JP3142012B2 - Projection type image display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type image display device suitable for use in, for example, a liquid crystal projector mounted on an aircraft.

[0002]

2. Description of the Related Art In a liquid crystal projector, light is generated by a lamp, this light is separated into R, G, and B color signals, and the split light is incident on an LCD that displays R, G, and B images. Let it. Then, the light transmitted through the LCD is synthesized again,
The image is projected on the screen by a lens.

[0003] Since lamps generate a relatively large amount of heat,
It is necessary to discharge this heat to the outside. Conventionally, this heat has been arranged by disposing a fan near the lamp and discharging the heat in a direction perpendicular to the direction in which light is projected by the lens.

[0004]

In the conventional apparatus, a fan is disposed in the vicinity of the light source, and the fan discharges heat from the side of the housing closest to the light source. A space for mounting the fan in the direction must be provided, and there has been a problem that the device becomes large. In addition, for example, when the device is used in an aircraft or the like, since the device is arranged on the ceiling and all surfaces other than the direction in which light is projected from the lens are blindfolded, there is a problem that heat cannot be effectively discharged. there were.

The present invention has been made in view of such circumstances, and aims to efficiently discharge heat without increasing the size of an apparatus.

[0006]

According to the projection type image display device of the present invention, when the light source is disposed adjacent to the optical unit,
In both cases, the emission direction of the light is opposite to the projection direction of the lens
And the optical unit emits light from the light source.
Mirror that reflects the light
And the fan is arranged on the side opposite to the light emission direction of the light source.
And discharges air near the light source in the projection direction of the lens.
The cooling means uses heat generated by the light source to project the lens
Light source moved by a fan to be ejected in the direction
Guides the air near the lens in the projection direction of the lens.
When the air in the optical unit is
It is characterized by regulating emission .

[0007]

In the projection type image display apparatus having the above structure, the heat generated by the light source is discharged to the outside from the same side as the lens by the fan. Therefore, heat can be efficiently discharged without increasing the size of the device.

[0008]

FIG. 1 is a plan view showing the configuration of an embodiment of a projection type image display apparatus according to the present invention. Inside the housing 1, a metal halide lamp 2 for projection, an optical unit 3,
The light from the optical unit 3 is transmitted to the screen 33 (see FIG. 2).
, A lamp case 4 provided so as to cover the periphery of the lamp 2, and a duct 5 for guiding heat from the lamp case 4 to the same side (the upper side in the figure) of the lens 21. And a fan 6 for discharging the heat guided by the duct 5 to the outside.

Inside the optical unit 3, mirrors 11,
13, 15, dichroic mirrors 12, 14, 16,
17, LCDs 18, 19 and 20 are provided.

FIG. 2 shows an attached state of the device shown in FIG. An accommodation portion 32 is provided on the ceiling 31 of the aircraft, and accommodates therein the projection type image display device shown in FIG. The housing 32 is provided at the bottom of the device,
The right side surface, the left side surface, and the back surface are each covered in a blind state, and a part of the front surface where the lens 21 is provided is also covered in a blind state. However, the remaining part of the front (the part between the ceiling) is not closed so that the light emitted from the lens 21 can be projected on the screen 33. The passenger can enjoy the image displayed on the screen 33 while sitting on the chair 34.

Next, the operation will be described. LCD
R, G, and B images are displayed on 18, 19, and 20, respectively. Light emitted from the metal halide lamp 2 is reflected by a mirror 11 and is incident on a dichroic mirror 12. The dichroic mirror 12 reflects the R component from the incident light and transmits the remaining G and B components. R
The component light is incident on the LCD 18. The light transmitted through the LCD 18 is light corresponding to the R image, and this light is incident on the dichroic mirror 16.

On the other hand, the G and B lights transmitted through the dichroic mirror 12 are reflected by the mirror 13 and enter the dichroic mirror 14. The dichroic mirror 14 reflects the G component of the incident light and transmits the B component. The light of the G component is incident on the LCD 19 and irradiates a G image. The light emitted from the LCD 19 enters the dichroic mirror 16, is reflected there, and is combined with the R component light incident from the LCD 18.

