JPH10186513A - Projection display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection display device small in size and capable of efficiently cooling the inside of the device. SOLUTION: In this projection display device 1 provided with an optical unit 10, a power unit 7 and an outside case 2 for housing the optical unit 10 and the power unit 7, an intake opening 75 is formed in one end part of the power unit 7 and an exhaust opening 77 is formed in another end part. The intake opening 75 is arranged in the vicinity of the air intake of the outside case 2 and the exhaust opening 77 is arranged in the vicinity of the discharge port 160 of the outside case 2. Since the intake and exhaust openings 75 and 77 are provided, the inside of the unit 7 can independently and efficiently be cooled and the optical unit 10 and the unit 7 can densely be arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical unit for optically processing a light beam emitted from a light source lamp unit and enlarging and projecting an image on a projection surface by a projection lens unit, and supplying power to the optical unit. The present invention relates to a projection display device comprising: a power supply unit to be used; and an outer case that houses the optical unit and the power supply unit.

[0002]

2. Description of the Related Art Conventionally, an optical unit for optically processing a light beam emitted from a light source lamp unit and projecting an image on a projection surface by a projection lens unit, and a power supply unit for supplying power to the optical unit. There is known a projection display device including an outer case for housing the optical unit and the power supply unit, and a plurality of circuit boards for controlling the optical unit.

An optical unit of a projection display apparatus generally includes a light source lamp unit and a projection lens unit, a color separation optical system for separating a light beam emitted from the light source lamp into light beams of three primary colors, and a separated light beam. And a color synthesizing optical system that synthesizes each modulated light beam and emits the modulated light beam to the projection lens unit.

In such a projection display device,
For easy handling, it is desired to integrate the device and to reduce the size to the minimum necessary.

On the other hand, the above-mentioned projection display device incorporates a cooling mechanism for cooling a light source lamp, a power supply unit and a circuit board housed in an outer case.

Here, it is necessary to cool the power supply unit because the power supply unit includes a primary-side active filter, a power supply, a ballast, and the like, and the elements mounted thereon serve as heat sources. It is necessary to fix the heat sink to retain the heat, and to cool the heat sink.

[0007]

However, in such a projection type display device, it is necessary to mount the above-mentioned various optical systems and obtain a parallel light beam. Becomes large.

[0008] Therefore, if it is desired to sufficiently cool the inside of the apparatus, there is a problem that the components of the apparatus cannot be arranged very densely, and there is a limit to downsizing.

Another problem is that efficient cooling cannot be performed even if the components are forcibly arranged densely.

An object of the present invention is to provide an optical unit that optically processes a light beam emitted from a light source lamp unit and projects an image on a projection surface by a projection lens unit.
In a projection display device including a power supply unit that supplies power to the optical unit and an outer case that houses the optical unit and the power supply unit, the size of the device can be reduced, and the inside of the device can be efficiently arranged. An object of the present invention is to provide a projection display device that can be cooled.

[0011]

A projection display apparatus according to a first aspect of the present invention optically processes a light beam emitted from a light source lamp unit and enlarges and projects an image on a projection surface by a projection lens unit. A projection type display device, comprising: an optical unit that performs power, a power supply unit that supplies power to the optical unit and the light source lamp unit, and an outer case that houses the optical unit and the power supply unit. An air inlet for taking in cooling air from outside the device and an exhaust port for discharging air inside the device to the outside are formed, and one end of the power supply unit is arranged near the air inlet, One end is provided with an intake opening for taking in cooling air into the power supply unit, and the other end of the power supply unit is provided with the power supply unit. An exhaust opening for discharging air inside the unit is provided, and the light source lamp unit is provided between an exhaust opening formed in the outer case and an exhaust opening provided at another end of the power supply unit. The air exhausted from the exhaust opening formed at the other end flows through the inside of the light source lamp unit and is used as cooling air for the light source lamp.

According to the first aspect of the present invention, since the power supply unit has the intake opening and the exhaust opening, the inside of the power supply unit can be efficiently cooled independently of the other parts. This makes it possible to reduce the size of the apparatus by closely arranging the optical unit and the power supply unit.

Here, it is preferable that an intake fan is provided in the above-mentioned intake opening.

That is, since the cooling air can be forcibly taken into the power supply unit by the intake fan, the cooling efficiency inside the power supply unit can be further improved.

Preferably, the above-mentioned exhaust port is provided with a light shielding means for covering the exhaust port from the inside.
For example, it is preferable to adopt a louver-like member formed by stacking a plurality of plate-like members having a length dimension spanning the exhaust port.

That is, since the light-shielding means is provided at the exhaust port, even if the light source lamp unit is arranged near the exhaust port, no light leaks from the exhaust port, and the usability of the projection display device is further improved. I do.

Further, since the light shielding means is formed in a louver shape, the exhaust from the exhaust port is not blocked by the light shielding means, and an appropriate exhaust state is ensured.

Further, the above-mentioned light source lamp unit comprises:
A light source lamp comprising a lamp body and a reflector, and a box-shaped lamp housing for accommodating the light source lamp, wherein the cooling air is supplied to the side of the lamp housing substantially orthogonal to an opening of the reflector by the lamp. Preferably, a ventilation hole leading to the main body is formed.

That is, since the lamp housing constituting the light source lamp unit has a ventilation hole, cooling air is supplied to the lamp body by the ventilation hole, and the cooling efficiency of the light source lamp unit is promoted.

Preferably, the above-mentioned ventilation hole is provided with a rectifying plate for guiding cooling air to the lamp body.

That is, since the flow regulating plate is provided in the ventilation hole, when the cooling air flows through the ventilation hole, the lamp body can be appropriately cooled, and the cooling efficiency of the light source lamp unit is further promoted. Is done.

A color separation optical system in which the optical unit separates the light beam into a plurality of light beams; a modulation system in which each of the separated light beams is modulated based on image information and emitted as a modulated light beam; And a color synthesizing optical system that emits the light to the projection lens unit, and the above-described air intake port is preferably formed below the color synthesizing optical system.

That is, since the air intake is formed below the color synthesizing optical system, the cooling air taken in from outside cools the color synthesizing optical system and the modulation system first. After cooling them, the cooling air can cool other parts such as the light source lamp unit, the power supply unit, and the circuit board, which are higher in temperature. Will be

Further, when a circuit board for controlling the optical unit is provided above the optical unit, a part of the cooling air taken in from the air intake is collected in the upper part of the color combining optical system, It is preferable that the gas flows along the circuit board and is discharged from the exhaust port.

Here, the circuit board provided above the optical unit may be provided by laminating not only one circuit board but also a plurality of circuit boards having different functions. For example, a driver board and a video board are stacked. It may be provided on an optical unit.

That is, since the cooling air flows along the circuit board at a higher temperature than the color synthesis engineering system and the modulation system,
It is possible to use the air that has cooled the color synthesis optical system and the modulation system as cooling air for the circuit board, and to use the air after cooling as cooling air for the higher-temperature light source lamp unit. The cooling efficiency in the interior is further improved.

When the above-mentioned air intake is formed below the color synthesizing optical system, it is preferable that dustproof means is provided above the color synthesizing optical system, that is, above the color synthesizing means. Since the dustproof means is provided, it is possible to prevent dust and the like from flowing back to the color combining optical system when the flow of the cooling air is stopped.

