JPS61293060A - Color original reader - Google Patents

Abstract

PURPOSE:To improve the resolution of a device equipped with a striped color filter film by assigning respective colors to picture elements of a sensor corresponding to divisions of the color filter. CONSTITUTION:When color filters R, G, and B are used, the color filters of R, G, and B are mounted dividing the sensor 5 into three and the sensor 5 itself is moved in the 2nd subscanning. An original 1 is moved by one-third as long as the sensor length and image signals obtained from the sensor 5 are classified according to the correspondence to the color filters and then processed. Respective color signals of the original are obtained by using all picture elements of the sensor 5 and the resolution is improved by three times.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a reading device for reading image information of a document or the like by separating it into a plurality of colors.

[Prior art and its problems]

2. Description of the Related Art As this type of document reading device, one is conventionally known that reads a document by bringing the document into close contact with a sensor provided with a striped color filter film.

FIG. 5 is a cross-sectional view of the main parts of the conventional device, FIG. 6(a) is a perspective view of the sensor board, FIG. 6(b) is a view taken along arrow B, and FIG. 6(C) is a color filter film. It is a conceptual diagram.

In this configuration, the document 1 set on the upper part of the housings 2a, 2b is moved one pitch (sub-scanning) in the direction of the arrow (or in the opposite direction) by a drive mechanism (not shown). A fluorescent lamp 3 and a SELFOC lens 4 are provided in the housings 2a and 2b, and the light emitted from the fluorescent lamp 3 and reflected by the document 1 is irradiated onto the sensor board 5 via the SELFOC lens 4. be done. For example, an image sensor is provided on the sensor board 5, and the original 1 is read by scanning (main scanning) along the dotted line in FIG. 6 (al) by the sensor drive circuit 6. The original 1 moves one pitch (sub-scanning) in the arrow direction (or the opposite direction).The image signal obtained in the main scanning is divided into red (main), blue (B), and green (q) and processed.

However, in a document reading device using such a striped color filter film, as shown in FIGS. 6(b) and 6(c), JB,
Since the G color filter 8 is installed, there is a drawback that the resolution is reduced to 1/3 compared to a monochrome original reading device.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a color document reading device that achieves the same resolution as a monochrome document reading device.

[Key points of the invention]

In this invention, for example, when using R, G, and B color filters, the sensor is divided into three parts.

G color filter is attached, and the sensor itself is also moved (first sub-scanning) of the moving unit 2, and the document is moved (first sub-scanning) by 1/3 of the sensor length, and the image obtained from the sensor is The signals are classified and processed according to their correspondence with the color filters.

[Embodiments of the invention]

FIG. 1 shows a conceptual diagram of the operation of a document reading device according to an embodiment of the present invention. In the figure, the dotted line (A) indicates main scanning, and the arrow (+
:]) represents the direction of the first sub-scanning, and the arrow (C) represents the direction of the second sub-scanning.

FIG. 2 shows the configuration of the color filter film 8 and the sensor substrate 5 according to the embodiment of the present invention. The configurations viewed from a plane parallel to - are shown respectively.

FIG. 3 is an explanatory diagram of the operation of the document reading apparatus according to the present invention.

In such a configuration, when the positional relationship between the document 1 and the sensor 5 is as shown in FIG. 3(a), neither the main scan nor the second sub-scan is performed, but the first sub-scan is performed, 5 becomes as shown in FIG. 3(b), a second sub-scan is performed while repeating the main scan, and the area indicated by R on the original 1 is read through the color filter R. Thereafter, similarly, the first sub-scanning is shown in FIGS. 3(C) and 3(d).

The second scan is performed in the same order as (e), and the main scan is repeated.
sub-scanning is performed. In addition, in FIG. 3, the areas indicated by R, , B, and G on the original 1 indicate the areas that are read through the color filter 80) R part, B part, and G part, and (f(),
(B+, (('The area indicated by l is already the R part of the color filter 8.

Indicates that the area is read through part B and part G.

On the other hand, the image signal obtained by main scanning of the sensor 5 is a serial signal, which is a series of signals read through the R section of the color filter 8, and a series of signals read through the B and G sections of the color filter 8. Become. Since the dimensions of the color filter 8 and the correspondence relationship with the sensor 5 are determined mechanically, the image signal from the R section of the color filter 8 and the (
It is known in advance that the (n+1)th to mth image signals are image signals from the B section, and the (m-1-1)th and subsequent image signals are image signals from the G section. Therefore, a counter (not shown) is provided to count the number of sensor outputs due to main scanning, and the nth and mth sensor outputs are detected and an analog switch (not shown) is switched. to a circuit (not shown) for processing the color signal.

FIG. 4 shows a schematic configuration diagram of a document reading device according to another embodiment of the present invention, in which the document 1 and the sensor 5 do not come into close contact with each other, and the light reflected by the mirror 9 is reduced by the optical lens 10. The sensor 5 is designed to obtain an image of the original 1, which has the advantage that the sensor 5 can be made smaller. In addition, in this configuration, the color filter film 8 is not attached to the sensor 5;
The beam can be provided at any position on the optical path 11 (for example, on the mirror 9).

In the above embodiment, reading of three colors has been described, but the present invention can also be applied to reading of two colors such as red and black, or reading of four or more colors.

In this invention, one sensor is used differently by attaching color filters, but it is also possible to configure a composite image sensor by arranging multiple dedicated sensors for each color with the main scanning direction aligned. Okay).

〔Effect of the invention〕

According to this invention, the sensor itself is moved using the second sub-scan, and the color filter is roughly divided into three parts.
Since the sensor pixels are configured to be reassigned to each color in accordance with the division of the color filter, all of the sensor pixels can be used to obtain each color signal of the document, increasing the resolution by three times. . Furthermore, since the color filters are divided into large sections, the structure of the color filters is simplified and manufacturing becomes easier.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of the operation of a color document reading device according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a sensor used in the present invention, and FIG. 3 is an operation diagram of a color document reading device according to an embodiment of this invention. 4 is a schematic configuration diagram of an apparatus according to another embodiment of the present invention, FIG. 5 is a sectional view of a main part of a conventional contact-type color document reading device, and FIG. 6 is a schematic diagram of a device used in the conventional device. A schematic configuration diagram of a sensor is shown. 1... Original, 2a, 2b... Housing, 3...
Fluorescent lamp, 4... Selfoc lens, 5... Sensor board, 6... Sensor drive circuit, 7... Color filter, 8... Filter film, 9... Mirror, 10...
... Lens, 11... Optical path O Fire-eared patent attorney Satoshi Yamaguchi (Ro) Sai 1 figure (D)? Figure 2 (θ) (b) (
C) (c (e)
N1=3(2)

Claims (1)

[Scope of Claims] 1) A light-receiving sensor that is irradiated with the reflected light from the document and a light-receiving sensor located at any position on the optical path until the reflected light reaches the light-receiving sensor in the same direction as the main scanning direction of the light-receiving sensor. a plurality of color filters necessary for color separation of images arranged in the same direction; means for repeatedly moving the light receiving sensor and the color filters in a direction forming a constant angle with the main scanning direction; A color document reading device characterized by comprising: means for moving the color filter every predetermined number of pitches in the direction; and means for dividing the output signal of the light receiving sensor into each color signal and processing each color signal. . 2) A color document reading device according to claim 1, characterized in that a plurality of light receiving sensors each having the color filter are arranged so that their main scanning directions coincide with each other.