JP2005274744A - Optical apparatus and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical apparatus where an optical modulator and optical components arranged near the optical modulator can be efficiently cooled. <P>SOLUTION: The optical apparatus is provided with the optical modulator for modulating a luminous flux emitted from a light source in accordance with image information, an optical element arranged at a preceding stage or a post stage of the optical modulator so as to perform the optical conversion of the incident luminous flux, and a heat radiating member 9 attached to the optical modulator. The heat radiating member 9 is provided with a positioning part 91 contacting with either of the luminous flux incident side face or the luminous flux exit side face of the optical modulator in a thermal-conductive state and for positioning the member 9 on the optical modulator, and an extension part 92 extending from the end part of the positioning part to the optical element so as to cover the side face standing from the width direction end part of the luminous flux incident side face of the optical element. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a light modulation device that modulates a light beam emitted from a light source in accordance with image information, an optical element that is disposed in a front stage or a rear stage of the light modulation device, and that optically converts an incident light beam, and the light The present invention relates to an optical device including a heat dissipation member attached to a modulation device, and a projector including the optical device.

  Conventionally, projectors are used for presentations at conferences, academic conferences, exhibitions, etc., and for watching movies at home. Such a projector includes a light source therein, a light modulation device such as a liquid crystal panel that modulates light emitted from the light source into image information, and an optical device that includes a plurality of optical components that perform optical conversion of incident light. The optical apparatus forms an optical image and projects the enlarged image.

  In recent years, projectors have been improved in brightness and size, and accordingly, effective cooling means / cooling methods for optical components arranged therein have been studied. In particular, the polarizing plate, which is an optical component disposed in the vicinity of the light modulation device and the light modulation device, is likely to generate heat because the light beams emitted from the light source are radiated in a concentrated manner, and is susceptible to heat. In order to stabilize the formation, it was necessary to effectively cool the optical components such as the light modulator and the polarizing plate.

  For this reason, the structure of the optical apparatus which cools these light modulators and a polarizing plate by blowing cooling air from below with a ventilation fan is known (for example, refer patent document 1). In this optical device, cooling air is blown from below to the light modulation device and the polarizing plate to flow upward, and ascending air current of the cooling air whose temperature rises with the cooling of these optical components is generated, and the cooling air is below The optical modulator such as the light modulation device and the polarizing plate is cooled down.

JP 2000-10186 A

  However, in the optical device described in Patent Document 1, cooling air blown from below leaks from the width direction of the light modulation device and the polarizing plate, and the light modulation device and the polarizing plate are not efficiently cooled. There was a problem. That is, among the cooling air blown to cool the light modulation device and the polarizing plate, there is cooling air that leaks without cooling the light modulation device and the polarizing plate, so that efficient cooling is possible. There was a problem that it was not done.

  An object of the present invention is to provide an optical modulation device and an optical device that can improve the cooling efficiency of optical components arranged in the vicinity of the optical modulation device.

  An optical device of the present invention includes a light modulation device that modulates a light beam emitted from a light source according to image information, and an optical element that is disposed in a front stage or a rear stage of the light modulation device and performs optical conversion of an incident light beam. A heat dissipating member attached to the light modulation device, wherein the heat dissipating member is in contact with either the light incident side surface or the light emission side surface of the light modulation device in a heat conductive manner, And a positioning portion for positioning to the light modulation device, and a side surface extending from an end portion of the positioning portion toward the optical element and rising from a widthwise end portion of the surface on the light beam incident side of the optical element And an extending part that covers.

Here, examples of the optical element include a polarizing plate, a retardation plate, a color correction plate, and a viewing angle compensation plate.
According to the present invention, the extending portion provided in the heat radiating member covers the side surface in the width direction of the optical element disposed at the front stage or the rear stage of the light modulation device from the positioning portion that contacts the light modulation device. By the light modulation device, the optical element, and the heat radiating member, a cooling air flow path surrounded by four sides can be formed. This improves the ventilation of the cooling air that circulates through the cooling flow path and cools the light modulation device, the optical element, and the heat radiating member, and cools the light modulation device and the optical element without leaking the cooling air. Can be used. Moreover, the cooling air used for these cooling rises with heat. For this reason, the ventilation property of the above-mentioned cooling channel is further improved, and the circulation amount of the cooling air for cooling the light modulation device, the optical element and the heat radiating member can be increased. Therefore, it is possible to improve the cooling efficiency of these light modulation devices and optical elements.
In addition, since the heat generated in the light modulation device is conducted to the heat radiating member via the positioning portion that comes into contact with the light modulation device so as to be able to conduct heat, the heat radiation area for radiating the heat of the light modulation device can be expanded. . Thereby, the light modulation device can be effectively cooled.

In the present invention, two positioning portions of the heat radiating member are provided and are in contact with both ends of the same plane of the light modulation device, and the extending portion of the heat radiating member is on the light beam incident side of the light modulation device. It is preferable that the side surface rising from the end portion in the width direction of the surface is extended from each positioning portion toward the optical element.
According to the present invention, the positioning surface of the heat radiating member is brought into contact with either end of either the light beam incident side surface or the light beam emission side surface of the light modulation device. The light modulation device can be directly blown. Moreover, since the extending part of the heat radiating member covers the side surface rising from the end in the width direction of the light modulation device, the cooling air that cools the light modulation device, the optical element, and the heat radiation member is also blown to the side surface. Thereby, since the area of the light modulation device cooled by the cooling air can be increased, the light modulation device can be cooled more effectively.

In the present invention, the heat dissipating member includes a connecting portion that connects the positioning portions, and the connecting portion is formed according to the shape of the upper surface of the light modulation device, and the lower surface of the connecting portion is It is preferable that the light modulator is brought into contact with the upper surface.
According to the present invention, since the connecting portion that is formed in accordance with the shape of the top surface of the light modulation device and connects the two positioning portions is attached to the top surface of the light modulation device, it is easy to attach the light modulation device to the heat radiating member. It can be carried out. That is, the extending portion is opposed to the side surface rising from the end in the width direction of the light modulation device, and the lower surface of the connecting portion is brought into contact with the upper surface of the light modulation device from above the light modulation device. Thus, a heat radiating member can be attached to the light modulation device. Therefore, it is possible to easily attach the heat radiating member, and it is possible to attach the heat radiating member to the existing light modulation device.
Further, since the connecting portion of the heat radiating member is brought into contact with the upper surface of the light modulation device, the heat radiating area of the light modulation device can be expanded, so that the light modulation device can be cooled more effectively.

Alternatively, in the present invention, it is preferable that the positioning portion of the heat radiating member is formed with an opening through which the light beam passes at a position substantially coincident with the light beam incident surface or the light beam emission surface of the light modulation device.
According to the present invention, the positioning portion of the heat radiating member transmits heat to the heat radiating member from the light incident side surface or the light beam emission side surface having the largest area in the light modulation device. Can be easily conducted to the heat dissipation member. Therefore, the thermal conductivity of the light modulation device to the heat radiating member can be improved, and the cooling efficiency of the light modulation device can be improved.

In the present invention, the extending portion of the heat radiating member covers a side surface that rises from the widthwise end portion of the surface on the light beam incident side of the light modulation device, and the lower end of the extending portion is in a direction close to each other, In addition, it is preferable that a first guide portion that extends downward and guides air to the light modulation device is formed.
According to the present invention, the extending portion of the heat radiating member covers the side surface rising from the end in the width direction of the light modulation device. Therefore, cooling air for cooling the light modulation device, the optical element, and the heat radiating member is applied to the side surface. Can blow. Thereby, since the area of the light modulation device to which the cooling air is blown can be expanded, the light modulation device can be effectively cooled.
Further, since the first guide portion is formed at the lower end of the extending portion of the heat radiating member, the cooling air that is blown from below the light modulation device and cools the light modulation device, the optical element, and the heat radiating member is provided. , It can be circulated through the cooling flow path without leakage. Therefore, it is possible to further improve the air permeability of the air that cools the light modulation device and the optical element, and it is possible to effectively cool the light modulation device and the optical element.

In the present invention, the lower end of the positioning portion of the heat radiating member is formed with a second guide portion that extends downward along the forming direction of the positioning portion and guides air to the light modulation device. preferable.
According to the present invention, it is possible to achieve substantially the same effect as the heat radiating member on which the first guide portion described above is formed. That is, since it is possible to easily introduce cooling air for cooling the cooling flow path formed by the light modulation device, the optical element, and the heat dissipation member, the cooling efficiency of the light modulation device, the optical element, and the heat dissipation member can be improved. Can be improved.
Further, in the case where the heat radiation member is provided with the second guide portion and the first guide portion described above, these actions work synergistically, so that the cooling efficiency of the light modulation device, the optical element, and the heat radiation member is increased. This can be further improved.

  A projector according to the present invention is a projector that modulates a light beam emitted from a light source according to image information to form an optical image, and enlarges and projects the optical image, and includes the above-described optical device. It is characterized by.

  According to the present invention, it is possible to achieve substantially the same effect as the above-described optical device. That is, by providing the heat dissipation member, it is possible to improve the cooling efficiency of the light modulation device provided in the optical device and the optical element arranged in the front stage or the rear stage of the light modulation device, and the optical image Formation can be stabilized.

In this invention, it is preferable to provide the cooling means which blows cooling air along the surface of the said optical modulation apparatus and an optical element inside the said heat radiating member.
According to the present invention, the cooling air blown from the cooling means is circulated through the cooling passages of the light modulation device, the optical element, and the heat dissipation member, which are formed by the extending portions of the light modulation device, the optical element, and the heat dissipation member. It can be made easier. Thereby, the circulation amount of the cooling air flowing through the cooling flow path can be increased, and the light modulation device and the optical element can be more effectively cooled.
Moreover, when the 1st guide part and / or the 2nd guide part are formed in the heat radiating member, the loss amount at the time of the cooling air supplied from a cooling means distribute | circulating to a cooling flow path is further reduced. Therefore, almost all of the cooling air supplied from the cooling means can be used for cooling the light modulation device and the optical element. Therefore, the light modulation device and the optical element can be cooled more efficiently.

[1. First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
(1) External Configuration FIGS. 1 and 2 show a projector 1 according to a first embodiment of the present invention. FIG. 1 is a perspective view seen from the upper front side, and FIG. 2 is a lower rear side. It is the perspective view seen from.
This projector 1 is an optical device that modulates a light beam emitted from a light source in accordance with image information and enlarges and projects it onto a projection surface such as a screen, and houses an apparatus main body including an optical system to be described later. 2 and a projection lens 3 exposed from the exterior case 2.
The projection lens 3 has a function as a projection optical system for enlarging and projecting an optical image formed by modulating a light beam emitted from a light source by a liquid crystal panel as a light modulation device to be described later according to image information. It is configured as a combined lens in which a plurality of lenses are housed inside a cylindrical body.

  The exterior case 2 as a housing has a wide rectangular parallelepiped shape in which the dimension in the width direction orthogonal to the projection direction is larger than the dimension in the projection direction, and an upper case 21 that covers the upper part of the apparatus body and a lower that covers the lower part of the apparatus body A case 22 and a front case 23 covering the front portion of the apparatus main body are provided. Each of these cases 21 to 23 is an integrally molded product made of synthetic resin molded by injection molding or the like.

The upper case 21 includes an upper surface portion 21A that covers the upper portion of the apparatus main body, side surface portions 21B and 21C that are substantially suspended from the widthwise end portion of the upper surface portion 21A, and a rear surface portion 21D that is substantially suspended from the rear end portion of the upper surface portion 21A. And.
An operation panel 24 for starting up and adjusting the projector 1 is provided on the front side in the projection direction of the upper surface portion 21A. The operation panel 24 includes a plurality of switches including a start switch and image / sound adjustment switches. When projecting by the projector 1, the operation panel 24 is operated to adjust image quality / volume, etc. It can be performed.

In addition, a plurality of holes 241 are formed next to the operation panel 24 on the upper surface portion 21A, and a sound output speaker is accommodated in the inside, though not shown.
The operation panel 24 and the speaker are electrically connected to a control board constituting an apparatus main body, which will be described later, and an operation signal from the operation panel 24 is processed by the control board.
The back surface portion 21D is formed with a recess notched on the upper surface portion 21A side in a substantially central portion, and a connector group 25 provided on an interface board connected to a control board described later is exposed in this recess. .

