JP2013178416A - Liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a method for ventilating cooling air to a cooling target object with high cooling efficiency and further to provide a structure of preventing increase in a temperature due to cooling unevenness.SOLUTION: A liquid crystal projector comprises: a light source; a polarizing film and a liquid crystal panel arranged on an optical path of light from the light source; a fan that pushes cooling air into the polarizing film and the liquid crystal panel for releasing heat of the polarizing film and the liquid crystal panel; a driving circuit that drives the fan; a duct that guides the cooling air to the polarizing film and the liquid crystal panel; a light composing prism that composes light passing through the polarizing film and the liquid crystal panel; a projection lens that is arranged on an optical axis of composed light; and a nozzle-type duct that is inclined to a light passage surface of any one of the polarizing film and the liquid crystal panel or both thereof, has at least one blowing port surface protruding to a free space and supplies the cooling air to the polarizing film and the liquid crystal panel.

Description

  The present invention relates to a liquid crystal projector, for example, a liquid crystal projector having a structure for cooling an optical component such as a liquid crystal panel and a polarizing plate.

  A liquid crystal projector is used as a device for projecting video images and texts and images created by a computer. The liquid crystal projector separates the light emitted from the light source into light of three colors, red, blue, and green, irradiates the liquid crystal panel corresponding to each color light, and again synthesizes the light emitted from the liquid crystal panel by the light combining prism. , A device that projects onto a screen via a projection lens.

  Various light sources are used in liquid crystal projectors, and high-intensity ultra-high pressure mercury lamps are often used. Since the light emitted from the light source is uneven in polarization, an appropriate contrast cannot be reproduced even if the light is separated and combined into the three primary colors as described above. Therefore, light is adjusted to a linearly deflected state in a predetermined direction by blocking or modulating the polarization that deteriorates the contrast using a polarizing plate. The liquid crystal panel modulates incident light according to a video image or a signal input from a computer. At this time, the liquid crystal panel and the polarizing plate generate heat to absorb the energy of incident light, and the temperature rises. The polarizing plate and the liquid crystal panel change color when the temperature rises excessively, and the image quality of the projected image deteriorates. In order to prevent the deterioration of the image quality, a cooling structure in which the liquid crystal panel and the polarizing plate are set to an appropriate temperature is necessary.

  A general liquid crystal projector forcibly cools air by taking in air from the outside of the housing through an air intake through rotation of a fan installed inside the housing and applying cooling air to an object. In order to prevent image deterioration due to adhesion of dust existing in the cooling air, cooling air from the liquid crystal panel, the deflecting plate, and the like is often guided through a ventilation duct to prevent dust from entering from other parts.

  In recent years, liquid crystal projectors have been demanded by the market to improve the image quality by reducing the size of the housing and increasing the brightness of the light source. The miniaturization of the housing increases the heat generation density and the cooling air volume due to an increase in pressure loss, while the high brightness causes the temperature of the liquid crystal panel and the like to increase due to the increase in light energy. As described above, the image quality is deteriorated. Therefore, in order to meet market needs, it is essential to develop a cooling structure that can improve cooling efficiency.

  Further, in the recent liquid crystal projector market, it is necessary to reduce the cost as the price of the product decreases. Therefore, there is a need for a technology that maintains the quality of images while reducing the cost by reducing the number of optical components such as liquid crystal panels and polarizing plates. If the number of parts is reduced, the light energy absorbed by each part increases, so that the temperature of the optical part increases too much with the same cooling method as before. Therefore, it is necessary to further improve the cooling efficiency.

  From such a background, the prior art document proposes a cooling air introduction mode to the polarizing plate-liquid crystal panel for the purpose of improving the cooling efficiency of the polarizing plate and the liquid crystal panel. For example, Patent Document 1 proposes a structure in which a wind guide plate is provided at the outlet of the ventilation duct to guide cooling air having a component in the vertical direction to the heat generating surface. Proposed is a structure that is installed at an angle to guide the cooling air from the fan in an oblique direction with respect to the heat generation surface.

