JP2017219784A - projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector capable of efficiently cooling a cooling object.SOLUTION: A projector comprises: a light source unit; an image formation unit forming an image by light emitted from the light source unit; a projection optical unit projecting the image formed by the image formation unit; a cooling unit causing cooling air to circulate in a first direction from one end side toward the other end side of a first surface to a portion to be cooled positioned on the first surface in a cooling object having the first surface and a second surface facing each other; and a turbulence generation section being positioned at an opposite direction side to the first direction with respect to the portion to be cooled and generating turbulence to the cooling air. The turbulence generation section includes: an inclined surface inclined in a direction in which approaching the first surface as it goes from an inclination base point positioned closer to a second surface side than an extension surface of the first surface toward the first direction; and a plurality of recessed portions being positioned on the inclined surface and arranged in a second direction perpendicular to the first direction. The image formation unit has an optical component as the cooling object.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a projector.

  Conventionally, a light source device, a light modulation device that modulates light emitted from the light source device to form an image according to image information, and projection optics that enlarges and projects the formed image onto a projection surface such as a screen And a projector including the apparatus. As such a projector, a projector including a combination of a liquid crystal display unit and a polarizing plate as a light modulation device is known (for example, see Patent Document 1).

The liquid crystal display unit used in the projector described in Patent Document 1 is composed of a liquid crystal panel housed in an outer frame. Such a liquid crystal display unit is cooled by cooling air blown from the lower side (the side opposite to the side to which the flexible cable is joined).
However, in the structure of the conventional liquid crystal display unit, the cooling air directed downward of the liquid crystal panel is repelled by the side wall of the outer frame and is not efficiently guided to the panel surface, so that the liquid crystal panel cannot be efficiently cooled. There was a problem.
On the other hand, in the liquid crystal display unit described in Patent Document 1, an inclined surface is formed on the side wall of the lower side of the outer frame, and cooling air is circulated on the panel surface along the inclined surface.

JP 2004-45680 A

  Here, in the configuration of the liquid crystal display unit described in Patent Document 1, the cooling air flowing along the inclined surface from the lower side flows upward along the panel surface. However, in reality, boundary layer separation occurs where the crossing portion between the inclined surface and the panel surface becomes a separation point, and the airflow of the cooling air separates from the panel surface. For this reason, the cooling air is difficult to circulate so as to be in contact with the panel surface (trace the panel surface), and there is a problem that the cooling efficiency of the liquid crystal display unit is not so high.

  SUMMARY An advantage of some aspects of the invention is to provide a projector capable of efficiently cooling an object to be cooled.

  A projector according to an aspect of the present invention includes a light source device, an image forming device that forms an image with light emitted from the light source device, a projection optical device that projects the image formed by the image forming device, In a cooling target having a first surface and a second surface facing each other, cooling air is circulated along a first direction from one end side to the other end side of the first surface to a cooling portion located on the first surface. And a turbulent flow generating unit that is located on the opposite side of the first direction with respect to the cooling portion and generates turbulent flow in the cooling air, the turbulent flow generating unit, An inclined surface that is inclined in a direction closer to the first surface as it goes from the inclined base point that is located on the second surface side of the extended surface of the first surface toward the first direction; Arranged along the second direction perpendicular to the direction It has a plurality of recesses, wherein the image forming apparatus comprising the optical component as the cooling target.

  According to such a configuration, when the cooling air flows through the turbulent flow generating portion located on the opposite side to the first direction with respect to the cooling portion (upstream side in the cooling air flow path), the cooling air is First, it circulates along the inclined surface. At this time, since turbulent flow is generated by the plurality of concave portions located on the inclined surface, the separation point of boundary layer separation is changed from the apex of the inclined surface (the end portion on the first direction side in the inclined surface) It can be shifted downstream in the flow path. For this reason, since it can suppress that boundary layer peeling generate | occur | produces in the said vertex, a cooling wind can be distribute | circulated so that a 1st surface may be touched (it traces a 1st surface), and by extension, the said 1st surface Cooling air can be circulated so as to be in contact with the cooling portion located at the position. Therefore, the cooling part can be efficiently cooled. Moreover, since the flow resistance of the cooling air can be reduced by generating the turbulent flow as described above, the flow velocity of the cooling air flowing along the first surface can be increased. Therefore, also in this respect, the cooling efficiency of the first surface, and hence the cooling part, can be increased.

In the one aspect, it is preferable that at least a part of each of the plurality of recesses is located on the opposite side of the first direction from the end of the inclined surface on the first direction side.
According to such a configuration, at least a part of each of the plurality of recesses is located upstream in the cooling air flow path from the end portion on the first direction side that becomes the separation point when the boundary layer separation occurs on the inclined surface. Will be located. According to this, since the turbulent flow can be reliably generated in the circulating cooling air by the portion located on the upstream side, occurrence of the boundary layer separation can be reliably suppressed. Therefore, the cooling efficiency of the cooling part can be reliably increased.

In the one aspect, the turbulent flow generation unit is located on the same plane as the first surface and has an intersecting surface that intersects the inclined surface, and the plurality of recesses include the inclined surface and the intersecting surface. It is preferable that it is formed across the crossing sites.
Note that the fact that the intersecting surface is located on the same plane as the first surface indicates that the intersecting surface is located on the first surface or an extended surface of the first surface.
According to such a configuration, the plurality of recesses are positioned at a separation point when the boundary layer separation occurs, and the plurality of recesses ensure turbulence in the cooling air flowing through the first surface. The generation of the boundary layer can be more reliably suppressed. Therefore, the cooling air can be circulated more reliably so as to be in contact with the first surface.
Moreover, even if there is a recess or a gap between the turbulent flow generation part and the first surface because the intersecting surface on which some of the plurality of recesses are located is flush with the first surface, the turbulence The cooling air containing the turbulent flow generated in the flow generation unit can be circulated so as to be in contact with the first surface, and thus the cooling site.
Therefore, the cooling efficiency of the cooling part can be further reliably increased.

In the one aspect, it is preferable that an inner diameter dimension in the first direction of each of the plurality of recesses is larger than an inner diameter dimension in the second direction.
Here, when the inner diameter dimension in the first direction of all the recesses is smaller than the inner diameter dimension in the second direction, the flow resistance of the cooling air flowing through the recesses is increased.
On the other hand, since the inner diameter dimension in the first direction of each of the plurality of recesses is larger than the inner diameter dimension in the second direction, the flow resistance of the cooling air flowing in the first direction can be reduced. Accordingly, it is possible to suppress a decrease in the flow velocity of the cooling air flowing along the first surface, and it is possible to increase the cooling efficiency of the cooling portion.
In addition, generation | occurrence | production of a turbulent flow is accelerated | stimulated according to the number and magnitude | size of the recessed part located in an inclined surface. As described above, when the airflow of the cooling air flowing along the first surface easily changes to turbulent flow, the flow path resistance of the cooling air is further reduced. For this reason, compared with the case where there is no recessed part in an inclined surface, the flow velocity of the cooling air which distribute | circulates along a 1st surface can be raised, and the cooling efficiency of a cooling site | part can be improved further.

In the one aspect, it is preferable that the plurality of concave portions have either an elliptical shape or an oval shape.
According to such a configuration, the above-described effects can be reliably achieved, and the recess can be easily formed on the inclined surface.

In the above aspect, it is preferable that the optical component includes an optical component main body and a holding member that holds the optical component main body, and the turbulent flow generation unit is integrated with the holding member.
According to such a configuration, there is no need to separately provide a member having a turbulent flow generation unit. Accordingly, the configuration of the projector can be simplified. In addition, since the turbulent flow generation unit is integrated with the holding member as described above, the position of the separation point moved by the turbulent flow generation unit can be easily controlled. Therefore, the above effect can be reliably achieved.

In the above aspect, the optical component includes a polarizing element that transmits light having a predetermined polarization direction and shields light having another polarization direction, a phase difference element that rotates a polarization direction of incident light, and the light source. A light modulation device that modulates light emitted from the device, and a polarization conversion element that is arranged between the light source device and the light modulation device and aligns the polarization direction of incident light. Is preferred.
Here, the polarizing element, the phase difference element, the light modulation device, and the polarization conversion element are elements and devices that are susceptible to heat while being easily heated at the time of operation of the projector.
On the other hand, since at least one of these optical components is cooled by the cooling air as a cooling target, deterioration of the optical components can be suppressed, and the projector can be stably operated. Therefore, the reliability of the projector can be increased.

