JP2006343565A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector for preventing the occurrence of malfunction due to dust and the like leaking in the inside of an exterior casing by preventing light leakage outside of the exterior casing. <P>SOLUTION: Since an exhaust opening of a power source unit 6 and an exhaust opening 28 of the exterior casing 2 is connected in the form of a planar view substantially U-shape through a suction side duct 83 and an exhaust side duct 80, light leaked from the exhaust side opening of the power source unit 6 is difficult to reach the exhaust opening 28, and the dust and the like leaked to the inside 2 from the exhaust opening 28 is difficult to reach the exhaust opening of the power source unit 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector.

  2. Description of the Related Art Conventionally, there is known a projector that modulates a light beam emitted from a light source device by a light modulation device according to image information, and enlarges and projects a formed optical image by a projection optical device (see, for example, Patent Document 1).

  In the projector described in Patent Document 1, an image projection apparatus including a light source device, a light modulation device, and a projection optical device is housed inside a substantially rectangular parallelepiped outer casing. The image projection apparatus has a substantially L shape in plan view extending in the left-right direction along the longitudinal direction of the exterior housing and extending forward from the right end portion thereof. Then, inside the substantially L-shape in plan view of the image projection apparatus, a cylindrical housing having left and right ends opened, and necessary power are supplied to each component housed in the cylindrical housing. A power supply is arranged. Here, cooling air for cooling the circuit elements and the like is introduced from the opening on the right end side of the cylindrical casing of the power supply device, and the circuit elements and the like housed inside the cylindrical casing The high-temperature air warmed by the air is discharged from the opening on the left end side of the cylindrical casing to the outside of the cylindrical casing. Then, the high-temperature air discharged to the outside of the cylindrical casing is exhausted from an exhaust port formed in the exterior casing of the projector by an exhaust fan disposed at a position facing the left end opening of the cylindrical casing. It is discharged outside the exterior housing.

Japanese Patent Laying-Open No. 2005-43602 (page 12, FIG. 9, FIG. 10)

By the way, in the projector described in Patent Document 1, the right end opening, the left end opening, and the exhaust opening of the outer casing of the cylindrical casing of the power supply device are arranged substantially in a straight line.
For this reason, when the light emitted from the light source device enters from the right end side opening of the cylindrical housing of the power supply device, this light (stray light) passes through the left end side opening of the cylindrical housing as it is. Leakage tends to occur to the outside from the exhaust port of the exterior housing, and there is a risk of discomfort to those who view the image projected from the projector and those who operate the projector. In addition, when dust or the like enters the inside from the exhaust port of the exterior housing, the dust or the like easily enters the inside of the cylindrical housing from the opening on the left end side of the cylindrical housing. There is a possibility of causing a problem by contacting a circuit element or the like housed inside.

  An object of the present invention is to provide a projector that can prevent light from leaking to the outside of the exterior casing and prevent occurrence of problems due to dust or the like that has entered the interior of the exterior casing.

  The projector according to the present invention includes a light source device, a light modulation device that modulates a light beam emitted from the light source device according to image information, and a projection optical device that enlarges and projects the light beam modulated by the light modulation device. A projector comprising an image projection device and an exterior housing for housing the image projection device, wherein the image projection device has a substantially L shape, and the light source device, the light modulation device, and the projection optical device. Are arranged sequentially from one end side to the other end side of a substantially L shape in the image projection apparatus, and power is supplied to each component of the projector inside the substantially L shape of the image projection apparatus. A power supply device is disposed, and the power supply device includes a case member that houses a circuit element, and air on the side of the case member that faces the image projection device is aired inside the case member. Power exhaust opening for discharging to the case member outside is formed, characterized in that.

  In the projector having such a configuration, the light emitted from the light source device enters the inside of the case member from the opening portion for the power supply intake formed in the case member of the power supply device, and then passes from the opening portion for power supply exhaust to the outside of the case member. Even if it leaks out, since the opening for power supply exhaust is formed on the surface of the case member facing the image projection apparatus, the light leaking from the opening for power supply exhaust is supplied to the image projection apparatus or the power supply. The possibility of leaking out of the exterior casing is small because it is blocked by another member disposed between the exhaust opening and the image projection apparatus. Therefore, light leakage to the outside of the exterior housing can be prevented.

  Further, even if dust or the like has entered the exterior casing from the exhaust port of the exterior casing, the power exhaust opening for the power supply apparatus is formed on the surface of the case member that faces the image projection apparatus. Therefore, dust or the like that has entered the exterior casing is blocked by the image projection device or other members disposed between the power exhaust opening and the image projection device, and power is supplied through the power exhaust opening. The possibility of entering the inside of the case member of the device is small. Therefore, it is possible to prevent dust and the like from coming into contact with the circuit elements housed inside the case member, and it is possible to prevent the occurrence of problems.

In the projector according to the aspect of the invention, the image projection device includes a light source housing that houses at least the light source device, and the light source housing exhausts light inside the light source housing to the outside of the light source housing. A power supply air introduction portion that is formed and is connected to the power supply exhaust opening to introduce air discharged from the power supply exhaust opening, and is connected to the light source exhaust opening and the light source A duct is provided that includes a light source air introducing portion capable of introducing air discharged from an exhaust opening, and an air outlet portion for collectively deriving the air introduced from the power source air introducing portion and the light source air introducing portion. The air led out part of the duct is fed with the air led out from the air leading part toward the exhaust port formed in the exterior casing, and through the exhaust port An exhaust fan for discharging the outer Sokatamitai outside is connected, it is preferable.
According to the projector having such a configuration, the duct connected to the light source exhaust opening and the power supply exhaust opening can collectively guide the high-temperature air discharged from both the exhaust openings to the exhaust fan. And can be discharged to the outside of the outer casing by the exhaust fan. With such a duct and an exhaust fan, the high-temperature air warmed in the power supply device and the light source device can be appropriately guided to the exhaust port of the outer casing, and can be discharged to the outside of the outer casing through the exhaust port. Therefore, the cooling efficiency can be improved.
In addition, the power supply device and the light source device can be cooled even with the exhaust fan alone, and it is not necessary to provide the exhaust fan for each of the power supply device and the light source device, so the number of parts inside the exterior housing can be reduced, Miniaturization of the projector can be achieved.

In the projector according to the aspect of the invention, it is preferable that the exhaust fan and the exhaust port of the exterior housing are provided at positions shifted from each other along a direction perpendicular to the exhaust direction of the exhaust fan.
According to the projector having such a configuration, even if the light emitted from the light source device leaks from the exhaust fan through the exhaust opening of the case member of the power supply device, the exhaust fan, the exhaust port of the exterior housing, However, since it is not positioned on a straight line along the exhaust direction of the exhaust fan, the light leaked from the exhaust fan is less likely to leak outside through the exhaust port of the exterior housing. Therefore, light leakage to the outside of the exterior housing can be prevented.

In the projector of the present invention, a power intake opening for introducing cooling air into the case member is formed on a surface of the case member of the power supply device that faces the image projection device. Is preferable.
According to the projector having such a configuration, since the power supply air intake opening of the power supply device is formed on the surface of the case member facing the image projection device, the power supply air exhaust opening of the power supply device is the case member. Circuit element housed inside the case member of the power supply device, while preventing light leakage to the outside of the exterior housing It is possible to prevent dust and the like from coming into contact with each other, and to prevent occurrence of problems.

