JPS6123457A - Photoelectric converter - Google Patents

Abstract

PURPOSE:To attain reading without using a color filter by arranging photoelectric converting elements having the spectral sensitivity different in color component in a main scanning direction in a prescribed order in a line in a color picture information input device. CONSTITUTION:A CdS-CdSe group photoconductive film is used as a photoelectric converting element of a photo sensor array and the photoelectric converting elements A-C where the peak of the spectral sensitivity is changed by changing the fixed ratio of CdS to CdSe in the photoconductive film are arranged in a line in a proper predetermined order. Since the color separation is performed by the photoelectric converting elements A-C themselves and color picture information is read, the color picture information is read without using a color filter array.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image information input device necessary for various office automation equipment such as a facsimile machine and a copying machine, and particularly to a photoelectric conversion device used in a color image information input device.

Conventional Structure and Problems One of the conventional methods of reading a document by an image information input device that corresponds one-to-one with a document is as shown in FIG. 1 is a document, 2 is a solid-state light source array, 3 is a condensing optical fiber array, and 4 is a photosensor array. Normal reading is black and white 2A-.

Although the image information is binary, in order to read the color image information of the document, an optical sensor array 4 is used as shown in Figure 2.
It is necessary to directly form a three-color color filter array 9 on top of the photoelectric conversion element 8. 6 is an insulating substrate, 6 is a common electrode, and 7 is an individual electrode.

However, since the contact type image sensor is approximately the same size as the original, there is a difficulty in that a long color filter array must be formed with high accuracy and high density, or it must be pasted together.

OBJECTS OF THE INVENTION In order to solve the above-mentioned difficulties, it is an object of the present invention to provide an image information input device capable of reading color image information of a document without using a color filter. The purpose is to

Structure of the Invention The present invention provides an insulating plate with red, green, and
By arranging photoelectric conversion elements having steep spectral sensitivity peaks for each of the blue color components in a row in an arbitrary order, color separation is performed by the photoelectric conversion elements themselves.
The present invention provides a color image information input device that can read color image information of a document.

DESCRIPTION OF THE EMBODIMENTS In order to read the color information of a document or the like, it is necessary to separate signals into the three primary colors of red, green, and blue for each pixel and capture the signals. As mentioned above, one well-known method for this purpose is to use a color filter array as shown in FIG. PR to Shi
Three types of photoelectric conversion elements formed on the substrate 7 are used. The three types (shown here with the symbols ■, ■, ■)
The spectral sensitivities of the photoelectric conversion elements are different from each other as shown in FIG.

It has steep peaks around 550 nm and 480 nm. By doing so, the reflected light from the original will also be
The photoelectric conversion element (■) only converts red light around 650 nm.
Similarly, ■ selectively detects only green light around 550 nm, and ■ selectively detects only blue light around 480 nm, separating the reflected light from the original into signals of the three primary colors of red, green, and blue. be able to.

In fact, in order to realize the above color image information input device, Cd3-
By using CdSe-based photoconductive films and changing the bath ratio of CdS and CdSe, it is possible to utilize the fact that the peak of spectral sensitivity can be freely changed from around 500 nm to around 730 nm.

That is, as the charge conversion element (■), a photoconductive film of Cd5 (spectral sensitivity peak around 500 nm) or Zn5e (spectral sensitivity peak around 480 nm) is used, and as the photoelectric conversion element (■), Cd5o, 7Seo, 3 ( Using a photoconductive film with a spectral sensitivity peak of around 550 nm), as the photoelectric conversion element (2), Cd S o , S S e o
, -r (spectral sensitivity peak around 650 nm) The configuration of the present invention can be realized by using a photoconductive film.

5 bae.

Effects of the Invention By realizing the present invention, it is possible to create a color image information input device without using a color filter array, which is difficult to form and attach a long color filter array on a photoelectric conversion element with high precision and high density. Can be provided.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a contact shadow image information input device, FIG. 2 is a sketch of the main parts of a contact image sensor, FIG. 3 is a sketch of the main parts of a contact image sensor according to an embodiment of the present invention, and FIG. 4 is a graph of the spectral sensitivity of three types of photoelectric conversion elements used in the present invention (each graph is normalized by the peak). 1... Manuscript, 2... Solid-state light source array,
3... Light-concentrating optical fiber array, 4...
・・Photo sensor array, 6・・・・Insulating substrate, 6・
... Common electrode, 7 ... Individual electrode, ■, ■
,■...Photoelectric conversion element. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A plurality of types of photoelectric conversion elements having spectral sensitivity only to each of different color components in the main scanning direction on an insulating substrate and arranged in a line in an order according to a predetermined rule, and for extracting signals from the photoelectric conversion elements. A photoelectric conversion device comprising: an electrode.