1 is a perspective view showing an external appearance of a projector according to an embodiment of the invention. The top view which shows the apparatus main body in the said embodiment. The schematic diagram which shows the structure of the image projection apparatus in the said embodiment. 6 is a hexahedral view showing the liquid crystal panel in the embodiment. FIG. The perspective view which looked at the liquid crystal panel in the said embodiment from the light-incidence side. The perspective view which expands and shows the turbulent flow generation | occurrence | production part in the said embodiment. The figure which shows the simulation result of the flow velocity distribution of the cooling air which distribute | circulates the liquid crystal panel of the comparative example in the said embodiment. The figure which shows the simulation result of the flow velocity distribution of the cooling air which distribute | circulates the liquid crystal panel in the said embodiment. The figure which shows the simulation result of the flow velocity distribution of the cooling air which distribute | circulates the liquid crystal panel of the comparative example in the said embodiment. The figure which shows the simulation result of the flow velocity distribution of the cooling air which distribute | circulates the liquid crystal panel in the said embodiment. The perspective view which shows the housing | casing for optical components in the said embodiment. 6 is a hexahedral view showing the incident-side polarizing plate in the embodiment. FIG. The perspective view which looked at the incident side polarizing plate in the said embodiment from the light-projection side. The figure which shows the simulation result of the flow velocity distribution of the cooling air which distribute | circulates the incident side polarizing plate of the comparative example in the said embodiment. The figure which shows the simulation result of the flow velocity distribution of the cooling air which distribute | circulates the incident side polarizing plate in the said embodiment. The perspective view which shows the liquid crystal panel from which the shape of the recessed part in the said embodiment differs.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Schematic configuration of projector]
FIG. 1 is a perspective view showing an external appearance of a projector 1 according to the present embodiment.
The projector 1 according to the present embodiment modulates light emitted from the light source device 41 housed therein to form an image according to image information, and enlarges and projects the image on a projection surface such as a screen. It is a display device. As shown in FIG. 1, the projector 1 includes an exterior housing 2 that forms an exterior, and an apparatus main body 3 (see FIG. 2) that is accommodated in the exterior housing 2.
Such a projector 1 is provided with a turbulent flow generation unit that generates turbulent flow on the upstream side of the flow path of the cooling air flowing through the cooling target with respect to the cooling target of the cooling target. One feature is that the occurrence of boundary layer separation in which the airflow of the cooling air flows away from the cooling site is suppressed, thereby improving the cooling efficiency of the object to be cooled.
Each configuration will be described below.

[Configuration of exterior casing]
As shown in FIG. 1, the exterior housing 2 has an overall substantially rectangular parallelepiped shape, and is formed of a synthetic resin in the present embodiment. The exterior housing 2 includes an upper case 2A, a lower case 2B, a front case 2C, and a rear case 2D, which are configured in combination. Such an exterior housing 2 has a top surface portion 21, a bottom surface portion 22, a front surface portion 23, a back surface portion 24, a left side surface portion 25, and a right side surface portion 26.
The top surface portion 21 is mainly configured by the upper case 2A. The bottom surface portion 22 is mainly configured by the lower case 2B. The front part 23 is constituted by a front case 2C, and the back part 24 is constituted by a rear case 2D. The left side surface portion 25 and the right side surface portion 26 are each configured by a part of each case 2A to 2D.

A cover member 211 that opens and closes an opening (not shown) through which the light source device 41 is inserted and removed from the exterior housing 2 is detachably attached to the top surface portion 21.
The bottom surface portion 22 is provided with a plurality of legs 221 (only two legs 221 are shown in FIG. 1) that contact the projector 1 with the mounting surface.
The front surface 23 is formed with a substantially semicircular opening 231 through which an image projected from a projection optical device 48 described later passes.
The right side surface portion 26 is formed with an air inlet 261 through which air outside the exterior housing 2 is introduced into the inside by the cooling device 8 described later.
The left side surface portion 25 is formed with an exhaust port 251 (see FIG. 2) through which the air supplied to the cooling target to be circulated is exhausted.

[Device configuration]
FIG. 2 is a plan view showing the apparatus main body 3 arranged in the exterior housing 2. In FIG. 2, illustration of a part of the apparatus main body 3 is omitted.
The apparatus main body 3 corresponds to the internal configuration of the projector 1. As shown in FIG. 2, the apparatus main body 3 includes an image projection device 4 and a cooling device 8. In addition to these, although not shown, the apparatus main body 3 includes a control device that controls the operation of the entire projector 1, a power supply device that supplies power to the electronic components constituting the projector 1, and the like.

[Configuration of image projection apparatus]
FIG. 3 is a schematic diagram showing the configuration of the image projection apparatus 4.
The image projection device 4 forms and projects an image according to a drive signal (image information) input from the control device. As shown in FIG. 3, the image projection device 4 includes a light source device 41, an image forming device 42, and a projection optical device 48.
Among these, the light source device 41 emits light to the image forming device 42. The light source device 41 includes an arc tube 411, a reflector 412, a collimating lens 413, and a housing 414 that accommodates them.

The image forming device 42 modulates the light emitted from the light source device 41 to form an image according to the image information. The image forming apparatus 42 includes an illumination optical device 43, a color separation device 44, a relay device 45, an electro-optical device 46, and an optical component casing 47.
The illumination optical device 43 equalizes the illuminance in the plane orthogonal to the central axis of the light beam emitted from the light source device 41. The illumination optical device 43 includes a first lens array 431, a second lens array 432, a polarization conversion element 433, and a superimposing lens 434 in the order of incidence of light from the light source device 41. The illumination optical device 43 may include a light control device that adjusts the amount of light passing therethrough, and may employ a rod integrator instead of the first lens array 431 and the second lens array 432.

The color separation device 44 separates each color light of red (R), green (G), and blue (B) from the light beam incident from the illumination optical device 43. The color separation device 44 includes dichroic mirrors 441 and 442 and a reflection mirror 443.
The relay device 45 is provided on an optical path of red light having a longer optical path than other color lights among the three separated color lights. The relay device 45 includes an incident side lens 451, a relay lens 453, and reflection mirrors 452 and 454.

The electro-optical device 46 modulates each separated color light according to image information, and then synthesizes each color light to form a projection image projected by the projection optical device 48. The electro-optical device 46 includes a field lens 461, an incident-side polarizing plate 5, an optical compensation plate 6, and a liquid crystal panel 7 as a light modulator (7R, red, green, and blue liquid crystal panels, respectively) provided for each color light. 7G and 7B) and the output-side polarizing plate 462, and a color composition device 463 for synthesizing the modulated color lights to form a projection image. Among these, the color composition device 463 is configured by a cross dichroic prism in the present embodiment, but may be configured by a plurality of dichroic mirrors.
The three liquid crystal panels 7, the three output side polarizing plates 462, and the color composition device 463 are each provided with a first support member (not shown) arranged in accordance with each light incident surface of the color composition device 463 and a later-described first. It is unitized by 2 support members HM. The configurations of the incident side polarizing plate 5, the optical compensation plate 6, and the liquid crystal panel 7 will be described in detail later.

  The optical component casing 47 is a casing that accommodates the devices 41 and 42 and in which the projection optical device 48 is disposed at a predetermined position. The optical component casing 47 is provided with an illumination optical axis Ax that is a designed optical axis, and the devices 41 to 46 and 48 are arranged at predetermined positions with respect to the illumination optical axis Ax. For this reason, when the light source device 41 is disposed in the optical component casing 47, the central axis of the light emitted from the light source device 41 coincides with the illumination optical axis Ax. The configuration of the optical component casing 47 will be described in detail later.

  The projection optical device 48 enlarges and projects the projection image formed by the image forming device 42 on the projection surface. The projection optical device 48 is configured as a combined lens including a plurality of lenses (not shown) and a lens barrel 481 that accommodates the plurality of lenses therein.

