JPH09329841A - Liquid crystal type projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a liquid crystal system projector compact as a whole by enabling to store a lens barrel in a case main body and also to pull the lens barrel out of the case main body. SOLUTION: A liquid crystal panel 10 and a Fresnel lens 11 are arranged at one longitudinal end part of a box-shaped case 2, and a light source 9 is arranged at the other end part. The lens barrel 12 is rotatably attached with the case 2 through an arm 7 and a spring 15. A projecting lens 13 is mounted in the lens barrel 12. When in use, the lens barrel 12 is pulled out of the case 2 in order to use the projector, when in carrying, the lens barrel 12 is stored in the case 2 in order to carry the projector. The user can carry the whole projector in the compact state, so that the projector effectively functions as a handy projector.

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, and more particularly to a liquid crystal projector which is effective as a handy type and is compact in size.

[0002]

2. Description of the Related Art Generally, there are various types of projectors used for enlarging and displaying images such as data at various research presentations and the like. For example, a liquid crystal projector as shown in FIG. 21 is known.

That is, the liquid crystal projector 21
Is a case 22 in which a projection lens 23, a liquid crystal plate 24, a Fresnel lens 25, and a light source 26 are provided in a line with their optical axes aligned, and the light from the light source 26 is passed through the Fresnel lens 25. The light is guided to the liquid crystal plate 24, the light is transmitted or blocked by the liquid crystal plate 24 to form an optical image on the liquid crystal plate 24, and the optical image is projected on a screen (not shown) or the like via the projection lens 23. Thus, an image such as data can be displayed on a large screen.

However, in the liquid crystal projector 21 as described above, due to its structure, the liquid crystal plate 24 and the light source 26 are provided.
Since the distance between and must be long, the total length becomes long and the whole is too large to be used as a handy type.

On the other hand, in order to solve the above problems, a liquid crystal projector 31 as shown in FIG. 8 has been proposed. The liquid crystal projector 31 includes two reflecting mirrors 37 and 38 between a light source 36 and a liquid crystal plate 34,
The distance between the light source 36 and the liquid crystal plate 34 is shortened, and the total length can be made shorter than that of the liquid crystal projector 21 described above.

However, in such a liquid crystal projector 31, although the total length can be shortened, since the optical path is bent by using the two reflecting mirrors 37 and 38, the volume is correspondingly reduced. It becomes large and the whole is too large to be used as a handy type.

The present invention solves the above-mentioned problems of the conventional ones, and provides a liquid crystal projector which can be made compact as a whole and can be effectively used as a handy type. The purpose is to do.

[0008]

In order to solve the above-mentioned problems, the present invention provides a light source, a liquid crystal plate and a projection lens in a case with their optical axes aligned with each other. In the liquid crystal projector, which transmits or blocks the liquid crystal plate to form an optical image on the liquid crystal plate and projects the optical image on a screen or the like via the projection lens, A means is provided that is provided inside a lens barrel formed separately from the case, and that the lens barrel can be stored in the case and can be taken out from the case.

[0009]

The present invention adopts the above-mentioned means so that the lens barrel having the projection lens can be housed in the case and taken out from the case. By storing it, the whole can be carried in a compact state, and at the time of use, a desired function can be exhibited by taking out the lens barrel from the case.

[0010]

Embodiments of the present invention shown in the drawings will be described below. 1 and 2 show an embodiment of a liquid crystal projector according to the present invention. FIG. 1 is a schematic perspective view showing the whole, and an explanatory view showing a state in which a lens barrel is taken out. FIG. 3 is a schematic perspective view showing the whole and is a schematic perspective view showing a state in which a lens barrel is housed.

That is, the liquid crystal projector 1 according to this embodiment is housed in a case 2, a case 2 having a box shape, a light source 9 attached to the case 2, a liquid crystal plate 10, a Fresnel lens 11, and a case 2. The lens barrel 12 is capable of being taken out from the case 2, and a projection lens 13 mounted in the lens barrel 12.

The case 2 is rotatably attached to a box-shaped case main body 3 having an opening from the upper surface to one side surface, and hinges 17 and 17 at the opening edge of the case main body 3, and the opening of the case main body 3 is opened. L-shaped lid member 1 that can be opened and closed
6 is comprised.

One end side mounting portion 4 having a predetermined thickness is formed at one end portion in the longitudinal direction of the case body 3, and the one end side mounting portion 4 has a hole 4 penetrating inside and outside the case body 3.
a is provided, and the liquid crystal plate 10 and the Fresnel lens 11 are mounted in the hole 4a with the liquid crystal plate 10 facing outside.

The other end portion of the case body 3 in the longitudinal direction is formed with the other end side mounting portion 5 having a predetermined thickness, and the other end side mounting portion 5 is provided with a predetermined opening to the inner surface side of the case body 3. A hole 5a having a depth of 5 is formed, and the light source 9 is mounted in the hole 5a so as to emit light toward the inside of the case body 3.