In the projector according to the aspect of the invention, the power supply device includes a power supply block that supplies power to each component of the projector, and a light source device drive block that drives the light source device, and the power supply block includes circuit elements. A power source block case member serving as the case member for housing, and the light source device driving block includes a light source device driving block case member serving as the case member for housing a circuit element, wherein the image projection device includes the power source block case member. A power block intake opening as the power intake opening for introducing cooling air into the power supply block case member is formed on the surface opposite to the surface of the light source device drive block case member. Cooling air is supplied to the light source device driving block on the surface facing the image projection device. A light source device drive block intake opening as the power supply intake opening to be introduced into the source member, and the power supply block intake opening and the light source device drive block intake opening An intake duct for introducing cooling air into the power supply block case member and the light source device drive block case member is connected via both intake openings, and the intake duct is connected to the power supply block intake opening. It is preferable that the power supply block flow path for sending cooling air and the light source apparatus drive block flow path for sending cooling air to the light source device drive block intake opening are provided.
According to the projector having such a configuration, the intake duct includes the power supply block flow path for cooling the power supply block and the light source apparatus drive block flow path for cooling the light source device drive block. Can be cooled to.
Further, the flow rate of the cooling air in the power supply block channel and the light source device drive block channel in the intake duct can be individually adjusted by adjusting the cross-sectional area of each channel. Therefore, efficient cooling can be performed, for example, it becomes possible to send a large amount of cooling air to the block that generates higher heat among the power supply block and the light source device drive block.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[1. (Appearance configuration)
1, 2, and 3 are perspective views showing the appearance of the projector 1. Specifically, FIG. 1 is a perspective view of the projector 1 as viewed from the upper front side. FIG. 2 is a perspective view of the projector 1 as viewed from the upper rear side. FIG. 3 is a perspective view of the projector 1 as seen from the lower rear side.
The projector 1 modulates a light beam emitted from a light source device by a light modulation device according to image information to form an optical image, and enlarges and projects the formed optical image on a screen (not shown) by a projection optical device. It is. As shown in FIGS. 1 to 3, the projector 1 includes a substantially rectangular parallelepiped outer casing 2 and a projection lens 3 (FIG. 1) as a projection optical device exposed from the outer casing 2.
The projection lens 3 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical lens barrel, and projects a projection optical device that enlarges and projects an optical image modulated and formed by a liquid crystal panel (described later) as a light modulation device. Is configured.

The exterior housing 2 is a case made of synthetic resin, and houses the apparatus main body of the projector 1. As shown in FIGS. 1 to 3, the exterior housing 2 includes an upper case 21 that covers the upper part of the apparatus main body, a lower case 22 that covers the lower part of the apparatus main body, and a front case that covers the front part of the apparatus main body. 23 (FIG. 1) and a rear case 24 (FIG. 2 or 3) that covers the back portion of the apparatus main body.
As shown in FIG. 1 or FIG. 2, the upper case 21 includes a top surface portion 21A, a side surface portion 21B, 21C, back part 21D (FIG. 2), and front part 21E (FIG. 1) are comprised.

As shown in FIG. 1 or 2, the top surface portion 21 </ b> A has a substantially rectangular shape in plan view, and has a convex curved surface shape that is gently curved from the substantially central portion in plan view to the front side, side surface, and back side.
As shown in FIG. 1 or FIG. 2, three openings 21 </ b> A <b> 1 are formed in the top surface portion 21 </ b> A on the right side as viewed from the front. The three openings 21A1 are one of various rotary knobs 3A for operating the projection lens 3 and performing focus adjustment, zoom adjustment, and projection position adjustment of a projected image projected on a screen (not shown). Expose the part.

Further, in the top surface portion 21A, an operation panel 25 for performing start-up / adjustment operation of the projector 1 is provided on the rear side of the opening portion 21A1 so as to extend in the left-right direction, as shown in FIG. ing. When the operation button 251 on the operation panel 25 is appropriately pressed, a tact switch mounted on a circuit board (not shown) disposed inside the operation button 251 is brought into contact with and a desired operation can be performed. In addition, an LED (Light Emitting Diode) (not shown) is attached to the circuit board so as to emit light according to a predetermined operation.
The circuit board of the operation panel 25 described above is electrically connected to a control board (not shown), and an operation signal when the operation button 251 is pressed is output to the control board.

  Further, in the top surface portion 21A, an opening portion 26 having a substantially rectangular shape in plan view is formed on the left side portion of the operation panel 25 when viewed from the front side, as shown in FIG. A lamp cover 26A having a substantially rectangular plate shape in plan view is detachably engaged.

As shown in FIG. 1 or 2, the side surface portion 21 </ b> B is substantially suspended from the long side direction edge of the top surface portion 21 </ b> A, and both end edges in the projection direction are curved to the back side and the front side so as to form a convex curved surface. It connects with back part 21D and front part 21E. Although specific illustration is omitted, the side surface portion 21C has the same shape as the side surface portion 21B.
As shown in FIGS. 1 to 3, a notch 21 </ b> B <b> 1 having a substantially U shape in plan view is formed on the front side of the side surface 21 </ b> B and 21 </ b> C from the lower end edge to the upper side.

As shown in FIG. 2, the back surface portion 21 </ b> D substantially hangs from the rear edge on the rear side in the short side of the top surface portion 21 </ b> A, has a notch 21 </ b> D <b> 1 extending from the lower edge to the upper side, and has a substantially U shape in plan view.
As shown in FIG. 1, the front surface portion 21 </ b> E is substantially suspended from the front side edge in the short side direction of the top surface portion 21 </ b> A, has a notch 21 </ b> E <b> 1 extending from the lower edge to the upper side, and has a substantially U shape in plan view.

As shown in FIGS. 1 to 3, the lower case 22 includes a bottom surface portion 22 </ b> A (FIG. 3) that forms the bottom surface, a part of the side surface, a part of the back surface, and a part of the front surface of the exterior housing 2. It includes parts 22B and 22C (not shown), a back part 22D (FIG. 2 or 3), and a front part 22E (FIG. 1 or 3).
As shown in FIG. 3, the bottom surface portion 22A is configured by a substantially rectangular flat surface. The bottom surface portion 22A includes three leg portions 22A1 that are grounded on a grounding surface such as a desk and support the projector 1 at three points, and intake ports 22A2 for introducing external cooling air into the exterior housing 2. 22A3 is formed. Here, the air inlet 22A2 is formed on the rear side of the bottom surface portion 22A and on the left side as viewed from the rear, and the air inlet 22A3 is formed on the substantially central portion on the rear side of the bottom surface portion 22A. Note that a filter for preventing dust or the like from entering the interior of the exterior housing 2 together with the cooling air is attached to each of the intake ports 22A2 and 22A3.

As shown in FIGS. 1 to 3, the side surface portion 22 </ b> B is erected upward from the long side direction edge of the bottom surface portion 22 </ b> A, and both edges in the projection direction are curved to the back side and the front side so as to form a convex curved surface. Then, it is connected to the back surface portion 22D and the front surface portion 22E. Although not specifically illustrated, the side surface portion 22C has the same shape as the side surface portion 22B.
As shown in FIGS. 1 to 3, a cutout 22 </ b> B <b> 1 is formed on the front side of the side portions 22 </ b> B and 22 </ b> C from the upper end edge to the lower side, as shown in FIGS. 1 to 3. When the upper case 21 and the lower case 22 are assembled, the cutout 21B1 and the cutout 22B1 are connected to each other so that the air in the outer casing 2 is discharged to the outside. 28 is formed. As shown in FIGS. 1 to 3, the exhaust port 28 is provided with an exhaust fan (described later) that discharges high-temperature air that is disposed inside the exterior housing 2 and is heated inside the exterior housing 2. A louver 81 that rectifies the discharged hot air in a predetermined direction is attached.

