the wall portion 82 closes the communication portion 60 </ b> C (see FIG. 5). .

  As described above, since the partition plate 80 includes the partition portion 81, the air volume of the cooling air flowing to the outflow portions 65 and 66 and the air volume of the cooling air flowing to the outflow portions 67 and 68 can be adjusted. Further, since the partition plate 80 includes the wall portion 82, the cooling air can be prevented from flowing from the flow path 60A to the flow path 60B.

  Here, in the present embodiment, the duct 60 includes, as one outflow portion of the plurality of outflow portions 63 to 68, an outflow portion 63 for the Ye modulation element that causes the cooling air to flow out toward the Ye modulation element 37. I have. Then, by providing the partition plate 80 in the duct 60, the amount of cooling air flowing out from the outflow portion 63 toward the Ye modulation element 37 is increased as compared with the case where the partition plate 80 is not provided in the duct 60. It is characterized by being configured.

  Specifically, as described above, the duct 60 includes, as one outflow portion among the plurality of outflow portions, an outflow portion 63 that causes the cooling air to flow out toward the incident-side optical element 30a including the Ye modulation element 37, and This is a configuration including an outflow portion 66 that flows out toward the emission side optical element 40b, which is another optical component. The duct 60 is configured to include a communication part 60C that communicates the flow path 60A and the flow path 60B. However, the wall 82 included in the partition plate 80 prevents the flow of cooling air in the communication part 60C, thereby The configuration is such that the flow of cooling air that passes through the communication portion 60C and travels toward the outflow portions 65 to 68 is blocked.

  Thus, by providing the partition plate 80 in the duct 60, the cooling air blown from the first cooling fan 71 is configured not to flow from the channel 60A to the channel 60B, and the partition plate 80 is not provided. Compared to the case, the flow rate of the cooling air flowing from the duct 60 into the outflow portion 63, that is, the amount of cooling air flowing out from the outflow portion 63 toward the Ye modulation element 37 is increased.

  As a result, as shown in FIG. 12, the cooling air blown by the first cooling fan 71 flows through the flow path 60A, so that the optical components constituting the liquid crystal light valve 30 (that is, the incident side optical element 30a and the outgoing light). The cooling air flows out from the outflow portions 63 and 64 toward the side optical component 30b), and the optical components constituting the Ye modulation element 37 and the liquid crystal light valve 30 can be effectively cooled.

  In addition, as shown in FIG. 13, the cooling air blown by the second cooling fan 72 flows through the flow path 60B, so that the optical components (that is, the incident side optical elements 20a, The cooling air flows out from the outflow portions 65 to 68 toward the optical components 40b and 40b and the emission side optical components 20b and 40b), and the optical components constituting the liquid crystal light valves 20 and 30 can be cooled.

According to the liquid crystal projector 1 of the present embodiment, the following effects can be obtained.
(1) The liquid crystal projector 1 includes green light having a predetermined wavelength region that passes through one liquid crystal light valve 30 among the three liquid crystal light valves 20, 30, 40, and is included in the wavelength region and the wavelength region. A Ye modulation element 37 for adjusting the polarization state of yellow light having a narrower wavelength region is provided. Therefore, an image with high color reproducibility can be displayed as compared with the case where the polarization state is adjusted only by the three liquid crystal light valves 20, 30, and 40. Further, the duct 60 includes an outflow portion 63 that causes the cooling air to flow out toward the Ye modulation element 37 as one outflow portion of the plurality of outflow portions 63 to 68. Then, by providing the partition plate 80 that forms the path of the cooling air in the duct 60, the cooling that flows out from the outflow portion 63 toward the Ye modulation element 37 compared to the case where the partition plate 80 is not provided in the duct 60. It is comprised so that the wind volume of a wind may become large. For this reason, the air volume of the cooling air flowing out toward the Ye modulation element 37 can be increased without adding a cooling fan and without changing the shape of the duct. Therefore, the Ye modulation element 37 for displaying an image with high color reproducibility can be effectively cooled while suppressing an increase in manufacturing cost.

  (2) The duct 60 includes, as one outflow portion among the plurality of outflow portions 63 to 68, an outflow portion 66 that causes the outflow portion 66 to flow out toward the emission side optical element 40 b that is an optical component excluding the Ye modulation element 37. The plate 80 includes a wall portion 82 for preventing the flow of cooling air toward the outflow portion 66. Therefore, the cooling air flowing toward the outflow portion 66 is directed toward the outflow portion 63 so that the amount of cooling air flowing out from the outflow portion 63 toward the Ye modulation element 37 can be increased.

