JPS5996641U

JPS5996641U - Image reading device

Info

Publication number: JPS5996641U
Application number: JP19222482U
Authority: JP
Inventors: 和男広瀬
Original assignee: 富士ゼロックス株式会社
Priority date: 1982-12-21
Filing date: 1982-12-21
Publication date: 1984-06-30

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来の画像読取装置の一例を示すブロック図、
第２図は本考案の画像読取装置の一実施例を示すブロッ
ク図、第３図は本考案の他の実施例を示すブロック図、
第４図は第２図の動作を説明するための信号波形図、第
５図は第３図の動作を説明するための信号波形図であ−
る。１・・・レンズ、２・・・イメージセンサ、３・・・可
変利得増幅器、５・・・比較器、６・・・基準電圧源、
７・・・スイッチ、８・・・Ａ／Ｄ変換器、９．９ａ・
・・演算回路、１０・・・メモリ、１１・・・Ｄ／Ａ変
換器、１２・・・固定利得増幅器。FIG. 1 is a block diagram showing an example of a conventional image reading device.
FIG. 2 is a block diagram showing one embodiment of the image reading device of the present invention, FIG. 3 is a block diagram showing another embodiment of the present invention,
4 is a signal waveform diagram for explaining the operation of FIG. 2, and FIG. 5 is a signal waveform diagram for explaining the operation of FIG. 3.
Ru. DESCRIPTION OF SYMBOLS 1... Lens, 2... Image sensor, 3... Variable gain amplifier, 5... Comparator, 6... Reference voltage source,
7... Switch, 8... A/D converter, 9.9a.
...Arithmetic circuit, 10...Memory, 11...D/A converter, 12...Fixed gain amplifier.

Claims

[Scope of utility model registration request]

A lens that forms an image of light onto an image sensor, an image sensor that converts the imaged light into an electrical signal in each element provided corresponding to each pixel, and sequentially outputs it in a scheduled order, and the image sensor. a variable gain amplifier that amplifies the output of the variable gain amplifier by changing its gain according to an external signal, and an image reading device that compares the output of the variable gain amplifier with a reference level and extracts it as a binary image signal, A/D converts the reference density image electrical signal of the image sensor corresponding to the reference uniform density image into A/D and sequentially outputs it.
a converter, an arithmetic circuit that converts a digital signal output from the A/D converter into a predetermined correction coefficient, and a computation result of the arithmetic circuit that is stored in a predetermined location corresponding to each element of the image sensor. , and when the image to be read is converted into an electrical signal by the image sensor, a memory is provided in which the calculation results are sequentially read out according to the change, and the output of the memory is converted into a D/A converter. an image reading device comprising: a D/A converter for supplying the signal to the variable gain amplifier and controlling the gain thereof;