JPS5734572A - Exposure stabilization device - Google Patents

Exposure stabilization device

Info

Publication number
JPS5734572A
JPS5734572A JP10952980A JP10952980A JPS5734572A JP S5734572 A JPS5734572 A JP S5734572A JP 10952980 A JP10952980 A JP 10952980A JP 10952980 A JP10952980 A JP 10952980A JP S5734572 A JPS5734572 A JP S5734572A
Authority
JP
Japan
Prior art keywords
photocurrent
lamps
constitution
terminals
optical fiber
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
JP10952980A
Other languages
Japanese (ja)
Inventor
Kiyoto Nagasawa
Masayuki Yamauchi
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 JP10952980A priority Critical patent/JPS5734572A/en
Publication of JPS5734572A publication Critical patent/JPS5734572A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/04036—Details of illuminating systems, e.g. lamps, reflectors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE:To keep the whole exposure always constant, by arranging each optical fiber bundle terminal to fluorescent lamps to detect the light quantity and controlling power supply to the lamps in accordance with the output synthesized. CONSTITUTION:The terminals of the bundles 6, 7 of an optical fiber cable 8 are arranged to fluorescent lamps 2, 3 illuminating an original face, and the other terminals illuminate the photodiode 9 of a control circuit 10, resulting in generating a photocurrent almost proportional to the sum of the light quantity received by the original. When the intensity of the lamps 2, 3 decreases with this constitution, the photocurrent of the diode 9 drops, and this change is compared with a reference voltage through operation amplifiers 11, 12. When the photocurrent decreases, the differencial becomes higher, the impact coefficient D of output pulse of a pulse modulator 13 increases, extending a conduction time of a switching circuit 27 and raising lamp powers. Vice versa when the photocurrent is larger, permitting the whole exposure to be kept always constant.
JP10952980A 1980-08-09 1980-08-09 Exposure stabilization device Pending JPS5734572A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10952980A JPS5734572A (en) 1980-08-09 1980-08-09 Exposure stabilization device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10952980A JPS5734572A (en) 1980-08-09 1980-08-09 Exposure stabilization device

Publications (1)

Publication Number Publication Date
JPS5734572A true JPS5734572A (en) 1982-02-24

Family

ID=14512561

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10952980A Pending JPS5734572A (en) 1980-08-09 1980-08-09 Exposure stabilization device

Country Status (1)

Country Link
JP (1) JPS5734572A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58154944U (en) * 1982-04-12 1983-10-17 コピア株式会社 Copying machine start point detection device
EP0092038A2 (en) * 1982-04-20 1983-10-26 Develop Dr. Eisbein GmbH & Co. Exposure device for a copying apparatus
JPS6054561A (en) * 1983-09-05 1985-03-29 Ricoh Co Ltd Optical output stabilizing device
FR2597219A1 (en) * 1986-04-11 1987-10-16 Canon Kk Apparatus for forming images and processing cartridge for this apparatus
EP0291943A2 (en) * 1987-05-21 1988-11-23 Sharp Kabushiki Kaisha State detecting arrangement
JPH0326130U (en) * 1989-07-26 1991-03-18

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5511606A (en) * 1978-07-11 1980-01-26 Hitachi Ltd Photoelectric conversion device
JPS5518645A (en) * 1978-07-25 1980-02-08 Ikeda Denki Kk Automatic exposure control type lighting device of copying machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5511606A (en) * 1978-07-11 1980-01-26 Hitachi Ltd Photoelectric conversion device
JPS5518645A (en) * 1978-07-25 1980-02-08 Ikeda Denki Kk Automatic exposure control type lighting device of copying machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58154944U (en) * 1982-04-12 1983-10-17 コピア株式会社 Copying machine start point detection device
EP0092038A2 (en) * 1982-04-20 1983-10-26 Develop Dr. Eisbein GmbH & Co. Exposure device for a copying apparatus
EP0092038A3 (en) * 1982-04-20 1984-07-18 Develop Dr. Eisbein GmbH & Co. Exposure device for a copying apparatus
JPS6054561A (en) * 1983-09-05 1985-03-29 Ricoh Co Ltd Optical output stabilizing device
FR2597219A1 (en) * 1986-04-11 1987-10-16 Canon Kk Apparatus for forming images and processing cartridge for this apparatus
EP0291943A2 (en) * 1987-05-21 1988-11-23 Sharp Kabushiki Kaisha State detecting arrangement
JPH0326130U (en) * 1989-07-26 1991-03-18

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