JP3022144B2 - LCD projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector which modulates light from a light source by a liquid crystal panel in accordance with a video signal and enlarges and displays the modulated light through a projection lens.

[0002]

2. Description of the Related Art Conventionally, a liquid crystal projector using three liquid crystal panels (hereinafter, abbreviated as a three-panel liquid crystal projector) is generally used as this type of apparatus. Hereinafter, a three-panel liquid crystal projector will be described.

FIG. 6 is an overall block diagram of a general liquid crystal projector.

In FIG. 6, white light emitted from a light source 1 is converted into parallel light by a bowl-shaped reflecting plate 2, infrared rays are removed by an infrared cut filter 3, and then enters a green light separating dichroic mirror 4G. Is done.

[0005] The green light separating dichroic mirror 4G separates green light from white light, and the separated green light is reflected by a reflecting mirror 5A and then to a green light liquid crystal panel 7G via a condenser lens 6G. Incident.

On the other hand, the green light separating dichroic mirror 4
The red light and the blue light that have passed through G enter the red light separating dichroic mirror 4R. The red light separating dichroic mirror 4R separates red light from the incident light,
The separated red light is incident on the liquid crystal panel for red light 7R via the condenser lens 6R.

The red light separating dichroic mirror 4
The blue light that has passed through R enters the blue light liquid crystal panel 7B via the condenser lens 6B.

Each of the liquid crystal panels 7G, 7R, and 7B modulates the light of each of the primary colors incident thereon by a video signal from a video circuit (not shown).

The green light modulated by the green light liquid crystal panel 7G and the red light modulated by the red light liquid crystal panel 7R are combined by the red light combining dichroic mirror 8R and then combined. The light is incident on the blue light combining dichroic mirror 8B.

The blue light modulated by the blue light liquid crystal panel 7B is reflected by the reflection mirror 5B, and then enters the blue light synthesizing dichroic mirror 8B.

In the blue light combining dichroic mirror 8B, the combined light of the green light and the red light and the blue light are combined, and the combined light is projected on a screen (not shown) via the projection lens 9. Enlarged display.

As a result, the viewer can observe the image enlarged and displayed on the screen.

By the way, the light source of a liquid crystal projector generally generates high heat, and this heat deteriorates the life of the lamp of the light source. For this reason, as shown in FIG. 7, an axial fan 10 for cooling a light source is conventionally provided on a side surface thereof.

FIG. 7 is an enlarged sectional view of the vicinity of the light source of the liquid crystal projector.

In FIG. 7, the heat A generated by the light source,
Further, the heat B generated by each liquid crystal panel or the infrared cut filter was discharged to the outside of the liquid crystal projector by the axial fan 10.

[0016]

However, in the above-mentioned prior art, the heat C generated by the light source cannot be sufficiently discharged to the outside of the liquid crystal projector. Further, since the reflector constituting the light source has a bowl shape, the heat generated by the light source tends to be trapped inside the reflector, and it has been difficult to efficiently discharge the heat to the outside of the liquid crystal projector.

The present invention has been made in view of the above-mentioned drawbacks, and has as its object to provide a liquid crystal projector having a simple structure and efficient cooling means.

[0018]

SUMMARY OF THE INVENTION The present invention provides a liquid crystal panel for optically modulating an input video signal, a light source for supplying light to the liquid crystal panel, and a projection lens for projecting light modulated by the liquid crystal panel. And a cooling means having a fan for cooling the heat generated by the light source and a wind guide for discharging the heat collected by the fan to the outside of the liquid crystal projector. .

Further, the present invention provides a liquid crystal panel for optically modulating an input video signal, a light source comprising a reflector and a lamp having a notch for radiating heat, and a light source for supplying light to the liquid crystal panel. A projection lens for projecting light modulated by the liquid crystal panel, a fan for cooling heat generated through a notch in the reflector constituting the light source, and a heat collected by the fan to the outside of the liquid crystal projector. And a cooling means having an air guide for discharging the liquid crystal projector.

[0020]

According to the present invention, as described above, the heat A generated by the light source and the heat B generated by the infrared cut filter or the liquid crystal panel are discharged to the outside of the liquid crystal projector by the axial fan.