[Configuration of cooling device]
The cooling device 8 circulates cooling air (cooling gas) through the cooling object constituting the apparatus main body 3 to cool the cooling object. As illustrated in FIG. 2, the cooling device 8 includes fans 81 to 84 and ducts 85 and 86.
The fans 81 and 82 are constituted by a centrifugal fan (sirocco fan), and are arranged between the projection optical device 48 and the inner surface of the right side surface portion 26 with the intake surface facing the intake port 261. The fans 81 and 82 suck air outside the outer casing 2 through the air inlet 261 and introduce the air into the outer casing 2 as a cooling gas. The fans 81 and 82 distribute the sucked air as cooling air to the electro-optical device 46 via the duct 85.

Although not shown in detail, the duct 85 is connected to the outlets of the fans 81 and 82. The duct 85 divides the cooling air sent from one of the fans 81 and 82 into two, and the one cooling air is placed near one liquid crystal panel 7 of the three liquid crystal panels 7. The other cooling air is sent near the other liquid crystal panel 7 from the bottom surface portion 22 side toward the top surface portion 21 side.
Further, the duct 85 divides the cooling air sent from the other one of the fans 81 and 82 into two, the one cooling air near the remaining one liquid crystal panel 7, and the other cooling air is polarized. In the vicinity of the conversion element 433, it is sent from the bottom surface portion 22 side toward the top surface portion 21 side.

The fan 83 is a centrifugal fan and is disposed in the vicinity of the light source device 41. The fan 83 sucks the gas in the exterior housing 2 and sends it as a cooling air to the light source device 41 to cool the arc tube 411.
The duct 86 is formed in a substantially L shape, and is arranged at a position on the left side surface portion 25 side in the exterior housing 2. Specifically, the duct 86 is disposed such that a portion on one end side is along the light source device 41 and a portion on the other end side is along the left side surface portion 25. The duct 86 introduces cooling air that has cooled the image projection device 4, the power supply device, the control device, and the like.
The fan 84 is disposed in the duct 86 and discharges the cooling air introduced into the duct 86 to the outside of the exterior housing 2 through the exhaust port 251. In addition, although such a fan 84 is comprised with the axial flow fan in this embodiment, you may comprise with a centrifugal-force fan.

[Configuration of LCD panel]
4 is a hexahedral view showing the liquid crystal panel 7, and FIG. 5 is a perspective view of the liquid crystal panel 7 as viewed from the light incident side.
The liquid crystal panel 7 corresponds to one of optical components to be cooled according to the present invention, in addition to being a light modulation device as described above. As shown in FIGS. 4 and 5, the liquid crystal panel 7 includes a panel main body 71 as an optical component main body, and a holding member 72 that holds the panel main body 71, and the holding member 72 is a second support member HM. Attached to.

  In the following description, among the + X direction, + Y direction, and + Z direction orthogonal to each other, the + Z direction is defined as the color light incident on one liquid crystal panel 7 of the three liquid crystal panels 7 (7B, 7G, 7R). The direction of travel. Further, the + Y direction is a direction from the bottom surface portion 22 toward the top surface portion 21, and the + X direction is from the left side to the right side when the one liquid crystal panel 7 is viewed from the light emitting side so that the + Y direction side is the upper side. The direction. Further, a direction opposite to the + Z direction is defined as a −Z direction. The same applies to the −X direction and the −Y direction.

For example, in the liquid crystal panel 7G, the + Z direction is a traveling direction of green light incident on the liquid crystal panel 7G (a direction from the back surface portion 24 side to the front surface portion 23 side), and the + Y direction is from the bottom surface portion 22 side. The direction toward the top surface portion 21 side, and the + X direction is a direction from the left side surface portion 25 side toward the right side surface portion 26 side.
On the other hand, in the liquid crystal panel 7R, the + Z direction is a traveling direction of red light incident on the liquid crystal panel 7R (a direction from the right side surface portion 26 side to the left side surface portion 25 side), and the + Y direction is from the bottom surface portion 22 side. The + X direction is a direction from the back surface 24 side to the front surface 23 side.
On the other hand, in the liquid crystal panel 7B, the + Z direction is the traveling direction of the blue light incident on the liquid crystal panel 7B (the direction from the left side surface portion 25 side to the right side surface portion 26 side), and the + Y direction is from the bottom surface portion 22 side. It is a direction toward the top surface portion 21 side, and the + X direction is a direction toward the back surface portion 24 side from the front surface portion 23 side.

  The panel main body 71 modulates incident color light according to the drive signal, and forms an image according to the color light. The panel body 71 is connected to the control device via a flexible printed circuit board FPC extending from the panel body 71 in the + Y direction side, and a drive signal is input from the control device.

The holding member 72 is a frame that houses the panel body 71. The holding member 72 is made of a material having thermal conductivity (for example, metal), and also functions as a heat radiating member that radiates heat conducted from the panel body 71 accommodated therein. Such a holding member 72 includes an incident side holding frame 73 positioned on the light incident side (−Z direction side) with respect to the panel body 71, and an emission side holding frame 75 positioned on the light emission side (+ Z direction side). The holding member 72 is configured by combining the holding frames 73 and 75 so as to sandwich the panel main body 71 therebetween.
Among these, the light incident side surface of the incident side holding frame 73 is the light incident surface 7SA (corresponding to the first surface of the present invention) of the liquid crystal panel 7, and the light emitting surface of the emission side holding frame 75 is liquid crystal. This is the light exit surface 7SB of the panel 7 (corresponding to the second surface of the present invention). The holding member 72 is fixed to the second support member HM so that the light emitting surface 7SB is connected to be able to conduct heat.

Here, the configuration of the second support member HM will be described.
The second support member HM is a member that holds the liquid crystal panel 7 by attaching the holding member 72 (the emission side holding frame 75) to the light incident side surface. The second support member HM is made of a material having thermal conductivity (for example, metal), and also functions as a heat radiating member that radiates heat conducted from the emission side holding frame 75. Although not shown, an opening through which the colored light that has passed through the emission-side holding frame 75 passes is formed at the approximate center of the second support member HM.
Further, elongated holes HM1 whose major axis extends in the + Y direction are formed at the four corners of the second support member HM as viewed from the light incident side. The long holes HM1 are inserted with the arm portions of the first support members (not shown) disposed on the respective light incident surfaces on which the corresponding color light is incident in the color synthesizing device 463, so that the second support is performed. The member HM is supported by the first support member. The liquid crystal panel 7 and the emission-side polarizing plate 462 are integrated with the color composition device 463 by the second support member HM and the first support member.

The incident-side holding frame 73 has a rectangular opening 731 that allows incident color light to pass therethrough and allows the color light to enter the panel body 71 at substantially the center. The opening 731 is closed by a dustproof member 732 having light transmittance and heat conductivity. The dustproof member 732 also functions as a heat radiating member that radiates heat conducted from the panel body 71. That is, the arrangement part of the dustproof member 732 is a cooling part in the liquid crystal panel 7, and the panel main body 71 is cooled by cooling the dustproof member 732.
Further, a plurality of protrusions 733 functioning as heat radiating fins are formed along the + Y direction at a portion on the + Y direction side with respect to the opening 731 in the incident side holding frame 73.
On the other hand, although not shown in the figure, the exit-side holding frame 75 also has a substantially rectangular opening that passes through the color light modulated by the panel body 71 and is closed by a dustproof member similar to the dustproof member 732. Have.

[Configuration of turbulent flow generator]
FIG. 6 is an enlarged perspective view showing the turbulent flow generation unit 74 in the liquid crystal panel 7. In FIG. 7, only a part of the recess 743 is denoted by a reference numeral.
The incident-side holding frame 73 includes a turbulent flow generation unit 74 that generates turbulent flow in the cooling air flowing from the duct 85 along the light incident surface 7SA.
As shown in FIGS. 5 and 6, the turbulent flow generation unit 74 is disposed on the light incident surface 7SA of the liquid crystal panel 7 where the dustproof member 732 serving as a cooling part is disposed (image formation of the panel body 71 via the dustproof member 732 is performed It is located on the −Y direction side, that is, on the upstream side of the cooling air with respect to the portion where the region is exposed.
Such a turbulent flow generation unit 74 has an inclined surface 741, an intersecting surface 742, and a plurality of recesses 743, and the turbulent flow generation unit 74 is integrated with the incident side holding frame 73.

