JPS5723972A - Control method for development bias - Google Patents

Control method for development bias

Info

Publication number
JPS5723972A
JPS5723972A JP9949980A JP9949980A JPS5723972A JP S5723972 A JPS5723972 A JP S5723972A JP 9949980 A JP9949980 A JP 9949980A JP 9949980 A JP9949980 A JP 9949980A JP S5723972 A JPS5723972 A JP S5723972A
Authority
JP
Japan
Prior art keywords
background
exposure
amount
potential
photoreceptor
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
JP9949980A
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 JP9949980A priority Critical patent/JPS5723972A/en
Publication of JPS5723972A publication Critical patent/JPS5723972A/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)
  • Control Or Security For Electrophotography (AREA)
  • Developing For Electrophotography (AREA)

Abstract

PURPOSE:To obtain copies without background, by grasping the characteristics of a photoreceptor from the amount of exposure by a reference pattern and a crrepage potential, and controlling the development bias voltage according to the light amount of background and creepage potential at original copying. CONSTITUTION:The amount of exposure of a reference pattern formed with specified dark and light regions 2A, 2B and the creepage potential of a photo sensing drum formed with this exposure are detected with sensors 17, 19 and a development bias operation controller 18 can operate and grasp the characteristic of a photoreceptor 10. Then, the amount of exposure and creepage potential of the background of an original 3 are detected with the sensors 17, 19 and applied to the device 18 to control the bias voltage of a developper 13. With this constitution, the copying without background and dirt can be made independently of time eging characteristic variance of the photoreceptor, and types of originals with different reflection factors of background.
JP9949980A 1980-07-21 1980-07-21 Control method for development bias Pending JPS5723972A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9949980A JPS5723972A (en) 1980-07-21 1980-07-21 Control method for development bias

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9949980A JPS5723972A (en) 1980-07-21 1980-07-21 Control method for development bias

Publications (1)

Publication Number Publication Date
JPS5723972A true JPS5723972A (en) 1982-02-08

Family

ID=14248970

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9949980A Pending JPS5723972A (en) 1980-07-21 1980-07-21 Control method for development bias

Country Status (1)

Country Link
JP (1) JPS5723972A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01501257A (en) * 1986-11-06 1989-04-27 イーストマン・コダック・カンパニー Dynamic feedforward process control for electronic copiers
JPH02119257U (en) * 1988-11-30 1990-09-26
JPH02259674A (en) * 1989-03-31 1990-10-22 Ricoh Co Ltd Original density detector
JPH03171068A (en) * 1989-11-30 1991-07-24 Mita Ind Co Ltd Image forming device
US5107302A (en) * 1988-10-28 1992-04-21 Ricoh Company, Ltd. Image density control device for an image forming apparatus
CN109861193A (en) * 2018-12-29 2019-06-07 樊嵩 A kind of earth leakage protecting method and its system of electric cabinet

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01501257A (en) * 1986-11-06 1989-04-27 イーストマン・コダック・カンパニー Dynamic feedforward process control for electronic copiers
US5107302A (en) * 1988-10-28 1992-04-21 Ricoh Company, Ltd. Image density control device for an image forming apparatus
JPH02119257U (en) * 1988-11-30 1990-09-26
JPH02259674A (en) * 1989-03-31 1990-10-22 Ricoh Co Ltd Original density detector
JPH03171068A (en) * 1989-11-30 1991-07-24 Mita Ind Co Ltd Image forming device
CN109861193A (en) * 2018-12-29 2019-06-07 樊嵩 A kind of earth leakage protecting method and its system of electric cabinet

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