JP2005338236A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of uniformly cooling an optical modulation element. <P>SOLUTION: The cooling device constituted in the projector includes a cooling fan sucking and discharging cooling air, and a discharge side duct 64 guiding the cooling air discharged by the cooling fan to the near position of a liquid crystal panel 441G functioning as the optical modulation element. The discharge side duct 64 has an inflow port for making the cooling air discharged by the cooling fan flow into the inside, and a green light side outflow port 642A1 for making the cooling air flow out in a direction nearly orthogonal to the circulating direction of the cooling air circulating inside and sending the cooling air to the liquid crystal panel 441G, and is constituted so that the cooling air may be sent to the liquid crystal panel 441G through the green light side outflow port 642A1 after the cooling air is made to circulate in a direction along the optical modulation surface of the liquid crystal panel 441G. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector.

2. Description of the Related Art Conventionally, there has been known a projector including a light modulation element that modulates a light beam emitted from a light source according to image information to form an optical image, and a projection optical device that magnifies and projects the modulated light beam.
Among these, the light modulation element absorbs a part of the light beam when modulating the light beam emitted from the light source. When the light modulation element absorbs a part of the light beam, the temperature of the light modulation element itself increases. In such a state, the light modulation element may be damaged by overheating.
For this reason, a projector having such a light modulation element inside has been proposed to have a cooling device in order to mitigate the temperature rise of the light modulation element (see, for example, Patent Document 1).

The cooling device described in Patent Document 1 includes a sirocco fan that sucks and discharges cooling air from the outside of the projector, and cooling air that is located below the light modulation element and is discharged from the sirocco fan to the lower side of the light modulation element. It consists of a duct that leads.
Among these, the duct is an inlet that allows cooling air discharged from the sirocco fan to flow into the interior, and is formed at a position below the light modulation element, and causes the cooling air inside to flow out from below to above the light modulation element. Has an outlet. In the duct, the cooling air circulates in a direction substantially orthogonal to the light modulation surface of the light modulation element (the optical axis direction of the light beam emitted from the light source and incident on the light modulation element), and then passes through the outlet. The air is blown upward from below the modulation element. With such a cooling device, the light modulation element is forcibly cooled while ensuring the quietness of the projector.
JP 2003-215701 A (FIG. 12)

  However, in the cooling device described in Patent Document 1, the duct circulates cooling air in a direction substantially orthogonal to the light modulation surface of the light modulation element and then blows the light to the light modulation element through the outlet. Cooling air is likely to be blown locally to the modulation element. For example, the cooling air is likely to be blown upward from below only in a predetermined region in the left-right width direction of the light modulation element. For this reason, it is difficult to cool the light modulation element uniformly.

  An object of the present invention is to provide a projector capable of uniformly cooling a light modulation element.

The projector of the present invention includes a light source device, a light modulation element that modulates a light beam emitted from the light source device according to image information, a projection optical device that enlarges and projects the light beam modulated by the light modulation element, A projector comprising: a cooling device that blows cooling air toward the light modulation element and cools the light modulation element, wherein the cooling device sucks and discharges the cooling air; and the cooling fan A discharge-side duct that guides the cooling air discharged at the position close to the light modulation element, and the discharge-side duct is configured to flow into the cooling air discharged from the cooling fan. And a direction along the light modulation surface of the light modulation element, having an outflow port for flowing out the cooling air in a direction substantially orthogonal to the flow direction of the cooling air flowing through the inside and blowing the cooling air to the light modulation element After circulating the cooling air, characterized by blowing cooling air to the light modulation element via the outlet.
Here, the direction along the light modulation surface of the light modulation element means a direction along a plane perpendicular to the optical axis of the light beam emitted from the light source device and incident on the light modulation element.
In the present invention, the outlet of the discharge side duct constituting the cooling device causes the cooling air to flow out in a direction substantially perpendicular to the flow direction of the cooling air flowing through the inside. The discharge-side duct circulates cooling air in a direction along the light modulation surface of the light modulation element, and then blows the cooling air to the light modulation element through the outlet. For this reason, the cooling air flowing out through the outlet is in the flow direction with respect to the direction perpendicular to the flow direction of the cooling air flowing through the discharge side duct in the plane including the light modulation surface of the light modulation element. It will be distributed with an inclination. For example, when the cooling air flows from the lower side to the upper side of the light modulation element, the cooling air is directed from the lower corner part of the light modulation element to the upper corner part that is a diagonal position of the corner part. It will be distributed with an inclination. Therefore, it is not a configuration in which the cooling air is easily blown only to a predetermined region in the left-right width direction of the light modulation element as in the conventional case, but a configuration in which the cooling air can be blown over the entire light modulation surface of the light modulation element. The light modulation element can be uniformly cooled, and the product life of the projector can be extended.

In the projector according to the aspect of the invention, the end position of the upstream side in the flow direction of the cooling air flowing through the inside of the discharge side duct may be more planar than the end position of the upstream side in the flow direction of the light modulation element. It is preferable that the edge position on the upstream side in the flow direction is formed on the downstream side in the flow direction in a plan view than the substantially central position in the flow direction in the light modulation element.
In the present invention, by forming the outflow port as described above, the outflow port is arranged on the upstream side in the flow direction of the cooling air flowing through the inside of the discharge side duct with respect to the light modulation element in a plan view. For this reason, after passing through the outlet, in the plane including the light modulation surface of the light modulation element, the flow direction is inclined with respect to the direction perpendicular to the flow direction of the cooling air flowing through the discharge side duct. The circulating cooling air can be more effectively blown over the entire light modulation surface of the light modulation element, and the light modulation element can be cooled more uniformly.

In the projector according to the aspect of the invention, the light modulation element includes a plurality of light sources, and the discharge-side duct includes a plurality of circulation portions that respectively guide cooling air to positions near the plurality of light modulation elements. At least one of the flow sections circulates cooling air in a direction along the light modulation surface of the light modulation element corresponding to the flow section, and then supplies the cooling air to the light modulation element via the outlet. It is preferable to blow air.
According to the present invention, after at least one of the plurality of circulation portions constituting the discharge side duct circulates the cooling air in the direction along the light modulation surface of the light modulation element corresponding to the circulation portion. Since the cooling air is blown to the light modulation element via the outflow port, each light modulation element can be efficiently cooled even when a plurality of light modulation elements are configured.

In the projector according to the aspect of the invention, the plurality of light modulation elements include three light beams corresponding to red light having a red wavelength region, green light having a green wavelength region, and blue light having a blue wavelength region. The plurality of flow sections include a first flow section that guides cooling air to a position in the vicinity of the light modulation element that generates the largest amount of heat among the three light modulation elements, and the first flow section Has the outlet at a position in the vicinity of the light modulation element having the largest amount of heat generation, and after circulating cooling air in a direction along the light modulation surface of the light modulation element having the largest amount of heat generation, Preferably, the cooling air is blown to the light modulation element that generates the largest amount of heat.
In the present invention, after the first circulation part constituting the plurality of circulation parts circulates the cooling air in the direction along the light modulation surface of the light modulation element having the largest calorific value among the three light modulation elements, the outlet Then, cooling air is blown to the light modulation element. For this reason, among the three light modulation elements, the light modulation element that generates the largest amount of heat can be cooled particularly effectively. In addition, the distribution unit corresponding to another light modulation element having a relatively small calorific value may adopt the same configuration as the first distribution unit, or may adopt another configuration. The degree of freedom of design is improved.

  In the projector according to the aspect of the invention, the plurality of light modulation elements include three light beams corresponding to red light having a red wavelength region, green light having a green wavelength region, and blue light having a blue wavelength region. A color combining optical device configured to combine the light beams modulated by the three light modulation elements and having three light beam incident side end faces for attaching the three light modulation elements, respectively, The light modulation elements corresponding to the blue light and the light modulation elements corresponding to the blue light are respectively attached to the opposite end surfaces of the light beam incident side of the color synthesis optical device, and the plurality of circulation portions are connected to the green light. Both the first flow part for guiding the cooling air to the position near the corresponding light modulation element, the position near the light modulation element corresponding to the red light, and the position near the light modulation element corresponding to the blue light Cold A second circulation part for guiding air, wherein the first circulation part has the outlet at a position near the light modulation element corresponding to the green light, and the light modulation element corresponding to the green light Cooling air is circulated in a direction along the light modulation surface, and then the cooling air is blown to the light modulation element corresponding to the green light through the outflow port. An outflow port for allowing cooling air to flow out in a direction substantially perpendicular to the flow direction of the cooling air flowing inside the light modulation element corresponding to the blue light and corresponding to the red light and the blue light. Cooling air is circulated in a direction substantially orthogonal to the light modulation surface of each light modulation element, and then the cooling air is supplied to each of the light modulation elements corresponding to the red light and the blue light through the outlets, respectively. It is preferable to blow.

In the present invention, the first flow portion constituting the discharge side duct corresponds to the green light through the outlet after flowing the cooling air in the direction along the light modulation surface of the light modulation element corresponding to the green light. Cooling air is blown to the light modulation element. For this reason, of the three light modulation elements, the light modulation element corresponding to the green light that tends to generate the largest amount of heat can be uniformly cooled as described above.
In addition, each light modulation element corresponding to red light and blue light tends to generate less heat than the light modulation element corresponding to green light. For this reason, the ventilation structure different from the ventilation structure of the cooling air by the 1st distribution part can be adopted as the 2nd distribution part. Here, the respective light modulation elements corresponding to the red light and the blue light are respectively attached to the opposed light beam incident side end faces of the color combining optical device. For this reason, it arrange | positions so that it may planarly straddle each light modulation element corresponding to red light and blue light as a 2nd distribution part, and it is substantially orthogonal to the light modulation surface of each light modulation element corresponding to red light and blue light After the cooling air is circulated in the direction of the cooling air, the cooling air can be blown to each of the light modulation elements through each outlet. Thus, since each circulation part which sends cooling air to each light modulation element corresponding to red light and blue light can be made common, the discharge side ducts can be gathered together in a compact manner, and the projector can be miniaturized.
Furthermore, since the discharge-side duct is composed of two parts, the first circulation part and the second circulation part having independent flow paths as described above, according to the heat generation amounts of the three light modulation elements, the cooling device Two cooling fans may be provided. For this reason, even when the number of light modulation elements is three, the number of circulation parts and cooling fans constituting the cooling device can be reduced, and the projector can be reduced in size and weight.

