JP2007033800A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector where an optical conversion element can be efficiently cooled through a pedestal without any problems such as cost increase, its upsizing, and noise increase. <P>SOLUTION: An opening 642B3 formed in a duct 64B is closed by a head body 7 as a pedestal for placing a cross dichroic prism. Thus, cooling air flows under the head body 7, then, the head body 7 is cooled. The head body 7 is connected to the optical conversion element in a thermal-conductive state, and the head body 7 has a function of discharging heat from the optical conversion element and cooling the optical conversion element, then, by cooling the head body 7 with the cooling air, the optical conversion element cooling efficiency is enhanced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector.

  Conventionally, a light source device, a color separation optical system that separates a light beam emitted from the light source device into a plurality of color lights, and each color light separated by the color separation optical system is optically converted and then synthesized. A projector including an optical device that forms an image and a projection optical device that magnifies and projects an optical image formed by the optical device is known (see, for example, Patent Document 1).

  In the projector described in Patent Document 1, the optical device includes a cubic cross dichroic prism (color synthesis optical device) that synthesizes each color light. An optical conversion element such as a liquid crystal panel or a polarizing element is disposed on the color light incident end face side of the cross dichroic prism. The cross end face intersecting with each color light incident end face is made of a material having high thermal conductivity such as aluminum. The configured pedestal is fixed. When using a projector, optical conversion elements (liquid crystal panels, polarizing elements, etc.) irradiated with high-luminance luminous flux become high temperature, but the pedestal with high thermal conductivity releases the heat of the optical conversion elements and efficiently cools them. It can be carried out.

Japanese Patent Laying-Open No. 2003-262917 (page 8, FIG. 9)

By the way, in the pedestal that cools the optical conversion element by heat conduction, the cooling efficiency depends on the temperature of the pedestal itself. That is, when the temperature of the pedestal itself is low, the cooling efficiency is high, and when the temperature of the pedestal itself is high, the cooling efficiency is low. In this respect, the projector described in Patent Document 1 is not provided with means for specifically cooling the pedestal, and therefore the temperature of the pedestal is likely to rise. Therefore, there is a possibility that the optical conversion element is not sufficiently cooled via the pedestal.
If a dedicated fan is provided to cool the pedestal, the temperature of the pedestal can be lowered and the cooling efficiency of the optical conversion element can be increased. However, by adding more fans, the component cost and driving cost can be increased. Problems such as an increase in size, an increase in the size of the device, and an increase in noise.

  An object of the present invention is to provide a projector capable of efficiently cooling an optical conversion element via a pedestal without causing problems such as an increase in cost, an increase in size of an apparatus, and an increase in noise. .

  The projector of the present invention includes an optical device that optically converts a plurality of incident color lights and then combines them to form an optical image, and a projection optical device that magnifies and projects the optical image formed by the optical device. The optical device includes a plurality of optical conversion elements provided corresponding to the plurality of color lights, and a color synthesis optical device that combines the color lights optically converted by the optical conversion elements. And the color synthesizing optical device includes a plurality of incident end faces on which the respective color lights optically converted by the respective optical conversion elements are incident, and intersecting end faces intersecting with the respective incident end faces. Each of the corresponding optical conversion elements is arranged on each incident end face side of the color synthesizing optical apparatus, and heat can be transferred to at least one of the plurality of optical conversion elements on the cross end face of the color synthesizing optical apparatus. Connected The pedestal is fixed and formed to pass through a position facing the pedestal, and a duct for guiding cooling air to at least one of the plurality of optical conversion elements is provided, and the duct includes the pedestal and An opening is formed at the opposite position, and the opening is closed by the pedestal.

  In the projector of the present invention having such a configuration, the pedestal closes the opening provided in the duct, and functions as a part of the duct that guides cooling air. Here, since the cooling air guided by the duct is in direct contact with the pedestal whose opening is closed, the pedestal is cooled. Therefore, the temperature rise of the pedestal can be prevented, and the optical conversion element can be efficiently cooled via the pedestal. In addition, since the pedestal is cooled by using the ducts originally provided to guide the cooling air to the optical conversion element, there is no need to add a dedicated fan etc.・ Problems such as increased driving costs, larger equipment, and increased noise do not occur. In the present invention, an optical conversion element is a general term for elements that optically convert each color light incident on an optical device. For example, a polarization element, a light modulation element, a viewing angle correction element, a phase difference element, and the like. Is mentioned.

  In the projector according to the aspect of the invention, the optical device may include a light modulation element that modulates each color light according to image information as the optical conversion element and a color light incident side end face side of the light modulation element. An incident-side polarizing element that transmits only colored light in one polarization direction; and an output-side polarizing element that is provided on the color light output-side end face side of the light modulation element and transmits only colored light in a predetermined second polarization direction, The pedestal is preferably connected to at least one of the incident-side polarizing element and the outgoing-side polarizing element so that heat can be transferred.