The inclined surface 741 is a surface that is inclined with respect to the + Y direction, which is the flow direction of the cooling air that cools the liquid crystal panel 7. Specifically, the inclined surface 741 receives light from the inclined base point P1 located on the light emitting surface 7SB side (that is, + Z direction side) from the extended surface EP1 (see FIG. 9) of the light incident surface 7SA toward the + Y direction side. The surface is inclined in the direction close to the surface 7SA (extension surface EP1) (that is, the −Z direction). Then, the cooling air sent to the liquid crystal panel 7 from the duct 85 toward the + Y direction flows along the inclined surface 741 and then flows along the light incident surface 7SA toward the + Y direction side.
The intersecting surface 742 intersects the inclined surface 741. The intersection surface 742 is flush with the light incident surface 7SA, and more specifically, is a part of the end portion on the −Y direction side of the light incident surface 7SA. That is, the intersecting surface 742 is located on the same plane as the light incident surface 7SA and the extension surface EP1.

The plurality of recesses 743 are located at the intersection part P2 between the inclined surface 741 and the intersection surface 742, and along the + X direction orthogonal to the + Y direction that is the flow direction of the cooling air from the duct 85 at the intersection part P2. Are arranged at predetermined intervals. These concave portions 743 are formed in a substantially elliptical shape across the inclined surface 741 and the intersecting surface 742, and the portion on the −Y direction side in the concave portion 743 is located on the −Y direction side from the intersecting portion P2, and is in the + Y direction. The side end is located in a range that does not reach the opening 731.
These substantially elliptical recesses 743 are formed so that the major axis is along the + Y direction. That is, in each concave portion 743, the inner diameter dimension in the + Y direction is larger than the inner diameter dimension in the + X direction. In the present embodiment, the dimension in the + X direction of the intersecting portion P2 is approximately 20 mm, the major axis (inner diameter dimension along the + Y direction) of the recess 743 is 1.5 mm, and the minor axis (inner diameter dimension along the + X direction). ) Is 0.6 mm and the depth is 0.15 mm. The distance between the centers of the recesses 743 is 1 mm, and 19 recesses 743 are formed at the intersection P2.

The bottom 744 of the recess 743 is formed by an upstream bottom 745 and a downstream bottom 746 that intersect each other.
The upstream side bottom portion 745 is a bottom surface substantially parallel to the inclined surface 741 and is located on the inclined surface 741. On the other hand, the downstream side bottom portion 746 is a bottom surface substantially parallel to the intersecting surface 742 and is located on the intersecting surface 742.

[Flow of cooling air flowing through the LCD panel]
Hereinafter, the flow velocity distribution of the cooling air sent from the duct 85 toward the liquid crystal panel 7 according to the present embodiment and the cooling sent from the duct 85 toward the liquid crystal panel 7X as a comparative example for the liquid crystal panel 7. A simulation result with the wind velocity distribution will be described.
The liquid crystal panel 7X has the same configuration as the liquid crystal panel 7 except that the plurality of recesses 743 are not formed.

FIG. 7 is a diagram illustrating a simulation result of the flow velocity distribution of the cooling air flowing through the liquid crystal panel 7X when the liquid crystal panel 7X is viewed from the + X direction side. In addition, the relationship of the speed (flow velocity) of the cooling air shown in FIG. 7 is S1>S2>S3>S4> S5, where S1 is the highest and S5 is the lowest.
When the cooling air is circulated from the duct 85 to the liquid crystal panel 7X, as shown in FIG. 7, the intersection part P2 between the inclined surface 741 and the intersection surface 742 becomes a separation point, and the −Z direction side from the light incident surface 7SA ( Boundary layer separation in which the airflow of the cooling air leaves on the inclined surface 741 side) occurs. In this case, the airflow of the cooling air flowing in the + Y direction side along the liquid crystal panel 7X is separated from the light incident surface 7SA of the liquid crystal panel 7X. For this reason, the flow velocity of the cooling air flowing so as to be in contact with the light incident surface 7SA (tracing the light incident surface 7SA) is low.

FIG. 8 is a diagram illustrating a simulation result of the flow velocity distribution of the cooling air flowing through the liquid crystal panel 7 when the liquid crystal panel 7 according to the present embodiment is viewed from the + X direction side. The relationship between the cooling air speed (flow velocity) shown in FIG. 8 is the same as the relationship shown in FIG.
On the other hand, when the cooling air is circulated from the duct 85 to the liquid crystal panel 7, when the cooling air circulated along the inclined surface 741 reaches the intersection P2, a part of the cooling air is located on the inclined surface 741. Turbulence is generated by the plurality of recesses 743. For this reason, as shown in FIG. 8, the boundary layer separation is less likely to occur at the intersection P2, and the airflow of the cooling air flowing in the + Y direction side along the light incident surface 7SA is separated from the light incident surface 7SA. It becomes difficult. In other words, the cooling airflow circulates in contact with the light incident surface 7SA.
It is considered that this is because the generation of turbulent flow is promoted by the flow of cooling air through the plurality of recesses 743 and the flow path resistance is reduced.

FIG. 9 is a diagram showing a simulation result of the flow velocity distribution when the liquid crystal panel 7X is viewed from the −Z direction side (light incident side), and FIG. 10 shows the liquid crystal panel 7 at the −Z direction side (light incident side). It is a figure which shows the simulation result of the said flow-velocity distribution at the time of seeing from (). The relationship between the cooling air speed (flow velocity) shown in FIGS. 9 and 10 is T1>T2>T3>T4> T5, where T1 is the highest and T5 is the lowest.
As described above, when the cooling air flows through the liquid crystal panel 7X as the comparative example and the liquid crystal panel 7 according to the present embodiment, as shown in FIG. 9 and FIG. 10, along the light incident surface 7SA. Differences occur in the flow rate of circulation.
Specifically, on the light incident surface 7SA of the liquid crystal panel 7X, as shown in FIG. 9, the region of the flow velocity T2 and the region of the flow velocity T3 occupy almost the whole, and the region of the highest flow velocity T1 is slight.
On the other hand, on the light incident surface 7SA of the liquid crystal panel 7, as shown in FIG. 10, the region of the flow velocity T1 occupies more than half, and then the region of the flow velocity T2 is wide, while the region of the flow velocity T3 becomes small. Yes.
This is because the cooling air flowing from the duct 85 has the same flow velocity in the liquid crystal panel 7X and the liquid crystal panel 7, but in the liquid crystal panel 7, the cooling air flowing in contact with the light incident surface 7SA. It shows that the flow velocity of is generally high.

As described above, in the liquid crystal panel 7 according to the present embodiment, it is possible to suppress the occurrence of boundary layer peeling at the intersecting portion P2 as compared with the liquid crystal panel 7X as a comparative example without the plurality of recesses 743, and at the cooling portion. In addition to allowing the cooling air to flow so as to be in contact with the portion where the dust-proof member 732 is disposed, the flow velocity of the cooling air can be increased by reducing the flow resistance. Therefore, the liquid crystal panel 7 can be efficiently cooled.
As shown in FIG. 10, on the light incident surface 7SA of the liquid crystal panel 7, the flow velocity of the cooling air flowing through the central portion of the panel body 71 is high. For this reason, in the panel main body 71, the temperature is likely to be higher than other portions, and the central portion where heat is not easily transmitted to the outside can be effectively cooled.

[Configuration of optical component casing]
FIG. 11 is a perspective view showing the optical component casing 47. In FIG. 11, a part of the optical component casing 47 is not shown.
As shown in FIG. 11, the optical component casing 47 includes a component storage member 471 that stores the various optical components described above, and a lid-like member 472 that is positioned on the + Y direction side with respect to the component storage member 471. Prepare.

The component storage member 471 is formed in a substantially L shape along the back surface portion 24 and the right side surface portion 26, and a light source storage portion (not shown) is formed at the end on the left side surface portion 25 side. A lens connecting portion 4711 is formed at the end of the lens.
A substantially rectangular space S in which the electro-optical device 46 is disposed is formed on the other end side of the component storage member 471 and on the inner side of the lens connection portion 4711. In addition, although not shown in the drawing, the components storage member 471 includes a plurality of grooves 42 and 44 and a plurality of grooves into which the field lens 461 is inserted and disposed.
The lens connection portion 4711 is configured to form an edge on the front surface portion 23 side of the edge of the space S, and is a projection supported by a lens support member (not shown) fixed in the exterior housing 2. It is connected to the end of the optical device 48 on the back surface 24 side.