In the projector according to the aspect of the invention, the projector includes an optical conversion element that is disposed opposite to the light modulation element on the upstream side and / or the downstream side of the light modulation element to convert the optical characteristics of the incident light beam, and the discharge side duct includes: Preferably, cooling air is blown to the light modulation element and the optical conversion element.
According to the present invention, since the discharge side duct blows cooling air to both the light modulation element and the optical conversion element disposed opposite to the light modulation element, not only the light modulation element but also the optical conversion element is uniform. The projector can be cooled down and the product life of the projector can be extended.

In the projector according to the aspect of the invention, the discharge side duct may include cooling air that flows out through the outlet to a position that planarly partitions the light modulation element and the optical conversion element. It is preferable that a rectifying rib for diverting to the element side is formed.
According to the present invention, since the rectifying rib is formed in the discharge side duct, changing the shape and forming position of the rectifying rib changes the amount of air blown to the light modulation element and the optical conversion element. The For this reason, both the light modulation element and the optical conversion element can be cooled in a well-balanced manner by setting the shape and forming position of the rectifying rib according to the respective heat generation amounts of the light modulation element and the optical conversion element.

In the projector according to the aspect of the invention, the optical conversion element includes a light-transmitting substrate and an optical conversion film that is formed on the light-transmitting substrate and converts an optical characteristic of an incident light beam. It is preferable that the material is made of a material having a thermal conductivity of 5 W / (m · K) or more.
According to the present invention, since the translucent substrate constituting the optical conversion element is made of a material having a thermal conductivity of 5 W / (m · K) or more, the heat generated in the optical conversion film is translucent. Heat can be effectively radiated to the substrate, and the optical conversion element can be cooled more efficiently by using it together with forced cooling by a cooling device. For this reason, for example, it is possible to change the shape and forming position of the rectifying rib described above and reduce the flow rate diverted to the optical conversion element side, that is, increase the flow rate diverted to the light modulation element side. Even in a configuration in which both the light modulation element and the optical conversion element are cooled by the apparatus, the cooling efficiency of the light modulation element is not reduced.

In the projector according to the aspect of the invention, the light source device, the light modulation element, the projection optical device, and an external housing that houses and arranges the cooling device are included. The discharge duct is divided into two bodies, and It is preferable that any one of the two bodies of the discharge side duct is formed on the inner surface of the exterior housing.
According to the present invention, since one body of the discharge side duct formed in a divided manner is formed on the inner surface of the outer casing, compared with the configuration in which the discharge side duct and the outer casing are separate members, The number of parts is reduced, making it possible to reduce the size and weight of the projector and save resources.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Appearance structure]
FIG. 1 is a perspective view of the projector according to the present embodiment as viewed from the upper front side. FIG. 2 is a perspective view of the projector as viewed from the lower front side.
In FIG. 1 or FIG. 2, reference numeral 1 denotes a projector, which shows in detail an exterior case 2 as an exterior housing constituting the exterior of the projector 1.
The projector 1 modulates the light beam emitted from the light source according to the image information, and enlarges and projects it on a projection surface such as a screen. As shown in FIG. 1 or FIG. 2, the projector 1 includes an exterior case 2, an optical unit 4 not shown here, a power supply unit 5, and a cooling unit 6 as a cooling device.

As shown in FIG. 1 or FIG. 2, the outer case 2 is a synthetic resin casing having a substantially rectangular parallelepiped shape, and houses the main body portion of the projector 1. As shown in FIG. 1 or FIG. 2, the exterior case 2 includes an upper case 11 that covers the upper part of the projector 1 and a lower case 12 that covers the lower part of the projector 1. The upper case 11 and the lower case 12 are fixed by screws or the like, and are configured to be detachable as appropriate.
As shown in FIG. 1 or 2, the upper case 11 includes an upper surface portion 11A (FIG. 1) that constitutes the upper surface of the projector 1, and a front surface portion 11B that substantially hangs down from the upper surface portion 11A and constitutes the front surface of the projector 1. Side surface portions 11C and 11D that substantially hang down from the upper surface portion 11A and form the side surface of the projector 1 and a back surface portion (not shown) that substantially hangs down from the upper surface portion 11A and forms the back surface of the projector 1 are configured.

Among these, on the upper surface portion 11 </ b> A, an operation panel 13 for performing start-up / adjustment operation of the projector 1 is provided on the rear right side portion as shown in FIG. 1. The operation panel 13 has a plurality of operation buttons 131, and an operation signal is output to a control board (not shown) disposed inside the operation panel 13 by appropriately pressing these operation buttons 131.
Moreover, as shown in FIG. 1, the notch 14 is formed in the front right side part in 11 A of upper surfaces. The notch 14 exposes a later-described projection lens lever of the optical unit 4 so that the lever can be operated.

As shown in FIG. 1 or FIG. 2, an exhaust port 16 is formed on the left side of the front surface portion 11 </ b> B as viewed from the front, and air exhausted from a cooling fan (not shown) disposed inside passes through the exhaust port 16. Is discharged through. The exhaust port 16 is formed with a plurality of blades 161 extending in the left-right direction and arranged in parallel. The vane plate 161 rectifies the discharged air and has a light shielding function between the inside and outside of the projector 1.
Further, as shown in FIG. 1 or 2, a remote controller storage portion 17 that allows the remote controller 9 to be inserted and removed in the front-rear direction (projection direction) of the projector 1 is formed on the front surface portion 11 </ b> B above the exhaust port 16. Has been. The remote controller 9 has a plurality of operation buttons (not shown) that perform power on / off of the projector 1, playback / stop of images, adjustment of volume, and the like. When a plurality of operation buttons are operated, an operation signal is transmitted from the separated position, and the projector 1 is remotely operated.

Further, as shown in FIG. 1 or FIG. 2, a substantially circular notch 18 is formed on the right side of the front portion 11B as viewed from the front. And the front-end | tip part of the projection lens mentioned later of the optical unit 4 is exposed through this notch 18. As shown in FIG. In addition, a lens cover 19 having a shape corresponding to the shape of the notch 18 is detachably provided in the notch 18. Then, by attaching the lens cover 19 to the notch 18, the notch 18 is closed, and the tip portion of the projection lens, which will be described later, of the optical unit 4 is protected.
Furthermore, as shown in FIG. 1 or FIG. 2, a remote control light receiving window 20 is formed on the right side of the notch 18 when viewed from the front in the front surface portion 11B. A remote control light receiving module (not shown) that receives an operation signal from the remote controller 9 is arranged inside the remote control light receiving window 20.
A remote control light receiving module (not shown) is electrically connected to the control board, and an operation signal received by the remote control light receiving module is output to the control board. Although not shown, the remote control light receiving window and the remote control light receiving module are also provided on the back side of the projector 1. The projector 1 can be remotely operated from both the front and rear of the projector 1 using the remote controller 9.

Although not shown in the drawings, a plurality of connection terminals for inputting image signals, audio signals, and the like from external electronic devices are exposed to the back surface. An interface board (not shown) for processing a signal input from the connection terminal is disposed inside the back surface portion.
The interface board is electrically connected to the control board, and a signal processed by the interface board is output to the control board.

As shown in FIG. 2, the lower case 12 is erected from a bottom surface portion 12 </ b> A constituting the bottom surface of the projector 1 and an outer edge portion of the bottom surface portion 12 </ b> A, and a part of the front surface, a part of the side surface, and a rear surface of the projector 1. And a standing part 12B constituting a part.
Among these, in the bottom surface portion 12A, a region in a substantially rectangular shape in plan view extending from the front right side to the substantially central portion in the front-rear direction has a stepped shape that is recessed inward as shown in FIG. An air inlet 21 for sucking cooling air from the outside and cooling an optical device (to be described later) of the optical unit 4 is formed at the bottom. Further, an air filter 22 is provided inside the air inlet 21 at a position where the air filter 22 interferes with the air inlet 21 in a plan view to prevent dust from entering the inside. As shown in FIG. 2, the air filter 22 is attached so as to be insertable / removable from the front side of the upright portion 12 </ b> B, and is configured to be exchangeable as appropriate.

Further, in the bottom surface portion 12A, the region extending from the substantially central portion in plan view to the left rear side has a stepped shape that is recessed inward as shown in FIG. 2, and the cooling air is sucked into the stepped bottom portion from the outside. In addition, an air inlet 23 for cooling a light source device and the like to be described later of the optical unit 4 is formed. In addition, an air filter (not shown) is provided on the inner side of the air inlet 23 as in the case of the air inlet 21 described above.
Further, in the bottom surface portion 12A, there are an adjustment leg portion 24 that constitutes a leg portion of the projector 1, as shown in FIG. 25 and a fixed leg 26 are provided, respectively, and the projector 1 is grounded at three points of the adjusting legs 24 and 25 and the fixed leg 26.
Of these, the adjusting legs 24 and 25 are constituted by shaft-like members that protrude forward and backward from the bottom surface 12A in the out-of-plane direction, and the projector 1 projects in the front-rear direction and the left-right direction during projection. The tilt position can be adjusted.
Furthermore, in the bottom surface portion 12A, a rectangular opening 27 is formed at the left rear corner. In the opening 27, the above-described fixed leg portion 26 is integrally formed, and a lamp cover 28 that covers the opening 27 and that can replace a light source device (to be described later) of the optical unit 4 is detachably provided.
Although not shown, a plurality of ribs are formed inside the lower case 12 so that the main body portion of the projector 1 can be disposed. Further, the plurality of ribs and a part of the main body portion of the projector 1 are combined to form a discharge side duct, which will be described later, of the cooling unit 6. The detailed structure of the rib constituting the discharge duct will be described later.

