JPS61100073A - Method of illuminating reading optical system - Google Patents

Abstract

PURPOSE:To enhance the intensity of illumination in the part of reading and read clear characters and pictures by providing a light waveguide path adjoining both sides of a reading light waveguide path, and making illumination for reading an original through the light waveguide path for illumination. CONSTITUTION:Light waveguide paths for illumination are provided by adjoining both sides of a light waveguide 2 for reading. Light emitted from a light source 4 irradiates an original 1 through a light waveguide path 3 for illumination without escaping to the outside as the light source 4 is covered by a reflector 5. In this case, as the part near the light waveguide path 2 for reading is illuminated, the depth of characters and pictures of the original 1 is projected clearly, and the light is received efficiently by a reading sensor 6 through the light waveguide path 2 for reading.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an illumination method for a reading optical system, and particularly to an illumination method suitable for a reading optical system used in facsimiles and the like.

[Background of the invention]

For various optical systems of conventional facsimiles, 0,
This is discussed in a document titled ``Application of micro-optics to facsimile J'' by Mr. Komiya in Plug E, No. 50 (January 1984). A conventional example of the reading optical system in the document is shown in FIG. In FIG. 2, reference numeral 11 denotes a manuscript. In order to read the manuscript 11, a light source 12 is used to illuminate the manuscript 11, and the contents of the JJK manuscript 11 are photoelectrically converted and read by a reading sensor 14 through a lens 13.

In this conventional reading optical system, for example, a fluorescent lamp or an LED light emitting element is used as the light source 12 for illumination, and the light g12 of 29 is used for direct illumination. Due to the large size, 1ll (draft 11)
Therefore, the light from the light source 12 cannot be effectively irradiated onto the reading section, and the shading of the characters or images on the original s11 becomes weak, making it difficult to read clearly. The drawback was that it was not possible. Furthermore, since the optical WX12 is large, there is also a drawback that the entire reading optical system becomes large.

[Purpose of R-ming]

The present invention has been made in view of the above, and its purpose is to provide an illumination method for a reading optical system that can increase the illuminance of the reading part of a document and also that can reduce the structure of the optical system. It is about providing.

[Summary of the invention]

A feature of the present invention is that illumination optical waveguides are provided adjacent to both sides of the reading optical waveguide of the reading optical system, and illumination for reading the Jul of the reading optical system is performed through the illumination optical waveguides. At the point.

[Embodiments of the invention]

An embodiment of the method of the present invention will be described in detail below with reference to FIG.

FIG. 1 is a sectional view showing an example of an apparatus for explaining an embodiment of the illumination method for a reading optical system according to the present invention. Second
In the figure, 1 is an original, and 2 is a reading optical waveguide, which is arranged in a T-shape with the original 1, forming a rectangular parallelepiped. 3 is an illumination optical waveguide provided on both sides of the reading guide waveguide 2, and 4 is a light source for illuminating the illumination optical waveguide 3.

The light sources 4 are provided at the ends of the illumination optical waveguides 3 provided on both sides, and a reflector 5 is provided around each light source 4.
This is to prevent light from escaping to the outside. 6
A reading sensor receives light emitted from the reading optical waveguide 2 and photoelectrically converts the contents of the document 1 to read it, and 7 is a reading device made up of the various parts described above.

, In the above construction, the light emitted from the light source 4 is the light source ′
4 is covered with a reflector 5, the light passes through the illumination optical waveguide 3 and is irradiated onto the document I without escaping to the outside. In this case, since the portion close to the reading guide waveguide 2 is illuminated, the shading of the characters or screen of the original 1 is clearly displayed, and the light passes through the reading optical waveguide 2 and is efficiently received by the reading sensor 6. .

According to the embodiment of the present invention, since the relatively simple illumination optical waveguide 3 illuminates the portion of the document 1 near the reading optical waveguide 2 on J7, the illuminance of the reading portion of the document 1 can be increased. , and the reading device can be downsized.

The reading optical waveguide 2 and the illumination optical waveguide 3 in FIG. 1 may be guided waveguides made of glass or plastic, and the refractive index of these optical waveguides 2. There is no difference in the effect even if it is. Moreover, the light source 4 is.

It goes without saying that multiple LED light sources or small fluorescent lamps can be used.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to increase the illuminance of the reading part of a document, read clear characters and images, and downsize the structure of the optical system. There is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a device for explaining an embodiment of the illuminance method for a reading optical system according to the present invention, and FIG. 2 is a schematic configuration diagram of a conventional reading optical system. DESCRIPTION OF SYMBOLS 1... Original, 2... Reading guide waveguide, 3... Optical waveguide for illumination, 4... Light source, 5... Reflector, 6...
・Reader (1 other person)

Claims (1)

[Scope of Claims] 1. In a reading optical system in which a reading optical waveguide is provided between a document and a reading sensor, illumination optical waveguides are provided adjacent to both sides of the reading optical waveguide, and the illumination optical waveguide is An illumination method for a reading optical system, characterized in that illumination for reading the document is performed via a wave path. 2. The illumination method for a reading optical system according to claim 1, wherein the illumination optical waveguide is provided with a light source and a reflector.