JPS6487257A - Luminous amount control device - Google Patents

Luminous amount control device

Info

Publication number
JPS6487257A
JPS6487257A JP24364487A JP24364487A JPS6487257A JP S6487257 A JPS6487257 A JP S6487257A JP 24364487 A JP24364487 A JP 24364487A JP 24364487 A JP24364487 A JP 24364487A JP S6487257 A JPS6487257 A JP S6487257A
Authority
JP
Japan
Prior art keywords
objective
analog
converter
converted
luminous
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
JP24364487A
Other languages
Japanese (ja)
Inventor
Makoto Abe
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP24364487A priority Critical patent/JPS6487257A/en
Publication of JPS6487257A publication Critical patent/JPS6487257A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Laser Beam Printer (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Semiconductor Lasers (AREA)

Abstract

PURPOSE:To increase the extended processing performance of CPU and simplify a circuit composition by outputting an objective value for bias current against the first luminous amount control system and an objective value for oscillation current against the second luminous amount control system selectively from a common output port, and outputting the objective values for bias current and oscillation current to the first or second luminous amount control system while maintaining the both objective values using an analog circuit. CONSTITUTION:An objective value for bias current Db or an objective value for oscillation current Dp which are output CPU 21 acting as a luminous energy control means concurrently, is converted by a D/A converter, and the first or second objective voltage signal for analog luminous energy which is converted by the D/A converter is output to a back stage analog switching circuit 2. The first objective voltage signal for analog luminous amount converted by the D/A converter is output to a voltage holding circuit 3a, and the second objective voltage signal for analog luminous amount converted by the D/A converter is output to a voltage holding circuit 3b. In addition, the voltage holding circuits 3a, 3b hold the first or second voltage signal for analog luminous amount control converted by the D/A converter for a prearranged time.
JP24364487A 1987-09-30 1987-09-30 Luminous amount control device Pending JPS6487257A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24364487A JPS6487257A (en) 1987-09-30 1987-09-30 Luminous amount control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24364487A JPS6487257A (en) 1987-09-30 1987-09-30 Luminous amount control device

Publications (1)

Publication Number Publication Date
JPS6487257A true JPS6487257A (en) 1989-03-31

Family

ID=17106886

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24364487A Pending JPS6487257A (en) 1987-09-30 1987-09-30 Luminous amount control device

Country Status (1)

Country Link
JP (1) JPS6487257A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0214163A (en) * 1988-03-31 1990-01-18 Ricoh Co Ltd Controlling method for quantity of light by multivalue
JP2007303969A (en) * 2006-05-11 2007-11-22 Micronics Japan Co Ltd Probe and probe assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0214163A (en) * 1988-03-31 1990-01-18 Ricoh Co Ltd Controlling method for quantity of light by multivalue
JP2007303969A (en) * 2006-05-11 2007-11-22 Micronics Japan Co Ltd Probe and probe assembly

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