JP 2003-43444 A JP-A-6-281948

  Patent Document 1 and Patent Document 2 commonly propose a structure for causing cooling air having a component perpendicular to the cooling surface to collide with the cooling surface. When the same amount of cooling air is used, the amount of heat transfer increases in the vicinity of the surface to be cooled by having a component in the vertical direction compared to the case of only the component parallel to the cooling surface, so that the cooling efficiency is improved. I can expect.

  However, in the liquid crystal projector and the cooling device disclosed in Patent Document 1, since the cooling air outlet and the object to be cooled are separated from each other, the flow diffuses before reaching the object to be cooled, and the cooling efficiency decreases with respect to the amount of cooling air. In addition, since the cooling air speed in the vicinity of the cooling target is uneven, there is a concern that a high temperature region may be generated depending on the position of the target surface.

  Further, in the liquid crystal projector disclosed in Patent Document 2, since the outlet of the ventilation duct is along the bottom surface, the loss at the outlet is large and the cooling efficiency is lowered.

  Further, as one of the parameters for improving the cooling efficiency, there is an increase in the cooling wind speed. However, in Patent Document 1 and Patent Document 2, the cross-sectional area of the ventilation duct is common and the cooling wind speed is increased. It does not have a structure that allows

  The present invention eliminates the above situation, and provides a structure for realizing a method of passing cooling air with high cooling efficiency to the object to be cooled, and further preventing temperature rise due to uneven cooling.

  In order to solve the above problems, for example, the configuration described in the claims is adopted.

  The present application includes a plurality of means for solving the above-described problems. To give an example, the present application is characterized by having a structure having a nozzle-type outlet that projects from a ventilation duct toward a cooling target and protrudes into a free space. . This structure prevents diffusion and unevenness of the cooling air, can efficiently supply a high-speed flow to the object to be cooled, and allows cooling air having a component perpendicular to the optical component surface to flow between the components. The amount of heat transfer in the vicinity of the surface to be cooled can be increased, and the cooling efficiency can be improved.

  The nozzle-type outlet is provided with a throttle so that the sectional area of the outlet part protruding into the free space is narrower than the sectional area of the branch part from the main flow part of the ventilation duct. As a result, the speed of the cooling air increases, the amount of heat transfer on the heat generating surface increases, and the cooling efficiency increases.

  This structure can obtain the same effect even when the liquid crystal panel surface is regarded as a glass substrate of a polarizing plate and a single component having a polarizing film attached to the liquid crystal panel surface is cooled.

  According to the present invention, since the cooling efficiency is improved, discoloration of the optical component due to heat can be prevented, and deterioration of the image can be prevented. In addition, for example, since the component temperature can be kept sufficiently lower than the heat-resistant temperature of the component, the life can be extended. By improving the cooling efficiency, the amount of cooling air can be reduced, so that the number of rotations of the fan can be reduced and noise can be reduced. Further, since the light quantity of the lamp can be increased by the amount of the temperature of the optical component, the brightness of the projected image can be increased.

  Further, for example, since the structure in which the glass substrate of the polarizing plate is removed can be realized, the internal structure of the liquid crystal projector can be rationalized, and the cost can be reduced.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

FIG. 3 is a schematic plan configuration diagram of the projection optical system of the liquid crystal projector device according to the first embodiment as viewed from above. FIG. 2 is a perspective view for explaining the internal configuration of the liquid crystal projector apparatus equipped with the projection optical system of FIG. It is a perspective view of the general prism unit vicinity. It is a top view of the vicinity of a general prism unit. It is a side view in the AA cross section in FIG. 4 of the vicinity of a general prism unit. It is a side view in the BB cross section in FIG. 4 of the vicinity of a general prism unit. FIG. 5 is a side view of the vicinity of the prism unit at the time of application of the invention according to Embodiment 1 in the AA cross section in FIG. 4. 3 is a perspective view of the vicinity of a prism unit when the invention according to Embodiment 1 is applied. FIG. FIG. 3 is a schematic diagram of an example of effect verification experiment when applying the invention according to Example 1; 4 is a temperature measurement result of an effect verification experiment when applying the invention according to Example 1. FIG. 5 is a side view of the vicinity of the prism unit at the time of application of the invention according to Embodiment 2 in the AA cross section in FIG. 4.