As shown in FIG. 2 or 3, the back surface portion 22D is erected upward from the rear edge in the short side direction of the bottom surface portion 22A, and a notch 22D1 is formed from the upper edge to the lower side. It has a letter shape. The rear case 24 is supported and fixed at the U-shaped inner portion of the back surface portion 21 </ b> D in the upper case 21 and the U-shaped inner portion of the rear surface portion 22 </ b> D of the lower case 22.
As shown in FIG. 2 or 3, the back surface portion 22D is formed on the lower side and on the right side when viewed from the rear side, and is recessed on the inside of the exterior housing 2 and has a rectangular opening 22D2 on the bottom portion. Has been. An internal inlet connector (not shown) is exposed through the opening 22D2, and external power can be supplied to the apparatus main body of the projector 1.

  As shown in FIG. 1 or FIG. 3, the front surface portion 22E is erected upward from the front side edge in the short side direction of the bottom surface portion 22A, and a notch 22E1 is formed from the upper edge to the lower side. Has a shape. The front case 23 is supported and fixed at the U-shaped inner portion of the front surface portion 21E in the upper case 21 and the U-shaped inner portion of the front surface portion 22E in the lower case 22.

As shown in FIG. 1, the front case 23 has a substantially oval shape extending in the left-right direction and is connected to the upper case 21 and the lower case 22 so as to close the openings formed in the front portions 21E and 22E. To do.
As shown in FIG. 1, in the front case 23, the right side portion as viewed from the front is formed with a recess inward of the exterior housing 2 and a substantially circular opening 231 in the bottom portion. The opening 231 exposes the tip portion of the projection lens 3.
Further, in the front case 23, as shown in FIG. 1, a remote control light receiving window 232 is formed at a substantially central portion in the longitudinal direction. A remote control light receiving module (not shown) for receiving an operation signal from a remote controller (not shown) is disposed inside the remote control light receiving window 232.
The remote controller is provided with the same start switch, adjustment switch and the like provided on the operation panel 25 described above. When the remote controller is operated, an infrared signal corresponding to this operation is output from the remote controller. The infrared signal is received by the remote control light receiving module through the remote control light receiving window 232 and processed by a control board (not shown).

As shown in FIG. 2 or FIG. 3, the rear case 24 has a substantially elliptical shape extending in the left-right direction, and is connected to the upper case 21 and the lower case 22 to form openings formed in the rear portions 21D and 22D. Block the part.
As shown in FIG. 2 or FIG. 3, the rear case 24 has a rectangular concave portion 241 that is recessed inward in the plan view, as shown in FIG. 2 or 3.
As shown in FIG. 2 or FIG. 3, a plurality of holes 242 are formed in the concave portion 241, and image signals, audio signals, and the like from external electronic devices are input through the plurality of holes 242. A plurality of connection terminals 243 are exposed to the outside. An interface board (not shown) for processing a signal input from the connection terminal 243 is disposed inside the rear case 24.
The interface board is electrically connected to a control board (not shown), and a signal processed by the interface board is output to the control board.

In the rear case 24, a speaker hole 244 for outputting sound to the outside of the projector 1 is formed in the right side portion of the recess 241 when viewed from the rear side, as shown in FIG. Inside the speaker hole 244, a speaker 29 that is controlled by a control board (not shown) and outputs a predetermined sound is disposed.
Further, in the rear case 24, the upper left portion of the speaker hole 244 when viewed from the rear side communicates with the inside of the exterior housing 2 as shown in FIG. 2 or FIG. An operation hole 245 for releasing the engaged state is formed.

[2. Internal configuration)
FIG. 4 is a perspective view showing the internal configuration of the projector 1. Specifically, the upper case 21 of the exterior housing 2 is removed. FIG. 5 is a perspective view showing a state in which the front case 23, the rear case 24, and the control board 5 of the exterior housing 2 are removed from the state of FIG. FIG. 6 is a perspective view showing a state where the projection lens 3 and the image forming unit 4 are removed from the state of FIG.
An apparatus main body of the projector 1 is accommodated in the exterior casing 2, and the apparatus main body is disposed above the image forming unit 4 and an image projecting apparatus constituted by the projection lens 3 and the image forming unit 4. The control board 5 (FIG. 4), the power supply unit 6 as a power supply device, the cooling unit 7, and the exhaust unit 8 are provided.

[2-1. Configuration of image projection apparatus)
FIG. 7 is a plan view schematically showing the image projection apparatus. As shown in this figure, the image projection apparatus includes an image forming unit 4 extending in the left-right direction along the longitudinal direction of the exterior casing 2 and a projection lens 3 extending forward from the right end of the image forming unit 4. It has a substantially L shape in plan view.
The image forming unit 4 forms image light according to image information under the control of the control board 5. As shown in FIG. 7, the image forming unit 4 includes a light source device 41, a uniform illumination optical system 42, a color separation optical system 43, a relay optical system 44, an optical device 45, and these optical components 42 to 45. And an optical component housing 46 for housing the inside.
Here, the light source device 41, the uniform illumination optical system 42, the color separation optical system 43, the relay optical system 44, the optical device 45, and the projection from one end side to the other end side of the substantially L-shaped plan view of the image projection device. Lenses 3 are sequentially arranged.

The light source device 41 is turned on under the control of the control board 5 and emits parallel light toward the uniform illumination optical system 42. As shown in FIG. 7, the light source device 41 includes an arc tube 411 that performs discharge light emission between a pair of electrodes, an elliptic reflector 412 that reflects radiated light emitted from the arc tube 411, and an elliptic reflector 412. A collimating concave lens 413 that converts the reflected light beam into parallel light and a lamp housing 414 as a light source housing that houses and arranges these members 411 to 413 are configured.
As shown in FIG. 7, the arc tube 411 includes a light emitting part 4111 that is located at the center and swells in a substantially spherical shape, and a pair of sealing parts 4112 extending on both sides of the light emitting part 4111.
A substantially spherical discharge space is formed in the light emitting portion 4111, and a pair of electrodes (not shown), mercury, a rare gas, and a small amount of halogen are enclosed in the discharge space.
A metal foil (not shown) made of molybdenum that is electrically connected to the pair of electrodes is inserted into the pair of sealing portions 4112 and sealed with a glass material or the like. A lead wire (not shown) as an electrode lead wire is further connected to each metal foil, and the lead wire extends to the outside of the arc tube 411. Then, when a voltage is applied to the lead wire, a potential difference is generated between the pair of electrodes via the metal foil, causing discharge, and the inside of the light emitting portion 4111 emits light.
As shown in FIG. 7, the elliptical reflector 412 includes a cylindrical neck portion 4121 through which one sealing portion 4112 on the proximal end side of the arc tube 411 is inserted to support the arc tube 411, and the neck portion 4121. This is an integrally molded product made of glass having translucency, which has a concave curved reflecting portion 4122 that expands.
In the light source device 41 of the present embodiment, the reflected light is collimated by the combination of the elliptical reflector 412 and the collimating concave lens 413, but the reflected light may be collimated using a parabolic reflector.

The uniform illumination optical system 42 is an optical system for illuminating a light beam emitted from the light source device 41 substantially uniformly on an image forming area of a liquid crystal panel, which will be described later, constituting the optical device 45. As shown in FIG. 7, the uniform illumination optical system 42 includes a first lens array 421, a second lens array 422, a polarization conversion element 423, and a superimposing lens 424.
The first lens array 421 has a configuration in which small lenses having a substantially rectangular outline when viewed from the optical axis direction are arranged in a matrix. Each small lens splits the light beam emitted from the light source device 41 into a plurality of partial light beams.
The second lens array 422 has substantially the same configuration as the first lens array 421, and has a configuration in which small lenses are arranged in a matrix. The second lens array 422 has a function of forming an image of each small lens of the first lens array 421 on a liquid crystal panel (to be described later) of the optical device 45 together with the superimposing lens 424.

