JPS55117164A - Image forming device - Google Patents

Image forming device

Info

Publication number
JPS55117164A
JPS55117164A JP2489679A JP2489679A JPS55117164A JP S55117164 A JPS55117164 A JP S55117164A JP 2489679 A JP2489679 A JP 2489679A JP 2489679 A JP2489679 A JP 2489679A JP S55117164 A JPS55117164 A JP S55117164A
Authority
JP
Japan
Prior art keywords
correction
outputs
potentials
destaticizer
inputted
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
JP2489679A
Other languages
Japanese (ja)
Inventor
Koji Suzuki
Yoshitaka Kawamo
Yoshikazu Yokomizo
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP2489679A priority Critical patent/JPS55117164A/en
Publication of JPS55117164A publication Critical patent/JPS55117164A/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)

Abstract

PURPOSE:To obtain the image forming device which is capable of maintaing contrast constant even against temperature change and aging by obtaining the output of the difference of the surface potentials of the bright part and dark part on a recording body and controlling charging outputs thereby performing the correction of the surface potentials. CONSTITUTION:Electrostatic latent images are formed on a photosensitive drum 47 by a primary charger 51, secondary destaticizer 69 and full surface exposure lamp 68. At this time, a surface electrometer 67 is provided between the exposure lamp 68 and developing roller 65. The potentials of the dark part and bright part of the latent images are measured and are converted to DC signals by a potential sensor and measuring circuit 107. The detection outputs are inputted to an arithmetic circuit 114, and the correction values are obtained by the specified operation formula. These are then inputted to an integrating circuit 119 where they are subjected to comparative computation with the current values having been stored. The primary charger 51, secondary destaticizer 69 and developing device 65 are controlled by these correction outputs. Thereby, the contrast may be maintained constant even if the potential characteristics of the recording body vary.
JP2489679A 1979-03-02 1979-03-02 Image forming device Pending JPS55117164A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2489679A JPS55117164A (en) 1979-03-02 1979-03-02 Image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2489679A JPS55117164A (en) 1979-03-02 1979-03-02 Image forming device

Publications (1)

Publication Number Publication Date
JPS55117164A true JPS55117164A (en) 1980-09-09

Family

ID=12150940

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2489679A Pending JPS55117164A (en) 1979-03-02 1979-03-02 Image forming device

Country Status (1)

Country Link
JP (1) JPS55117164A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0589539A1 (en) * 1987-01-19 1994-03-30 Canon Kabushiki Kaisha Image forming apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5417847A (en) * 1977-07-11 1979-02-09 Canon Inc Control method for electrophotography

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5417847A (en) * 1977-07-11 1979-02-09 Canon Inc Control method for electrophotography

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0589539A1 (en) * 1987-01-19 1994-03-30 Canon Kabushiki Kaisha Image forming apparatus
US5473415A (en) * 1987-01-19 1995-12-05 Canon Kabushiki Kaisha Image forming apparatus having a converter for image data characteristics

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