JP2000194071A - Projection display device - Google Patents

Abstract

(57) [PROBLEMS] To provide a projection display device capable of efficiently cooling an electro-optical device, easily reducing the size of the device and increasing the brightness of a light source device. A plurality of light modulation devices (925R, 925G, 9) are provided.
The projection type display device provided with an intake fan 17C for guiding the outside air as cooling air into the inside of the device has a main pipe 811 whose end opening is connected to the intake fan 17C, and a branch from the main pipe 811. , The end opening is a light modulation device 925
R, 925G, branch pipe 81 arranged on the side of 925B
2R, 812G, and 812B are provided, and the cooling air introduction pipe 81 includes:
The configuration is such that the amount of cooling air introduced is proportionally distributed according to the amount of heat generated by each of the light modulators 925R, 925G, and 925B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source, an electro-optical device for forming an optical image from a light beam emitted from the light source in accordance with image information, and an enlarged projection of an image formed by the electro-optical device. The present invention relates to a projection display device including a projection lens and an intake fan that guides external air as cooling air into the device.

[0002]

2. Description of the Related Art Conventionally, a light source, an electro-optical device for forming an optical image of a light beam emitted from the light source in accordance with image information, and a projection lens for enlarging and projecting an image formed by the electro-optical device are known. 2. Description of the Related Art There is known a projection display device provided with such a device.

[0003] Such a projection display device is widely used for multimedia presentations at conferences, conferences, exhibitions and the like.

[0004]

The projection display device is sometimes maintained in a state where it is installed in a conference room or the like for a presentation. May be transferred to and stored. Therefore, miniaturization of the projection display device has been promoted for easy carrying.

Further, in order to improve the visibility of the display screen by the projection display device, the light source device has been promoted to have higher luminance.

In such a projection type display device in which the miniaturization and the increase in the luminance of the light source device have been promoted, the components inside the device have become dense due to the miniaturization and the temperature inside the device has increased due to the increase in the luminance. From the viewpoint, how to efficiently cool the inside of the projection display device becomes a problem. In particular, an electro-optical device that forms a light image emitted from a light source in accordance with image information includes a liquid crystal panel using polysilicon as a switching element, and it is important to efficiently cool the liquid crystal panel. It is a problem.

An object of the present invention is to provide a projection display device which can efficiently cool an electro-optical device, reduce the size of the device, and easily increase the brightness of a light source device.

[0008]

According to the present invention, there is provided a projection display apparatus comprising a light source, an electro-optical device for forming a light beam emitted from the light source in accordance with image information, and an electro-optical device. A projection type display device including a projection lens for enlarging and projecting the formed image and an intake fan for guiding external air into the device as cooling air, one end opening of which is connected to the intake fan, A cooling air introduction pipe whose other end is disposed on a side of the electro-optical device is provided.

According to the present invention, since the cooling air introduction pipe is provided, the cooling air taken in from the intake fan is supplied to the electro-optical device through the cooling air introduction pipe, and Cooling can be performed efficiently, and the size of the projection display device can be reduced, and the brightness of the light source device constituting the projection display device can be easily increased.

In the above description, when the electro-optical device includes a plurality of light modulation devices, the cooling air introduction pipe is set according to the main pipe connected to the intake fan and the number of light modulation devices. A plurality of branch pipes branched from the main pipe, an end opening of the main pipe is connected to an intake fan, and each end opening of the plurality of branch pipes is connected to a side of each of the plurality of light modulation devices. Preferably, the cooling air flowing through the plurality of branch pipes is proportionally distributed according to the calorific value of each light modulation device.

Specifically, the electro-optical device is red, green,
In the case of having three light modulators for modulating the blue light flux respectively, a main pipe whose end opening is connected to an intake fan,
A cooling air introduction pipe having three branch pipes branched from the main pipe can be adopted. Of the three light modulators, the light modulator that modulates the blue light flux has the largest heat value, then the light modulator that modulates the green light beam and the light modulator that modulates the red light beam have the smaller heat value. Has become. Therefore, the cooling air maximizes the amount of the branch pipe that supplies the light modulator that modulates the blue light flux, and then the branch pipe that supplies the light modulator that modulates the green light flux, and the light modulator that modulates the red light flux. The amount of introduction may be set smaller in the order of the branch pipes supplied to the pipes.

In other words, since the amount of cooling air introduced by the cooling air introduction pipe is proportionally distributed according to the amount of heat generated by the plurality of light modulators, the amount of cooling air introduced is adjusted according to the amount of heat generated by the light modulator. This makes it possible to cool each light modulation device more efficiently.