The polarization conversion element 423 is disposed between the second lens array 422 and the superimposing lens 424, and converts light from the second lens array 422 into substantially one type of polarized light.
Specifically, each partial light converted into approximately one type of polarized light by the polarization conversion element 423 is finally superimposed on a liquid crystal panel (described later) of the optical device 45 by the superimposing lens 424. 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 from the light source device 41 that emits randomly polarized light cannot be used. For this reason, by using the polarization conversion element 423, the light emitted from the light source device 41 is converted into substantially one type of polarized light, and the light use efficiency in the optical device 45 is increased.

As shown in FIG. 7, the color separation optical system 43 includes two dichroic mirrors 431 and 432 and a reflection mirror 433, and a plurality of partial light beams emitted from the uniform illumination optical system 42 by the dichroic mirrors 431 and 432. Has a function of separating the light into three color lights of red, green, and blue.
As shown in FIG. 7, the relay optical system 44 includes an incident side lens 441, a relay lens 443, and reflection mirrors 442 and 444, and red light that is separated by the color separation optical system 43, which will be described later in the optical device 45. It has the function of leading to the liquid crystal panel for light.

  At this time, the dichroic mirror 431 of the color separation optical system 43 reflects the blue light component of the light beam emitted from the uniform illumination optical system 42 and transmits the red light component and the green light component. The blue light reflected by the dichroic mirror 431 is reflected by the reflection mirror 433, passes through the field lens 425, and reaches a later-described blue light liquid crystal panel of the optical device 45. The field lens 425 converts each partial light beam emitted from the second lens array 422 into a light beam parallel to the central axis (principal ray). The same applies to the field lens 425 provided on the light incident side of the other liquid crystal panel for green light and red light.

  Of the red light and green light transmitted through the dichroic mirror 431, the green light is reflected by the dichroic mirror 432, passes through the field lens 425, and reaches a later-described green light liquid crystal panel of the optical device 45. On the other hand, the red light passes through the dichroic mirror 432, passes through the relay optical system 44, passes through the field lens 425, and reaches a later-described red light liquid crystal panel of the optical device 45. Note that the relay optical system 44 is used for red light because the optical path length of red light is longer than the optical path lengths of the other color lights, thereby preventing a reduction in light utilization efficiency due to light divergence or the like. It is to do. That is, this is to transmit the partial light beam incident on the incident side lens 441 to the field lens 425 as it is.

As shown in FIG. 7, the optical device 45 includes three liquid crystal panels 451 (red liquid crystal panel 451R, green light liquid crystal panel 451G, blue light liquid crystal panel 451B as light modulation devices. And the incident-side polarizing plate 452 and the emitting-side polarizing plate 453 disposed on the light-incident side and the light-emitting side of the liquid crystal panel 451, respectively, and a cross dichroic prism 454.
Although not specifically shown, the liquid crystal panel 451 has a configuration in which a liquid crystal as an electro-optical material is hermetically sealed between a pair of transparent glass substrates, and according to a drive signal output from the control board, The alignment state of the liquid crystal is controlled, and the polarization axis of the polarized light beam emitted from the incident side polarizing plate 452 is changed.
The incident-side polarizing plate 452 receives the respective color lights whose polarization directions are aligned in substantially one direction by the polarization conversion element 423, and is substantially the same as the polarization axis of the light beams aligned by the polarization conversion element 423 among the incident light beams. Only polarized light in the direction is transmitted, and other light beams are absorbed. The incident-side polarizing plate 452 has a configuration in which a polarizing film is pasted on a translucent substrate such as sapphire glass or quartz.
The exit-side polarizing plate 453 has substantially the same configuration as the incident-side polarizing plate 452, and only the light beam having a polarization axis orthogonal to the transmission axis of the light beam in the incident-side polarizing plate 452 among the light beams emitted from the liquid crystal panel 451. It transmits light and absorbs other light fluxes.
The liquid crystal panel 451, the incident-side polarizing plate 452, and the emission-side polarizing plate 453 constitute a light modulation element, and the light modulation element modulates the light beam according to image information to form an optical image. .

  The cross dichroic prism 454 is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from the light modulation element. The cross dichroic prism 454 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and two dielectric multilayer films are formed at the interface where the right-angle prisms are bonded together. These dielectric multilayer films transmit the color light emitted from the liquid crystal panel 451G and pass through the emission side polarizing plate 453, and reflect the color light emitted from the liquid crystal panels 451R and 451B and passing through the emission side polarizing plate 453. In this manner, the color lights modulated by the light modulation elements are combined to form a color image.

The optical component casing 46 is a molded product made of synthetic resin. As shown in FIG. 7, the light beam emitted from the light source device 41 is introduced, and the illumination optical axis A of the light beam introduced inside is set. The optical components 42 to 45 described above are arranged at predetermined positions with respect to the illumination optical axis A.
In the optical component casing 46, a projection lens installation portion 46 </ b> A for installing the projection lens 3 at a predetermined position with respect to the image forming unit 4 is formed on the front part of the side surface. The projection lens 3 installed in the projection lens installation unit 46 </ b> A enlarges and projects the color image formed by the image forming unit 4.
Further, in the optical component casing 46, three holes (not shown) are formed on the bottom surface corresponding to the positions of the liquid crystal panels 451 of the optical device 45. Then, the exterior casing is connected via the intake port 22A2 by the sirocco fan 71 (FIG. 6) disposed in the exterior casing 2 with the intake surface facing the intake port 22A2 (FIG. 3) formed in the lower case 22. 2 Cooling air taken into the inside from the outside is guided to the lower part of the optical device 45 by the duct 72 (FIG. 6), introduced into the optical component casing 46 through the three holes, and each liquid crystal panel 451. Cool down.
A notch (not shown) is formed on the upper surface of the optical component housing 46 in correspondence with the position where the optical device 45 is disposed, and the cooling air introduced into the optical component housing 46 is exposed to the outside. It is configured to allow outflow.

[2-2. Configuration of control board 5]
As shown in FIG. 4, the control board 5 is disposed above the optical component casing 46 described above. The control board 5 is configured as a circuit board on which an arithmetic processing device such as a CPU (Central Processing Unit) is mounted, and controls the entire projector 1. The control board 5 drives and controls the liquid crystal panels 451R, 451G, and 451B based on signals output from the interface board. The liquid crystal panels 451R, 451G, and 451B perform optical modulation to form an optical image. The control board 5 receives operation signals output from the circuit board of the operation panel 25 and the remote control light receiving module (not shown), and appropriately controls components of the projector 1 based on the operation signals. Outputs a command.

[2-3. Configuration of power supply unit 6]
The power supply unit 6 is a device that supplies necessary power to the light source device 41, the control board 5, and the like. Inside the image projection device that is configured by the projection lens 3 and the image forming unit 4, a substantially L-shaped inside in a plan view, It arrange | positions along the longitudinal direction of the front case 23 (FIG. 1) of the exterior housing | casing 2 (refer FIG. 5).
FIG. 8 is a perspective view of the power supply unit 6 as viewed from the rear side of the projector 1. The power supply unit 6 includes a power supply block 61 and a lamp driving block 62 as a light source device driving block that are integrally stacked along a direction perpendicular to the bottom surface of the exterior housing 2.

