JPS60125528A - Reader - Google Patents

Abstract

PURPOSE:To obtain a reproduced picture having a hue which corresponds accurately to the hue of a read picture, by arranging a film body having a neutral density corresponding to the color of a color separating filter on the color separating filter given to each picture element part of a light receiving part. CONSTITUTION:Illuminating light is irradiated from a light source 2 to a read original placing table glass 1 on which the read original is placed with the surface turned down, and the image of this original is formed in a photodetector part 5 through an optical system 4. The photodetector part 5 consists of an infrared light-reflective film 10, a glass plate 8, a film body 9 having a neutral density corresponding to the color of each filter 7 in the position corresponding to the filter 7, filtes 7 of C, Y, and W given in accordance with individual picture elements of a photosensor 6, and the photosensor 6. The neutral density of the film body 9 is determined on the basis of a ratio of the output of each picture element part corresponding to C, Y, or W which is obtained when a white picture is read.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a reading device, particularly a color reading device.

[Conventional technique ml]

2. Description of the Related Art Conventionally, a CCD photosensor array using crystalline silicon as a light receiving element has been used in a photoelectric conversion device for image signal processing used in processing image information. Although this CCD photo sensor array has many advantages, especially when trying to increase the pixel intelligence and achieve high resolution, the size of each pixel portion becomes smaller, so each pixel portion is covered with a lid. The problem is that the amount of charge that can be accumulated is limited, resulting in low sensitivity.

Incidentally, in recent years, in image information processing, it has been desired to process not only a gray scale image of a polar bear but also a color Ii image.

Such color image information processing is particularly implemented in reading devices in the field of color copying and the like. That is, by treating a plurality of adjacent pixel parts (usually three pixel parts) as one block and applying a color separation filter of a different color to each pixel in each pixel block, a color separation spectrum can be obtained from each pixel block. A plurality of signals are obtained, which are processed by appropriate electrical means and output. In this way, in a color image reading device, one pixel block corresponds to one pixel portion of black and white image information in terms of resolution.

Therefore, in order to improve the resolution in color image reading, the size of each W4J element part must be made much smaller. Further, if an image pickup tube filter (yellow, cyan, green) is used as it is as a color separation filter, there may be a large difference in the energy amount of each color separation spectrum depending on the tone of the read image.

Therefore, in color image reading equipment, the above COD
When using a photosensor array as a light-receiving element, each color separation output signal often does not accurately correspond to the incident light spectrum to each pixel, and therefore, when an image is reproduced based on the output signal, the color tone may vary. It was easy to occur.

[Object of the present invention]

The present invention is based on the above-mentioned prior art and aims to realize an output that allows the color reading device 11 to obtain a reproduced image with a tone that accurately corresponds to the tone of the read image.

Such an object is achieved by arranging film bodies having different neutral concentrations corresponding to a plurality of pixel portions in each pixel block of the light receiving element.

[Example of the present invention]

FIG. 1 is a schematic diagram of a reading device according to the present invention. Here, in 1, the table for placing the read original is a lath, and the read document is placed on the lath 1 with the image information side facing downward. 2
3 is a light source for illumination, and 3 is a reflective shade. A four-piece assembly is a selfoc lens array coupling optical system arranged below the lath 1, and 5 is a light receiving element section arranged below the optical system 4. Light source 21 reflective shade 3. The optical system 4 and the light receiving element section 5 are integrated so that the base is moved in parallel relative to the lath 1, so that the illumination light is reflected on the document surface, and the reflected light is reflected by the optical system 4. The image is formed on the light-receiving element section 5, and the 1irIl image information on the original surface is read from this image.

FIG. 2 is a plan view showing a photosensor array and a color separation filter that constitute the light receiving element section 5. As shown in FIG. That is,
A conventionally used COD 7 photo sensor 6 has a large number of pixel parts arranged in a row, and a color separation filter 7 is arranged on each pixel part. The filter 7 is arranged repeatedly in the order of cyan (C), yellow (Y), and white (W) for each block, with three consecutive pixel portions as one block.

FIG. 3 is a sectional view of the light receiving element portion 5. FIG. Corresponding to each pixel of the photosensor 6, C1Y and W filters 7 are provided above it. Above it, a glass plate 8 is arranged parallel to the photosensor 6. On the lower surface of the glass plate 8, a 1μ body having a neutral density corresponding to each filter color is placed at a position corresponding to each filter 7. 9 is given. The neutral density of each anti-body 9 is C1 when reading a white image.
It is determined from the ratio of the output of each pixel portion corresponding to Y or W. For example, in the case of the output ratio of W output>Y output>C output, the concentration ratio of the membrane 9 is set to an appropriate level such that W corresponding part immersion degree>Y corresponding part concentration>C corresponding part mystery degree. . The film body 9 can be easily formed by vapor deposition, and may be a single layer film or a multilayer film. For this,
The output signals from each pixel portion of the photosensor 6 are approximately averaged, making it possible to accurately output a read image of any color. In addition, when reproducing an image based on the 1iliI image information obtained by such reading, each color is reproduced by the density multiplied by the ratio of the neutral density applied to the part of the film body 9 corresponding to each color filter 7. All you have to do is color it.

As the membrane body 9 used in the present invention, for example, Z
attractants such as nS, TlO2*CeO2, kl,
Examples include metals such as Cr.

In FIG. 3, an infrared light reflecting film 1 is provided on the top surface of the glass plate 8.
0 is assigned. The reflective film 10 is, for example, a multilayer vapor deposited film. This can prevent infrared light from reaching the light-receiving element section 5, and can cover the drawbacks of the CCD photosensor, which is susceptible to the effects of infrared light.

[Effects of the present invention]

According to the reading device of the present invention as described above, force? - It is possible to output each color separation signal accurately at the image information reading button, and correct color tones can be reproduced during image reproduction.

[Brief explanation of drawings]

FIG. 261 is a schematic configuration diagram of the reading device of the present invention, FIG. 2 is a plan view of the constituent parts of the light receiving element section, and FIG. 3 is a sectional view of the light receiving element section. DESCRIPTION OF SYMBOLS 1... The stand is a lath, 2... Light source for illumination, 3... Reflection shade, 4... Imaging optical system, 5... Light receiving element part, 6...
・Photo sensor, 7... Color separation filter, 8...
- Glass plate, 9... dielectric film, 10... infrared light reflective film. ! +(71 Figure 2 1N3

Claims (2)

[Claims] (1) In a color reading device, the percentage sign is that three PI bodies having 1 degree of neutrality are arranged on the color separation filter attached to each pixel part of the light receiving part according to the color of the filter. , reader. (2) The reading device according to item 1, wherein an infrared light reflecting film is disposed on the dielectric material.