JPH01303422A - Original reader - Google Patents

Abstract

PURPOSE:To reduce the number of parts and to cut down cost by constituting an armor part in the vicinity of a slit of a reflecting member of specific color. CONSTITUTION:In an optical system unit 3, a reflector 32 made of metal and the like is fixed to the lower part of the reflecting member 31 subjected to resin molding, and a light source lamp 33 is inserted therein laterally. The reflecting member 31 is molded so as to fill in the opening part 11 of the armor 1, and fixed to the armor 1 by a machine screw. The member 31 is also colored in white which has a high light reflectance. Since the identical reflecting member 31 is always used regardless of the color of the armor 1 of a copying machine main body, every machine has the same light quantity. As result, the number of parts can be reduced to cut down costs.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to document reading devices such as electronic copying machines and facsimiles, and particularly to improvements in the optical system portion thereof.

(b) Prior Art Some electrophotographic copying machines, facsimile machines, and the like have been designed so that the exterior color can be selected from red, blue, or any other color in order to personalize the machine.

FIG. 3 is a cross-sectional view of the vicinity of the optical system of a conventional copying machine with a movable document table. 54 was exposed to light, and the reflected light was guided to a photoreceptor (not shown).

As described above, the color of the exterior 51 can be selected from any color such as red or blue.

(C) Problems to be Solved by the Invention However, the amount of reflected light (energy) of light differs depending on the color, and as mentioned above, if the color of the exterior 51 can be arbitrarily selected, the reflection by the exterior for each copying machine machine is possible. The amount of light will be different. Light reflected by the exterior (stray light, etc.) may be repeatedly reflected and expose the original, or may directly enter the optical sensor in a copying machine equipped with an optical sensor 55 for detecting the density of the original. The color affects the amount of light reflected from the original and the density of the original detected by the optical sensor 55. The amount of light reflected from the original and the density of the detected original are greatly related to the quality of the image formed, and for this reason, conventionally, it has been necessary to adjust the control circuit of the light source lamp and the like according to the color of the exterior.

Furthermore, as shown in FIG. 3, it is conceivable to provide a light control plate 56 on the side of the exterior 51 to eliminate the difference in light amount depending on the color of the exterior 51, but this method requires a large number of parts.・
There was also the problem of waste.

An object of the present invention is to provide a document reading device that solves the above problems by improving the exterior portion and the optical system portion.

(Means for Solving Problem d1) This invention provides an original reading device in which the exterior can be selected from any color in one dimension and is equipped with an optical system for exposing the original to a slit inside the exterior. It is characterized by being constructed from colored reflective members.

Further, the exterior portion having the specific color may be integrated into the optical system.

+01 Effect In this invention, the exterior color near the slit is set to a specific color, and the exterior color is, for example, red.

Even if it differs from machine to machine, such as blue, there will be no difference in the amount of light reflected near the slit. Therefore, it is possible to prevent the influence of the selected exterior color on the amount of reflected light on the document and the amount of light incident on the optical sensor.

Furthermore, by integrating an exterior with a specific color into the optical system, it can be easily assembled by simply attaching the optical system unit to exteriors of various colors.

(f) Embodiment FIG. 1 is a sectional view of the vicinity of the optical system of a copying machine which is an embodiment of the original reading apparatus of the present invention, and FIG. 2 is a plan view of the copying machine.

The exterior of the copying machine body is molded from resin, and is colored in any color such as red or blue. Arrow F is on the -L part of the exterior part.
, a document table 2 movable in directions R is provided. The original platen 2 is made of transparent glass or the like, and the original to be copied is placed on it.The direction of movement of the original platen 2 (F, I?
An opening 11 is formed approximately at the center in the force direction, and the optical system unit 3 is disposed in this opening 11. The same optical system unit 3 is used regardless of the color of the exterior part.

The optical system unit 3 includes a reflector 32 made of metal or the like fixed to the lower part of a resin-molded reflective member 31, and a light source lamp (fluorescent lamp) 33 inserted into the reflector from the side. 4, 131 is molded so that it can be fitted into the opening 11 of the exterior part, and is fixed to the exterior part with screws 34. Further, the reflective member 31 is colored, for example, white with high light reflectance, and a light source lamp 33 is provided in the center of the reflective member 31.
An exposure opening 31a is formed along. Original table 2
The upper document is exposed by the light source lamp 33 through the exposure opening 31a.

The reflector 32 is provided with a reflection plate (not shown) on a part of its inner surface, and reflects the light from the light source lamp 33 to focus the light on the document on the document table 2 . As shown by the dotted chain line in the figure, the light from the light source lamp 33 not only directly exposes the document, but also shines through the reflector 3.
The original is exposed to light reflected by the reflective member 3.
1 and reflected by the reflector 32, the original f+:″S
to expose. However, since the same reflective member 31 (white) is always used regardless of the color of the exterior of the copying machine body, there is no difference in the amount of light depending on the machine base.

A slit 32a is formed along the light source lamp 33 on the bottom surface of the reflector 2332, and a light convergence transmitter 4 is disposed below the slit 32a, so that the reflected light from the original is guided to a photoreceptor (not shown) by the light converge transmitter 4. It will be destroyed. Further, an opening 32 is formed in the side surface of the reflector 32, and the optical sensor 5 is disposed outside the opening 32. The optical sensor 5 is a sensor that detects the density of the original, and receives reflected light from the original and light reflected by the reflecting member 31, and detects the amount of light. Although the light incident from the reflective member 31 causes an error in detecting the density of the original, the amount of light that enters the optical sensor 5 from the reflective member 31 can be predicted, and if the density detection circuit is configured based on this amount of light, the density of the original can be determined. Can be detected accurately. If the reflective member 31 is made to have a specific color as in this embodiment, there is no need to set the density detection circuits individually depending on the color of the exterior of the copying machine body.

(g) Effects of the Invention As described above, according to the present invention, the exterior color of the Surin I and its vicinity is set to a specific color, and the reflected light of the document and the incident light of the light sensor can be adjusted to a specific color without the need for a special light control plate. The number of parts can be reduced because the light, etc. can be kept constant, and there is no need to adjust the control circuit of the light source lamp depending on the exterior color, so assembly and adjustment time can be reduced, reducing the total cost. There are advantages that can be achieved.

Also, if you integrate the exterior with a specific color into the optical system, you can
It has the advantage that it can be easily assembled by simply attaching the optical system unit to a color-colored exterior, making standing work even easier. Additionally, since the optical system is visible on the exterior, maintenance is also easier.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an optical system device of a copying machine with a moving document table as an embodiment of the document reading apparatus of the present invention, and FIG. 2 is a plan view of the copying machine. Further, FIG. 3 is a sectional view of an optical system device of a conventional copying machine with moving document table. 1-Exterior of compound machine main body, 3-Optical system unit, 5-Optical sensor, 31-Reflecting member, 32-Reflector, 33-Light source lamp.

Claims (2)

[Claims] (1) A document reading device in which the exterior can be selected in any color and is equipped with an optical system for exposing the document to a slit inside the exterior, characterized in that the exterior near the slit is made of a reflective member of a specific color. Manuscript reading device. (2) The document reading device according to claim 1, wherein the exterior portion having the specific color is integrated into an optical system.