JPS55150019A - Automatic control circuit for optical output - Google Patents

Automatic control circuit for optical output

Info

Publication number
JPS55150019A
JPS55150019A JP5677379A JP5677379A JPS55150019A JP S55150019 A JPS55150019 A JP S55150019A JP 5677379 A JP5677379 A JP 5677379A JP 5677379 A JP5677379 A JP 5677379A JP S55150019 A JPS55150019 A JP S55150019A
Authority
JP
Japan
Prior art keywords
reference voltage
signal
voltage
control
circuit
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
JP5677379A
Other languages
Japanese (ja)
Other versions
JPH0159750B2 (en
Inventor
Yasuhiro Tanaka
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP5677379A priority Critical patent/JPS55150019A/en
Publication of JPS55150019A publication Critical patent/JPS55150019A/en
Publication of JPH0159750B2 publication Critical patent/JPH0159750B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control Of Non-Electrical Variables (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Feedback Control In General (AREA)
  • Optical Head (AREA)
  • Semiconductor Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE: To ensure the control for the optical output via a simple circuit by producing the reference voltage of the circuit giving the automatic control to the output of the light emitting element such as the laser diode or the like with the capacitor and the diode clamping circuit, thus facilitating an easy control for the base component of the reference voltage.
CONSTITUTION: Input signal Sg is supplied to light emitting element LD via the current switch consisting of transistors TR1 and TR2 in order to secure the ON/OFF control according to signal Sg. And the mean value of element LD is detected by light emission output detector PC. The detected mean value is applied to one input terminal of differential amplifier DA which forms diode clamping circuit DC; and signal Sg is supplied to the other input terminal of amplifier DA via capacitor C1. Then the reference voltage added with signal Sg is applied to the DC voltage of circuit DC. And the comparison is given between the reference voltage and the detected mean value through amplifier DA. Then the light emission is given to the voltage at the output terminal in order to secure the equal value to the voltage of the input side, and the control is given to the base of transistor TR3 to secure the constant amplitude of the optical output.
COPYRIGHT: (C)1980,JPO&Japio
JP5677379A 1979-05-09 1979-05-09 Automatic control circuit for optical output Granted JPS55150019A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5677379A JPS55150019A (en) 1979-05-09 1979-05-09 Automatic control circuit for optical output

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5677379A JPS55150019A (en) 1979-05-09 1979-05-09 Automatic control circuit for optical output

Publications (2)

Publication Number Publication Date
JPS55150019A true JPS55150019A (en) 1980-11-21
JPH0159750B2 JPH0159750B2 (en) 1989-12-19

Family

ID=13036777

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5677379A Granted JPS55150019A (en) 1979-05-09 1979-05-09 Automatic control circuit for optical output

Country Status (1)

Country Link
JP (1) JPS55150019A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5894829A (en) * 1981-12-02 1983-06-06 オリンパス光学工業株式会社 Light source apparatus of endoscope

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5894829A (en) * 1981-12-02 1983-06-06 オリンパス光学工業株式会社 Light source apparatus of endoscope
JPH0373845B2 (en) * 1981-12-02 1991-11-25

Also Published As

Publication number Publication date
JPH0159750B2 (en) 1989-12-19

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