JPS56151946A - Electrophotographic copier - Google Patents

Electrophotographic copier

Info

Publication number
JPS56151946A
JPS56151946A JP5603780A JP5603780A JPS56151946A JP S56151946 A JPS56151946 A JP S56151946A JP 5603780 A JP5603780 A JP 5603780A JP 5603780 A JP5603780 A JP 5603780A JP S56151946 A JPS56151946 A JP S56151946A
Authority
JP
Japan
Prior art keywords
toner
width
concn
control
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
JP5603780A
Other languages
Japanese (ja)
Inventor
Hiroshi Okamoto
Tetsuya Yamada
Fumitoshi Atsumi
Takashi Tottori
Yoshihiro Hanada
Yutaka Irie
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP5603780A priority Critical patent/JPS56151946A/en
Publication of JPS56151946A publication Critical patent/JPS56151946A/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
    • G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means

Landscapes

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

Abstract

PURPOSE:To maintain the toner concn. in the developer accurately within a permissible width at all times by setting the width of the control image of a black color installed before or behind an original imposing surface in the direction orthogonal to the moving direction of a photoreceptor. CONSTITUTION:The toner concn. is satisfactory if the toner pickup amount for the control latent image at the maximum quantity of image exposure light when said concn. is a lower limit Tmin. of a permissible width is below the toner pickup amount at the minimum quantity of image exposure light when said concn. is an upper limit Tmax. of the permissible width. The toner pickup amount fluctuates in accordance with the value of the potential difference VG between a control latent image potential VS and an effective developing bias potential VBE, that is, a control image width (l). Then, if the control image width (l) is determined from the equation II by the constant A satisfying the equation I, the toner concn. is maintained within the permissible width despite simultaneous employment of a control latent image replenishing system and a self-bias combination use system making combination use of an exposure control system. With such constitution, the toner concn. in the developer is maintained accurately within the permissible range at all times.
JP5603780A 1980-04-25 1980-04-25 Electrophotographic copier Pending JPS56151946A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5603780A JPS56151946A (en) 1980-04-25 1980-04-25 Electrophotographic copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5603780A JPS56151946A (en) 1980-04-25 1980-04-25 Electrophotographic copier

Publications (1)

Publication Number Publication Date
JPS56151946A true JPS56151946A (en) 1981-11-25

Family

ID=13015874

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5603780A Pending JPS56151946A (en) 1980-04-25 1980-04-25 Electrophotographic copier

Country Status (1)

Country Link
JP (1) JPS56151946A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56164354A (en) * 1980-05-22 1981-12-17 Fuji Xerox Co Ltd Image density detector of electrophotographic copying machine
JPS6021038A (en) * 1983-07-15 1985-02-02 Minolta Camera Co Ltd Control device of picture density in copying machine
JPS60131576A (en) * 1983-12-20 1985-07-13 Konishiroku Photo Ind Co Ltd Image adjusting method
JPS60162267A (en) * 1984-02-02 1985-08-24 Konishiroku Photo Ind Co Ltd Electrostatic recording device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56164354A (en) * 1980-05-22 1981-12-17 Fuji Xerox Co Ltd Image density detector of electrophotographic copying machine
JPS6021038A (en) * 1983-07-15 1985-02-02 Minolta Camera Co Ltd Control device of picture density in copying machine
US4572653A (en) * 1983-07-15 1986-02-25 Minolta Camera Kabushiki Kaisha Image density control apparatus for copying machines
JPS60131576A (en) * 1983-12-20 1985-07-13 Konishiroku Photo Ind Co Ltd Image adjusting method
JPS60162267A (en) * 1984-02-02 1985-08-24 Konishiroku Photo Ind Co Ltd Electrostatic recording device
JPH0437989B2 (en) * 1984-02-02 1992-06-23 Konishiroku Photo Ind

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