JPS5773566A - Information write-in method - Google Patents

Information write-in method

Info

Publication number
JPS5773566A
JPS5773566A JP55149010A JP14901080A JPS5773566A JP S5773566 A JPS5773566 A JP S5773566A JP 55149010 A JP55149010 A JP 55149010A JP 14901080 A JP14901080 A JP 14901080A JP S5773566 A JPS5773566 A JP S5773566A
Authority
JP
Japan
Prior art keywords
output
photodetectors
amplifiers
comparator
high level
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
JP55149010A
Other languages
Japanese (ja)
Inventor
Isamu Shibata
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP55149010A priority Critical patent/JPS5773566A/en
Publication of JPS5773566A publication Critical patent/JPS5773566A/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
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Laser Beam Printer (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Dot-Matrix Printers And Others (AREA)

Abstract

PURPOSE:To perform timing detection with good accuracy and to increase the accuracy of arrangement toward subscanning direction for information, by arranging two photodetectors near the subscanning direction, detecting optical beam after deflection and detecting the timing for information write-in, for good timing detection. CONSTITUTION:Two photodetectors PD1, PD2 are arranged near the subscanning direction of light beam. The output of the photodetectors PD1, PD2 is amplified respectively at amplifiers 15, 16. The output of the amplifiers 15, 16 is compared at a comparator 17 and when the relation of amplitude is inverted, the output of the comparator 17 rises from low to high level. The output of the amplifiers 15, 16 is inputted to an OR circuit 18 and the outputs are at high level when the laser beam is near the photodetectors PD1, PD2. The output of the comparator 17 is outputted through a gate circuit 19 with a high level signal of the OR circuit 18, and the input start timing of character information for one scanning's share can be determined.
JP55149010A 1980-10-24 1980-10-24 Information write-in method Pending JPS5773566A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55149010A JPS5773566A (en) 1980-10-24 1980-10-24 Information write-in method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55149010A JPS5773566A (en) 1980-10-24 1980-10-24 Information write-in method

Publications (1)

Publication Number Publication Date
JPS5773566A true JPS5773566A (en) 1982-05-08

Family

ID=15465694

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55149010A Pending JPS5773566A (en) 1980-10-24 1980-10-24 Information write-in method

Country Status (1)

Country Link
JP (1) JPS5773566A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59229970A (en) * 1983-06-10 1984-12-24 Nippon Kogaku Kk <Nikon> Light beam scanner
JPH05167792A (en) * 1991-12-11 1993-07-02 Fuji Photo Film Co Ltd Optical scanning position detector
US7518626B2 (en) 2003-10-16 2009-04-14 Sharp Kabushiki Kaisha Light beam synchronization detector and printer
US7823401B2 (en) 2006-10-27 2010-11-02 Denso Corporation Refrigerant cycle device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59229970A (en) * 1983-06-10 1984-12-24 Nippon Kogaku Kk <Nikon> Light beam scanner
JPH05167792A (en) * 1991-12-11 1993-07-02 Fuji Photo Film Co Ltd Optical scanning position detector
US7518626B2 (en) 2003-10-16 2009-04-14 Sharp Kabushiki Kaisha Light beam synchronization detector and printer
US7823401B2 (en) 2006-10-27 2010-11-02 Denso Corporation Refrigerant cycle device

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