JPS55130535A - Exposure lamp control circuit of copying apparatus - Google Patents

Exposure lamp control circuit of copying apparatus

Info

Publication number
JPS55130535A
JPS55130535A JP3821679A JP3821679A JPS55130535A JP S55130535 A JPS55130535 A JP S55130535A JP 3821679 A JP3821679 A JP 3821679A JP 3821679 A JP3821679 A JP 3821679A JP S55130535 A JPS55130535 A JP S55130535A
Authority
JP
Japan
Prior art keywords
digital
control circuit
circuit
set signal
exposure
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
JP3821679A
Other languages
Japanese (ja)
Inventor
Hisao Tezuka
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP3821679A priority Critical patent/JPS55130535A/en
Publication of JPS55130535A publication Critical patent/JPS55130535A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Of Exposure In Printing And Copying (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To achieve smaller size and higher reliability by processing the exposure set signal of digital values in the form of digital values. CONSTITUTION:An A/D converter 12, central processing unit 13 and digital phase control circuit 14 are connected between a density detecting circuit 11 and a lighting circuit 15. As a result of this, the image density detection value of the original is converted to a digital value, after which it is inputted to the central processing unit 13, from which the exposure set signal being digital quantity is outputted to the digital phase control circuit 14 to form the pulses having the time interval corresponding to the exposure set signal. A lighting circuit 15 is triggered by this signal and the effective power to be applied to an exposure lamp 16 is increased or decreased. Hence, the circuit is constituted at low cost and with a small size by using general-purpose integrated circuits; in addition, the reliability becomes higher because it is difficult to receive the effect of drift.
JP3821679A 1979-03-30 1979-03-30 Exposure lamp control circuit of copying apparatus Pending JPS55130535A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3821679A JPS55130535A (en) 1979-03-30 1979-03-30 Exposure lamp control circuit of copying apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3821679A JPS55130535A (en) 1979-03-30 1979-03-30 Exposure lamp control circuit of copying apparatus

Publications (1)

Publication Number Publication Date
JPS55130535A true JPS55130535A (en) 1980-10-09

Family

ID=12519108

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3821679A Pending JPS55130535A (en) 1979-03-30 1979-03-30 Exposure lamp control circuit of copying apparatus

Country Status (1)

Country Link
JP (1) JPS55130535A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58172654A (en) * 1982-04-02 1983-10-11 Canon Inc Control device of image recording
JPS5915264A (en) * 1982-07-19 1984-01-26 Konishiroku Photo Ind Co Ltd Picture control device of copying machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS511113A (en) * 1974-06-21 1976-01-07 Ricoh Kk

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS511113A (en) * 1974-06-21 1976-01-07 Ricoh Kk

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58172654A (en) * 1982-04-02 1983-10-11 Canon Inc Control device of image recording
JPS5915264A (en) * 1982-07-19 1984-01-26 Konishiroku Photo Ind Co Ltd Picture control device of copying machine
JPH0451825B2 (en) * 1982-07-19 1992-08-20 Konishiroku Photo Ind

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