The lid-like member 472 is screwed to the component storage member 471 and closes a component storage opening (not shown) formed in the component storage member 471. Of the edge of the space S in the lid-like member 472, a support member that rotatably supports the incident-side polarizing plate 5 and the optical compensation plate 6 at a portion on the incident side of each color light to the electro-optical device 46. SM is attached.
As described above, the + Z direction indicates the traveling direction of the color light incident on one incident side polarizing plate 5 and one optical compensation plate 6 out of the three incident side polarizing plates 5 and the optical compensation plate 6, respectively. The direction. When the incident side polarizing plate 5 and the optical compensation plate 6 are viewed from the light emitting side so that the + Y direction is a direction from the bottom surface portion 22 toward the top surface portion 21 and the + X direction is the upper side of the + Y direction side. The direction from the left to the right. The −X direction, −Y direction, and −Z direction are the same as described above.

[Configuration of support member]
Each of the support members SM is a member that holds the incident-side polarizing plate 5 and the optical compensation plate 6 (details are holding members 52 and 62 described later in detail) so as to be rotatable about the illumination optical axis Ax. These support members SM are disposed on the light incident side with respect to the main body part SM1 and the main body part SM1 disposed substantially parallel to a plane orthogonal to the central axis of the colored light passing through the incident-side polarizing plate 5 and the optical compensation plate 6. It has a mounting portion SM2 that is bent and attached to the lid-like member 472, and is formed in a substantially L shape that is inverted up and down when viewed from the −X direction side.
In such a support member SM, the incident-side polarizing plate 5 is disposed on the light incident side, and the optical compensation plate 6 is disposed on the light emitting side. Although not shown, an opening for allowing the color light that has passed through the incident-side polarizing plate 5 to enter the optical compensation plate 6 is formed in the approximate center of the main body SM1.

[Configuration of optical compensator]
Here, the optical compensation plate 6 will be described first.
As shown in FIG. 11, the optical compensator 6 includes a compensator main body 61 and a holding member 62 that holds the compensator main body 61 and is rotatably supported by the support member SM.
The compensation plate body 61 has a function of compensating for a phase difference generated between ordinary light and extraordinary light due to birefringence generated in the liquid crystal panel 7 (panel body 71), and improving the clear vision characteristics of the liquid crystal panel 7. It is a plate-like member.
Similar to the support member SM, the holding member 62 is disposed along the XY plane and holds the compensation plate body 61. The holding member 62 is bent toward the light incident side with respect to the holding portion 63. And an operation portion 64 that overlaps the attachment portion SM2 on the + Y direction side. That is, like the support member SM, the holding member 62 is formed in a substantially L shape that is inverted up and down when viewed from the −X direction side.
Among these, the operation portion 64 is operated in the + X direction side and the −X direction side along the arc-shaped portion on the surface on the + Y direction side of the attachment portion SM <b> 2, so that the center of the color light that passes through the compensation plate body 61. The holding part 63 is rotated around the axis (coincidence with the illumination optical axis Ax). Thereby, the position of the optical compensation plate 6 (compensation plate body 61) can be adjusted, and the compensation direction of the compensation plate body 61 can be adjusted to the liquid crystal panel 7.

[Configuration of incident-side polarizing plate]
FIG. 12 is a hexahedral view showing the incident-side polarizing plate 5, and FIG. 13 is a perspective view of the incident-side polarizing plate 5 viewed from the light emitting side.
The incident side polarizing plate 5 corresponds to one of optical components to be cooled in the present invention. As described above, the incident-side polarizing plate 5 is disposed on the light incident side of the support member SM and is supported by the support member SM. As shown in FIGS. 12 and 13, the incident-side polarizing plate 5 has a polarizing plate main body 51 as an optical component main body, and holds the polarizing plate main body 51 and is rotatably supported by the support member SM. Holding member 52.
The polarizing plate body 51 has a function of transmitting one of the s-polarized light and the p-polarized light (linearly polarized light whose polarization direction is aligned by the polarization conversion element 433) and absorbing the other polarized light. For this reason, the polarizing plate main body 51 is heated according to the light quantity of the other polarized light absorbed. The light exit surface 51B of the polarizing plate main body 51 corresponds to the first surface of the present invention in the incident side polarizing plate 5, and the light incident surface 51A corresponds to the second surface of the present invention in the incident side polarizing plate 5. To do.

Similar to the holding member 62, the holding member 52 is disposed along the XY plane and holds the polarizing plate body 51. The holding member 52 is bent toward the light incident side with respect to the holding portion 53, and The operation portion 54 and the turbulent flow generation portion 55 that overlap with the attachment portion SM2 on the −Y direction side are formed, and are formed in a substantially L shape that is inverted up and down when viewed from the −X direction side. .
Among these, the operation part 54 is operated in the + X direction side and the −X direction side along the arc-shaped portion on the surface on the −Y direction side of the attachment part SM <b> 2, so that the colored light passing through the polarizing plate body 51 is operated. The holding part 53 is rotated around the central axis. Thereby, the position of the said incident side polarizing plate 5 can be adjusted so that the absorption axis of the polarizing plate main body 51 may orthogonally cross with respect to the polarization direction of the polarized light to pass.

The turbulent flow generation unit 55 is arranged on the light emission side (+ Z direction side) surface 53B of the holding unit 53 on the upstream side in the cooling air flow path with respect to the light emission surface 51B as the first surface in the polarizing plate body 51 ( -Y direction side). In other words, in the incident side polarizing plate 5, the light exit surface 51 </ b> B is a cooling part by the cooling air, and the turbulent flow generation unit 55 is integrated with the holding unit 53 and thus the holding member 52.
The turbulent flow generating portion 55 is formed in a substantially trapezoidal shape with the upper base facing the + Z direction and the lower base facing the −Z direction as viewed from the + X direction. Similar to the turbulent flow generation unit 74, the turbulent flow generation unit 55 cools the polarizing plate main body 51 by generating turbulent flow in the cooling air flowing along the + Y direction. Suppresses the occurrence of boundary layer separation in which the wind current separates.
In the present embodiment, the turbulent flow generation unit 55 is arranged in the holding unit 53 with a predetermined interval in the + Y direction between the polarizing plate main body 51 and the turbulent flow generation unit 55. However, the turbulent flow generation unit 55 (particularly the first inclined surface 551) and the polarizing plate main body 51 may be connected.

Such a turbulent flow generation unit 55 includes a first inclined surface 551, an intersecting surface 552, a second inclined surface 553, and a plurality of recesses 554.
The first inclined surface 551 corresponds to the inclined surface of the present invention, and extends from the inclined base point P3 in the vicinity of the −Y direction side end portion of the light emitting side surface 53B toward the + Y direction side, extending the light emitting surface 51B. It is inclined to the + Z direction side close to the surface EP2 (see FIG. 15). The end portion on the + Y direction side of the first inclined surface 551 is located on the extended surface EP2 of the light emitting surface 51B which is a cooling portion cooled by the cooling air. That is, the first inclined surface 551 is a surface inclined toward the + Z direction side closer to the light emitting surface 51B toward the + Y direction from the inclined base point P3 located on the light incident surface 51A side with respect to the extended surface EP2 of the light emitting surface 51B. is there.

The intersecting surface 552 is positioned on the + Y direction side with respect to the first inclined surface 551 and is connected to the edge on the + Y direction side of the first inclined surface 551. That is, the intersecting surface 552 intersects the first inclined surface 551 at the intersecting portion P4. The intersecting surface 552 is located on substantially the same plane as the light incident surface 51A, and is substantially the same plane as the extension surface EP2.
The second inclined surface 553 is located on the opposite side of the first inclined surface 551 with respect to the intersecting surface 552. That is, the second inclined surface 553 forms an end surface on the + Y direction side in the turbulent flow generation unit 55. The second inclined surface 553 is inclined to the −Z direction side from the end portion on the + Y direction side in the intersecting surface 552 toward the + Y direction.

The plurality of recesses 554 are spaced apart from each other at a crossing portion P4 between the first inclined surface 551 and the crossing surface 552 along the + X direction orthogonal to the + Y direction, which is the flow direction of the cooling air that cools the polarizing plate body 51. They are arranged apart. That is, the plurality of recessed portions 554 are formed across the first inclined surface 551 and the intersecting surface 552 at the intersecting portion P4, similarly to the plurality of recessed portions 743. These recesses 554 are formed so that the inner diameter dimension in the + Y direction is larger than the inner diameter dimension in the + X direction. In the present embodiment, each recess 554 is formed in an elliptical shape. The portions on the −Y direction side of these recesses 554 are located on the −Y direction side from the intersecting portion P4, and the + Y direction side portion is formed in a range that does not reach the second inclined surface 553.
In the present embodiment, six recesses 554 are formed at the intersection P4. However, the number of the recesses 554 may be changed as appropriate.