  The lower case 22 is configured substantially symmetrically about the engagement surface with the upper case 21, and includes a bottom surface portion 22A, side surface portions 22B and 22C, and a back surface portion 22D. The side surface portions 22B and 22C and the back surface portion 22D are engaged with the side surface portions 21B and 21C of the upper case 21 and the lower end portion of the back surface portion 21D at the upper end portions thereof, and the side surface portions and the back surface portions of the exterior case 2 are Constitute.

On the bottom surface portion 22A, a fixed leg portion 26 is provided at substantially the center on the rear end side of the projector 1, and adjustment legs 27 are provided at both ends in the front end side width direction.
The adjustment leg portion 27 is constituted by a shaft-like member that protrudes from the bottom surface portion 22 </ b> A so as to advance and retreat in the out-of-plane direction, and the shaft-like member itself is housed in the exterior case 2. Such an adjustment leg 27 can adjust the advance / retreat amount from the bottom surface portion 22 </ b> A by operating an adjustment button 271 provided on the side surface portion of the projector 1.
As a result, the vertical position of the projected image emitted from the projector 1 can be adjusted, and the projected image can be formed at an appropriate position.

In addition, openings 28, 29, and 30 that communicate with the inside of the exterior case 2 are formed in the bottom surface portion 22 </ b> A.
The opening 28 is a part where a light source device including the light source of the projector 1 is attached and detached, and is normally closed by a lamp cover 281.
The openings 29 and 30 are configured as slit-like openings.
The opening 29 is an intake opening for taking in cooling air for cooling an optical device including a liquid crystal panel as a light modulation device that modulates a light beam emitted from a light source lamp according to image information.
The opening 30 is an intake opening for taking in cooling air for cooling the power supply unit and the light source drive circuit that constitute the apparatus main body of the projector 1.
Since the openings 29 and 30 are always in communication with the interior of the projector 1 at the slit-shaped opening, dustproof filters are provided on the inner sides of the openings 29 and 30 so that dust and the like do not enter the interior.

  Furthermore, the bottom surface portion 22A is provided with a lid member 31 that is slidably attached to the bottom surface portion 22A so as to be slidable outward. A remote controller for remotely operating the projector 1 is provided inside the lid member 31. Is to be stored. Note that a remote controller (not shown) is provided with the same start switch, adjustment switch, etc. provided on the operation panel 24 described above. When the remote controller is operated, an infrared signal corresponding to this operation is sent from the remote controller. The output infrared signal is processed by the control board via the light receiving portions 311 provided on the front surface and the back surface of the outer case.

  Similar to the case of the upper case 21, the back surface portion 22 </ b> D is formed with a recess notched on the bottom surface portion 22 </ b> A side at a substantially central portion, exposing the connector group 25 provided on the interface board, and An opening 32 is also formed in the vicinity of the opening, and the inlet connector 33 is exposed from the opening 32. The inlet connector 33 is a terminal that supplies power to the projector 1 from an external power supply, and is electrically connected to a power supply unit described later.

The front case 23 includes a front surface portion 23A and an upper surface portion 23B, and engages with the projection direction front end portions of the upper case 21 and the lower case 22 described above on the rear end side in the projection direction of the upper surface portion 23B.
The front surface portion 23A is formed with a substantially circular opening 34 for exposing the projection lens 3 and an opening 35 composed of a plurality of slits formed adjacent thereto.

The opening 34 is further opened on the upper surface side, a part of the lens barrel of the projection lens 3 is exposed, and the zoom / focus adjustment knobs 3A and 3B provided around the lens barrel are operated from the outside. Can be done.
The opening 35 is configured as an exhaust opening that discharges air that has cooled the apparatus main body, and the air that has cooled the optical system, the control system, and the power supply unit / lamp driving unit, which are constituent members of the projector 1 described later, The liquid is discharged from the opening 35 in the projection direction of the projector 1.

(2) Internal Configuration As shown in FIGS. 3 to 5, the apparatus main body of the projector 1 is accommodated in the exterior case 2, and the apparatus main body includes the optical unit 4 (see FIGS. 3 and 5). 4), a control board 5 (FIG. 4), a power supply block 6 (FIG. 4), and a cooling unit 7 (FIGS. 3 and 4).
(2-1) Structure of the optical unit 4 The optical unit 4 as an optical system modulates the light beam emitted from the light source device according to image information to form an optical image, and then forms an optical image on the screen via the projection lens 3. A projection image is formed, and the light source device, various optical components, and the like are incorporated in the optical component casing 40 shown in FIG.
The optical component housing 40 includes a component storage member 401 and a lid-like member (not shown in FIG. 4), each of which is a synthetic resin product by injection molding or the like.

The component storage member 401 is formed in a container shape in which an upper portion including a bottom surface portion 401A and a side wall portion 401B for storing optical components is opened, and the side wall portion 401B is provided with a plurality of groove portions 401C. Various optical components constituting the optical unit 4 are mounted in the groove 401C, whereby each optical component is accurately arranged on the illumination optical axis set in the optical component casing 40. The lid member has a planar shape corresponding to the component storage member 401 and closes the upper surface of the component storage member 401.
Further, a front wall in which a circular opening is formed is provided at the light beam exit side end of the bottom surface portion 401A of the component storage member 401, and the base end portion of the projection lens 3 is provided on this front wall. Bonded and fixed.

As shown in FIG. 5, the optical component casing 40 includes an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, a light modulation optical system, and a color synthesis optical system. Functionally divided into an integrated optical device 44. The optical unit 4 in this example is employed in a three-plate projector, and is a spatial color separation type that separates white light emitted from a light source in an optical component housing 40 into three color lights. It is configured as an optical unit.
The integrator illumination optical system 41 is an optical system for making the luminous flux emitted from the light source uniform in the illumination optical axis orthogonal plane, and includes a light source device 411, a first lens array 412, a second lens array 413, and a polarization. A conversion element 414 and a superimposing lens 415 are provided.

  The light source device 411 includes a light source lamp 416 as a radiation light source and a reflector 417, and the radial light beam emitted from the light source lamp 416 is reflected by the reflector 417 to be a substantially parallel light beam and emitted to the outside. In this example, a high-pressure mercury lamp is employed as the light source lamp 416, but a metal halide lamp or a halogen lamp may be employed in addition to this. In this example, a parabolic mirror is used as the reflector 417, but a configuration in which a collimating concave lens is arranged on the exit surface of the reflector made of an ellipsoidal mirror can also be used.

The first lens array 412 has a configuration in which small lenses having a substantially rectangular outline when viewed from the illumination optical axis direction are arranged in a matrix. Each small lens splits the light beam emitted from the light source lamp 416 into partial light beams and emits them in the direction of the illumination optical axis. The contour shape of each small lens is set so as to be substantially similar to the shape of an image forming area of a light modulation device 441 described later.
The second lens array 413 has substantially the same configuration as the first lens array 412, and includes a configuration in which small lenses are arranged in a matrix. The second lens array 413 has a function of forming an image of each small lens of the first lens array 412 on the light modulation device 441 together with the superimposing lens 415.

The polarization conversion element 414 converts the light from the second lens array 413 into one type of polarized light, thereby increasing the light utilization rate in the optical device 44.
Specifically, each partial light beam converted into one type of polarized light by the polarization conversion element 414 is finally substantially superimposed on the light modulation device 441 of the optical device 44 by the superimposing lens 415. In a projector using a light modulation device 441 that modulates polarized light, only one type of polarized light can be used, and therefore approximately half of the light flux from the light source lamp 416 that emits randomly polarized light is not used. For this reason, by using the polarization conversion element 414, all the light beams emitted from the light source lamp 416 are converted into one kind of polarized light, and the light use efficiency in the optical device 44 is enhanced. Note that. Such a polarization conversion element 414 is introduced in, for example, JP-A-8-304739.

The color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423, and a plurality of partial light beams emitted from the integrator illumination optical system 41 by the dichroic mirrors 421 and 422 are red (R) and green. (G) and blue (B) have a function of separating into three color lights.
The relay optical system 43 includes an incident side lens 431, a relay lens 433, and reflection mirrors 432 and 434, and has a function of guiding red light, which is color light separated by the color separation optical system 42, to the light modulation device 441R. doing.

  At this time, the dichroic mirror 421 of the color separation optical system 42 transmits the red light component and the green light component and reflects the blue light component of the light beam emitted from the integrator illumination optical system 41. The blue light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 418, and reaches the blue light modulation device 441B. The field lens 418 is a collimating lens that converts each partial light beam emitted from the second lens array 413 into a light beam parallel to the central axis (principal ray). The same applies to the field lens 418 provided on the light incident side of the other light modulation devices 441G and 441R.

Of the red light and green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422, passes through the field lens 418, and reaches the green light modulation device 441G. On the other hand, the red light passes through the dichroic mirror 422, passes through the relay optical system 43, passes through the field lens 418, and reaches the light modulator 441R for red light.
The relay optical system 43 is used for red light because the optical path length of the red light is longer than the optical path lengths of the other color lights, thereby preventing a decrease in light use efficiency due to light divergence or the like. Because. That is, this is to transmit the partial light beam incident on the incident side lens 431 to the field lens 418 as it is. The relay optical system 43 is configured to pass red light of the three color lights, but is not limited thereto, and may be configured to pass blue light, for example.

  The optical device 44 modulates an incident light beam according to image information to form a color image, and includes three polarizing plates 442 on which the respective color lights separated by the color separation optical system 42 are incident, Light modulators 441R, 441G, 441B disposed at the subsequent stage of the polarizing plate 442, an optical conversion plate 443 disposed at the subsequent stage of each of the light modulators 441R, 441G, 441B, and a cross dichroic prism 444 as a color synthesis optical system. With.

The light modulation devices 441R, 441G, and 441B include liquid crystal panels 441R1, 441G1, and 441B1, respectively. The liquid crystal panels 441R1, 441G1, and 441B1, for example, use polysilicon TFTs as switching elements. Although not shown in FIG. 5, the liquid crystal is hermetically sealed in a pair of opposed transparent substrates. The panel body is housed in holding frames 447A and 447B (see FIG. 8).
In the optical device 44, each color light separated by the color separation optical system 42 is modulated in accordance with image information by these three light modulation devices 441R, 441G, 441B, a polarizing plate 442, and an optical conversion plate 443, and an optical image is obtained. Form.

  The polarizing plate 442 transmits only polarized light in a certain direction out of each color light separated by the color separation optical system 42 and absorbs other light beams. A polarizing film is attached to a substrate such as sapphire glass. Is. Further, the polarizing film may be attached to the field lens 418 without using the substrate.

The optical conversion plate 443 includes a first optical conversion plate 443A and a second optical conversion plate 443B.
The first optical conversion plate 443A has substantially the same function as the polarizing plate 442 described above, and transmits only polarized light in a predetermined direction among incident light beams and absorbs other light beams. The polarization axis of the polarized light transmitted through the first optical conversion plate 443A is set to be orthogonal to the polarization axis of the polarized light transmitted through the polarizing plate 442.

Such a first optical conversion plate 443A has a substrate 443A1 (see FIG. 8) and a polarizing film 443A2 (see FIG. 8) attached to the light beam incident side end surface of the substrate 443A1 in a state where the polarization axis is in a predetermined direction. ).
The substrate 443A1 is a rectangular plate made of quartz. The substrate 443A1 has a thermal conductivity of 9.3 W / (m · K) in the optical axis direction and a thermal conductivity of 5.4 W (m · K) in a direction perpendicular to the optical axis. Note that the substrate 443A1 may be formed using sapphire glass, quartz, fluorite, or the like in addition to quartz.
The polarizing film 443A2 is a rectangular film. After the iodine is adsorbed and dispersed in polyvinyl alcohol (PVA) to form a film, the film is stretched in a certain direction, and then the stretched film It is formed by laminating an acetate cellulose film on both surfaces with an adhesive.

  Similarly to the first optical conversion plate 443A, the second optical conversion plate 443B transmits only polarized light in a predetermined direction out of the light beams emitted from the light modulation device 441 (441R, 441G, 441B), and other light beams. And the viewing angle of the light beam emitted from the light modulation device 441 (441R, 441G, 441B) is expanded.