Further, in order to apportion the amount of cooling air introduced,
Either adopt a cooling air introduction pipe provided with a branch pipe having a cross section whose opening area is set according to the heat generation amount of each light modulation device arranged on the side, or connect a main pipe with a plurality of branch pipes In addition, a cooling air introduction pipe provided with a rectifying plate for guiding cooling air to each of the plurality of branch pipes according to the heat values of the plurality of light modulation devices can be adopted.

That is, if the opening area of each branch pipe is set in accordance with the amount of heat generated by the light modulator, a cooling air introduction pipe capable of apportioning cooling air simply by selecting a branch pipe connected to the main pipe. Therefore, the structure of the cooling air introduction pipe can be simplified. In addition, if a rectifying plate for proportionally distributing the cooling air is provided at the connection between the main pipe and the branch pipe, a cooling air introduction pipe capable of distributing the cooling air with a uniform diameter of a plurality of branch pipes can be configured. It is easy to arrange other components of the display device.

Further, it is preferable that each of the end openings of the plurality of branch pipes is configured to surround each of the light modulators arranged on the side in a plan view.

That is, since the end opening of the branch pipe is configured as described above, it is possible to uniformly cool each light modulation device, and the cooling efficiency is further improved.

Preferably, the above-mentioned intake fan is arranged at a position shifted from the electro-optical device in plan view.

That is, by arranging the cooling fan in this manner, the cooling fan is arranged so as to avoid the side of the electro-optical device, and it is easy to reduce the thickness of the projection display device.

It is preferable that the above-mentioned intake fan is disposed near the projection lens.

That is, since the projection lens has an optical adjustment mechanism such as zoom and focus, the projection lens becomes longer by that amount, and a dead space is easily generated in the vicinity of the projection lens. Therefore, if the intake fan is arranged near such a projection lens, the structure of the projection type display device can be made dense, and the size of the projection type display device can be further reduced.

Further, as the above-mentioned intake fan, it is preferable to employ a centrifugal fan for discharging air taken in by the rotation of the fan in a tangential direction of the rotation.

That is, since the centrifugal fan is employed as the intake fan, the discharge pressure of the cooling air can be increased, and the cooling air can be reliably sent to the electro-optical device even if the cooling air introduction pipe is somewhat longer. be able to. Also,
Since the centrifugal fan has a higher discharge pressure than a normal axial fan, a sufficient discharge pressure can be secured even if the rotation speed of the fan is reduced. Noise can be reduced.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

(1) Overall Configuration of Apparatus FIGS. 1 and 2 are schematic perspective views of a projection display apparatus 1 according to the present embodiment. FIG. 1 is a perspective view as viewed from above, and FIG. It is the perspective view seen from the lower surface side.

The projection display device 1 separates a light beam emitted from a light source lamp as a light source into three primary colors of red (R), green (G), and blue (B), and separates the light beams of these colors into an electro-optical device. Modulation is performed through a liquid crystal panel according to image information in accordance with image information, and modulated light fluxes of the respective colors are combined by a prism (color combining optical system) and enlarged and displayed on a projection surface via a projection lens 6. Things. Projection lens 6
Except for a part, each component is housed inside the outer case 2.

(2) Structure of the Outer Case The outer case 2 is basically composed of an upper case 3 covering the upper surface of the device, a lower case 4 constituting the bottom surface of the device, and a rear case 5 covering the back surface portion (FIG. 2). It is composed of

As shown in FIG. 1, the upper case 3
A large number of communication holes 25R and 25L are formed at the left and right ends on the front side of the upper surface of the. An operation switch 60 for adjusting the image quality and the like of the projection display device 1 is provided between the communication holes 25R and 25L. Further, a light receiving unit 70 for receiving an optical signal from a remote controller (not shown) is provided in a lower left portion of the upper case 3 as viewed from the front.

As shown in FIG. 2, a lamp replacement cover 27 for replacing a light source lamp unit 8 (described later) housed in the lower case 4 is provided on the bottom surface of the lower case 4, and a lamp replacement cover 27 is provided on the front side of the device. An air inlet 240 for taking in cooling air for cooling the inside is provided.

As shown in FIG. 2, on the bottom surface of the lower case 4, a foot 31C is provided at a substantially central portion of a front end thereof, and feet 31R and 31L are provided at left and right corners of a rear end. . The foot 31C is connected to the lever 3 shown in FIG.
When the apparatus is pulled up, the apparatus is rotated by the rear rotation mechanism 312 (FIG. 2). When the apparatus is used, the front side is separated from the apparatus main body and urged in an open state. The vertical position of the display screen on the projection plane can be changed by adjusting the amount of rotation. on the other hand,
The feet 31R and 31L are configured to advance and retreat in the protruding direction by rotating, and the inclination of the display screen can be changed by adjusting the amount of advance and retreat.

As shown in FIG. 2, an AC inlet 50 for supplying external power and various input / output terminal groups 51 are arranged in the rear case 5. An exhaust port 160 for discharging the air is formed.