Similar to the bottom 744 of the recess 743, the bottom 555 of the recess 554 is formed by an upstream bottom 556 and a downstream bottom 557 that intersect with each other.
The upstream bottom portion 556 is a bottom surface substantially parallel to the first inclined surface 551 and is located on the first inclined surface 551. On the other hand, the downstream side bottom portion 557 is a bottom surface substantially parallel to the intersecting surface 552 and is located on the intersecting surface 552.

[Flow of cooling air flowing through the polarizing plate on the incident side]
Hereinafter, the flow velocity distribution of the cooling air sent from the duct 85 toward the incident side polarizing plate 5 according to the present embodiment, and the duct toward the incident side polarizing plate 5X as a comparative example with respect to the incident side polarizing plate 5. A simulation result with the flow velocity distribution of the cooling air sent from 85 will be described. The incident-side polarizing plate 5X has the same configuration as the incident-side polarizing plate 5 except that the plurality of concave portions 554 are not formed.

FIG. 14 is a diagram illustrating a simulation result of the flow velocity distribution of the cooling air flowing through the incident-side polarizing plate 5X. More specifically, FIG. 14 is a diagram showing a flow velocity distribution of the cooling air when the incident side polarizing plate 5X is viewed from the −X direction side. In addition, the relationship of the speed (flow velocity) of the cooling air shown in FIG. 14 is U1>U2>U3>U4> U5, U1 is the highest, and U5 is the lowest.
When cooling air is circulated from the duct 85 to the incident-side polarizing plate 5X, as shown in FIG. 14, the intersecting portion P4 between the first inclined surface 551 and the intersecting surface 552 becomes a separation point and + Z from the light emitting surface 51B. Boundary layer separation occurs in which the airflow of cooling air is separated on the direction side. In this case, similarly to the case of the liquid crystal panel 7X, the flow velocity of the cooling air flowing so as to be in contact with the light exit surface 51B of the polarizing plate body 51 (tracing the light exit surface 51B) is low.

FIG. 15 is a diagram illustrating a simulation result of the flow velocity distribution of the cooling air flowing through the incident-side polarizing plate 5. More specifically, FIG. 15 is a diagram showing the flow velocity distribution of the cooling air when the incident side polarizing plate 5 is viewed from the −X direction side. The relationship of the cooling air speed (flow velocity) shown in FIG. 15 is the same as that in FIG.
On the other hand, when the cooling air is circulated from the duct 85 to the incident-side polarizing plate 5, when the cooling air circulated along the first inclined surface 551 reaches the intersecting portion P4, the first inclined surface 551. A turbulent flow is generated by the plurality of recesses 554 that are partially located at the bottom. For this reason, as shown in FIG. 15, the boundary layer peeling is less likely to occur, and the airflow of the cooling air flowing in the + Y direction side along the light exit surface 51B of the polarizing plate body 51 is separated from the light incident surface 51A. It becomes difficult. In other words, the airflow of the cooling air circulates so as to be in contact with the light emitting surface 51B.
Although detailed simulation results are omitted, in the incident-side polarizing plate 5, the flow velocity of the cooling air flowing so as to be in contact with the light exit surface 51B is the same as that in the liquid crystal panel 7 in the incident-side polarizing plate 5X. Higher than when used. This is presumably because the generation of turbulent flow was promoted by the flow of cooling air through the plurality of recesses 554, and the flow path resistance was reduced.

  Thus, in the incident side polarizing plate 5 which concerns on this embodiment, generation | occurrence | production of boundary layer peeling in the said cross | intersection site | part P4 can be suppressed compared with the incident side polarizing plate 5X as a comparative example without the said some recessed part 554. Besides, the cooling air can be circulated so as to be in contact with the polarizing plate main body 51 (light emitting surface 51B) which is a cooling part, and the flow velocity of the cooling air can be increased by reducing the flow resistance. Therefore, the incident side polarizing plate 5 (polarizing plate main body 51) can be cooled efficiently.

[Effect of the embodiment]
The projector 1 according to the present embodiment described above has the following effects.
The image forming apparatus 42 includes an incident-side polarizing plate 5 and a liquid crystal panel 7 as optical components to be cooled.
Among these, the liquid crystal panel 7 has a turbulent flow that generates a turbulent flow in the cooling air flowing from the cooling device 8 (duct 85) along the + Y direction that is the first direction on the light incident surface 7SA as the first surface. The generation unit 74 is provided on the −Y direction side with respect to the cooling site (the position where the dustproof member 732 is disposed). The turbulent flow generation unit 74 includes an inclined surface 741 that is inclined in a direction closer to the light incident surface 7SA from the inclined base point P1 located on the light emitting surface 7SB side than the extended surface EP1 of the light incident surface 7SA toward the + Y direction. Have. The turbulent flow generation unit 74 includes a plurality of recesses 743 that are positioned on the inclined surface 741 and arranged along the + X direction that is the second direction orthogonal to the + Y direction.

According to such a configuration, the turbulent flow can be generated in the cooling air flowing through the light incident surface 7SA in the turbulent flow generation unit 74 having the plurality of recesses 743, thereby separating the boundary layer separation. The point can be shifted from the apex of the inclined surface 741 (that is, the intersecting portion P2) to the downstream side in the cooling air flow path. For this reason, since it can suppress that boundary layer peeling generate | occur | produces in the said crossing site | part P2, a cooling wind can be distribute | circulated so that the light-incidence surface 7SA may be contact | connected. Therefore, the above-mentioned cooling part and by extension, the panel main body 71 can be efficiently cooled.
Moreover, since the flow resistance of the cooling air can be reduced by generating the turbulent flow as described above, the flow velocity of the cooling air flowing along the light incident surface 7SA can be increased. Therefore, the cooling efficiency of the panel main body 71 can also be improved in this respect.

  On the other hand, the incident-side polarizing plate 5 includes a turbulent flow generating portion 55 that generates turbulent flow in the cooling air flowing through the light emitting surface 51B that is a cooling part of the incident-side polarizing plate 5 with respect to the light emitting surface 51B. It is on the −Y direction side that is the upstream side of the cooling air. The turbulent flow generation unit 55 approaches the light emitting surface 51B from the inclined base point P3 located on the light incident surface 51A side as the second surface to the + Y direction from the extended surface EP2 of the light emitting surface 51B as the first surface. It has the 1st inclined surface 551 inclined in the direction to do. In addition, the turbulent flow generation unit 55 includes a plurality of recesses 554 that are located on the first inclined surface 551 and arranged along the + X direction orthogonal to the + Y direction.

According to such a configuration, the turbulent flow can be generated in the cooling air flowing through the light exit surface 51B in the turbulent flow generating portion 55 having the plurality of concave portions 554, thereby separating the boundary layer separation. The point can be shifted from the top of the first inclined surface 551 (that is, the intersecting portion P4) to the downstream side in the cooling air flow path. For this reason, since it can suppress that boundary layer peeling generate | occur | produces in the said crossing site | part P4, a cooling wind can be distribute | circulated so that the light-projection surface 51B may be contact | connected. Therefore, the cooling part, and thus the polarizing plate body 51 can be efficiently cooled.
Similarly to the above, since the flow resistance of the cooling air can be reduced by promoting the generation of the turbulent flow, the flow velocity of the cooling air flowing along the light exit surface 51B can be increased. Therefore, also in this respect, the cooling efficiency of the polarizing plate body 51 can be increased.

