JPS5790669A - Electrophotographic copier - Google Patents

Electrophotographic copier

Info

Publication number
JPS5790669A
JPS5790669A JP16580480A JP16580480A JPS5790669A JP S5790669 A JPS5790669 A JP S5790669A JP 16580480 A JP16580480 A JP 16580480A JP 16580480 A JP16580480 A JP 16580480A JP S5790669 A JPS5790669 A JP S5790669A
Authority
JP
Japan
Prior art keywords
pattern
light
driving
lamp
optical system
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
JP16580480A
Other languages
Japanese (ja)
Inventor
Makoto Kozu
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 JP16580480A priority Critical patent/JPS5790669A/en
Publication of JPS5790669A publication Critical patent/JPS5790669A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/522—Projection optics
    • G03B27/525—Projection optics for slit exposure
    • G03B27/526—Projection optics for slit exposure in which the projection optics move

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)

Abstract

PURPOSE:To make servo driving control possible in accurate synchronization with a motor for driving a photosensitive drum by providing a position detector for servocontrol for driving an optical system. CONSTITUTION:A position detecting pattern 11 is disposed near the original placing part of contact glass 1 and a photosensor 12 is installed near a slit near the position of a mirror 3 or an imaging part to detect the reflected light from the pattern 11 irradiated by the light of an original illuminating lamp 2 with the sensor 12, whereby a position detector for a moving optical system is constituted. The light of the lamp 2 is reflected by the pattern 11, and is detected with the sensor 12. Then the black pattern in white ground formed on the pattern 11 is detected. The output thereof is detected as the quantity of lamp light in a quantity of light detecting circuit 14, by which the lamp voltage is controlled. It is compared with the pulses from a drum speed detector 10 in a servocircuit 15, and in accordance with the phase difference thereof or pulse separation, it is applied as a control signal to a motor 16 for driving the optical system.
JP16580480A 1980-11-27 1980-11-27 Electrophotographic copier Pending JPS5790669A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16580480A JPS5790669A (en) 1980-11-27 1980-11-27 Electrophotographic copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16580480A JPS5790669A (en) 1980-11-27 1980-11-27 Electrophotographic copier

Publications (1)

Publication Number Publication Date
JPS5790669A true JPS5790669A (en) 1982-06-05

Family

ID=15819302

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16580480A Pending JPS5790669A (en) 1980-11-27 1980-11-27 Electrophotographic copier

Country Status (1)

Country Link
JP (1) JPS5790669A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59228238A (en) * 1983-06-08 1984-12-21 Fuji Xerox Co Ltd Exposure position controller for copying machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59228238A (en) * 1983-06-08 1984-12-21 Fuji Xerox Co Ltd Exposure position controller for copying machine
JPH0519144B2 (en) * 1983-06-08 1993-03-15 Fuji Xerox Co Ltd

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