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JPS5723289A - Light-quantity controller - Google Patents

Light-quantity controller

Info

Publication number
JPS5723289A
JPS5723289A JP9852080A JP9852080A JPS5723289A JP S5723289 A JPS5723289 A JP S5723289A JP 9852080 A JP9852080 A JP 9852080A JP 9852080 A JP9852080 A JP 9852080A JP S5723289 A JPS5723289 A JP S5723289A
Authority
JP
Japan
Prior art keywords
circuits
outputs
circuit
light
fed
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
JP9852080A
Other languages
Japanese (ja)
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 JP9852080A priority Critical patent/JPS5723289A/en
Priority to US06/225,345 priority patent/US4443695A/en
Priority to DE3153710A priority patent/DE3153710C2/en
Priority to DE19813102185 priority patent/DE3102185A1/en
Publication of JPS5723289A publication Critical patent/JPS5723289A/en
Pending 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)
  • General Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Laser Beam Printer (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Optical Head (AREA)
  • Semiconductor Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To obtain an inexpensive light-quantity controller, suitable for an apparatus wherein an light output for a short period of time can be neglected, by providing to a plurality of light-emitting elements a single photodetector and a plurality of driving circuits to drive the respective light-emitting elements, and finely changing the hold currents of said circuits. CONSTITUTION:The current values determined in current-amplifying circuits 31-1-31-n are applied to corresponding switching circuits 32-1-32-n and at the same time, the outputs corresponding to the input signals from signals lines iL1- iLn are delivered from the circuits 32-1-32-n and fed to a semiconductor laser array 9 including laser elements 9-1-9-n in order to output laser beams L1-Ln and LB1-LBn. Then, either of said outputs is detected by means of a detecting circuit 22 and fed to an upper-limit comparing circuit 25 and an upper-limit value setting circuit 23, and to a lower-limit comparing circuit 26 and a lower-limit value setting circuit 24, and in a counter-controlling signal forming circuit 28, the outputs for correcting the outputs of the circuits 31-1-31-n are obtained. Thereafter, said outputs are changed over in a changeover circuit 27, and said circuits 31-1-31-n are selected by using a reversable counter group 29-1-29-n and a D/A converter group 30-1-30-n.
JP9852080A 1980-01-25 1980-07-17 Light-quantity controller Pending JPS5723289A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP9852080A JPS5723289A (en) 1980-07-17 1980-07-17 Light-quantity controller
US06/225,345 US4443695A (en) 1980-01-25 1981-01-15 Apparatus for controlling the quantity of light
DE3153710A DE3153710C2 (en) 1980-01-25 1981-01-23 Light output monitor from semiconductor laser
DE19813102185 DE3102185A1 (en) 1980-01-25 1981-01-23 CONTROL DEVICE FOR RADIATION QUANTITY CONTROL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9852080A JPS5723289A (en) 1980-07-17 1980-07-17 Light-quantity controller

Publications (1)

Publication Number Publication Date
JPS5723289A true JPS5723289A (en) 1982-02-06

Family

ID=14221925

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9852080A Pending JPS5723289A (en) 1980-01-25 1980-07-17 Light-quantity controller

Country Status (1)

Country Link
JP (1) JPS5723289A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63163872A (en) * 1986-12-26 1988-07-07 Toshiba Corp Image forming device
JPS63198387A (en) * 1987-02-13 1988-08-17 Hitachi Ltd Semiconductor laser array device
JPH0269783A (en) * 1988-09-06 1990-03-08 Canon Inc Image recorder
JPH0297976A (en) * 1988-10-05 1990-04-10 Hitachi Ltd Scanning type picture recorder
US6587495B2 (en) 1997-08-28 2003-07-01 Canon Kabushiki Kaisha Semiconductor laser device, and image forming apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5447511A (en) * 1977-09-22 1979-04-14 Ricoh Co Ltd Optical scan recorder
JPS5559790A (en) * 1978-10-30 1980-05-06 Fujitsu Ltd Double laser device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5447511A (en) * 1977-09-22 1979-04-14 Ricoh Co Ltd Optical scan recorder
JPS5559790A (en) * 1978-10-30 1980-05-06 Fujitsu Ltd Double laser device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JPS63198387A (en) * 1987-02-13 1988-08-17 Hitachi Ltd Semiconductor laser array device
JPH0269783A (en) * 1988-09-06 1990-03-08 Canon Inc Image recorder
JPH0297976A (en) * 1988-10-05 1990-04-10 Hitachi Ltd Scanning type picture recorder
US6587495B2 (en) 1997-08-28 2003-07-01 Canon Kabushiki Kaisha Semiconductor laser device, and image forming apparatus
US6633598B1 (en) 1997-08-28 2003-10-14 Canon Kabushiki Kaisha Semiconductor laser device, and image forming apparatus

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