(3) Internal Structure of the Apparatus FIGS. 3 to 5 show the internal structure of the projection display apparatus 1. FIG. 3 and 4 are schematic perspective views of the inside of the device, and FIG. 5 is a vertical sectional view of the projection display device 1.

As shown in these figures, a power supply unit 7 as a power supply, a light source lamp unit 8, an optical unit 10 constituting an optical system, and a pair of upper and lower drivers as a modulation element driving board are provided inside the outer case 2. Board 11,
A main board 12 and the like as a control circuit board are arranged.

The power supply unit 7 includes first and second power supply blocks 7A and 7B arranged on both sides of the projection lens 6. The first power supply block 7A includes an AC inlet 5
0, which transforms the power obtained through the power supply 0 and supplies the transformed power mainly to the second power supply block 7B and the light source lamp unit 8. The power supply circuit includes a transformer (transformer), a rectifier circuit, a smoothing circuit, a voltage stabilizing circuit, and the like. In addition to the substrate, a lamp driving substrate 18 for driving a light source lamp 181 described later of the light source lamp unit 8 is provided. The lamp driving substrate 18 is covered with a transparent resin cover 185. The second power supply block 7B further transforms and supplies the power obtained from the first power supply block 7B. Like the first power supply block 7A, the second power supply block 7B includes a power supply circuit board on which various circuits are formed in addition to a transformer. Have. The power is supplied to another power supply circuit board 13 (shown by a dotted line in FIG. 4) disposed below the optical unit 10 and the first and second intake fans 17A disposed adjacent to the power supply blocks 7A and 7B. , 17B. In the power supply circuit on the power supply circuit board 13, the power for driving the control circuit on the main board 12 is mainly generated based on the power from the second power supply block 7B, and the power for the other low power components is provided. It is producing electricity. Here, the second intake fan 17B is disposed between the second power supply block 7B and the projection lens 6, and cools through a gap formed between the projection lens 6 and the upper case 3 (FIG. 1). It is provided so that air is sucked into the inside from the outside. And each power supply block 7A,
7B is a conductive cover member 250 made of aluminum or the like.
A, 250B, each cover member 250A, 250B
Are provided with speakers 251R and 251L for audio output at positions corresponding to the communication holes 25R and 25L of the upper case 3. These cover members 250A, 250
B, as shown in FIG. 6, the upper portion is mechanically and electrically connected by a conductive metal plate 252U, and the lower portion is electrically connected by a metal plate 252L (shown by a dotted line in FIG. 2). And finally G of inlet 50
Grounded through an ND (ground) line. Of these metal plates 252U and 252L, the metal plate 252L is fixed in advance to the lower case 4 made of resin, and both ends of each of the power supply blocks 7 are provided.
By assembling the lower case 4 and the lower case 4A, the lower case 4 comes into contact with the lower surfaces of the cover members 250A and 250B, and conducts each other.

The light source lamp unit 8 constitutes a light source part of the projection display device 1 and includes a light source lamp 181.
And a light source device 183 including a reflector 182 and a lamp housing 184 that accommodates the light source device 183. Such a light source lamp unit 8 is covered with an accommodating portion 9021 formed integrally with the lower light guide 902 (FIG. 5), and is configured so that the above-described lamp replacement lid 27 can be opened and removed. Accommodation unit 902
1, a pair of exhaust fans 16 are provided side by side at a position corresponding to the exhaust port 160 of the rear case 5,
As will be described later in detail, the cooling air sucked by the first and second intake fans 17A and 17B by the exhaust fan 16 is introduced into the inside from the opening provided near the accommodation portion 9021, and the cooling air After cooling the light source lamp unit 8 with air, the cooling air is discharged to the exhaust port 1.
Exhaust from 60. The power of each exhaust fan 16 is supplied from the power supply circuit board 13.

The optical unit 10 is a unit for optically processing a light beam emitted from the light source lamp unit 8 to form an optical image corresponding to image information. The illumination optical system 923, the color separation optical system 924, It is configured to include an electro-optical device 925 and a prism unit 910 as a color combining optical system. Optical elements of the optical unit 10 other than the electro-optical device 925 and the prism unit 910 include:
The light guide 901 and the light guide 902 are vertically held between the light guides 901 and 902. The upper light guide 901 and the lower light guide 902 are integrated and fixed to the lower case 4 side with fixing screws. These light guides 901 and 902 are similarly fixed to the prism unit 910 side by fixing screws.