The second optical conversion plate 443B is attached to the substrate 443B1 (see FIG. 8), the polarizing film 443B2 (see FIG. 8) attached to the end surface on the light emission side of the substrate 443B1, and the end surface on the light incident side of the substrate 443B1. Viewing angle compensation film 443B3 (see FIG. 8).
The substrate 443B1 is the same as the substrate 443A1 of the first optical conversion plate 443A described above.
The polarizing film 443B2 is similar to the polarizing film 443A2 described above, but has different light absorption characteristics. The polarizing film 443B2 is attached to the end surface of the substrate 443B1 on the light beam exit side in a state where the polarization axis is parallel to the polarizing film 443A2.
The viewing angle compensation film 443B3 compensates for the birefringence generated by the light modulation device 441 (441R, 441G, 441B), and the viewing angle of the optical image formed by the light modulation device 441 (441R, 441G, 441B) is expanded. In addition, the contrast of the projected image is improved.

The cross dichroic prism 444 forms a color image by combining optical images emitted from the optical conversion plate 443 and modulated for each color light.
The cross dichroic prism 444 is provided with a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light in a substantially X shape along the interface of four right-angle prisms. Three color lights are synthesized by the multilayer film.
Such an optical device 44 is configured as a unit, is disposed in front of the optical path of the projection lens 3 of the optical component housing 40 described above, and is fixed to the bottom surface of the component storage member 401 with screws. The unitized structure of the optical device 44 will be described in detail later.

(2-2) Structure of Control Board 5 As shown in FIG. 3, the control board 5 is arranged so as to cover the upper side of the optical unit 4, and a main board 51 on which an arithmetic processing unit and a liquid crystal panel driving IC are mounted. And an interface board 52 that is connected on the rear end side of the main board 51 and stands on the back surface portions 21D and 22D of the exterior case 2.
The connector group 25 described above is mounted on the back side of the interface board 52, and image information input from the connector group 25 is output to the main board 51 via the interface board 52.

The arithmetic processing unit on the main substrate 51 performs arithmetic processing on the input image information, and then outputs a control command to the liquid crystal panel driving IC. The driving IC generates and outputs a driving signal based on this control command to drive the liquid crystal panels 441R1, 441G1, 441B1 of the light modulation devices 441R, 441G, 441B, thereby performing light modulation according to the image information. Thus, an optical image is formed.
Such a main substrate 51 is covered with a sheet metal 53 obtained by bending a punching metal, and this sheet metal 53 is provided to prevent EMI (electromagnetic interference) due to circuit elements or the like on the main substrate 51.

(2-3) Structure of the power supply block 6 Although not shown, the power supply block 6 includes a power supply and a lamp driving circuit (ballast) disposed below the power supply.
The power supply supplies power supplied from the outside through a power cable (not shown) connected to the inlet connector to the lamp driving circuit, the control board 5 and the like.
The lamp driving circuit supplies power supplied from a power source to the light source lamp 416 constituting the optical unit 4 and is electrically connected to the light source lamp. Such a lamp driving circuit can be configured by wiring to a substrate, for example.

(2-4) Structure of the cooling unit 7 As shown in FIG. 3 and FIG. 4, the cooling unit 7 as a cooling means includes two sirocco fans 71 and 72 that are opposed to each other across the projection lens 3, and a duct. 73 and an air guide plate 74 (not shown in FIGS. 3 and 4; see FIGS. 13 and 14).
The sirocco fan 71 is disposed on the side surface portion 22 </ b> C side of the lower case 22, and the sirocco fan 72 is disposed approximately at the front center of the lower case 22 with the projection lens 3 interposed therebetween. These sirocco fans 71, 72 send the air outside the projector 1 sucked through the opening 29 to the duct 73 and the air guide plate 74 arranged below the optical device 44, so that the optical device 44 is viewed from below. Cooling.
The structure of the duct 73 and the air guide plate 74 will be described in detail later.

(3) Structure of Optical Device 44 FIGS. 6 and 7 are perspective views of the optical device 44. More specifically, FIG. 6 shows a perspective view of the optical device 44 when the light modulation device 441B is viewed from the upper side to the left hand, and FIG. 7 shows the light modulation device 441B viewed from the lower side to the right hand. A perspective view of the optical device 44 is shown. FIG. 8 is an exploded perspective view of the optical device 44. In FIG. 8, for the sake of simplicity, only the configuration of the light beam incident surface on which red light is incident is shown, and the description and illustration of other light beam incident surfaces are omitted, but the light beam incident on which green light is incident. The surface and the light beam incident surface on which blue light is incident have substantially the same configuration.

  As shown in FIGS. 6 to 8, the optical device 44 has optical modulators 441R, 441G, 441B and optical conversion on three surfaces, which are the light incident surfaces of the cross dichroic prism 444, centering on the cross dichroic prism 444. A plate 443 (not shown in FIGS. 6 and 7) is attached. Further, the cross dichroic prism 444 is placed on the prism base 445, and a heat dissipation block 446 is placed on the upper surface of the cross dichroic prism 444. Thus, the optical device 44 is configured as a unit including these.

Hereinafter, the structure of the optical device 44 will be described with reference to FIGS. The arrows X, Y, and Z shown in FIGS. 8 to 12 indicate the same direction. Specifically, the Z-axis direction indicates the illumination optical axis direction, the X-axis direction indicates the width direction, and the Y-axis direction indicates the height direction.
As shown in FIG. 8, on the red light incident surface of the cross dichroic prism 444, the first optical conversion plate 443A, the thermally conductive holding member 448, and the second optical are arranged in order from the side closer to the cross dichroic prism 444. A conversion plate 443B, a light modulation device 441R, and a heat radiating member 9 are disposed.

  The first optical conversion plate 443A is an ultraviolet curable adhesive or the like so that the optical axis of the substrate 443A1 of the first optical conversion plate 443A faces the width direction (X-axis direction) on the light incident surface of the cross dichroic prism 444. Is fixed by adhesion. The outer dimension of the first optical conversion plate 443A is formed to be substantially the same as the dimension of the light incident surface of the cross dichroic prism 444. The first optical conversion plate 443A is exposed from an opening 448A1 (see FIG. 9) formed in the holding member 448.

FIG. 9 shows a perspective view of the holding member 448.
As shown in FIGS. 8 and 9, the holding member 448 has a substantially rectangular shape when viewed from the illumination optical axis direction (Z-axis direction), and is formed by processing a metal flat plate such as aluminum. As shown in FIG. 9, the heat conductive holding member 448 has a substantially rectangular plate-like portion 448 </ b> A and the plate-like portion 448 </ b> A facing each other in the out-of-plane direction from both ends in the width direction (X axis direction). Side portions 448B that stand up so as to extend, and extending portions 448C that extend substantially vertically from both ends in the height direction (Y-axis direction) of the side portions 448B toward the substantially center of the holding member 448. .

  A substantially rectangular opening 448A1 is formed substantially at the center of the plate-like portion 448A. The dimension of the opening 448A1 is substantially the same as or slightly larger than the outer dimension of the substrate 443A1 of the first optical conversion plate 443A. As a result, the substrate 443A1 of the first optical conversion plate 443A can be fitted into the opening 448A1. When the first optical conversion plate 443A is fitted in the opening 448A1, the surface on the light beam incident side of the first optical conversion plate 443A and the surface on the light beam incident side of the plate-like portion 448A are the same plane. It is comprised so that. That is, the protruding amount of the first optical conversion plate 443A with respect to the plate-like portion 448A is substantially the same as the dimension in the thickness direction (Z-axis direction) of the plate-like portion 448A.

  In addition, pasting portions 448A2 and 448A4 are formed at both ends in the height direction of the plate-like portion 448A. These affixing portions 448A2 and 448A4 are portions that affix the plate-like portion 448A to the heat dissipating block 446 and the prism base 445 disposed above and below the cross dichroic prism 444 so as to allow heat conduction. Notches 448A3 and 448A5 for absorbing a difference in hot behavior are formed toward the opening 448A1 at substantially the center of the upper end of the pasting portion 448A2 and the lower end of the pasting portion 448A4.

  In the side surface portion 448B, two protrusions 448B1 each having a substantially rectangular shape in plan view are formed on the surfaces of the side surface portions 448B facing each other. The protruding portion 448B1 is formed closer to the center than the extending portion 448C formed extending from both ends in the height direction. The surface on the light beam incident side of the protrusion 448B1 is in contact with the surface on the light beam emission side of the second optical conversion plate 443B attached to the extending portion 448C. Accordingly, the second optical conversion plate 443B in the holding member 448 is positioned in the illumination optical axis direction (Z-axis direction).

The extending portions 448C are respectively formed at the four corner portions when the holding member 448 is viewed from the illumination optical axis direction.
Of the surfaces formed in these extending portions 448C, the surfaces facing each other in the height direction (Y-axis direction) are substrate mounting surfaces 448C1 to which the substrate 443B1 of the second optical conversion plate 443B is mounted. The surface of the second optical conversion plate 443B that stands up from the end in the height direction of the substrate 443B1 (FIG. 8) is bonded and fixed to the substrate mounting surface 448C1 so as to allow heat conduction. Here, the polarization axis of the polarizing film 443A2 in the first optical conversion plate 443A fitted in the opening 448A1 of the plate-like portion 448A and the second optical conversion plate fitted in the substrate mounting surface 448C1 of the extension portion 448C. The second optical conversion plate 443B is attached so that the polarization axis of the polarizing film 443B2 at 443B is parallel. Further, the optical conversion plate 443 is arranged so that the polarization axes of the polarizing films 443A2 and 443B2 are orthogonal to the polarizing axis of the polarizing film in the polarizing plate 442 described above.
Further, a pin spacer 449 (see FIG. 8) for positioning and holding the light modulation device 441R (441G, 441B) is bonded and fixed to the surface 448C2 on the light beam incident side of the extending portion 448C so as to be thermally conductive. .

According to such a holding member 448, the heat generated in the first optical conversion plate 443A and the second optical conversion plate 443B is conducted to the heat dissipated to the holding member 448, so that the cooling efficiency of the optical conversion plate 443 is improved. it can.
In addition, a predetermined interval is generated between the first optical conversion plate 443A fitted into the opening 448A1 of the plate-like portion 448A and the second optical conversion plate 443B held by the extension portion 448C. In addition, the width direction of this space is surrounded by the side surface portion 448B of the holding member 448. According to this, the cylindrical flow path of the cooling air for cooling the light beam incident surface of the first optical conversion plate 443A and the light beam emission surface of the second optical conversion plate 443B can be formed. Therefore, the first optical conversion plate 443A and the second optical conversion plate 443B can be effectively cooled.
The holding member 448 may be made of electrogalvanized steel plate or the like in addition to aluminum, and is formed by injection molding or the like, a synthetic resin having high thermal conductivity, an iron-nickel alloy such as invar, magnesium, etc. You may comprise from molded articles, such as an alloy and an aluminum alloy.

As shown in FIG. 8, the pin spacer 449 is a rod-shaped member made of a heat conductive synthetic resin. As described above, the pin spacer 449 is attached to the surface 448C2 on the light beam incident side of the extending portion 448C formed in the holding member 448. The pin spacer 449 is inserted through a hole 447B3 formed in the light modulation device 441R (441G, 441B), and holds the light modulation device 441.
Note that the pin spacer 449 is not limited to a heat conductive synthetic resin, and may be formed of optical glass, quartz, sapphire, quartz, fluorite, or the like. Moreover, you may comprise with members with high heat conductivity, such as a metal.

The light modulation device 441R (441G, 441B) includes a liquid crystal panel 441R1 (441G1, 441B1) serving as a light modulation element, and a holding frame 447 that holds the liquid crystal panel 441R1 (441G1, 441B1) from the light beam incident side and the light beam emission side. It has.
As described above, the liquid crystal panel 441R1 (441G1, 441B1) modulates an incident light beam according to image information. The liquid crystal panel 441R1 is provided with a control cable 441R2 (see FIGS. 6 and 7 for the 441G2 and 441B2) extending upward (Y-axis direction), and the control cable 441R2 (441G2, 441B2) is connected to the liquid crystal panel 441R1. To the control board 5 described above.