  Hereinafter, embodiments will be described with reference to the drawings. In addition, in each drawing, since the structure which attached | subjected the same code | symbol shown in drawing already demonstrated has the same function, those description may be abbreviate | omitted.

  FIG. 1 is a schematic plan view of a projection optical system of a liquid crystal projector according to the present embodiment as viewed from above. First, referring to FIG. 1, the light source mounted on the liquid crystal projector according to the first embodiment is changed from the light source to the projection lens. A schematic configuration of the projection optical system will be described.

  As shown in FIG. 1, a liquid crystal projector is roughly divided into a light source unit 3 and a uniform distribution of illuminance distribution of light from the light source unit 3, and a color is separated and irradiated to a liquid crystal panel 6 (6R, 6G, 6B). The optical unit 4 and the prism unit 5 that synthesizes light images formed by the liquid crystal panels 6 (6R, 6G, and 6B) by the light combining prism 8 and projects the light by the projection lens 9.

  The light source unit 3 reflects a light from the lamp 3a selected from an ultra-high pressure mercury lamp, an LED lamp, a xenon lamp, a halogen lamp, and the like, and emits it as a bundle of light (hereinafter referred to as a luminous flux). It comprises a lamp reflector 3b and a lamp lens 3c that cuts out ultraviolet rays.

  The luminous flux emitted from the lamp 3a is incident on a pair of multi-lens arrays 401 and 402 serving as an integrator that cuts ultraviolet rays by the lamp lens 3c and uniformizes the illuminance distribution.

  Convex lenses are two-dimensionally arranged in the multi-lens arrays 401 and 402, and the light beam incident on the multi-lens array 401 forms a light source image two-dimensionally in each cell of the multi-lens array 402. Each condensed light source image is converted by the polarization conversion element 403 into linearly polarized light having a constant vibration direction.

  This is because the liquid crystal panels 6R, 6G, and 6B are designed to pass only linearly polarized light whose vibration direction is constant.

  The light source images divided two-dimensionally by the multi-lens arrays 401 and 402 are superimposed on the liquid crystal panel 6 (6R, 6G, 6B) by the condensing lens 404 having a superimposing action.

  For example, R light (red band light) is reflected by the dichroic mirror 408, and G light (green band light) and B light (blue band light) are reflected by the dichroic mirror 408. The light is transmitted and separated into two colors of light, and the G light and R light are further separated into G light and R light by a dichroic mirror 409. The G light is reflected by the dichroic mirror 409, and the B light is transmitted through the dichroic mirror 409 and separated into three colors. There are various methods for separating the light. The dichroic mirror 408 may reflect the B light to transmit the R light and the G light, or may reflect the G light and transmit the R light and the B light. It is also possible to use a technique.

  Here, the following light separation is assumed.

  The R light is reflected by the dichroic mirror 408, further reflected by the reflection mirror 405, and enters the prism unit 5 through the condenser lens 410. Of the G light and B light transmitted by the dichroic mirror 408, the G light is reflected by the dichroic mirror 409 and enters the prism unit 5 through the condenser lens 411. Further, the B light passes through the dichroic mirror 409, is collected by the first relay lens 413, is reflected by the reflection mirror 406, is collected by the second relay lens 414, is reflected by the reflection mirror 407, and is reflected on the condenser lens 412. And is incident on the prism unit 5.

  In the prism unit 5, the R light liquid crystal panel 6R, the G light liquid crystal panel 6G, and the B light liquid crystal panel 6B are respectively formed on the three adjacent surfaces of the light combining prism 8, and the incident polarizing plates 7aR, 7aG, and 7aB and the outgoing polarized light, respectively. The projection lens 9 is mounted on the remaining surface of the light combining prism 8 disposed between the plates 7bR, 7bG, and 7bB. Each polarizing plate includes at least a polarizing film and a plate-like holding member that holds the polarizing film (such as a glass substrate having a function of transmitting or reflecting light from the light source unit 3 that is a light source).

