JPS57127360A - Reader of picture information - Google Patents

Reader of picture information

Info

Publication number
JPS57127360A
JPS57127360A JP56012433A JP1243381A JPS57127360A JP S57127360 A JPS57127360 A JP S57127360A JP 56012433 A JP56012433 A JP 56012433A JP 1243381 A JP1243381 A JP 1243381A JP S57127360 A JPS57127360 A JP S57127360A
Authority
JP
Japan
Prior art keywords
pulse
circuit
light source
prescribed
secondary scanning
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.)
Granted
Application number
JP56012433A
Other languages
Japanese (ja)
Other versions
JPH0318386B2 (en
Inventor
Yojiro 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 JP56012433A priority Critical patent/JPS57127360A/en
Publication of JPS57127360A publication Critical patent/JPS57127360A/en
Publication of JPH0318386B2 publication Critical patent/JPH0318386B2/ja
Granted 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
    • H04N1/40—Picture signal circuits
    • H04N1/40056—Circuits for driving or energising particular reading heads or original illumination means

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Image Input (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE:To increase the image resolution in the secondary scanning direction during the reading of picture information, by giving a prescribed quantity of exposure at all times to an original which has no relation with the fluctuation of the secondary scanning speed. CONSTITUTION:The pulse Pt produced from a shift degree detecting circuit TPG is supplied to a pulse generating circuit PSG. The circuit PSG produces a light source drive pulse Pl having a prescribed width and a rise at a prescribed time position to the time position of the pulse Pt, a start pulse Pr for reading plus a driving clock pulse of image sensor IS respectively. The pulse Pl is applied to a light source drive circuit LD, and the circuit LD applies the amplified pulse to an illuminating light source LS. Thus an original O is illuminated by the source LS and in a prescribed time width. The period T of a picture signal supplied from the sensor IS is always constant regardless of the secondary scanning speed of a reader.
JP56012433A 1981-01-30 1981-01-30 Reader of picture information Granted JPS57127360A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56012433A JPS57127360A (en) 1981-01-30 1981-01-30 Reader of picture information

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56012433A JPS57127360A (en) 1981-01-30 1981-01-30 Reader of picture information

Publications (2)

Publication Number Publication Date
JPS57127360A true JPS57127360A (en) 1982-08-07
JPH0318386B2 JPH0318386B2 (en) 1991-03-12

Family

ID=11805149

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56012433A Granted JPS57127360A (en) 1981-01-30 1981-01-30 Reader of picture information

Country Status (1)

Country Link
JP (1) JPS57127360A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60157A (en) * 1983-06-15 1985-01-05 Canon Inc Picture input device
JPS60109374A (en) * 1983-11-14 1985-06-14 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Scanning device
JPS61133765A (en) * 1984-12-03 1986-06-21 Minolta Camera Co Ltd Image reader
JPH0225158A (en) * 1988-07-14 1990-01-26 Fujitsu Ltd Image information reader
JPH0484559A (en) * 1990-07-27 1992-03-17 Hitachi Ltd Facsimile equipment

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5586264A (en) * 1978-12-25 1980-06-28 Mitsubishi Electric Corp Original reader

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5586264A (en) * 1978-12-25 1980-06-28 Mitsubishi Electric Corp Original reader

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60157A (en) * 1983-06-15 1985-01-05 Canon Inc Picture input device
JPH0336351B2 (en) * 1983-06-15 1991-05-31 Canon Kk
JPS60109374A (en) * 1983-11-14 1985-06-14 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Scanning device
JPS61133765A (en) * 1984-12-03 1986-06-21 Minolta Camera Co Ltd Image reader
JPH0225158A (en) * 1988-07-14 1990-01-26 Fujitsu Ltd Image information reader
JPH0484559A (en) * 1990-07-27 1992-03-17 Hitachi Ltd Facsimile equipment

Also Published As

Publication number Publication date
JPH0318386B2 (en) 1991-03-12

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