  In the projector having such a configuration, the color light transmitted through the incident side polarization element is modulated by the light modulation element and incident on the emission side polarization element. Here, the incident-side polarization element and the emission-side polarization element are optical conversion elements that transmit light in their own transmissive polarization directions (first polarization direction and second polarization direction). Since such a polarizing element is irradiated with colored light, the temperature is likely to rise. In particular, in a polarizing element that absorbs light having a polarization direction different from its own transmissive polarization direction, the absorbed light changes to heat, and thus the temperature is likely to rise. According to the projector of the present invention, since the polarizing element and the pedestal are connected so that heat can be transferred, the polarizing element whose temperature is likely to rise can be efficiently cooled via the pedestal.

In the projector according to the aspect of the invention, it is preferable that a protrusion that protrudes into the duct through the opening is formed on the pedestal.
According to the projector having such a configuration, by forming the projecting portion on the pedestal, the contact area between the cooling air flowing through the duct and the pedestal can be increased, so that the pedestal can be efficiently cooled. As a result, the optical conversion element connected to the pedestal so as to be able to transfer heat can be efficiently cooled.

Next, embodiments 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 constituting the appearance 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 2, the projector 1 includes an exterior case 2, an optical unit 4, a power supply unit 5, and a cooling unit 6 that are not shown here.

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, in the front portion 11B, a card slot 17 is formed on the upper side of the exhaust port 16 so that the PC card 9 can be inserted and removed in the front-rear direction (projection direction) of the projector 1 as shown in FIG. ing. As the PC card 9, a LAN card, a memory card or the like used in a personal computer can be used, and is used for extending the function of the projector 1.

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 is disposed 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. And it is comprised so that remote control of the projector 1 can be implemented from both the front and back of the projector 1 using a remote controller.

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 approximately 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 blue light, which is color light separated by the color separation optical system 42, to a blue light liquid crystal panel described later of the optical device 44.

  At this time, in the dichroic mirror 421 of the color separation optical system 42, among the light beams emitted from the integrator illumination optical system 41, the blue light component and the green light component are transmitted, and the red light component is reflected. The red light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 418, and reaches a later-described red light liquid crystal panel. 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 green light and blue light.

Of the blue 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 blue light passes through the dichroic mirror 422, passes through the relay optical system 43, passes through the field lens 418, and reaches a liquid crystal panel for blue light to be described later.
The relay optical system 43 is configured to pass blue light of the three color lights, but is not limited thereto, and may be configured to pass red light, for example.

  The optical device 44 modulates the incident light beam according to image information to form a color image (optical 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 light liquid crystal panel 441R, green light liquid crystal panel 441G, blue light liquid crystal panel 441B as light modulation elements. The incident-side polarizing element 442 as the incident-side polarizing element and the optical conversion plate 443 as the optical converting element, which are arranged to face the light incident side and the light emitting side of the liquid crystal panel 441, respectively, and a color combining optical device A cross dichroic prism 444, a head body 7 as a pedestal, 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 and the like for holding and attaching the liquid crystal panel 441 to the cross dichroic prism 444 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 (first polarization 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.

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 corresponds to the output-side polarizing element in the present invention, has substantially the same configuration as the above-described incident-side polarizing plate 442, and has a predetermined direction (second polarization direction) in the incident light flux. Only the polarized light is transmitted, and other light beams are absorbed. 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 includes three incident end faces on which the respective color lights emitted from the optical conversion plate 443 are incident, and combines the optical images modulated for the respective color lights 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 main 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 housing 45 is a molded product made of a synthetic resin, and a predetermined illumination optical axis is set therein, and the optical components 41 to 44 described above are arranged at predetermined positions with respect to the illumination optical axis. 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 housing 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 blue light side of the optical device main body 440 is shown and the green light side and the red light side are omitted, but the same applies to the green light side and the red light side.
As shown in FIG. 5, the optical device main body 440 includes a holding frame 445, a holding member 447, and a spacer 448 in addition to the liquid crystal panel 441, the optical conversion plate 443, and the cross dichroic prism 444 described above.
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 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 spacers 448 are composed of synthetic resin rod-shaped members, and are 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.

  The holding frame 445 and the holding member 447 described above are preferably made of a material having high thermal conductivity. For example, invar and nickel-iron alloys such as 42Ni-Fe, magnesium alloys, aluminum alloys, carbon steel, stainless steel, or the like, or , A resin mixed with a carbon filler such as carbon fiber or carbon nanotube (polycarbonate, polyphenylene sulfide, liquid crystal resin, or the like). Note that the holding frame 445 and the holding member 447 may be made of the same material or different materials among the materials described above.