  The B light, G light, and R light incident on the prism unit 5 pass through the incident-side polarizing plate 7a (RGB), the liquid crystal panel 6 (6R, 6G, 6B), and the outgoing-side polarizing plate 7b (RGB) of each color light. In the process, each optical image is converted into an optical image corresponding to the video signal, and after being synthesized into a color video by the light combining prism 8, the optical image synthesized into the color video is incident on the projection lens incident part 9a and emitted from the projection lens. The image is enlarged and projected from the section 9b and displayed on a screen (not shown).

  The incident side polarizing plate 7a, the outgoing side polarizing plate 7b, and the liquid crystal panel 6 absorb light that could not be transmitted or reflected and generate heat. Since these optical components have a low allowable temperature, they are cooled by the cooling air 72 guided to the optical components by the ventilation duct 71 not shown in FIG. 1 using the panel cooling fan 70.

  In addition, when the light source unit 3 converts electric power into light by the lamp 3a, heat loss occurs in the lamp 3a, and in addition to the visible light component emitted from the lamp 3a, for example, an infrared radiation component is absorbed. It becomes high temperature. Therefore, the cooling fan 10 is used to cool the light source unit 3 with air having a low temperature.

  Next, a liquid crystal projector in which the above-described projection optical system is mounted on a housing will be described with reference to FIG. FIG. 2 is a perspective view for explaining the internal configuration of the liquid crystal projector equipped with the projection optical system of FIG.

  As shown in FIG. 2, in the liquid crystal projector 1, the projection optical system is arranged based on the arrangement of FIG. 1, which is a plan configuration diagram of the projection optical system.

  The liquid crystal projector 1 receives power supply from the power supply unit 2 disposed on the front side of the left side surface in FIG. 2, and emits light from the light source unit 3 disposed on the back side of the left side surface in FIG. 2 is incident on the optical unit 4 arranged at the rear rear part in FIG. The cooling fan 10 is disposed adjacent to the light source unit 3 and is disposed between the light source unit 3 and the power supply unit 2. The drive circuit for driving the cooling fan 10 may be provided in the power supply unit 2 or may be provided in an empty space in the housing.

  As described above with reference to FIG. 1, the light incident on the optical unit 4 is finally enlarged from the projection lens emitting unit 9b and projected onto a screen (not shown).

  A plurality of cooling fans may be used for cooling the prism unit 5. For example, the B panel cooling fan 70a cools the optical component on the side on which the B light is incident, and the RG panel cooling fan 70b cools the optical component on which the R light and the G light are incident.

  Various configurations are conceivable. The optical component on which the B light and the G light are incident may be cooled by the B panel cooling fan 70a, or the optical component on which the R light is incident may be cooled by the RG panel cooling fan 70b. It is also possible to cool with separate fans.

  The ventilation duct 71 is installed so that cooling air other than the optical system is not mixed with the optical component cooling air, and takes in outside air from the ventilation duct intake port 71a using the panel cooling fan 70 installed inside. The cooling air 72 taken in from the ventilation duct intake port 71a through the dust filter 11 is rectified by the ventilation duct 71 and is incident on the incident side polarizing plate 7a (7aR, 7aG, 7aB) and the outgoing side polarizing plate 7b ( 7bR, 7bG, 7bB) and the liquid crystal panel 6 (6R, 6G, 6B) are passed through the surroundings of each component through the ventilation duct 71 and cooled.

  FIG. 3 is a perspective view showing a general configuration of the prism unit. In FIG. 3, the cooling air flows from below the optical component so as to rise, the incident side polarizing plate 7a (7aR, 7aG, 7aB), the outgoing side polarizing plate 7b (7bR, 7bG, 7bB), the liquid crystal panel 6 (6R, 6G and 6B) are passed around the parts via the ventilation duct 71 and cooled. Reference numerals 81R, 81G, and 81B respectively denote a liquid crystal panel-drive board connecting flexible board 81 for R, G, and B.

