JPH10246823A - Projecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bright picture by improving light receiving area efficiency in a projecting device using an optical fiber. SOLUTION: As to this projecting device; at least the cross-sectional shape of the light receiving part of the optical fiber having the light receiving part 31 and a light emitting part transmitting and emitting received light is formed to be a polygonal shape having an angular part 310. When a light receiving surface 20 which receives the light projected from a projector is constituted by binding plural light receiving parts of the optical fiber, a gap is not formed between adjacent parts 31 on the surface 20, so that the light receiving area efficiency of this projecting device is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a projection device using an optical fiber.

[0002]

2. Description of the Related Art A projection apparatus for projecting an enlarged image using a large number of optical fibers has been developed and published. The outline of these devices will be described. The optical fiber has a light receiving portion and a light emitting portion. The light receiving portion is formed by bundling the fibers and aligning the end faces. Then, an image is projected on the end face of the light receiving section by a projector such as a liquid crystal projector. The light projected on the light receiving section
The light is transmitted through the fiber and reaches another end surface, and the received light is emitted by the light emitting unit. In the light emitting section, the fibers are arranged at appropriate intervals according to the enlargement ratio, so that an enlarged image can be obtained.

[0003]

FIG. 5 shows a light receiving surface of a conventional projection apparatus. The light receiving surface 200 is formed by arranging optical fibers 250 having a circular cross section. Since the light receiving surface 200 has a rectangular shape, even if the fibers 250 are densely arranged, the adjacent fibers 25
A space 270 is created between the zeros. The space 270 occupies about 9.5% of the entire light receiving surface (light receiving area efficiency is 90.5%), and the light received by this space part is lost. However, as long as a fiber having a circular cross section is used, this space cannot be reduced to improve the light receiving area efficiency. Therefore, an object of the present invention is to provide a projection apparatus in which the space between bundled fibers on the light receiving surface is reduced to improve the light receiving area efficiency.

[0004]

According to the present invention, there is provided a projection apparatus comprising: an optical fiber having a light receiving portion and a light emitting portion for transmitting and receiving the received light, wherein at least the cross section of the light receiving portion is formed in a polygonal shape. Have. Then, when the projecting device forms a light receiving surface for receiving the light projected from the projector by bundling the light receiving portions of the plurality of optical fibers, the light receiving surface does not form a gap between the adjacent light receiving portions. The light receiving area efficiency is improved.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An outline of a projection apparatus using an optical fiber will be described (see FIG. 2). The projection apparatus 100 includes a projector 10 such as a liquid crystal projector for projecting an image, a projection panel 40 for enlarging and projecting an image, and an optical fiber 30 for communicating the projector 10 with the projection panel 40. The optical fiber 30 has a light receiving portion 31 disposed on the light receiving surface 20 for receiving an image from the projector 10, a wire portion 33 through which light passes, and a light emitting portion 35 projecting from a hole of the projection panel 40 and emitting light. .

The light receiving surface 20 is formed by bundling the light receiving portions 31 which are the ends of the fiber 60 and aligning the end surfaces.
One end of the optical fiber 60 has a regular hexagonal cross section. When the ends of the regular hexagonal cross section are juxtaposed as the light receiving portion 31 of the optical fiber 60, the adjacent optical fiber 60
The light receiving section 31 of the optical fiber 30 is buried in the light receiving section 31 of the optical fiber 30 without any gap.

Next, a method of forming the light receiving surface 20 will be described with reference to FIGS.
This will be described with reference to FIG. An end portion of the optical fiber 30 formed of glass, plastic, or the like is heated in advance to have a shape having a corner 310. The corner 310 is formed in a range of the length L to be the light receiving section 31. The light receiving portions 31 of the plurality of optical fibers 30 are bundled and bound by the frame plates 50 and 60. At this time, the optical fibers 30 are bundled with the corners 310 at the horizontal position. Then, by applying pressure from above and below via the frame plate 60, each optical fiber 30
Is shaped into a hexagonal shape.

In the projection device configured as described above, the light projected from the projector 10 to the light receiving unit 20 enters the light receiving unit 31 without loss, and is transmitted through the optical fiber 30.
The light that reaches the other end face and is received emits light in the light emitting unit 35. The light emitting section 35 of the optical fiber 30 is
0 is supported by the support portion. The projection panels 40 are arranged at appropriate intervals according to the enlargement ratio, and an enlarged image can be obtained by the light emission of the light emitting unit 35. As a method for changing the cross-sectional shape from a circular shape to a regular hexagonal shape, there are a method using elastic deformation of the fiber, a method using plastic deformation of the fiber, and a method using both of them.

[0009]

According to the projection apparatus using the optical fiber of the present invention, the light receiving area efficiency in the light receiving section can be improved to nearly 100%, and a bright image can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an arrangement of optical fibers in a light receiving unit.

FIG. 2 is an overall explanatory diagram of the projection device.

FIG. 3 is a perspective view of a light receiving section of the optical fiber.

FIG. 4 is an explanatory diagram of formation of a light receiving surface.

FIG. 5 is an explanatory view of an arrangement of optical fibers of a conventional light receiving unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Projector 20 Light-receiving surface 30 Optical fiber 31 Light-receiving part 33 Element wire 35 Light-emitting part 310 Corner part

Claims (1)

[Claims] 1. A projection apparatus comprising an optical fiber having a projector, a light receiving section and a light emitting section for transmitting received light to emit light, wherein the optical fiber has at least a polygonal cross section of the light receiving section. A light receiving surface configured to receive light projected from the projector by bundling light receiving portions of a plurality of optical fibers, wherein the light receiving surface is configured such that no gap is formed between adjacent light receiving portions.