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JPS56133714A - Light level controlling system of optical scanner - Google Patents

Light level controlling system of optical scanner

Info

Publication number
JPS56133714A
JPS56133714A JP3806480A JP3806480A JPS56133714A JP S56133714 A JPS56133714 A JP S56133714A JP 3806480 A JP3806480 A JP 3806480A JP 3806480 A JP3806480 A JP 3806480A JP S56133714 A JPS56133714 A JP S56133714A
Authority
JP
Japan
Prior art keywords
laser
circuit
output
controlling
counter
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.)
Pending
Application number
JP3806480A
Other languages
Japanese (ja)
Inventor
Minoru Koseki
Tadashi Matsuda
Fumitaka Abe
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 JP3806480A priority Critical patent/JPS56133714A/en
Publication of JPS56133714A publication Critical patent/JPS56133714A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/06821—Stabilising other output parameters than intensity or frequency, e.g. phase, polarisation or far-fields

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

PURPOSE:To enable light level controlling to be performed inexpensively by comparing the output of a photodetecting means and a reference level, and controlling the output of a counter circuit thereby fluctuating the laser driving signal from a laser controlling circuit. CONSTITUTION:A video controlling circuit 4 generates the video signal 4' corresponding to images, and a laser controlling circuit 5 emits a laser driving signal from this signal, thereby driving a semiconductor laser 1. The laser beam 1'' outputted on the side opposite from the recording laser beam 1' from the semiconductor laser 1 is received in a photodetecting circuit 2 and is compared with reference voltage 3' in a comparator circuit 3. A counter circuit 7 counts the monitor clock signals 4'' generated during nonscanning period from the video controlling circuit 4, by which the correction of the counter 7 is accomplished. The output of the counter 7 is converted to an analog signal by a D/A converting circuit 6, by the output thereof the output of the laser driving signal from the laser controlling circuit 5 is fluctuated, and the laser beam is adjusted.
JP3806480A 1980-03-25 1980-03-25 Light level controlling system of optical scanner Pending JPS56133714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3806480A JPS56133714A (en) 1980-03-25 1980-03-25 Light level controlling system of optical scanner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3806480A JPS56133714A (en) 1980-03-25 1980-03-25 Light level controlling system of optical scanner

Publications (1)

Publication Number Publication Date
JPS56133714A true JPS56133714A (en) 1981-10-20

Family

ID=12515057

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3806480A Pending JPS56133714A (en) 1980-03-25 1980-03-25 Light level controlling system of optical scanner

Country Status (1)

Country Link
JP (1) JPS56133714A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0258060A2 (en) * 1986-08-27 1988-03-02 Canon Kabushiki Kaisha Light quantity control device
US6744034B2 (en) * 2002-01-30 2004-06-01 Texas Instruments Incorporated Micro-electromechanical apparatus and method with position sensor compensation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0258060A2 (en) * 1986-08-27 1988-03-02 Canon Kabushiki Kaisha Light quantity control device
US4890288A (en) * 1986-08-27 1989-12-26 Canon Kabushiki Kaisha Light quantity control device
US6744034B2 (en) * 2002-01-30 2004-06-01 Texas Instruments Incorporated Micro-electromechanical apparatus and method with position sensor compensation

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