JPS562780A - Original reader - Google Patents

Original reader

Info

Publication number
JPS562780A
JPS562780A JP7812279A JP7812279A JPS562780A JP S562780 A JPS562780 A JP S562780A JP 7812279 A JP7812279 A JP 7812279A JP 7812279 A JP7812279 A JP 7812279A JP S562780 A JPS562780 A JP S562780A
Authority
JP
Japan
Prior art keywords
light
conversion element
photoelectric conversion
light source
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
JP7812279A
Other languages
Japanese (ja)
Inventor
Yuichi Nishimura
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu Electric 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP7812279A priority Critical patent/JPS562780A/en
Publication of JPS562780A publication Critical patent/JPS562780A/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
    • H04N1/40—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)
  • Facsimile Heads (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE:To eliminate stripes of light and shade generated for recording, by controlling the photoelectric charge storage time of a photoelectric conversion element according to the light quantity of a light source for illumination to make it possible to obtain always the read output of a fixed level. CONSTITUTION:Original 1 is illuminated by light source 2 such as a lamp, and the reflection light beam according to light and shade of original 1 is condensed by lens 3 of original reader 10 and is received by the first photoelectric conversion element 4. The second photoelectric conversion element 31 opposite to light source 2 is arranged in reader 10, and an electric output corresponding to the light quantity of light source 2 is generated by this photoelectric conversion element 31, and control pulses of a period according to the light quantity of light source 2 are generated from read control circuit 33 on a basis of this electric output, and the output of control circuit 33 is applied to photoelectric conversion element 4. Then, the electric charge storage time of buffer memory 32 where the output of photoelectric conversion element 4 is input is controlled to make always the signal output to modulator 6 fixed-level, thereby eliminating stripes of light and shade generated for recording.
JP7812279A 1979-06-22 1979-06-22 Original reader Pending JPS562780A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7812279A JPS562780A (en) 1979-06-22 1979-06-22 Original reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7812279A JPS562780A (en) 1979-06-22 1979-06-22 Original reader

Publications (1)

Publication Number Publication Date
JPS562780A true JPS562780A (en) 1981-01-13

Family

ID=13653072

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7812279A Pending JPS562780A (en) 1979-06-22 1979-06-22 Original reader

Country Status (1)

Country Link
JP (1) JPS562780A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848561A (en) * 1981-09-18 1983-03-22 Hitachi Ltd CCD photosensor accumulation time control circuit
JPS58170168A (en) * 1982-03-30 1983-10-06 Fujitsu Ltd Driving system of image sensor
JPS58196758A (en) * 1982-05-12 1983-11-16 Hitachi Ltd Light receiving element
JPS5995769A (en) * 1982-11-25 1984-06-01 Hitachi Ltd CCD sensor drive device
JPS6374257A (en) * 1986-09-17 1988-04-04 Ricoh Co Ltd Image reading device
JPS6359304U (en) * 1986-10-06 1988-04-20

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848561A (en) * 1981-09-18 1983-03-22 Hitachi Ltd CCD photosensor accumulation time control circuit
JPS58170168A (en) * 1982-03-30 1983-10-06 Fujitsu Ltd Driving system of image sensor
JPS58196758A (en) * 1982-05-12 1983-11-16 Hitachi Ltd Light receiving element
JPS5995769A (en) * 1982-11-25 1984-06-01 Hitachi Ltd CCD sensor drive device
JPS6374257A (en) * 1986-09-17 1988-04-04 Ricoh Co Ltd Image reading device
JPS6359304U (en) * 1986-10-06 1988-04-20

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