JP2638272B2 - LCD projector - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector for enlarging and projecting liquid crystal panels by using light from a light source, and more particularly to a filter having a light for a projected image provided inside the main body. To a liquid crystal projector that can move and reflect and absorb light.

2. Description of the Related Art Conventionally, an apparatus for enlarging and projecting an image on a liquid crystal panel using a light source such as a metal halide has been released, and is generally called a liquid crystal projector. In this method, light emitted from a light source is condensed on a liquid crystal panel via a mirror and a dichroic mirror, and is projected on an external screen through a projection lens. When cutting off the light amount from the light source, the light is projected via a filter or the like.

SUMMARY OF THE INVENTION Problems to be Solved by the Invention However, in general, filters are frequently used, such as when cutting off the amount of light, but are often troublesome because they are retrofitted from the outside when necessary, and have to be stored.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a liquid crystal projector capable of partially reflecting or absorbing light rays emitted from a projection lens by moving a filter provided inside a main body to the outside with one touch.

Means for Solving the Problems To achieve the above object, a liquid crystal projector according to the present invention includes a light source, a cold mirror that separates visible light and infrared light from the light source, and controls transmission of light from the light source. A liquid crystal group, a half mirror group for performing color separation and color synthesis of light from the light source, a projection lens for enlarging and reducing a transmitted light image by the liquid crystal group, the liquid crystal group, the projection lens,
An optical support member that holds the half mirror group, a light source support that holds the light source and the cold mirror,
A filter that reflects or absorbs a part of the transmitted light image, the light source, the cold mirror, the liquid crystal group, the half mirror group, the projection lens, the light source support member,
A liquid crystal projector comprising the light source support and a main body case including the filter, wherein the filter reflects and absorbs the transmitted light image from a first position which does not reflect or absorb a part of the transmitted light image. The position can be changed by rotation of the rotating body from the outside of the main body case to a second position.

Function The present invention enables the light emitted from the projection lens and the liquid crystal layer to be moved by a filter provided inside the main body with a touch, and the extra light can be reflected and absorbed. Can respond,
It can be realized with a small space and one touch.

Embodiment FIG. 1 is a schematic side view showing an entire liquid crystal projector according to an embodiment of the present invention, and FIG. 2 is a front view thereof.

In FIG. 1, reference numeral 1 denotes a light source, 2 denotes a cold mirror for separating infrared light and visible light from the light source 1, and 3 denotes these light sources 1.
And a light source support for holding a cold mirror. The optical support members 4A and 4B for holding the panel 5, the dichroic mirror 6, and the like have a configuration in which the light source box support 6 is partially sandwiched. In color separation, a white light emitted from the light source 1 is separated into red, blue, and green by dichroic mirrors 6a to 6c to form a lens.
15 and pass through the respective liquid crystal panels 5a to 5c. The liquid crystal panels 5 are respectively fixed to mounting brackets 16. Red, blue, and green are combined with white light by the dichroic mirrors 6d to 6f in the same manner. The administration lens 7 is also attached to the optical support members 4A and 4B. The entire body is covered by a main body cover 8. The filter 20 is mounted on a fixed plate 21 and is rotatably mounted on a support shaft 22 around an elongated hole (not shown) provided in the optical support member 4A.
Further, a pin 23 is fixed to the fixed plate 21 and is fitted in a slide hole 25 provided in the rotating lever 24. The rotating lever 24 is a rotating ring 26 integrated so as to be rotatable from outside the body cover 8.
And the fulcrum shaft 27 as a center.

The operation of the liquid crystal projector configured as described above will be described below. The light quantity of the image formed on the external screen by the projection lens 7 is partially reflected and absorbed when the filter 20 enters the C state in which it is exposed to the outside.

In the state A, the reflecting mirror 20 and the fixed plate 21 are housed inside the main body. The reflecting mirror 20 and the fixed plate 21 are changed from the A state to the C state via the B state. When the rotating ring 26 is rotated, the pin 23 which is slidable in the sliding hole 25 of the rotating lever 24 also becomes a support shaft. The fixed plate 21 rotates around the center 22.
In this configuration, these are movably installed until the fixed plate 21 is located in the C state (position 90 degrees with respect to the optical axis of the administration lens 7).

As described above, according to this embodiment, it is possible to move the filter 20 provided inside the main body to the outside with a single touch, so that light emitted from the projection lens 7 can be reflected and absorbed, and a filter is required. It can be used immediately and can be realized with a small space and one touch. In this configuration, a part of the light beam image that has passed through the projection lens is cut.However, a method in which a filter is interposed between the liquid crystal group and the projection lens, or a method in which a predetermined color filter is placed before color synthesis is used. It is valid.

Effects of the Invention As described above, according to the present invention, a light source, a cold mirror that separates visible light and infrared light from the light source, a liquid crystal group that controls transmission of light from the light source, A half mirror group for separating and combining light, a projection lens for enlarging and reducing a transmitted light image by the liquid crystal group, an optical support member for holding the liquid crystal group, the projection lens, and the half mirror group, and the light source And a light source support that holds the cold mirror, a filter that reflects or absorbs a part of the transmitted light image, the light source, the cold mirror, the liquid crystal group, the half mirror group, the projection lens, A liquid crystal projector comprising a light source support member, the light source support, and a main body case containing the filter, wherein the filter reflects and absorbs a part of the transmitted light image. Since the position can be changed by moving the rotator from the outside of the main body case to the second position for reflecting and absorbing the transmitted light image from the first position which is not accommodated, the extra light amount of the light beam emitted from the projection lens is filtered. Can be reflected and absorbed, and can be used immediately in applications that require a filter, and can be realized in a small space.
Its practical effect is extremely large.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a liquid crystal projector according to an embodiment of the present invention, and FIG. 2 is a front view of FIG. 1 light source, 3 light source support, 7 projection lens, 20
... filter, 21 ... fixed plate, 26 ... rotating ring.

Claims (1)

(57) [Claims] 1. A light source, a cold mirror for separating visible light and infrared light from the light source, a liquid crystal group for controlling transmission of light from the light source, and color separation and color synthesis of light from the light source. A half mirror group, a projection lens for enlarging or reducing a transmitted light image by the liquid crystal group, an optical support member for holding the liquid crystal group, the projection lens, and the half mirror group, and holding the light source and the cold mirror. A light source support, a filter that reflects or absorbs a part of the transmitted light image, the light source, the cold mirror, the liquid crystal group,
A liquid crystal projector including the half mirror group, the projection lens, the light source support member, the light source support, and a main body case including the filter, wherein the filter reflects and absorbs a part of the transmitted light image. A liquid crystal projector in which the position can be changed by moving a rotating body from the outside of the main body case to a second position for reflecting and absorbing the transmitted light beam image from a first position where the transmitted light image is not reflected.