The prism unit 910 having a rectangular parallelepiped shape is fixed to a back surface of a head body 903 which is a substantially L-shaped structure formed from an integrally molded product of magnesium with a fixing screw. Further, each of the liquid crystal panels 925R, 925G, and 9 as a light modulation device constituting the electro-optical device 925
25B is fixed to three side surfaces of the prism unit 910 via fixing members. As shown in FIG. 5, a cooling air introduction pipe 81 is provided on the lower surface of the head body 903, and the cooling air flowing through the cooling air introduction pipe 81 cools the liquid crystal panels 925R, 925G, and 925B ( See below). The driver board 11 includes the liquid crystal panels 925R, 925G, and 9 of the electro-optical device 925 described above.
25B is for driving and controlling 25B, and is disposed above the optical unit 10. The lower driver board 11A and the upper driver board 11B are separated from each other via stud bolts 9011, and many elements (not shown) forming a driving circuit and the like are mounted on opposing surfaces of each other.

The main board 12 is provided with a control circuit for controlling the whole of the projection display device 1, and is provided upright beside the optical unit 10. Such a main board 12 is electrically connected to the driver board 11 and the operation switch 60, and further includes an input / output terminal group 5
1 is electrically connected to the interface board 14 and the video board 15 provided with the power supply circuit 1, and is connected to the power supply circuit board 13 via a connector or the like. The control circuit of the main board 12 is driven by power generated by the power supply circuit on the power supply circuit board 13, that is, power from the second power supply block 7B. The main board 12 is cooled by the second intake fan 17B from the second intake fan 17B.
This is performed by cooling air flowing through the power supply block 7B.

In FIG. 3, a guard member 19 made of metal such as aluminum is disposed between the main board 12 and the outer case 2 (only the lower case 4 and the rear case 5 are shown in FIG. 3). The guard member 19 has a large planar portion 191 extending over the upper and lower ends of the main board 12, the upper side is fixed to the cover member 250 </ b> B of the second power supply block 7 </ b> A with fixing screws 192, and the lower end is formed of the lower case 4. For example, the upper case 3 is engaged and supported by a slit. As a result, when the upper case 3 is attached to the lower case 4, interference between the upper case 3 (FIG. 1) and the main board 12 is prevented, and the main board 12 is protected from external noise. I have.

(4) Structure of Optical System Next, the optical system of the projection display device 1, that is, the optical unit 10
Will be described with reference to the schematic diagram shown in FIG.

As described above, the optical unit 10 includes the illumination optical system 923 for uniformizing the in-plane illuminance distribution of the light beam (W) from the light source lamp unit 8, and the illumination optical system 923.
A color separation optical system 924 that separates a light beam (W) from light into red (R), green (G), and blue (B), and an electro-optical device that modulates each of the light beams R, G, and B according to image information. 925, and a prism unit 910 as a color synthesizing optical system for synthesizing each color light beam after modulation.

The illumination optical system 923 includes a reflecting mirror 931 that bends the optical axis 1a of the light beam W emitted from the light source lamp unit 8 toward the front of the apparatus, and a first lens plate 921 that is disposed with the reflecting mirror 931 interposed therebetween. And a second lens plate 922. The first lens plate 921 is
It has a plurality of rectangular lenses arranged in a matrix, divides a light beam emitted from the light source into a plurality of partial light beams, and condenses each of the partial light beams near the second lens plate 922.

The second lens plate 922 has a plurality of rectangular lenses arranged in a matrix, and converts each partial light beam emitted from the first lens plate 921 into an electro-optical device 9.
25, 925R, 925G, 925
B (described later).

As described above, in the projection display apparatus 1 of the present embodiment, the liquid crystal panels 925R and 925R are controlled by the illumination optical system 923.
25G and 925B can be illuminated with light having substantially uniform illuminance, so that a projection image without illuminance unevenness can be obtained.

The color separation optical system 924 includes a blue-green reflecting dichroic mirror 941 and a green reflecting dichroic mirror 9.
42 and a reflection mirror 943. First, in the blue-green reflecting dichroic mirror 941, the blue light beam B included in the light beam W emitted from the illumination optical system 923 is used.
The green light flux G is reflected at a right angle, and travels toward the green reflection dichroic mirror 942.

The red light beam R passes through the blue-green reflecting dichroic mirror 941, is reflected at a right angle by the rear reflecting mirror 943, and is emitted from the emission unit 944 of the red light beam R to the prism unit 910 side. Next, of the blue and green luminous fluxes B and G reflected by the blue-green reflecting dichroic mirror 941, the green reflecting dichroic mirror 94
In 2, only the green light flux G is reflected at a right angle, and is emitted from the emission unit 945 of the green light flux G to the prism unit 910 side. The blue light flux B that has passed through the green reflection dichroic mirror 942 is emitted from the emission section 946 of the blue light flux B toward the relay optical system 927. In this example, the color separation optical system 92 is output from the emission portion of the light beam W of the illumination optical system 923.
4, the emission portions 944, 94 of the respective color light beams R, G, B.
The distances to 5,946 are all set to be equal.

