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JPS56105686A - Controller for quantity of light - Google Patents

Controller for quantity of light

Info

Publication number
JPS56105686A
JPS56105686A JP862180A JP862180A JPS56105686A JP S56105686 A JPS56105686 A JP S56105686A JP 862180 A JP862180 A JP 862180A JP 862180 A JP862180 A JP 862180A JP S56105686 A JPS56105686 A JP S56105686A
Authority
JP
Japan
Prior art keywords
circuit
elements
ldn
comparison
circuits
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
JP862180A
Other languages
Japanese (ja)
Other versions
JPS6342432B2 (en
Inventor
Takashi Kitamura
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP862180A priority Critical patent/JPS56105686A/en
Priority to US06/225,345 priority patent/US4443695A/en
Priority to DE19813102185 priority patent/DE3102185A1/en
Priority to DE3153710A priority patent/DE3153710C2/en
Publication of JPS56105686A publication Critical patent/JPS56105686A/en
Publication of JPS6342432B2 publication Critical patent/JPS6342432B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/40025—Circuits exciting or modulating particular heads for reproducing continuous tone value scales
    • H04N1/4005—Circuits exciting or modulating particular heads for reproducing continuous tone value scales with regulating circuits, e.g. dependent upon ambient temperature or feedback control
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/12—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers
    • G06K15/1204—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers involving the fast moving of an optical beam in the main scanning direction
    • G06K15/1209—Intensity control of the optical beam
    • G06K15/1214—Intensity control of the optical beam by feedback
    • 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
    • H01S5/06825—Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation
    • 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
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Semiconductor Lasers (AREA)
  • Led Devices (AREA)
  • Laser Beam Printer (AREA)

Abstract

PURPOSE:To increase the life of luminous elements and improve the speed of response by a method wherein a light detecting circuit and a comparison circuit of a controller are shared, and circuit constitution is simplified while currents not less than necessary currents are not supplied to the luminous elements. CONSTITUTION:A plurality of semiconductor elements LD1-LDn of a semiconductor laser array 1 are selectively driven by means of switch circuits 21-1-21-n, and back beams BL1-BLn that the elements LD1-LDn radiate are detected by means of a light detecting circuit 11. Signals detected by means of the circuit 11 are compared with reference signals from a reference level setting circuit 13 by means of a comparison circuit 14 of a luminous energy controller, and the results of comparison are added to a change-over circuit 15. Control circuits 16-1-16-n controlling the circuits 21-1-21-n are selected by timing signals from a terminal TM by means of the circuit 15. Counters counting signals from an oscillation circuit 17 and D/A converters are mounted to the circuits 16-1-16-n, and the currents of the elements LD1-LDn can be controlled in response to the results of comparison of the circuit 15, thus lengthening the life of the elements LD1-LDn.
JP862180A 1980-01-25 1980-01-28 Controller for quantity of light Granted JPS56105686A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP862180A JPS56105686A (en) 1980-01-28 1980-01-28 Controller for quantity of light
US06/225,345 US4443695A (en) 1980-01-25 1981-01-15 Apparatus for controlling the quantity of light
DE19813102185 DE3102185A1 (en) 1980-01-25 1981-01-23 CONTROL DEVICE FOR RADIATION QUANTITY CONTROL
DE3153710A DE3153710C2 (en) 1980-01-25 1981-01-23 Light output monitor from semiconductor laser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP862180A JPS56105686A (en) 1980-01-28 1980-01-28 Controller for quantity of light

Publications (2)

Publication Number Publication Date
JPS56105686A true JPS56105686A (en) 1981-08-22
JPS6342432B2 JPS6342432B2 (en) 1988-08-23

Family

ID=11698006

Family Applications (1)

Application Number Title Priority Date Filing Date
JP862180A Granted JPS56105686A (en) 1980-01-25 1980-01-28 Controller for quantity of light

Country Status (1)

Country Link
JP (1) JPS56105686A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56140477A (en) * 1980-04-02 1981-11-02 Ricoh Co Ltd Laser driving control system
JPS63163872A (en) * 1986-12-26 1988-07-07 Toshiba Corp Image forming device
JPS63134498U (en) * 1987-02-25 1988-09-02
JPH02192693A (en) * 1988-12-06 1990-07-30 Anritsu Corp Stabilized light source device
US6204870B1 (en) 1998-09-08 2001-03-20 Canon Kabushiki Kaisha Image formation apparatus control by measurement of image patterns having different emission rising characteristics

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6678295B2 (en) * 2000-05-11 2004-01-13 Brother Kogyo Kabushiki Kaisha Laser drive control apparatus and methods

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54129904A (en) * 1978-03-31 1979-10-08 Fujitsu Ltd Doubling system of light source

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54129904A (en) * 1978-03-31 1979-10-08 Fujitsu Ltd Doubling system of light source

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56140477A (en) * 1980-04-02 1981-11-02 Ricoh Co Ltd Laser driving control system
JPS63163872A (en) * 1986-12-26 1988-07-07 Toshiba Corp Image forming device
JPH0712709B2 (en) * 1986-12-26 1995-02-15 株式会社東芝 Image forming device
JPS63134498U (en) * 1987-02-25 1988-09-02
JPH02192693A (en) * 1988-12-06 1990-07-30 Anritsu Corp Stabilized light source device
US6204870B1 (en) 1998-09-08 2001-03-20 Canon Kabushiki Kaisha Image formation apparatus control by measurement of image patterns having different emission rising characteristics
US6384856B2 (en) 1998-09-08 2002-05-07 Canon Kabushiki Kaisha Image formation apparatus correction system

Also Published As

Publication number Publication date
JPS6342432B2 (en) 1988-08-23

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