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JPS5667872A - Toner concentration detector - Google Patents

Toner concentration detector

Info

Publication number
JPS5667872A
JPS5667872A JP14446779A JP14446779A JPS5667872A JP S5667872 A JPS5667872 A JP S5667872A JP 14446779 A JP14446779 A JP 14446779A JP 14446779 A JP14446779 A JP 14446779A JP S5667872 A JPS5667872 A JP S5667872A
Authority
JP
Japan
Prior art keywords
detecting
toner concn
resonance circuit
capacitor
coil
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.)
Granted
Application number
JP14446779A
Other languages
Japanese (ja)
Other versions
JPS6328305B2 (en
Inventor
Masayasu Anzai
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.)
Koki Holdings Co Ltd
Hitachi Ltd
Original Assignee
Hitachi Ltd
Hitachi Koki 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 Hitachi Ltd, Hitachi Koki Co Ltd filed Critical Hitachi Ltd
Priority to JP14446779A priority Critical patent/JPS5667872A/en
Publication of JPS5667872A publication Critical patent/JPS5667872A/en
Publication of JPS6328305B2 publication Critical patent/JPS6328305B2/ja
Granted 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To eliminate the false detection of toner concn. by checking the excessively high point of toner concn. with the simple constitution of forming a resonance circuit by means of a coil and a capacitor and detecting the toner concn. in the inductive region thereof. CONSTITUTION:This is a device of detecting toner concn. based on the change in the magnetic permeability of the developer, wherein a resonance circuit is formed by connecting a detecting coil 9 detecting the magnetic permeability as an inductance of the coil and a resonance capacitor 8 in series or parallel. The output voltage V of the resonance circuit is compared with a reference voltage Vc, whereby whether the toner concn. is higher or lower than the standard value is discriminated. In this case, the value of the capacitor 8 is so set that when the developer is of a standard toner concn. the resonance circuit becomes inductive, whereby false detection is prevented.
JP14446779A 1979-11-09 1979-11-09 Toner concentration detector Granted JPS5667872A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14446779A JPS5667872A (en) 1979-11-09 1979-11-09 Toner concentration detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14446779A JPS5667872A (en) 1979-11-09 1979-11-09 Toner concentration detector

Publications (2)

Publication Number Publication Date
JPS5667872A true JPS5667872A (en) 1981-06-08
JPS6328305B2 JPS6328305B2 (en) 1988-06-08

Family

ID=15362950

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14446779A Granted JPS5667872A (en) 1979-11-09 1979-11-09 Toner concentration detector

Country Status (1)

Country Link
JP (1) JPS5667872A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19722488B4 (en) * 1996-05-29 2017-02-09 Ricoh Co., Ltd. Imaging device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19722488B4 (en) * 1996-05-29 2017-02-09 Ricoh Co., Ltd. Imaging device

Also Published As

Publication number Publication date
JPS6328305B2 (en) 1988-06-08

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