JP2013145259A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector that prevents dust and dirt from being deposited on a light modulation device and suppresses color unevenness of a projection image with a simple configuration.SOLUTION: A projector 1 includes a light modulation device (liquid crystal panel 342) for modulating light flux, a duct 6 that makes the cooling air for cooling the liquid crystal panel 342 flow and has a discharge port 63 discharging the flowed cooling air, and a guide member 7 that surrounds an area from the discharge port 63 to the liquid crystal panel 342 and part of lateral face of the liquid crystal panel 342, thereby suppressing catch of dust and dirt to make the cooling air flow.

Description

  The present invention relates to a projector.

  Conventionally, a light modulation device, an incident-side polarizing plate, and an emission-side polarizing plate provided in a projector generate heat by a light beam emitted from a light source. The cooling mechanism provided inside the projector takes outside air from the outside of the projector, blows the taken outside air onto the light modulator, the incident side polarizing plate and the emitting side polarizing plate, and allows the temperature of these optical components to be allowed. Cooling to be within the temperature range.

  FIG. 5 is a schematic schematic plan view showing the cooling mechanism 80 and the electro-optical device 34 of the conventional projector 10. Further, in FIG. 5, the discharge port 82 of the duct 81 corresponding to the light modulation device (liquid crystal panel 342) located at the center is illustrated in cross section. The electro-optical device 34 includes a cross dichroic prism (not shown), a liquid crystal panel 342 installed for each color light on three adjacent side surfaces of the cross dichroic prism (not shown), and an exit side polarizing plate (not shown). ing. Note that the incident-side polarizing plate installed in the front stage of the liquid crystal panel 342 as the electro-optical device 34 is not shown. The cooling mechanism 80 includes a duct 81 that flows outside air and a fan (not shown) that sucks outside air. In addition, the discharge port 82 is installed so that it may be located under the incident side polarizing plate, the liquid crystal panel 342, and the emission side polarizing plate for each color light.

  When the fan is driven, the cooling mechanism 80 allows outside air to be ducted through a filter (not shown) that prevents dust from entering from an opening (not shown) installed in an exterior housing (not shown) of the projector 10. It flows into 81 inflow ports (not shown). The outside air flows in the duct 81 and is discharged from the discharge port 82 provided for each color light. The outside air (cooling air W) discharged from the discharge port 82 flows upward. Thereby, the discharged cooling air W is blown to the incident side polarizing plate, the liquid crystal panel 342 and the emission side polarizing plate 343 that are located above, and flows along the surface and the side surface. The liquid crystal panel 342 and the emission side polarizing plate 343 are cooled.

  As shown in FIG. 5, the cooling air W discharged upward from the discharge port 82 flows in the duct 81 reaching the discharge port 82 from the right to the left in the drawing, and is discharged from the discharge port 82. Afterwards, it flows in the left direction. Therefore, in order to discharge cooling air to the center of the liquid crystal panel 342, the discharge port 82 is arranged to be shifted to the right in the drawing with respect to the center of the liquid crystal panel 342. Further, when the cooling air W is discharged, the surrounding air is attracted to the cooling air W so that the surrounding air is attracted by the negative pressure around the cooling air W.

  In the surrounding air, the above-mentioned fan provided in the projector 10, the exhaust fan (not shown), and the like operate, so that a gap (for example, a projection lens (not shown)) exits from the exterior housing. ) Etc., dust DS entering with the outside air has been caught. Note that the direction in which the dust DS is involved is schematically indicated by arrows D3 and D4 in the drawing. And since the wind speed of the entrained dust DS is low, for example, it easily adheres to the surface (region E etc.) on which the light flux of the liquid crystal panel 342 enters. When the dust DS adheres to the liquid crystal panel 342, shadows and color unevenness of the dust DS are generated in the projected image, and the quality of the projected image is deteriorated.

  In Patent Document 1, the cooling air blown upward from the two cooling air outlets at the lower portion of the air cooling space is arranged in an approximately L shape corresponding to the mutually orthogonal side surfaces of the cross prism in the air cooling space. Main air guides that are guided to be raised along the surfaces of the two sets of light valve units arranged in a substantially L shape along the side surfaces of the two sets of light valve units, and It is disclosed that the corner portion is provided so as to stand upward from the bottom portion so as to cover the side surface of the light valve unit from the bottom portion of the air cooling space portion. Patent Document 1 discloses that a filter holder is installed on the upper part of the main air guide, and that the filter holder has a cooling air outlet that is disposed immediately above the cooling air outlet. Yes.

