JPS60133474A - Electrophotographic copying machine - Google Patents

Electrophotographic copying machine

Info

Publication number
JPS60133474A
JPS60133474A JP24246983A JP24246983A JPS60133474A JP S60133474 A JPS60133474 A JP S60133474A JP 24246983 A JP24246983 A JP 24246983A JP 24246983 A JP24246983 A JP 24246983A JP S60133474 A JPS60133474 A JP S60133474A
Authority
JP
Japan
Prior art keywords
photosensitive
original
photosensor
image
potential
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
JP24246983A
Other languages
Japanese (ja)
Inventor
Youichi Toudou
Original Assignee
Matsushita Electric Ind 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 Matsushita Electric Ind Co Ltd filed Critical Matsushita Electric Ind Co Ltd
Priority to JP24246983A priority Critical patent/JPS60133474A/en
Publication of JPS60133474A publication Critical patent/JPS60133474A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/02Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0266Arrangements for controlling the amount of charge

Abstract

PURPOSE:To compensate a lowering in the charge potential of a photosensitive body due to fatigue, etc., and maintain an invariably proper image by forming a reference visible image on the photosensitive body, detecting its reflection density by a photosensor, and controlling a high-voltage power source for electrostatic charging. CONSTITUTION:The photosensitive body 1 which is charged uniformly by a charger 2 is exposed to reflected light from a reference original 4 provided at an end part of contact glass 3 and an original 5 to form a reference electrostatic latent image and the electrostatic latent image of the original, and they are developed at a developing part 15 to form visible images. The reflection density of the reference visible image is detected by the photosensor 16, whose output is compared by a comparator 17 with a reference potential 18. The high-voltage power source 20 for electrostatic charging is brought under the feedback control of a control circuit 19 so that the photosensor output is equal to the reference potential all the time, namely, that the reference visible image density is invariably constant.
JP24246983A 1983-12-21 1983-12-21 Electrophotographic copying machine Pending JPS60133474A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24246983A JPS60133474A (en) 1983-12-21 1983-12-21 Electrophotographic copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24246983A JPS60133474A (en) 1983-12-21 1983-12-21 Electrophotographic copying machine

Publications (1)

Publication Number Publication Date
JPS60133474A true JPS60133474A (en) 1985-07-16

Family

ID=17089541

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24246983A Pending JPS60133474A (en) 1983-12-21 1983-12-21 Electrophotographic copying machine

Country Status (1)

Country Link
JP (1) JPS60133474A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62180381A (en) * 1986-02-04 1987-08-07 Minolta Camera Co Ltd Image recording device
JPH01121881A (en) * 1987-11-06 1989-05-15 Ricoh Co Ltd Image forming device
US7817927B2 (en) 2006-08-29 2010-10-19 Brother Kogyo Kabushiki Kaisha Image forming apparatus with developer collection

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62180381A (en) * 1986-02-04 1987-08-07 Minolta Camera Co Ltd Image recording device
JPH01121881A (en) * 1987-11-06 1989-05-15 Ricoh Co Ltd Image forming device
US7817927B2 (en) 2006-08-29 2010-10-19 Brother Kogyo Kabushiki Kaisha Image forming apparatus with developer collection

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