In the turbulent flow generation unit 74, a part of each of the plurality of recesses 743 is located on the −Y direction side from the intersecting portion P2 that is an end portion on the + Y direction side of the inclined surface 741. According to this, the said part will be located in the upstream in the flow path of a cooling air rather than the cross | intersection site | part P2 used as a peeling point when the said boundary layer peeling arises in the inclined surface 741. FIG. For this reason, since the said part can generate | occur | produce a turbulent flow reliably in the circulating cooling air, generation | occurrence | production of the said boundary layer peeling can be suppressed reliably. Therefore, the cooling efficiency of the cooling part and by extension, the panel body 71 can be reliably increased.
In the turbulent flow generation unit 55, a part of each of the plurality of recesses 554 is located on the −Y direction side from the intersection part P4 that is the end portion on the + Y direction side of the first inclined surface 551. According to this, similarly to the above, turbulent flow can be reliably generated in the circulating cooling air by the part, so that occurrence of boundary layer separation can be reliably suppressed at the intersection P4. Therefore, the cooling efficiency of the cooling portion, and hence the polarizing plate main body 51 can be reliably increased.

The turbulent flow generation unit 74 is located on the same plane as the light incident surface 7SA, and has an intersecting surface 742 that intersects the inclined surface 741, and the plurality of recesses 743 includes the inclined surface 741 and the intersecting portion P2 of the intersecting surface 742. It is formed across. According to this, the plurality of recesses 743 are positioned at the separation point when the boundary layer separation occurs, and the plurality of recesses 743 reliably generate turbulent flow in the cooling air flowing through the light incident surface 7SA. And the occurrence of the boundary layer peeling can be more reliably suppressed. Therefore, the cooling air can be circulated more reliably so as to be in contact with the light incident surface 7SA, and the cooling efficiency of the panel body 71 can be further reliably increased.
Further, the turbulent flow generation unit 55 has an intersecting surface 552 that is located on the same plane as the light emitting surface 51B and intersects the first inclined surface 551, and the plurality of recesses 554 It is formed across the crossing part P4 of the surface 552. According to this, for the same reason as described above, the plurality of recesses 554 can reliably generate turbulent flow in the cooling air flowing through the light emitting surface 51B, and the occurrence of the boundary layer separation can be more reliably performed. Can be suppressed. Therefore, the cooling air can be circulated more reliably so as to be in contact with the light emitting surface 51B, and the cooling efficiency of the polarizing plate body 51 can be further reliably increased.

In the turbulent flow generation part 74, the inner diameter dimension in the + Y direction of each of the plurality of recesses 743 is larger than the inner diameter dimension in the + X direction orthogonal to the + Y direction. According to this, since the major axis of each recess 743 is along the flow direction of the cooling air, the flow path when the cooling air flows along the recess 743 compared to the case where the major axis is along the + X direction. Resistance can be reduced. Accordingly, it is possible to suppress a decrease in the flow velocity of the cooling air flowing along the light incident surface 7SA, and to improve the cooling efficiency of the panel body 71. Moreover, in the turbulent flow generation part 74, since the recessed parts 743 are densely arranged along the + X direction, generation of turbulent flow with respect to the cooling air is promoted. For this reason, the airflow of the cooling air flowing along the light incident surface 7SA easily changes to turbulent flow, and the flow path resistance is further reduced. Therefore, compared with the case where there is no recessed part 743, the flow velocity of the cooling air flowing along the light incident surface 7SA can be increased, and the cooling efficiency of the panel body 71 can be further increased.
On the other hand, in the turbulent flow generation part 55, the inner diameter dimension in the + Y direction of each of the plurality of recesses 554 is larger than the inner diameter dimension in the + X direction orthogonal to the + Y direction. According to this, similarly to the above, compared with the case where the long diameter of the recessed part 554 follows a + X direction, the flow-path resistance at the time of cooling air flowing along the recessed part 554 can be reduced. Therefore, it is possible to suppress a decrease in the flow velocity of the cooling air flowing along the light exit surface 51B, and to increase the cooling efficiency of the polarizing plate body 51.

  Each of the recesses 743 and 554 is formed in an elliptical shape. According to this, the above-described effects can be reliably achieved. In addition, the concave portion 743 can be easily formed on the inclined surface 741 and the concave portion 554 can be easily formed on the first inclined surface 551.

The liquid crystal panel 7 includes a panel main body 71 and a holding member 72 that holds the panel main body 71, and the turbulent flow generation unit 74 is integrated with the holding member 72 (incident side holding frame 73). . According to this, it is not necessary to separately provide a member having the turbulent flow generation unit 74. Therefore, the configuration of the projector 1 can be simplified. In addition, since the turbulent flow generation unit 74 is integrated with the holding member 72 as described above, the position of the separation point moved by the turbulent flow generation unit 74 can be easily controlled. Therefore, the above effect can be reliably achieved.
The same applies to the incident-side polarizing plate 5 that includes the polarizing plate main body 51 and the holding member 52 that holds the polarizing plate main body 51, and the turbulent flow generation unit 55 is integrated with the holding member 52.

  In the projector 1, the optical component as a cooling target transmits a light with a predetermined polarization direction and shields light with another polarization direction (transmits one linearly polarized light and shields the other linearly polarized light. The polarizing plate 5 is an incident side polarizing plate 5 and a liquid crystal panel 7 as a light modulation device that modulates light emitted from the light source device 41. According to this, since the incident-side polarizing plate 5 (polarizing plate main body 51) and the liquid crystal panel 7 (panel main body 71), which are vulnerable to heat, can be efficiently cooled by the cooling air, it is possible to suppress these deteriorations, and the projector 1 It can be operated stably. Therefore, the reliability of the projector 1 can be improved.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the embodiment described above, the shape of the concave portion 743 that forms the turbulent flow generation unit 74 and the shape of the concave portion 554 that forms the turbulent flow generation unit 55 are substantially elliptical. However, the present invention is not limited to this, and the shapes of the recesses 743 and 554 may be changed as appropriate.

FIG. 16 is a perspective view showing the liquid crystal panel 7 in which the shape of the recess 743 is different.
For example, the shape of the plurality of recesses 743 constituting the turbulent flow generation unit 74 may be a polygonal shape or a hexagonal shape as shown in FIG. In the recess 743 shown in FIG. 16, the inner diameter dimension in the + Y direction, which is the flow direction of the cooling air, is larger than the inner diameter dimension in the + X direction orthogonal to the + Y direction. However, the present invention is not limited thereto, and these inner diameter dimensions may be substantially the same, and the inner diameter dimension in the + Y direction may be smaller than the inner diameter dimension in the + X direction. In the example of FIG. 16, all the recesses 743 are formed such that the inner diameter dimension in the + Y direction is larger than the inner diameter dimension in the + X direction. However, the present invention is not limited to this, and the inner diameter dimension in the + Y direction of at least one recess 743 may be larger than the inner diameter dimension in the + X direction.
On the other hand, the shape of the at least one recess 743 may be a substantially oval shape, a substantially perfect circle shape, or a polygonal shape such as a regular triangle or a square (more specifically, a regular polygonal shape). In any of these cases, the inner diameter dimension in the + Y direction of the concave portion 743 may be larger or smaller than the inner diameter dimension in the + X direction. Furthermore, the recessed part 743 from which a dimension and a shape differ may be mixed.
The same applies to the incident-side polarizing plate 5 and other optical components to be cooled.

  In addition, when the inner diameter dimension in the + Y direction of the recesses 743 and 554 is the same as the inner diameter dimension in the + X direction or smaller than the inner diameter dimension in the + X direction, the inner diameter dimension in the + Y direction is larger than that in the case where the inner diameter dimension is larger. The flow resistance of the cooling air flowing through the recesses 743 and 554 is increased. For this reason, as described above, the inner diameter dimension in the + Y direction of the recesses 743 and 554 is preferably larger than the inner diameter dimension in the + X direction.

In the above embodiment, the cooling air sent out from the cooling device 8 (duct 85) flows along the light incident surface 7SA of the liquid crystal panel 7 and emits light from the incident side polarizing plate 5 (polarizing plate main body 51). Suppose that it circulates along the surface 51B. However, the present invention is not limited thereto, and the cooling air may be configured to flow along the light exit surface 7SB of the liquid crystal panel 7 and the light incident surface of the incident-side polarizing plate 5. Furthermore, the cooling air may be configured to flow along each of the light incident side surface and the light emission side surface of the optical component to be cooled.
In the above embodiment, the direction from the bottom surface portion 22 side to the top surface portion 21 side is the + Y direction, the + Y direction is the first direction, and the + X direction orthogonal to the + Y direction is the second direction. However, the present invention is not limited to this, and the first direction and the second direction orthogonal to the first direction may be changed as appropriate. That is, the flow direction of the cooling air is not limited to the + Y direction. For example, the cooling air flows in the + X direction, the inclined surface is positioned on the upstream side of the cooling air flow path with respect to the cooling portion, and the recesses are arranged on the inclined surface along the + Y direction orthogonal to the + X direction. It may be.