[Internal configuration]
FIG. 3 is a diagram showing the internal structure of the projector 1. Specifically, FIG. 3 is a diagram in which the upper case 11 of the projector 1 is removed.
As shown in FIG. 3, the main body of the projector 1 is accommodated in the exterior case 2. And this main-body part is equipped with the optical unit 4, the power supply unit 5, and the cooling unit 6, as shown in FIG.
Although not shown, the optical unit 4 is configured above the optical unit 4 as a circuit board on which an arithmetic processing unit such as a CPU (Central Processing Unit) is mounted. The interface board, the remote control light receiving module, and the operation panel 13 are configured as described above. It is assumed that the control board for controlling the entire projector 1 based on a signal output from the above is disposed.

[Structure of optical unit 4]
FIG. 4 is a diagram schematically showing the optical system of the optical unit 4.
As shown in FIG. 3, the optical unit 4 extends along the back side of the exterior case 2 and has a substantially L shape in plan view with one end extending forward, and forms an optical image according to image information. The projection is enlarged. As shown in FIG. 4, the optical unit 4 is functionally large in an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, an optical device 44, and an optical component housing 45. Separated.
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. As shown in FIG. 4, the integrator illumination optical system 41 includes a light source device 411, a first lens array 412, a second lens array 413, a polarization conversion element 414, and a superimposing lens 415.

  As shown in FIG. 4, the light source device 411 includes a light source lamp 416 and a reflector 417 as a radiation light source. Then, 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 is emitted to the outside. In the present embodiment, a high-pressure mercury lamp is used as the light source lamp 416, and a parabolic mirror is used as the reflector 417. The light source lamp 416 is not limited to a high-pressure mercury lamp, and may be a metal halide lamp, a halogen lamp, or the like. Moreover, although the parabolic mirror is employ | adopted as the reflector 417, you may employ | adopt the structure which has arrange | positioned the collimating concave lens in the exit surface of the reflector which consists of an ellipsoidal mirror not only in this.

The first lens array 412 has a configuration in which small lenses having a substantially rectangular outline as 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 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 a liquid crystal panel (to be described later) of the optical device 44 together with the superimposing lens 415.

The polarization conversion element 414 converts the light from the second lens array 413 into substantially one type of polarized light, thereby improving the light use efficiency in the optical device 44.
Specifically, each partial light beam converted into approximately one type of polarized light by the polarization conversion element 414 is finally superimposed on a liquid crystal panel (described later) of the optical device 44 by the superimposing lens 415. In a projector using a liquid crystal panel of a type 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, the light beam emitted from the light source lamp 416 is converted into substantially one type of polarized light, and the light use efficiency in the optical device 44 is enhanced. Such a polarization conversion element 414 is introduced in, for example, Japanese Patent Application Laid-Open No. 8-304739.

As shown in FIG. 4, the color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423. The plurality of partial light beams emitted from the integrator illumination optical system 41 are separated into three color lights of red (R), green (G), and blue (B) by two dichroic mirrors 421.
As shown in FIG. 4, the relay optical system 43 includes an incident side lens 431, a relay lens 433, and reflection mirrors 432 and 434. The relay optical system 43 has a function of guiding red light, which is the color light separated by the color separation optical system 42, to a liquid crystal panel for red light, which will be described later, of the optical device 44.

  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 a liquid crystal panel for blue light described later. The field lens 418 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 liquid crystal panel for red light and green light.

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 a later-described green light liquid crystal panel. 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 a red light liquid crystal panel described later.
Note that the relay optical system 43 is used for red light because the length of the optical path of red light is longer than the length of the optical path of other color light, thereby preventing a decrease in light use efficiency due to light divergence or the like. It is to do. 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 enlarges and projects the formed color image. As shown in FIG. 4, the optical device 44 includes three liquid crystal panels 441 (red liquid crystal panel 441R, green light liquid crystal panel 441G, blue light liquid crystal panel 341B as light modulation elements. ), An incident-side polarizing plate 442 and an optical conversion plate 443 as an optical conversion element disposed opposite to the light incident side and the light emitting side of the liquid crystal panel 441, and a cross dichroic prism 444 as a color synthesizing optical device, respectively. And a head body 7 and a projection lens 8 as a projection optical device. Of these, the three liquid crystal panels 441, the three optical conversion plates 443, and the cross dichroic prism 444 are integrated to form an optical device body 440 (see FIG. 5). The optical device body 440 includes a holding frame for holding the liquid crystal panel 441 and a second optical conversion plate 443B in addition to the liquid crystal panel 441, the optical conversion plate 443, and the cross dichroic prism 444, although a specific configuration will be described later. A holding member that holds and attaches the liquid crystal panel 441 to the cross dichroic prism 444, a heat radiating member that radiates heat from the optical device main body 440, and a heat radiating block are provided.

The incident-side polarizing plate 442 receives light of each color whose polarization direction is aligned in approximately one direction by the polarization conversion element 414, and of the incident light beams, is substantially the same as the polarization axis of the light beams aligned by the polarization conversion element 414. Only polarized light in the direction is transmitted, and other light beams are absorbed. Although not shown, the incident side polarizing plate 442 has a configuration in which a polarizing film is pasted on a translucent substrate. In the present embodiment, the incident-side polarizing plate 442 is configured separately from the optical device main body 440, but a configuration integrated with the optical device main body 440 may be employed. In addition, a configuration in which a polarizing film is attached to the field lens 418 without using a light-transmitting substrate may be employed.
Although not shown, the liquid crystal panel 441 has a configuration in which liquid crystal, which is an electro-optical material, is hermetically sealed between a pair of transparent glass substrates. The orientation state is controlled, and the polarization direction of the polarized light beam emitted from the incident side polarizing plate 442 is modulated. The light modulation surface according to the present invention corresponds to a surface that is formed inside the liquid crystal panel 441 and faces the incident-side polarizing plate 442 or the optical conversion plate 443 in the liquid crystal panel 441.

As shown in FIG. 4, 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 configuration as the above-described incident-side polarizing plate 442, and transmits only polarized light in a predetermined direction among incident light beams and absorbs other light beams. . Although not shown in FIG. 4, the first optical conversion plate 443 </ b> A is transparent to the translucent substrate 443 </ b> A <b> 1 (see FIG. 5) and the polarization axis of the polarized light that is transmitted through the incident-side polarizing plate 442. In this state, a polarizing film 443A2 (see FIG. 5) is provided as an optical conversion film that is attached to the light beam incident side end face of the light transmitting substrate 443A1.
The translucent substrate 443A1 is a rectangular plate made of quartz. The translucent 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 the direction orthogonal to the optical axis. Have The translucent substrate 443A1 is preferably made of a material having a thermal conductivity of 5 W / (m · K) or more, and sapphire glass, YAG (Yttrium Aluminum Garnet), or the like can be employed in addition to the above crystal.
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.

The second optical conversion plate 443B transmits only polarized light in a predetermined direction among the light beams emitted from the liquid crystal panel 441, absorbs other light beams, and expands the viewing angle of the light beams emitted from the liquid crystal panel 441. To do. Although the second optical conversion plate 443B is not shown in FIG. 4, the same transparent substrate 443B1 (see FIG. 5) as the transparent substrate 443A1 (see FIG. 5) of the first optical conversion plate 443A, A polarizing film 443B2 (see FIG. 5) as an optical conversion film affixed to the end surface on the light emission side of the light transmitting substrate 443B1, and a field of view as an optical conversion film affixed to the end surface on the light incident side of the light transmission substrate 443B1. And an angle correction film 443B3 (see FIG. 5).
Among these, the polarizing film 443B2 is the same as the polarizing film 443A2 of the first optical conversion plate 443A, but has different light absorption characteristics. The polarizing film 443B2 is attached to the end surface on the light beam exit side of the translucent substrate 443B1 in a state where the polarization axis is parallel to the polarizing film 443A2.
The viewing angle correction film 443B3 compensates for birefringence generated in the liquid crystal panel 441. The viewing angle correction film 443B3 increases the viewing angle of the projected image and improves the contrast of the projected image.

The cross dichroic prism 444 is an optical element that synthesizes an optical image modulated for each color light emitted from the optical conversion plate 443 to form a color image. The cross dichroic prism 444 has a square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. These dielectric multilayer films reflect each color light emitted from the liquid crystal panels 441R and 441B via the optical conversion plate 443, and pass through the color light emitted from the liquid crystal panel 441G and the optical conversion plate 443. In this manner, the color lights modulated by the liquid crystal panels 441R, 441G, and 441B are combined to form a color image.
The detailed structure of the optical device body 440 in which the three liquid crystal panels 441, the three optical conversion plates 443, and the cross dichroic prism 444 are integrated will be described later.

The projection lens 8 is arranged such that the tip portion can be exposed from the cutout 18 of the exterior case 2 and enlarges and projects the color image formed by the cross dichroic prism 444. The projection lens 8 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical barrel. In addition, as shown in FIG. 1 or FIG. 3, the projection lens 8 includes a lever 8A that changes the relative positions of a plurality of lenses, and is configured to be able to adjust the focus and magnification of the projected image.
The head body 7 is made of a metal material such as an aluminum alloy or a magnesium alloy, and integrates the optical device main body 440 and the projection lens 8 and attaches the integrated unit to the optical component housing 45. is there. The detailed structure of the head body 7 will be described at the same time when the optical device body 440 is described.

The optical component casing 45 is a molded product made of synthetic resin, and as shown in FIG. 4, a predetermined illumination optical axis A is set inside, and the optical components 41 to 44 described above are predetermined with respect to the illumination optical axis A. Place in position. The optical component housing 45 is not limited to a synthetic resin molded product, but may be composed of a metal member. As shown in FIG. 3, the optical component housing 45 includes a component storage member 451 and a lid-like member 452.
As shown in FIG. 3, the component storage member 451 stores a light source storage portion 451A in which the light source device 411 (FIG. 4) is stored, and other optical components 41 to 43 and 442 (FIG. 4) excluding the light source device 411. The component storage unit 451B is provided.
Although the light source storage portion 451A is not specifically illustrated, the lower side is open, and the light source device 411 (FIG. 4) is stored and disposed through the opening. In addition, an opening is formed in a connection portion with the component storage unit 451B so that a light beam emitted from the light source device 411 (FIG. 4) passes therethrough.