The red and green luminous flux R of the color separation optical system 924,
Condensing lenses 951 and 952 are arranged on the emission sides of the G emission sections 944 and 945, respectively. Therefore, the red and green light fluxes R and G emitted from the respective emission portions are incident on these condenser lenses 951 and 952 and are parallelized.

The red and green luminous fluxes R and G thus collimated pass through the incident side polarizing plates 960R and 960G and enter the liquid crystal panels 925R and 925G as light modulators, and are modulated to correspond to the respective color lights. The added image information is added.
That is, these liquid crystal panels 925R and 925G
Switching control is performed by the above-described driver board 11 in accordance with image information, whereby each color light passing therethrough is modulated. On the other hand, the blue light flux B is guided to the corresponding liquid crystal panel 925B via the relay optical system 927, where it is similarly modulated according to image information. The liquid crystal panels 925R, 925 of the present embodiment
As the G and 925B, for example, those using a polysilicon TFT as a switching element can be adopted.

The relay optical system 927 includes a condenser lens 954 disposed on the exit side of the exit section 946 of the blue light beam B, an incident-side reflection mirror 971, an exit-side reflection mirror 972, and disposed between these reflection mirrors. Intermediate lens 973
Condensing lens 95 arranged on the front side of liquid crystal panel 925B
The blue light flux B emitted from the condenser lens 953 is incident on the liquid crystal panel 925B through the incident-side polarizing plate 960B and is modulated. At this time, the optical axis 1a of the light beam W and the optical axes 1r, 1g of the color light beams R, B, B,
1b is formed in the same plane. The length of the optical path of each color light beam, that is, the distance from the light source lamp 181 to each liquid crystal panel is the longest for the blue light beam B,
Therefore, the light amount loss of this light flux becomes the largest. But,
By interposing the relay optical system 927, loss of light quantity can be suppressed.

Next, each of the liquid crystal panels 925R, 925G,
The color light beams R, G, and B modulated through 925B are incident on the prism unit 910 through the output-side polarizing plates 961R, 961G, and 961B, and are combined there. The color image synthesized by the prism unit 910 is enlarged and projected on the projection surface 100 at a predetermined position via the projection lens 6.

(5) Cooling Structure of Electro-Optical Device 925 The projection-type display device 1 having the electro-optical device 925 having the above-described structure has a dedicated cooling structure for efficiently cooling the electro-optical device 925. Is provided. As shown in FIG. 7, the cooling structure includes an intake fan 17C disposed below the projection lens 6 and corresponding to the position of the air intake 240, and cooling air taken in by the intake fan 17C. And a cooling air introduction pipe 81 to be sent to the side of the liquid crystal panels 925R, 925G, 925B constituting the electro-optical device 925.

The intake fan 17C is constituted by a centrifugal fan for discharging air taken in by the rotation of the fan in a tangential direction of rotation, and a cooling air introduction pipe 81 is connected to a portion for discharging the air. In the case of the present embodiment, the maximum flow rate of the intake fan 17C is 0.17 m.
^Although a centrifugal fan with ³ / min and a maximum static pressure at the discharge port of 17.5 mmAq is adopted, it can be changed as appropriate according to the calorific value of the electro-optical device 925, the path of the cooling air introduction pipe 81, and the like. The intake fan 17C receives power from the power supply circuit board 13 in the same manner as the other intake fans 17A and 17B.

As shown in FIG. 8, the cooling air introduction pipe 81 connected to the outlet of the intake fan 17C has a main pipe 811 having an end opening connected to the exhaust port of the intake fan 17C. Liquid crystal panels 925R, 925G,
925B, and has three branch pipes 812R, 812G, and 812B that branch off from the main pipe 811. The end opening of the branch tube 812R is arranged on the side of the liquid crystal panel 925R that modulates the red light beam, and the branch tube 81
The 2G end opening is a liquid crystal panel 92 that modulates green light flux.
The end opening of the branch pipe 812B is disposed on the side of 5G,
It is arranged on the side of the liquid crystal panel 925B that modulates blue light.

The cross section of the branch pipe 812R, the branch pipe 812G, and the branch pipe 812B has the opening area of the liquid crystal panel 925.
R, 925G, 925B, and polarizing plates 960R, 960G, 960B, 961R, 9 disposed on the entrance / exit surface side.
It is set in accordance with the heat values of 61G and 961B. More specifically, the liquid crystal panel 925B that modulates the blue luminous flux having the highest energy, and the polarizers 960B and 961B disposed on the input and output surfaces thereof generate the most heat, and the liquid crystal panel 925G that modulates the green luminous flux and the input and output surfaces thereof Plates 960G and 961G arranged on the side, a liquid crystal panel 925R for modulating a red light beam, and a polarizing plate 96 arranged on the entrance / exit surface side thereof.
Since the calorific value decreases in the order of 0R and 961R, the diameter of the branch pipe 812B is made the largest to secure a large opening area,
The diameter is reduced in the order of the branch pipe 812G and the branch pipe 812R.

