JPS60180275A - Optical guide path - Google Patents

Abstract

PURPOSE:To improve the reading high resolution and high reliability by inserting a light shield layer having a transparent window between a multi-fiber and a support member. CONSTITUTION:Lighting luminous fluxes 5A, 5B coming externally pass through supports 2A, 2B, reach the multi-fiber 3 via transparent window sections 8A, 8B of light shield layers 7A, 7B, transmit the multi-fiber 3 and lights up a recording face 1. Reflected lights 5A, 5B from the recording face 1 are led to adjacent individual optical fibers of the multi-fiber 3 via a lower end face 4B of the multi- fiber 4, and reach a upper end face 4A of the multi-fiber 3 through the optical fiber. Thus, the image information of a part opposite to the multi-fiber 3 on the recording face 1 is led to the upper end face 4a of the multi-fiber 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to an optical waveguide used in a device for photoelectrically converting and reading image information such as documents and images.

[Background of the invention]

As shown in FIGS. 1 and 2, a conventional optical waveguide of this kind has a support 2 on the surface 1 (hereinafter referred to as the recording surface) of a document on which image information such as a document and an image is recorded.
It consists of a structure in which optical fiber portions 3 are welded or adhesively held to 'A, 2' and B and are placed opposite each other. This optical fiber section 3 has a plurality of optical fibers bundled so that their optical axes are parallel to each other and arranged in parallel, and has upper and lower end surfaces 4A.

4B is configured in a flat plate shape. Further, the support body 2'
A and 2'B have light shielding layers 2'Aa on the side and bottom surfaces opposite to the optical fiber section 3, respectively.

2'Ba, 2'Ab, and 2'Bb are formed.

The recording surface 1 is illuminated by illumination light 5 that traverses the supports 2'A, 2'B and the optical fiber section 3. The reflected light 5A from the recording surface 1 of the illumination 5 passes through the lower end surface 4B of the optical fiber portion 3 and is transmitted to the adjacent individual optical fibers 3A.
The upper end surface 4A of the optical fiber section 3
leading to. In this way, the recording surface 1 facing the lower end surface 4B
After the upper image, information (not shown), etc. are guided to the upper end surface 4A, they are converted into electrical signals by photoelectric conversion means (not shown).

In this case, stray light 6A, 6B from the sides of the supports 2'A, 2'B and stray light 7C from above the support 2'A are blocked by the light shielding layers 2'Aa, 2'Ba and 2'Ab, respectively. Therefore, the light shielding layer 2'Aa, 2
'Ba, 2' Ab serves to improve the contrast of the image in the portion of the upper end surface 4A facing the optical fiber portion 3 on the recording surface 1. However, the light shielding layer 2
' A a y 2 ' Ba is exposed to the outside, and the light-shielding layers 2' Ab and 2' Bb face the recording surface 1, so they are susceptible to wear and damage. Furthermore, since there is a step between the lower end surface 4B of the optical fiber section 3 and the lower end surfaces of the light shielding layers 2'Ab, 2'Bb, there is a risk that dust may adhere to this part or peeling may occur. There are some drawbacks that make it unusable.

[Purpose of the invention]

An object of the present invention is to provide an optical waveguide that improves the resolution and reliability of reading in an image information reading device.

[Summary of the invention]

In order to achieve the above object, the present invention provides a multi-fiber in which a plurality of optical fibers are bundled so that their optical axes are parallel to each other and arranged in parallel, and a multi-fiber that is held from both sides. It consists of a supporting member,
In a fiber array plate in which one of the flat upper and lower end surfaces of the multi-fiber is deflected and closely attached to the document surface and the other photoelectric sensor surface, the optical axis of the multi-fiber is perpendicular to the upper and lower end surfaces, and , a light-shielding layer having a transparent window is interposed between the multi-fiber and the supporting member, or the supporting member is constituted by a light-shielding body, and the illumination light beam is directed to the multi-fiber within the supporting member. It is characterized by having a passage for introduction.

[Embodiments of the invention]

Embodiments of the guiding waveguide of the present invention will be described below with reference to the drawings. 3 and 4 are a perspective view and a sectional view of one embodiment, and FIG. 5 is a sectional view of another embodiment.

