JPS57190973A - Controller of toner concentration - Google Patents

Controller of toner concentration

Info

Publication number
JPS57190973A
JPS57190973A JP7498881A JP7498881A JPS57190973A JP S57190973 A JPS57190973 A JP S57190973A JP 7498881 A JP7498881 A JP 7498881A JP 7498881 A JP7498881 A JP 7498881A JP S57190973 A JPS57190973 A JP S57190973A
Authority
JP
Japan
Prior art keywords
concentration
toner
signal
supply
deltac
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
JP7498881A
Other languages
Japanese (ja)
Inventor
Yoshinori Ikeda
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 JP7498881A priority Critical patent/JPS57190973A/en
Priority to US06/378,008 priority patent/US4462680A/en
Publication of JPS57190973A publication Critical patent/JPS57190973A/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)
  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To ensure the optimum supply of toner regardless of the type of the original, the number of continuously copied sheets, etc., by multiplying the difference value between the standard concentration and the detected concentration by its corresponding coefficient, then supplying the toner according to the value obtained from the above multiplication. CONSTITUTION:The signal corresponding to a standard concentration plate or the concentration of the developer detected at a toner concentration detecting part 9 is amplified by an amplifier 10 containing an arithmetic amplifier 10a and fed to an A/D converter 11 after receiving a level adjustment at a volume VR1. This signal is sampled with the prescribed timing and by the sampling signal emerging on a signal line C. The sampled signal is fetched into a CPU13 after an A/D conversion and receives an arithmetic process based on a program within an ROM15. Thus the supply time of the toner is decided. The amount of supply RT is decided as RT=KXDELTAC (DELTAC: difference of concentration), where K is 0.8, 1, 1.2, 1.4 and 1.6 when DELTAC is <=1%, 1-2%, 2-3%, 3-4% and >=4% respectively.
JP7498881A 1981-05-20 1981-05-20 Controller of toner concentration Pending JPS57190973A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP7498881A JPS57190973A (en) 1981-05-20 1981-05-20 Controller of toner concentration
US06/378,008 US4462680A (en) 1981-05-20 1982-05-13 Apparatus for controlling toner density

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7498881A JPS57190973A (en) 1981-05-20 1981-05-20 Controller of toner concentration

Publications (1)

Publication Number Publication Date
JPS57190973A true JPS57190973A (en) 1982-11-24

Family

ID=13563161

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7498881A Pending JPS57190973A (en) 1981-05-20 1981-05-20 Controller of toner concentration

Country Status (1)

Country Link
JP (1) JPS57190973A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6243674A (en) * 1985-08-20 1987-02-25 Sanyo Electric Co Ltd Electronic copying machine
JPS63177173A (en) * 1987-01-19 1988-07-21 Canon Inc Developing device
US4883019A (en) * 1987-01-19 1989-11-28 Canon Kabushiki Kaisha Image forming apparatus having developer content detector
US5523832A (en) * 1992-05-29 1996-06-04 Minolta Camera Kabushiki Kaisha Electrophotographic image forming apparatus with controlled mixing of developer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6243674A (en) * 1985-08-20 1987-02-25 Sanyo Electric Co Ltd Electronic copying machine
JPS63177173A (en) * 1987-01-19 1988-07-21 Canon Inc Developing device
US4883019A (en) * 1987-01-19 1989-11-28 Canon Kabushiki Kaisha Image forming apparatus having developer content detector
US5523832A (en) * 1992-05-29 1996-06-04 Minolta Camera Kabushiki Kaisha Electrophotographic image forming apparatus with controlled mixing of developer

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