Although not specifically shown, the component storage unit 451B is formed in a container shape having an upper side opened, one end side connected to the light source storage unit 451A, and the other end side being substantially U-shaped in plan view. The optical device main body 440 and a part of the head body 7 are disposed in the U-shaped inner portion on the side in a plan view. That is, in a state where the optical device main body 440 is disposed in the optical component casing 45, the lower side of the optical device main body 440 is opened.
In this component storage portion 451B, although not shown in the drawings on the inner side surface of the side surface, a plurality of groove portions are formed, and the optical components 412 to 415, 418, 421 to 423, 431 to 434 described above are formed in the groove portions. , 442 are slidably fitted from above.
Further, in the component storage portion 451B, a support portion 451B1 for supporting and fixing a unit in which the optical device main body 440 and the projection lens 8 are integrated by the head body 7 is formed at the U-shaped tip portion (FIG. 3). Or refer to FIG.
The support portion 451B1 corresponds to the outer peripheral shape of a lens support portion, which will be described later, of the head body 7, and has a U-shape that opens upward when viewed from the front (see FIG. 8). A unit support surface 451B2 that supports a pair of upstanding pieces of a lens support portion (described later) of the head body 7 is formed at the U-shaped tip portion of the support portion 451B1 (see FIG. 3 or FIG. 8). The pair of upright pieces of the head body 7 is supported and fixed on the unit support surface 451B2, so that the unit in which the optical device main body 440 and the projection lens 8 are integrated by the head body 7 is an optical component housing 45. Is installed at a predetermined position.

  The lid-like member 452 corresponds to the planar shape of the component storage portion 451B, and closes the opening portion on the upper side of the component storage portion 451B. That is, when the optical device main body 440 is disposed in the optical component casing 45, the upper side of the optical device main body 440 is open.

[Structure of optical device main body and head body]
FIG. 5 is an exploded perspective view showing an assembly structure of the optical device main body 440 and the head body 7. In FIG. 5, only the red light side of the optical device main body 440 is shown and the green light side and the blue light side are omitted, but the same applies to the green light side and the blue light side.
As shown in FIG. 5, the optical device main body 440 includes a holding frame 445, a heat radiating member 446, a holding member 447, a spacer 448, in addition to the liquid crystal panel 441, the optical conversion plate 443, and the cross dichroic prism 444 described above. And a heat dissipation block 449.
Of the optical conversion plates 443 described above, the first optical conversion plate 443A is directly attached to the light beam incident side end surface of the cross dichroic prism 444, as shown in FIG.

The holding frame 445 is made of a heat conductive material and stores and holds the liquid crystal panel 441. As shown in FIG. 5, the holding frame 445 includes a holding frame main body 4451 and a pressing plate 4452.
The holding frame main body 4451 has an opening 4451A corresponding to the image forming area of the liquid crystal panel 441 at a substantially central portion in plan view, and is configured by a concave frame body in which a storage portion (not shown) is formed on the light beam emission side. The liquid crystal panel 441 is stored and held by the unit.
The pressing plate 4452 is formed of a rectangular plate having an opening 4252A corresponding to the image forming area of the liquid crystal panel 441 at a substantially central portion in plan view, and the liquid crystal panel 441 housed in the housing portion of the holding frame main body 4451 is formed. It press-fixes with respect to the said accommodating part.
As shown in FIG. 5, spacer insertion portions 4452B through which the spacers 448 can be inserted are formed at the four corners of the pressing plate 4452, respectively.
Then, the hooks 4451C formed on the left and right side edges of the holding frame main body 4451 are engaged with the hook engaging portions 4252C protruding from the left and right side edges of the pressing plate 4452, so that the liquid crystal panel 441 can hold the holding frame. It is stored and held in 445.
By storing and holding the liquid crystal panel 441 in such a holding frame 445, heat generated in the liquid crystal panel 441 is transmitted to the holding frame 445. For this reason, the cooling efficiency of the liquid crystal panel 441 can be improved.

The heat radiating member 446 is made of a heat conductive material, and is attached to the outer peripheral portion of the holding frame 445 so as to be able to transfer heat corresponding to the outer peripheral shape of the holding frame 445. And a U-shape in plan view that abuts against the left and right end portions, respectively.
In the heat radiating member 446, a flexible printed circuit board 441 </ b> C of the liquid crystal panel 441 can be inserted into an end portion of the heat radiating member 446 that is in contact with the upper end portion of the holding frame 445, as shown in FIG. 5. A board insertion portion 4461 is formed.
Further, in the heat radiating member 446, at the end contacting the left and right ends of the holding frame 445, as shown in FIG. 5, an extending portion 4462 extending from the light beam emitting side edge toward the light beam emitting side. Are formed respectively. With such a shape, in a state where the optical device main body 440 is assembled, the pair of extending portions 4462 of the heat radiating member 446 are arranged so as to cover the left and right end portions of the holding member 447 and are held by the holding frame 445. A substantially cylindrical space is formed between the panel 441 and the second optical conversion plate 443B held by the holding member 447. And the said cylindrical space becomes a flow path through which the cooling air blown in the cooling unit 6 distribute | circulates.

The holding member 447 is made of a heat conductive material, holds the second optical conversion plate 443, and holds the holding frame 445 via the spacer 448. As shown in FIG. 5, the holding member 447 is configured by a plate member having a rectangular frame shape in plan view having an opening 4471 that allows the first optical conversion plate 443A to be fitted therein.
In the holding member 447, projecting portions 4472 projecting from the end edge toward the light beam incident side are respectively formed on the left and right end edges as shown in FIG. Further, as shown in FIG. 5, each of the protruding portions 4472 has a rectangular extension portion 4473 in a rectangular shape in plan view extending toward the protruding portions 4472 facing each other. Has been. These four extending portions 4473 function as a portion that holds the second optical conversion plate 443B and holds the holding frame 445 via the spacer 448. That is, in the four extending portions 4473, the second optical conversion plate 443B is bonded and fixed to the end surface on the light beam exit side so as to be able to transfer heat, and the holding frame 445 is attached to the end surface on the light beam incident side through the spacer 448.

Further, in the holding member 447 described above, the first optical conversion plate 443A attached to the end surface on the light beam incident side of the cross dichroic prism 444 is fitted into the opening 4471 when the optical device main body 440 is assembled. Therefore, the heat generated in the first optical conversion plate 443A and the second optical conversion plate 443B is transmitted to the holding member 447. For this reason, the cooling efficiency of both the first optical conversion plate 443A and the second optical conversion plate 443B can be improved.
In a state where the optical device main body 440 is assembled, a predetermined gap is formed between the first optical conversion plate 443A and the second optical conversion plate 443B. Further, the left and right end portions of the first optical conversion plate 443A and the second optical conversion plate 443B are covered by a pair of protrusions 4472, and are substantially cylindrical between the first optical conversion plate 443A and the second optical conversion plate 443B. A space is formed. And the said cylindrical space becomes a flow path through which the cooling air blown in the cooling unit 6 distribute | circulates.

As shown in FIG. 5, the pin spacer 448 is composed of a synthetic resin rod-shaped member having thermal conductivity, and is composed of four corresponding to the four spacer insertion portions 4452 </ b> B of the holding frame 445. These pin spacers 448 are inserted into the spacer insertion portion 4442B of the holding frame 445 in a state where an adhesive is applied to the outer peripheral portion, and one end thereof is used as an adhesive on the light beam incident side end surface of the extending portion 4473 of the holding member 447. Fixed. As described above, the holding frame 445 is attached to the light flux incident side of the holding member 447 by the spacer 448.
Note that the pin spacer 448 is not limited to a synthetic resin having thermal conductivity, and may be made 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 heat dissipating block 449 is made of a heat conductive material, has a rectangular parallelepiped shape in plan view having an outer peripheral shape larger than the outer peripheral shape of the cross dichroic prism 444, and is attached to the upper surface of the cross dichroic prism 444.
The heat radiation block 449 has a recess on the lower surface thereof into which the cross dichroic prism 444 can be fitted. The heat dissipation block 449 is fitted and fixed to the upper surface of the cross dichroic prism 444. At this time, the heat dissipating block 449 is connected to the upper side end portion of the first optical conversion plate 443A attached to the light beam incident side end surface of the cross dichroic prism 444 so that heat can be transferred. In the assembled state of the optical device main body 440, the upper side of the end surface of the light emission side of the holding member 447 is fixed to each side surface of the heat radiation block 449 corresponding to the end surface of the light incident side of the cross dichroic prism 444 so that heat can be transferred. . Therefore, the heat generated in the first optical conversion plate 443A and the heat generated in the second optical conversion plate 443B and transmitted to the holding member 447 are transmitted to the heat dissipation block 449. Therefore, the cooling efficiency of both the first optical conversion plate 443A and the second optical conversion plate 443B can be further improved.
Further, in the heat dissipation block 449, a plurality of projecting portions 4491 projecting upward from the upper surface are formed on the upper surface, as shown in FIG. The plurality of protrusions 4491 expands the heat dissipation area of the heat dissipation block 449, and efficiently dissipates the heat transmitted to the heat dissipation block 449.

  As the holding frame 445, the heat radiating member 446, the holding member 447, and the heat radiating block 449, materials having high thermal conductivity are preferable. For example, invar and nickel-iron alloys such as 42Ni-Fe, magnesium alloys, aluminum alloys, A metal such as carbon steel or stainless steel, or a resin mixed with a carbon filler such as carbon fiber or carbon nanotube (polycarbonate, polyphenylene sulfide, liquid crystal resin, or the like) can be used. Note that the holding frame 445, the heat radiating member 446, the holding member 447, and the heat radiating block 449 may be made of the same material or different materials.

