JPS56107264A - Controller for quantity of light - Google Patents

Controller for quantity of light

Info

Publication number
JPS56107264A
JPS56107264A JP974180A JP974180A JPS56107264A JP S56107264 A JPS56107264 A JP S56107264A JP 974180 A JP974180 A JP 974180A JP 974180 A JP974180 A JP 974180A JP S56107264 A JPS56107264 A JP S56107264A
Authority
JP
Japan
Prior art keywords
counter
signal
limit
emitted light
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
JP974180A
Other languages
Japanese (ja)
Other versions
JPH0363073B2 (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 JP974180A priority Critical patent/JPS56107264A/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 JPS56107264A publication Critical patent/JPS56107264A/en
Publication of JPH0363073B2 publication Critical patent/JPH0363073B2/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)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Signal Processing (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Laser Beam Printer (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Semiconductor Lasers (AREA)

Abstract

PURPOSE:To enable control over the quantity of light without using a high-speed photodetector by exercising output control over a semiconductor laser on arrival of a recording signal of greater than a constant width. CONSTITUTION:The current that corresponds to the count value of reverisble counter 17 drives semiconductor laser 1 and when its quantity of emitted light is greater or less than the upper limit or lower limit of a set range, the signal of upper- limit or lower-limit comparing circuit 14 or 16 is applied to counter 17. On arrival of a recording signal of a high level longer than time (t), the count value of counter 17 decreases or increases by the signal of pulse-width detecting circuit 19 and the output of current limiting circuit 21 also varies accordingly, so that the quantity of emitted light of laser 1 will decrease or increase. If the quantity of emitted light does not reach a prescribed value according to fluctuations of the ambient temperature, a carry or borrow signal is sent from counter 17 to safety circuit 22, so that while counter 17 is reset, an external alarm will be given.
JP974180A 1980-01-25 1980-01-30 Controller for quantity of light Granted JPS56107264A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP974180A JPS56107264A (en) 1980-01-30 1980-01-30 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
JP974180A JPS56107264A (en) 1980-01-30 1980-01-30 Controller for quantity of light

Publications (2)

Publication Number Publication Date
JPS56107264A true JPS56107264A (en) 1981-08-26
JPH0363073B2 JPH0363073B2 (en) 1991-09-27

Family

ID=11728729

Family Applications (1)

Application Number Title Priority Date Filing Date
JP974180A Granted JPS56107264A (en) 1980-01-25 1980-01-30 Controller for quantity of light

Country Status (1)

Country Link
JP (1) JPS56107264A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57162481A (en) * 1981-03-23 1982-10-06 Ibm Control circuit for light emtting semiconductor device
JPS58162659U (en) * 1982-04-23 1983-10-29 日立工機株式会社 Laser diode light amount detection device
JPS61165774A (en) * 1984-12-27 1986-07-26 Fujitsu Ltd Output level control system of semiconductor laser
JPS61259585A (en) * 1985-05-13 1986-11-17 Hitachi Cable Ltd Semiconductor laser protecting device
JPH09266353A (en) * 1996-03-28 1997-10-07 Nec Corp Digital light power control circuit
US5966159A (en) * 1994-05-24 1999-10-12 Canon Kabushiki Kaisha Method and apparatus for adjusting an apparatus using light source and recording apparatus adjusted thereby
JP2009001006A (en) * 2007-05-24 2009-01-08 Ricoh Co Ltd Image forming apparatus and image forming method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS543540A (en) * 1977-06-10 1979-01-11 Canon Inc Automatic exposure device
JPS5413343A (en) * 1977-07-01 1979-01-31 Canon Inc Recording apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS543540A (en) * 1977-06-10 1979-01-11 Canon Inc Automatic exposure device
JPS5413343A (en) * 1977-07-01 1979-01-31 Canon Inc Recording apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57162481A (en) * 1981-03-23 1982-10-06 Ibm Control circuit for light emtting semiconductor device
JPS6355791B2 (en) * 1981-03-23 1988-11-04 Intaanashonaru Bijinesu Mashiinzu Corp
JPS58162659U (en) * 1982-04-23 1983-10-29 日立工機株式会社 Laser diode light amount detection device
JPS61165774A (en) * 1984-12-27 1986-07-26 Fujitsu Ltd Output level control system of semiconductor laser
JPH041343B2 (en) * 1984-12-27 1992-01-10 Fujitsu Ltd
JPS61259585A (en) * 1985-05-13 1986-11-17 Hitachi Cable Ltd Semiconductor laser protecting device
JPH0452634B2 (en) * 1985-05-13 1992-08-24 Hitachi Cable
US5966159A (en) * 1994-05-24 1999-10-12 Canon Kabushiki Kaisha Method and apparatus for adjusting an apparatus using light source and recording apparatus adjusted thereby
JPH09266353A (en) * 1996-03-28 1997-10-07 Nec Corp Digital light power control circuit
JP2009001006A (en) * 2007-05-24 2009-01-08 Ricoh Co Ltd Image forming apparatus and image forming method

Also Published As

Publication number Publication date
JPH0363073B2 (en) 1991-09-27

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