The holding frame 447 includes a first holding frame 447A that holds the liquid crystal panel 441R1 (441G1, 441B1) from the light beam incident side, and a second holding frame 447B that holds the liquid crystal panel 441R1 (441G1, 441B1) from the light beam emission side.
The first holding frame 447A is formed in a substantially convex shape when viewed from the illumination optical axis direction (Z-axis direction) and is formed in a substantially U-shaped cross section. It is a member that houses the surface on the light beam incident side of 441R1 (441G1, 441B1).
The first holding frame 447A is formed with a substantially rectangular opening 447A1, fins 447A2, and hooks 447A3.

  The opening 447A1 is formed substantially at the center of the first holding frame 447A. The formation position of the opening 447A1 corresponds to the panel surface of the liquid crystal panel 441R1 (441G1, 441B1), and the liquid crystal panel 441R1 (441G1, 441B1) is exposed from the opening 447A1. Since the red light (green light and blue light) separated by the above-described color separation optical system is incident on the liquid crystal panel 441R1 (441G1, 441B1) through the opening 447A1, this portion becomes an image forming region.

  A plurality of fins 447A2 are formed in the upper center of the opening 447A1 in a concave shape upward from the opening 447A1. The fin 447A2 is a portion for increasing the contact area with air and dissipating heat when heat generated in the liquid crystal panel 441R1 (441G1, 441B1) housed inside is conducted to the first holding frame 447A. It is.

  The hook 447A3 is formed substantially at the center of the surface rising in the illumination optical axis direction (Z-axis direction) from both ends in the width direction (X-axis direction) of the surface of the first holding frame 447A on the light beam incident side. The hook 447A3 is formed with a convex protrusion at substantially the center, and this protrusion is fitted to a hook fitting part 447B2 formed on the second holding frame 447B.

The second holding frame 447B is formed in a substantially rectangular shape in plan view. The second holding frame 447B is formed with an opening 447B1, a hook fitting portion 447B2, and a hole 447B3.
Similarly to the first holding frame 447A, the opening 447B1 is located at a position substantially corresponding to the panel surface of the liquid crystal panel 441R1 (441G1, 441B1) of the light modulation device 441 (441G, 441B) at the approximate center of the second holding frame 447B. Is formed.
The hook fitting portion 447B2 is formed to stand upright in a direction opposite to the illumination optical axis direction (Z-axis direction) from a substantially central portion at both ends in the width direction (X-axis direction) of the second holding frame 447B. A rectangular opening is formed at substantially the center of the hook fitting portion 447B2, and the protrusion formed on the hook 447A3 of the first holding frame 447A is fitted into the opening, and the first holding frame is formed. 447A and the second holding frame 447B are fixed.
The holes 447B3 are formed at the four corners when viewed from the illumination optical axis direction of the second holding frame 447B. These holes 447B3 are burring holes formed so that the inner peripheral edge protrudes in a direction opposite to the illumination optical axis direction (Z-axis direction). After the pin spacer 449 is inserted into these holes 447B3 and the position is adjusted, the second holding frame 447B is fixed to the pin spacer 449 with an adhesive or the like.

  By such a light modulation device 441R, heat generated in the liquid crystal panel 441R1 (441G1, 441B1) is conducted to the holding frame 447 configured by the first holding frame 447A and the second holding frame 447B. Further, the heat conducted to the holding frame 447 is radiated by the holding frame 447 and is conducted to the holding member 448 through the pin spacer 449 to be radiated. Thereby, the area which dissipates the heat of liquid crystal panel 441R1 (441G1, 441B1) can be expanded. Accordingly, the liquid crystal panel 441R1 (441G1, 441B1) can be effectively cooled, the product life can be extended by suppressing breakage, deterioration, and the like, and optical image formation can be stabilized.

  Note that the above-described holding frame 447 can be formed by molding or sheet metal processing. In addition, as the material, a member having high thermal conductivity, for example, a metal such as Invar and nickel-iron alloy such as 42Ni-Fe, magnesium alloy, aluminum alloy, carbon steel, stainless steel, carbon fiber, carbon nanotube, etc. It is possible to employ a resin (polycarbonate, polyphenylene sulfide, liquid crystal resin, etc.) mixed with carbon filler.

FIG. 10 is a perspective view of the heat dissipation member 9.
The heat radiating member 9 is attached to the above-described light modulation device 441R (441G, 441B), dissipates heat generated by the light modulation device 441R (441G, 441B), and also the light modulation device 441R (441G, 441B). And an aluminum member that covers a side surface rising from an end portion in the width direction (X-axis direction) of the optical conversion plate 443 as an optical element and forms an air flow path for cooling them.
The heat radiating member 9 is not limited to aluminum, and can be formed using the same material as the holding frame 447 of the above-described light modulation device 441R (441G, 441B).

As shown in FIGS. 8 and 10, the heat dissipating member 9 has a substantially convex shape as viewed from the illumination optical axis direction (Z-axis direction) in accordance with the outer shape of the holding frame 447 of the light modulation device 441R. It is formed in a substantially U shape when viewed from the vertical direction (Y-axis direction).
The heat radiating member 9 is brought into contact with the light incident surface and the lower surface of the first holding frame 447A constituting the holding frame 447 described above, and two approximate positions for positioning the heat radiating member 9 with respect to the first holding frame 447A. An L-shaped positioning portion 91, an extending portion 92 extending in the illumination optical axis direction (Z-axis direction) from the width direction (X-axis direction) end portion of the positioning portion 91, and the extending portions 92 are connected. And a connecting portion 93 that is in contact with the upper surface of the light modulation device 441R (441G, 441B).

  The positioning portions 91 are formed in a substantially L-shaped cross section in the height direction, and are attached to both end portions of the first holding frame 447A, respectively. The surface on the light beam exit side and the surface facing the height direction (Y-axis direction) of the positioning portion 91 position the heat radiation member 9 in the illumination optical axis direction (Z-axis direction) and the height direction with respect to the first holding frame 447A. This is a positioning surface 91A. Further, since the positioning surface 91A comes into contact with the first holding frame 447A, the heat generated by the light modulation device 441R (441G, 441B) is conducted to the heat radiating member 9 via the positioning surface 91A. Is done.

The extending portion 92 is a portion that forms a flow path of cooling air blown from the lower side of the light modulation device 441R (441G, 441B) by the cooling unit 7, and from the positioning portion 91, the optical conversion plate 443 and the holding unit are held. The member 448 extends so as to cover a side surface standing from the end in the width direction. The extending portion 92 is formed in a substantially S-shaped cross section, a substantially middle portion of the extending portion 92 is bent outward, and extends substantially parallel to the illumination optical axis direction from the tip portion. That is, the widthwise dimension of the heat dissipating member 9 at the extending direction distal end of the extending part 92 extending from each positioning part 91 is larger than the widthwise dimension of the heat dissipating member 9 at the extending direction base end. Has been.
In addition, the height direction dimension of the extension part 92 is formed larger than the height direction dimension of the positioning part 91, and the height direction extends from the bent part of the extension part 92 to the front end part in the extension direction. It extends in the (Y-axis direction).
Such an extension portion 92 can reliably cover the side surfaces of the optical conversion plate 443 and the holding member 448, and can form a cooling air flow path.

The connection part 93 is a part which connects the extension part 92 extended from each positioning part 91 as mentioned above, and, thereby, the heat radiating member 9 is integrated.
The connecting portion 93 is formed in substantially the same shape as the upper surface of the first holding frame 447A of the light modulation device 441R (441G, 441B), and the lower surface of the connecting portion 93 is in contact with the upper surface of the first holding frame 447A. . Accordingly, the heat radiating member 9 is positioned in the height direction with respect to the first holding frame 447 </ b> A by the weight of the heat radiating member 9.

An opening 931 and a notch 932 are formed in the connecting portion 93.
The opening 931 is formed in the approximate center of the connecting portion 93 along the width direction. The control cable 441R2 (441G2, 441B2) provided in the liquid crystal panel 441R1 (441G1, 441B1) is inserted into the opening 931.
The cutout 932 is formed from the light incident side of the connecting portion 93 toward the opening 931. The notch 932 is formed at a position corresponding to the fin 447A2 of the first holding frame 447A described above, and cools the fin 447A2 so as not to hinder the flow of air rising with heat.

FIG. 11 shows a perspective view of the prism base 445. Among these, FIG. 11A shows a perspective view of the prism pedestal 445 viewed from the upper side on the light beam exit side, and FIG. 11B shows the prism pedestal 445 viewed from the lower side on the light beam incident side. A perspective view is shown.
The prism base 445 is a member that supports the projection lens 3 as well as the cross dichroic prism 444 as described above. As shown in FIGS. 8 and 11A and 11B, the prism base 445 is formed in an approximately L shape when viewed from the width direction (X-axis direction).

The prism base 445 is provided with a placement portion 4451 on which the cross dichroic prism 444 is placed and a lens support portion 4452 that supports the projection lens 3.
The placement portion 4451 has a substantially rectangular shape in plan view and is made of magnesium. On the upper surface of the mounting portion 4451, a first mounting surface 44511 on which the cross dichroic prism 444 is mounted and a second mounting surface 44512 on which the first optical conversion plate 443A of the optical conversion plate 443 is mounted. And an attachment surface 44513 to which the holding member 448 is attached.

  The first placement surface 44511 is formed in a substantially rectangular shape substantially at the center of the placement portion 4451. A circular portion (not shown) having a substantially circular shape in plan view and a height dimension that increases toward the center is formed in a substantially central portion of the first placement surface 44511. A cross dichroic prism 444 is placed on the circular portion. Accordingly, when the cross dichroic prism 444 is placed on the first placement surface 44511, the inclination of the cross dichroic prism 444 with respect to the incident light beam can be easily adjusted.

The second placement surface 44512 is formed on the outer edge portion of the placement portion 4451. As described above, the first optical conversion plate 443A is placed on the second placement surface 44512 so as to be able to conduct heat on three sides except the light beam emission side (Z-axis direction front end side).
The attachment surface 44513 is a surface that is formed substantially hanging from the outer edge end portion of the placement portion 4451. The attaching portion 448A4 of the holding member 448 is bonded and fixed to the mounting surface 44513 so as to be able to conduct heat.

The lens support portion 4452 is a portion that stands substantially vertically from the light emission side (Z-axis direction front end side) of the mounting portion 4451 and is formed in a substantially rectangular shape.
The lens support portion 4452 includes a substantially circular opening 44521 formed in the substantially center, a protrusion 44522 and a hole 44523 formed in the surface 4452A of the lens support portion 4452 on the light beam exit side, and the width of the lens support portion 4452. And a protruding portion 44524 protruding in the out-of-plane direction from the surface facing the direction (X-axis direction).

The opening 44521 is a portion through which the optical image synthesized by the cross dichroic prism 444 is transmitted, and is a portion to which the outer peripheral portion of the projection lens 3 is connected. The inner diameter dimension of the opening 44521 is formed so as to substantially match the outer diameter dimension of the projection lens 3.
The protrusion 44522 and the hole 44523 are portions that engage with a flange 3 </ b> C (see FIG. 7) formed in the projection lens 3 to position and fix the projection lens 3. Among these, the protrusion 44522 is formed to protrude from the surface 4452A in the out-of-plane direction, and is fitted into a hole (not shown) formed in the flange 3C of the projection lens 3. Further, the hole 44523 is formed so as to penetrate the lens support portion 4452, and a projection (not shown) formed in the flange portion 3C is fitted therein.
The protruding portion 44524 is formed above each side surface of the lens support portion 4452 facing the width direction. The protrusion 44524 has a substantially triangular shape when viewed from the light beam exit side, and a protrusion 4453 is formed on the lower surface. These protrusions 4453 are fitted into recesses (not shown) formed in the lower case 22 to fix the prism base 445. Note that such a protrusion 4453 is also formed on the bottom surface of the mounting portion 4451 described above.

  In addition, as a material of such a prism base 445, you may form not only magnesium but metals, such as aluminum with high heat conductivity, and may form with a heat conductive synthetic resin.