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 as a pedestal body.
The prism mounting portion 71 is an L-shaped horizontal portion of the head body 7 and is formed in a substantially rectangular flat plate shape in plan view, and supports the optical device body 440 including the cross dichroic prism 444 on the upper surface thereof.
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. Then, the lower surface of the cross dichroic prism 444 (intersecting end surface intersecting the three incident end surfaces) is fixed to the bulging portion 7111 so that the position of the cross dichroic prism 444 in the tilt direction relative to the head body 7 can be adjusted. Become. 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. Therefore, the heat generated by the first optical conversion plate 443A is transmitted to the prism placement portion 71 of the head body 7. For this reason, the cooling efficiency of the first optical conversion plate 443A 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).

  Further, in the head body 7, a pair of projecting portions 73 projecting downward (−Y direction in FIG. 5) perpendicular to the lower surface is formed on the lower surface of the prism placement portion 71. . The pair of projecting portions 73 are formed in the same rectangular plate shape, and project from the front side and the rear side of the lower surface of the prism mounting portion 71, respectively. At this time, the pair of protrusions 73 have normals facing in the front-rear direction (X direction in FIG. 5), and are opposed to each other along the front-rear direction. For this reason, when the prism mounting portion 71 and the pair of protruding portions 73 are viewed from the side, they are substantially U-shaped as shown in FIG. Each protrusion 73 is formed over the entire width of the prism placement portion 71 and has the same width dimension as that of the prism placement portion 71 (dimension in the Z direction in FIG. 5). A pair of protrusion part 73 which has the above structures is a part inserted in protrusion part insertion port 642B3 (refer FIG. 11) formed in the discharge side duct 64 so that it may mention later.

[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, 63 are provided with a discharge side duct 64 (corresponding to a duct in the present invention) 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 blue light side and the red light side, and the cooling air that has circulated through the first circulation part 64A and the second circulation part 64B is directed upward from the lower side of the optical device body 440. 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. . In addition, the 2nd distribution | circulation part 64B is formed so that the opposing position with the head body 7 (FIG. 5) may be passed.

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 rearward from the one end, and the distal end portion in the extending direction is bent approximately 90 ° to the left in FIG. 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 red 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. In addition, an opening portion 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.

  A long opening 642B1 is formed on the upper surface of the second duct 642B on the other end side along the flow direction of the cooling air in the second flow part 64B. The opening 642B1 can be functionally divided into three parts. That is, the opening 642B1 is formed at a position facing the head body 7 and the blue light side outflow port 642B2 through which the cooling air flows out to the blue light side of the optical device 44, and a pair of protrusions 73 (see FIG. 5) is formed by a protruding portion insertion port 642B3 (corresponding to an opening in the present invention) and a red light side outlet 642B4 through which cooling air flows out to the red light side of the optical device 44. Here, the blue light side outlet 642B2, the protrusion insertion port 642B3, and the red light side outlet 642B4 are sequentially formed from the front side to the rear side in the cooling air flow direction.

  The blue light side outlet 642B2 is disposed at a position below the blue light side of the optical device 44 in a direction (second duct) orthogonal to the opposing surfaces of the blue light side incident side polarizing plate 442, the liquid crystal panel 441B, and the optical conversion plate 443. This is a substantially rectangular opening extending in the extending direction of 642B. Here, the blue light side outlet 642B2 is formed so that the width dimension is smaller than the width dimension of the upper surface of the second duct 642B. A part of the cooling air flowing through the second circulation portion 64B flows out from the lower side to the upper side of the blue light side of the optical device 44 through the blue light side outflow port 642B2.

The red light side outlet 642B4 is formed on the upper surface on the other end side of the second duct 642B, and excludes the cooling air flowing out through the blue light side outlet 642B2 from the cooling air flowing through the second circulation part 64B. This is an opening having a trapezoidal shape in plan view that allows cooling air to flow out from the lower side toward the upper side on the red light side of the optical device 44. As shown in FIG. 11, the edge of the red light side outlet 642B4 protrudes upward and is formed so as to rectify the cooling air flowing out from the red light side outlet 642B4.
Further, in the second duct 642B, on the other end side inside the container shape, as shown in FIG. 12, the liquid crystal panel 441R on the red light side and the optical conversion plate 443 in the optical device 44 are positioned in a plane. A rectifying rib 642B5 extending in parallel to the opposing surfaces of the liquid crystal panel 441R 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 642B5 is formed so that the upper edge protrudes upward through the red light side outlet 642B4 and rectifies the cooling air flowing out from the red light side outlet 642B4. Has been.

  The protrusion insertion port 642B3 has a rectangular shape formed so as to communicate with the blue light side outlet 642B2 on the upstream side in the cooling air flow direction and the red light side outlet 642B4 on the downstream side in the cooling air flow direction. Is the opening. Here, as shown in FIG. 11, the protruding portion insertion port 642B3 is formed over the entire width of the second duct 64B, and the width dimension of the protruding portion insertion port 642B3 is larger than the width size of the blue light side outlet 642B2. Therefore, the protrusion insertion port 642B3 and the blue light side outflow port 642B2 are distinguished by the difference in the width dimension. Further, as shown in FIG. 11, the upper end edge of the protrusion insertion port 642B3 is formed below the upper end edge of the red light side outlet 642B4, so that a step 642B6 is formed on the side wall of the second duct 642B. The protrusion 642B3 and the red light outlet 642B4 are distinguished from each other by the step 642B6.