  With this optical unit device, the cooling air blown upward from the cooling air outlet can be smoothly raised along the surface of the light valve unit, and after being raised, from the cooling air outlet of the filter holder, the optical unit Since it can be smoothly discharged above the case, turbulent flow of cooling air does not occur in the air cooling space. In particular, it is possible to prevent the occurrence of turbulent flow with a large amount of cooling air vortex in the corner portion of the air cooling space. Therefore, it is possible to prevent fine dust from adhering to the light valve unit, which is caused by the generation of turbulent flow with a large amount of cooling air vortex, and to cause adverse effects such as color disturbance in the projected image. Therefore, it is possible to realize a high-quality projection display device that can project a high-quality projected image.

JP 2006-126863 A

The optical unit device of Patent Document 1 induces the cooling air blown from the cooling air outlet of the light valve unit mounting portion by the main air guide and raises it along the surface of the light valve unit or the like, thereby cooling the filter holder. Generation of turbulent flow is prevented by discharging from the discharge port to above the optical unit case. Thus, the optical unit device prevents dust mixed in the cooling air itself from adhering to the light valve unit (light modulation device). However, the optical unit device including the main air blowing guide and the filter holder has a complicated configuration, and when each member is assembled, a gap or the like is likely to be generated, and dust enters the air cooling space from the gap. Can be considered. In addition, the space part for air cooling is enclosed in the main ventilation guide and the filter holder, and is a substantially closed space. Accordingly, it is conceivable that the dust that has entered the air cooling space cannot be smoothly discharged from the cooling air discharge port, and the dust remains in the air cooling space. In addition, there is a concern that the optical unit device having such a complicated configuration is increased in size. Further, the conventional cooling mechanism 80 has a simple configuration, but is not suitable for reducing the entrainment of dust DS by the cooling air W.
Accordingly, there has been a demand for a projector that reduces the adhesion of dust to the light modulation device with a simple configuration and suppresses color unevenness in the projected image.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example is a projector that modulates and projects a light beam emitted from a light source according to image information, and includes a light modulation device that modulates the light beam and cooling that cools the light modulation device. A duct having a discharge port for discharging wind; and a guide member for suppressing the entrainment of dust and flowing cooling air between the discharge port and the light modulation device and by surrounding a part of the side surface of the light modulation device. It is characterized by providing.

  According to such a projector, the guide member encloses the space between the discharge port of the duct and the light modulation device, and surrounds a part of the side surface of the light modulation device, thereby suppressing the entrainment of dust and cooling air. Let it flow. With such a simple configuration, when cooling air is discharged from the discharge port, dust in the area surrounded by the guide member is discharged together with the cooling air, thereby reducing the adhesion of dust to the light modulation device. Can do. In addition, since dust in a region not surrounded by the guide member flows along the guide member, it is possible to suppress the entrainment of dust and reduce the adhesion of dust to the light modulation device. Therefore, color unevenness in the projected image can be suppressed, and the projected image quality can be maintained.

  Application Example 2 In the projector according to the application example described above, the center line passing through the center in the horizontal direction of the discharge port with respect to the center line passing through the center in the horizontal direction of the light incident surface of the light modulation device is It is preferable that the cooling air is shifted upstream in the flow direction.

  The center line passing through the horizontal center of the discharge port is shifted to the upstream side in the flow direction of the cooling air in the duct with respect to the center line passing through the horizontal center of the light incident surface of the light modulator. Thus, the cooling air can be flowed to the center of the light modulation device to increase the cooling efficiency. However, since the flow rate of the cooling air is reduced on a part of the incident surface, dust is more likely to adhere to the incident surface. Therefore, the effect of suppressing adhesion of dust when the guide member is disposed is increased.

  Application Example 3 In the projector according to the application example described above, it is preferable that the guide member is arranged upstream of the center of the incident surface in the flow direction of the cooling air.

  According to such a projector, by arranging the guide member so as to be upstream in the flow direction of the cooling air from the center of the incident surface, the cooling air flowing in an inclined manner is not blocked by the guide member. In addition, since it is possible to reduce the adhesion of dust to the light modulation device without reducing the cooling efficiency to the light modulation device, color unevenness in the projected image can be suppressed.

  Application Example 4 In the projector according to the application example described above, it is preferable that the guide member is provided according to the number of light modulation devices and is integrally formed.

  According to such a projector, by providing guide members according to the number of light modulation devices, it is possible to reduce the adhesion of dust to each light modulation device, and the guide members provided respectively are integrally formed. Thus, the guide member can be easily handled and the number of assembling steps can be reduced.

