JPS56143469A - Adjusting device for developer concentration - Google Patents

Adjusting device for developer concentration

Info

Publication number
JPS56143469A
JPS56143469A JP4739580A JP4739580A JPS56143469A JP S56143469 A JPS56143469 A JP S56143469A JP 4739580 A JP4739580 A JP 4739580A JP 4739580 A JP4739580 A JP 4739580A JP S56143469 A JPS56143469 A JP S56143469A
Authority
JP
Japan
Prior art keywords
concn
developer
exposure
light source
image
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
JP4739580A
Other languages
Japanese (ja)
Inventor
Matsuomi Nishimura
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 JP4739580A priority Critical patent/JPS56143469A/en
Publication of JPS56143469A publication Critical patent/JPS56143469A/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
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
    • G03G15/0849—Detection or control means for the developer concentration
    • 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
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
    • G03G15/0849—Detection or control means for the developer concentration
    • G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means

Abstract

PURPOSE:To restore the developer concn. automatically to a proper concn. by providing an exposure means which exposes the surface of an image carrying body at the nonimage exposure, a developer concn. detecting means and a control means controlling the exposure means according to the developer concn. CONSTITUTION:A light source 12 is so designed that the same potential as the latent image potensial obtainable on a photosensitive drum by exposure of the white ground part of an original is formed. It is put out at the light image exposure and is lighted in the operation period of still the primary, secondary and other corona dischargers although the image forming step has ended. In order to adjust the developer concn. by utilizing the light source 12, a developer concn. detecting means 13 and the control means 14 for the light source 12 are provided. In this way, the effect of permitting the automatic restoration of the developer concn. having increased too much to a proper concn. is obtained with the simple constitution.
JP4739580A 1980-04-10 1980-04-10 Adjusting device for developer concentration Pending JPS56143469A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4739580A JPS56143469A (en) 1980-04-10 1980-04-10 Adjusting device for developer concentration

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4739580A JPS56143469A (en) 1980-04-10 1980-04-10 Adjusting device for developer concentration

Publications (1)

Publication Number Publication Date
JPS56143469A true JPS56143469A (en) 1981-11-09

Family

ID=12773917

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4739580A Pending JPS56143469A (en) 1980-04-10 1980-04-10 Adjusting device for developer concentration

Country Status (1)

Country Link
JP (1) JPS56143469A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6385661A (en) * 1986-09-30 1988-04-16 Toshiba Corp Developer concentration adjusting device for image forming device
EP0436287A2 (en) * 1989-11-15 1991-07-10 Delphax Systems Printer autocontrast control

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6385661A (en) * 1986-09-30 1988-04-16 Toshiba Corp Developer concentration adjusting device for image forming device
EP0436287A2 (en) * 1989-11-15 1991-07-10 Delphax Systems Printer autocontrast control

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