  The pair of projecting portions 73 of the head body 7 are inserted into the projecting portion insertion port 642B3. 16 and 17 schematically show a state where the protrusion 73 is inserted into the protrusion insertion port 642B3. Specifically, FIG. 16 is a cross-sectional view schematically illustrating a state in which the protruding portion 73 is inserted into the protruding portion insertion port 642B3, and FIG. 17 illustrates a state in which the protruding portion 73 is inserted into the protruding portion insertion port 642B3. It is a top view shown typically. In FIG. 16, the cross section indicated by hatching is a cross section of the second circulation portion 64 </ b> B formed by the second duct 642 </ b> B, the second rib 641 </ b> B, and the bottom surface portion 12 </ b> A of the lower case 12. In this figure, the opening formed in the upper part of the 2nd circulation part 64B is protrusion part insertion port 642B3. Further, as shown in FIG. 17, the protruding portion insertion port 642 </ b> B <b> 3 as an opening in the present invention is closed by the head body 7.

  As shown in FIGS. 16 and 17, the distance between the pair of protrusions 73 facing each other (the distance including the thickness of each protrusion 73) is the width dimension of the protrusion insertion port 642B3 (in FIG. 16). Since it is formed slightly smaller than the horizontal dimension (vertical dimension in FIG. 17), the pair of projecting portions 73 can be inserted into the projecting portion insertion port 642B3. Further, as shown in FIG. 16, the projecting dimensions of the pair of projecting parts 73 (vertical dimension in FIG. 16) are substantially the same as the height dimensions of the side walls W1, W2 of the second flow part 64B. When the protrusion 73 is inserted into the second flow part 64B through the protrusion insertion port 642B3, the tip of the protrusion 73 is near the bottom of the second flow part 64B (configured by the inner surface 12A of the lower case 12). It is supposed to be located in.

  Also, as shown in FIG. 16, when the pair of protrusions 73 are inserted into the second circulation part 64B, the pair of protrusions 73 are surrounded from both sides by the side walls W1 and W2 of the second circulation part 64B. It has become.

Further, as shown in FIG. 17, the length dimension of the head body 7 along the flow direction of the cooling air is slightly shorter than the length dimension of the protruding portion insertion port 642B3. For this reason, at least one of both ends (the right end or the left end in FIG. 17) of the protrusion insertion port 642B3 may not be blocked by the head body 7, and cooling air may flow out from the unblocked portion. There is sex. However, since both ends of the protrusion insertion port 642B3 communicate with the blue light side outlet 642B2 and the red light side outlet 642B4, respectively, the end of the protrusion insertion port 642B3 on the blue light side outlet 642B2 side. The cooling air flowing out from (the right end portion in FIG. 17) can be used for cooling the blue light side of the optical device 44 together with the cooling air flowing out from the blue light side outflow port 642B2, and the protrusion is inserted. The cooling air that flows out from the end on the red light side outflow port 642B4 side (the left end in FIG. 17) at the outlet 642B3, together with the cooling air that flows out from the red light side outflow port 642B4, It can be used for cooling.
Thus, even if the length dimension of the head body 7 is slightly shorter than the length dimension of the projecting portion insertion port 642B3, there will be no adverse effect. Good. In this way, when the head body 7 is attached to the second flow part 64B, the length dimension can be disposed with a margin, so that the attachment can be easily performed. Further, since the degree of freedom in setting the length dimensions of the head body 7 and the protruding portion insertion port 642B3 is increased, the accuracy required for design and processing can be reduced, and design and processing costs can be reduced.

  As shown in FIG. 16, in a state where the pair of projecting portions 73 are inserted into the projecting portion insertion port 642B3, the lower surface 71A of the prism placement portion 71, the inner side surfaces of the pair of projecting portions 73, and the second flow portion 64B A flow path 64B1 having a substantially rectangular shape in cross section is formed by the bottom surface (the bottom surface portion 12A of the lower case 12). Looking at this in relation to the present invention, the flow passage 64B1 closes an opening (corresponding to the protrusion insertion port 642B3 in this embodiment) formed in the duct (corresponding to the discharge-side duct 64 in this embodiment). It is comprised by the base (equivalent to the head body 7 in this embodiment) to perform, and the inner wall face of a duct. Of the cooling air that flows through the second circulation portion 64B, the cooling air that flows toward the red light outlet 642B4 without flowing out through the blue light outlet 642B2 is circulated through the flow passage 64B1. And the cooling air which distribute | circulates the inside of flow path 64B1 touches the prism mounting part 71 and the protrusion part 73 in the head body 7 which comprises a part of said flow path 64B1. Thus, in the present embodiment, the head body 7 can be cooled by the cooling air flowing through the inside of the flow passage 64B1.