  The power supply block 61 includes a power supply block case 611 as a power supply block case member having a substantially rectangular parallelepiped shape. A circuit element (not shown) is accommodated in the power supply block case 611. This circuit element supplies the power supplied from the outside through the power cable connected to the inlet connector to the circuit element (described later) of the lamp driving block 62, the control board 5, and the like. This circuit element is configured by mounting, on one side of a circuit board, a transformer that converts an input alternating current into a low-voltage direct current, a conversion circuit that converts an output from the transformer into a predetermined voltage, and the like. Also, the power supply block case 611 is supplied with intake air openings 611A as power supply block intake openings for introducing cooling air into the power supply block case 611, and hot air heated inside the power supply block case 611 is supplied with power. An exhaust opening 611B is formed as a power supply block exhaust opening for discharging to the outside of the block case 611. Here, each of the intake opening 611A and the exhaust opening 611B is a rear surface of the power supply block case 611, that is, the side facing the image forming unit 4 in the image projection apparatus having a substantially L shape in plan view. (See FIG. 5). Here, the intake opening 611A is formed near the bent portion in the substantially L-shaped plan view of the image projection apparatus, and the exhaust opening 611B is one end of the substantially L-shaped plan view of the image projection apparatus. It is formed closer to the end on the side where the light source device 41 (FIG. 7) is disposed.

The lamp driving block 62 includes a lamp driving block case 621 as a light source device driving block case member having a substantially rectangular parallelepiped shape. A circuit element (not shown) is accommodated in the lamp drive block case 621. This circuit element is a conversion circuit for supplying electric power to the light source device 41 with a stable voltage. Commercial AC current input from the circuit element of the power supply block 61 is rectified by the circuit element in the lamp driving block 62. , Converted into a direct current or an alternating rectangular wave current and supplied to the light source device 41. In addition, the lamp drive block case 621 is warmed inside the lamp drive block case 621 by an intake opening 621A as a light source device drive block intake opening for introducing cooling air into the lamp drive block case 621. An exhaust opening 621B is formed as an exhaust opening for the light source device drive block for discharging the high temperature air to the outside of the lamp drive block case 621. Here, the intake opening 621A and the exhaust opening 621B are both opposed to the rear surface of the lamp drive block case 621, that is, the image forming unit 4 in the image projection apparatus having a substantially L shape in plan view. It is formed on the side surface (see FIG. 5). Here, the intake opening 621A is formed near the bent portion in the substantially L-shaped plan view of the image projection apparatus, and the exhaust opening 621B is one end portion in the substantially L-shaped plan view of the image projection apparatus. It is formed closer to the end on the side where the light source device 41 (FIG. 7) is disposed.
The intake opening 621A is formed right above the intake opening 611A of the power supply block 61, and the exhaust opening 621B is formed right above the exhaust opening 611B of the power supply block 61. Has been.

[2-4. Configuration of cooling unit 7]
The cooling unit 7 is a unit that takes in cooling air for cooling each heat generating element in the projector 1 from the outside of the exterior housing 2 and sends it to each heat generating element. Here, the main heat generating elements are the liquid crystal panels 451R, 451G, 451B (FIG. 7), the light source device 41 (FIG. 7), the circuit elements of the power supply block 61 (FIG. 8), etc., and the lamp driving block 62 (FIG. 8). Circuit elements and the like.
As shown in FIG. 6, the cooling unit 7 includes a sirocco fan 71 and a duct 72 for sending cooling air to each liquid crystal panel 451, and a sirocco fan 73 for sending cooling air to the power supply block 61 and the lamp driving block 62. And an intake duct 74 and a sirocco fan 75 for sending cooling air to the arc tube 411 (FIG. 7) of the light source device 41.

As described above, the sirocco fan 71 and the duct 72 take cooling air into the exterior housing 2 from the air inlet 22A2 (FIG. 3) formed in the lower case 22 and send it to each liquid crystal panel 451.
As shown in FIG. 5, the sirocco fan 73 is disposed opposite to the intake openings 611 </ b> A and 621 </ b> A (FIG. 8) in the power supply unit 6 with the image forming unit 4 constituting the image projection apparatus interposed therebetween. . The sirocco fan 73 is disposed with the intake surface facing the intake port 22A3 (FIG. 3) formed in the lower case 22, and the discharge surface is directed to the intake openings 611A and 621A of the power supply unit 6. Are arranged. The sirocco fan 73 sucks cooling air from the outside of the exterior housing 2 through the air inlet 22A3 and discharges the cooling air toward the air intake openings 611A and 621A of the power supply unit 6. As shown in FIG. 6, the intake duct 74 is formed along the discharge direction of the sirocco fan 73, connects the sirocco fan 73 and the intake openings 611 </ b> A and 621 </ b> A of the power supply unit 6, and discharges from the sirocco fan 73. The cooled air thus introduced is introduced into the power supply block case 611 and the lamp drive block case 621 through the intake openings 611A and 621A. Here, the intake duct 74 is formed so as to pass through a space below the image forming unit 4 constituting the image projection apparatus.

  FIG. 9 is a perspective view showing the intake duct 74, and FIG. 10 is an exploded perspective view showing the intake duct 74. In these drawings, the direction in which the cooling air flows from the sirocco fan 73 is indicated by arrows. As shown in these drawings, the intake duct 74 includes a left channel member 74L that forms the left part of the cooling air channel and a right channel member 74R that forms the right part of the cooling air channel. It is configured. By engaging a plurality of pairs of engaging pieces 74L1 and 74R1 provided on the left channel member 74L and the right channel member 74R, the left channel member 74L and the right channel member 74R are integrated with the intake duct. 74 (FIG. 9).

  As shown in FIG. 10, the left flow path member 74L is formed with a partition portion 74L2 that is formed along the flow path of the cooling air and partitions the flow path up and down. Here, the partition portion 74L2 starts from a deeper position along the flow path than the cooling air inlet portion 74L3, and ends at the same position along the flow path as the cooling air outlet portion 74L4. In addition, although illustration is abbreviate | omitted, the partition part 74R2 similar to the left channel member 74L is formed also in the right channel member 74R. Then, when the intake duct 74 is assembled by engaging a plurality of pairs of engagement pieces 74L1 and 74R1, the partition portion 74L2 of the left flow channel member 74L and the partition portion 74R2 of the right flow channel member 74R are not in contact with each other. The partition which contacts and partitions the inside of the intake duct 74 up and down is formed. As a result, two cooling air flow paths are formed in the intake duct 74. The partition portion 74L2 starts from a position behind the cooling air inlet portion 74L3 along the flow path (the same applies to the partition portion 74R2), and thus is formed inside the intake duct 74 by the partition portions 74L2 and 74R2. The partition starts from the back position along the flow path from the cooling air inlet (the same position as 74L3). Therefore, the flow path of the cooling air formed inside the intake duct 74 is initially one as shown in FIG. 9, and as it advances along the flow path, it is moved up and down by the partitions formed by the partition portions 74L2 and 74R2. It is branched into two and sent to the power supply unit 6 as it is.

As shown in FIG. 11 (exploded perspective view), the cooling air outlet 744 of the intake duct 74 is connected to the intake openings 611 A and 621 A of the power supply unit 6. At this time, the outlet part of the flow path (the power supply block flow path in the present invention) on the lower side of the partition inside the intake duct 74 is connected to the intake opening 611A of the power supply block 61, and the circuit element inside the power supply block case 611 is connected. In addition, the outlet of the flow path on the upper side of the partition (the light source device drive block flow path in the present invention) is connected to the intake opening 621A of the lamp drive block 62 to connect the lamp drive block case 621. Cooling air is sent to internal circuit elements.
Each flow path formed in the intake duct 74 has a cross-sectional area that is set according to the amount of heat generated by the power supply block 61 and the lamp drive block 62. Specifically, the cross-sectional area of the flow path for the power supply block 61 that generates a large amount of heat is made larger than the cross-sectional area of the flow path for the lamp drive block 62 that generates a small amount of heat, and more cooling air is supplied to the power supply block. It is introduced into the case 611. The cross-sectional area of the flow path can be set by the position of the partition formed inside the intake duct 74.