FIG. 12 shows a perspective view of the heat dissipation block 446. Among these, FIG. 12A shows a perspective view of the heat dissipating block 446 as viewed from above the light incident side, and FIG. 12B shows a perspective view as viewed from below of the light incident side. It is shown.
The heat radiation block 446 is a member that radiates and cools the heat of the first optical conversion plate 443A and the heat conducted through the holding member 448. As described above, the heat dissipation block 446 is placed on the upper surface of the cross dichroic prism 444.

The heat dissipating block 446 is a magnesium member formed in a trapezoidal shape that has a substantially rectangular shape in plan view and is inclined so that the outer dimension decreases toward the upper side (Y-axis direction). The size of the bottom surface of the heat dissipation block 446 is formed larger than the size of the top surface of the cross dichroic prism 444.
The heat dissipation block 446 can employ the material exemplified for the holding frame 447 in addition to magnesium.

As shown in FIGS. 12A and 12B, the heat dissipating block 446 has a plurality of protrusions 4461, a first contact surface 4462, a second contact surface 4463, and a mounting surface 4464. Yes.
The protrusions 4461 are heat dissipation protrusions for expanding the heat dissipation area of the heat conducted to the heat dissipation block 446, and are formed in the present embodiment by 16 pieces. These protrusions 4461 are formed to protrude in the out-of-plane direction from the upper surface of the heat dissipation block 446.
The mounting surface 4464 is a surface on the light beam incident side that substantially hangs down from the upper surface of the heat dissipation block 446, and the pasting portion 448A2 of the holding member 448 is bonded and fixed so as to be thermally conductive.

The first contact surface 4462 and the second contact surface 4463 are formed on the bottom surface of the heat dissipation block 446. As shown in FIG. 12B, the bottom surface has a shape recessed inward, and a first contact surface 4462 is formed in the concave portion, and the third surface on the light beam incident side of the outer edge portion of the bottom surface is the first surface. Two abutting surfaces 4463 are formed.
The first contact surface 4462 is a surface with which the upper surface of the cross dichroic prism 444 is contacted, and the second contact surface 4463 is a surface with which the upper surface of the first optical conversion plate 443A is contacted.

  The prism base 445 and the heat radiating block 446 generate heat in the cross dichroic prism 444 and the first optical conversion plate 443A to dissipate the heat, and in addition to the second through the holding member 448 and the pin spacer 449. Since the heat of the optical conversion plate 443B and the light modulation device 441R (441G, 441B) is conducted and dissipated, the heat of these optical components can be efficiently cooled.

The assembly of the optical device 44 will be described below.
Of the optical conversion plate 443, the first optical conversion plate 443A is attached to the three light flux incident surfaces of the cross dichroic prism 444 with an ultraviolet curable adhesive or the like.
Thereafter, the bottom surface of the cross dichroic prism 444 and the lower surface of the first optical conversion plate 443A are brought into contact with the first mounting surface 44511 and the second mounting surface 44512 of the prism base 445 (FIGS. 8 and 11). In addition, the cross dichroic prism 444 and the first optical conversion plate 443A are placed on the placement portion 4451 of the prism base 445.
Further, heat is radiated so that the first contact surface 4462 and the second contact surface 4463 of the heat dissipation block 446 (FIGS. 8 and 12) are in contact with the upper surface of the cross dichroic prism 444 and the upper surface of the first optical conversion plate 443A. Block 446 is placed.

Next, the second optical conversion plate 443B is attached to the holding member 448 attached to the prism base 445 and the heat dissipation block 446. The second optical conversion plate 443B is attached to the board attachment surface 448C1 of the extending portion 448C formed on the holding member 448.
Thereafter, the holding member 448 (FIG. 9) that holds the second optical conversion plate 443B is attached to the prism base 445 and the heat dissipation block 446. The holding member 448 is arranged such that the affixing portion 448A2 of the holding member 448 is in contact with the mounting surface 4464 of the heat dissipation block 446 and the affixing portion 448A4 is in contact with the mounting surface 44513 of the prism base 445. The holding member 448 is fixed with a heat conductive adhesive or the like. The holding member 448 is arranged so that the substrate 443A1 of the first optical conversion plate 443A is exposed from the opening 448A1 formed in the holding member 448, and the first optical conversion plate 443A and the second optical conversion plate 443B. Are arranged so as to have the aforementioned relationship.

  Next, the heat dissipation member 9 is attached to the light modulation device 441R (441G, 441B). At this time, the control cable 441R2 (441G2, 441B2) provided in the light modulation device 441R (441G, 441B) is inserted through the opening 931 formed in the connecting portion 93 of the heat dissipation member 9. Thereafter, the lower surface of the connecting portion 93 is brought into contact with the upper surface of the first holding frame 447A, and the positioning surface 91A is brought into contact with the surface facing the illumination optical axis direction (Z-plane direction) of the first holding frame 447A. Thereby, the heat radiating member 9 is attached to the light modulation device 441R (441G, 441B), and the extending portion 92 extends to the light emission side.

Next, the light modulation device 441R (441G, 441B) to which the heat radiating member 9 is attached is attached to the holding member 448 via the pin spacer 449. The pin spacer 449 is bonded and fixed to the surface 448C2 of the holding member 448 on the light beam incident side so as to protrude in the out-of-plane direction. This pin spacer 449 is inserted into a hole 447B3 formed in the second holding frame 447B of the light modulation device 441R (441G, 441B), and the light modulation device 441R (441G, 441B) is attached. Attach a cap (not shown) to the tip. At this time, the adjustment of the distance between the light modulation device 441R (441G, 441B) and the second optical conversion plate 443B located in the latter stage on the optical path, and the light of the light beam emitted from the light modulation device 441R (441G, 441B) Adjustment of coincidence between the axis and the optical axis of the light beam incident on the second optical conversion plate 443B is appropriately performed.
As described above, the optical device 44 is formed as a unit.
The pin spacer 449 is formed as a separate member with respect to the holding member 448, but may be formed integrally with the holding member 448. Further, the attachment of the heat radiation member 9 to the light modulation device 441R (441G, 441B) may be performed after the light modulation device is attached to the holding member 448 via the pin spacer 449.

  According to such an optical device 44, the heat generated in the liquid crystal panel 441R1 (441G1, 441B1) of the light modulation device 441R (441G, 441B) is conducted to the heat radiating member 9 through the holding frame 447 and radiated. . The heat of the light modulation device 441R (441G, 441B) is conducted to the holding member 448 via the pin spacer 449. The holding member 448 is connected to the prism base 445 and the heat dissipation block 446, and together with the heat generated by the second optical conversion plate 443B attached to the holding member 448, the heat of the light modulation device 441R (441G, 441B). Is conducted to the prism base 445 and the heat dissipation block 446. Further, the heat generated by the cross dichroic prism 444 and the first optical conversion plate 443A is directly conducted to the prism base 445 and the heat dissipation block 446. Therefore, the heat radiation area of these optical components 441, 443, 444 can be expanded, and the optical components 441, 443, 444 can be efficiently cooled.

(4) Cooling flow path of optical device 44 FIG. 13 shows a perspective view of a duct 73 that blows cooling air to the optical device 44 as viewed from below. FIG. 14 shows a perspective view of the duct 73 and the air guide plate 74 as viewed from above.
As described above, the ducts 73 and 74 constituting the cooling unit 7 form a flow path for blowing the air outside the projector 1 blown from the sirocco fans 71 and 72 to the optical device 44. The duct 73 and the air guide plate 74 are disposed below the optical device 44.

As shown in FIGS. 13 and 14, the duct 73 is a synthetic resin member formed in a substantially U shape in plan view. The duct 73 is formed with openings 731 and 732 at the U-shaped tip and a plurality of ribs 73A, 73B, and 73C inside.
The openings 731 and 732 are connected to the air blowing ports of the sirocco fans 71 and 72 described above.
The ribs 73 </ b> A, 73 </ b> B, 73 </ b> C are portions that reinforce the duct 73 and divert cooling air blown from the openings 731, 732.
Among them, as shown in FIG. 14, the rib 73A causes the cooling air flowing from the opening 731 to flow below the light modulation device 441G of the optical device 44 and not to flow below the light modulation devices 441B and 441R. It is made to shunt.
On the other hand, the rib 73B guides the cooling air flowing from the opening 732 into the above-described component storage member 401 from below the light modulation devices 441B and 441R and from the vicinity of the light modulation device 441G, and thereby the light modulation device 441G. It is divided so that it does not circulate below.
The rib 73C divides the air circulated below the light modulation device 441G by the rib 73A so as to circulate below the light modulation device 441G and below the optical conversion plate 443 disposed at the rear stage of the light modulation device 441G. .

The air guide plate 74 is formed as an integrally molded product made of synthetic resin. The air guide plate 74 is disposed above the duct 73, and the prism base 445 of the optical device 44 is placed above the air guide plate 74. In addition, you may shape | mold with metals, such as aluminum, magnesium, and titanium, without using a synthetic resin.
The air guide plate 74 is formed with air guide portions 74B, 74G, 74R, and 74A having openings 74R1, 74G1, 74B1, and 74A1, respectively. Among these, the air guide portions 74R, 74G, and 74B are formed at positions corresponding to the light modulation devices 441R, 441G, and 441B, respectively. The air guide portion 74A is formed at a position closer to the air guide portion 74B from the air guide portion 74G.

The air guide portions 74R, 74G, and 74B are portions that guide the cooling air flowing through the duct 73 to the light modulation devices 441R, 441G, and 441B and the optical conversion plate 443 of the optical device 44.
Of these, in addition to the opening 74B1, the air guide part 74B includes an upper air guide part 74B2 that protrudes upward so as to surround the periphery of the opening 74B1, and lower air guide parts 74B3 and 74B4 that extend downward. It has.

The lower air guide portions 74B3 and 74B4 are formed so as to extend from the opening 732 in a substantially U-shape that opens in a direction opposite to the flow direction of the cooling air flowing through the duct 73.
The lower air guide 74B3 divides the opening 74B1 into two openings 74B11 and 74B12, and guides cooling air to the light modulation device 441B through the opening 74B11. The openings 74B11 and 74B12 divided by the lower air guide portion 74B3 are positioned below the light beam incident side and the light beam emission side of the light modulation device 441B, respectively.
The lower air guide portion 74B4 is formed to extend downward from the end of the opening portion 74B1 in a U-shaped cross section, and guides cooling air to the optical conversion plate 443 through the opening 74B12. The downward extending amount of the lower air guiding portion 74B4 is assumed to be larger than the extending amount of the lower air guiding portion 74B3. Thereby, the cooling air can be reliably guided to the optical conversion plate 443 also in the lower air guide portion 74B4 formed farther than the lower air guide portion 74B3 with respect to the opening 732 of the duct 73.

Similarly to the air guide portion 74B, the air guide portion 74R includes an upper air guide portion 74R2 that stands up so as to surround the opening 74R1, and a lower air guide portion 74R4 that guides the optical conversion plate 443. Further, the opening 74R1 is divided into an opening 74R12 that guides cooling air below the light modulation device 441R and an opening 74R11 that guides cooling air below the optical conversion plate 443 by the lower air guide 74R4. .
Further, unlike the air guide portion 74B, the air guide portion 74R is not formed with a lower air guide portion that guides cooling air to the light modulation device 441R. This is because when the cooling air flowing through the duct 73 from the opening 732 passes through the lower air guide portion 74R4, the flow path in the duct 73 is blocked by the rib 73A. For this reason, the cooling air flows into the opening 74R1 of the air guide portion 74R and is naturally guided to the light modulation device 441R. A lower air guide portion similar to the lower air guide portion 74B3 of the air guide portion 74B may be provided depending on the shape of the duct 73, the circulation amount of the cooling air, and the like.

The air guide portion 74G includes an opening portion 74G1 and an upper air guide portion 74G2 that is substantially E-shaped in a plan view and stands up from the periphery of the opening portion 74G1. Of these, the opening 74G1 is divided into an opening 74G11 that guides the cooling air below the light modulation device 441G and an opening 74G12 that guides the cooling air below the optical conversion plate 443 by the upper air guide 74G2. It is done.
A lower air guide portion is not formed in the air guide portion 74G. This is because the rib 73C formed in the duct 73 is divided into cooling air guided to the light modulation device 441G and cooling air guided to the optical conversion plate. Further, the cooling flow path in the duct 73 is blocked by the rib 73A, and the cooling air flowing from the opening 731 is discharged from the opening 74G1 at the front end of the flow path in the duct 73 by the blowing pressure. It is done. For this reason, the cooling air is guided to the light modulation device 441G and the optical conversion plate 443 through the opening 74G1 of the air guide portion 74G even if the lower air guide portion is not formed.