The projection display apparatus according to the second invention of the present application optically processes a light beam emitted from a light source lamp unit, and enlarges and projects an image on a projection surface by a projection lens unit. A projection display device including a substantially L-shaped power supply unit that supplies power to an optical unit and a light source lamp unit, and an outer case that houses the optical unit and the power supply unit, wherein the outer case includes: An air intake for taking in cooling air from outside of the apparatus is formed, the power supply unit is arranged on a side of the optical unit, and one end of the power supply unit is arranged near the projection lens unit. And

According to the second aspect of the invention, since the intake opening of the power supply unit is formed near the projection lens unit, it is possible to introduce cooling air from the gap between the outer case and the projection lens unit. Thus, as described above, the power supply unit can be efficiently cooled, and the size of the device can be reduced. In particular, since the power supply unit is configured in a substantially L-shape, the power supply unit can be efficiently stored in a space partitioned by the outer case, the optical unit, and the projection lens unit,
The size of the device can be further reduced.

Here, at one end of the power supply unit described above, an intake opening for taking in the cooling air into the power supply unit is provided, and at the other end of the power supply unit, the air intake opening inside the power supply unit is provided. Preferably, an exhaust opening for discharging air is provided, and the one end of the power supply unit is arranged near an air intake provided in the outer case.

That is, since the power supply unit is substantially L-shaped, the intake opening can be arranged near the air intake, and the cooling efficiency of the power supply unit is further improved.

Preferably, the above-mentioned light source lamp unit is disposed between an exhaust port formed in the outer case and an exhaust opening provided at the other end of the power supply unit.

That is, since the light source lamp unit is disposed between the exhaust port and the exhaust opening, the cooling air that has cooled the inside of the power supply unit can be used for cooling the light source lamp unit having a higher temperature. Further, the cooling efficiency in the apparatus can be further improved.

The projection display apparatus according to the third invention of the present application includes an optical unit that optically processes a light beam emitted from a light source lamp unit and enlarges and projects an image on a projection surface by a projection lens unit. An external temperature detecting means for detecting a temperature outside the device,
Internal temperature detection means for detecting the temperature inside the device,
An internal temperature detected by the internal temperature detecting means;
The cooling control of the projection display device is performed according to a temperature difference from an external temperature detected by the external temperature detecting means.

Here, the cooling control of the apparatus means, for example, control of the amount of air blown by an intake fan, an exhaust fan or the like provided in the apparatus, or control of turning off the lamp body of a light source lamp unit having a large amount of heat generation. Etc.

According to the third aspect of the present invention, the cooling of the apparatus is controlled according to the temperature difference between the external temperature and the internal temperature. Therefore, the actual temperature of the components of the apparatus depends on the temperature of the discharged cooling air. The temperature can be ascertained, and appropriate cooling control can be performed.

In the above, the above-mentioned projection type display device has an outer case for housing the light source lamp unit and the optical unit, and the outer case is formed with an air intake for taking in cooling air from outside the device. It is preferable that the external temperature detected by the detecting means is a temperature of air taken in from an air intake provided in the outer case.

That is, since the temperature detected by the external detecting means is the temperature of the air taken in from the air inlet, it is possible to detect the external temperature of each component of the projection display just before cooling. High-precision cooling control can be performed.

[0039]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a projection display according to an embodiment of the present invention.

1. 1A and 1B show a front view and a rear view of a projection display device 1 according to a first embodiment, and FIG.
FIG. 2B shows a top view and a bottom view of the projection display device 1.

The projection display device 1 has a substantially rectangular parallelepiped shape, and includes an outer case 2 in which an optical unit 10 described later is housed, and a front surface of the outer case 2 as can be seen from FIG. And a projection lens unit 6 protruding from the lens.

The outer case 2 is divided into upper and lower parts at a substantially central portion of the projection lens unit 6, and includes an upper case 3 for covering the upper surface of the projection display device 1, a lower case 4 for covering the lower surface, and FIG. B), and a rear case 5 that covers the rear surface of the projection display device 1.

2. Structure of Outer Case The upper case 3 includes a rectangular upper wall 3a, left and right side walls 3b and 3c extending substantially vertically downward from three sides excluding the rear side, and a front wall 3d.

As shown in FIG. 2A, a large number of communication holes 2 are formed at the left and right ends on the front side of the upper wall 3a of the upper case 3.
5R and 25L are formed, and these communication holes 25R and 25L are formed.
A built-in speaker (not shown) is provided in a portion inside the device corresponding to L. An operation switch 26 for adjusting the image quality, focus, and the like of the projection display device 1 is provided at a substantially central portion of the upper wall 3a.

As can be seen from FIG. 1A, a light receiving plate 351 for receiving a remote control having the same function as the operation switch 26 is provided on the front surface of the apparatus, and the projection display apparatus 1 is remotely operated. It is possible to do.

The lower case 4 has a rectangular bottom wall 4a,
It is formed of left and right side walls 4b, 4c and a front wall 4d which stand substantially vertically from three sides excluding the rear side.

On the bottom wall 4a, as shown in FIG.
A lamp replacement cover 27 for replacing a light source lamp unit 8 (described later) housed therein and an air filter cover 23 having an air intake 240 for cooling the inside of the apparatus are provided.

The lamp replacement lid 27 is provided with a large number of air intake holes 271, and cooling air is supplied not only from the air intake 240 but also from the air intake holes 271 to the inside of the apparatus.

The bottom wall 4a is provided on the bottom wall 4a as shown in FIGS.
As shown in (B), rear end feet 31R and 31L are provided at left and right corners at the rear end, and a front end foot 31 for height adjustment is provided at a position corresponding to the projection lens unit 6 at the front end.
C are provided, and these project from the lower surface side of the bottom wall 4a.

The rear end foot 31R is provided with an adjusting mechanism capable of adjusting the amount of protrusion by rotation, whereby the projection screen can be adjusted in the horizontal direction.
The front end foot 31C is provided with an adjustment mechanism that can adjust the projection screen in the vertical direction by using the foot button 310 shown in FIGS. 1A and 2A.

As shown in FIG. 3, a power cable shield plate 243 is provided inside the lower case 4, and the power cable shield plate 243 includes a wiring insertion portion 244 that covers the AC input line. I have.

The power cable shield plate 243 is provided to cut off noise generated from the AC input line.
1. Also serves as a ground bus line for the driver board 13.

The air intake 240 described above is
It is covered with a sponge-shaped air filter 241, so that intrusion of dust and the like from this portion can be prevented. Also, in the peripheral portion of the air intake 240,
A cushion material 242 made of urethane foam is arranged, so that intrusion of dust and the like from a peripheral portion of the air intake 240 can be prevented.

As can be seen from FIG. 2, the front wall 3d of the upper case 3 and the front wall 4d of the lower case 4 have their central portions curved slightly convexly forward. A circular opening 33 formed in the periphery is formed, and a portion on the front end side of the projection lens unit 6 protrudes from the opening 33.

The front end of the projection lens unit 6
It is supported by a guard portion 42 provided extending along the bottom wall 4a. The guard portion 42 is a thick rim that covers the distal end portion of the projection lens unit 6 in a hood shape.
By attaching a hand to the guard portion 42, the front end side of the apparatus can be lifted without placing a burden on the projection lens unit 6.

The rear case 5 basically has a structure for guiding and holding the spigot portions of the upper case 3 and the lower case 4 from outside.

Although not shown in FIG. 1B, the upper end of the rear case 5 is engaged with three hook portions formed along the inner edge of the upper case 3. The lower end is held by being screwed from the inside of the lower case 4.

The rear wall 5d of the rear case 5 has a structure shown in FIG.
As can be seen from the figure, an AC inlet 51 for external power supply and various input / output terminal groups 50 are arranged on the left side.
An overhang portion 501 is formed on the right side. The overhang portion 501 is provided with an exhaust port 160 for discharging air inside the apparatus.