FIG. 2 is a diagram schematically illustrating a schematic configuration of a projector according to an embodiment. FIG. 3 is an assembly diagram of an electro-optical device and a cooling mechanism. The perspective view which assembled the electro-optical device and the cooling mechanism. FIG. 3 is a schematic plan view showing a cooling mechanism and an electro-optical device. FIG. 6 is a schematic plan view showing a conventional projector cooling mechanism and electro-optical device.

Hereinafter, embodiments will be described with reference to the drawings.
(Embodiment)

  FIG. 1 is a diagram schematically illustrating a schematic configuration of a projector 1 according to the embodiment. With reference to FIG. 1, a schematic configuration of a projector 1 according to the present embodiment will be described. The projector 1 according to the present embodiment is a device that modulates a light beam emitted from the light source device 30 (light source 301) according to image information and enlarges and projects it on a projection surface such as a screen (not shown).

  In the subsequent drawings including FIG. 1, the dimensions and ratios of the respective constituent elements are shown as appropriately different from the actual ones in order to make the respective constituent elements large enough to be recognized on the drawing. Further, in the subsequent drawings including FIG. 1, for convenience of explanation, it is described in an XYZ orthogonal coordinate system. In the XYZ orthogonal coordinate system, the traveling direction of the light beam emitted from the light source device 30 along the illumination optical axis OA is defined as the Y direction (+ Y direction). In addition, the direction in which the modulated light is projected in a stationary posture that is orthogonal to the Y direction in the horizontal direction is defined as an X direction (+ X direction). Furthermore, it is orthogonal to the X direction and the Y direction, and the upward direction in the stationary posture is defined as the Z direction (+ Z direction).

  As shown in FIG. 1, the projector 1 includes an optical unit 3, a control unit (not shown), a power supply unit (not shown) that supplies power to the control unit, and a cooling mechanism 5 that cools the inside of the projector 1 (FIG. 2). These devices are housed inside the exterior housing 2. The cooling mechanism 5 will be described later.

  The optical unit 3 is a unit that modulates and projects the light beam emitted from the light source device 30 based on control by the control unit. The optical unit 3 houses the light source device 30, the illumination optical device 31, the color separation optical device 32, the relay optical device 33, the electro-optical device 34, and these optical devices 30 to 34, and the projection lens 35 at a predetermined position. And an optical component housing 36 that is supported and fixed by

  The light source device 30 includes a light source 301 and a reflector 302. The light source device 30 aligns the emission direction of the light beam emitted from the light source 301 by the reflector 302, makes it parallel to the illumination optical axis OA, and emits it toward the illumination optical device 31. The illumination optical axis OA is the central axis of the light beam emitted from the light source device 30 toward the illuminated area. The light source device 30 of this embodiment employs an ultrahigh pressure mercury lamp.

  The illumination optical device 31 includes a first lens array 311, a second lens array 312, a polarization conversion element 313, a superimposing lens 314, and a collimating lens 315. The first lens array 311 splits the light beam emitted from the light source device 30 into partial light beams, and emits them in the direction along the illumination optical axis OA. The second lens array 312 emits the partial light beams emitted from the first lens array 311 toward the superimposing lens 314, respectively.

  The polarization conversion element 313 has a function of aligning each partial light beam, which is a randomly polarized light emitted from the second lens array 312, with approximately one type of polarized light that can be used in the liquid crystal panel 342. Each partial light beam emitted from the second lens array 312 and converted into substantially one type of polarized light by the polarization conversion element 313 is substantially superimposed on the surface of the liquid crystal panel 342 by the superimposing lens 314. Note that the light beam emitted from the superimposing lens 314 is collimated by the collimating lens 315 and superimposed on the liquid crystal panel 342. In detail, the collimating lens 315 is provided for each of three color lights described later.

  The color separation optical device 32 includes a first dichroic mirror 321, a second dichroic mirror 322, and a reflection mirror 323. The color separation optical device 32 separates the light beam emitted from the illumination optical device 31 into three color lights of red (R) light, green (G) light, and blue (B) light.

  The relay optical device 33 includes an incident side lens 331, a relay lens 333, and reflection mirrors 332 and 334. The relay optical device 33 guides the R light separated by the color separation optical device 32 to the liquid crystal panel 342R for R light. In the present embodiment, the relay optical device 33 is configured to guide the R light. However, the present invention is not limited to this. For example, the relay optical device 33 may be configured to guide the B light.