Each branch pipe 812R, 812G, 81
The end openings of 2B are provided on the mounting surface of the prism unit 910 of the head body 903 on the liquid crystal panels 925R, 925G, 9G.
Cooling air inlet 903 formed according to the arrangement of 25B
R, 903G, and 903B, and each end opening is configured to surround each of the liquid crystal panels 925R, 925G, and 925B in plan view.

(6) Description of Cooling Channel Next, the cooling channel formed in the projection display 1 will be described.

In the projection display device 1, FIGS.
As shown schematically by arrows in FIG. 1, a first power supply block cooling flow path 41, a second power supply block cooling flow path 42, an electro-optical device cooling flow path 43, and a light source cooling flow path 44 are mainly formed. However, the cooling air flowing through each of the cooling passages 41 to 44 does not strictly flow along the arrows in the drawing, but is sucked and discharged generally as shown by the arrows through the gaps between the components. .

The first power supply block cooling passage 41 is a passage for cooling air sucked from the intake port 171 by the first intake fan 17A (FIGS. 3 and 4). The cooling air is
After cooling the first power supply block 7A, the lamp drive board 18 disposed behind the first power supply block 7A is cooled. At this time, the flow of the cooling air is restricted in one direction by flowing through the resin cover 185 having the front and rear ends opened so that the flow rate for cooling the lamp driving board 18 is reliably maintained. Has become. Thereafter, the cooling air is supplied to the storage section 90.
21, and flows into the housing portion 9021 through another opening (not shown), a gap, or the like, and cools the light source lamp unit 8 (light source lamp 181) disposed therein. Then, the air is exhausted from the exhaust port 160 by the exhaust fan 16.

The second power supply block cooling passage 42 is a passage for the cooling air sucked by the second intake fan 17B. After cooling the second power supply block 7B, the cooling air cools the main board 12 disposed behind the second power supply block 7B, and further flows into the inside of the light source lamp unit 8 through the opening 9023 and the like near the accommodation portion 9021. Is cooled and exhausted from the exhaust port 160 by the exhaust fan 16.

The cooling passage 43 for the electro-optical device is shown in FIGS.
Are the flow paths of the cooling air sucked by the intake fan 17C shown in FIG. As described above, the cooling air is supplied to each of the branch pipes 812R, 812G, 8 via the cooling air introduction pipe 81.
12B is proportionally divided according to the opening area of the cross section of the
The liquid crystal panels 925R, 925G, and 925B are discharged from 3R, 903G, and 903B, and are cooled. The cooling air that has cooled each of the liquid crystal panels 925R, 925G, and 925B passes through an opening 904 of an upper light guide 901 provided thereabove, and the upper and lower driver boards 11A, 11A.
B and flow backward along the opposing surfaces of the driver boards 11A and 11B. That is, the cooling passage 43 for the electro-optical device is formed by the driver boards 11A and 11B.
Are formed, and the elements mounted on the opposing surface facing the electro-optical device cooling channel 43 are efficiently cooled. Then, the cooling air flows through the openings 9022 and 922.
In addition to 023 and the like, it flows into the housing portion 9021 through another opening 9024 to cool the light source lamp unit 8, and is similarly exhausted from the exhaust port 160.

The light source cooling passage 44 is a passage for cooling air sucked from the intake port 172 (FIG. 2) on the lower surface of the lower case 4. The cooling air is sucked by the exhaust fan 16, and after being sucked from the air inlet 172, flows into the interior of the housing 9021 through an opening or a gap provided on the lower surface of the housing portion 9021, and enters the illumination optical system. 923, the light source lamp unit 8 is cooled, and the exhaust port 16 is cooled.
Exhausted from zero.

The cooling air in each of the cooling passages 41 to 44 as described above is exhausted from the exhaust port 160 by each exhaust fan 16, and these exhaust fans 16 are controlled in accordance with the temperature state of the heating parts. ing. That is, a temperature sensor 9025 covered with a shrink tube or the like is provided in the vicinity of the opening 9022 on the side of the light source lamp unit 8 where the temperature tends to rise.
Is provided, and the lens plate 9 below the opening 9023 is provided.
22 (FIG. 4), the first and second power supply blocks 7A, 7
B, similar temperature sensors (not shown) are also provided in the vicinity of the liquid crystal panels 925R, 925G, and 925B, and these temperature sensors 9025 in each of the cooling channels 41 to 44 are provided.
Is output to the main board 12 via, for example, the power supply circuit board 13 or the like. And the main board 1
In step 2, this signal is electrically processed to detect the temperature of the heat-generating component or the cooling air. As a result, when it is determined that the temperature is high, both exhaust fans 16 are simultaneously driven to be more aggressive. When it is determined that the temperature is low, the control is performed such that only one exhaust fan 16 is driven to save power.

