JPS601043U

JPS601043U - photoelectric switch

Info

Publication number: JPS601043U
Application number: JP9183483U
Authority: JP
Inventors: 島　正雄
Original assignee: 株式会社山武
Priority date: 1983-06-15
Filing date: 1983-06-15
Publication date: 1985-01-07

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) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図はこの考案における光電スイッチの一実施例を示
すブロック図、第２図は第１図の各部における波形図で
ある。１・・・・・・２色発光ダイオード、２・・・・・・切
換えスイッチ、３・・・・・・抵抗、４・・・・・・同
期回路、５・・・・・・発振器、６・・・・・・測定物
体、７・・・・・・光ケーブル、８・・・・・・光ケー
ブル、１１・・・・・・受光素子、１２・・・・・・プ
リアンプ、１３・・・・・・サイプルホールド回路、１
４・・・・・・演算器、１５・・・・・・しきい値設定
器、１６・・・・・・ウィンドコンパレータ、１７・・
・・・・ドライバー。FIG. 1 is a block diagram showing an embodiment of the photoelectric switch of this invention, and FIG. 2 is a waveform diagram of each part of FIG. 1. 1... Two-color light emitting diode, 2... Changeover switch, 3... Resistor, 4... Synchronous circuit, 5... Oscillator, 6... Measurement object, 7... Optical cable, 8... Optical cable, 11... Light receiving element, 12... Preamplifier, 13... ...Siple hold circuit, 1
4... Arithmetic unit, 15... Threshold setter, 16... Window comparator, 17...
····driver.

Claims

[Scope of utility model registration request]

A two-color light emitting diode that irradiates the measurement object with light of different wavelengths, a synchronization circuit that lights up the light emitting diode in a time-sharing manner, and receives reflected light from the measurement object in synchronization with the lighting timing of each light emitting diode. a sample-and-hold circuit that samples the output of this light-receiving element, an arithmetic unit that calculates the ratio of the output of this sample-and-hold circuit, and a threshold setter that sets a threshold value for the output of this arithmetic unit. A photoelectric switch comprising: a photoelectric switch for identifying color differences by utilizing the fact that the output ratio of the light receiving element differs depending on the color of the object to be measured.