On the other hand, heat C generated from the light source is discharged to the outside of the liquid crystal projector by a cross flow fan arranged at the rear of the liquid crystal projector.

Further, notches are provided above and below the reflector constituting the light source, and the heat trapped in the reflector from the notches is efficiently discharged to the outside of the liquid crystal projector.

[0023]

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

FIG. 1 is an overall block diagram of the liquid crystal projector of the present invention.

In FIG. 1, white light emitted from a light source 1 is converted into parallel light by a bowl-shaped reflecting plate 2, infrared rays are removed by an infrared cut filter 3, and then enters a green light separating dichroic mirror 4G. Is done.

The green light separating dichroic mirror 4G separates the green light from the white light, and the separated green light is reflected by the reflecting mirror 5A and then to the green light liquid crystal panel 7G via the condenser lens 6G. Incident.

On the other hand, the green light separating dichroic mirror 4
The red light and the blue light that have passed through G enter the red light separating dichroic mirror 4R. The red light separating dichroic mirror 4R separates red light from the incident light,
The separated red light is incident on the liquid crystal panel for red light 7R via the condenser lens 6R.

The red light separating dichroic mirror 4
The blue light that has passed through R enters the blue light liquid crystal panel 7B via the condenser lens 6B.

Each of the liquid crystal panels 7G, 7R, and 7B modulates the light of each of the primary colors incident thereon by a video signal from a video circuit (not shown).

The green light light-modulated by the green light liquid crystal panel 7G and the red light light-modulated by the red light liquid crystal panel 7R are synthesized by a red light synthesizing dichroic mirror 8R and then synthesized. The light is incident on the blue light combining dichroic mirror 8B.

The blue light modulated by the blue light liquid crystal panel 7B is reflected by the reflecting mirror 5B, and then enters the blue light combining dichroic mirror 8B.

In the blue light combining dichroic mirror 8B, the combined light of green light and red light and the blue light are combined, and the combined light is projected on a screen (not shown) via the projection lens 9. Enlarged display.

As a result, the viewer can observe the image enlarged and displayed on the screen.

Here, a notch 2A is provided above the reflector 2 constituting the light source.
The heat inside the reflector is discharged to the outside of the reflector via A.

In addition to the axial fan 10 arranged on the side of the liquid crystal projector, a cross flow fan 11 is arranged at the rear of the light source.
1 discharges heat to the outside of the liquid crystal projector.

Next, the heat discharging structure and operation of the liquid crystal projector of the present invention will be described with reference to FIGS.

FIG. 2 is an enlarged top sectional view near the light source of the liquid crystal projector of the present invention, and FIG. 3 is an enlarged side sectional view near the light source of the liquid crystal projector of the present invention.

FIG. 4 is a perspective view of a reflector constituting the light source, and FIG. 5 is a front view of the reflector as viewed from the opening side.

The light source 1 is composed of a lamp 12 and a reflector 2, and the lamp 12 and the reflector 2 are mounted on a first lamp house 13 having a handle 13B used when replacing the light source. The first lamp house 13 is a second lamp house 14 provided on the liquid crystal projector main body side.
, And slidable with respect to the second lamp house 14. In addition, since the second lamp house 14 is fixed to the bracket 15 for fixing the infrared cut filter 3, the second lamp house 13 is accurately attached to a specific place of the liquid crystal projector main body.

The upper and lower surfaces of the first lamp house 13 and the second lamp house 14 have openings 13A, 14A, respectively.
A is provided, and heat in the light source 1 is discharged to the outside of the first lamp house 13 and the second lamp house 14 through the open lights 13A and 14A.

For this reason, the air inside the liquid crystal projector is discharged from the first lamp house 1 as shown by arrows a and b in FIG.
3 and the reflector 2 from the lower opening of the second lamp house 14.
A is discharged to the outside of the first lamp house 13 and the second lamp house 14 through the upper opening of the first lamp house 13 and the second lamp house 14.

Next, a cross flow fan 11 is attached to the rear surface of the liquid crystal projector main body, and the heat inside the liquid crystal projector main body is transmitted to the outside of the liquid crystal projector by the cross flow fan 11 as shown by an arrow C in FIG. Is discharged.

