JPS644775A - Laser beam writing device - Google Patents

Laser beam writing device

Info

Publication number
JPS644775A
JPS644775A JP15982887A JP15982887A JPS644775A JP S644775 A JPS644775 A JP S644775A JP 15982887 A JP15982887 A JP 15982887A JP 15982887 A JP15982887 A JP 15982887A JP S644775 A JPS644775 A JP S644775A
Authority
JP
Japan
Prior art keywords
output
luminous intensity
laser beam
circuit
detection signal
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
JP15982887A
Other languages
Japanese (ja)
Inventor
Kenichiro Asada
Takashi Mama
Naonobu Fujioka
Yoshio Kaneko
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 JP15982887A priority Critical patent/JPS644775A/en
Publication of JPS644775A publication Critical patent/JPS644775A/en
Pending legal-status Critical Current

Links

Landscapes

  • Laser Beam Printer (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE:To prevent the output of an abnormal image by detecting the position of radiating a laser beam on a photosensitive body by a luminous intensity detection means and outputting an abnormality detection signal according to the output. CONSTITUTION:The luminous intensity detector 22a outputs a current or a voltage in accordance with the intensity of the incident light of the laser beam 7a. The maximum value from a luminous intensity detection circuit 400 which inputs the output from the luminous intensity detector 22a is detected in a peak hold circuit 401 and the peak value is inputted in a comparator 402. It is compared with a reference voltage Vref set in a reference value setting circuit 403 in the comparator 402 and an abnormality detection signal generation circuit 404 generates the abnormality detection signal, by receiving the output from the comparison circuit 402. By detecting the deviation in the position of printing dots and generating the abnormality signal, the output of the abnormal image can be prevented from occurring in advance.
JP15982887A 1987-06-29 1987-06-29 Laser beam writing device Pending JPS644775A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15982887A JPS644775A (en) 1987-06-29 1987-06-29 Laser beam writing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15982887A JPS644775A (en) 1987-06-29 1987-06-29 Laser beam writing device

Publications (1)

Publication Number Publication Date
JPS644775A true JPS644775A (en) 1989-01-09

Family

ID=15702138

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15982887A Pending JPS644775A (en) 1987-06-29 1987-06-29 Laser beam writing device

Country Status (1)

Country Link
JP (1) JPS644775A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002042080A1 (en) * 2000-11-21 2002-05-30 Aetas Technology, Incorporated Imaging-offset compensation methods and systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002042080A1 (en) * 2000-11-21 2002-05-30 Aetas Technology, Incorporated Imaging-offset compensation methods and systems
US6532029B1 (en) * 2000-11-21 2003-03-11 Aetas Technology Incorporated Imaging-offset compensation methods and systems

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