JPS642014A - Synchronizing signal detector - Google Patents

Synchronizing signal detector

Info

Publication number
JPS642014A
JPS642014A JP62157426A JP15742687A JPS642014A JP S642014 A JPS642014 A JP S642014A JP 62157426 A JP62157426 A JP 62157426A JP 15742687 A JP15742687 A JP 15742687A JP S642014 A JPS642014 A JP S642014A
Authority
JP
Japan
Prior art keywords
synchronizing signal
laser beam
zero cross
cross point
outputs
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
JP62157426A
Other languages
Japanese (ja)
Other versions
JPH012014A (en
Inventor
Yoshio Hayashi
Shigenori Takano
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.)
Nidec Instruments Corp
Original Assignee
Sankyo Seiki Manufacturing 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 Sankyo Seiki Manufacturing Co Ltd filed Critical Sankyo Seiki Manufacturing Co Ltd
Priority to JP62-157426A priority Critical patent/JPH012014A/en
Priority claimed from JP62-157426A external-priority patent/JPH012014A/en
Publication of JPS642014A publication Critical patent/JPS642014A/en
Publication of JPH012014A publication Critical patent/JPH012014A/en
Pending legal-status Critical Current

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Landscapes

  • Facsimile Transmission Control (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Laser Beam Printer (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

PURPOSE: To stably detect a synchronizing signal without degrading S/N by computing the difference in the outputs of two photodetecting elements and extracting the synchronizing signal from the zero cross point of the computed outputs.
CONSTITUTION: The laser beam which is emitted from a laser 11 and is scanned by being deflected by a rotary polyhedral mirror 12 is detected by the photodetecting element 14 via a mirror 13. The photodetecting element 14 is constituted of the photodetecting elements 14a, 14b having a partition line in the direction perpendicular to the scanning direction of the laser beam. The detected signals thereof are subjected to the computation of the difference thereof in a subtraction circuit 16 via amplifiers 15a, 15b and the synchronizing signal is extracted from the zero cross point of the computed outputs. The position of the zero cross point does not change even if the intensity of the incident laser beam changes and, therefore, the stable synchronizing signal is obtd.
COPYRIGHT: (C)1989,JPO&Japio
JP62-157426A 1987-06-24 Synchronous signal detection device Pending JPH012014A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62-157426A JPH012014A (en) 1987-06-24 Synchronous signal detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62-157426A JPH012014A (en) 1987-06-24 Synchronous signal detection device

Publications (2)

Publication Number Publication Date
JPS642014A true JPS642014A (en) 1989-01-06
JPH012014A JPH012014A (en) 1989-01-06

Family

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006337716A (en) * 2005-06-02 2006-12-14 Suzuka Fuji Xerox Co Ltd Starting point detection sensor substrate and optical scanner

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5461545A (en) * 1977-10-26 1979-05-17 Hitachi Ltd Optically scanning location
JPS63216017A (en) * 1987-03-05 1988-09-08 Ricoh Co Ltd Synchronous signal generator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5461545A (en) * 1977-10-26 1979-05-17 Hitachi Ltd Optically scanning location
JPS63216017A (en) * 1987-03-05 1988-09-08 Ricoh Co Ltd Synchronous signal generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006337716A (en) * 2005-06-02 2006-12-14 Suzuka Fuji Xerox Co Ltd Starting point detection sensor substrate and optical scanner

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