FIG. 6 is a perspective view showing a state where the optical device main body 440 is placed on the head body 7.
FIG. 7 is a perspective view showing a state where the optical device main body 440 and the projection lens 8 are integrated by the head body 7.
As shown in FIG. 5, the head body 7 has a substantially L shape in a side view, and each L-shaped end portion functions as a prism placement portion 71 and a lens support portion 72.
The prism mounting portion 71 is an L-shaped horizontal portion of the head body 7, has a substantially rectangular shape in plan view, and supports the optical device main body 440 as shown in FIG. 6. The prism mounting portion 71 has a rectangular outer diameter dimension in plan view that is set to be substantially the same as the outer diameter dimension of the heat dissipation block 449.
As shown in FIG. 5, the prism mounting portion 71 has a concave portion 711 formed on the top surface, and a spherical bulging portion 7111 formed at the substantially central portion of the bottom surface of the concave portion 711. The position of the cross dichroic prism 444 in the tilt direction with respect to the head body 7 can be adjusted by bringing the lower surface of the cross dichroic prism 444 into contact with the bulging portion 7111. At this time, the outer peripheral edge portion of the upper surface of the prism mounting portion 71 is connected to the lower end portion of the first optical conversion plate 443A attached to the light beam incident side end surface of the cross dichroic prism 444 so as to be capable of transferring heat. Further, in a state where the optical device main body 440 and the head body 7 are assembled, the lower side of the end surface on the light beam exit side of the holding member 447 is located on each side surface of the prism mounting portion 71 corresponding to the end surface on the light beam incident side of the cross dichroic prism 444. Fixed to allow heat transfer. Therefore, the heat generated in the first optical conversion plate 443A and the heat generated in the second optical conversion plate 443B and transmitted to the holding member 447 are transmitted to the prism placement portion 71 of the head body 7. For this reason, the cooling efficiency of both the first optical conversion plate 443A and the second optical conversion plate 443B can be further improved.

As shown in FIG. 5, the lens support portion 72 is an L-shaped vertical portion of the head body 7, has a substantially rectangular shape in plan view, supports the projection lens 8, and holds the optical device main body 440 and the projection lens 8. This is a portion for fixing the integrated unit to the optical component housing 45.
In the lens support portion 72, an opening 721 for transmitting a light beam is formed in a substantially central portion of the rectangular shape in plan view, as shown in FIG. Near the opening 721, two positioning convex portions 7211 for positioning the projection lens 8 at a predetermined position and four fixing holes 7212 for fixing the projection lens 8 are formed.
Here, a flange 81 is attached to the projection lens 8 at the light beam incident side end as shown in FIG. Although not shown, the flange 81 is provided with positioning holes and fixing holes corresponding to the positioning convex portions 7211 and the fixing holes 7212 of the lens support portion 72. Then, by positioning a projection 7211 for positioning in the positioning hole to position the projection lens 8 at a predetermined position of the lens support 72, and screwing the screw into the fixing hole 7212, As shown in FIG. 7, the projection lens 8 is fixed to the lens support portion 72 of the head body 7.

Further, in the lens support portion 72, the optical device main body 440 and the projection lens 8 are integrated on the upper side of the left and right end edges in the direction orthogonal to the left and right end edges as shown in FIG. Standing pieces 722 for attaching the unit to the support portion 451B1 (FIG. 3) of the optical component casing 45 are formed.
These standing pieces 722 have a lower end surface formed in a substantially flat shape, and the lower end surface abuts on the unit support surface 451B2 of the support portion 451B1. The unit in which the optical device main body 440 and the projection lens 8 are integrated is attached to the optical component housing 45 by screwing and fixing the upright piece 722 and the unit support surface 451B2 with screws or the like (not shown).

[Structure of power supply unit 5]
As shown in FIG. 3, the power supply unit 5 is arranged in an L-shaped inner portion of the optical unit 4 and supplies power to the light source device 411 and the control board. Although not shown, the power supply unit 5 includes a power supply block and a light source drive block.
The power supply block supplies power supplied from outside through a power cable (not shown) to the light source drive block, the control board, and the like.
The lamp driving block supplies power supplied from the power supply block to the light source device 411 constituting the optical unit 4 and is electrically connected to the light source lamp 416. Such a lamp driving block can be configured by wiring to a substrate, for example.

[Structure of cooling unit 6]
FIG. 8 is a diagram showing a configuration and an arrangement position of the cooling unit 6.
The cooling unit 6 introduces cooling air from the outside of the projector 1 to cool the inside of the projector 1. Hereinafter, the structure of the cooling unit 6 that mainly cools the liquid crystal panel 441, the incident-side polarizing plate 442, and the optical conversion plate 443 of the optical device 44 will be described. In addition, description is abbreviate | omitted about the structure of the cooling unit 6 which cools the light source device 411, the power supply unit 5, etc. FIG.
As shown in FIG. 8, the cooling unit 6 includes sirocco fans 62 and 63 as a pair of cooling fans, a suction side duct 61 disposed on a suction port side (not shown) of the pair of sirocco fans 62 and 63, and a pair The sirocco fans 62 and 63 have a discharge duct 64 disposed on the discharge port side (not shown).

  The suction side duct 61 is installed inside the bottom surface portion 12A corresponding to the air inlet 21 (FIG. 2) formed in the bottom surface portion 12A of the lower case 12, and is introduced into the projector 1 from the outside of the projector 1 through the air inlet 21. The cooled air is guided to the sirocco fans 62 and 63. The suction side duct 61 extends in a direction perpendicular to the projection direction, has an inlet (not shown) through which cooling air flows into the end surface facing the air inlet 21, and has internal cooling air at both ends in the extending direction. Each has an outlet (not shown) to be flowed out, and is formed in a substantially circular arc shape in cross section. Further, as shown in FIG. 8, the suction-side duct 61 has a concave curved side surface so as not to mechanically interfere with the projection lens 8.

  As shown in FIG. 8, the pair of sirocco fans 62 and 63 are respectively located on the sides of the projection lens 8, and the bottom surface of the lower case 12 is connected so that a suction port (not shown) is connected to each outlet of the suction duct 61. It is installed inside the part 12A. The sirocco fans 62 and 63 are driven and controlled by the control board. When driven, the sirocco fans 62 and 63 suck the cooling air outside the projector 1 through the intake port 21 and the suction duct 61, and the sucked cooling air is not shown. It discharges to the rear side along the bottom surface portion 12A of the lower case 12 from the discharge port.

FIG. 9 is a view showing the structure of the discharge side duct 64.
The discharge side duct 64 is disposed below the optical unit 4 as shown in FIG. The discharge-side duct 64 includes a first circulation part 64A that guides the cooling air discharged from the sirocco fan 62 to the lower side of the green light side of the optical device main body 440, and the cooling air discharged from the sirocco fan 63 to the optical device main body 440. And the second circulation part 64B that leads to the lower side of the red light side and the blue light side of the first and second cooling parts 64A and 64B. Let it flow out. As shown in FIG. 9, the first circulation part 64 </ b> A and the second circulation part 64 </ b> B are formed by combining a rib 641 formed inside the bottom surface part 12 </ b> A of the lower case 12 and a discharge side duct body 642. .

FIG. 10 is a view showing the structure of the rib 641.
As shown in FIG. 10, the rib 641 is erected upward from the inside of the bottom surface portion 12A of the lower case 12, and includes a first rib 641A constituting a part of the first flow portion 64A, and a second flow portion. It is comprised with the 2nd rib 641B which comprises some 64B.
As shown in FIG. 10, the second rib 641B is formed in an inner rib 641B1 formed so as to surround a part of the outer edge of the intake port 21, and in a direction away from the intake port 21 with a certain distance from the inner rib 641B1. And an outer rib 641B2.
One end of the inner rib 641B1 faces the side end of the sirocco fan 63 on the projection lens 8 side of the discharge port. The inner rib 641B1 extends from the one end to the rear side, and the tip end portion in the extending direction is bent approximately 90 ° to the left in FIG. 10, and the incident-side polarizing plate 442 on the blue light side of the optical device 44 It is formed in a substantially L shape in plan view extending to a lower position.
One end of the outer rib 641B2 faces the side end of the sirocco fan 63 on the side away from the projection lens 8 of the discharge port. The outer rib 641B2 has a substantially L shape in plan view like the inner rib 641B1, and the other end extends to a position below the first optical conversion plate 443A on the green light side of the optical device 44, and extends. The tip portion thus bent is bent toward the inner rib 641B1 and connected to the inner rib 641B1.
With such a shape, as shown in FIG. 10, the second rib 641B has a substantially container shape in which one end and an upper side are opened inside the inner rib 641B1, the outer rib 641B2, and the bottom surface portion 12A of the lower case 12. .

Similar to the second rib 641B, the first rib 641A includes an inner rib 641A1 and an outer rib 641A2, as shown in FIG.
One end of the inner rib 641A1 faces the side end of the sirocco fan 62 on the projection lens 8 side of the discharge port. The inner rib 641A1 extends rearward from the one end to a position below the incident-side polarizing plate 442 on the blue light side of the optical device 44.
One end of the outer rib 641A2 faces the side end portion of the sirocco fan 62 on the side away from the projection lens 8 of the discharge port. The outer rib 641A2 extends rearward from the one end, and the distal end portion in the extending direction is bent approximately 45 ° to the right in FIG. 10, and the bent distal end portion is incident on the green light side of the optical device 44. The side polarizing plate 442 is further bent and extended in a direction along the end surface on the light incident side or the end surface on the light exit side. Further, the extended tip portion is bent toward the outer rib 641B2 side of the second rib 641B and connected to the outer rib 641B2.
With such a shape, as shown in FIG. 10, the first rib 641A has an inner rib 641A1, an outer rib 641A2, an outer rib 641B2 of the second rib 641A, and an inner side of the bottom surface portion 12A of the lower case 12. It becomes a substantially container shape with an upper opening. Further, on the other end side of the outer rib 641A2, the liquid crystal panel 441G and the optical conversion plate 443 on the green light side in the optical device 44 are positioned in a plane so as to face the liquid crystal panel 441G and the optical conversion plate 443. Rectification ribs 641A3 extending in parallel with the direction (the direction in which the cooling air flows in the first circulation portion 64A) are formed.

11 and 12 are diagrams showing the structure of the discharge-side duct body 642. FIG. Specifically, FIG. 11 is a perspective view of the discharge-side duct body 642 as viewed from above. FIG. 12 is a perspective view of the discharge-side duct body 642 as viewed from below.
As shown in FIG. 11 or FIG. 12, the discharge-side duct body 642 includes a first duct 642A that constitutes a part of the first circulation part 64A, and a second duct 642B that constitutes a part of the second circulation part 64B. Is an integrally formed molded product made of synthetic resin, and is configured to be engageable with the rib 641.
As shown in FIG. 11 or FIG. 12, the first duct 642A has a substantially container shape that is open at one end and the lower side, as in the container shape formed by the first rib 641A and the inside of the bottom surface portion 12A of the lower case 12. Have Then, the discharge-side duct main body 642 and the rib 641 engage with each other so that the opening portion below the first duct 642A and the first rib 641A come into contact with each other, as shown in FIG. A distribution part 64A is formed. In addition, an opening portion at one end of the first duct 642A has a shape corresponding to the discharge port of the sirocco fan 62. For this reason, the opening at one end of the first flow part 64A in which the first duct 642A and the first rib 641A are combined has substantially the same shape as the discharge port of the sirocco fan 62, and can be connected to the discharge port.