The rear surface of the liquid crystal projector has an opening for taking out the light source 11, and a back cover 16 is attached to this opening. The back cover 16 is provided with an opening 16A for discharging the heat discharged from the cross flow fan 11 to the outside, and a wind guide 16B for guiding the discharged heat downward.

As shown in FIG. 3, the air guide 16B is sufficiently larger (specifically, 3 to 4 cm) than the dimension C of the opening 16A, so that light from the light source 1 passes through the opening 16A through the opening 16A. To prevent leakage to the outside through The heat guide space D of the back cover 16 is 2
About 3 cm is required, and if it is less than 3 cm, the thermal cooling effect will be impaired.

For this reason, the direction of the heat discharged from the cross flow fan 11 to the outside of the liquid crystal projector is changed downward by the air guide 16B as shown by the arrow d in FIG.

Further, in the liquid crystal projector of the present invention, in addition to the method of discharging heat by the cross flow fan 11, heat is discharged in the lateral direction of the liquid crystal projector by the axial flow fan 10.

Further, by using a suction fan (not shown) for cooling the liquid crystal panel, heat can be efficiently discharged. That is, the outside air taken in by the suction fan is taken into the inside of the liquid crystal projector by the above-described light source cooling fan, that is, the cross flow fan 11 and the axial flow fan 10, as shown by the arrow H in FIG. E, F, G, or arrow,
The air in the liquid crystal projector is circulated through the flow paths E, B, C, and D, and the air in the liquid crystal projector main body can flow out to the outside, so that heat can be efficiently discharged.

Thus, the heat generated by the light source 1 is
Notch 2A of reflector 2 and first lamp house 1
3, and is discharged to the outside of the first lamp house and the second lamp house 14 through the openings 13A and 14A of the second lamp house 14 (arrow B), and then discharged to the outside of the liquid crystal projector by the cross flow fan 11. (Arrow c). Then, the heat exhausted by the air guide 16B provided on the back cover 16 is changed in the exhaust direction downward, and when the operator operates the liquid crystal projector from the rear,
The operator is prevented from receiving the above-mentioned heat.

Further, by making the dimension B of the air guide 16B longer than the dimension C of the opening 16A provided in the back cover 16, light leaking through the opening 16A can be blocked, so that the liquid crystal projector can be easily viewed. , Discomfort can be prevented.

[0050]

According to the present invention, as described above, the heat generated from the light source can be completely discharged to the outside of the liquid crystal projector, and the deterioration of the liquid crystal panel and the light source can be suppressed.

Further, according to the present invention, the air guide guide not only prevents the operator of the liquid crystal projector from receiving heat, but also prevents the light generated from the light source from leaking out of the liquid crystal projector. No discomfort.

[Brief description of the drawings]

FIG. 1 is a block diagram of a liquid crystal projector of the present invention.

FIG. 2 is an enlarged top cross-sectional view near a light source of the liquid crystal projector of the present invention.

FIG. 3 is an enlarged side sectional view of the vicinity of a light source of the liquid crystal projector of the present invention.

FIG. 4 is a perspective view of a reflector constituting a light source.

FIG. 5 is a front view of the reflector constituting the light source as viewed from the opening side.

FIG. 6 is a block diagram of a conventional liquid crystal projector.

FIG. 7 is an enlarged side sectional view near a light source of a conventional liquid crystal projector.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 light source 2 reflector 2A cutout portion 3 infrared cut filter 7R liquid crystal panel for red 7G liquid crystal panel for green 7B liquid crystal panel for blue 10 axial fan 11 cross flow fan 16 back cover 16B air guide

Claims (2)

(57) [Claims] 1. A liquid crystal panel for optically modulating an input video signal, a reflector having a notch for radiating heat, and a lamp, and a light source for supplying light to the liquid crystal panel; A projection lens for projecting the modulated light, a fan for cooling the heat generated through the notch of the reflector constituting the light source, and a wind guide for discharging the heat collected by the fan to the outside of the liquid crystal projector And a cooling means having a guide. 2. The liquid crystal projector according to claim 1, wherein said fan is a cross flow fan.