The air guide portion 74 </ b> A is a portion that circulates in the duct 73 from the opening 732 and guides the cooling air divided by the rib 73 </ b> B into the component housing member 401. The air guide portion 74A is configured by a substantially rectangular opening 74A1 and an upper air guide portion 74A2 that is substantially U-shaped in a plan view and stands up from the periphery of the opening 74A1. Here, the reason why the lower air guide portion is not formed is that, as in the case of the air guide portion 74G, the flow path of the cooling air is defined by the rib 73B.
Also in these air guide portions 74G and 74A, a lower air guide portion may be provided according to the flow path and circulation amount of the cooling air.

Hereinafter, a flow path of cooling air for cooling the optical device 44 will be described.
As shown in FIG. 13 and FIG. 14, the cooling air blown from the sirocco fans 71, 72 is arranged in the respective light modulation devices 441 R, 441 G, 441 B and their subsequent stages via the duct 73 and the air guide plate 74. The air is blown below the optical conversion plate 443. Here, as described above, the cooling air blown from the sirocco fan 71 and circulated in the duct 73 from the opening 731 passes through the openings 74G11 and 74G12 of the air guide portion 74G formed in the air guide plate 74. The light is guided to the light modulation device 441G and the optical conversion plate 443. The cooling air blown from the sirocco fan 72 and circulated in the duct 73 from the opening 732 is diverted by the rib 73B, and one of the cooling air passes through the openings 74B11, 74B12, 74R11, and 74R12 of the air guide portions 74B and 74R. The light modulation devices 441B and 441R and the optical conversion plate 443 disposed at the rear stage of the light modulation devices 441B and 441R are guided, and the other is inside the component housing member 401 via the opening 74A1 of the wind guide portion 74A. Be guided to.

FIG. 15 is a schematic diagram showing a flow path of cooling air for cooling the optical device 44. In FIG. 15, among the cooling channels for cooling the incident surface on which each color light of the optical device 44 is incident, the cooling channel of the red light incident surface is shown, but the green light incident surface and the blue light incident surface are shown. Since the cooling flow path is substantially the same, description and illustration are omitted.
The cooling air blown from the sirocco fan 72 (see FIGS. 3 and 4) flows through the duct 73 through the opening 732 (see FIG. 14). Of this cooling air, the cooling air flowing under the optical device 44 is divided into three directions. More specifically, as shown in FIG. 15, the cooling air is guided to the opening 74B11 by the lower air guide portion 74B3 formed in the air guide portion 74B of the air guide plate 74, and the air guide portion 74B. Are divided into an arrow B1 direction that is guided to the opening 74B12 by the lower air guide portion 74B4 and an arrow W1 direction that circulates in the duct 73 and cools the light modulator 441R and the like.

  The cooling air guided in the direction of the arrow A1 passes through the opening 74B11, flows in the direction of the arrow A2 toward the light beam incident side of the light modulation device 441B, rises along the light modulation device 441B, and the light modulation device The surface of the first holding frame 447A where the heat of the liquid crystal panel 441B1 housed in the 441B is conducted is cooled. The cooling air that has cooled the first holding frame 447A is heated to rise further, and flows in the direction of arrow A3.

The cooling air guided in the direction of the arrow B1 passes through the opening 74B12, and then is divided into the direction of the arrow B21 and the direction of the arrow B22.
Among these, the cooling air flowing in the direction of the arrow B21 flows between the light emitting side surface of the light modulation device 441B, the surface rising from the end in the width direction, and the light incident surface of the second optical conversion plate 443B. To do. That is, the cooling air includes the light-emitting side surface of the light modulation device 441B, the light-incident surface of the second optical conversion plate 443B, and the extending portion 92 of the heat radiating member 9 (see FIGS. 6 to 8 and 10). It circulates in the cooling channel surrounded by. At this time, the cooling air includes the side surface in the width direction of the first holding frame 447A and the surface on the light emission side of the second holding frame 447B through which the heat of the liquid crystal panel of the light modulation device 441 is conducted, and the second optical conversion plate. While cooling the light beam incident side surfaces of 443B and the holding member 448 and the heat dissipating member 9, they rise along these and circulate in the direction of arrow B3.

  The cooling air flowing in the direction of the arrow B22 is a cooling flow that is surrounded by the light incident surface of the first optical conversion plate 443A, the light emission surface of the second optical conversion plate 443B, and the extending portion 92 of the heat radiating member 9. It circulates in the road upward. At this time, the cooling air not only cools the holding member 448, the first optical conversion plate 443A, the second optical conversion plate 443B, and the heat dissipation member 9, but also cools the prism base 445 to which the holding member 448 is attached. The cooling air that has cooled these optical components 443, 445, and 448 rises while cooling the heat dissipation block 446, and circulates in the direction of arrow B3.

  The cooling air flowing in the arrow B3 direction flows along the control board 5 together with the cooling air flowing in the arrow A3 direction, and cools the control board 5. Here, the air that has cooled the light modulation device 441R and the optical conversion plate 443 disposed on the red light incident surface of the cross dichroic prism 444 circulates between the protrusions 4461 of the heat dissipation block 446 and cools the heat dissipation block 446. , Distributed along the control board 5. At this time, since the intensity of the red light is set lower than the intensity of the other color light, the temperature of the cooling air flowing through the red light incident surface side is higher than that of the cooling air flowing through the other color light incident surface side. It can be suppressed. Therefore, the heat radiation block 446 can be cooled with cooling air having a lower temperature than other cooling air.

  Here, in the flow path of the cooling air flowing in the directions of arrows B21 and B22, the second optical conversion plate 443B and the side surface portion 448B of the holding member 448 are covered by the extending portion 92 of the heat radiating member 9. For this reason, the flow path of the cooling air which distribute | circulates the arrow B21 and B22 direction is prescribed | regulated by the extension part 92, and it can prevent that cooling air diffuses around. Therefore, the loss of cooling air can be reduced by the heat radiating member 9, and the circulation of the cooling air in the cooling flow path can be made smooth to efficiently cool the optical conversion plate 443 and the light modulation device 441B. . Further, this can suppress damage, modification and thermal deterioration of the optical conversion plate 443 and the light modulation device 441B, so that the product life can be extended and the optical image formation can be stabilized.

  Further, a holding member 448 that conducts heat of the light modulation device 441B and the second optical conversion plate 443B, and a prism base that conducts heat generated by the holding member 448, the first optical conversion plate 443A, and the cross dichroic prism 444. Since the cooling air flow path is formed so that the cooling air is cooled between the 445 and the heat radiation block 446, these can be efficiently cooled to further stabilize the optical image formation.

  Further, cooling air for cooling the light modulation device 441B and the optical conversion plate 443 is blown from below the light modulation device 441B and the optical conversion plate 443. According to this, the cooling air rises with heat and can generate an updraft. According to this, the cooling air in the cooling channel can be more smoothly circulated without stagnation, and the amount of air flowing in the cooling channel can be increased. Therefore, the light modulation device 441, the optical conversion plate 443, the prism base 445, the heat radiation block 446, and the holding member 448 can be cooled more efficiently.

[2. Second Embodiment]
Next, an optical device according to a second embodiment of the present invention will be described. The optical device according to the second embodiment is different from the above-described optical device according to the first embodiment in the structure and arrangement of the heat dissipation member. In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.

FIG. 16 is a perspective view of an optical device 44A according to the second embodiment of the present invention. More specifically, FIG. 16 shows a perspective view of the optical device 44A viewed from below with the light modulation device 441R in front. The light modulation device 441 and the prism pedestal 445 shown in FIG. 16 are substantially the same in configuration and function, although the shapes thereof are slightly different from those of the light modulation device 441 and the prism pedestal 445 shown in FIGS.
As shown in FIG. 16, the heat radiating member 9A of the optical device 44A is attached to the surface of the light modulator 441 (441R, 441G, 441B) on the light beam exit side.

FIG. 17 is a perspective view of the heat radiating member 9A as viewed from above the light beam exit side.
The heat dissipating member 9A is a member having a substantially U-shaped cross section. The heat dissipating member 9A is attached to the light modulation device 441 (441R, 441G, 441B), dissipates heat from the light modulation device 441, and is disposed in front of the light modulation device 441 and the light modulation device 441. This is a member for forming a cooling air flow path for cooling the polarizing plate 442 as an element.
As shown in FIG. 17, the heat dissipating member 9A includes a substantially rectangular positioning portion 9A1 and an extending portion 9A2 extending in the out-of-plane direction from both ends in the width direction (X-axis direction in FIG. 17) of the positioning portion 9A1. And.
The heat radiating member 9A can be formed of the same material as the heat radiating member 9 described above.

The positioning portion 9A1 is in contact with the surface on the light beam exit side of the light modulation device 441 so as to be able to conduct heat, and a positioning surface 9A11 for positioning the heat dissipation member 9A, and an opening through which the light beam emitted from the light modulation device 441 passes. A portion 9A12 and two openings 9A13 through which the pin spacer 449 is inserted are formed.
Among these, the opening 9A12 is formed at the approximate center in the width direction of the positioning portion 9A1 and below. That is, the opening 9A12 is formed at substantially the same position as the light exit surface of the light modulator 441. One opening 9A13 is formed at each end in the width direction of the positioning portion 9A1 and above the opening 9A12. A portion of the light modulation device 441 through which the pin spacer 449 is inserted is fitted into the opening 9A13.

  Such positioning portion 9A1 positions the heat radiation member 9A with respect to the light modulation device 441. In other words, the positioning surface 9A11 is brought into contact with the surface on the light beam exit side of the light modulation device 441, whereby the radiation member 9A is positioned in the illumination optical axis direction (Z-axis direction) with respect to the light modulation device 441. Further, by fitting a part of the light modulation device 441 into the two openings 9A13, positioning in the width direction (X-axis direction) and the height direction (Y-axis direction) is performed. After such positioning with respect to the light modulation device 441, the heat radiating member 9A is bonded and fixed to the light modulation device 441 so as to allow heat conduction.

The extension portion 9A2 is a portion that forms a flow path of cooling air blown below the light modulation device 441, similarly to the extension portion 92 formed in the heat dissipation member 9 described above. That is, the extending portion 9A2 covers the side surfaces in the width direction of the light modulation device 441 and the polarizing plate 442, flows from below the light modulation device 441, and flows cooling air for cooling the light modulation device 441 and the polarizing plate 442. Form a road. The extending portions 9A2 are formed so as to extend from both ends of the positioning surface 9A11 of the positioning portion 9A1 in the out-of-plane direction, that is, toward the light beam incident side of the light modulation device 441 and to face each other.
At the lower ends of these extending portions 9A2, guide portions 9A21 are formed as first guide portions formed in the direction in which the extending portions 9A2 approach each other and extending downward. The guide portion 9A21 is disposed so as to surround the upper air guide portions 74R2, 74G2, and 74B2 of the air guide portions 74R, 74G, and 74B formed on the air guide plate 74 described above.

Therefore, by attaching the heat radiating member 9A having such a configuration to the light modulation device 441, substantially the same effect as the heat radiation member 9 exerted on the light modulation device 441 and the optical conversion plate 443 can be obtained. This can be performed with respect to the polarizing plate 442.
That is, the guide portion 9A21 formed on the heat dissipating member 9A for the cooling air guided from the air guide portions 74R, 74G, and 74B of the air guide plate 74 disposed below the light modulator 441 is provided in the light modulator 441. By guiding to the light beam incident side, the loss of cooling air due to diffusion below the light modulation device 441 can be reduced, and the cooling air can be reliably distributed to the light beam incidence side of the light modulation device 441. . Further, since this cooling air can be used for cooling the light modulation device 441 and the polarizing plate 442 disposed in the front stage of the light modulation device 441, the cooling efficiency of the light modulation device 441 and the polarizing plate 442 can be improved. Can be improved.