  FIG. 4 is an enlarged top view of the vicinity of a general prism unit. The incident side polarizing plate 7a (7aR, 7aG, 7aB), the outgoing side polarizing plate 7b (7bR, 7bG, 7bB), the liquid crystal panel 6 (6R, 6G, 6B surrounds the light combining prism 8 with B light, G light, R Cooling air 72 is supplied from a ventilation duct discharge port 71b (71bR, 71bG, 71bB) that is arranged for each light and is provided in the lower part of the gap between the components.

  FIG. 5 is a side view of the vicinity of a general prism unit in the AA cross section in FIG. The incident side polarizing plate 7a and the outgoing side polarizing plate 7b are formed of polarizing films 7aa and 7ba having a polarizing action and glass substrates 7ab and 7bb that support the polarizing film. For the polarizing films 7aa and 7ba, an organic material such as a polarizing film, or a metal deposited film such as aluminum is used. Further, general alkali-free glass, crystal glass, sapphire glass, or the like is used for the glass substrates 7ab and 7bb.

  The liquid crystal panel 6G is connected to the drive substrate 80 via a liquid crystal panel-drive substrate connection flexible 81G. The flexible board may be referred to as a flexible printed board. Further, the drive board may be referred to as a drive circuit board.

  Of the incident-side polarizing plate 7a and the outgoing-side polarizing plate 7b, the polarizing films 7aa and 7ba generate heat mainly by the incidence of light. Thus, by using a material having high thermal conductivity for the glass substrates 7ab and 7bb, heat transfer can be promoted and cooling efficiency can be improved. That is, the glass substrates 7ab and 7bb are not only the holding members for the polarizing films 7aa and 7ba, but also contribute to the improvement of the heat radiation area.

  Next, the problem of the cooling method in a general structure is demonstrated using FIG. 5, FIG.

  In a general structure, as shown in FIG. 5, the ventilation duct discharge port 71b (71bG) of the ventilation duct 71 from the panel cooling fan 70 is provided between the components of the incident side polarizing plate 7a, the liquid crystal panel 6, and the outgoing side polarizing plate 7b. The cooling air 72 supplied through the air flows in parallel to the optical path side surface of each component (for example, the liquid crystal panel 6G, the glass substrates 7ab and 7bb, and the polarizing films 7aa and 7ba) (hereinafter also referred to as parallel flow cooling). ) To cool the parts.

  FIG. 6 is a side view of the vicinity of a general prism unit in the BB cross section in FIG. When the cooling air 72 flows in parallel, as shown by the arrows in FIG. 6, the cooling air diffuses from the ventilation duct discharge port 71b (71bG), so that all the cooling air 72 cannot contribute to cooling of the parts. Cooling efficiency decreases. In addition, because the parts to be cooled are small, the boundary layer on the part surface does not develop to a turbulent boundary layer with a large amount of heat transport, and there is a problem that the heat transfer coefficient on the part surface does not increase and the cooling efficiency reaches its peak. did.

  Therefore, the characteristic structure of the embodiment of the present invention in the liquid crystal projector 1 will be described by omitting the above-described general structure. FIG. 7 is a cross-sectional view illustrating the configuration of the prism unit when the first embodiment is applied. Here, for easier understanding, the polarizing plate on which R light and B light are incident and the liquid crystal panel 6 are not shown, and only the G optical path cross section at the same position as the AA cross section in FIG. 4 is shown.

  In the embodiment of the present invention, in addition to the general structure described above, a nozzle-type ventilation duct 101 protruding into the free space is provided, and from the nozzle-type ventilation duct 101 to the incident side polarizing plate 7 a and the liquid crystal panel 6. In addition to the cooling air 72 that has flowed in parallel, the cooling air is caused to flow in an oblique direction with respect to the incident-side polarizing plate 7a (the glass substrate 7ab and the polarizing film 7aa).