  The electro-optical device 34 includes three incident-side polarizing plates 341, three liquid crystal panels 342 as light modulation devices, three emission-side polarizing plates 343, and one cross dichroic prism 345. For the three incident-side polarizing plates 341, the R-light incident-side polarizing plate is 341R, the G-light incident-side polarizing plate is 341G, and the B-light incident-side polarizing plate is 341B. Further, for the three liquid crystal panels 342, the liquid crystal panel for R light is 342R, the liquid crystal panel for G light is 342G, and the liquid crystal panel for B light is 342B. For the three exit-side polarizing plates 343, the exit-side polarizing plate for R light is 343R, the exit-side polarizing plate for G light is 343G, and the exit-side polarizing plate for B light is 343B.

  The liquid crystal panel 342 (342R, 342G, 342B) modulates the light beam separated for each color light by the color separation optical device 32 according to image information. The cross dichroic prism 345 has a substantially square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. The cross dichroic prism 345 synthesizes the color lights modulated by the liquid crystal panels 342R, 342G, and 342B and emits them to the projection lens 35.

  The projection lens 35 is composed of a combined lens in which a plurality of lenses are combined, and enlarges and projects the light beam modulated and synthesized by the electro-optical device 34 onto a projection surface such as a screen.

  FIG. 2 is an assembly diagram of the electro-optical device 34 and the cooling mechanism 5 of the present embodiment. FIG. 3 is a perspective view in which the electro-optical device 34 and the cooling mechanism 5 are assembled. The configuration of the cooling mechanism 5 will be described with reference to FIGS.

  A plurality of cooling mechanisms are provided inside the projector 1 to cool the heat generating optical components (the light source device 30, the polarization conversion element 313, the electro-optical device 34, etc.), the heat generating circuit elements, and the like. The cooling mechanism is provided with a fan and a duct (both not shown), and cools by blowing outside air outside the projector 1 and blowing it onto a component that generates heat. In addition, the heated outside air is cooled and exhausted to the outside of the projector 1.

  First, the electro-optical device 34 of the present embodiment includes a cross dichroic prism 345 and a liquid crystal panel 342 as a light modulation device that is installed for each color light on three side surfaces of the cross dichroic prism 345 that are orthogonal and adjacent to each other. , And an exit side polarizing plate 343.

  Specifically, the liquid crystal panel 342 is housed in the housing frame 342A, and the exit-side polarizing plate 343 is attached to the glass substrate 343A. As described above, the liquid crystal panel 342 housed in the housing frame 342A and the exit-side polarizing plate 343 attached to the glass substrate 343A are supported by the support frame 344, and are side surfaces of the cross dichroic prism 345 corresponding to each color light. It is fixed to.

  The electro-optical device 34 also includes an incident-side polarizing plate 341, which is omitted in FIGS. The incident side polarizing plate 341 is not supported by the cross dichroic prism 345 but is supported by the optical component housing 36. The incident-side polarizing plate 341 is supported in a state of being attached to the glass substrate 343A, similarly to the emission-side polarizing plate 343. In addition, the incident-side polarizing plate 341 is installed in front of each liquid crystal panel 342 shown in FIG. 3 so as to be surrounded by a guide body 71 and a guide wall 73 of the guide member 7 described later, like the liquid crystal panel 342. The

  The cooling mechanism 5 of the present embodiment is a mechanism that cools the electro-optical device 34. The cooling mechanism 5 includes a cooling fan (not shown), a duct 6, a guide member 7, and the like.

  The duct 6 includes an inflow port 62 into which outside air (cooling air) flows, a duct body 61 that flows the cooling air that flows in from the inflow port 62, and a discharge port 63 that discharges the cooling air that flows through the duct body 61. Configured.

  The duct body 61 includes two parts, a first duct body 611 having an inlet 621 and a second duct body 612 having an inlet 622. The duct main body 61 (the first duct main body 611 and the second duct main body 612) is installed on the bottom surface (not shown) of the exterior casing 2 so that the bottom surfaces of the first duct main body 611 and the second duct main body 612 It is comprised and functions as the duct main body 61.

The configuration of the previous stage of the inlet 62 of the duct body 61 will be described.
2 and 3, illustration of the cooling fan, the filter, the optical component housing 36, and the like is omitted. An opening (not shown) is installed in the exterior housing 2, and a filter that prevents dust from entering the duct 6 is installed in the opening. A cooling fan is installed at the rear stage of the filter, and the first duct body 611 and the second duct body 612 are connected to a discharge port (not shown) of the cooling fan. In detail, two cooling fans are used, and the inlet 621 of the first duct body 611 and the inlet 622 of the second duct body 612 are connected to the respective discharge ports. The cooling fan of this embodiment uses a sirocco fan as a centrifugal fan.