As described above, the AC inlet 51 to which the cord such as the signal cable is connected to the rear wall 5 d of the rear case 5.
And the input / output terminal group 50 are arranged, so that a user is not connected to a signal cable or the like on the side of the device where the user is usually located, and the usability is good.

3. 4 and 5 show the internal structure of the projection display device 1. FIG. As can be seen from FIG.
Inside the optical unit 10 for enlarging and projecting image information
And a power supply unit 7 arranged on the side of the optical unit 10 for supplying power to the optical unit 10 are housed.

Further, in a portion of the optical unit 10 adjacent to the light source lamp unit 8, an exhaust fan 16 for exhausting the air inside the apparatus and an exhaust port 160 are provided.

Further, as can be seen from FIG. 5, below the prism unit 910 of the optical unit 10, an intake fan 24 for taking in external air into the apparatus and an air intake 240 are provided.

Then, above the optical unit 10, a driver board 13 for device drive control and a video board 11
Are stacked.

3-1. Optical Unit Structure As shown in FIG. 4A, an optical unit 10 optically processes a light source lamp unit 8 and a light beam emitted from the light source lamp unit 8 to form an optical image corresponding to image information. An optical lens unit 9 to be formed, a prism unit 910 for synthesizing an optical image formed by the optical lens unit 9, and a projection lens unit 6 for enlarging and projecting the synthesized optical image on a projection surface. .

The light source lamp unit 8 and the optical lens unit 9 are housed in a light guide 100 having a substantially L-shaped light path. The prism unit 910 is
The projection lens unit 6 is disposed in the cutout portions 9001 and 9002 (see FIG. 6) of the light guide 100, and is provided so as to protrude from the side surface of the light guide 100.

The optical path from the light source lamp unit 8 to the projection lens unit 6 is substantially L-shaped as a whole.
Accordingly, the planar shape of the light guide 100 is correspondingly substantially L-shaped. The light guide 100
The rear half of the inner space of the outer case 2 is occupied.

The light source lamp unit 8 is housed in a replaceable state at the position of the light source lamp unit housing part 800 shown in FIG.

3-2. Structure of Power Supply Unit On the other hand, the power supply unit 7 is, as understood from FIG.
The projection lens unit 6 and the light guide 100 housed in the outer case 2 are housed in a portion other than the occupied portion, that is, in the power supply unit housing 700 shown in FIG.
A main body portion extending forward along the side wall 2c of the outer case 2 with the base end near the light source lamp unit 8 as a base end;
The plane shape including the extended portion 72 which is bent at the front end of the main body portion 71 and faces the projection lens unit 6 is substantially L-shaped.

An opening 75 for intake is formed on the side surface of the extended portion 72 serving as one end of the power supply unit 7, and the side surface of the end of the main body portion 71 serving as the other end is provided on the side surface. , An exhaust opening 77 is formed.

Since the air intake 240 formed in the outer case 2 is located below the prism unit 910, the intake opening 75 is located near the air intake 240 and near the projection lens unit 6. Will be done.

Although not shown in FIG. 4, the power supply unit 7 contains a primary-side active filter, a power supply, and a ballast.

The primary-side active filter includes a transmitting FET, and the power supply includes a rectifying diode bridge, a D / D converter oscillation transistor, and a D / D converter oscillation transistor.
The ballast includes a chopper circuit drive FET and a chopper circuit backflow prevention diode, and these elements are mounted on a circuit board.

Since each of these elements generates heat, a heat sink is fixed to prevent the temperature of the element itself from rising, and the intake fan 1 provided in the intake opening 75 is provided.
7, the heat sink is forcibly cooled.

As described above, by utilizing the fact that the optical unit 10 is substantially L-shaped and the power supply unit 7 is also substantially L-shaped, it is partitioned by the light guide 100, the projection lens unit 6, and the outer case 2. Area is not wasted. That is, since the optical unit 10 and the power supply unit 7 can be efficiently arranged in a narrow area, the size of the projection display device 1 can be reduced.

Although not shown in FIG. 4, an input line from the power supply unit 7 to the light source lamp unit 8 is connected to the light source lamp unit 8 via a connector. The input line is shielded by a shield material so that noise is not generated.

3-3. Arrangement Structure of Substrate As shown in FIG. 5A, a driver substrate 13 for controlling liquid crystal drive is screwed and fixed to the upper surface of the optical unit 10 above the optical unit 10 and parallel to the upper surface thereof. Video board 11 on which video signal processing circuit is mounted
Is arranged. Among these two substrates 11 and 13, a sheet-shaped shield member 12 is disposed between the optical unit 10 and the driver substrate 13 located on the lower side.

The electrical connection between the substrates 11 and 13 is as follows. First, the connector 110 is arranged on the lower surface of the video board 11, and on the upper surface of the driver board 13,
A connector 130 that can be inserted and connected to the connector 110 is arranged.

Therefore, when the boards 11 and 13 are stacked at a predetermined position, the connector 110 and the connector 130 are connected.

As described above, in the present embodiment, the connection between the substrates is performed without leading the lead wires or the like. Therefore, the number of noise sources is small, and the generation of noise can be suppressed.

Further, both ends of the driver board 13 and the video board 11 are arranged near the rear wall 5 d of the rear case 5. The input / output terminals of the D-sub connector are directly attached to the end of the video board 11 near the rear wall 5 d of the rear case 5 to form a part of the input / output terminal group 50 of the rear case 5. I have.

Accordingly, since the wiring distance between the input / output terminal 50 disposed on the rear wall 5d of the rear case 5 and the driver board 13 and the video board 11 can be reduced, a high-speed and weak signal is processed. The circuit system is not easily affected by noise.

Further, as can be seen from FIG. 5A, the shield member 12 is provided with an extended portion 12a, and the extended portion 12a covers at least a part of the connectors 110 and 130. . Therefore, it is possible to prevent noise generated from the light source lamp unit 8 (not shown in FIG. 5) and the like arranged almost directly below the connectors 110 and 130 from entering the connectors 110 and 130. is there.

Note that the driver substrate 13 is the optical unit 1
The structure fixed to the top surface of the optical unit
This is convenient when selling 0 as a part. That is, the light valve 92 normally incorporated in the optical unit 10
The operating characteristics of 5R, 925G, and 925B are slightly different for each optical unit 10. Therefore, in order to obtain the same quality image in all the optical units 10, the difference in the operation characteristics must be compensated by an electrical adjustment. Such electric adjustment is performed by the light valves 925R, 925.
It is possible by changing the driving conditions of G, 925B. That is, the predetermined driving condition may be stored in a circuit incorporated in the driver board 13.
If a structure in which the driver substrate 13 is screwed and fixed to the upper surface of the optical unit 10 as in the present embodiment is adopted, the optical adjustment is completed in a state where the optical unit 10 and the driver substrate 13 are set as a set. It is possible to sell the optical unit 10 in a state where it has been completed, and it is not necessary for the customer to make any electrical adjustments.

On the lower surface side of the optical unit 10, a remote board 14 on which a remote signal processing circuit for performing signal processing input from a mouse or the like is mounted, is disposed between the remote board 14 and the optical unit 10. Is provided with a shield plate 15. Here, the remote board 14
Are disposed so as to be able to be inserted and withdrawn from the rear end side of the apparatus, that is, from the rear wall 5d side of the rear case 5. Therefore, even if it is necessary to use a circuit board having a different circuit configuration for a remote circuit for a mouse or the like depending on the model, it can be easily dealt with by replacing the remote board 14 from the rear end side of the apparatus. Between the rear case 5 end surface of the optical unit 10 and the rear case 5, an audio board 18 for interfacing television images and audio signals is disposed horizontally with respect to the end surface. Are connected by wires to the ends. Further, as shown in FIG.
A metal chassis 19 is arranged between 8 and the rear case 5. The chassis 19 and the shield plate 15 are screwed, and the chassis 19 is set to the ground potential. By arranging the respective substrates close to each other in this manner, the distance between the wirings is reduced, and the structure is configured so as to be less affected by noise.