In the first duct 642A, on the other end side of the upper surface, as shown in FIG. 11 or FIG. 12, the cooling air that has circulated through the first circulation portion 64A is directed upward from below the green light side of the optical device 44. A green light side outlet 642A1 having a substantially rectangular shape in plan view is formed.
Among the four edges of the green light side outlet 642A1, the edge on the other end side and the two edges substantially orthogonal to the edge on the other end side are directed upward as shown in FIG. And the cooling air flowing out from the green light side outlet 642A1 is rectified.
Further, in the first duct 642A, on the other end side inside the container-like shape, as shown in FIG. 12, rectifying ribs 642A2 are formed corresponding to positions where the rectifying ribs 641A3 of the first ribs 641A are formed.
The rectifying rib 642A2 has a shape substantially similar to the shape of the rectifying rib 641A3. Then, in a state where the discharge-side duct body 642 and the rib 641 are engaged, the lower edge of the rectifying rib 642A2 comes into contact with the upper edge of the rectifying rib 641A3. Further, as shown in FIG. 11 or FIG. 12, the rectifying rib 642A2 protrudes upward through the green light side outlet 642A1, and the cooling air flowing out from the green light side outlet 642A1 It is formed to rectify.

  As shown in FIG. 11 or FIG. 12, the second duct 642B is substantially in the shape of a container having an opening at one end and the lower side thereof, similar to the container shape formed by the second rib 641B and the inside of the bottom surface portion 12A of the lower case 12. Have Then, the discharge-side duct main body 642 and the rib 641 engage with each other so that the opening portion below the second duct 642B and the second rib 641B come into contact with each other, as shown in FIG. A distribution part 64B is formed. Further, the opening at one end of the second duct 642B has a shape corresponding to the discharge port of the sirocco fan 63. For this reason, the opening at one end of the second flow part 64B in which the second duct 642B and the second rib 641B are combined has substantially the same shape as the discharge port of the sirocco fan 63, and can be connected to the discharge port.

In the second duct 642B, on the upper surface, as shown in FIG. 11 or FIG. 12, the red light side incident side polarizing plate 442, the liquid crystal panel 441R, and the optical conversion plate 443 are positioned below the red light side of the optical device 44. A substantially rectangular red light side outflow port 642B1 extending in a direction orthogonal to the respective facing surfaces (extending direction of the second duct 642B) is formed. A part of the cooling air flowing through the second circulation part 64B flows out from the lower side to the upper side of the red light side of the optical device 44 through the red light side outlet 642B1.
Further, in the second duct 642B, on the other end side of the upper surface, as shown in FIG. 11, the cooling air flowing out through the red light side outlet 642B1 out of the cooling air flowing through the second circulation portion 64B. A blue light side outflow port 642B2 having a trapezoidal shape in plan view is formed to allow the cooling air to be removed to flow upward from below the blue light side of the optical device 44.
As shown in FIG. 11, the edge of the blue light side outlet 642B2 protrudes upward and is formed so as to rectify the cooling air flowing out from the blue light side outlet 642B2.
Further, in the second duct 642B, on the other end side inside the container shape, as shown in FIG. 12, the liquid crystal panel 441B and the optical conversion plate 443 on the blue light side in the optical device 44 are positioned in a plane. A rectifying rib 642B3 extending in parallel to the opposing surfaces of the liquid crystal panel 441B and the optical conversion plate 443 (a direction substantially orthogonal to the cooling air flow direction in the second flow portion 64B) is formed. Further, as shown in FIG. 11, the rectifying rib 642B3 is formed so that the upper edge protrudes upward via the blue light side outlet 642B2 and rectifies the cooling air flowing out from the blue light side outlet 642B2. Has been.

(Cooling structure)
Next, the cooling structure by the cooling unit 6 described above will be described.
FIG. 13 is a schematic view of the flow state of the cooling air in the discharge side duct 64 as seen in a plane.
Hereinafter, as described above, a cooling structure that mainly cools the liquid crystal panel 441, the incident-side polarizing plate 442, and the optical conversion plate 443 of the optical device 44 will be described. In addition, the description of the cooling structure for cooling the light source device 411 and the power supply unit 5 is omitted.
When the sirocco fans 62 and 63 are driven under the control of a control board (not shown), the cooling air outside the projector 1 is sucked into the sirocco fans 62 and 63 through the air inlet 21 and the suction side duct 61. Then, the cooling air discharged from the discharge ports (not shown) of the sirocco fans 62 and 63 is discharged from the opening at one end of the first flow portion 64A and the second flow portion 64B of the discharge side duct 64 as shown in FIG. It is introduced into the duct 64.
Hereinafter, the cooling structure on the red light side and the blue light side of the optical device 44 via the second circulation part 64B and the cooling structure on the green light side of the optical device 44 via the first circulation part 64A will be described in order.

[Cooling structure of red light side and blue light side]
FIG. 14 is a diagram schematically showing a cross section of the optical device 44 on the blue light side. Specifically, FIG. 14 is a diagram illustrating a cross section in a direction perpendicular to the facing surfaces of the blue light side liquid crystal panel 441B, the incident side polarizing plate 442, and the optical conversion plate 443.
As shown in FIG. 13, the cooling air RB introduced into the second circulation part 64B by the sirocco fan 63 circulates rearward according to the shape of the second circulation part 64B, then bends approximately 90 ° and is red. It circulates in a direction substantially orthogonal to the opposing surfaces of the incident side polarizing plate 442 on the light side and the blue light side, the liquid crystal panels 441R and 441B, and the optical conversion plate 443. At this time, the cooling air RB is divided into the cooling air R and the cooling air B by the red light side outlet 642B1 formed in the flow path as shown in FIG.
As shown in FIG. 13, the cooling air R flows out through the red light side outlet 642 </ b> B <b> 1 and then flows from the lower side to the upper side of the optical device 44. Then, the incident-side polarizing plate 442 on the red light side, the liquid crystal panel 441R, the optical conversion plate 443, and the like are cooled. The cooling structure on the red light side of the optical device 44 is substantially the same as the cooling structure on the blue light side of the optical device 44 described later (see below). Further, the cooling air R that has escaped above the red light side of the optical device 44 circulates along the lower surface of the control board disposed above the optical device 44, and circulates between the protrusions 4491 of the heat dissipation block 449. . Then, the heat dissipation block 449 is cooled.

As shown in FIG. 13, the cooling air B is guided to the other end side of the second circulation portion 64B. Then, as shown in FIG. 13 or FIG. 14, the cooling air B guided to the other end side is liquid crystal panel 441B side (cooling air B1) and optical conversion plate 443 side (cooling air B2) by the rectifying rib 642B3. To be diverted to
As shown in FIG. 14, the cooling air B1 flows out from the lower side of the holding frame 445 holding the liquid crystal panel 441B after flowing out through the blue light side outlet 642B2, and the luminous flux of the holding frame 445 enters. The side end face, the light incident side end face of the liquid crystal panel 441B, and the light exit side end face of the incident side polarizing plate 442 are cooled.
As shown in FIG. 14, the cooling air B <b> 2 flows out through the blue light side outlet 642 </ b> B <b> 2 and then flows upward from below the blue light side holding member 447. At this time, as shown in FIG. 14, the cooling air B <b> 2 is supplied to the light beam incident side (cooling air B <b> 21) and the light beam emission side of the second optical conversion plate 443 </ b> B by the second optical conversion plate 443 </ b> B held by the holding member 447. The air is diverted to (cooling air B22).

The cooling air B21 is introduced into the aforementioned substantially cylindrical space formed between the liquid crystal panel 441B and the second optical conversion plate 443B by the pair of extending portions 4462 of the heat dissipation member 446. Then, the cooling air B21 circulates in the space from the lower side to the upper side, and the light emission side end surface of the holding frame 445, the light emission side end surface of the liquid crystal panel 441B, the holding member 447, and the second optical conversion plate 443B. Cool the light incident side end face.
The cooling air B22 is introduced into the aforementioned substantially cylindrical space formed between the first optical conversion plate 443A and the second optical conversion plate 443B by the pair of protrusions 4472 of the holding member 447. Then, the cooling air B22 flows through the space from the lower side to the upper side, and cools the holding member 447, the light beam incident side end surface of the first optical conversion plate 443A, and the light beam emission side end surface of the second optical conversion plate 443B. To do.

[Green light side cooling structure]
FIG. 15 is a diagram schematically showing a cross section of the optical device 44 on the green light side. Specifically, FIG. 15 is a diagram illustrating a cross section in a direction along each facing surface of the liquid crystal panel 441G on the green light side, the incident-side polarizing plate 442, and the optical conversion plate 443.
As shown in FIG. 13, the cooling air G introduced into the first circulation part 64A by the sirocco fan 62 circulates rearward according to the shape of the first circulation part 64A and then bends approximately 45 °. It bends approximately 45 ° and circulates in the direction along the opposing surfaces of the incident-side polarizing plate 442 on the green light side, the liquid crystal panel 441G, and the optical conversion plate 443. At this time, as shown in FIG. 13, the cooling air G is divided into the liquid crystal panel 441G side (cooling air G1) and the optical conversion plate 443 side (cooling air G2) by the rectifying ribs 641A3 and 642A2.