  The discharge ports 63 constituting the duct 6 are installed for each color light. The discharge port 63 includes three discharge ports 63 including a discharge port 63G for G light, a discharge port 63B for B light, and a discharge port 63R for R light. Further, the G light discharge port 63 </ b> G is connected to the first duct body 611. The B light discharge port 63 </ b> B and the R light discharge port 63 </ b> R are connected to the second duct body 612.

  The three discharge ports 63 are opened upward (+ Z direction) and are positioned below the incident side polarizing plate 341, the liquid crystal panel 342, and the emission side polarizing plate 343 installed for each color light. The cooling air that has flowed through the first duct body 611 is discharged upward (+ Z direction) from the discharge port 63G. A part of the cooling air flowing in the second duct main body 612 is discharged upward (+ Z direction) from the discharge port 63B, and the rest is discharged upward (+ Z direction) from the discharge port 63R.

  Further, the discharge ports 63G, 63B, and 63R are divided corresponding to the incident side polarizing plate 341, the liquid crystal panel 342, and the emission side polarizing plate 343, and the cooling air discharged from the discharge ports 63G, 63B, and 63R is approximately. As rectification, it flows on the surfaces of the incident side polarizing plate 341, the liquid crystal panel 342, and the emission side polarizing plate 343. Specifically, the discharge port 63G is divided into two, and the discharge ports 63B and 63R are divided into three. Note that the positions and the number of divisions of the discharge ports 63 take into account differences in the amount of heat generated by the incident-side polarizing plate 341, the liquid crystal panel 342, and the emission-side polarizing plate 343 for each color light so that efficient cooling is possible. I have decided.

  The guide member 7 causes the cooling air discharged from the discharge port 63 to flow to the liquid crystal panel 342 or the like without entraining dust from a region not surrounded by the guide member 7. The guide member 7 is installed between the electro-optical device 34 and the duct 6 (discharge port 63). Specifically, the guide member 7 is formed so as to surround a space from the discharge port 63 to a position where the incident side polarizing plate 341, the liquid crystal panel 342, and the emission side polarizing plate 343 to be cooled are installed.

  The guide member 7 generally includes a guide body 71 that surrounds the discharge port 63, an opening 72 that opens in a shape along the outer shape of each discharge port 63, and the outer sides of the guide body 71 in both lateral directions of each opening 72. The guide wall 73 is formed.

  The guide body 71 has a substantially T shape when viewed from above, and is formed so as to surround the three discharge ports 63. The guide main body 71 is formed with an opening 72 that opens in a shape along the outer shape of the discharge port 63.

  Specifically, an opening 72G for G light is formed along the outer shape of the discharge port 63G for G light, and an opening 72B for B light is formed along the outer shape of the discharge port 63B for B light, An opening 72R for R light is formed along the outer shape of the discharge port 63R for R light. The openings 72G, 72B, 72R are formed so as to be fitted into the corresponding discharge ports 63G, 63B, 63R without any gaps.

  In addition, an opening 74 through which a fixing plate 34A (see FIG. 4) for fixing the cross dichroic prism 345 of the electro-optical device 34 is inserted is formed at the center of the guide body 71.

  A guide wall 73 protruding upward (+ Z direction) is formed on the outer side of the guide body 71 in both lateral directions of the openings 72G, 72B, 72R. The guide wall 73 is connected to the guide body 71 and surrounds the incident side polarizing plate 341, the liquid crystal panel 342, and the emission side polarizing plate 343, and the incident side polarizing plate 341, the liquid crystal panel 342, and the emission side polarizing plate 343. It is formed so as to enclose a part of the side surface.

  Specifically, the guide wall 73 includes four guide walls 731, 732, 733, and 734. The guide wall 731 includes a G light liquid crystal panel 342G (including an incident side polarizing plate 341G and an emission side polarizing plate 343G) and an R light liquid crystal panel 342R (including an incident side polarizing plate 341R and an emission side polarizing plate 343R). ) And is placed so as to surround a part of the side. The guide wall 732 includes a G light liquid crystal panel 342G (including an incident side polarizing plate 341G and an emission side polarizing plate 343G) and a B light liquid crystal panel 342B (incident side polarizing plate 341B and an emission side polarizing plate 343B). It is installed so as to surround a part of the side surface. The height of the guide wall 73 is set so that the guide wall 73 is on the lower side (−Z direction) than the center portion C1.