  The nozzle-type ventilation duct outlet 102 is designed such that the cross-sectional area is narrower than the cross-sectional area of the inlet side of the nozzle-type ventilation duct 101. In other words, the outlet section of the nozzle-type duct is characterized in that the tip portion is narrower than the in-pipe cross-sectional area of the duct.

  The nozzle-type ventilation duct 101 allows the cooling air 72 to flow in an oblique direction with respect to the surface of the incident-side polarizing plate 7a, which is a heat generation surface (cooling surface). The cooling efficiency is improved.

  The nozzle-type ventilation duct 101 supplies the cooling air 72 in an oblique direction by being inclined with respect to the cooling surface. However, the nozzle-type ventilation duct outlet 102 is parallel even if it is perpendicular to the cooling surface. Or may be inclined. That is, the angle of the nozzle-type ventilation duct outlet 102 may be different from the angle of the nozzle-type ventilation duct 101, and the angle may be variable.

  Since the nozzle-type ventilation duct outlet 102 of the nozzle-type ventilation duct 101 protrudes into the free space, the air around the nozzle-type ventilation duct outlet 102 can be entrained to increase the air volume to the cooling surface. .

  The nozzle-type ventilation duct 101 and the nozzle-type ventilation duct outlet 102 are reduced in temperature with respect to the incident-side polarizing plate 7a, the emitting-side polarizing plate 7b, and the liquid crystal panel 6 for R light, G light, and B light, respectively. What is necessary is just to install with respect to required components, and combined use with the above-mentioned general parallel flow cooling may be sufficient. For example, as shown in FIG. 7, cooling using the nozzle-type ventilation duct 101 may be employed only for cooling the light incident surface side of the incident-side polarizing plate 7a, and parallel flow cooling may be employed for the remaining components. .

  The nozzle-type ventilation duct 101 and the nozzle-type ventilation duct outlet 102 may be shaped to guide the cooling air 72 from any direction to the incident side polarizing plate 7 a, the outgoing side polarizing plate 7 b, and the liquid crystal panel 6. For example, although FIG. 7 is from the bottom, as shown in FIG. 8, a nozzle-type ventilation duct 101 used for cooling the light incident surface side of the incident polarizing plate may be introduced from the side surface of the incident polarizing plate. Of course, it does not matter from diagonally or from the top.

  The cooling air 72 supplied from the nozzle-type ventilation duct 101 may be supplied by providing a panel cooling fan 70 separately, or shared with at least one of the B panel cooling fan 70a and the RG panel RG panel cooling fan 70b. You may supply in the form to do.

  FIG. 9 shows a simulation diagram of a test system for confirming the effect of the present embodiment. While changing the inclination angle θ of the nozzle-type ventilation duct 101, the transition of the center temperature of the heat generating component 500 was confirmed. The input power to the heat generating component 500 and the supply conditions of the cooling air 72 were the same. In addition, the distance between the nozzle-type ventilation duct outlet 102 of the nozzle-type ventilation duct 101 and the central portion of the heat generating component 500 is constant.

  FIG. 10 shows the transition of the temperature at the center of the heat generating component 500 when the inclination angle of the nozzle type ventilation duct 101 as the test result of FIG. 9 is changed. From FIG. 10, by changing the angle of the nozzle-type ventilation duct 101, the above-described general parallel flow cooling (the nozzle-type ventilation duct installation angle θ in FIG. 10 is 0 degree: 56.8 ° C.). Further, it can be seen that the temperature of the parts is lowered. Specifically, the nozzle-type ventilation duct installation angle θ is 50.0 ° C. at 20 degrees, 48.3 ° C. at 40 degrees, and 46.8 ° C. at 60 degrees, respectively. That is, if the nozzle-type ventilation duct installation angle θ is 20 ° or more, the temperature of the heat generating component 500 can be lowered by 5 ° C. or more. From this, it can be said that the cooling efficiency can be improved by installing the nozzle-type ventilation duct 101 in an oblique direction with respect to the component surface.

