JPS5736366A - Optical signal output circuit - Google Patents

Optical signal output circuit

Info

Publication number
JPS5736366A
JPS5736366A JP11141780A JP11141780A JPS5736366A JP S5736366 A JPS5736366 A JP S5736366A JP 11141780 A JP11141780 A JP 11141780A JP 11141780 A JP11141780 A JP 11141780A JP S5736366 A JPS5736366 A JP S5736366A
Authority
JP
Japan
Prior art keywords
output
diode
light receiving
resistance
light emitting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP11141780A
Other languages
Japanese (ja)
Other versions
JPH0145107B2 (en
Inventor
Yoshihei Tani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP11141780A priority Critical patent/JPS5736366A/en
Publication of JPS5736366A publication Critical patent/JPS5736366A/en
Publication of JPH0145107B2 publication Critical patent/JPH0145107B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10851—Circuits for pulse shaping, amplifying, eliminating noise signals, checking the function of the sensing device

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Optical Head (AREA)
  • Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)

Abstract

PURPOSE:To suppress the output change of a light receiving element due to various optical causes and stabilize the output signal to obtain releable output by installing a feedback circuit controlling the operation current of a light emitting element through the photoelectric output of the light receiving element between light receiving and light emitting elements. CONSTITUTION:A transistor TR to control operation current is connected to the anode side of a light emitting diode D and the cathode side of the diode D is earthed. A phototransistor PT, light receiving element, is connected to a power source VCC through resistance R4, the potential V4 of a connection part Q between the resistance R1 and PT is taken out as optical output and the optical output is inputted to a comparator COMP whose another input is standard voltage VSO. An operation amplifier OP is installed between the base of TR connected to the diode D in series and the optical output of PT, and a feedback circuit with a time constant circuit composed of a capacitor C and a resistance R6 is connected between the inversion terminal and output terminal of the amplifier OP, controlling the operation current of the diode D and stabilizing the output of PT.
JP11141780A 1980-08-12 1980-08-12 Optical signal output circuit Granted JPS5736366A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11141780A JPS5736366A (en) 1980-08-12 1980-08-12 Optical signal output circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11141780A JPS5736366A (en) 1980-08-12 1980-08-12 Optical signal output circuit

Publications (2)

Publication Number Publication Date
JPS5736366A true JPS5736366A (en) 1982-02-27
JPH0145107B2 JPH0145107B2 (en) 1989-10-02

Family

ID=14560639

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11141780A Granted JPS5736366A (en) 1980-08-12 1980-08-12 Optical signal output circuit

Country Status (1)

Country Link
JP (1) JPS5736366A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6020664U (en) * 1983-07-19 1985-02-13 関西日本電気株式会社 barcode reader
JPS6374723U (en) * 1986-11-04 1988-05-18
US5043565A (en) * 1985-12-11 1991-08-27 Deutsche Thomson-Brandt Gmbh Process and circuit for compensating changes

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5178929A (en) * 1974-12-30 1976-07-09 Fujitsu Ltd

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5178929A (en) * 1974-12-30 1976-07-09 Fujitsu Ltd

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6020664U (en) * 1983-07-19 1985-02-13 関西日本電気株式会社 barcode reader
US5043565A (en) * 1985-12-11 1991-08-27 Deutsche Thomson-Brandt Gmbh Process and circuit for compensating changes
JPS6374723U (en) * 1986-11-04 1988-05-18

Also Published As

Publication number Publication date
JPH0145107B2 (en) 1989-10-02

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