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JPS57116370A - Toner-density detecting circuit of electronic copying machine - Google Patents

Toner-density detecting circuit of electronic copying machine

Info

Publication number
JPS57116370A
JPS57116370A JP341881A JP341881A JPS57116370A JP S57116370 A JPS57116370 A JP S57116370A JP 341881 A JP341881 A JP 341881A JP 341881 A JP341881 A JP 341881A JP S57116370 A JPS57116370 A JP S57116370A
Authority
JP
Japan
Prior art keywords
humidity
circuit
toner
detecting circuit
discriminating
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
JP341881A
Other languages
Japanese (ja)
Inventor
Masaaki Doi
Hisao Shibata
Masayoshi Hayashi
Osamu Riyuukou
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 Finetech Nisca Inc
Original Assignee
Copyer 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 Copyer Co Ltd filed Critical Copyer Co Ltd
Priority to JP341881A priority Critical patent/JPS57116370A/en
Publication of JPS57116370A publication Critical patent/JPS57116370A/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
    • G03G15/0853—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
    • G03G15/06—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
    • G03G15/0887—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To prevent the precision of toner density detection from lowering, by providing an inductance type toner-density detecting circuit with a humidity detecting circuit and by varying the reference value of a discriminating circuit in accordance with humidity. CONSTITUTION:A detection signal from an inductance type toner-density detecting circuit 2 is supplied to a discriminating circut 18. On the other hand, a detection signal from a humidity circuit 30 which detects ambient relative humidity is supplied to a control circuit 50. When the humidity is below a prescribed value, e.g., 30%, the control circuit 50 increases the reference discrimination value Vr of the discriminating circuit 18 by a prescribed value. When the humidity is above a prescribed value, e.g., 80%, the reference value Vr of the discriminating circuit 18 is decreased by a prescribed value. Thus, an increase or decrease in the detection output of the density detecting circuit 2 at low or high humidity is compensated. For this purpose, the reference value of the discriminating circuit is varied in accordance with the humidity to prevent the precision of toner density detection from lowering.
JP341881A 1981-01-13 1981-01-13 Toner-density detecting circuit of electronic copying machine Pending JPS57116370A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP341881A JPS57116370A (en) 1981-01-13 1981-01-13 Toner-density detecting circuit of electronic copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP341881A JPS57116370A (en) 1981-01-13 1981-01-13 Toner-density detecting circuit of electronic copying machine

Publications (1)

Publication Number Publication Date
JPS57116370A true JPS57116370A (en) 1982-07-20

Family

ID=11556828

Family Applications (1)

Application Number Title Priority Date Filing Date
JP341881A Pending JPS57116370A (en) 1981-01-13 1981-01-13 Toner-density detecting circuit of electronic copying machine

Country Status (1)

Country Link
JP (1) JPS57116370A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5237369A (en) * 1990-08-10 1993-08-17 Ricoh Company, Ltd. Color image forming equipment responsive to changes in ambient conditions
US5311256A (en) * 1990-06-04 1994-05-10 Minolta Camera Kabushiki Kaisha Image forming apparatus maintaining image density stability against humidity
US5579091A (en) * 1994-03-04 1996-11-26 Hitachi Koki Co., Ltd. Developing unit for electro-photographic apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5311256A (en) * 1990-06-04 1994-05-10 Minolta Camera Kabushiki Kaisha Image forming apparatus maintaining image density stability against humidity
US5237369A (en) * 1990-08-10 1993-08-17 Ricoh Company, Ltd. Color image forming equipment responsive to changes in ambient conditions
US5579091A (en) * 1994-03-04 1996-11-26 Hitachi Koki Co., Ltd. Developing unit for electro-photographic apparatus

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