The audio board 18 is mounted on a chassis 19.
Are fixed by screws 20 to a bent and raised portion 19a provided in a part of the audio substrate 18 so as to withstand the insertion / extraction force applied to the interface terminals mounted on the audio board 18.

[0086] 4. Optical System An optical system incorporated in the optical unit 10 will be described with reference to FIG.

The optical system of this embodiment comprises a light source lamp unit 8 and three light valves 925R, 925G, 92
An illumination optical system 923 for equalizing the in-plane illuminance distribution of the light illuminating 5B, and a color separation for separating the light flux emitted from the illumination optical system 923 into red, green, and blue light fluxes R, G, and B. An optical system 924, and three light valves 925R, 925G, and 925B constituting a modulation system for modulating each color light beam;
It comprises a prism unit 910 as a color synthesizing optical system for re-synthesizing the modulated color light beam, and a projection lens unit 6 for enlarging and projecting the synthesized light beam on a screen.

4-1. Light Source Lamp Unit As shown in FIG. 6, the light source lamp unit 8 includes a light source lamp 801 and a substantially box-shaped lamp housing 802 containing the same.

The light source lamp 801 includes a lamp main body 805 such as a metal halide lamp and a reflector 806, and emits light from the lamp main body 805 toward the optical lens unit 9.

The lamp housing 802 has an opening on the front surface in the optical axis direction, and has left and right sides substantially orthogonal to the front surface.
Vent holes 808, 80 for introducing and discharging cooling air
9 are formed. On the other hand, ventilation holes 8 for introducing and discharging cooling air are also provided on the left and right side surfaces of the reflector 806.
03, 804 are formed.

As shown in FIG. 6B, a flow straightening plate 820 is provided at the entrance of the cooling air vent 808 so that the cooling air can pass through the reflecting surface 80 of the reflector 806.
6a and the lamp body 805 can be efficiently guided. The current plate 841 is connected to the lamp housing 8.
02 is mounted on the side wall 807 in the vicinity of the ventilation port 808 so as to sandwich it, and the dowel 807 provided on the side wall 807 is provided.
a.

Further, of the lamp housing 802,
A cutout portion 810 is provided on a part of the side surface on the side of the ventilation port 809 so as not to hinder the flow of cooling air. A power plug 811 for supplying power to the lamp housing is provided on a side surface of the lamp housing.

In this embodiment, the light source lamp 801 is fixed to the lamp housing 802. Therefore, when replacing the light source lamp 801 from the lamp replacement lid 27 (see FIG. 2) of the outer case described above, the entire lamp housing 802 is attached and detached.

4-2. Illumination Optical System The illumination optical system 923 includes an aggregate of minute lenses, and has integrator lenses 921 and 922 that divide light emitted from the light source lamp unit 8 into a plurality of partial light beams by the minute lenses. A polarization conversion element 920 that converts a partial light beam, which is an aggregate of random light, into light having the same polarization direction, and a light valve 925 that converts the partial light beam into a light beam having the same polarization direction.
R, 925G, superimposing lens 9 for superimposing on the surface of 925B
30.

As shown in FIG. 7, the polarization conversion element 920 includes a polarization beam splitter array 9201 and a selective retardation plate 9202. The polarization beam splitter array 9201 has a columnar shape having a parallelogram cross section. Have a shape in which they are bonded together.

At the interface of the light-transmitting plate material 9203, polarization separation films 9204 and reflection films 9205 are formed alternately.

The polarization beam splitter array 92
No. 01 is manufactured by laminating a plurality of plate glasses on which these films are formed and cutting obliquely at a predetermined angle so that the polarization separation films 9204 and the reflection films 9205 are alternately arranged.

Then, the integrator lenses 921, 9
The partial luminous fluxes divided by 22 are respectively separated into P-polarized light and S-polarized light by the polarization separation film 9204,
The P-polarized light is converted into S-polarized light by a λ / 2 retardation layer 9206 selectively formed on the selective retardation plate 9202 and emitted.

On the other hand, the S-polarized light is reflected by the polarization separation film 9204, further reflected by the reflection film 9205, and then emitted as S-polarized light.

The luminous flux thus aligned to the S-polarized light is, as shown in FIG.
The light is reflected by a reflection mirror 931 disposed at the corner of the light beam and sent to the color separation optical system 924.

As described above, since the illumination optical system 923 includes the polarization conversion element 920, the light use efficiency is increased as compared with a case where random polarized light in which P-polarized light and S-polarized light are mixed is used as it is, and The color separation in the dichroic mirrors 941 and 942 described later is improved. In addition, since the S-polarized light has a higher reflectance than the P-polarized light, there is also an advantage that a light amount loss or the like can be suppressed.

4-3. Color Separating Optical System and Modulating System As shown in FIG. 4B, the color separating optical system 924 includes a red-green reflecting dichroic mirror 941, a green reflecting dichroic mirror 942, and a reflecting mirror 943.

The blue luminous flux B contained in the luminous flux emitted from the illumination optical system 923 passes through the red-green reflecting dichroic mirror 941 and is reflected at a right angle by the rear reflecting mirror 943 to emit the blue luminous flux. To prism unit 9
The light is emitted to the side 10.

The red and green light beams R and G are reflected by a mirror 941 and reflected by a green reflecting dichroic mirror 942.
Only the green light flux G is reflected at a right angle, and is emitted from the emission part of the green light flux toward the color combining optical system.

The red light beam R passing through the mirror 942
Is emitted from the emission part of the red light beam to the light guide system 927 side.

At the exit side of the exit of the red light beam R and the green light beam G of the color separation optical system 924, a condenser lens 95 is provided, respectively.
1, 952 are arranged, and the luminous flux emitted from each emission unit is
The light is collimated by these condenser lenses 951 and 952.

4-4. Modulation system and color combining optical system The blue and green light fluxes B and G thus collimated enter the light valves 925B and 925G and are modulated.
Image information corresponding to each color light is added.

That is, these light valves 925
Switching of B and 925G is controlled by driving means (not shown) in accordance with image information, whereby each color light passing therethrough is modulated.

As such a driving means, known means can be used as it is.

On the other hand, the red light flux R is guided to the corresponding light valve 925R via the light guide system 927, where it is similarly modulated according to image information.

The light guide system 927 includes an incident side lens 974,
Incident-side reflecting mirror 971 and emitting-side reflecting mirror 972
, An intermediate lens 973 disposed therebetween, and a condenser lens 953 disposed in front of the light valve 925B.

The length of the optical path from the light source lamp unit 8 to each of the light valves 925R, 925G, and 925B is the longest in the case of the red light flux R, and therefore, the loss due to light diffusion is the largest in the case of red light. . However, by arranging such a light guide system 927, it is possible to suppress the loss of red light to some extent.

Incidentally, the light valve 92 in the present embodiment is used.
5R, 925G, and 925B are liquid crystal light valves including a pair of polarizing plates and a liquid crystal panel disposed therebetween.

4-5. Color Combining Optical System Next, each color light beam modulated through each light valve 925R, 925G, 925B is incident on a prism unit 910 constituting the color combining optical system, where it is recombined.

The recombined light beam is enlarged and projected as a color image on a screen at a predetermined position through the projection lens unit 6.

