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JPS57136862A - Generating method for light beam scanning timing signal - Google Patents

Generating method for light beam scanning timing signal

Info

Publication number
JPS57136862A
JPS57136862A JP56022687A JP2268781A JPS57136862A JP S57136862 A JPS57136862 A JP S57136862A JP 56022687 A JP56022687 A JP 56022687A JP 2268781 A JP2268781 A JP 2268781A JP S57136862 A JPS57136862 A JP S57136862A
Authority
JP
Japan
Prior art keywords
output
photodetector
scanning start
timing signal
timing
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
JP56022687A
Other languages
Japanese (ja)
Inventor
Masaaki Oyabu
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP56022687A priority Critical patent/JPS57136862A/en
Publication of JPS57136862A publication Critical patent/JPS57136862A/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
    • H04N1/047—Detection, control or error compensation of scanning velocity or position
    • H04N1/053—Detection, control or error compensation of scanning velocity or position in main scanning direction, e.g. synchronisation of line start or picture elements in a line

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

PURPOSE:To keep scanning start timing constant by holding and dividing the peak value of a photodetector output by (n) and generating scanning start signal when said 1/n-fold output coincidents with the photodetector output. CONSTITUTION:A laser beam generated by a generator 1 is made to scan on a photoreceptor 4, charged previously with prescribed polarity, axially through a rotary polygon mirror 2, thereby forming an electrostatic latent image on the photoreceptor 4. The timing for starting the modulation of the laser beam is set by a photodetector 3 arranged near a scanning start position. The output of the photodetector 3 is amplified by an amplifier 5 and its peak value is held by a peak detector 6 and further reduced to 1/n by an attenuator 7. This 1/n- fold output and the output of the amplifier 5 are compared by a comparator 8 and when the both are coincident with each other, a scanning start timing signal is generated. Therefore, even if the output of the photodetector 3 varies, accurate timing is obtained.
JP56022687A 1981-02-17 1981-02-17 Generating method for light beam scanning timing signal Pending JPS57136862A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56022687A JPS57136862A (en) 1981-02-17 1981-02-17 Generating method for light beam scanning timing signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56022687A JPS57136862A (en) 1981-02-17 1981-02-17 Generating method for light beam scanning timing signal

Publications (1)

Publication Number Publication Date
JPS57136862A true JPS57136862A (en) 1982-08-24

Family

ID=12089777

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56022687A Pending JPS57136862A (en) 1981-02-17 1981-02-17 Generating method for light beam scanning timing signal

Country Status (1)

Country Link
JP (1) JPS57136862A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61159863A (en) * 1984-12-29 1986-07-19 Konishiroku Photo Ind Co Ltd Laser beam printer
JPS62237417A (en) * 1986-04-08 1987-10-17 Canon Inc Recording device
JPS6344618A (en) * 1986-08-12 1988-02-25 Asahi Optical Co Ltd Horizontal synchronizing device for laser printer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61159863A (en) * 1984-12-29 1986-07-19 Konishiroku Photo Ind Co Ltd Laser beam printer
JPS62237417A (en) * 1986-04-08 1987-10-17 Canon Inc Recording device
JPS6344618A (en) * 1986-08-12 1988-02-25 Asahi Optical Co Ltd Horizontal synchronizing device for laser printer
JPH0658463B2 (en) * 1986-08-12 1994-08-03 旭光学工業株式会社 Horizontal synchronizer for laser beam printer

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