(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 blue light side and the red 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 blue light side and red light side]
FIG. 14 is a diagram schematically showing a cross section of the optical device 44 on the red light side. Specifically, FIG. 14 is a diagram illustrating a cross section in a direction orthogonal to the facing surfaces of the liquid crystal panel 441R on the red light side, 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, and then bends approximately 90 ° in blue. It circulates in the direction substantially orthogonal to the opposing surfaces of the incident-side polarizing plate 442 on the light side and the red light side, the liquid crystal panels 441B and 441R, and the optical conversion plate 443. At this time, as shown in FIG. 13, the cooling air RB is divided into the cooling air B and the cooling air R by the blue light side outlet 642B2 formed in the flow path.
As shown in FIG. 13, the cooling air B flows out from the lower side to the upper side of the optical device 44 after flowing out through the blue light side outlet 642B2. Then, the incident-side polarizing plate 442 on the blue light side, the liquid crystal panel 441B, the optical conversion plate 443, and the like are cooled. The cooling structure on the blue light side of the optical device 44 is substantially the same as the cooling structure on the red light side of the optical device 44 described later (see below).

As shown in FIG. 13, the cooling air R is guided to the other end side of the second circulation part 64B. As described above, at this time, the cooling air R cools the head body 7 when flowing through the flow passage 64B1 shown in FIG. Then, as shown in FIG. 13 or FIG. 14, the cooling air R guided to the other end side through the flow path 64B1 is rectified by the rectifying rib 642B5, and the liquid crystal panel 441R side (cooling air R1) and the optical conversion plate 443 side ( The air is diverted to the cooling air R2).
As shown in FIG. 14, the cooling air R1 flows out through the red light side outlet 642B4 and then flows from the lower side to the upper side of the holding frame 445 that holds the liquid crystal panel 441R. The side end face, the light incident side end face of the liquid crystal panel 441R, and the light exit side end face of the incident side polarizing plate 442 are cooled.
As shown in FIG. 14, the cooling air R <b> 2 flows out through the red light side outlet 642 </ b> B <b> 4, and then flows upward from below the red light side holding member 447. At this time, as shown in FIG. 14, the cooling air R2 is supplied to the light beam incident side (cooling air R21) and the light beam emission side of the second optical conversion plate 443B by the second optical conversion plate 443B held by the holding member 447. The air is diverted to (cooling air R22).

The cooling air R21 is introduced into a space formed between the liquid crystal panel 441R and the second optical conversion plate 443B. Then, the cooling air R21 flows from the lower side to the upper side in the space, and the light emission side end surface of the holding frame 445, the light emission side end surface of the liquid crystal panel 441R, the holding member 447, and the second optical conversion plate 443B. Cool the light incident side end face.
The cooling air R22 is introduced into the above-described 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 R22 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 R1, R2 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 R1 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 through 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 R2 described above. The second optical conversion plate 443B is diverted to the light beam incident side and the light beam emission side, 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 first 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 R1 and R2 described above are as follows.
That is, after the cooling air R1, R2 circulates in the direction substantially orthogonal to the respective facing surfaces of the incident-side polarizing plate 442 on the red light side, the liquid crystal panel 441R, and the optical conversion plate 443 in the second circulation portion 64B, It flows out through the red light side outlet 642B4.
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 as described above, the head body 7 in which the protruding portion 73 is formed closes the protruding portion insertion port 642B3 formed in the discharge side duct 64, and one of the discharge side duct 64 that guides cooling air. It functions as a part. Since the cooling air guided by the discharge-side duct 64 is in direct contact with the head body 7 that closes the protruding portion insertion port 642B3, the head body 7 is cooled. Here, as shown in FIG. 5, the head body 7 is connected to the first optical conversion plate 443 </ b> A so as to be able to directly transfer heat, and heat generated by the first optical conversion plate 443 </ b> A is transmitted to the head body 7. However, since the head body 7 is cooled by the cooling air, the temperature rise of the head body 7 can be prevented. Therefore, the first optical conversion plate 443A can be efficiently cooled via the head body 7.

  Further, the head body 7 is cooled by using the discharge side duct 64 originally provided to guide the cooling air to the liquid crystal panel 441, the incident side polarizing plate 442, the optical conversion plate 443 and the like in the optical device 44. Therefore, it is not necessary to add a dedicated fan or the like for cooling the head body 7, and problems such as an increase in parts cost and driving cost, an increase in size of the apparatus, and an increase in noise do not occur.

  In addition, according to the present embodiment, by forming the protrusion 73 in the head body 7, the contact area between the cooling air flowing through the discharge side duct 64 and the head body 7 can be increased. 7 can be efficiently cooled. As a result, the first optical conversion plate 443A and the second optical conversion plate 443B connected to the head body 7 so as to be able to transfer heat can be efficiently cooled.