(7) Effects of the Embodiment According to the above-described embodiment, the following effects can be obtained.

That is, since the cooling air introducing pipe 81 is provided, the cooling air taken in from the intake fan 17C is supplied to the electro-optical device 925 through the cooling air introducing pipe 81, so that the electro-optical device 925 is efficiently operated. Can be cooled. Therefore, the electro-optical device 925 that is easily affected by heat is sufficiently cooled.
It is possible to easily reduce the size of the projection display device 1 and increase the brightness of the light source lamp 181.

Further, since the amount of cooling air introduced by the cooling air introduction pipe 81 is proportionally distributed by the branch pipes 812R, 812G, 812B, the liquid crystal panel 925B and the polarizing plates 960B, 961 for modulating the blue luminous flux generating a large amount of heat are provided.
B, and then the liquid crystal panel 925G and the polarizing plate 960G that modulate the green luminous flux.
961G, the liquid crystal panel 925R for modulating the red luminous flux, and the polarizers 960R and 961R, the amount of cooling air introduced can be changed in this order, and the liquid crystal panels 925R, 925G, 92
5B and polarizing plates 960R, 960G, 960B, 961
R, 961G and 961B can be cooled more efficiently.

Further, the amount of cooling air introduced into the cooling air introducing pipe 81 is proportionally divided into branch pipes 812R, 812G, 8B.
The main pipe 811 and the branch pipes 812R and 812 are formed by changing the opening area by changing the diameter of the main pipe 8B.
The structure of the cooling air introduction pipe 81 including G and 812B can be simplified.

Then, the branch pipes 812R, 812G, 81
Each end opening of 2B is a liquid crystal panel 925 in plan view.
R, 925G, and 925B are configured to surround each of the liquid crystal panels 925R, 925B in plan view.
G, 925B and the polarizing plate 9 disposed on the light incident / exit surface side thereof
60R, 960G, 960B, 961R, 961G, 9
61B is uniformly cooled by the cooling air discharged from the branch pipes 812R, 812G, and 812B, and the electro-optical device 925 and the polarizing plates 960R, 960G, and 960 are cooled.
B, 961R, 961G, and 961B further improve the cooling efficiency.

Further, the intake fan 17C is connected to the electro-optical device 9
Since the cooling fan 17 </ b> C is disposed at a position shifted from the plane 25 in a plan view, the cooling fan 17 </ b> C is disposed at a position away from the side of the electro-optical device 925, and the height of the projection display device 1 can be reduced. This is advantageous in reducing the thickness of the device.

Further, the intake fan 17C is connected to the projection lens 6
, The dead space generated in the vicinity of the projection lens 6 can be efficiently used, so that the structure of the projection display device 1 can be made denser and the projection display device 1 can be downsized. Is easier to achieve.

Since the centrifugal fan is used as the intake fan 17C, the discharge pressure of the cooling air can be increased. Even if the cooling air introduction pipe 81 is slightly longer, the cooling air is supplied to the electro-optical device 925. Can be sent reliably. In addition, since the centrifugal fan has a higher discharge pressure than a normal axial fan, it is possible to secure a sufficient discharge pressure even if the rotation speed of the fan is reduced. Noise can be reduced.

(8) Modification of Embodiment The present invention is not limited to the above-described embodiment, but includes the following modifications.

In the above-described embodiment, the intake fan 17C is arranged below the projection lens 6, and the cooling air is introduced from the air intake 240 provided in the lower case 4, but the invention is not limited to this. That is, as shown in FIGS. 9 and 10, the intake fan 17 </ b> C may be arranged on the side of the projection lens 6 and below the light guide including the upper light guide 901 and the lower light guide 902. In short, in consideration of the capacity of the intake fan 17C, the length of the cooling air introduction pipe 81, and the like, it is only necessary to appropriately determine where to place the intake fan 17C inside the projection display device.

By arranging the intake fan 17C as shown in FIG. 9, the intake fan 17C is arranged in the first power supply block cooling passage 41 in FIG. Cooling air can be taken in. Therefore, unlike the above-described embodiment, it is not necessary to separately form the air intake 240 on the bottom surface of the lower case 4, so that the structure of the outer case 2 of the projection display device 1 can be simplified.