  (3) The wall portion 82 provided in the partition plate 80 blocks the flow of cooling air in the duct 60. For this reason, the flow of the cooling air can be reliably prevented, and the cooling air can be prevented from flowing from the channel 60A to the channel 60B.

  (4) The liquid crystal projector 1 includes a first cooling fan 71 and a second cooling fan 72 as cooling fans, and the duct 60 has a flow path 60A through which cooling air blown by the first cooling fan 71 flows. The flow path 60B through which the cooling air blown by the second cooling fan 72 flows, and the communication portion 60C that communicates the flow path 60A and the flow path 60B are provided. For this reason, it is possible to blow cooling air to the plurality of outflow parts 63 to 68 by the plurality of cooling fans 71 and 72. Since the partition plate 80 is provided in the duct 60, the flow of the cooling air in the communication portion 60C is hindered. Therefore, the flow of the cooling air from the flow channel 60A to the flow channel 60B is obstructed, so It can be configured such that the amount of cooling air flowing out toward the modulation element 37 is increased.

  (5) The liquid crystal projector 1 includes, as three liquid crystal light valves, one liquid crystal light valve 30 that transmits light whose polarization state is adjusted by the Ye modulation element 37, and two liquid crystal light valves 20, excluding the liquid crystal light valve 30, 40. Then, the cooling air flowing through the flow path 60A flows out toward the optical components constituting the liquid crystal light valve 30, and the cooling air flowing through the flow path 60B is applied to the optical components constituting the two liquid crystal light valves 20, 40. It flows out towards. Therefore, the optical components constituting the three liquid crystal light valves 20, 30, and 40 can be cooled by the first cooling fan 71 and the second cooling fan 72.

(Other embodiments)
The present invention is not limited to the above embodiment, and various design changes can be made based on the spirit of the present invention, and they are not excluded from the scope of the present invention. For example, the present invention can be changed and implemented as shown below.

  In the above embodiment, the wall portion 82 provided in the partition plate 80 blocks the flow of the cooling air in the duct 60, but prevents the cooling air from flowing from the flow path 60A to the flow path 60B. Any shape that can be suppressed may be used, and the shape of the wall portion 82 may be appropriately changed. Moreover, although the sheet metal partition plate 80 is used as the path component, the path component may be formed of resin.

  In each of the above embodiments, the liquid crystal projector 1 includes the Ye modulation element 37 as an optical element for displaying an image with high color reproducibility, but is not an optical element that adjusts the polarization state of yellow light. Also good. For example, the liquid crystal projector 1 includes, as an optical element for displaying an image with high color reproducibility, red light having a predetermined wavelength region that is transmitted through the liquid crystal light valve 20 and included in the predetermined wavelength region. The optical element which adjusts the polarization state of the light which has a wavelength region narrower than this wavelength region may be provided.

  -In each above-mentioned embodiment, although duct 60 was the composition provided with two inflow parts 61 and 62 and eight outflow parts 63-68, it is not necessary to constitute duct 60 in this way. That is, by providing a path component that forms a cooling air path in the duct 60, an image with high color reproducibility is displayed from a predetermined outflow portion as compared with the case where this path component is not provided in the duct 60. What is necessary is just to be comprised so that the flow volume of the cooling air which flows out toward the optical element for doing may become large. Also in this case, the effect according to the above embodiment can be obtained.

The schematic diagram which shows the structure of the optical component with which the liquid crystal projector which concerns on the one embodiment which actualized the liquid crystal projector of this invention is equipped. The perspective view which shows the optical component which concerns on the embodiment, the duct which distribute | circulates the cooling air for cooling an optical component, and the cooling fan connected to the duct. The perspective view which shows the prism unit which concerns on the embodiment, the optical component and duct provided in the vicinity, and a cooling fan. The perspective view which shows the external appearance of the duct which concerns on the same embodiment. The exploded perspective view of the duct concerning the embodiment. The top view of the duct which concerns on the same embodiment. The top view which shows the flow path of the cooling air with which the duct which concerns on the same embodiment is provided. The perspective view which shows the cross section of the duct of the AA part of FIG. The perspective view which shows the cross section of the duct of the BB part of FIG. (A) (b) The perspective view which shows the external appearance of the path | route component based on the embodiment. (A) (b) The perspective view which shows the state by which the path | route component based on the embodiment was attached to the duct. The perspective view which shows the cross section of the duct of the AA part of FIG. 6 in the state by which the path | route component based on the embodiment was attached to the duct. The perspective view which shows the cross section of the duct of the BB part of FIG. 6 in the state by which the path | route component based on the embodiment was attached to the duct.