  Next, a second embodiment of the present invention in the liquid crystal projector 1 will be described. FIG. 11 is a cross-sectional view illustrating the configuration of the second embodiment. Here, for easier understanding, the polarizing plate and the liquid crystal panel on which R light and B light are incident are not shown, and only the G optical path cross section at the same position as the AA cross section in FIG. 4 is shown.

  In the first embodiment of the present invention described above, the incident side polarizing plate 7a, the outgoing side polarizing plate 7b, and the liquid crystal panel 6 are cooled by the cooling air 72 as separate components. However, when the liquid crystal projector 1 itself is further reduced in size, the interval between the components of the incident side polarizing plate 7a, the outgoing side polarizing plate 7b, and the liquid crystal panel 6 is reduced, and the space for inserting the nozzle type ventilation duct 101 is reduced. Further, when the interval between the parts is reduced, the pressure loss increases, so the flow rate of the cooling air from the fan decreases, the cooling efficiency further decreases, and the reliability decreases due to the temperature rise. In order to cope with the increase in pressure loss, it is sufficient to increase the number of rotations of the fan.

  Therefore, in the second embodiment, the incident polarizing plate glass substrate 7ab used as the polarizing film holding member of the incident-side polarizing plate 7a is removed, and the surface of the liquid crystal panel 6 is regarded as a substrate (plate-shaped holding member). The plate polarizing film 7aa is integrated with the liquid crystal panel 6. That is, the liquid crystal panel surface is regarded as a glass substrate of a polarizing plate, and a single component having a polarizing film attached to the liquid crystal panel surface is cooled. That is, the polarizing film is structured to be held by the liquid crystal panel. Even in this case, although the heat transfer area of the incident side polarizing plate 7a and the liquid crystal panel 6 is reduced, the interval between components (for example, the interval between the condenser lens 411 and the liquid crystal panel 6G) is widened, so that the nozzle type ventilation duct is used. A sufficient space for inserting 101 (an example of free space) can be secured.

  Further, in FIG. 11, the incident side surface and the exit side surface of the liquid crystal panel 6G have a structure that can be cooled by separate cooling fans, and when cooled by separate cooling fans, the liquid crystal panel 6G is cooled better. be able to.

  The combination of the polarizing plate polarizing film 7aa integrated with the nozzle-type ventilation duct 101 and the liquid crystal panel 6 is used for cooling at least one of the optical paths of R light, G light, and B light. Of course, the optical paths of R light, G light, and B light may be used for cooling two optical paths and further cooling three optical paths.

  In Example 2, the surface of the liquid crystal panel 6 is regarded as a substrate, and the incident polarizing plate polarizing film 7aa is integrated with the liquid crystal panel 6, and the incident polarizing plate polarizing film 7aa of the incident side polarizing plate 7a is attached to the liquid crystal panel 6. The output polarizing plate 7 a of the output side polarizing plate 7 b may be attached to the liquid crystal panel 6. Further, both the polarizing films 7aa and 7ba may be attached to the liquid crystal panel 6 at the same time.

  Further, in this case, the incident polarizing plate glass substrate 7ab used as the holding member for the polarizing films 7aa and 7ba is not necessary, so that the internal structure of the liquid crystal projector can be rationalized, and the cost and occupied space can be reduced.

  7 and 11, the nozzle-type ventilation duct 101 is inclined with respect to the light passage surface of one or both of the polarizing film and the liquid crystal panel, and has at least one outlet surface that protrudes into free space. It is an example of the nozzle type duct which supplies cooling air to a film | membrane and a liquid crystal panel. That is, in FIG. 7, a nozzle-type ventilation duct 101 is a nozzle-type duct that supplies cooling air to a polarizing plate including a polarizing film and a substrate. FIG. 11 shows a nozzle-type duct that supplies cooling air to a structure in which a polarizing film and a liquid crystal panel are integrated. In addition, the nozzle type duct that supplies cooling air has a plurality of air outlet surfaces in which one duct protrudes into free space, and the cooling air is supplied to one or both of the polarizing film and the liquid crystal panel. You may supply. A plurality of ducts may have one or a plurality of air outlet surfaces protruding into a free space, and cooling air may be supplied to a plurality of portions of one or both of the polarizing film and the liquid crystal panel. In this case, the temperature at a plurality of locations can be cooled more precisely.