  Further, the guide wall 733 is installed so as to surround a part of the side surface of the liquid crystal panel 342B for B light (including the incident side polarizing plate 341B and the emission side polarizing plate 343B). The guide wall 734 is installed so as to surround a part of the side surface of the liquid crystal panel 342R for R light (including the incident-side polarizing plate 341R and the emission-side polarizing plate 343R).

Here, the assembly of the cooling mechanism 5 (the duct 6 and the guide member 7) and the electro-optical device 34 will be described.
First, the duct 6 is installed at a predetermined position of the exterior casing 2. Thereby, the discharge port of the cooling fan (not shown) and the inlet 62 of the duct 6 are connected. Thereafter, the guide member 7 is installed in the duct 6. Specifically, the guide member 7 is installed by fitting the opening 72 of the guide member 7 into the corresponding discharge port 63. Thereafter, the optical component housing 36 on which the incident-side polarizing plate 341 is installed is installed at a predetermined position of the exterior housing 2. Then, the fixing plate 34 </ b> A of the electro-optical device 34 is inserted into the opening 74 of the guide member 7 and installed on a fixing frame (not shown) that fixes the projection lens 35. This assembly results in the state shown in FIG.

  As shown in FIG. 3, when the cooling mechanism 5 and the electro-optical device 34 are assembled, the guide member 7 surrounds the outer shape of the discharge port 63 of the duct 6 by the guide main body 71. The guide member 7 is connected between the discharge port 63 and the electro-optical device 34 (incident side polarizing plate 341, liquid crystal panel 342, emission side polarizing plate 343) by the guide wall 73 connected to the guide main body 71, and the incident side. The lower side (−Z direction) is surrounded from the central portion C1 of the side surfaces of the polarizing plate 341, the liquid crystal panel 342, and the emission side polarizing plate 343. As described above, the incident-side polarizing plate 341 (not shown) is installed in a region surrounded by the guide main body 71 and the guide wall 73 in front of each liquid crystal panel 342 in FIG.

  FIG. 4 is a schematic plan view showing the cooling mechanism 5 and the electro-optical device 34. In FIG. 4, the G light liquid crystal panel 342 </ b> G is shown as viewed from the front. Further, in FIG. 4, a discharge port 63G corresponding to the liquid crystal panel 342G and a part of the guide member 7 (guide body 71, guide walls 731 and 732) are illustrated in cross section (indicated by hatching). Also in FIG. 4, the optical component housing 36 is not shown. With reference to FIG. 4, the flow of the cooling air will be described.

  Hereinafter, for convenience of explanation, the case where the cooling air G1 is discharged from the G light discharge port 63G to the liquid crystal panel 342G for G light will be described. FIG. 4 schematically illustrates the cooling air G1 discharged from the discharge port 63G and the flow direction of the dust DS caused by the discharged cooling air G1.

  As shown in FIG. 4, when the discharge port 63G and the liquid crystal panel 342G of the present embodiment are viewed from the light beam incident side (−X direction), the center line A1 in the horizontal direction (Y direction) of the discharge port 63G; The light flux incident surface 3421G of the liquid crystal panel 342G deviates from the center line A2 in the horizontal direction (Y direction). Specifically, the center line A1 of the discharge port 63G is shifted to the right (−Y direction) from the center line A2 of the liquid crystal panel 342G on the upstream side of the cooling air G1 flowing in the duct 6.

  As shown in FIG. 4, in the present embodiment, the cooling air G <b> 1 flowing in from the inlet 621 (see FIG. 2) moves from the right direction (−Y direction) to the left direction (+ Y direction) in the first duct body 611. To flow. Therefore, even if the flow of the cooling air G1 is changed to the vertical direction (upward) by the discharge port 63G and discharged from the discharge port 63G, the discharged cooling air G1 has an influence on the flow direction of the first duct body 611. Accordingly, it does not flow parallel to the vertical direction (+ Z direction) but flows so as to incline in the left direction (+ Y direction) as shown in the figure.

  Therefore, in the present embodiment, even if the cooling air G1 flows in the inclined direction, the liquid crystal panel 342G flows through the central portion C1 where the amount of heat generated is the highest, so the center line A1 of the discharge port 63G is connected to the liquid crystal panel. The position of the discharge port 63G is adjusted so as to shift to the upstream side of the cooling air G1 flowing in the duct 6 with respect to the center line A2 of 342G.