In the embodiment described above, the turbulent flow generation unit 74 has the intersecting surface 742 that intersects the inclined surface 741 and is a part of the light incident surface 7SA. Further, the turbulent flow generation unit 55 has an intersecting surface 552 that intersects with the first inclined surface 551 and is located on the same plane as the light emitting surface 51B. However, the present invention is not limited to this, and the intersecting surfaces 742 and 552 may be omitted. For example, the turbulent flow generation unit 74 is formed in a substantially triangular shape when viewed from the + X direction side, and has a configuration in which a concave portion is formed in a portion on the downstream side in the flow direction of the cooling air on the inclined surface along which the cooling air flows. May be.
In addition, the positions of the plurality of recesses included in the turbulent flow generation unit may be such that at least one of the plurality of recesses is located upstream from the downstream end in the cooling air flow direction on the inclined surface. . That is, all of the plurality of recesses may be located upstream from the end part, and some of the plurality of recesses may be located upstream from the end part. On the other hand, all of the plurality of recesses may be located on the downstream side of the end portion. In addition, as described above, at least one of the concave portion that is located upstream from the end portion and the concave portion that is located downstream from the end portion may be mixed.

  In the embodiment described above, the turbulent flow generation unit 74 is integrated with the holding member 72 (incident side holding frame 73), and the turbulent flow generation unit 55 is integrated with the holding member 52. However, the present invention is not limited thereto, and the member having the turbulent flow generation unit 74 may be provided separately from the holding member 72 (and thus the liquid crystal panel 7), and the member having the turbulent flow generation unit 55 is the holding member. 52 (and thus the incident-side polarizing plate 5) may be provided separately. That is, the turbulent flow generation units 74 and 55 do not have to be integrated with the holding members 72 and 52.

  In the embodiment described above, the distance between the centers of the recesses 743 is 1 mm, and 19 recesses 743 are formed at the intersection P2. However, the present invention is not limited to this, and the number of the recesses 743 may be changed as appropriate. In other words, the number of the recesses 743 may be appropriately increased or decreased according to the heat generation amount (specification) of the liquid crystal panel 7. Further, the dimensions of the recesses 743 may be changed as appropriate. The same applies to the recess 554.

In the said embodiment, the incident side polarizing plate 5 and the liquid crystal panel 7 were mentioned as an optical component of cooling object, and these shall have the turbulent flow generation parts 55 and 74. However, the present invention is not limited to this, and the turbulent flow generation unit may have only one of the incident side polarizing plate and the liquid crystal panel.
In addition, the cooling part in the liquid crystal panel 7 is an exposed part of the panel body 71, that is, an arrangement part of the dustproof member 732 inside the opening 731. However, the present invention is not limited to this, and the cooling part of the liquid crystal panel 7 may be anywhere as long as it is a part of the holding member 72 through which heat of the panel body 71 is conducted. Also in the incident side polarizing plate 5, as long as the heat | fever from the polarizing plate main body 51 is conducted, the cooling site | part may be anywhere.
Furthermore, other cooling objects may include a turbulent flow generation unit similar to the turbulent flow generation units 55 and 74. For example, an output-side polarizing plate 462 as a polarizing element that transmits light of a predetermined polarization direction and shields light of other polarization directions, a phase difference element that rotates the polarization direction of incident light, and the light source device 41 In addition, at least one of the polarization conversion element 433 arranged between the liquid crystal panel as the light modulation device and aligning the polarization direction of the incident light may have the turbulent flow generation unit. Further, the cooling target may be another optical component, and may be a configuration other than the optical component such as a control device or a power supply device, and the electronic device including the turbulent flow generation unit is not limited to the projector, Other electronic devices may be used.

In the above embodiment, the projector 1 includes the three liquid crystal panels 7 (7B, 7G, and 7R), each of which is a light modulation device. However, the present invention is not limited to this, and the present invention can also be applied to a projector including two or less or four or more liquid crystal panels.
Further, the projector 1 is provided with a transmissive liquid crystal panel 7 having a different light incident surface 7SA and light emitting surface 7SB as a light modulation device. However, the present invention is not limited to this, and a reflective liquid crystal panel having the same light incident surface and light emitting surface may be used as the light modulation device. In addition, as long as the light modulation device can modulate an incident light beam and form an image according to image information, a device using a micromirror, for example, a device using a DMD (Digital Micromirror Device) or the like can be used. A light modulation device may be used.

In the above embodiment, the image projection device 4 has a substantially L shape as shown in FIG. However, the present invention is not limited to this, and an image projection apparatus having another shape such as a substantially U shape may be employed.
In the above embodiment, the light source device 41 is configured to include the arc tube 411 and the reflector 412. However, the present invention is not limited to this, and the light source device may have a configuration having an LED (Light Emitting Diode) that is a solid light source, or a configuration having an LD (Laser Diode) that is also a solid light source and a wavelength conversion element. Further, the number of light source devices may be two or more.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 41 ... Light source device, 42 ... Image forming apparatus, 433 ... Polarization conversion element (optical component), 462 ... Output side polarizing plate (optical component), 48 ... Projection optical device, 5 ... Incident side polarizing plate (optical) Components, polarizing elements), 51 ... polarizing plate body (optical component body), 51A ... light incident surface (second surface), 51B ... light emitting surface (first surface, cooling part), 52 ... holding member, 55 ... disorder. Flow generating portion, 551 ... first inclined surface (inclined surface), 552 ... crossing surface, 554 ... recessed portion, 7 (7B, 7G, 7R) ... liquid crystal panel (optical component, light modulation device), 7SA ... light incident surface ( 1st surface), 7SB ... light emitting surface (second surface), 71 ... panel body (optical component body, cooling part), 72 ... holding member, 73 ... incident side holding frame, 731 ... opening, 732 ... dustproof member , 733 ... protrusions, 74 ... turbulent flow generation part, 741 ... inclined surface, 742 ... crossing Surface, 743 ... concave portion, 75 ... emission side holding frame, 8 ... cooling device, EP1, EP2 ... extended surface, FPC ... flexible printed circuit board, HM ... second support member, HM1 ... long hole, P1, P3 ... inclined base point, P2, P4 ... intersections.

Claims (7)

A light source device;
An image forming apparatus that forms an image with light emitted from the light source device;
A projection optical device for projecting the image formed by the image forming device;
In a cooling target having a first surface and a second surface facing each other, cooling air is circulated along a first direction from one end side to the other end side of the first surface to a cooling portion located on the first surface. A cooling device,
A turbulent flow generating portion that is located on the opposite side of the first direction with respect to the cooling portion and generates turbulent flow in the cooling air;
The turbulence generator is
An inclined surface that inclines in a direction closer to the first surface from the inclined base point located on the second surface side than the extended surface of the first surface toward the first direction;
A plurality of recesses located on the inclined surface and arranged along a second direction orthogonal to the first direction;
The image forming apparatus includes an optical component as the cooling target. The projector according to claim 1.
At least a part of each of the plurality of recesses is located on a side opposite to the first direction from an end of the inclined surface on the first direction side. The projector according to claim 2,
The turbulent flow generation unit is located on the same plane as the first surface, and has an intersecting surface that intersects the inclined surface,
The plurality of recesses are formed across a crossing portion between the inclined surface and the crossing surface. In the projector as described in any one of Claims 1-3,
Each of the plurality of recesses has an inner diameter dimension in the first direction larger than an inner diameter dimension in the second direction. The projector according to claim 4,
The projector according to claim 1, wherein the plurality of recesses are one of an elliptical shape and an elliptical shape. The projector according to any one of claims 1 to 5,
The optical component is
An optical component body;
A holding member for holding the optical component body,
The projector according to claim 1, wherein the turbulent flow generation unit is integrated with the holding member. The projector according to any one of claims 1 to 6,
The optical component is
A polarizing element that transmits light of a predetermined polarization direction and shields light of another polarization direction;
A phase difference element that rotates the polarization direction of incident light;
A light modulation device that modulates light emitted from the light source device;
A projector comprising: a polarization conversion element disposed between the light source device and the light modulation device and configured to align a polarization direction of incident light.

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