As described above, in this embodiment, the light beam emitted from the light source lamp unit 8 is reflected by the reflection mirror 931 in the light guide 100, and is reflected by the light guide 100.
Travels along an L-shaped optical path in a large circle along the L-shaped planar shape of the color separation optical system 924 and the prism unit 910.
To reach.

Therefore, the optical path is set to be as long as possible while each optical system component is arranged in a narrow area. Therefore, while using a lens having a small F-number and securing a sufficient arrangement position of the integrator lenses 921 and 922 and the polarization conversion element 920, the light beam emitted from the light source lamp unit 8 is converted into a parallel light beam by the light valve 925.
R, 925G, and 925B.

The integrator lenses 921 and 92
The number of divisions can be increased as much as the arrangement position of 2 can be secured sufficiently wide.

Therefore, the integrator lens 92
1, 922 can be arranged in an optically reasonable state, and as a result, downsizing can be achieved. in addition,
By making the integrator lenses 921 and 922 the same size, more telecentric illumination light can be obtained, so that the condensed image of each partial light beam formed on the polarization separation film 9204 of the polarization conversion element 920 can be reduced. In addition, variations in the size of each condensed image can be suppressed, and the utilization efficiency of illumination light can be increased.

[0120] 5. Structure of Light Guide In the above optical system, all of the optical elements other than the light source lamp unit 8, the prism unit 910 constituting the color synthesizing unit, and the projection lens unit 6 have upper and lower lights having the shape shown in FIG. It is configured to be sandwiched and held between guides 901 and 902 from above and below. The light source lamp unit 8 is housed in a light source lamp unit housing part 800 formed in the lower light guide 901.

Upper light guide 902, lower light guide 9
01 is integrated with the prism unit 910 and the projection lens unit 6 via a head plate 903 described later,
It is fixed to the lower case 4 by fixing screws. Therefore, a rectangular cutout 9001 is formed on the lower surface of the lower light guide 901 and the upper surface of the upper light guide 902 to fix the prism unit 910 and the head plate 903.
9002 is formed.

The partition wall 9003 of the lower light guide 901 located near the light source lamp housing section 800 has
An opening 9004 for supplying cooling air to the light source lamp unit 8 is formed.

Further, the illumination optical system 9 of the optical unit 10
An opening 907 for cooling the illumination optical system 923 is provided on the side and bottom surfaces of the region 900 in which the
908 are formed.

An opening 9021 is formed in the upper part of the upper light guide 902, and the opening 9021 and the above-mentioned opening 9004 are connected by a duct 9028.

6. Structure of Head Plate The prism unit 910 is fixed to a front surface side (a front side in FIG. 9) of a thin head plate 903 which is a magnesium die-cast plate shown in FIG. 9 by fixing screws.

The head plate 903 basically includes a vertical wall 91 extending vertically in the width direction of the apparatus and a bottom wall 92 extending horizontally from the lower end of the vertical wall 91 and supporting the prism unit 910. It is configured.

At the center of the vertical wall 91, a rectangular opening 9 through which light emitted from the prism unit 910 passes is provided.
1b is formed. The vertical wall 91 has four screw holes 91 d for fixing the base end side of the projection lens unit 6.
The dowels 91e for positioning are formed in two places. In the vertical wall 91, on both sides of the opening 91b, the supported portion 9 supported by a pair of support portions 40 (see FIG. 3) provided on the inner surface side of the lower case 4.
3 (only one is shown) is provided.

In the portion corresponding to the mounting position of the prism unit 910 on the bottom wall 92, three communication holes 91g communicating with the lower surface of the bottom wall are formed, and the mounting portion 91h of the prism unit 910 is formed on the communication hole 91g. Are formed.

The attachment portion 91h has a screw hole 91
The prism unit 910 is fixed to the head plate 903 using the screw holes 91c.

As described above, since the prism unit 910 and the projection lens unit 6 are fixed in a state where the vertical wall 91 having high rigidity is sandwiched and aligned, the integration thereof is high, and an impact force or the like acts. However, there is an advantage that mutual displacement is extremely unlikely to occur.

Further, the prism unit 910 is mounted on a head plate 903 made of a magnesium molded product, and is supported by the light guides 901 and 902 via the head plate 903. When configured in this manner, the magnesium molded product has excellent heat dissipation in addition to excellent moldability, so that the prism unit 910 that easily generates heat is formed.
It is possible to prevent the peripheral portion from becoming hot.

Further, since the magnesium molded product has a small specific gravity, the weight of the optical unit 10 can be reduced.

7. Cooling Structure of Each Component In the projection display apparatus 1 configured as described above, the cooling of the optical unit 10, the power supply unit 7, the video board 11, and the driver board 13 is forcibly performed by the above-described intake fans 15, 17 and the exhaust fan 16. It is done on a regular basis.

7-1. Intake from air intake 240 and prism unit 910, light valve 925
R, 925G, 925B cooling and dust prevention As can be seen from FIG. 5, the intake of external air is mainly performed by the intake fan 24 provided below the prism unit 910.
This is performed from the air intake 240.

A part of the cooling air taken in from the air inlet 240 is supplied as cooling air for the prism unit 910 and the light valves 925R, 925G, 925B.

FIG. 10 is a partial sectional view showing a detailed configuration around the prism unit 910. FIG. 10 shows only a cross section of the light valve 925G.

Around the three light entrance surfaces of the prism unit 910, three light valves 925R, 925G,
925B are arranged. The light valves 925R, 925G, and 925B in the present embodiment include a pair of polarizing plates 962 and 963 and a liquid crystal panel 96 disposed therebetween.
1 is a liquid crystal light valve. LCD panel 96
The light-emitting surface 1 and the light-exiting-side polarizing plate 963 arranged on the light-emitting surface side are fixed to the light-incident surface of the prism unit 910. On the other hand, the incident side polarizing plate 962 disposed on the light incident surface side of the liquid crystal panel 961 is a metal polarizing plate fixing plate 9.
60 is fixed to the surface on the liquid crystal panel 961 side. The polarizing plate fixing plate 960 includes three light valves 925R, 92
The three light valves 925R, 925G, and 925 are provided on a wall formed so as to surround the light incident surfaces of 5G and 925B.
An opening having an area slightly smaller than the area of B is formed. The incident side polarizing plate 962 is fixed by bonding its peripheral part to the peripheral part of this opening. The incident side polarizing plate fixing plate 960 of the incident side polarizing plate fixing plate is fixed to the bottom wall 92 of the head plate 903. Further, a flexible substrate 964 is connected to the liquid crystal panel 961. The flexible substrate 964 includes an upper light guide 902
Is sandwiched between a prism member 923 and a cushion member 9023 attached to a standing wall portion 9022 provided at the bottom. The tip of the flexible board 964 is connected to a connector formed on the board 13 (not shown).

The head plate 903 on which the prism unit 920 and the three light valves 925R, 925G, 925B are mounted is mounted above the air inlet 240. The air filter 241 arranged to cover the air intake 240 and the cushion member 242 arranged around the air filter 241 are sandwiched and fixed by a rib 91f provided on the lower surface of the head plate 903. The intake fan 24 is disposed between the prism unit 920 and the air filter 241.

The light input / output surface of the prism unit 910 is surrounded by the lower light guide 901 and the vertical wall 91 of the head plate 903. Further, the prism unit 910
Above are a metal mesh 926a and a resin frame 92.
6b.

As described above, the space 911 surrounded by the air intake 240, the vertical wall 91 of the head plate 903, the lower light guide 910, and the duct 926 is formed around the prism unit 901. A cooling path from the air intake 240 to the duct 926 is configured.

