JPS5742056A - Electrostatic printing control method - Google Patents

Electrostatic printing control method

Info

Publication number
JPS5742056A
JPS5742056A JP55118835A JP11883580A JPS5742056A JP S5742056 A JPS5742056 A JP S5742056A JP 55118835 A JP55118835 A JP 55118835A JP 11883580 A JP11883580 A JP 11883580A JP S5742056 A JPS5742056 A JP S5742056A
Authority
JP
Japan
Prior art keywords
part potential
contrast
photoreceptor
measured
electrostatic
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
JP55118835A
Other languages
Japanese (ja)
Inventor
Tsutomu Sato
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 JP55118835A priority Critical patent/JPS5742056A/en
Publication of JPS5742056A publication Critical patent/JPS5742056A/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
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0266—Arrangements for controlling the amount of charge

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To increase the number of sheets capable of printing by measuring the bright part potential and dark part potential of a photoreceptor, taking the difference of both thereof, correcting the quantity of AC electric charge and controlling the bias voltage during developing. CONSTITUTION:First, the bright part potential and dark part potential of a photoreceptor in standard conditions as references are measured with a surface elctrometer, and reference electrostatic contrast Vc<o> is calculated by a control circuit and is beforehand selected. Next, with an actual electrostatic latent image, its dark part potential and bright part potential are measured, and electrostatic contrast Vc is calculted by the control circuit. This is compared with the reference value Vc<o>, and such AC electric charging conditions under which the electrostatic contrast is made constant are calculated. Next, AC charging is applied on the photoreceptor, after which the dark part potential and bright part potential are measured and the bias voltage to be applied to a developing device is so controlled that the contrast Vc attains a constant value, whereby the electrostatic contrast is compensated. Such compensation is accomplished at every one time of copying.
JP55118835A 1980-08-28 1980-08-28 Electrostatic printing control method Pending JPS5742056A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55118835A JPS5742056A (en) 1980-08-28 1980-08-28 Electrostatic printing control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55118835A JPS5742056A (en) 1980-08-28 1980-08-28 Electrostatic printing control method

Publications (1)

Publication Number Publication Date
JPS5742056A true JPS5742056A (en) 1982-03-09

Family

ID=14746327

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55118835A Pending JPS5742056A (en) 1980-08-28 1980-08-28 Electrostatic printing control method

Country Status (1)

Country Link
JP (1) JPS5742056A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2618918A1 (en) * 1987-07-28 1989-02-03 Canon Kk ELECTROPHOTOGRAPHIC APPARATUS AND IMAGE FORMING METHOD

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2618918A1 (en) * 1987-07-28 1989-02-03 Canon Kk ELECTROPHOTOGRAPHIC APPARATUS AND IMAGE FORMING METHOD

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