  Similarly to the heat radiating member 9 described above, the extending portion 9A2 of the heat radiating member 9A is formed and arranged so as to cover the side surfaces in the width direction of the light modulation device 441 and the polarizing plate 442, so that the light modulation device 441, A substantially cylindrical cooling channel is formed by the polarizing plate 442 and the extending portion 9A2 of the heat dissipation member 9A. According to this, it is possible to prevent the cooling air that cools the light modulation device 441, the polarizing plate 442, and the heat radiating member 9A from diffusing, and the amount of cooling air loss can be further reduced, and the light modulation device 441 can be reduced. The flow of the cooling air that circulates between the light beam incident surface and the polarizing plate 442 can be made smooth. The air permeability in the cooling flow path is further improved by generating an upward air flow when the cooling air subjected to the cooling is heated. Therefore, the circulation amount of the cooling air can be increased, and the light modulation device 441 and the polarizing plate 442 by the cooling air can be cooled more efficiently.

[3. Third Embodiment]
Next, an optical device according to a third embodiment of the invention will be described. The optical device of the second embodiment has substantially the same configuration as the optical device of the second embodiment described above, but has a difference in the formation position of the guide portion formed on the heat radiating member.

FIG. 18 is a perspective view of the heat radiating member 9B attached to the light modulation device 441 of the optical device 44A according to the third embodiment of the present invention, as viewed from above the light beam emission side.
The heat radiating member 9B dissipates heat from the light modulation device 441 to which the heat radiating member 9B is attached, and the width direction of the light modulation device 441 and the polarizing plate 442 (X-axis in FIG. 18). This is a member that forms a cooling air flow path that cools the light modulation device 441 and the polarizing plate 442 by covering both side surfaces in the direction).
In addition, the heat radiating member 9B can be formed by adopting the material shown for the heat radiating member 9 described above.

The heat dissipating member 9B is formed with a positioning portion 9B1, an extending portion 9B2, and a guide portion 9B3.
Among these, the positioning portion 9B1 is a portion corresponding to the positioning portion 9A1 of the heat radiating member 9A, and conducts heat to the light emitting side surface of the light modulation device 441 at substantially the same position as the positioning surface 9A11 and the openings 9A12 and 9A13. Positioning surfaces 9B11 and openings 9B12 and 9B13 for positioning the heat radiating member 9B are formed so as to be able to come into contact with each other. Thus, the heat dissipating member 9B is positioned with respect to the light modulation device 441.
Further, the extending portion 9B2 is also formed to extend in the out-of-plane direction (direction opposite to the Z-axis direction) from both ends in the width direction (X-axis direction) of the positioning surface 9B11 of the positioning portion 9B1. Note that the extension portion 9B2 is different from the extension portion 9A2 of the heat dissipation member 9A in that the dimension in the height direction (Y-axis direction) is substantially the same as the dimension in the height direction of the positioning portion 9B1.

  The guide portion 9B3 guides the cooling air guided from the openings 74R11, 74G11, 74B11 formed in the air guide plate 74 to the light beam incident side of the light modulation device 441, similarly to the guide portion 9A21 of the heat radiating member 9A. It is a part for. The guide portion 9B3 has a width direction dimension that is substantially the same as the width direction dimension of the opening 9B12, and is located at the end of the positioning portion 9B1 below the positioning surface 9B11 (the direction opposite to the Y-axis direction). It is formed substantially from the center.

According to the heat radiating member 9B having such a configuration, substantially the same effect as the heat radiating member 9A of the second embodiment described above can be obtained.
That is, the cooling air guided to the lower side of the light modulation device 441 (441R, 441G, 441B) from the openings 74R11, 74G11, 74B11 of the air guide plate 74 is guided by the guide portion 9B3 of the heat radiating member 9B. Guided to the light beam incident side. Thereby, the loss of cooling air due to diffusion under the light modulation device 441 can be reduced, and the cooling air can be reliably circulated between the light modulation device 441 and the polarizing plate 442. Therefore, the cooling efficiency of the light modulation device 441 and the polarizing plate 442 can be improved.

Also, a cooling air flow path for cooling the light modulation device 441 and the polarizing plate 442 is formed by an extension portion 9B2 formed on the heat radiation member 9B and covering the side surfaces in the width direction of the light modulation device 441 and the polarizing plate 442. be able to. That is, a substantially cylindrical cooling channel can be formed by the light modulation device 441, the polarizing plate 442, and the heat dissipation member 9B. By causing the cooling air to flow through the cooling flow path, it is possible to suppress the loss of the cooling air and improve the air permeability of the cooling air, so that the light modulation device 441, the polarizing plate 442, and the heat radiating member 9B can be improved. Cooling efficiency can be improved.
Further, since the cooling air is supplied from below the light modulation device, the cooling air used for cooling the light modulation device 441, the polarizing plate 442, and the heat radiating member 9B rises with heat and generates an updraft. Therefore, the circulation of the cooling air is further promoted.
Accordingly, since the amount of cooling air that cools the light modulation device 441 and the polarizing plate 442 can be increased, the cooling efficiency can be further improved.

[4. Fourth Embodiment]
Next, an optical device according to a fourth embodiment of the present invention will be described. The optical device of the fourth embodiment has substantially the same configuration as the optical devices of the second and third embodiments described above, but is different in the formation position of the air guide portion formed on the heat dissipation member attached to the light modulation device. Have

FIG. 19 shows a perspective view of the heat radiating member 9C of the optical device 44A according to the fourth embodiment of the present invention as viewed from above the light beam exit side.
Similarly to the heat radiating members 9A and 9B, the heat radiating member 9C is attached to the surface on the light emission side of the light modulation device 441, and dissipates heat conducted from the light modulation device 441, and the light modulation device 441 and the polarizing plate. This is a member that covers the side surface of the width direction 442 and forms a flow path of cooling air for cooling them.
The heat radiating member 9 </ b> C can be formed using the material shown for the heat radiating member 9 described above.

The heat radiating member 9C has a shape that combines the heat radiating members 9A and 9B. That is, as shown in FIG. 19, the heat dissipating member 9C is formed with a positioning portion 9C1, an extending portion 9C2, and a second guide portion 9C3.
Of these, the positioning portion 9C1 corresponds to the positioning portion 9A1 of the heat dissipating member 9A, and the positioning portion 9C1 is optically modulated at substantially the same position as the positioning surface 9A11 and the openings 9A12 and 9A13 formed in the positioning portion 9A1. A positioning surface 9C11 and openings 9C12 and 9C13 are formed in contact with the surface of the device 441 on the light beam exit side so as to allow heat conduction. The positioning surface 9C11 conducts heat of the light modulation device 441 to the heat dissipation member 9C, and the positioning surface 9C11 and the opening 9C13 position the heat dissipation member 9C with respect to the light modulation device 441.
The extending portions 9C2 are formed so as to stand in the out-of-plane direction from both ends in the width direction of the positioning surface 9C11 and to face each other. Similarly to the guide portion 9A21 formed on the extension portion 9A2 of the heat radiating member 9A, the extension portion 9C2 extends downward from the lower end of the extension portion 9C2 in a direction close to each other. A first guide portion 9C21 is formed.
Similarly to the guide portion 9B3 formed on the heat radiating member 9B, the second guide portion 9C3 has substantially the same width direction size as the opening portion 9C12 and is opposite to the positioning surface 9C11 of the positioning portion 9C1. It is formed so as to hang from substantially the lower end of the surface.

According to the heat radiating member 9C having such a configuration, substantially the same effects as those of the heat radiating members 9A and 9B described above can be obtained.
That is, since the first guide portion 9C21 and the second guide portion 9C3 of the heat radiating member 9C are arranged so as to surround the openings 74R11, 74G11, 74B11 of the air guide plate 74, compared with the case where the heat radiating members 9A, 9B are used. Of the cooling air supplied from the openings 74R11, 74G11, and 74B11, more cooling air can be guided to the light incident side of the light modulator 441. Accordingly, more cooling air can be used for cooling the light modulation device 441, the polarizing plate 442, and the heat radiating member 9, and the cooling air is reliably circulated between the light modulation device 441 and the polarizing plate 442. be able to. Accordingly, the amount of cooling air flowing through the cooling flow path can be increased, and the cooling efficiency of the light modulation device 441 and the polarizing plate 442 can be improved.

Further, the light modulation device 441, the polarizing plate 442, and the extending portion 9C2 of the heat radiating member 9C form a cooling air flow path for cooling the light modulation device 441 and the polarizing plate 442. The cooling flow path is formed in a substantially cylindrical shape that is open at the top and bottom and surrounded in the horizontal direction by the light modulation device 441, the polarizing plate 442, and the heat radiating member 9C. Thereby, the amount of cooling air loss can be reduced, the amount of cooling air flowing through the flow path is increased, and more cooling air is cooled by the light modulator 441, the polarizing plate 442, and the heat radiating member 9C. Can be used.
Moreover, since the cooling channel is formed in a substantially cylindrical shape, the cooling air can be smoothly circulated without stagnation.
Furthermore, since the cooling air used for cooling generates an upward air flow that rises with heat, the ventilation of the cooling air is performed more smoothly.
Accordingly, the air permeability of the cooling air is improved, and the cooling air used for cooling the light modulation device 441, the polarizing plate 442, and the heat radiating member 9C is increased to further improve the cooling efficiency of the light modulation device 441 and the polarizing plate 442. can do.

[5. Fifth Embodiment]
Next, an optical device according to a fifth embodiment of the invention will be described. The optical device according to the fifth embodiment has substantially the same configuration as the optical devices according to the first to fourth embodiments described above, but the heat radiating member is attached to the light beam incident surface of the light modulation device, and the light flux It is different in that it is composed of a second heat radiating plate attached to the emission surface.

FIG. 20 is an exploded perspective view of a heat dissipation member 9D according to the fifth embodiment of the present invention.
As shown in FIG. 20, the heat radiating member 9D includes a first heat radiating plate 9D1 and a second heat radiating plate 9D2. Such 1st heat sink 9D1 and 2nd heat sink 9D2 can be formed with the same material as the above-mentioned heat radiating member 9. FIG.

The first heat radiating plate 9D1 is a member attached to the light incident side surface of the light modulation device 441 (441R, 441G, 441B), and the heat generated by the liquid crystal panels 441R1, 441G1, 441B1 of the light modulation device 441 is It is conducted and radiated through the first holding frame 447A.
The first heat radiating plate 9D1 is formed with a substantially rectangular positioning portion 9D11 and an extending portion 9D12 erected in the out-of-plane direction from both ends in the width direction (X-axis direction) of the positioning portion 9D11.

The positioning portion 9D11 is a portion that positions the first heat radiating plate 9D1 with respect to the light modulation device 441. The positioning portion 9D11 is formed with a positioning surface 9D111 that is in contact with the light incident surface of the light modulation device 441 so as to allow heat conduction, an opening 9D112, and four holes 9D113.
Among these, the opening 9D112 is formed with substantially the same size at the position of the first heat radiating plate 9D1 corresponding to the opening 447A1 formed in the first holding frame 447A of the light modulation device 441 to which the first heat radiating plate 9D1 is attached. Has been. The opening 9D112 is an opening that transmits a light beam incident on the light modulation device 441, and has substantially the same shape as an opening (not shown) that forms a light beam incident surface of the light modulation device 441.
The holes 9D113 are holes formed so as to penetrate the positioning portions 9D11 at the four corners of the positioning portions 9D11 when the positioning portions 9D11 are viewed from the illumination optical axis direction (Z-axis direction). The hole 9D113 is a hole through which a pin spacer 449 for holding the light modulation device 441 by the holding member 448 is inserted.
Therefore, the positioning surface 9D111, the opening 9D112, and the hole 9D113 position the first heat radiating plate 9D1 with respect to the light modulation device 441, and the first heat radiating plate 9D1 is bonded and fixed to the pin spacer 449.

  The extending portions 9D12 extend so as to face each other in the out-of-plane direction (the direction opposite to the Z-axis direction) from both ends in the width direction of the surface opposite to the positioning surface 9D111 of the positioning portion 9D11. That is, these extending portions 9D12 are formed so as to cover both side surfaces in the width direction of the polarizing plate 442 disposed in the previous stage of the light modulation device 441.