In the above embodiment, the branch pipe 812
By changing the diameters of R, 812G, and 812B, the amount of cooling air introduced was proportionally distributed, but this is not a limitation. That is, a rectifying plate may be provided at a connection portion between the main pipe and the branch pipe constituting the cooling air introduction pipe so as to apportion the amount of cooling air introduced into the branch pipe. Specifically, if a straightening plate is provided for a plurality of branch pipes having the same diameter so as to cover a part of the opening of the cross section, the amount of cooling air introduced can be proportionally distributed. According to such a cooling air introducing pipe, even if the diameter of the branch pipe is made uniform, the cooling air can be apportioned appropriately by the rectifying plate, so that other components of the projection display device can be easily arranged.

Further, in the above-described embodiment, the electro-optical device 925 includes the TFT driven liquid crystal panels 925R and 925.
G, 925B, but is not limited to this.
The present invention may be applied to a projection display device including a light modulation device configured by another driving method such as N or STN.

In the above embodiment, the electro-optical device 925 includes three liquid crystal panels 925R, 925G, 92
5B, the present invention is not limited to this, and the present invention may be applied to a light modulation device including one or two liquid crystal panels.

In the above embodiment, the electro-optical device 9
Although the panel constituting the liquid crystal element 25 is composed of a liquid crystal element, the present invention may be applied to a projection display apparatus including a light modulation device composed of a plasma element other than a liquid crystal and a device using a micromirror. .

Further, the electro-optical device 925 in the above embodiment is of a type in which light fluxes R, G, and B are transmitted and modulated. However, the present invention is not limited to this. The present invention may be applied to a projection display device including a reflection-type light modulation device that emits light.

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

[0079]

According to the present invention as described above, since the cooling air introduction pipe is provided, the cooling air taken in from the intake fan is supplied to the electro-optical device through the cooling air introduction pipe, and The optical device can be efficiently cooled, and the size of the projection display device can be reduced, and the brightness of the light source device constituting the projection display device can be easily increased.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a projection display device according to an embodiment of the present invention as viewed from above.

FIG. 2 is an external perspective view of the projection display device according to the embodiment as viewed from below.

FIG. 3 is a perspective view illustrating an internal structure of the projection display device according to the embodiment.

FIG. 4 is a perspective view showing an optical system inside the projection display device in the embodiment.

FIG. 5 is a vertical sectional view of the projection display device in the embodiment.

FIG. 6 is a schematic diagram for explaining a structure of an optical system in the embodiment.

FIG. 7 is a partial perspective view illustrating a cooling structure of the electro-optical device according to the embodiment.

FIG. 8 is a plan view illustrating an arrangement of cooling air introduction pipes in the embodiment.

FIG. 9 is a partial perspective view for explaining a modification of the embodiment.

FIG. 10 is a partial perspective view for explaining another modification of the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Projection display apparatus 6 Projection lens 17C Intake fan 81 Cooling air introduction pipe 181 Light source lamp 811 Main pipe 812 Branch pipe 925 Electro-optical device 925R, 925G, 925B Liquid crystal panel (light modulation device)

Claims (8)

[Claims] A light source, an electro-optical device that forms an optical image of a light beam emitted from the light source in accordance with image information, a projection lens that enlarges and projects an image formed by the electro-optical device, and an external lens. A projection display device comprising: an intake fan that guides air into the device as cooling air, wherein one end opening is connected to the intake fan, and the other end opening is on a side of the electro-optical device. A projection type display device, wherein a cooling air introduction pipe to be arranged is provided. 2. The projection display device according to claim 1, wherein the electro-optical device includes a plurality of light modulators, and the cooling air introduction pipe is a main pipe connected to the intake fan. And a plurality of branch pipes that are set in accordance with the number of the light modulation devices and branch from the main pipe. An end opening of the main pipe is connected to the intake fan, and the plurality of branch pipes Each end opening is arranged on each side of the plurality of light modulators, and the cooling air flowing through the plurality of branch pipes is proportionally distributed according to the heat value of each light modulator. Projection display device. 3. The projection display device according to claim 2, wherein each of the plurality of branch tubes has a cross section in which an opening area is set in accordance with a calorific value of each of the light modulators arranged on the side. A projection display device, comprising: 4. The projection display device according to claim 2, wherein a connecting portion between the main pipe and the plurality of branch pipes is provided with a plurality of branch pipes in accordance with a heat value of the plurality of light modulation devices. Wherein a rectifying plate for guiding cooling air is provided for each of the first and second display devices. 5. The projection type display device according to claim 2, wherein each of the end openings of the plurality of branch pipes is a plan view of each of the light modulation devices arranged laterally. A projection display device characterized by being configured to be surrounded by. 6. The projection display device according to claim 1, wherein the intake fan is arranged at a position shifted from the electro-optical device in a plan view. Projection display device. 7. The projection type display device according to claim 6, wherein said intake fan is arranged near said projection lens. 8. The projection display device according to claim 1, wherein the intake fan is a centrifugal fan that discharges air taken in by a rotation of the fan in a tangential direction of the rotation. A projection display device characterized by the above-mentioned.