This cooling path will be described in detail. First, the cooling air taken in from the air inlet 240 by the intake fan 24 is supplied to the bottom wall 9 of the head plate 903.
The prism unit 910, the liquid crystal panel 961, the input / output side polarizing plates 962 and 9 pass through the communication hole 91g provided in
The surface of 63 is cooled. Here, the input / output side polarizing plate 962,
Since 963 transmits only specific polarized component light among incident light and absorbs the remaining polarized component light, it is particularly easy to generate heat. Polarizers are relatively weak to heat, and liquid crystal panels tend to change their operating characteristics due to heat. Therefore, the periphery of the liquid crystal panel is a portion that particularly needs cooling. In the present embodiment, the incident-side polarizing plate fixing plate 960 also functions as a rectifying plate, and the cooling air can be efficiently guided to the periphery of the liquid crystal panel by the incident-side polarizing plate fixing plate. Further, the polarizing plate fixing plate 96
If 0 is made of a material having a high thermal conductivity such as aluminum, it is possible to promote the cooling of the incident-side polarizing plate, in particular, by radiating heat from the polarizing plate fixing plate.

Next, a dustproof structure around the prism unit 910 will be described.

Light valves 925R, 9 for forming images
If dust or the like adheres to 25G, 925B, or a prism unit 910 that synthesizes an image formed by these light valves, a shadow due to the dust or the like appears on an image (projected image) projected on the projection surface. Therefore, preventing dust or the like from entering the space 911 surrounded by the air intake 240, the vertical wall 91 of the head plate 903, the lower light guide 910, and the duct 926 is preferable in terms of improving the quality of a projected image.

In the present embodiment, the air filter 241 and the cushion member 242 are provided as dustproof means, and by these, it is possible to prevent dust and the like from entering the space 911 from the air intake port 240. further,
In the present embodiment, the duct 926 is provided as dustproof means, so that when the intake fan 24 is stopped, it is possible to prevent dust and the like from flowing back into the space 911. Therefore, in the projection display device of the present embodiment, dust and the like do not enter the space 911, and an extremely high-quality image can be obtained.

7-2. Cooling of circuit boards 11 and 13 prism unit 910 and light valve 925R;
The cooling air that has cooled the 925G and 925B is supplied to the duct 9
The light is discharged from the optical unit 26 and guided to the upper part of the prism unit 910, and is supplied as cooling air for the video board 11 and the driver board 13 provided on the upper part of the optical unit 10, as shown in FIGS. . In order to allow cooling air to flow along each of the video substrate 11 and the driver substrate 13 to be laminated, a cutout 131 is formed in a portion of the driver substrate 13 disposed below which covers the prism unit 910. Have been.

The air flowing along the substrates 11, 13 is
The light source lamp unit 8 is driven by the exhaust power of the exhaust fan 16.
(Path A1).

7-3. Cooling of Power Supply Unit 7 On the other hand, a part of the cooling air taken in from the air intake 240 is also used for cooling the power supply unit 7 through the opening 91 b of the head plate 903.

That is, as shown in FIGS. 11 and 4A, the cooling air discharged from the opening 91b is:
Inlet opening 7 provided at one end of power supply unit 7
5 (path A2).

As shown in FIG. 4A, an intake fan 17 is provided in the intake opening 75. Route A
The cooling air guided along 2 is forcibly drawn into the power supply unit 7 by the intake fan 17, and cools the primary side active filter, power supply, ballast and the like inside the power supply unit 7.

Thereafter, the cooling air is exhausted from the exhaust opening 77 (not shown in FIG. 11) provided at the other end of the power supply unit 7 by the exhaust force of the exhaust fan 16 (path A3).

7-4. Cooling of illumination optical system 923 Further, cooling of the illumination optical system 923 will be described. As shown in FIG. 8, the lower light guide 901 has an opening 9
07 and 908 are formed. The illumination optical system 923 is
The air in the apparatus is cooled by taking in air from the openings 907 and 908. The air inside the device is exhaust fan 1
6 (see FIG. 4). The air in the apparatus naturally taken into the openings 907 and 908 by the exhaust force of the exhaust fan 16 is used as cooling air for the illumination optical system. The air that has cooled the illumination optical system is guided by an exhaust force of the exhaust fan 16 to an opening 9021 provided in the upper light guide 902 and discharged therefrom (path A shown in FIG. 4A and FIG. 11).
4).

7-5. Cooling of the light source lamp unit 8 The air that has cooled the circuit boards 11 and 13, the power supply unit 7, and the illumination optical system 923 is used for cooling the light source lamp unit 8. This cooling path will be described with reference to FIGS.

The video board 1 along the above-described path A1
1. The air that has cooled the driver board 13 flows into the light source lamp unit 8 through an opening 9004 (see FIG. 8) provided in the lower light guide 902. Then, the air is guided along the surface of the reflector 806 opposite to the reflection surface 806 a by the exhaust force of the exhaust fan 16, and is cooled. Thereafter, the air is exhausted from the notch 810 formed on the side of the lamp housing 802 by the exhaust force of the exhaust fan 16 (path A5).

On the other hand, the air that has cooled the power supply unit 7 along the path A3 flows into the light source lamp unit 8 via the opening 9004 (see FIG. 8) provided in the lower light guide 902. Further, the light is guided along the reflecting surface of the reflector 806 through a vent 808 formed in the lamp housing 802 and a vent 803 formed in the reflector 806, and cools the lamp body 805 (path A6). Here, as described above with reference to FIG. 6 in the description of the light source lamp unit 8, the flow straightening plate 841 is provided at the entrance of the ventilation port 808, thereby changing the direction of air flow. . The cooling air is supplied to the lamp body 80.
Guided to hit 5 directly. Therefore, the lamp body 805, which is the largest heat source in the apparatus, can be efficiently cooled.

Further, along the path A4, the illumination optical system 92
3 is also discharged from the opening 9021 shown in FIG.
And flows into the light source lamp unit 8 via this. Then, the lamp body 805 is cooled along the path A6.

The air that has cooled the lamp body 805 along the path A6 passes through the vent 804 formed in the reflector 806 by the exhaust force of the exhaust fan 16, and is discharged from the vent 809 formed in the lamp housing 802. (Path A6).

7-6. Exhaust Structure The air exhausted from the light source lamp unit 8 is exhausted from the exhaust port 160 by the exhaust fan 16 as shown in FIG.

Here, as can be seen from FIG. 5A, a light-shielding plate 161 is provided inside the exhaust port 160 as light-shielding means for shielding light leaking therefrom.

Although the detailed structure of the light-shielding plate 161 is not shown in the figure, it is a louver-like member formed by partially overlapping two plate-like members straddling the exhaust port 160. The two overlapping parts are arranged so as to correspond to the notches 810 of the lamp reflector 806. In addition, since the exhaust is performed from the gap between the two plate-shaped members, the exhaust is not hindered.

8. Temperature monitoring The temperatures of the light source lamp unit 8 and the three light valves 925R, 925G, and 925B are measured by an internal temperature detecting unit S1 provided above the light source lamp unit 8 and a prism unit 910, as shown in FIG. Temperature detection means S2 provided on video board 11 above
And an external temperature detecting means S3 provided near the intake opening 75 of the power supply unit 7. Light source lamp unit 8 and light valve 925 which are relatively weak to heat
This is to prevent excessive temperature rise of R, 925G, and 925B.

The internal temperature detecting means S1 detects the temperature of the light source lamp unit 8 and operates independently. If an unnatural temperature rise is detected in the light source lamp unit 8 during use of the projection display device 1, a warning sound is emitted (warning temperature). If the temperature rise does not stop and an abnormal state continues, the lamp body 805 is turned off (abnormal temperature).

