JPH05160954A - Original reader - Google Patents

Abstract

PURPOSE:To miniaturize the entire original reader by reducing one mirror at the original reader using a reduced optical system. CONSTITUTION:One part of a reading glass plate 13 pressurized to a white platen roller 1 is worked into a mirror 13a and used as one mirror. An original 5 is irradiated with light from a light source 3 through the reading glass plate 13. Reflected light for one line of original width is passed through the reading glass plate 13 and returned on a first mirror 6 and the mirror 13a worked on the reading glass plate 13 and after the light is reduced by a lens 4, an image is formed on the surface of a ccd sensor 8a. Thus, one mirror can be economized in comparison with the conventional product, and the original reader can be entirely miniaturized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading device used in a facsimile machine or the like.

[0002]

2. Description of the Related Art In a document reading apparatus used in a facsimile machine, a reduction optical system using a ccd sensor and a lens,
It is roughly classified into an equal-magnification optical system using a contact sensor. Although the reduction optical system is lower in cost than the equal-magnification optical system, it uses a lens and thus requires an optical path length from the document surface to the ccd sensor, which has a drawback that the entire configuration becomes large. For this reason, it is generally practiced to use a mirror to fold the optical path to make the entire structure smaller.

A conventional document reading apparatus will be described below. 3 is a plan view of a conventional document reading apparatus, and FIG. 4 is a sectional view taken along the line BB of FIG. The conventional document reading device is arranged on a white platen roller 1, a transparent reading glass plate 2 in pressure contact with the white platen roller 1, a light source 3, a lens 4, and an optical path between the document 5 and the lens 4. The first mirror 6
And the second mirror 7, the ccd substrate 8 to which the ccd sensor 8a is fixed, the reading glass plate 2, the light source 3, the lens 4, the first and second mirrors 6, 7, ccd.
An optical chassis 9 for holding the substrate 8 and a document detection sensor 10
And an upper guide 11 and a lower guide 12 that guide the document 1.
It has and.

The operation of the document reading apparatus configured as described above will be described below. Document 5 is upper guide 11
When the document is inserted into the conveyance path composed of the lower guide 12 and the lower guide 12, the document detection sensor 10 detects the insertion of the document 5, turns on the light source 3, and drives the white platen roller 1 by a drive source (not shown). Rotate in the direction of arrow a. The white platen roller 1 bites the leading edge of the original 5, feeds a fixed amount of paper to the reading position along the reading glass plate 2, and then stops. When the start button is pressed in this state, the white platen roller 1 feeds the paper and starts the reading operation. The reflected light corresponding to one line of the document width passes through the reading glass plate 2 and is reflected by the first mirror 6 and the second mirror 7, reduced by the lens 4, and then focused on the surface of the ccd sensor 8a. The ccd sensor 8a converts black and white image information for one line of the original document into an electric signal.

[0005]

However, in the above-mentioned conventional structure, the number of mirrors must be increased in order to reduce the size of the entire apparatus, which is costly, and the volume occupied by the mirror is large, which is against the miniaturization. was there.

The present invention solves the above problems, and an object of the present invention is to provide a document reading apparatus which can be reduced in overall size.

[0007]

In order to solve the above problems, the present invention enables a part of the ccd sensor side surface of the reading glass plate used in the document reading section to be a mirror surface so that it can be used as a single mirror. It is the one.

[0008]

With the above construction, since the mirror and the reading glass plate are integrated, the number of parts is reduced, and as a result, the entire document reading device can be made small.

[0009]

1 is a sectional view of an original reading device according to an embodiment of the present invention, FIG. 2 is a plan view of the original reading device, and FIG. 1 is a sectional view taken along the line AA of FIG. The white platen roller 1, the light source 3, the lens 4, the original 5, the first mirror 6, the ccd sensor substrate 8 to which the ccd sensor 8a is fixed, the optical chassis 9, the original detection sensor 10,
Since the upper guide 11 and the lower guide 12 have the same functions as the conventional ones, the same numbers are given and the description thereof is omitted.

As shown in FIGS. 1 and 2, a part of the surface of the transparent reading glass plate 13 on the side of the ccd sensor 8a is a mirror surface 13.
a, and the second mirror that has been conventionally provided is omitted accordingly.

The operation of the document reading apparatus constructed as above will be described. When the document 5 is inserted into the conveyance path, the document detection sensor 10 detects it, turns on the light source 3, and rotates the white platen roller 1 in the direction of arrow a by a drive source (not shown). White platen roller 1 is original 5
The front end of the sheet is bitten, a certain amount of paper is fed to the reading position along the reading glass plate 13, and then stopped. When the start button is pressed in this state, the white platen roller 1 feeds the paper and starts the reading operation. The reflected light for one line of the document width is reflected by the first mirror 6 along the reading glass plate 13.
Mirror surface 13 folded on and processed on the reading glass plate 13
After being further folded back at a and reduced at lens 4, cc
An image is formed on the surface of the d sensor 8a. The ccd sensor 8a converts black and white image information for one line of the document width into an electric signal.

With the above structure, the second mirror can be omitted as compared with the conventional one, and the length L1 of the document reading device becomes shorter than the length L2 of the conventional document reading device (see FIG. 4). Therefore, the entire device can be downsized.

[0013]

As described above, according to the present invention, a part of the ccd sensor side surface of the reading glass plate used in the document reading portion is made into a mirror surface so that it can be used as one mirror. Not only can one mirror be saved as compared with the document reading apparatus described above, but the length of the document reading apparatus can be shortened and the overall configuration can be downsized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view (a view taken along the line AA of FIG. 2) of a document reading apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of the document reading apparatus.

FIG. 3 is a plan view of a conventional document reading device.

FIG. 4 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 1 White Platen Roller 3 Light Source 4 Lens 5 Original Document 6 First Mirror 8 ccd Sensor Board 8a ccd Sensor 9 Optical Chassis 13 Reading Glass Plate 13a Mirror Surface

Claims (1)

[Claims] 1. A white platen roller for conveying a document, a drive source for the white platen roller, a transparent reading glass plate in pressure contact with the white platen roller, and a light source for illuminating the document surface through the reading glass plate. At least one mirror that returns the reflected light from the document surface, a lens that optically reduces one line of the document, and a photoelectric conversion ccc
A manuscript provided with a ccd substrate having a sensor and an optical chassis for holding the reading glass plate, a light source, a mirror, a lens, and a ccd substrate, and using a part of the surface of the reading glass plate as a mirror surface as one of the mirrors. Reader.