In the mounting portion 4 on one end side of the case body 3, two notches 6 and 6 are provided so as to sandwich the hole 4a from both sides.
Has a predetermined width and depth. A flat plate-shaped arm 7 is rotatably attached to each cut 6 via a pin 8. A groove 7a penetrating each arm 7 in the thickness direction is bored with a predetermined length in each arm 7, and a pin 14 provided on an outer peripheral surface of a lens barrel 12 described later is positioned in the groove 7a in a loosely fitted state. It is supposed to do.

The lens barrel 12 has a tubular shape, and the projection lens 13 is mounted in the lens barrel 12. Pins 14 and 14 are integrally provided at respective portions of the outer peripheral surface of the lens barrel 12 that face each other around the center of the lens barrel 12, and each pin 14 is located in the groove 7a of each arm 7 in this state. By mounting the spring 15 between each pin 14 and each pin 8 of each arm 7, the lens barrel 12
Is attached to the case body 3 via the arms 7, 7.

At the time of projection, the lens barrel 12 is located outside the case body 3, and the entire body is pressed in the direction of the case body 3 by the urging force of the springs 15 and 15. The optical axis of is located on the optical axes of the liquid crystal plate 10, the Fresnel lens 11 and the light source 9 (see FIG. 3).

Then, when the light from the light source 9 is guided to the liquid crystal plate 10 through the Fresnel lens 11, the light is emitted.
An optical image is formed on the liquid crystal plate 10 by being transmitted or blocked by the liquid crystal panel 10 and the optical image is projected on a screen (not shown) or the like via the projection lens 13 in the lens barrel 12.
Images such as data can be displayed on a large screen on a screen or the like.

When the projection is completed and the lens barrel 12 is housed in the case body 3, first, the lens barrel 12 is pulled in the direction away from the case body 3 against the biasing force of the springs 15, 15. A predetermined gap is formed between the lens barrel 12 and the case body 3 (see FIG. 4). Then, while maintaining this state, the lens barrel 12 is rotated toward the case body 3 (see FIG. 5), and the lens barrel 12 is positioned inside the case body 3 (see FIG. 6). In this state, the lens barrel 12 is the spring 1
The entire body is pressed against the inner surface of the case body 3 by the urging forces of 5 and 15. By repeating a series of operations in this way, the lens barrel 12 can be taken out from the case main body 3 or housed inside the case main body 3.

In the liquid crystal projector 1 according to this embodiment configured as described above, the lens barrel 12 can be housed in and taken out of the case body 3, so that the lens barrel 12 can be used as a case during use. A state in which the function as the liquid crystal projector 1 can be effectively exerted by taking it out from the main body 3, and the lens barrel 12 is housed inside the case main body 3 to make the whole compact when carrying it or the like. You will be able to carry it with you. Therefore, it can be effectively used as a handy type.

[0021]

As described above, according to the present invention, the lens barrel can be housed inside the case body and can be taken out from the case body. Therefore, the function as a projector can be effectively exerted by taking out the lens barrel from the case body during use, and the entire body is made compact by storing the lens barrel inside the case body when carrying it. It will be possible to carry around in the state. Therefore, it has an excellent effect that it can be effectively used as a handy type.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire embodiment of a liquid crystal projector according to the present invention, and an explanatory view showing a state in which a lens barrel is taken out (a state at the time of projection).

FIG. 2 is an explanatory view showing a state in which the lens barrel of the one shown in FIG. 1 is stored.

FIG. 3 is a schematic diagram showing a state of what is shown in FIG. 1 at the time of projection.

FIG. 4 is a schematic view showing the state of starting the storage of the one shown in FIG.

FIG. 5 is a schematic view showing the state shown in FIG. 1 during storage.

FIG. 6 is a schematic view showing the state shown in FIG. 1 when the storage is completed.

FIG. 7 is a schematic view showing an example of a conventional liquid crystal projector.

FIG. 8 is a schematic view showing another example of a conventional liquid crystal projector.

[Explanation of symbols]

 1, 21, 31 ... liquid crystal projector 2, 22 ... case 3 ... case body 4 ... one end side mounting portion 4a, 5a ... hole 5 ... other end side mounting portion 6 ... notch 7 ... arm 7a ... Groove 8, 14 ... Pin 9, 26, 36 ... Light source 10, 24, 34 ... Liquid crystal plate 11, 25 ... Fresnel lens 12 ... Lens barrel 13, 23 ... Projection lens 15 ... Spring 16 ... Lid member 17 ... Hinge 37, 38 ... Reflector

Claims (1)

[Claims] 1. A light source, a liquid crystal plate and a projection lens are provided in a case with their optical axes aligned with each other, and light of the light source is transmitted or blocked by the liquid crystal plate to form an optical image on the liquid crystal plate. In addition, in the liquid crystal projector adapted to project the optical image on a screen or the like via the projection lens, the projection lens is provided in a lens barrel formed separately from the case, and the mirror is provided. A liquid crystal projector in which a cylinder can be stored in the case and can be taken out from the case.