JPS57664A - Image form - Google Patents

Image form

Info

Publication number
JPS57664A
JPS57664A JP7401880A JP7401880A JPS57664A JP S57664 A JPS57664 A JP S57664A JP 7401880 A JP7401880 A JP 7401880A JP 7401880 A JP7401880 A JP 7401880A JP S57664 A JPS57664 A JP S57664A
Authority
JP
Japan
Prior art keywords
latent image
potential
image
exposure
trial
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
JP7401880A
Other languages
Japanese (ja)
Inventor
Yasuhiro Okawa
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 JP7401880A priority Critical patent/JPS57664A/en
Publication of JPS57664A publication Critical patent/JPS57664A/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
    • G03G15/043—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 with means for controlling illumination or exposure

Landscapes

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

Abstract

PURPOSE:To obtain an always correct image contrast, by forming a preliminary latent image while changing exposure before forming a practicable latent image, measuring the potential of the trial latent image, and allowing an image contrast adjusting means to store its exposure for a given time when this measured value becomes a predetermined value. CONSTITUTION:A potential sensor 10 situated on the downstream of a corona discharger 3 detects the potential of a latent image on a photoreceptor 1. This sensor 10 measures the potential of a trial latent image on the photoreceptor 1 in the state where a lamp 13a is turned on and its intensity is changed whereas a lamp 13 for imagewise exposure, is turned off before the latent image to be used practically is formed. This measured value is fed back to a controller 11, where the measured value is compared with a predetermined target value, the potential of the trial latent image is approached to the target value by computing this difference with a certain constant or a function, thus permitting the exposure quantity determined by this computation to be set in the central part of a density adjusting dial, and a standard image to be obtained.
JP7401880A 1980-06-02 1980-06-02 Image form Pending JPS57664A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7401880A JPS57664A (en) 1980-06-02 1980-06-02 Image form

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7401880A JPS57664A (en) 1980-06-02 1980-06-02 Image form

Publications (1)

Publication Number Publication Date
JPS57664A true JPS57664A (en) 1982-01-05

Family

ID=13534943

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7401880A Pending JPS57664A (en) 1980-06-02 1980-06-02 Image form

Country Status (1)

Country Link
JP (1) JPS57664A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60213964A (en) * 1984-03-16 1985-10-26 アグファ　ゲーヴェルト　アクチエンゲゼルシャフト Method and apparatus for maintaining given potential ratio when electrostatically charged photosensitive layer is exposed to light
JPH02102210U (en) * 1989-01-30 1990-08-14

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60213964A (en) * 1984-03-16 1985-10-26 アグファ　ゲーヴェルト　アクチエンゲゼルシャフト Method and apparatus for maintaining given potential ratio when electrostatically charged photosensitive layer is exposed to light
JPH02102210U (en) * 1989-01-30 1990-08-14

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