The external temperature detecting means S3 is connected to the power supply unit 7
Is to detect the temperature near the intake opening 75 of
The temperature of the cooling air entering from the gap between the outer case 2 and the projection lens unit 6 and the temperature of the cooling air entering from the above-described opening 91b are detected. The external temperature detecting means S3 is provided at such a position in consideration of the fact that the cooling air is substantially equal to the external air temperature.

The internal temperature detecting means S2 detects the temperature of the cooling air after cooling the three light valves 925R, 925G, and 925B and the prism unit 910, and thereby detects the light valves 925R, 925G, and 925B.
It is provided to detect a rise in temperature of the device. The reason why the temperature rise of the light valves 925R, 925G, and 925B is detected by detecting the temperature of the air after cooling is as follows.
In the actual use state, the light valves 925R, 925
This is because the actual temperature of G, 925B cannot be measured by a contact-type temperature sensor.

Light valves 925R, 925G, 925
The cooling control of B is performed according to the temperature difference Δt detected by the internal temperature detecting means S2 and the external temperature detecting means S3 described above. Note that the cooling control here refers to control of controlling the amount of air blown by fans provided in the device such as the exhaust fan 16 and the intake fan 24, and turning off the lamp body 805 of the light source lamp unit 8 having a large heat value. Etc. The reason why the cooling control of the light valves 925R, 925G, and 925B is performed in accordance with the difference between the temperatures detected by the internal temperature detecting means S2 and the external temperature detecting means S3 is that the actual light valve depends on the external temperature. 9
This is because a change in the difference between the temperatures of 25R, 925G, and 925B and the temperature detected by the internal temperature detecting means S2 is considered.

More specifically, as shown in FIG. 12, the control is performed using a lower limit graph G1 of the warning temperature and a lower limit graph G2 of the abnormal temperature, and in the region below the graph G1, the light valves 925R, 925G, 925B indicates that it is in a normal state. If it is in an area between the graphs G1 and G2, a warning is given by a buzzer. In the case of an area above the graph G2, the light valves 925R, 925G, and 925B are in an abnormal state. If so, the lamp body 805 of the light source lamp unit 8 is turned off.

The equations of the graphs G1 and G2 are as follows.
It is derived by the following equation.

Graph G1 Δt (° C.) = A × outside temperature (° C.) + B (° C.) Graph G2 Δt (° C.) = C × outside temperature (° C.) + D (° C.) Y intercept B, D, slope A, C, etc. Since the specific numerical value varies depending on the structural arrangement of the projection display device 1, it can be obtained by the following procedure.

First, when the external temperature, that is, the temperature detected by the external temperature detecting means S3 is 0 ° C., the cooling air detected by the internal temperature detecting means S2 when the light valve reaches the practical temperature limit. The temperature D and the temperature B of the cooling air detected by the internal temperature detecting means S2 when the light valve reaches the temperature at which a warning is to be issued are measured. By this measurement, the Y intercepts B and D of the graphs G1 and G2 are obtained.

Next, when the predetermined external temperature, that is, the temperature detected by the internal temperature detecting means S3 is T ° C., when the light valve reaches the practical temperature limit, and when the temperature at which a warning is to be issued is reached. Then, the temperatures T2 and T1 of the cooling air detected by the internal temperature detecting means S2 are measured. Further, from these measured values, the value D1 (= T2−T) of Δt when the light valve reaches the practical temperature limit is obtained.
And the value B of Δt when the light valve reaches the warning temperature.
1 (= T1-T) is obtained.

The gradients A and C of the graphs G 1 and G 2 are calculated from the values obtained by the above procedure.

9. Effects of the Embodiment According to the projection display device 1 according to the present embodiment as described above, as described below, the cooling air intake 24
By efficiently circulating the cooling air taken in from zero, it is possible to increase the cooling efficiency while arranging various components at high density and reducing the size.

That is, since the air intake 240 is formed below the prism unit 910, the cooling air taken in from the outside first receives the prism unit 910 and the light valves 925R, 925G, 925.
Cool B. A space 911 surrounded by the air intake 240, the vertical wall 91 of the head plate 903, the lower light guide 910, and the duct 926 is formed around the prism unit 901, so that the cooling air is guided to the upper portion without leakage. be able to. Note that light valves 925R, 925G, and 925 constituting a modulation system are provided in the space 911.
B is arranged, so that the light valves 925R, 92
It is not necessary to provide a separate cooling mechanism for cooling 5G and 925B, and the cooling mechanism can be simplified.

After cooling them, the cooling air flows along the higher-temperature circuit boards 11 and 13 to cool them.

On the other hand, the power supply unit 7 is
And the exhaust opening 77, the interior can be efficiently cooled independently of the other parts. Further, since the intake fan 17 is provided in the intake opening 75 of the power supply unit 7, the heat sink inside the power supply unit 7 can be forcibly cooled, and the cooling efficiency of each element in the power supply unit 7 can be reduced. It can be further improved.

Further, the illumination optical system 923 can be cooled by the openings 907 and 908 formed in the light guide 100.

Since the light source lamp unit 8 is arranged at the position closest to the exhaust port 160, the prism unit 910, the light valves 925R, 925G, 9
The air for cooling the 25B, the circuit boards 11 and 13, the inside of the power supply unit 7, and the illumination optical system 923 can be used for cooling the light source lamp unit 8. Here, the lamp housing 802 constituting the light source lamp unit 8 includes:
Vent holes 808 and 809 are provided, while vent holes 803 and 804 are also formed on the left and right side surfaces of the reflector 806. And these ventilation holes 808, 809, 80
Since the cooling air is supplied to the lamp body 805 by 3, 804, the cooling efficiency of the light source lamp unit 8 can be promoted. Furthermore, the cooling efficiency can be further improved by the current plate 820 provided at the entrance of the ventilation hole 808.

As described above, in the projection display device 1 of the present embodiment, at least the prism unit 910, the power supply unit 7, and the light source lamp unit 8 can be cooled by the cooling air taken in from the air intake 240. Even when each component is arranged in a narrow area, it can be cooled efficiently.

Further, the prism unit 910, the light valves 925R, 925G, 925B, the circuit board 11,
13, the power supply unit 7, the illumination optical system 923, and the light source lamp unit 8 are cooled in order from a relatively low temperature portion, so that the cooling efficiency is further improved.

Furthermore, in the projection type display device 1 of the present embodiment, the exhaust port 160 is provided at the rear end of the device, and the exhaust is not normally exhausted from the side of the device where the user is located. Therefore, it is easy to use because hot air does not hit the user and light leaking from the inside of the apparatus is hard to see.

Further, since the exhaust port 160 formed near the light source lamp unit 8 is provided with the light shielding plate 161 inside, the light of the light source lamp unit 8 hardly leaks from the exhaust port 160 during use. Further, the light shielding plate 161
Is louver-shaped, and does not hinder exhaust from the exhaust port 160.

Also, light valves 925R, 925G,
925B is controlled by the difference between the temperatures detected by the internal temperature detecting means S2 and the external temperature detecting means S3.
Since the control is performed according to the temperature difference between the external temperature and the internal temperature, appropriate cooling control can be performed.

Note that the present invention is not limited to the above-described embodiment, but includes the following modifications.

That is, in the above-described embodiment, the power supply unit 7 is cooled by the air taken in from the air inlet 240 and the air entering through the gap between the projection lens unit 6 and the outer case 2. However, even if only one of them is taken in, the same effect as in the above-described embodiment can be enjoyed.

The power supply unit 7 has an intake fan 1
7 was provided, and the cooling air was forcibly taken in.
The cooling air may be circulated in the power supply unit 7 by using the exhaust power of the exhaust fan 16 provided in the exhaust port 160. Further, an exhaust fan is provided in the exhaust opening 77 to force the cooling air. May be distributed.