In Figures 3 to 5, ■ indicates a document (recording surface) on which image information such as documents and images is recorded;
, 2B are connected to the optical fiber section 3 (
This is a support that holds both sides of the multi-fiber (hereinafter referred to as multi-fiber).

The light-shielding layers 7A and 7B are made of a light-absorbing material, are welded or connected to the multi-fiber 3 and the supports 2A and 2B, and have transparent windows 8A and 8B, respectively.

The multi-fiber 3 has a plurality of optical fibers bundled so that their optical axes are parallel to each other and arranged in parallel, and has upper and lower end surfaces 4A.

4B is formed into a flat plate shape. The lower end surface 4B is of course the lower end surface 7Aa of the light shielding layers 7A and 7B.

The lower end surfaces of 7Ba and the supports 2A and 2B are provided so as to maintain a small gap from the recording surface 1.

Next, the operation of this embodiment configured as described above will be explained.

As shown in FIG. 4, the illumination light fluxes 5A and 5B from the outside are
It passes through the supports 2A and 2B, then passes through the transparent windows 8A and 8B of the light shielding layers 7A and 7B, and reaches the multi-fiber 3.
Further, the light passes through the multi-fiber 3 and illuminates the recording surface 1.

The reflected lights 5Aa and 5Ba from above the recording surface 1 pass through the lower end surface 4B of the multi-fiber 4 to the multi-fiber 3.
is introduced into adjacent individual optical fibers, and passes through these optical fibers to reach the upper end surface 4 of the multi-fiber 3.
Leading to A. In this way, the image information on the portion of the recording surface 1 facing the multi-fiber 3 is guided to the upper end surface 4A of the multi-fiber 3, and then the image information is converted into an electrical signal by a photoelectric conversion means (not shown). can do.

FIG. 5 shows another embodiment, in which supports 2A, 2
+3 is provided in the illumination light flux path 9A.

The groove is formed by a light-shielding material that absorbs all light except 9B,
In addition to blocking stray light, the light shielding layer 7A
, 7B (see Figure 4) was abandoned in the first embodiment (
3 and 11), the other structures are the same, so a description thereof will be omitted.

This configuration has the advantage of improving assembly.

〔Effect of the invention〕

As explained above, according to the present invention, the light-shielding layer and the support made of the light-shielding material do not come into contact with the surface of the document, so that wear and damage to the light-shielding layer and the support are prevented, and the reliability of the device is improved. be able to. Furthermore, since stray light can be completely blocked, resolution can be improved.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a sectional view of a conventional optical waveguide, FIGS. 3 and 4 are a perspective view and a sectional view of a guiding waveguide of the present invention, and FIG. 5 is a perspective view and a sectional view of a conventional optical waveguide. FIG. 3 is an example cross-sectional view. ■...Document surface, 2A, 2B...Support, 3...Multi fiber, 4A, 4B...Top and bottom end surfaces, 7A,
7'B... Light shielding layer, 8A, 8B... Transparent window section, 9
A, 9R nest 1 Figure nest 2 Figure 'fJ3 day

Claims (1)

[Claims] 1. A multi-fiber made by bundling a plurality of optical fibers so that their optical axes are parallel to each other and arranging them in parallel, and a support member that holds the multi-fiber from both sides, respectively. In a fiber array plate in which one of the flat upper and lower end surfaces of the multi-fiber is brought into close contact with the document surface and the other is brought into close contact with the photoelectric sensor surface, the optical axis of the multi-fiber is perpendicular to the upper 5 lower end surfaces. An optical waveguide characterized in that a light shielding layer having a transparent affected area is interposed between the multi-fiber and the supporting member. 2. A multi-fiber made by bundling a plurality of optical fibers so that their optical axes are parallel to each other and arranging them in parallel; In the fiber array plate, one of the flat upper and lower end surfaces of the fiber is closely attached to the document surface and the other to the photoelectric sensor surface.
The optical axis of the multi-fiber is above the optical axis. An optical waveguide, characterized in that the support member is made of a light shielding member and is perpendicular to the lower end surface, and a passage is provided in the support member for introducing an illumination light beam to the multi-fiber.