  Further, according to the present embodiment, by inserting the protrusion 73 of the head body 7 into the protrusion insertion port 642B3 of the discharge side duct 64, the head body 7 can easily form the protrusion insertion port 642B3 of the discharge side duct 64. Since it can be closed, the assembly of the device can be simplified.

  The first circulation part 64A of the discharge side duct 64 constituting the cooling unit 6 has an incident side on the green light side that generates the largest amount of heat among the red light side, the green light side, and the blue light side of the optical device 44. Since the cooling air G1 and G2 are circulated in the directions along the opposing surfaces of the polarizing plate 442, the liquid crystal panel 441G, and the optical conversion plate 443, and then the cooling air G1 and G2 are allowed to flow out through the green light side outlet 642A1. The cooling air G1 and G2 can be circulated with an inclination 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. 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 or 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 or 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.

  In addition, the blue light side and the red 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 blue light side and red light side liquid crystal panels 441B, 441R, and the like are attached to the respective light flux 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 blue light side and red light side incident side polarizing plates 442, the liquid crystal panel 441B, After the cooling air B, R is circulated in a direction substantially orthogonal to the opposing surfaces of 441R and the optical conversion plate 443, the blue light in the optical device 44 is passed through the blue light side outlet 642B2 and the red light side outlet 642B4. The cooling air B and R can be blown to the side and the red light side, respectively. As described above, since the flow paths for sending the cooling air B and R to the blue light side and the red 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.

  Further, when the blue light side and the red light side in the optical device 44 are compared, generally, the blue side has a larger amount of heat generation. In the present embodiment, the blue light side and the red light side are cooled by the cooling air flowing through the common second circulation part 64B, but it is necessary to particularly cool the blue side having a relatively large calorific value. Therefore, in the present embodiment, by providing the blue light side outlet 642B2 on the upstream side of the cooling air flow path with respect to the protrusion insertion port 642B3, cooling air having a lower temperature is sent to the blue light side of the optical device 44. Cooling is done sufficiently. That is, in the present embodiment, the cooling air flowing through the second flow part 64B cools the head body 7 inserted into the protrusion insertion port 642B3, which is more than the protrusion insertion hole 642B3. Since the temperature of the cooling air slightly rises on the rear stage side, by forming the blue light side outflow port 642B2 on the front stage side with respect to the protrusion insertion port 642B3, the cooling air before being heated by the head body 7 is optically generated. It can be sent to the blue light side of the device 44. The red light side outlet 642B4 is formed on the rear side of the protruding portion insertion port 642B3, and the cooling air heated by the head body 7 is sent to the red light side of the optical device 44. However, since the amount of heat generated on the red light side is smaller than that on the blue light side, cooling can be sufficiently performed even with cooling air having a slightly higher temperature.

  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, and 642B5 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, and 642B5 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. Therefore, by setting the shapes and positions of the rectifying ribs 641A3, 642A2, and 642B5 according to the respective heat generation amounts of the liquid crystal panel 441 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 position of the rectifying ribs 641A3, 642A2 and 642B5 to reduce the flow rate diverted to the optical conversion plate 443 side, that is, to increase the flow rate diverted to the liquid crystal panel 441 side. 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.

  Further, since the first flow part 64A and the second flow part 64B in the discharge side duct 64 have a configuration in which the flow path is bent, for example, the cooling unit 6 itself is compared with a configuration in which the flow path is formed in a straight line. Can be reduced, and the silence of the projector 1 can be ensured.

  The discharge-side duct 64 includes a rib 641 formed on the bottom surface portion 12 </ b> A of the lower case 12 that constitutes 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.

  For example, in the above-described embodiment, a pair of protrusions (protrusion 73) in the base (head body 7) is formed as shown in FIG. 16, but the configuration and number of protrusions are not limited thereto. . For example, it is good also as a protrusion part as shown in FIGS.

In FIG. 18, another protrusion 73 is formed between the pair of protrusions 73 shown in FIG. 16 so as to protrude vertically from the lower surface of the pedestal main body (prism mounting portion 71). These three protrusions 73 have the same shape. With such three protrusions 73, one flow passage 64B1 formed in FIG. 16 is divided into two flow passages 64B2 and 64B3 shown in FIG. In the example of FIG. 18, the three protrusions 73 are formed at equal intervals. Of these, the formation position of the intermediate protrusion 73 may be changed. Further, the intermediate protrusion 73 does not have to be formed in parallel with the protrusions 73 on both sides, and is in a direction intersecting with the formation direction of the protrusions 73 on both sides (a direction perpendicular to the paper surface in FIG. 18). An intermediate protrusion 73 may be formed. As described above, the amount and speed of the cooling air flowing through each of the flow passages 64B2 and 64B3 can be adjusted by appropriately changing the formation position and direction of the intermediate protrusion 73, and the efficiency according to the purpose. Cooling becomes possible.
Further, since the contact area between the cooling air and the pedestal (head body 7) can be further increased by increasing the number of protrusions 73 as compared with FIG. 16 (2 → 3), heat transfer between the pedestal and the pedestal is possible. The optical conversion element (optical conversion plate 443) that can be connected can be cooled more efficiently.