  Due to the arrangement of the discharge ports 63G, the cooling air G1 flows reliably to the central portion C1 of the liquid crystal panel 342G, and is efficiently cooled so that the temperature of the liquid crystal panel 342G falls within the allowable temperature range. At the same time, the cooling air G1 also flows to the incident side polarizing plate 341G and the exit side polarizing plate 343G, and efficiently cools so that the temperatures of the incident side polarizing plate 341G and the exit side polarizing plate 343G are within the allowable temperature range. Let In such an arrangement, since the cooling air G1 flows with an inclination, the upper right and the lower left of the light incident surface 3421G of the liquid crystal panel 342G have a small flow rate of the cooling air. When air (air in a region not surrounded by the guide member 7) is attracted, dust tends to adhere to the upper right and lower left of the light flux incident surface 3421G.

  In this embodiment, even if the cooling air G1 discharged from the discharge port 63G flows into the liquid crystal panel 342G, it is surrounded by the guide member 7 (the guide main body 71 and the guide walls 731 and 732), so that the periphery of the discharge port 63G. The air stays in a region outside the guide member 7 (the guide main body 71 and the guide walls 731 and 732). Thereby, the guide member 7 suppresses that the dust DS in a region not surrounded by the guide member 7 adheres to the surface on which the light flux of the liquid crystal panel 342G is incident.

  Further, the height of the guide wall 73 is set so that the guide wall 73 is on the lower side (−Z direction) upstream of the cooling air G1 from the center portion C1, and therefore the left direction (+ Y direction). The cooling air G1 that flows so as to incline is not blocked by the guide wall 73, and the cooling air G1 can flow to the upper left of the liquid crystal panel 342G. Therefore, the dust DS is prevented from adhering to the surface on which the light flux of the liquid crystal panel 342G is incident without reducing the cooling efficiency.

  In the above description, the case where the cooling air G1 is discharged from the G light discharge port 63G to the G light liquid crystal panel 342G has been described, but this is because the G light incident side polarizing plate 341G, The same applies to the exit-side polarizing plate 343G.

  Further, the discharge port 63B for B light and the discharge port 63R for R light have a center in the X direction of the discharge ports 63B and 63R with respect to the liquid crystal panel 342B and the liquid crystal panel 342R, and the center in the X direction of the liquid crystal panels 342B and 342R. It is installed so as to be approximately the same. This is because the flow direction of the cooling air flowing through the second duct main body 612 is substantially perpendicular to the light flux incident surfaces of the liquid crystal panels 342B and 342R. However, the guide member 7 (the guide main body 71, the guide walls 732, 733) surrounds the entrance side polarizing plates 341B, 341R, the liquid crystal panels 342B, 342R, and the exit side polarizing plates 343B, 343R from the discharge ports 63B, 63R. Therefore, it is possible to prevent dust from being caught by the cooling air.

According to the embodiment described above, the following effects can be obtained.
The projector 1 according to this embodiment includes an incident side polarizing plate 341, a liquid crystal panel 342, and an emission side polarizing plate 343, and further includes a duct 6 and a guide member 7. The guide member 7 surrounds the outer shape of the discharge port 63 by the guide body 71 (opening 72), and extends from the discharge port 63 to the incident side polarizing plate 341, the liquid crystal panel 342, and the emission side polarizing plate 343. In addition, a part of the side surfaces of the incident-side polarizing plate 341, the liquid crystal panel 342, and the emission-side polarizing plate 343 are surrounded, not all, but partly. With this configuration, the entrainment of dust DS accompanying the discharge of cooling air is suppressed. Therefore, adhesion of dust DS to the incident side polarizing plate 341, the liquid crystal panel 342, and the emission side polarizing plate 343 can be reduced. Therefore, color unevenness of the projected image projected from the projector 1 can be suppressed, and the projected image quality can be maintained.

  In the projector 1 of this embodiment, the guide member 7 surrounds the outer shape of the discharge port 63 by the guide main body 71 and extends from the discharge port 63 to the incident side polarizing plate 341, the liquid crystal panel 342, and the emission side polarizing plate 343. Is enclosed. Further, the guide wall 73 surrounds part of the side surfaces of the incident side polarizing plate 341, the liquid crystal panel 342, and the emission side polarizing plate 343. Therefore, the adhesion of the dust DS to the liquid crystal panel 342 and the like can be reduced with a simple configuration and without increasing the size of the projector 1 compared to the related art.