Further, the cooling control according to the temperature difference between the external temperature and the internal temperature is performed by the light valves 925R, 925.
The present invention can be applied not only to G and 925B but also to cooling control in the apparatus in general.

In addition, specific structures, shapes, and the like when implementing the present invention may be other structures and the like as long as the object of the present invention can be achieved.

[0187]

According to the present invention as described above, in the projection display device containing the optical unit and the power supply unit, the power supply unit has the intake opening and the exhaust opening, so that other parts are provided. Independently from the above, the inside of the power supply unit can be efficiently cooled, the optical unit and the power supply unit can be densely arranged to reduce the size of the device, and the inside of the device can be cooled efficiently. it can.

[Brief description of the drawings]

FIG. 1 is a front view and a rear view illustrating a projection display device according to an embodiment of the present invention.

FIG. 2 is a top view and a bottom view in the embodiment described above.

FIG. 3 is a schematic perspective view showing an internal structure of a lower case portion of the outer case in the embodiment described above.

FIG. 4 is a horizontal sectional view illustrating an arrangement of an optical unit and a power supply unit and a structure of the optical unit in the above-described embodiment.

FIG. 5 is a vertical sectional view of a projection display device showing an arrangement structure of a circuit board in the above-described embodiment and a partial perspective view showing an exhaust port.

FIG. 6 is a schematic perspective view and a horizontal cross-sectional view illustrating a structure of a light source lamp unit in the embodiment.

FIG. 7 is a horizontal cross-sectional view and a schematic perspective view illustrating a structure of a polarization conversion element included in the illumination optical system according to the above-described embodiment.

FIG. 8 is a schematic perspective view illustrating a structure of a light guide that houses an optical unit according to the above-described embodiment.

FIG. 9 is a schematic perspective view illustrating a structure of a head plate supporting a prism unit serving as a color combining optical system in the above-described embodiment.

FIG. 10 is a vertical cross-sectional view illustrating a structure of a duct of an air intake in the embodiment.

FIG. 11 is a schematic perspective view illustrating a cooling structure of an optical unit, a power supply unit, and a circuit board in the above-described embodiment.

FIG. 12 is a graph showing a control range of temperature monitoring by an internal temperature sensor and an outside air temperature sensor in the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Projection display apparatus 2 Exterior case 6 Projection lens unit 7 Power supply unit 8 Light source lamp unit 10 Optical unit 11, 13 Circuit board 17 Intake fan 75 Intake opening 77 Exhaust opening 100 Light guide 240 Air intake 926 Duct 160 Exhaust port 241 Air filter 808, 809 Vent 820 Rectifier 907, 908 Opening 910 Color synthesis optical system (prism unit) 923 Illumination optical system 924 Color separation optical system 925R, 925G, 925B Modulation system (light valve) 161 Light shield plate (light shield) Means) R Red light beam G Green light beam B Blue light beam S1, S2 Internal temperature detecting means S3 Outside air temperature detecting means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor St. Miyashita 3-3-5 Yamato, Suwa City, Nagano Prefecture Inside Seiko Epson Corporation (72) Inventor Mutsuya Furuhata 3-5-5 Yamato, Suwa City, Nagano Prefecture Seiko Epson Inside (72) Inventor Takeshi Takizawa 3-3-5 Yamato, Suwa-shi, Nagano Prefecture Seiko Epson Corporation

Claims (14)

[Claims] An optical unit for optically processing a light beam emitted from a light source lamp unit and enlarging and projecting an image on a projection surface by a projection lens unit, and a power supply for supplying power to the optical unit and the light source lamp unit A projection display device comprising: a unit; and an outer case for housing the optical unit and the power supply unit, wherein the outer case has an air intake for taking in cooling air from outside the device, and air inside the device. And an exhaust port for discharging air to the outside, one end of the power supply unit is disposed near the air intake port, and the one end has an intake for taking cooling air into the power supply unit. An opening for exhausting air inside the power supply unit is provided at the other end of the power supply unit, The light source lamp unit is provided between an exhaust opening formed in the outer case and an exhaust opening provided at another end of the power supply unit, and is provided between the exhaust opening formed at the other end. The projected display device, wherein the discharged air flows inside the light source lamp unit and is used as cooling air for the light source lamp unit. 2. The projection display device according to claim 1, wherein an intake fan is provided in the intake opening. 3. The projection type display device according to claim 1, wherein the exhaust port is provided with a light shielding means for covering the exhaust port from the inside. 4. The projection type display device according to claim 3, wherein the light-shielding means is a louver-shaped light-shielding means formed by stacking a plurality of plate-like materials having a length dimension spanning the exhaust port. A projection display device characterized by the above-mentioned. 5. The projection type display device according to claim 1, wherein said light source lamp unit comprises a light source lamp comprising a lamp body and a reflector, and a box-shaped lamp for accommodating said light source lamp. A projection type display device comprising: a housing; and a ventilation hole that guides the cooling air to the lamp body is formed on a side surface of the lamp housing substantially orthogonal to an opening surface of the reflector. 6. The projection display device according to claim 5, wherein a rectifying plate for guiding the cooling air to the lamp body is provided in the ventilation hole. 7. The projection display according to claim 1, wherein the optical unit is configured to separate the light beam into light beams of a plurality of colors, and each of the separated light beams. A modulation system that modulates based on the image information and emits a modulated light beam, and a color combining optical system that combines each of the modulated light beams and emits the light to the projection lens unit. A projection display device formed below a color combining optical system. 8. The projection display device according to claim 7, wherein a circuit board for controlling the optical unit is provided above the optical unit, and the cooling air taken in from the air intake is: A projection display device, wherein a part is collected on an upper part of the color synthesizing optical system, circulates along the circuit board, and is discharged from the exhaust port. 9. The projection type display device according to claim 7, wherein dustproof means is provided above said color combining optical system. 10. An optical unit for optically processing a light beam emitted from a light source lamp unit and enlarging and projecting an image on a projection surface by a projection lens unit, and supplying power to the optical unit and the light source lamp unit. A projection display device comprising an L-shaped power supply unit and an outer case for housing the optical unit and the power supply unit, wherein the outer case has an air intake for taking in cooling air from outside the device. The power supply unit is formed on a side of the optical unit, and one end of the power supply unit is disposed near the projection lens unit. 11. The projection display device according to claim 10, wherein the one end of the power supply unit is arranged near the air intake, and the one end of the power supply unit has An intake opening for taking in the cooling air is provided in the power supply unit, and an exhaust opening for discharging air in the power supply unit is provided at the other end of the power supply unit. Projection type display device. 12. The projection display device according to claim 11, wherein the light source lamp unit has an exhaust port formed in the outer case and an exhaust opening provided at the other end of the power supply unit. A projection display device, wherein the projection display device is disposed between the display devices. 13. A projection display apparatus comprising: a light source lamp unit; and an optical unit that optically processes a light beam emitted from the light source lamp unit and enlarges and projects an image on a projection surface by a projection lens unit. An internal temperature detecting means for detecting an internal temperature of the apparatus, an external temperature detecting means for detecting a temperature outside the apparatus, an internal temperature detected by the internal temperature detecting means, and an external temperature detecting means A cooling control of the projection-type display device is performed in accordance with a temperature difference from an external temperature detected by the projection-type display device. 14. The projection display device according to claim 13, further comprising an outer case for housing the light source lamp unit and the optical unit, wherein the outer case has an air intake for taking in cooling air from outside the device. Is formed, and the external temperature detected by the external temperature detecting means is a temperature of air taken in from the air inlet.