  In the first embodiment, the configuration in which the nozzle type duct is added to the general cooling structure has been described. In the second embodiment, the configuration in which the nozzle duct is added to the structure in which the surface of the liquid crystal panel is regarded as a substrate and the polarizing film is integrated with the liquid crystal panel has been described. In addition, the structure can be streamlined by using a common cooling fan and a fan that is used for the ventilation of the nozzle duct to streamline the structure, or separate fans can be used. Powerful cooling may be performed by stronger ventilation. In this case, the projector apparatus may be reduced in size by making the cooling capacity constant and distributing small capacity fans in place of strong cooling. Further, the cooling structure by a general outlet may be omitted, and cooling by only the nozzle duct may be performed.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function can be stored in a recording device such as a memory, a hard disk, an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

  In addition, wirings such as control lines and information lines are those that are considered necessary for the explanation, and not all control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

DESCRIPTION OF SYMBOLS 1 Liquid crystal projector 2 Power supply unit 3 Light source unit 3a Lamp 3b Lamp reflector 3c Lamp lens 4 Optical unit 5 Prism unit 6 Liquid crystal panel 7a Incident side polarizing plate 7b Outgoing side polarizing plate 7aa Incident polarizing plate polarizing film 7ab Incident polarizing plate glass substrate 7ba Outgoing polarizing plate Plate polarizing film 7bb Exit polarizing plate glass substrate 8 Photosynthesis prism 9 Projection lens 9a Projection lens entrance 9b Projection lens exit 10 Cooling fan 11 Dustproof filter 70 Panel cooling fan 70a B panel cooling fan 70b RG panel cooling fan 71 Ventilation duct 71a Ventilation duct Intake port 71b Ventilation duct discharge port 72 Cooling air 80 Drive substrate 81 Liquid crystal panel-drive substrate connection flexible 101 Nozzle type ventilation duct 102 Nozzle type ventilation duct outlets 401, 402 Lee 403 polarization conversion element 404 a condenser lens 405, 406 and 407 reflecting mirrors 408 and 409 dichroic mirrors 410, 411, 412 a condenser lens 413 first relay lens 414 second relay lens 500 heat generating component

Claims (6)

Cooling air is supplied to the light source, the polarizing film disposed on the optical path of the light from the light source, the liquid crystal panel, the polarizing film for dissipating heat from the polarizing film and the liquid crystal panel, and the liquid crystal panel. A fan, a drive circuit that drives the fan, a duct that guides the cooling air to the polarizing film and the liquid crystal panel, a light combining prism that combines light passing through the polarizing plate and the liquid crystal panel, and combined light And a projection lens disposed on the optical path of
The polarizing film and the liquid crystal panel are provided with at least one outlet surface that is inclined with respect to a light passage surface of either the polarizing film or the liquid crystal panel and protrudes into a free space. A liquid crystal projector comprising a nozzle-type duct for supplying. The liquid crystal projector according to claim 1,
2. A liquid crystal projector according to claim 1, wherein said nozzle type duct has a blow-out port cross-sectional area narrower at a tip portion than an in-tube cross-sectional area of said duct. The liquid crystal projector according to claim 1 or 2,
The liquid crystal projector, wherein the polarizing film is held by a plate-like holding member that holds the polarizing film. The liquid crystal projector according to claim 1 or 2,
The liquid crystal projector, wherein the polarizing film has a structure held by the liquid crystal panel. The liquid crystal projector according to claim 1,
Having a condenser lens on the light source side of the polarizing film;
A liquid crystal projector, wherein cooling air blows out from a nozzle-type duct that supplies the cooling air to a space between the polarizing film and the condenser lens. The liquid crystal projector according to claim 1,
A liquid crystal projector, wherein an incident side surface and an output side surface of a liquid crystal panel are cooled by separate cooling fans.