  The cooling air G1, G2 is substantially the same as the cooling structure by the cooling air B1, B2 described above. That is, the cooling air G1 flows out from the lower side of the holding frame 445 upward after flowing out through the green light side outlet 642A1 in substantially the same manner as the cooling air B1 described above, and the light flux incident side of the holding frame 445 The end face, the light incident side end face of the liquid crystal panel 441G, and the light exit side end face of the incident side polarizing plate 442 are cooled. Further, the cooling air G2 flows out from the lower side of the holding member 447 upward and flows by the second optical conversion plate 443B after flowing out through the green light side outlet 642A1 in substantially the same manner as the cooling air B2 described above. The second optical conversion plate 443B is divided into the light beam incident side and the light beam emission side, and the light beam emission side end surface of the holding frame 445, the light beam emission side end surface of the liquid crystal panel 441G, the holding member 447, the second optical conversion plate 443B, and the second optical conversion plate 443B. 1 The light incident side end face of the optical conversion plate 443A is cooled.

The differences between the cooling air G1 and G2 from the cooling air B1 and B2 described above are as follows.
That is, after the cooling air B1 and B2 circulates in the direction substantially orthogonal to the respective facing surfaces of the incident-side polarizing plate 442 on the blue light side, the liquid crystal panel 441B, and the optical conversion plate 443 in the second circulation portion 64B, It flows out through the red light side outlet 642B1 and the blue light side outlet 642B2.
On the other hand, after the cooling air G1 and G2 circulates in the direction along the facing surfaces of the incident-side polarizing plate 442 on the green light side, the liquid crystal panel 441G, and the optical conversion plate 443 in the first circulation part 64A. Then, it flows out through the green light side outlet 642A1.
Therefore, as shown in FIG. 15, the cooling air G1 and G2 flows out through the green light side outlet 642A1, and then flows from below the green light side of the optical device 44 in the flow direction in the first flow portion 64A. It circulates upward while tilting.

Here, the edge position D1 on the upstream side of the flow path of the green light side outlet 642A1 is more than the end position S1 of the incident side polarizing plate 442, the liquid crystal panel 441G, and the optical conversion plate 443, as shown in FIG. It is formed on the upstream side of the flow path. Therefore, the cooling air G1 and G2 flowing out through the green light side outlet 642A1 in the vicinity of the edge position D1 of the green light side outlet 642A1 are incident side polarizing plate 442 and liquid crystal panel 441G as shown in FIG. In the vicinity of the end position S1 of the optical conversion plate 443, the optical conversion plate 443 flows upward while being inclined in the flow direction in the first flow portion 64A from below.
Further, the edge position D2 on the downstream side of the flow path of the green light side outlet 642A1 is from a substantially central position O in the horizontal direction of the incident side polarizing plate 442, the liquid crystal panel 441G, and the optical conversion plate 443, as shown in FIG. Are formed slightly closer to the end position S2 of the incident-side polarizing plate 442, the liquid crystal panel 441G, and the optical conversion plate 443. Therefore, the cooling air G1 and G2 flowing out through the green light side outlet 642A1 in the vicinity of the edge position D2 of the green light side outlet 642A1 are incident side polarizing plate 442 and liquid crystal panel 441G as shown in FIG. , And the optical conversion plate 443 flows from the lower side to the upper side while being inclined from the substantially central position O in the left-right direction toward the edge position D2.
Further, as shown in FIG. 15, the cooling air G1 and G2 flowing out from the substantially central position of the green light side outlet 642A1 flows from below to above while being inclined so as to straddle the substantially central position O in the left-right direction.
The green light side incident-side polarizing plate 442, the liquid crystal panel 441G, and the optical conversion plate 443 are cooled over the entire surface by such a circulation state of the cooling air G1 and G2.

  In the present embodiment described above, the first circulation portion 64A of the discharge side duct 64 constituting the cooling unit 6 has the largest amount of heat generation among the red light side, the green light side, and the blue light side of the optical device 44. After circulating the cooling air G1 and G2 in the direction along the opposing surfaces of the incident-side polarizing plate 442, the liquid crystal panel 441G, and the optical conversion plate 443 on the green light side, the cooling air G1 is passed through the green light-side outlet 642A1. , G2 are caused to flow out, so that the cooling air G1, G2 is inclined from the lower corner portion of the green light side liquid crystal panel 441G or the like toward the upper corner portion which is a diagonal position of the corner portion. It can be distributed. Therefore, the cooling air is not easily blown only to a predetermined region in the width direction of the liquid crystal panel as in the prior art, but the cooling air can be blown over the entire surface of the liquid crystal panel 441G. Cool uniformly. Further, not only the liquid crystal panel 441G but also the incident-side polarizing plate 442 and the optical conversion plate 443 on the green light side can be cooled uniformly. Therefore, the product life of the projector 1 can be extended.

  Here, the green light side outlet 642A1 has an edge position D1 formed on the upstream side of the flow path with respect to the end position S1 of the liquid crystal panel 441G and the like, and the edge position D2 is substantially the center position in the left-right direction of the liquid crystal panel 441G and the like. Since it is formed closer to the end position S2 of the liquid crystal panel 441G and the like than O, the flow of the cooling air in which the green light side outlet 642A1 circulates inside the first circulation part 64A with respect to the liquid crystal panel 441G and the like in plan view It will be arranged on the front side in the direction. Therefore, after passing through the green light side outlet 642A1, in the plane including any one of the facing surfaces of the incident side polarizing plate 442, the liquid crystal panel 441G, and the optical conversion plate 443 on the green light side, the first flow portion 64A, the cooling air flowing with an inclination in the flow direction with respect to the direction orthogonal to the flow direction of the cooling air flowing through the inside of 64A, more effectively, the incident-side polarizing plate 442 on the green light side, the liquid crystal panel 441G, and The air can be blown over the entire surface of the optical conversion plate 443, and the incident-side polarizing plate 442 on the green light side, the liquid crystal panel 441G, and the optical conversion plate 443 can be cooled more uniformly.

  Further, the red light side and the blue light side in the optical device 44 generate less heat than the green light side. For this reason, as the 2nd distribution part 64B of discharge side duct 64 which constitutes cooling unit 6, the ventilation structure different from the ventilation structure of cooling air G1 and G2 by the 1st distribution part 64A is employable. In the present embodiment, the red light side and blue light side liquid crystal panels 441R, 441B, and the like are attached to the respective light beam incident end faces of the cross dichroic prism 444 facing each other. For this reason, as the second distribution part 64B, the light flux incident side end faces of the cross dichroic prism 444 facing each other are arranged in a plane, and the red light side and blue light side incident side polarizing plates 442, the liquid crystal panel 441R, After the cooling air R and B are circulated in a direction substantially orthogonal to the opposing surfaces of 441B and the optical conversion plate 443, the red light in the optical device 44 is transmitted via the red light side outlet 642B1 and the blue light side outlet 642B2. The cooling air R and B can be blown to the side and the blue light side, respectively. As described above, since the flow paths for sending the cooling air R and B to the red light side and the blue light side in the optical device 44 can be made common, the discharge side duct 64 can be gathered compactly and the projector 1 can be downsized.

  Furthermore, the discharge side duct 64 has a first flow part 64A and a second flow part 64B having independent flow paths according to the heat generation amounts of the red light side, the green light side, and the blue light side of the optical device 44, respectively. Since it is composed of two, two sirocco fans 62 and 63 constituting the cooling unit 6 may be provided. For this reason, even if it is a case where the three liquid crystal panels 441 are comprised, each incident side polarizing plate 442, each liquid crystal panel 441, and each optical conversion board 443 can be cooled efficiently with little flow volume. Further, the number of circulation parts and cooling fans constituting the cooling unit 6 can be reduced, and the projector 1 can be reduced in size and weight.

  Furthermore, since the discharge side duct 64 is formed with rectifying ribs 641A3, 642A2, 642B3 that divert to the liquid crystal panel 441 side and the optical conversion plate 443 side, the shapes and positions of the rectifying ribs 641A3, 642A2, 642B3 are defined. By changing, it is possible to change the amount of air sent to the liquid crystal panel 441 side and the optical conversion plate 443 side. For this reason, by setting the shape and forming position of the rectifying ribs 641A3, 642A2, and 642B3 according to the heat generation amounts of the liquid crystal panel 441 side and the optical conversion plate 443, both the liquid crystal panel 441 and the optical conversion plate 443 are balanced. Can cool well.

  Here, since the translucent substrates 443A1 and 443B1 constituting the optical conversion plate 443 are made of a material having a thermal conductivity of 5 W / (m · K) or more, the polarizing films 443A2 and 443B2 and the viewing angle correction are performed. The heat generated in the film 443B3 can be effectively radiated to the translucent substrates 443A1 and 443B1, and the optical conversion plate 443 can be further efficiently cooled by using it together with the forced cooling by the cooling unit 6. Therefore, it is possible to change the shape and forming position of the rectifying ribs 641A3, 642A2 and 642B3 and reduce the flow rate diverted to the optical conversion plate 443, that is, increase the flow rate diverted to the liquid crystal panel 441. Even if the cooling unit 6 cools both the liquid crystal panel 441 and the optical conversion plate 443, the cooling efficiency of the liquid crystal panel 441 is not reduced.

  In addition, a substantially cylindrical space is formed between the liquid crystal panel 441 and the second optical conversion plate 443B by the pair of extending portions 4462 of the heat dissipation member 446. In addition, a substantially cylindrical space is also formed between the first optical conversion plate 443A and the second optical conversion plate 443B by the pair of protrusions 4472 of the holding member 447. And some cooling air which flowed out from the discharge side duct 64 distribute | circulates in each said cylindrical space. For this reason, the cooling effect of the liquid crystal panel 441 and the optical conversion plate 443 by the cooling unit 6 can be further enhanced.

  Further, the amount of heat generated on the red light side in the optical device 44 is smaller than the amount of heat generated on the other color light side. For this reason, it is not necessary to form the rectification rib which positively rectifies the cooling air R which circulates inside the second circulation part 64B toward the red light side outlet 642B1 in the discharge side duct 64. Therefore, the structure of the discharge side duct 64 can be simplified.

  And since the 1st distribution part 64A and the 2nd distribution part 64B in discharge side duct 64 are the composition where a flow path bends, for example compared with the composition where a flow path is formed in a straight line, cooling unit 6 itself Can be reduced, and the silence of the projector 1 can be ensured.

  Further, the discharge side duct 64 includes a rib 641 formed on the bottom surface portion 12 </ b> A of the lower case 12 constituting the exterior case 2 and a discharge side duct body 642. For this reason, compared with the structure which uses the discharge side duct 64 and the exterior case 2 as separate members, the number of parts can be reduced, and the projector 1 can be reduced in size, weight, and resource saving.