  As shown in FIG. 5, the sirocco fan 75 is stacked above the sirocco fan 73 for cooling the power supply unit 6. Here, between the sirocco fan 75 and the sirocco fan 73, a fan fixing member 76 that fixes the two sirocco fans to each other is disposed. Are spaced apart from each other by a predetermined distance along a direction substantially perpendicular to the bottom surface. Thus, a space is generated between the two sirocco fans, and the sirocco fan 75 sucks cooling air for cooling the arc tube 411 (FIG. 7) of the light source device 41 by the intake surface facing the space.

  As shown in FIG. 5, the discharge surface of the sirocco fan 75 faces the lamp housing 414 (FIG. 7) that houses the arc tube 411. The lamp housing 414 is formed with an opening 4141 for introducing the cooling air discharged from the sirocco fan 75 into the interior. Then, the cooling air introduced into the lamp housing 414 through the opening 4141 is sent to the arc tube 411, and the arc tube 411 is cooled.

[2-5. Configuration of exhaust unit 8]
FIG. 12 is a perspective view showing the exhaust unit 8 together with the power supply unit 6, the sirocco fan 73, and the intake duct 74. 13 is a perspective view of only the exhaust unit 8 as seen from a direction different from that in FIG. The exhaust unit 8 discharges the high-temperature air heated inside the exterior casing 2, particularly the high-temperature air heated by the light source device 41 and the high-temperature air heated by the power supply unit 6 to the outside of the exterior casing 2. Unit. The exhaust unit 8 includes an exhaust duct 80 having a louver 81, an exhaust fan 82 as an axial fan, and an intake duct 83 as a duct in the present invention.

  The intake side duct 83 is a molded product made of synthetic resin or the like by injection molding or the like, and is interposed between the light source device 41 and the exhaust fan 82 and between the power supply unit 6 and the exhaust fan 82, The high temperature air warmed by the device 41 is guided to the exhaust fan 82, and the high temperature air warmed by the power supply unit 6 is guided to the exhaust fan 82. In the intake side duct 83, three openings 831 (FIG. 12), 832 (FIG. 12), and 833 (FIG. 13) for introducing high-temperature air from each part are formed.

High-temperature air discharged from the sirocco fan 75 (FIG. 5) and heated by the arc tube 411 inside the lamp housing 414 (FIG. 5) of the light source device 41 is provided in the opening 831 (FIG. 12) serving as the light source air introduction unit. Is introduced. The high-temperature air heated by the arc tube 411 is discharged from an opening (not shown) serving as a light source exhaust opening formed at a position facing the opening 831 in the lamp housing 414 and is discharged to the opening 831. be introduced.
FIG. 14 schematically shows a specific air flow F1. First, the cooling air discharged from the sirocco fan 75 is introduced into the lamp housing 414 through the opening 4141. This cooling air is bent by approximately 90 ° in the traveling direction and travels inside the lamp housing 414 substantially perpendicularly to the longitudinal direction of the image forming unit 4 (light emission direction of the light source device 41). The cooling air cools the arc tube 411 (not shown in FIG. 14) arranged on the traveling trajectory and is warmed to become high-temperature air. The high-temperature air travels substantially straight after being heated by the arc tube 411, and is discharged from the opening (not shown) formed on the side surface of the lamp housing 414 opposite to the opening 4141. . The discharged high temperature air is introduced into the intake side duct 83 from the opening 831. This hot air is attracted by the exhaust fan 82.

The opening 832 (FIG. 12) serving as the light source air introduction portion is sucked by the exhaust fan 82 and is heated by the elliptic reflector 412 (FIG. 7) inside the lamp housing 414 (FIG. 5) of the light source device 41. Is introduced.
14 and 15 schematically show specific air flows F21 and F22 involved in cooling the elliptical reflector 412. FIG. FIG. 15 is a cross-sectional view of the intake-side duct 83 and shows a state in which high-temperature air is introduced into the intake-side duct 83 through the opening 832. As shown in FIG. 15, the opening portion 832 is a hole formed in a step portion 835 formed to protrude substantially perpendicularly to the side wall portion 834 at the lower end portion of the side wall portion 834 of the intake side duct 83. It is configured.

In the air flow F21, as shown in FIG. 14, the cooling air outside the lamp housing 414 is sucked by the exhaust fan 82 and passes through a pair of openings 4142 formed on the upper surface of the lamp housing 414. To be introduced. Then, the cooling air flows from the upper side to the lower side along the convex back surface of the elliptical reflector 412 (FIG. 7) in the lamp housing 414 (see FIG. 15), cools the elliptical reflector 412, and passes through the opening 832. It is introduced into the intake side duct 83.
In the air flow F22, as shown in FIG. 14, the cooling air outside the lamp housing 414 is sucked by the exhaust fan 82 and introduced into the lamp housing 414 through an opening 4143 formed on the side surface of the lamp housing 414. The Then, the cooling air flows in the left-right direction along the convex back surface of the elliptical reflector 412 (FIG. 7) in the lamp housing 414 (see FIG. 15), cools the elliptical reflector 412, and passes through the opening 832 to the intake side duct. 83 is introduced inside.

High-temperature air discharged from the sirocco fan 73 (FIG. 14) and warmed by the power supply unit 6 is introduced into the opening 833 (FIG. 13) serving as a power supply air introduction unit.
FIG. 14 schematically shows a specific air flow F3. First, the cooling air discharged from the sirocco fan 73 is introduced into the power supply block case 611 and the lamp drive block case 621 from the intake openings 611A and 621A (FIG. 8) via the intake duct 74. The cooling air is bent by approximately 90 ° in the traveling direction and travels along the longitudinal direction of the power supply unit 6 to cool the circuit elements and the like housed in the power supply block case 611 and the lamp drive block case 621. Then, the traveling direction is bent again by approximately 90 ° and discharged from the exhaust openings 611B and 621B (FIG. 8) to the outside of the power supply block case 611 and the lamp drive block case 621. The opening 833 is formed at a position facing the exhaust openings 611B and 621B, and the high-temperature air exhausted from the exhaust openings 611B and 621B is introduced into the intake side duct 83 from the opening 833. . The hot air is attracted by the exhaust fan 82.

  As described above, the intake-side duct 83 includes the high-temperature air (flow F1) from the arc tube 411 in the light source device 41, the high-temperature air (flows F21 and F22) from the elliptic reflector 412 in the light source device 41, and the power supply unit 6. The high temperature air (flow F <b> 3) is collected and led to the exhaust fan 82 connected to the air outlet 836.

The exhaust fan 82 is an axial fan in which the high-temperature air suction direction and the discharge direction are substantially the same, and sucks high-temperature air guided from the intake-side duct 83 and discharges it toward the exhaust-side duct 80.
The exhaust side duct 80 is formed in a cylindrical shape through which high temperature air flows, and a louver 81 is provided on the high temperature air discharge side. As shown in FIG. 14 and the like, the louver 81 includes a plurality of blade plates 811 arranged in parallel, and the plurality of blade plates 811 have a shape extending in the left-right direction.
FIG. 14 shows a flow F4 in which high-temperature air discharged from the exhaust fan 82 is discharged to the outside of the exterior housing 2 through the exhaust side duct 80.