  19, of the pair of protrusions 73 shown in FIG. 16, the protrusion 73 on the rear side (left side in FIG. 16) of the pedestal (head body 7) is not provided, and the protrusion on the front side is not provided. Only the portion 73 is provided. In such a configuration, the inner side surface of one projecting portion 73, the bottom surface and side surface of the duct (second flow portion 64B) (the side surface facing the inner side surface of the projecting portion 73: the left side surface in FIG. 19), flat plate shape A flow path 64B1 is formed by the lower surface of the pedestal main body (prism mounting portion 71).

  In FIG. 20, the projecting portion 73 is configured by a pair of side surface portions 731 corresponding to the pair of projecting portions 73 shown in FIG. 16, and a bottom surface portion 732 that connects the tip portions of the pair of side surface portions 731. Yes. Here, the outer shape of the protruding portion 73 constituted by the side surface portion 731 and the bottom surface portion 732 substantially matches the inner shape of the duct 64B, and when the protruding portion 73 is inserted into the duct 64B through the opening 642B3, the protruding portion 73 fits into the duct 64B. In FIG. 20, a flow passage 64B1 having a rectangular cross section is formed by the lower surface 71A, the side surface portion 731 and the bottom surface portion 732 of the pedestal main body 71. Thus, in FIG. 20, the flow path 64B1 is formed only by the base 7. With such a configuration, the periphery of the cooling air flowing through the inside of the flow passage 64B1 is all surrounded by the pedestal 7, and the contact area between the cooling air and the pedestal 7 is maximized. The base 7 can be cooled to the maximum. The cross-sectional shape of the flow passage 64B1 is not limited to a rectangular shape, and may be a circular shape, for example.

  Moreover, in the said embodiment, although the protrusion part 73 which protrudes in a duct (2nd distribution | circulation part 64B) from the base body (prism mounting part 71) in a base (head body 7) was formed, a protrusion part is formed. You don't have to. In this case, the flat pedestal main body (prism mounting portion 71) in the pedestal (head body 7) is covered with the opening formed in the duct (corresponding to the protrusion insertion port 642B3 in the above embodiment). The opening may be closed.

  In the above embodiment, the optical conversion element of the present invention is the first optical conversion plate 443A as the output side polarization element. However, the optical conversion element may be any element as long as it optically converts a light beam. As such an optical conversion element, in addition to the output side polarizing element, for example, an incident side polarizing element (incident side polarizing plate 442 in the embodiment), a viewing angle correction element (second optical conversion plate in the embodiment). 443B), a light modulation element (the liquid crystal panel 441 in the above embodiment), a phase difference element (such as a phase difference plate), and the like, and these are connected to a pedestal (head body 7) so that heat can be transferred, You may make it cool through. Further, the pin spacer 448 is made of a heat conductive synthetic resin, optical glass, crystal, sapphire, quartz, fluorite, or a metal having a high thermal conductivity, and the liquid crystal panel 441 is interposed via the holding member 447. The base (head body 7) may be connected so as to be able to transfer heat to be cooled.

  In the above embodiment, the optical conversion element (optical conversion plate 443A) is connected to the pedestal (head body 7) so that heat can be transferred. However, the connection method in this case is limited to that disclosed in the above embodiment. I can't. In short, it is sufficient that the heat of the optical conversion element is transmitted to the pedestal regardless of whether it is direct or indirect. For example, the optical conversion element is fixed to the incident side end face of the color synthesis optical device (cross dichroic prism 444). In addition, it may be configured such that heat of the optical conversion element is transmitted to the pedestal through the color synthesizing optical device by fixing the pedestal to the intersecting end surface of the color synthesizing optical device. Moreover, you may use together the said 2 types of structure.

Moreover, in the said embodiment, protrusion part insertion port 642B3 as an opening part in this invention is the blue light side outflow port 642B2 which flows out cooling air to the blue light side of the optical apparatus 44, and the red light side of the optical apparatus 44 Since the cooling air is formed so as to communicate with the red light side outlet 642B4 that flows out the cooling air, the cooling air that flows out from the portion of the protruding portion insertion port 642B3 that is not blocked by the head body 7 flows. In this case, the pedestal formed in the duct (corresponding to the discharge-side duct 64 in the above-described embodiment) is discharged to at least one of the blue light side and the red light side. The optical conversion formed in the duct (corresponding to the head body 7 in the embodiment) (projecting portion insertion port 642B3 in the embodiment) and the duct. If and the cooling air outlet opening for the child only be formed so as to communicate, it is possible to achieve the same effect. That is, the cooling air that flows out from the portion of the opening for the pedestal that is not blocked by the pedestal can be used for cooling the optical conversion element together with the cooling air that flows out from the cooling air outflow portion for the optical conversion element. it can.
The technical scope of the present invention naturally includes a configuration in which the opening for the pedestal and the cooling air outflow portion for the optical conversion element do not communicate with each other.

