JPS5794757A - Copy density adjusting device - Google Patents

Copy density adjusting device

Info

Publication number
JPS5794757A
JPS5794757A JP55170546A JP17054680A JPS5794757A JP S5794757 A JPS5794757 A JP S5794757A JP 55170546 A JP55170546 A JP 55170546A JP 17054680 A JP17054680 A JP 17054680A JP S5794757 A JPS5794757 A JP S5794757A
Authority
JP
Japan
Prior art keywords
original
photosensitive layer
developing
illuminating light
ground color
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
JP55170546A
Other languages
Japanese (ja)
Inventor
Tetsuo Sakurai
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 JP55170546A priority Critical patent/JPS5794757A/en
Publication of JPS5794757A publication Critical patent/JPS5794757A/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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/065—Arrangements for controlling the potential of the developing electrode

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Developing For Electrophotography (AREA)

Abstract

PURPOSE:To obtain a spotless copy by maximizing the amount of illuminating light for an original having dark ground color and at the same time, self-biasing the developing electrode. CONSTITUTION:For an original 5 having dark ground color, illuminating light is strengthened by turning fluorescent lamps 6, 7 equipped with an aperture, when they are turned to the maximum graduation, the graduated dial is stopped by a click mechanism. When the graduated dial is further turned beyond the stopping point, a switch operates and voltage applied to a developing sleeve 20 is changed from fixed voltage to the same electric potential with the photosensitive layer support of a drum 1, and the developing bias becomes self-bias that varies with the surface potential of the photosensitive layer.
JP55170546A 1980-12-03 1980-12-03 Copy density adjusting device Pending JPS5794757A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55170546A JPS5794757A (en) 1980-12-03 1980-12-03 Copy density adjusting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55170546A JPS5794757A (en) 1980-12-03 1980-12-03 Copy density adjusting device

Publications (1)

Publication Number Publication Date
JPS5794757A true JPS5794757A (en) 1982-06-12

Family

ID=15906883

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55170546A Pending JPS5794757A (en) 1980-12-03 1980-12-03 Copy density adjusting device

Country Status (1)

Country Link
JP (1) JPS5794757A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59232366A (en) * 1983-06-15 1984-12-27 Canon Inc Electrophotographic copying method
JPS60263172A (en) * 1984-06-11 1985-12-26 Sharp Corp Image correcting method of copying machine
JPS6187172A (en) * 1984-10-05 1986-05-02 Ricoh Co Ltd Forming method of picture
JPS62280871A (en) * 1986-05-30 1987-12-05 Canon Inc Image forming device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59232366A (en) * 1983-06-15 1984-12-27 Canon Inc Electrophotographic copying method
JPS60263172A (en) * 1984-06-11 1985-12-26 Sharp Corp Image correcting method of copying machine
JPS6187172A (en) * 1984-10-05 1986-05-02 Ricoh Co Ltd Forming method of picture
JPS62280871A (en) * 1986-05-30 1987-12-05 Canon Inc Image forming device

Similar Documents

Publication Publication Date Title
JPS5794757A (en) Copy density adjusting device
JPS54153038A (en) Automatic exposure control device of electrophoto graphic copier
JPS5586061A (en) Thin type discharge lamp
AU570307B2 (en) Exposure control of electrostatically charged light-sensitive layers
JPS5484738A (en) Developing device for variable magnification copier
JPS5271241A (en) Electrophotographic light sensitive material
JPS5723972A (en) Control method for development bias
JPS56113160A (en) Electrophotographic method
JPS5735882A (en) Electrophotographic copier
JPS5529862A (en) Electrocopying apparatus
GB2006464A (en) Improved Electrophotographic Plate
JPS5642242A (en) Electrophotographic method
JPS5655957A (en) Potential control method
JPS57118257A (en) Image formation apparatus
JPS5722270A (en) Electrophotographic device
JPS57163241A (en) Picture recording controller
JPS5710170A (en) Electrophotography method
US3816749A (en) Exposure controlled corona device
JPS55117156A (en) Copying control method
JPS5445138A (en) Exposure controller in electrophotographic copiers
JPS5722272A (en) Electrophotographic method
JPS56107671A (en) Light quantity correction device of facsimile
JPS5250242A (en) Control device for applying bias voltage to develop-electrode for elec trophotographic copying machine
JPS5553365A (en) Electrophotographic apparatus
JPS5217827A (en) Photosensitive material using carotenoid