JPS56146150A - Electrophotographic copier - Google Patents

Electrophotographic copier

Info

Publication number
JPS56146150A
JPS56146150A JP5009780A JP5009780A JPS56146150A JP S56146150 A JPS56146150 A JP S56146150A JP 5009780 A JP5009780 A JP 5009780A JP 5009780 A JP5009780 A JP 5009780A JP S56146150 A JPS56146150 A JP S56146150A
Authority
JP
Japan
Prior art keywords
drum
sensor
recess
buried
highly accurately
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
JP5009780A
Other languages
Japanese (ja)
Inventor
Takashi Inoue
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 JP5009780A priority Critical patent/JPS56146150A/en
Publication of JPS56146150A publication Critical patent/JPS56146150A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To detect the quantity of the light conducted onto the surface of a photosensitive drum highly accurately by providing an optical sensor buried in the surface of said drum in the region other than the original image region. CONSTITUTION:The image of an original to be copied is projected to the shaded part S of a photosensitive drum 9 and an optical sensor 11 is buried in the part K other than this shaded part S. Namely, a recess 10 is formed in the surface of the drum 9, and the sensor 11 is fixed in the bottom of the recess 10. A right transmitting part 12 is a transparent body of glass or the like and is made to the curved shape of the same radius as that of the surface of the drum 9. Therefore, the sensor 11 is prevented from being stained by powder dusts such as the toner, and since the surface of the part 12 is cleaned by cleaning at every copying, the detection of the quantity of the light of the sensor 11 is maintained highly accurately.
JP5009780A 1980-04-15 1980-04-15 Electrophotographic copier Pending JPS56146150A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5009780A JPS56146150A (en) 1980-04-15 1980-04-15 Electrophotographic copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5009780A JPS56146150A (en) 1980-04-15 1980-04-15 Electrophotographic copier

Publications (1)

Publication Number Publication Date
JPS56146150A true JPS56146150A (en) 1981-11-13

Family

ID=12849555

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5009780A Pending JPS56146150A (en) 1980-04-15 1980-04-15 Electrophotographic copier

Country Status (1)

Country Link
JP (1) JPS56146150A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60201370A (en) * 1984-03-26 1985-10-11 Ricoh Co Ltd Electrophotographic copying machine
JPS60190310U (en) * 1984-05-28 1985-12-17 長田電機工業株式会社 Contact type laser scalpel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60201370A (en) * 1984-03-26 1985-10-11 Ricoh Co Ltd Electrophotographic copying machine
JPS60190310U (en) * 1984-05-28 1985-12-17 長田電機工業株式会社 Contact type laser scalpel
JPH019545Y2 (en) * 1984-05-28 1989-03-16

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