Explanation of symbols

  X1, X2 ... Cooling air flow direction, 1 ... Liquid crystal projector, 11 ... Lamp, 11a ... Arc tube, 11b ... Reflector, 12 ... Integrator lens, 12a, 12b ... Fly eye lens, 13 ... Polarization conversion element, 14 ... Condenser Lenses 15 ... Mirrors 16, 17 ... Dichroic mirrors 18 ... Dichroic prisms 19 ... Projection lenses 20, 30, 40 ... Liquid crystal light valves, 20a, 30a, 40a ... Incident side optical elements, 20b, 30b, 40b ... Output side optical element, 21, 31 ... Inorganic polarizing plate, 22, 32, 42 ... Incident side polarizing plate, 23, 33, 43 ... Optical compensator, 24, 34, 44 ... Liquid crystal panel, 25, 35, 45 ... Pre Polarizing plate, 26, 36, 46 ... outgoing side polarizing plate, 37 ... Ye modulation element (optical element), 52 ... holding member, 53 ... prism unit , 60 ... duct, 60A, 60B ... flow path, 60C ... communication part, 60a, 60b ... duct member, 61, 62 ... inflow part, 63 ... outflow part (outflow part for optical element), 64, 65, 66, 67 68 ... Outflow part, 63a, 64a, 65a, 66a, 67a, 68a ... Outlet part inlet, 63b, 64b, 65b, 66b, 67b, 68b ... Outlet part outlet, 71, 72 ... Cooling fan, 80 ... Partition plate ( Path component), 81 ... partitioning part, 82 ... wall part.

Claims (5)

Three liquid crystal light valves composed of optical components that transmit light for displaying an image, a cooling fan that blows cooling air for cooling the optical components, and the cooling air is supplied to the optical components A duct, and the duct includes a plurality of outflow portions that allow the cooling air to flow out toward the optical component.
Polarization of light having a predetermined wavelength region that passes through one of the three liquid crystal light valves and having a wavelength region that is included in the predetermined wavelength region and narrower than the predetermined wavelength region An optical element for adjusting the state;
The duct includes, as one outflow portion of the plurality of outflow portions, an outflow portion for an optical element that causes the cooling air to flow out toward the optical element,
By providing a path component that forms the path of the cooling air in the duct, the path component flows out from the optical element outflow portion toward the optical element as compared with the case where the path component is not provided in the duct. A liquid crystal projector, characterized in that the air volume of the cooling air is increased. The liquid crystal projector according to claim 1,
The duct includes, as one outflow portion of the plurality of outflow portions, another outflow portion that flows out toward an optical component excluding the optical element,
The liquid crystal projector according to claim 1, wherein the path component includes a wall portion for preventing the flow of the cooling air toward the other outflow portion. The liquid crystal projector according to claim 2,
The liquid crystal projector, wherein the wall portion provided in the path component blocks the flow of the cooling air in the duct. The liquid crystal projector according to any one of claims 1 to 3,
The cooling fan includes a first cooling fan and a second cooling fan,
The duct includes a first flow path through which the cooling air blown by the first cooling fan flows, a second flow path through which the cooling air blown by the second cooling fan flows, and the first A communication portion that communicates the first flow path and the second flow path,
The liquid crystal projector according to claim 1, wherein the passage component is provided in the duct, thereby preventing the flow of the cooling air in the communication portion. The liquid crystal projector according to claim 4,
The three liquid crystal light valves include one liquid crystal light valve that transmits light whose polarization state is adjusted by the optical element, and two liquid crystal light valves other than the one liquid crystal light valve.
The cooling air flowing through the first flow path flows out toward the optical components that constitute the one liquid crystal light valve, and the cooling air flowing through the second flow path is the two liquid crystal light valves. A liquid crystal projector that flows out toward the optical component that constitutes the projector.

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