The B component light emitted from the dichroic mirror 14 is incident on the LCD 20 and illuminates the B image. Light emitted from the LCD 20 is reflected by the mirror 15 and enters the dichroic mirror 17. The dichroic mirror 17 combines the light incident from the mirror 15 and the light incident from the dichroic mirror 16,
The light is emitted to the lens 21. The lens 21 projects the combined light of R, G, and B on a screen 33 and displays a color image thereon.

When the metal halide lamp 2 is on, the fan 6 is rotated. Thereby, the heat generated by the lamp 2 is transmitted to the fan 6 via the lamp case 4 and the duct 5, and is discharged from the fan 6 to the outside. By covering the lamp 2 with the lamp case 4 and connecting the lamp case 4 to the fan 6 with the duct 5, it is possible to efficiently discharge the heat of the metal halide lamp 2, which generates the most heat, to the outside. . In other words, if the duct 5 is not provided, air in a place other than the vicinity of the lamp 2 (its temperature is not so high) is also discharged by the fan 6, and the heat discharging efficiency is reduced.

The fan 6 is provided so that the lens 21 projects light. As described above, the lens 21
The side from which the light is generated is not blindfolded for the sake of transmitting the light. Therefore, heat can be efficiently discharged therefrom. Further, since the fan 6 is oriented in the light projection direction, the width of the device in the left-right direction can be reduced as compared with the case where the fan 6 is arranged on the left side of the lamp 2 in FIG.

FIG. 3 shows a second embodiment of the present invention. In the embodiment of FIG. 1, the fan 6 is arranged apart from the metal halide lamp 2, but in the embodiment of FIG. 3, it is arranged close to the metal halide lamp 2. That is, in the embodiment of FIG. 1, heat is extracted, but in the embodiment of FIG. 3, heat is extracted. In either case, heat can be effectively discharged.

[0017]

As described above, according to the projection type image display apparatus of the present invention, the heat generated by the light source is discharged to the outside from the same side as the lens, so that the heat can be effectively discharged. Not only can this be achieved, but also the size of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of an embodiment of a projection type image display device of the present invention.

FIG. 2 is a side view illustrating a use state of the embodiment of FIG. 1;

FIG. 3 is a plan view showing the configuration of another embodiment of the projection type image display device of the present invention.

[Explanation of symbols]

 Reference Signs List 1 housing 2 metal halide lamp 3 optical unit 4 lamp case 5 duct 6 fan 11, 13, 15 mirror 12, 14, 16, 17 dichroic mirror 18, 19, 20 LCD 21 lens 31 ceiling 32 housing part 33 screen 34 chair

────────────────────────────────────────────────── (5) References JP-A-58-211742 (JP, A) JP-A-63-78941 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 21/16 H04N 5/74

Claims (1)

(57) [Claims] 1. A light source for generating light, and a separation for separating light from the light source into lights of different colors.
An optical system, and the plurality of different colors separated by the separation optical system.
Light modulator that modulates light based on the image signal of the corresponding color
And light of the plurality of different colors modulated by the light modulation unit.
An optical unit having a synthesizing optical system for synthesizing light, and projecting light synthesized by the synthesizing optical system onto a screen
And a fan for discharging heat generated from the light source to the outside.
Cooling means, the light source, the optical unit, the lens, and the
A projection type image display device having a housing for covering the cooling means.
And the light source is disposed adjacent to the optical unit.
In both cases, the light emission direction is the same as the projection direction of the lens.
The optical unit is arranged so as to be opposite, and reflects light emitted from the light source.
And further comprising a mirror for guiding the direction of the lens, the fan distribution on the side opposite to the emission direction of the light of the light source
The air near the light source and the projection method of the lens.
And the cooling means discharges the heat generated from the light source
So that it is ejected in the projection direction of the noise.
The air near the light source to be moved is
While guiding the air in the optical unit,
A projection-type image display device , which regulates direct discharge in the projection direction of the lens .