  FIG. 16 is a cross-sectional view of the exhaust fan 82 and the exhaust side duct 80, and shows the flow F4 of high-temperature air that is discharged. As shown in this figure, the exhaust duct 80 is formed along a direction intersecting the exhaust direction of the exhaust fan 82, and the exhaust fan 82, the exhaust port 28 of the exterior housing 2, Are provided at positions shifted from each other along a direction perpendicular to the exhaust direction of the exhaust fan 82. Further, the exhaust port 28 is provided at a position farther from the light source device 41 than the exhaust fan 82. In such a configuration, the high-temperature air discharged from the exhaust fan 82 along the exhaust direction is bent in a traveling direction so as to follow the direction in which the exhaust-side duct 80 is formed, and is straightened by the louver 81 to be exhausted. It is discharged from the mouth 28 to the outside of the exterior housing 2.

  In the present embodiment as described above, after the light emitted from the light source device 41 enters the inside of the power supply block case 611 and the lamp drive block case 621 from the intake openings 611A, 621A, etc., the exhaust openings 611B, Even if leaking from the power supply block case 611 and the lamp drive block case 621 from 621B, the exhaust openings 611B and 621B face the image forming unit 4 in the image projection apparatus in the power supply block case 611 and the lamp drive block case 621. The light leaked from the exhaust openings 611B and 621B leaks to the outside of the exterior casing 2 through the exhaust opening 28 because it is not directed toward the exhaust opening 28 of the exterior casing 2. The possibility is small. Specifically, the exhaust openings 611B and 621B and the exhaust port 28 are connected in a substantially U shape in plan view via the intake side duct 83 and the exhaust side duct 80, as shown in FIG. Therefore, the light leaking from the exhaust openings 611B and 621B is blocked by the bent portion having a substantially U shape in plan view, and does not easily reach the exhaust port 28. As described above, according to the present embodiment, light leakage to the outside of the exterior housing 2 can be prevented.

  Even if dust or the like enters the exterior casing 2 from the exhaust port 28 of the exterior casing 2, the exhaust openings 611 </ b> B and 621 </ b> B of the power supply unit 6 are connected to the power supply block case 611 and the lamp drive block case 621. In the image projection apparatus, it is formed on the surface facing the image forming unit 4 and does not face the direction of the exhaust port 28 of the exterior casing 2. Is less likely to enter the power supply block case 611 and the lamp drive block case 621 through the exhaust openings 611B and 621B. Specifically, the exhaust openings 611B and 621B and the exhaust port 28 are connected in a substantially U shape in plan view via an intake side duct 83 and an exhaust side duct 80 as shown in FIG. In order for dust or the like that has entered the exterior casing 2 from the opening 28 to reach the exhaust openings 611B and 621B, the traveling direction needs to be changed by approximately 180 ° in accordance with the substantially U shape in plan view. Eventually, the dust or the like is difficult to reach the exhaust openings 611B and 621B. As described above, according to the present embodiment, it is possible to prevent dust and the like from coming into contact with the circuit elements and the like housed in the power supply block case 611 and the lamp drive block case 621, thereby preventing the occurrence of problems. can do.

  Further, the high-temperature air discharged from the light source device 41 and the power supply unit 6 can be collectively guided to the exhaust fan 82 by the intake side duct 83, and can be discharged to the outside of the exterior housing 2 by the exhaust fan 82. . The intake side duct 83 and the exhaust fan 82 can appropriately guide the high-temperature air heated in the light source device 41 and the power supply unit 6 to the exhaust port 28 of the exterior casing 2, and the exterior air can be passed through the exhaust port 28. Since it can be discharged to the outside of the housing 2, the cooling efficiency can be improved.

  Further, since it is not necessary to provide an exhaust fan for each of the light source device 41 and the power supply unit 6, the number of components inside the exterior housing 2 can be reduced, and the projector 1 can be downsized.

  Further, even if the light emitted from the light source device 41 leaks from the exhaust fan 82 through the intake side duct 83, as shown in FIG. 16, the exhaust fan 82 and the exhaust port 28 of the exterior housing 2 Since it is not positioned on a straight line along the exhaust direction of the exhaust fan 82, the light leaked from the exhaust fan 82 is less likely to leak outside through the exhaust port 28. Therefore, according to the present embodiment, it is possible to prevent light leakage to the outside of the exterior housing 2.

  Even if dust or the like has entered the exterior casing 2 from the exhaust port 28 of the exterior housing 2, the exhaust port 28 and the exhaust fan 82 are positioned in a straight line along the exhaust direction of the exhaust fan 82. Therefore, dust or the like entering from the exhaust port 28 is less likely to enter the intake side duct 83 through the exhaust fan 82, and the dust or the like can come into contact with the power supply unit 6 or the light source device 41 connected to the intake side duct 83. The property is remarkably small. Therefore, it is possible to prevent dust and the like from coming into contact with each circuit element constituting the power supply unit 6 or each part constituting the light source device 41, and to prevent occurrence of a malfunction.

  In addition, intake openings 611A and 621A of the power supply unit 6 are formed on the surface of the power supply block case 611 and the lamp driving block case 621 on the side facing the image forming unit 4 in the image projection apparatus, and the exhaust of the exterior housing 2 Since the direction of the opening 28 is not directed, the exhaust openings 611B and 621B of the power supply unit 6 are formed on the surface of the power supply block case 611 and the lamp driving block case 621 on the side facing the image forming unit 4 in the image projection apparatus. Similarly to the case where the light is discharged, the light leakage to the outside of the exterior housing 2 through the exhaust port 28 can be prevented, and the circuit elements and the like housed in the power supply block case 611 and the lamp driving block case 621 can be used. It is possible to prevent dust or the like that has entered through the exhaust port 28 from coming into contact, It is possible to prevent the occurrence of the condition.

  Further, since the intake duct 74 includes the power supply block 61 flow path and the lamp drive block 62 flow path, both blocks can be effectively cooled.

  In addition, each flow path formed in the intake duct 74 has a cross-sectional area appropriately set according to the heat generation amounts of the power supply block 61 and the lamp drive block 62, and therefore, the power supply block case 611 and the lamp drive block case 621. An appropriate amount of cooling air can be introduced into each interior, and efficient cooling can be performed.

  In addition, since the air intake duct 74 is formed so as to pass through the space below the image forming unit 4 in the image projection apparatus and both sides of the image forming unit 4 can be connected, the power supply unit arranged on one side The space on the other side of the image forming unit 4 as viewed from 6 can be used effectively as a space for arranging the sirocco fan 73. At this time, since the sirocco fan 73 is disposed in a limited space between the image forming unit 4 and the power supply unit 6, there is less restriction on the installation space of the sirocco fan 73. 73 can be selected.

  Further, as shown in FIG. 15, since the opening 832 of the intake side duct 83 is formed downward in the step portion 835, the light that enters the intake side duct 83 through the opening 832 is converted to light that travels downward. This light is limited and hits the lower part of the exhaust fan 82 and the bottom surface of the exhaust side duct 80, so that it is difficult to reach the exhaust port 28 of the exterior housing 2. Therefore, according to the present embodiment, it is possible to effectively prevent light leakage to the outside of the exterior housing 2.

  The present invention is not limited to the embodiment described above, and any modification of this embodiment within the scope that can achieve the object of the present invention is included in the technical scope of the present invention.