  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 the red light side or 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. 64 A of 1st distribution parts and the 2nd distribution part 64B may be shared, and you may comprise by one distribution part. 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. You may form so that it may shunt to the side. According to such a configuration, the sirocco fan 62 may be omitted and only one sirocco fan 63 may be provided, and the projector 1 can be reduced in size, weight, and cost because the members are omitted.
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-described 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.

It is the perspective view which looked at the projector concerning this embodiment from the upper front side. It is the perspective view which looked at the projector in the embodiment from the lower front side. It is a figure which shows the internal structure of the projector in the said embodiment. It is a figure which shows typically the optical system of the optical unit in the said embodiment. It is a disassembled perspective view which shows the assembly structure of the optical apparatus main body and head body in the said embodiment. It is a perspective view which shows the state by which the optical apparatus main body was mounted in the head body in the said embodiment. It is a 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. It is a figure which shows the structure and arrangement position of the cooling unit in the said embodiment. It is a figure which shows the structure of the discharge side duct in the said embodiment. It is a figure which shows the structure of the rib in the said embodiment. It is a figure which shows the structure of the discharge side duct main body in the said embodiment. It is a figure which shows the structure of the discharge side duct main body in the said embodiment. It is the schematic diagram which looked at the distribution | circulation state of the cooling air in the discharge side duct in the said embodiment planarly. It is a figure which shows typically the cross section by the side of the red light of the optical apparatus in the said embodiment. It is a figure which shows typically the cross section by the side of the green light of the optical apparatus in the said embodiment. It is sectional drawing which shows typically the state which inserted the protrusion part of the head body in the said embodiment in the protrusion part insertion port. It is a top view which shows typically the state which inserted the protrusion part of the head body in the said embodiment in the protrusion part insertion port. It is sectional drawing which shows another structure of the protrusion part in a head body. It is sectional drawing which shows another structure of the protrusion part in a head body. It is sectional drawing which shows another structure of the protrusion part in a head body.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Exterior case, 4 ... Optical unit, 5 ... Power supply unit, 6 ... Cooling unit, 7 ... Head body (pedestal), 8 ... Projection lens, 9 ... PC card, 13 ... Operation panel, 16 ... Exhaust Mouth, 21, 23 ... Inlet, 41 ... Integrator illumination optical system, 42 ... Color separation optical system, 43 ... Relay optical system, 44 ... Optical device, 45 ... Housing for optical components, 61 ... Intake side duct, 62, 63 ... Sirocco fan, 64 ... discharge side duct, 64A ... first flow part, 64B ... second flow part (duct), 64B1, 64B2, 64B3 ... flow path, 71 ... prism mounting part (base body), 72 ... Lens support part 73 ... Projection part 411 ... Light source device 440 ... Optical device body 441 ... Liquid crystal panel 442 ... Incident side polarizing plate 443 ... Optical conversion plate 444 ... Cross dichroic prism 642A ... first duct, 642B ... second duct, 642B1 ... opening, 642B2 ... blue light side outlet, 642B3 ... protrusion insertion opening (opening), 642B4 ... red light side outlet.

Claims (3)

A projector comprising an optical device that optically converts a plurality of incident color lights and then combines them to form an optical image, and a projection optical device that magnifies and projects an optical image formed by the optical device,
The optical device includes a plurality of optical conversion elements provided corresponding to the plurality of color lights, and a color combining optical device that combines the color lights optically converted by the optical conversion elements.
The color synthesizing optical device includes a plurality of incident end surfaces on which the respective color lights optically converted by the respective optical conversion elements are incident, and intersecting end surfaces intersecting the respective incident end surfaces,
On each incident end face side of the color synthesis optical device, the corresponding optical conversion elements are arranged,
A pedestal connected to at least one of the plurality of optical conversion elements so as to be able to transfer heat is fixed to an intersection end surface of the color synthesis optical device,
A duct that guides cooling air to at least one of the plurality of optical conversion elements is provided so as to pass through a position facing the base.
The duct is formed with an opening at a position facing the pedestal,
The opening is closed by the pedestal;
A projector characterized by that. The projector according to claim 1, wherein
The optical device includes, as the optical conversion element, a light modulation element that modulates each color light according to image information, and a color light that is provided on a color light incident side end face side of the light modulation element and that has only a predetermined first polarization direction. An incident-side polarizing element that transmits light, and an output-side polarizing element that is provided on the color light output-side end face side of the light modulation element and transmits only color light in a predetermined second polarization direction,
The pedestal is connected to at least one of the incident side polarizing element and the outgoing side polarizing element so as to be capable of transferring heat,
A projector characterized by that. In the projector according to claim 1 or 2,
The base is formed with a protrusion that protrudes into the duct through the opening.
A projector characterized by that.

Images