JPS57148766A - Laser beam printer - Google Patents

Laser beam printer

Info

Publication number
JPS57148766A
JPS57148766A JP56033905A JP3390581A JPS57148766A JP S57148766 A JPS57148766 A JP S57148766A JP 56033905 A JP56033905 A JP 56033905A JP 3390581 A JP3390581 A JP 3390581A JP S57148766 A JPS57148766 A JP S57148766A
Authority
JP
Japan
Prior art keywords
laser beam
output
detection
comparator
laser
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
JP56033905A
Other languages
Japanese (ja)
Inventor
Masahiro Yamamoto
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56033905A priority Critical patent/JPS57148766A/en
Publication of JPS57148766A publication Critical patent/JPS57148766A/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
    • 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
    • H04N1/40037—Circuits exciting or modulating particular heads for reproducing continuous tone value scales the reproducing element being a laser

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Laser Beam Printer (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Abstract

PURPOSE:To realize a highly effective operation of a laser beam printer, by providing a means that decides the output of a laser beam in the levels of two steps and using one of the two steps for detection of the position of the laser beam and using the other step for detection of the reduction of the laser beam volume respectively. CONSTITUTION:The laser beam L which is made incident in a certain cycle is detected by a beam detector 5, and the output of detection is supplied to comparators 8 and 9 respectively. The comparator 8 produces an output to an input signal higher than the comparison potential and sends the output to a BD driver 10 in the form of a detection signal for the position of the beam L. The comparator 9 produces an output to an input signal higher than the comparison potential which is higher than that of the comparator 8 and then sends it to a display 11 in the form of a reduction signal of the laser beam volume. In such a way, the exchange of laser oscillators, the control of an optical system, etc. are made possible before a laser beam printer becomes faulty of ensure a highly efficient operation of the laser printer.
JP56033905A 1981-03-11 1981-03-11 Laser beam printer Pending JPS57148766A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56033905A JPS57148766A (en) 1981-03-11 1981-03-11 Laser beam printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56033905A JPS57148766A (en) 1981-03-11 1981-03-11 Laser beam printer

Publications (1)

Publication Number Publication Date
JPS57148766A true JPS57148766A (en) 1982-09-14

Family

ID=12399527

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56033905A Pending JPS57148766A (en) 1981-03-11 1981-03-11 Laser beam printer

Country Status (1)

Country Link
JP (1) JPS57148766A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5959478A (en) * 1982-09-29 1984-04-05 Fujitsu Ltd Abnormal print detection system
JP2015049258A (en) * 2013-08-29 2015-03-16 京セラドキュメントソリューションズ株式会社 Optical scanner and image forming apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5959478A (en) * 1982-09-29 1984-04-05 Fujitsu Ltd Abnormal print detection system
JP2015049258A (en) * 2013-08-29 2015-03-16 京セラドキュメントソリューションズ株式会社 Optical scanner and image forming apparatus

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