JPS57136667A - Developer density controller - Google Patents

Developer density controller

Info

Publication number
JPS57136667A
JPS57136667A JP56021345A JP2134581A JPS57136667A JP S57136667 A JPS57136667 A JP S57136667A JP 56021345 A JP56021345 A JP 56021345A JP 2134581 A JP2134581 A JP 2134581A JP S57136667 A JPS57136667 A JP S57136667A
Authority
JP
Japan
Prior art keywords
density
developer
cpu61
detecting
toner density
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
JP56021345A
Other languages
Japanese (ja)
Inventor
Akio Suzuki
Kazuhiro Hirayama
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 JP56021345A priority Critical patent/JPS57136667A/en
Priority to US06/347,789 priority patent/US4468112A/en
Priority to DE19823205531 priority patent/DE3205531A1/en
Publication of JPS57136667A publication Critical patent/JPS57136667A/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
    • G03G15/0853—Detection or control means for the developer concentration the concentration being measured by magnetic means
    • 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
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
    • G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To stabilize development effect and to hold it adequately for a long period by detecting the toner density of a developer and by exercising variable control over a level for detecting said toner density according to the density of a reference image formed on a photoreceptor. CONSTITUTION:The toner density of a developer 45 in a developing device 43 is detected by a magnetic permeability sensor 63, whose detection signal is inputted from a developer density detection part 67 to a CPU61. On the other hand, a control signal from the CPU61 causes a laser beam 17 from an A/O modulator 16 to illuminate a photosensitive drum 31, and the image density Dp of a developed reference image obtained by developing a reference latent image by the developer is detected by a reflection density detection part 143, whose detection signal is inputted to the CPU61. Then, the A/O modulator 16 is controlled to read background density Do on a photoreceptor surface 33 after the development, and on the basis of those density levels Dp and Do, a detection level for detecting the toner density is varied.
JP56021345A 1981-02-18 1981-02-18 Developer density controller Pending JPS57136667A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP56021345A JPS57136667A (en) 1981-02-18 1981-02-18 Developer density controller
US06/347,789 US4468112A (en) 1981-02-18 1982-02-11 Developer concentration controlling device
DE19823205531 DE3205531A1 (en) 1981-02-18 1982-02-17 DEVELOPER CONCENTRATION CONTROL DEVICE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56021345A JPS57136667A (en) 1981-02-18 1981-02-18 Developer density controller

Publications (1)

Publication Number Publication Date
JPS57136667A true JPS57136667A (en) 1982-08-23

Family

ID=12052499

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56021345A Pending JPS57136667A (en) 1981-02-18 1981-02-18 Developer density controller

Country Status (1)

Country Link
JP (1) JPS57136667A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6374655U (en) * 1986-11-05 1988-05-18
JPH02129674A (en) * 1988-11-09 1990-05-17 Ricoh Co Ltd Controller for toner concentration in developing electrostatic latent image
JPH02176678A (en) * 1988-09-09 1990-07-09 Ricoh Co Ltd Picture density control method
JPH0594857U (en) * 1993-04-27 1993-12-24 日立金属株式会社 Toner concentration detector for developer
EP1785777A1 (en) * 2005-11-11 2007-05-16 Ricoh Company, Ltd. Correction of toner concentration control using averaged image coverage data
JP2007171928A (en) * 2005-11-25 2007-07-05 Ricoh Co Ltd Image forming apparatus and method for controlling image density of same
JP2009035870A (en) * 2007-07-31 2009-02-19 Suzuho:Kk Door opening device
US7515844B2 (en) 2005-11-30 2009-04-07 Ricoh Company, Ltd. Image density control method and image forming apparatus
US7668471B2 (en) 2006-05-22 2010-02-23 Ricoh Company Limited Image forming apparatus and image forming method
US7747182B2 (en) 2005-11-11 2010-06-29 Ricoh Company, Ltd. Image forming apparatus with toner density control
US7881629B2 (en) 2006-11-10 2011-02-01 Ricoh Company, Ltd. Image forming apparatus and image density control method
US7929873B2 (en) 2007-02-26 2011-04-19 Ricoh Company Limited Image forming apparatus and image density control method
US8027605B2 (en) 2007-10-24 2011-09-27 Ricoh Company, Ltd. Image forming apparatus and image density control method
US8175471B2 (en) 2006-12-15 2012-05-08 Ricoh Company, Ltd. Image forming apparatus and image density control method

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6374655U (en) * 1986-11-05 1988-05-18
JPH02176678A (en) * 1988-09-09 1990-07-09 Ricoh Co Ltd Picture density control method
JPH02129674A (en) * 1988-11-09 1990-05-17 Ricoh Co Ltd Controller for toner concentration in developing electrostatic latent image
JPH0594857U (en) * 1993-04-27 1993-12-24 日立金属株式会社 Toner concentration detector for developer
EP1785777A1 (en) * 2005-11-11 2007-05-16 Ricoh Company, Ltd. Correction of toner concentration control using averaged image coverage data
US7809291B2 (en) 2005-11-11 2010-10-05 Ricoh Company, Ltd. Image forming apparatus with a two component developer, toner density detection and toner density correction
US7747182B2 (en) 2005-11-11 2010-06-29 Ricoh Company, Ltd. Image forming apparatus with toner density control
US7536121B2 (en) 2005-11-25 2009-05-19 Ricoh Company, Limited Image forming apparatus and image density control method
JP2007171928A (en) * 2005-11-25 2007-07-05 Ricoh Co Ltd Image forming apparatus and method for controlling image density of same
US7515844B2 (en) 2005-11-30 2009-04-07 Ricoh Company, Ltd. Image density control method and image forming apparatus
US7668471B2 (en) 2006-05-22 2010-02-23 Ricoh Company Limited Image forming apparatus and image forming method
US7881629B2 (en) 2006-11-10 2011-02-01 Ricoh Company, Ltd. Image forming apparatus and image density control method
US8175471B2 (en) 2006-12-15 2012-05-08 Ricoh Company, Ltd. Image forming apparatus and image density control method
US7929873B2 (en) 2007-02-26 2011-04-19 Ricoh Company Limited Image forming apparatus and image density control method
JP2009035870A (en) * 2007-07-31 2009-02-19 Suzuho:Kk Door opening device
US8027605B2 (en) 2007-10-24 2011-09-27 Ricoh Company, Ltd. Image forming apparatus and image density control method

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