In the above-described embodiment, the exhaust openings 611B and 621B of the power supply unit 6 are substantially L-shaped in plan view of the image projection device on the surface facing the image projection device in the power supply block case 611 and the lamp drive block case 621. The exhaust openings 611 </ b> B and 621 </ b> B are connected to the image projection device in the power supply block case 611 and the lamp drive block case 621, although they are formed closer to one end in the shape (the end on the side where the light source device 41 is disposed). The object of the present invention can be achieved as long as it is formed on the opposing surface, and the formation position on the surface is not limited. Therefore, on the surface of the power supply block case 611 and the lamp driving block case 621 facing the image projection device, the position near the bent portion in the substantially L-shape of the image projection device in plan view and the plan view of the image projection device are omitted. The exhaust openings 611B and 621B may be formed at a position near the other end (the end on the side where the projection lens 3 is disposed) in the L shape.
Similarly, the intake openings 611A and 621A of the power supply unit 6 may be formed on the surface of the power supply block case 611 and the lamp driving block case 621 facing the image projection device, and the formation positions on the surfaces. Does not matter.

  In the above embodiment, the intake duct 74 is internally branched into the flow path for the power supply block 61 and the flow path for the lamp drive block 62. However, the intake duct 74 has such a branched structure. It may not be necessary, and it is good also as a structure provided only with one flow path. In this case, the two blocks of the power supply block 61 and the lamp drive block 62 are cooled by one flow path, and the cooling efficiency may be slightly reduced, but conversely the structure of the intake duct 74 is simplified. Therefore, the manufacturing cost can be reduced.

  In the above-described embodiment, the intake duct 74 is formed so as to pass through the space below the image forming unit 4 in the image projection apparatus, and both sides of the image forming unit 4 can be connected. It may be formed so as to pass through the upper space so that both sides of the image forming unit 4 can be connected. In short, if the intake duct 74 is formed so as to pass through the space around the image projection device and both sides of the image projection device can be connected, the space on both sides of the image projection device is arranged in the power supply unit 6 respectively. Therefore, it can be effectively used for arranging the sirocco fan 73.

  In the embodiment, the power supply unit 6 stores the power supply circuit element 61 and the like in the power supply block case 611, and the lamp drive circuit element and the like in the lamp drive block case 621. The power supply unit 6 may be configured such that a circuit element for supplying power and a circuit element for driving the lamp are housed in one case member. In this case, an opening corresponding to the intake opening 611A in the above embodiment is formed at a position corresponding to the power supply circuit element or the like in the case member, and a position corresponding to the lamp driving circuit element or the like in the case member. If an opening corresponding to the intake opening 621A in the above embodiment is formed and the intake duct 74 in the above embodiment is connected to both openings, each flow path formed in the intake duct 74 Circuit elements and the like can be cooled effectively and efficiently.

  The present invention can be used as a projector used in presentations and home theaters.

It is the perspective view which looked at the projector which concerns on embodiment of this invention from the front upper side. It is the perspective view which looked at the projector from the back upper side. It is the perspective view which looked at the projector from the back lower side. It is a perspective view which shows the state which removed the upper case of the exterior housing | casing of the projector. FIG. 5 is a perspective view showing a state in which a front case, a rear case, and a control board of the outer casing are removed from the state of FIG. 4. It is a perspective view which shows the state which removed the projection lens and the image formation unit from the state of FIG. It is a top view which shows typically the image projection apparatus of a projector. It is the perspective view which looked at the power supply unit of the projector from the back side of the projector. It is a perspective view which shows the air intake duct of a projector. It is a disassembled perspective view which shows the air intake duct of a projector. It is a disassembled perspective view which shows the cooling and exhaust structure of the power supply unit in a projector. It is a perspective view which shows the cooling and exhaust structure of the power supply unit in a projector. It is a perspective view which shows the exhaust unit of a projector. It is a perspective view which shows the specific flow of air in the cooling and exhaust structure in a projector. It is sectional drawing which shows the intake side duct of a projector. It is sectional drawing which shows the exhaust fan and exhaust side duct in a projector.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Exterior casing, 3 ... Projection lens, 4 ... Image forming unit, 5 ... Control board, 6 ... Power supply unit, 7 ... Cooling unit, 8 ... Exhaust unit, 22A2, 22A3 ... Intake port, 28 ... Exhaust port, 41 ... light source device, 61 ... power supply block, 62 ... lamp drive block, 73 ... sirocco fan, 74 ... intake duct, 74L ... left channel member, 74R ... right channel member, 74L2, 74R2 ... partition part 75 ... Sirocco fan, 80 ... Exhaust duct, 82 ... Exhaust fan, 83 ... Intake duct, 411 ... Luminescent tube, 412 ... Elliptic reflector, 414 ... Lamp housing, 451 ... Liquid crystal panel, 611 ... Power supply block case, 621 ... Lamp drive block case, 611A, 621A ... Intake opening, 611B, 621B ... Exhaust opening, 831, 832 833 ... opening, 836 ... air deriving unit.

Claims (5)

An image projection apparatus comprising: a light source device; a light modulation device that modulates a light beam emitted from the light source device according to image information; and a projection optical device that magnifies and projects the light beam modulated by the light modulation device; A projector including an exterior housing that houses an image projection device,
The image projection device has a substantially L shape, and the light source device, the light modulation device, and the projection optical device are sequentially arranged from one end side to the other end side of the substantially L shape in the image projection device. And
Inside the substantially L-shape of the image projection device, a power supply device that supplies power to each component of the projector is disposed,
The power supply device includes a case member that houses a circuit element,
A power exhaust opening for exhausting air inside the case member to the outside of the case member is formed on a surface of the case member facing the image projection device.
A projector characterized by that. The projector according to claim 1, wherein
The image projection device includes a light source housing that houses at least the light source device,
The light source housing is formed with a light source exhaust opening for discharging the air inside the light source housing to the outside of the light source housing,
A power supply air inlet that is connected to the power supply exhaust opening and can introduce air discharged from the power supply exhaust opening, and is connected to the light source exhaust opening and discharged from the light source exhaust opening. A duct including a light source air introduction part capable of introducing air and an air lead-out part that collectively draws out the air introduced from the power supply air introduction part and the light source air introduction part,
Connected to the air lead-out portion of the duct is an exhaust fan that sends the air led out from the air lead-out portion toward an exhaust port formed in the outer casing and exhausts the air to the outside of the outer casing through the exhaust port. To be
A projector characterized by that. The projector according to claim 2,
The exhaust fan and the exhaust port of the exterior housing are provided at positions shifted from each other along a direction perpendicular to the exhaust direction of the exhaust fan.
A projector characterized by that. The projector according to any one of claims 1 to 3,
A power supply intake opening for introducing cooling air into the case member is formed on the surface of the case member of the power supply device that faces the image projection device.
A projector characterized by that. The projector according to claim 4, wherein
The power supply device includes a power supply block that supplies power to each component of the projector, and a light source device drive block that drives the light source device,
The power supply block includes a power supply block case member as the case member that houses circuit elements,
The light source device drive block includes a light source device drive block case member as the case member that houses a circuit element,
A power supply block intake opening as the power supply intake opening for introducing cooling air into the power supply block case member is formed on a surface of the power supply block case member facing the image projection device. And
The light source device drive block as the power intake opening for introducing cooling air into the light source device drive block case member on the surface of the light source device drive block case member facing the image projection device An intake opening is formed,
Cooling air is introduced into the power supply block case member and the light source device drive block case member into the power supply block intake opening and the light source device drive block intake opening through the intake openings. For the intake duct is connected,
The intake duct includes a power supply block flow path for sending cooling air to the power supply block intake opening, and a light source apparatus drive block flow path for sending cooling air to the light source apparatus drive block intake opening. Configured with,
A projector characterized by that.

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