The second heat radiating plate 9D2 is a member attached to the surface of the light modulation device 441 on the light beam exit side, and the heat generated by the light modulation device 441 is the same as that of the first heat radiating plate 9D1. 2 Conducted through the holding frame 447B and dissipated.
Similar to the first heat radiating plate 9D1, the second heat radiating plate 9D2 includes a substantially rectangular positioning portion 9D21 and both ends of the positioning portion 9D11 in the width direction (X-axis direction) in the out-of-plane direction (Z-axis direction). An extending portion 9D22 that stands and extends downward is formed.

The positioning portion 9D21 is a portion for positioning the second heat radiating plate 9D2 on the surface on the light beam emission side of the light modulation device 441, and is positioned so as to be in contact with the surface on the light beam emission side of the light modulation device 441 so as to allow heat conduction. Surface 9D211 and openings 9D212 and 9D213 are formed.
Among these, the opening 9D212 is formed at the position of the positioning portion 9D21 corresponding to the opening 447B1 formed in the second holding frame 447B of the light modulation device 441. The opening 9D212 is an opening through which the light beam emitted from the light modulation device 441 is transmitted.
The opening 9D213 is formed at both ends of the positioning portion 9D21 in the width direction (X-axis direction) above the opening 9D212. The opening 9D213 is fitted with a portion formed in the second holding frame 447B of the light modulation device 441 and having a hole 447B3 through which the pin spacer 449 is inserted.
Accordingly, the positioning of the second heat radiating plate 9D2 with respect to the light modulation device 441 is performed by the positioning surface 9D211 and the opening 9D213.

  As described above, the extending portion 9D22 is a portion that stands up so as to face each other in the out-of-plane direction (Z-axis direction) of the surface opposite to the positioning surface 9D211 of the positioning portion 9D21 and extends downward. is there. That is, the extending portion 9D22 is formed so as to cover both side surfaces in the width direction of the second optical conversion plate 443B disposed at the rear stage of the light modulation device 441. The length dimension in the height direction (Y-axis direction) of the extending portion 9D22 is substantially the same as the length dimension in the height direction of the first heat radiating plate 9D1.

According to the heat dissipating member 9D having such a configuration, the heat dissipating members 9A, 9B, and 9C of the second to fourth embodiments can have substantially the same effects, and the following effects can be achieved. .
That is, by attaching the heat radiating member 9D to the light modulation device 441, the heat generated in the light modulation device 441 is conducted to the first heat radiating plate 9D1 and the second heat radiating plate 9D2 constituting the heat radiating member 9D. The heat radiation area of the device 441 can be increased. Here, the first and second heat radiating plates 9D1 and 9D2 are attached to the light incident side surface and the light emission side surface of the light modulation device 441, respectively. The side surface can be cooled uniformly. Therefore, damage, thermal degradation, etc. of the light modulation device 441 can be further suppressed, the product life can be extended, and stable optical image formation can be realized.

The extending portion 9D12 of the first heat radiating plate 9D1 covers the side surface in the width direction of the polarizing plate 442 disposed in the front stage of the light modulation device 441. In addition, the extending portion 9D22 of the second heat radiating plate 9D2 covers the side surface in the width direction of the second optical conversion plate 443B disposed in the rear stage on the optical path of the light modulation device 441. As a result, the first heat radiating plate 9D1 and the polarizing plate 442 form a substantially cylindrical cooling channel that is open at the top and bottom and surrounded in the horizontal direction. Similarly, a similar substantially cylindrical cooling air flow path is formed by the second heat radiating plate 9D2 and the second optical conversion plate 443B.
According to this, the light modulation device 441, the polarizing plate 442, the second optical conversion without leaking the cooling air supplied from the lower side of the light modulation device 441 and divided into the light beam incident side and the light beam emission side of the light modulation device 441. The plate 443B and the heat radiating member 9D can be used for cooling. Moreover, since the cooling flow path is formed in a substantially cylindrical shape, it is possible to improve the ventilation of cooling air that cools the light modulation device 441, the optical components 442, 443B, and the heat dissipation member 9D. Further, since the cooling air used for cooling is heated and generates an upward air flow, it is between the polarizing plate 442 and the light modulation device 441 and between the light modulation device 441 and the second optical conversion plate 443B. The cooling air flowing through the light modulation device 441 and the optical components 442 and 443B along the light modulation device 441 and the cooling air flowing upward can be further improved, and the flow amount of the cooling air can be increased.
Therefore, the light modulation device 441 and the optical components 442 and 443B can be cooled more efficiently.

[6. Modification of Embodiment]
The present invention is not limited to the above-described embodiments, 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 second to fourth embodiments, the heat radiating members 9 </ b> A, 9 </ b> B, and 9 </ b> C are disposed below the light modulation device 441, and the air guide plate 74 for blowing cooling air to the light modulation device 441 and the polarizing plate 442. The guide portions 9A21, 9B3, 9C21, and 9C3 surrounding the openings 74R1, 74G1, and 74B1 are formed. However, even if such guide portions are formed on the heat dissipating members 9 and 9D shown in the first and fifth embodiments, the guide portions 9A21, 9B3, 9C21, and 9C3 are formed. Good. In this case, substantially the same effect as the guide portions 9A21, 9B3, 9C21, 9C3 formed on the heat radiating members 9A, 9B, 9C can be obtained.

  In the first embodiment, the heat radiating member 9 is attached to the light incident side surface of the light modulation device 441. However, it may be attached to the light emitting side surface. In this case, the light modulation device 441 and the polarizing plate 442 can be effectively cooled. In the second to fourth embodiments, the heat dissipating members 9A, 9B, and 9C are attached to the light emission side surface of the light modulator 441, but may be attached to the light incident side surface. In this case, the light modulation device 441 and the optical conversion plate 443 can be efficiently cooled.

  In the first to fourth embodiments, the extending portions 92, 9 A 2, 9 B 2, and 9 C 2 extending from the width direction end portions of the heat radiating members 9, 9 A, 9 B, and 9 C have the illumination optical axis direction (Z-axis direction) or Although it extends in the direction opposite to the illumination optical axis direction, it may be formed so as to extend in both directions. In this case, by attaching each heat radiating member 9, 9A, 9B, 9C to the light modulation device 441, the polarizing plate 442 and the optical conversion plate 443 arranged at the front stage and the rear stage of the light modulation device 441 are combined into one heat radiation. It can be cooled with a member.

  In each of the embodiments described above, the heat radiating members 9, 9A, 9B, 9C, and 9D are attached to the light modulators 441R, 441G, and 441B, respectively, but are attached only to the light modulators that receive color light whose remarkably high temperature is incident. You may do it.

In each of the above-described embodiments, only the example of the projector using the three light modulation devices 441R, 441G, and 441B has been described, but the present invention can also be applied to a projector using four or more light modulation devices.
In each of the above embodiments, the light modulation device 441 (441R, 441G, 441B) uses the liquid crystal panels 441R1, 441G1, 441B1 as light modulation elements. An element may be used.
Further, in each of the above embodiments, a transmissive liquid crystal panel having a different light incident surface and light emitting surface is used as the liquid crystal panel, but a reflective liquid crystal panel in which the light incident surface and the light emitting surface are the same. May be used.
In addition, in each of the above embodiments, only an example of a front type projector that performs projection from the direction of observing the screen is given, but the present invention is a rear type that projects from the opposite side to the direction of observing the screen. It can also be applied to a projector.

  The present invention can be used for a projector, and also includes a light modulation element that modulates an incident light beam according to image information to form an optical image, and is disposed in the front stage or the rear stage of the light modulation element. It can utilize for an optical apparatus provided with the optical element which performs optical conversion.

1 is a perspective view of a projector according to a first embodiment of the present invention as viewed from above. The perspective view which looked at the projector in the embodiment from the lower part. The perspective view showing the internal structure of the projector in the said embodiment. The perspective view showing the internal structure of the projector in the said embodiment. FIG. 2 is a schematic diagram illustrating a structure of an optical system of a projector in the embodiment. The perspective view which looked at the optical apparatus in the said embodiment from upper direction. The perspective view which looked at the optical apparatus in the said embodiment from the downward direction. The disassembled perspective view which shows the structure of the optical apparatus in the said embodiment. The perspective view which looked at the holding member in the said embodiment from the light beam entrance side. The perspective view which looked at the heat radiating member in the said embodiment from the light beam entrance side. (A) The perspective view which looked at the prism base in the said embodiment from upper direction. (B) The perspective view which looked at the prism base in the said embodiment from the downward direction. (A) The perspective view which looked at the thermal radiation block in the said embodiment from upper direction. (B) The perspective view which looked at the thermal radiation block in the said embodiment from the downward direction. The perspective view which looked at the duct in the said embodiment from the downward direction. The perspective view which looked at the duct and the baffle plate in the said embodiment from upper direction. The schematic diagram which shows the cooling flow path in the said embodiment. The perspective view which shows the optical apparatus which concerns on 2nd Embodiment of this invention. The perspective view which looked at the heat radiating member in the said embodiment from the light beam emission side. The perspective view which shows the heat radiating member which concerns on 3rd Embodiment of this invention. The perspective view which shows the thermal radiation member which concerns on 4th Embodiment of this invention. The perspective view which shows the heat radiating member which concerns on 5th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 44, 44A ... Optical apparatus, 411 ... Light source apparatus, 441 (441R, 441G, 441B) ... Light modulation apparatus, 442 ... Polarizing plate (optical element), 443 ... Optical conversion board (optical element), 443B ... 2nd optical conversion board (optical element), 7 ... Cooling means, 9, 9A, 9B, 9C, 9D ... Radiating member, 91, 9A1, 9B1, 9C1, 9D11, 9D21 ... Positioning part, 92, 9A2, 9B2, 9C2 , 9D12, 9D22 ... Extension part, 93 ... Connection part, 9A12, 9B12, 9C12, 9D112, 9D212 ... Opening part, 9A21 ... Guide part (first guide part), 9B3 ... Guide part (second guide part) , 9C21 ... 1st guide part (1st guide part), 9C3 ... 2nd guide part (2nd guide part).

Claims (8)

A light modulation device that modulates a light beam emitted from a light source according to image information, an optical element that is disposed in the front stage or the rear stage of the light modulation device and that optically converts an incident light beam, and is attached to the light modulation device An optical device comprising a heat dissipating member,
The heat dissipating member is in contact with either the light incident side surface or the light exit side surface of the light modulation device so as to be capable of heat conduction, and a positioning unit that positions the light modulation device; An optical device comprising: an extension portion extending from the end portion toward the optical element and covering a side surface rising from an end portion in the width direction of the surface on the light beam incident side of the optical element. The optical device according to claim 1.
Two positioning portions of the heat radiating member are provided, and are in contact with both ends of the same plane of the light modulation device,
The extending part of the heat radiating member covers the side surface rising from the end in the width direction of the light incident side surface of the light modulator and extends from the positioning part toward the optical element. Optical device characterized. The optical device according to claim 2.
The heat radiating member includes a connecting portion that connects the positioning portions.
The optical device is characterized in that the connecting portion is formed in accordance with the shape of the upper surface of the light modulation device, and the lower surface of the connecting portion is in contact with the upper surface of the light modulation device. The optical device according to claim 1.
The optical device is characterized in that the positioning portion of the heat radiating member has an opening through which a light beam passes at a position substantially coincident with a light beam incident surface or a light beam emission surface of the light modulation device. The optical device according to claim 4.
The extending portion of the heat radiating member covers a side surface rising from a width direction end portion of the light incident side surface of the light modulation device,
An optical device characterized in that a first guide portion is formed at the lower end of the extension portion so as to extend downward in the approaching direction and guide the air to the light modulation device. The optical device according to claim 4 or 5,
An optical system characterized in that a second guide portion is formed at the lower end of the positioning portion of the heat radiating member so as to extend downward along the forming direction of the positioning portion and guide air to the light modulation device. apparatus. A projector that modulates a light beam emitted from a light source according to image information to form an optical image, and magnifies and projects the optical image,
A projector comprising the optical device according to claim 1. The projector according to claim 7, wherein
A projector comprising cooling means for blowing cooling air along the surfaces of the light modulation device and the optical element inside the heat radiating member.

Images