  In the projector 1 of the present embodiment, when the discharge port 63G and the liquid crystal panel 342G are viewed from the light beam incident side (−X direction), the center line A1 of the discharge port 63G is relative to the surface (incident surface) of the liquid crystal panel 342G. It is shifted from the center line A2 to the upstream side (−Y direction) of the cooling air G1 flowing in the duct 6. As described above, the dust DS easily adheres when the liquid crystal panel 342G and the discharge port 63G are arranged. However, the guide member 7 can reduce the adhesion of the dust DS. The height of the guide wall 73 is set so that the guide wall 73 is on the lower side (−Z direction), which is the upstream side of the cooling air G1 from the center portion C1. As a result, the cooling air G1 that flows so as to incline in the left direction (+ Y direction) is not blocked by the guide wall 73, and the cooling air G1 can flow to the upper left of the liquid crystal panel 342G. Accordingly, the adhesion of the dust DS can be reduced without reducing the cooling efficiency of the incident side polarizing plate 341, the liquid crystal panel 342, and the emission side polarizing plate 343.

  The projector 1 of the present embodiment includes guide members 7 according to the number of liquid crystal panels 342 (342G, 342B, 342R). Specifically, the guide member 7 includes three openings 72 corresponding to the three outlets 63 that discharge cooling air to the three liquid crystal panels 342. In addition, a guide wall 73 (731, 732, 733, 734) is provided corresponding to the three liquid crystal panels 342. Accordingly, each liquid crystal panel 342 can be reliably cooled, and the adhesion of dust DS to each liquid crystal panel 342 can be reduced, so that color unevenness in the projected image can be suppressed.

  In the projector 1 according to the present embodiment, the guide member 7 is integrally formed to correspond to the three liquid crystal panels 342. Thereby, compared with the case where the guide member 7 is configured as a separate body corresponding to the three liquid crystal panels 342, the guide member 7 can be easily handled and the number of assembling steps can be reduced.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made without departing from the scope of the invention. A modification will be described below.

  The guide member 7 of the above embodiment is configured integrally and corresponds to the three liquid crystal panels 342. However, the guide member 7 is not limited to this, and may be configured separately and correspond to the respective liquid crystal panels 342. . Specifically, the guide member 7 may be configured as a separate unit for each color light, with the guide main body 71, the opening 72 corresponding to the discharge port 63, and the guide wall 73 as a minimum unit.

  The guide member 7 according to the embodiment includes three openings 72 corresponding to the three discharge ports 63 and guide walls 73 corresponding to the three liquid crystal panels 342. However, the present invention is not limited to this, and an opening 72 and a guide wall 73 corresponding to the discharge port 63 may be provided according to the number of liquid crystal panels 342 to be used.

  In the guide member 7 of the embodiment, when the guide walls 731 and 732 are viewed from above, the guide walls 731 and 732 are substantially L-shaped, but the guide walls 731 and 732 are not limited to this shape, and the liquid crystal panel 342 is formed. Any shape that surrounds a part of the side surface of the plate may be used.

  The projector 1 of the embodiment employs a so-called three-plate method using three liquid crystal panels 342 corresponding to R light, G light, and B light. However, the present invention is not limited to this, and a single-plate liquid crystal panel may be adopted. Further, a liquid crystal panel for improving the contrast may be additionally employed.

  The light source device 30 of the embodiment employs an ultra-high pressure mercury lamp, but is not limited thereto, and various discharge lamps that emit light with high brightness can be employed. For example, a metal halide lamp or a high-pressure mercury lamp Etc. can be adopted. Further, the light source device 30 is not limited to this, and the light source device 30 may adopt various solid light emitting elements such as an LED (Light Emitting Diode), an organic EL (Electro Luminescence) element, and a silicon light emitting element.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 6 ... Duct, 7 ... Guide member, 30 ... Light source device, 34 ... Electro-optical device, 61 ... Duct main body, 63 ... Discharge port, 71 ... Guide main body, 72 ... Opening part, 73 ... Guide wall, 341 ... Incident side polarizing plate, 342 ... Liquid crystal panel, 343 ... Outgoing side polarizing plate, A1, A2 ... Center line, DS ... Dust, G1 ... Cooling air.

Claims (4)

A projector that modulates and projects a light beam emitted from a light source according to image information,
A light modulation device for modulating the luminous flux;
A duct having a discharge port for discharging cooling air for cooling the light modulation device;
A guide member that suppresses entrainment of dust and flows the cooling air by surrounding the discharge port to the light modulation device and part of the side surface of the light modulation device;
A projector comprising: The projector according to claim 1,
The center line passing through the horizontal center of the discharge port is on the upstream side in the flow direction of the cooling air in the duct with respect to the center line passing through the horizontal center of the light incident surface of the light modulator. A projector characterized by being displaced. The projector according to claim 2,
The projector is characterized in that the guide member is arranged upstream of the center of the incident surface in the flow direction of the cooling air. It is a projector as described in any one of Claims 1-3, Comprising:
The guide member is provided according to the number of the light modulation devices, and is integrally formed.

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