Although the present invention has been described with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the scope of the present invention. It is.
In the embodiment, after cooling air is circulated in the direction along the facing surfaces of the incident-side polarizing plate 442, the liquid crystal panel 441G, and the optical conversion plate 443 on the green light side, the cooling is performed via the green light side outlet 642A1. Although a cooling structure in which air is allowed to flow out and the cooling air is blown to the green light side of the optical device 44 is employed, the present invention is not limited thereto. The cooling structure may be employed on at least one of the red light side, the green light side, and the blue light side of the optical device 44. At this time, it is preferable to employ the cooling structure only on the color light side that generates the largest amount of heat among the color light sides of the optical device 44. If comprised in this way, the freedom degree of the design of the cooling structure in the other color light side except the color light side from which the emitted-heat amount becomes the largest among each color light side of the optical apparatus 44 will improve.

In the above-described embodiment, the discharge side duct 64 is configured by the two of the first circulation part 64A and the second circulation part 64B each having independent flow paths, but is not limited thereto. If the cooling structure is employed on the color light side (for example, the green light side) that generates the largest amount of heat, the first circulation part 64A and the second circulation part 64B may be shared and configured as one circulation part. Good. For example, as the circulation part, the first circulation part 64A is omitted, and the cooling air introduced into the second circulation part 64B is bent at approximately 90 °, the green light side, the blue light side, and the red light. It is formed so as to be diverted to the side. Even with such a configuration, the object of the present invention can be sufficiently achieved, and the sirocco fan 62 can be omitted, and only one sirocco fan 63 is provided. Cost reduction can be achieved.
Further, the discharge side duct 64 corresponds to each color light side of the optical device 44 in addition to the configuration having the two flow portions of the first flow portion 64A and the second flow portion 64B and the structure having the one flow portion described above. It may be composed of three distribution units.

In the embodiment, the shape of the discharge side duct 64 is not limited to the shape described in the embodiment. For example, in the above-described embodiment, the discharge-side duct 64 is set so that the flow paths of the cooling air G that flows through the first circulation portion 64A and the cooling air RB that flows through the second circulation portion 64B are in substantially opposite directions. However, it may be set so as to be in substantially the same direction.
In the above-described embodiment, the sirocco fans 62 and 63 are employed as the cooling fans. However, an axial flow fan in which the intake direction and the discharge direction of the cooling air are formed on substantially the same axis may be employed.

In the above embodiment, only the example of the projector 1 using the three liquid crystal panels 441 has been described. However, the present invention is a projector using only one liquid crystal panel, a projector using only two liquid crystal panels, or 4 The present invention can also be applied to a projector using two or more liquid crystal panels.
In the embodiment, a transmissive liquid crystal panel having a different light incident surface and light emitting surface is used. However, a reflective liquid crystal panel having the same light incident surface and light emitting surface may be used.
In the embodiment, the liquid crystal panel is used as the light modulation element. However, a light modulation element other than liquid crystal, such as a device using a micromirror, may be used. In this case, the incident side polarizing plate 442 and the optical conversion plate 443 on the light beam incident side and the light beam emission side can be omitted.
In the above embodiment, only an example of a front type projector that projects from the direction of observing the screen has been described, but the present invention is also applicable to a rear type projector that projects from the side opposite to the direction of observing the screen. Is possible.

Although the best configuration for carrying out the present invention has been disclosed in the above description, the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

  The projector of the present invention is useful as a projector used in a home theater or a presentation because the light modulation element can be cooled uniformly.

The perspective view which looked at the projector which concerns on this embodiment from the upper front side. The perspective view which looked at the projector in the said embodiment from the downward front side. The figure which shows the internal structure of the projector in the said embodiment. The figure which shows typically the optical system of the optical unit in the said embodiment. The disassembled perspective view which shows the assembly structure of the optical apparatus main body and head body in the said embodiment. The perspective view which shows the state by which the optical apparatus main body was mounted in the head body in the said embodiment. The perspective view which shows the state by which the optical apparatus main body and the projection lens were integrated by the head body in the said embodiment. The figure which shows the structure and arrangement position of the cooling unit in the said embodiment. The figure which shows the structure of the discharge side duct in the said embodiment. The figure which shows the structure of the rib in the said embodiment. The figure which shows the structure of the discharge side duct main body in the said embodiment. The figure which shows the structure of the discharge side duct main body in the said embodiment. The schematic diagram which looked at the distribution | circulation state of the cooling air in the discharge side duct in the said embodiment planarly. The figure which shows typically the cross section by the side of the blue light of the optical apparatus in the said embodiment. The figure which shows typically the cross section by the side of the green light of the optical apparatus in the said embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Exterior case (exterior housing), 6 ... Cooling unit (cooling device), 8 ... Projection lens (projection optical device), 62, 63 ... Sirocco fan ( (Cooling fan), 64... Discharge side duct, 64A... First flow section, 64B... Second flow section, 411... Light source device, 441, 441R, 441G, 441B. Light modulation element), 443 ... Optical conversion plate (optical conversion element), 443A1, 443B1 ... Translucent substrate, 443A2, 443B2 ... Polarizing film (optical conversion film), 443B3 ... Viewing angle correction Film (optical conversion film), 444... Cross dichroic prism (color synthesis optical device), 641A3, 642A2, 642B3... Rectification rib, 642A1. Light side outlet, 642B2 ··· blue light side outlet, D1, D2 ··· edge position, S1 · · · end position.

Claims (9)

A light source device, a light modulation element that modulates a light beam emitted from the light source device according to image information, a projection optical device that enlarges and projects the light beam modulated by the light modulation element, and the light modulation element And a cooling device that blows cooling air and cools the light modulation element,
The cooling device includes a cooling fan that sucks and discharges cooling air, and a discharge duct that guides the cooling air discharged by the cooling fan to a position near the light modulation element,
The discharge side duct has an inflow port through which the cooling air discharged by the cooling fan flows into the inside, and causes the cooling air to flow out in a direction substantially orthogonal to the flow direction of the cooling air flowing through the inside, to the light modulation element. It has an outflow port for blowing cooling air, and after cooling air is circulated in a direction along the light modulation surface of the light modulation element, the cooling air is blown to the light modulation element through the outflow port. Projector. The projector according to claim 1, wherein
In the outlet, the edge position on the upstream side in the flow direction of the cooling air flowing through the inside of the discharge duct is closer to the upstream side in the flow direction than the end position on the upstream side in the flow direction of the light modulation element. The projector is characterized in that the edge position on the downstream side in the distribution direction is formed on the downstream side in the distribution direction in plan view with respect to the substantially central position in the distribution direction in the light modulation element. In the projector according to claim 1 or 2,
The light modulation element comprises a plurality of;
The discharge side duct has a plurality of circulation portions that respectively guide cooling air to positions in the vicinity of the plurality of light modulation elements,
At least one of the plurality of circulation sections distributes the cooling light in a direction along the light modulation surface of the light modulation element corresponding to the circulation section, and then the light modulation via the outlet. A projector characterized in that cooling air is blown to an element. The projector according to claim 3, wherein
The plurality of light modulation elements are composed of three corresponding to each color light of red light having a red wavelength region, green light having a green wavelength region, and blue light having a blue wavelength region,
The plurality of circulation parts include a first circulation part that guides cooling air to a position near the light modulation element that generates the largest amount of heat among the three light modulation elements,
The first circulation part has the outlet in the vicinity of the light modulation element having the largest amount of heat generation, and circulates cooling air in a direction along the light modulation surface of the light modulation element having the largest amount of heat generation. Then, a cooling air is blown to the light modulation element that generates the largest amount of heat through the outlet. In the projector according to claim 3 or 4,
The plurality of light modulation elements are composed of three corresponding to each color light of red light having a red wavelength region, green light having a green wavelength region, and blue light having a blue wavelength region,
A color combining optical device that has three light beam incident side end faces for attaching the three light modulation elements, and combines the light beams modulated by the three light modulation elements;
The light modulation element corresponding to the red light and the light modulation element corresponding to the blue light are respectively attached to the light beam incident side end faces of the color synthesis optical device,
The plurality of circulation portions are provided in a first circulation portion that guides cooling air to a position near the light modulation element corresponding to the green light, a position near the light modulation element corresponding to the red light, and the blue light. A second circulation part that guides cooling air to both of the corresponding positions of the light modulation elements;
The first circulation part has the outlet in the vicinity of the light modulation element corresponding to the green light, and circulates cooling air in a direction along the light modulation surface of the light modulation element corresponding to the green light. Then, cooling air is blown to the light modulation element corresponding to the green light through the outlet.
The second circulation part has an outlet for allowing the cooling air to flow out in a direction substantially perpendicular to the direction of circulation of the cooling air that circulates in the vicinity of each light modulation element corresponding to the red light and the blue light. Then, after cooling air is circulated in a direction substantially orthogonal to the light modulation surface of each light modulation element corresponding to the red light and the blue light, it corresponds to the red light and the blue light through each outlet. A projector characterized in that cooling air is blown to each of the light modulation elements. The projector according to any one of claims 1 to 5,
An optical conversion element that opposes the light modulation element and converts the optical characteristics of the incident light beam on the optical path front stage side and / or the optical path rear stage side of the light modulation element;
The discharge-side duct blows cooling air to the light modulation element and the optical conversion element. The projector according to claim 6, wherein
The discharge side duct rectifies the cooling air that flows out through the outlet at a position that divides the light modulation element and the optical conversion element in a plane, into the light modulation element side and the optical conversion element side. A projector characterized in that a rib is formed. The projector according to claim 6 or 7,
The optical conversion element is composed of a translucent substrate and an optical conversion film that is formed on the translucent substrate and converts optical characteristics of incident light flux,
The translucent substrate is made of a material having a thermal conductivity of 5 W / (m · K) or more. The projector according to any one of claims 1 to 8,
An exterior housing that houses and arranges the light source device, the light modulation element, the projection optical device, and the cooling device;
The discharge side duct is divided into two bodies,
One of the two bodies of the discharge side duct is formed on the inner surface of the exterior casing.

Images