JPS56132866A - Drum type scanner - Google Patents

Drum type scanner

Info

Publication number
JPS56132866A
JPS56132866A JP3643880A JP3643880A JPS56132866A JP S56132866 A JPS56132866 A JP S56132866A JP 3643880 A JP3643880 A JP 3643880A JP 3643880 A JP3643880 A JP 3643880A JP S56132866 A JPS56132866 A JP S56132866A
Authority
JP
Japan
Prior art keywords
rotation
pulse
drum
counter
output
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
JP3643880A
Other languages
Japanese (ja)
Inventor
Tsutomu Sato
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 JP3643880A priority Critical patent/JPS56132866A/en
Publication of JPS56132866A publication Critical patent/JPS56132866A/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
    • H04N1/0473—Detection, control or error compensation of scanning velocity or position in subscanning direction, e.g. picture start or line-to-line synchronisation

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE:To make subscanning synchronize exactly with main scanning, by connecting an encoder with the drum shaft, generating a speed designating pulse from the pulse generated by the encoder, and making the rotation of the drum synchronize by said pulse. CONSTITUTION:The encoder connected to the drum shaft 1a has a rotary plate 10, and when this rotary plate 10 rotates, 2 groups of pulses are output from the photodiodes PD-A, PD-B. 360 pulses per one rotation of the drum are output from the photodiode PD-B, and they are input to the counter CO. A speed command pulse is output from the counter CO, and it is inputted to the exciting circuit subscanning motor 7 through the AND gate A1. One pulse per one rotation of the drum is generated from the photodiode PD-A, and it clears the counter CO. Accordingly, miscount in one rotation does not exert influence on the next rotation.
JP3643880A 1980-03-21 1980-03-21 Drum type scanner Pending JPS56132866A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3643880A JPS56132866A (en) 1980-03-21 1980-03-21 Drum type scanner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3643880A JPS56132866A (en) 1980-03-21 1980-03-21 Drum type scanner

Publications (1)

Publication Number Publication Date
JPS56132866A true JPS56132866A (en) 1981-10-17

Family

ID=12469812

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3643880A Pending JPS56132866A (en) 1980-03-21 1980-03-21 Drum type scanner

Country Status (1)

Country Link
JP (1) JPS56132866A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61261754A (en) * 1985-05-16 1986-11-19 Shinko Electric Co Ltd Image forming device
JPS6429164A (en) * 1987-07-24 1989-01-31 Matsushita Electric Ind Co Ltd Picture scanner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61261754A (en) * 1985-05-16 1986-11-19 Shinko Electric Co Ltd Image forming device
JPS6429164A (en) * 1987-07-24 1989-01-31 Matsushita Electric Ind Co Ltd Picture scanner

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