JPS57212864A - Light source device - Google Patents

Light source device

Info

Publication number
JPS57212864A
JPS57212864A JP56098547A JP9854781A JPS57212864A JP S57212864 A JPS57212864 A JP S57212864A JP 56098547 A JP56098547 A JP 56098547A JP 9854781 A JP9854781 A JP 9854781A JP S57212864 A JPS57212864 A JP S57212864A
Authority
JP
Japan
Prior art keywords
data
light source
memory
power supply
time
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
JP56098547A
Other languages
Japanese (ja)
Inventor
Toshiaki Naka
Fumiaki Yamada
Masuji Sato
Minoru Terajima
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56098547A priority Critical patent/JPS57212864A/en
Publication of JPS57212864A publication Critical patent/JPS57212864A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE:To keep intensity of illumination almost constant at the irradiated plane after the start of light source illumination, by changing voltage, current or duty ratio of pulse applied to the light source with the time. CONSTITUTION:A data charging a power supply voltage with time is stored in a memory 8. When an original is detected and a clock pulse generating section 9 is operated, a CPU 10 reads out a data D1 from the memory 8. The data D1 is converted from a power supply voltage Vs to V1 via a D/A conveter 11 and a buffer 12 to drive a light emitting diode 1. Similarly, data D2-Dn are read out from the memory 8 at each specified time and they are converted into power supply voltages V2-Vn corresponding to the data D2-Dn to drive a light emitting diode 1.
JP56098547A 1981-06-25 1981-06-25 Light source device Pending JPS57212864A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56098547A JPS57212864A (en) 1981-06-25 1981-06-25 Light source device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56098547A JPS57212864A (en) 1981-06-25 1981-06-25 Light source device

Publications (1)

Publication Number Publication Date
JPS57212864A true JPS57212864A (en) 1982-12-27

Family

ID=14222710

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56098547A Pending JPS57212864A (en) 1981-06-25 1981-06-25 Light source device

Country Status (1)

Country Link
JP (1) JPS57212864A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61190673A (en) * 1985-02-19 1986-08-25 Nippon Denso Co Ltd Optical information reading device
JPH03198468A (en) * 1989-12-27 1991-08-29 Canon Inc Picture reader
US5296944A (en) * 1990-06-18 1994-03-22 Iwatsu Electric Co. Ltd. Image scanner and dynamic range adjusting method thereof
JP2013239339A (en) * 2012-05-15 2013-11-28 Sharp Corp Illumination device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61190673A (en) * 1985-02-19 1986-08-25 Nippon Denso Co Ltd Optical information reading device
JPH03198468A (en) * 1989-12-27 1991-08-29 Canon Inc Picture reader
US5296944A (en) * 1990-06-18 1994-03-22 Iwatsu Electric Co. Ltd. Image scanner and dynamic range adjusting method thereof
JP2013239339A (en) * 2012-05-15 2013-11-28 Sharp Corp Illumination device

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