JPS56101166A - Toner concentration control device - Google Patents

Toner concentration control device

Info

Publication number
JPS56101166A
JPS56101166A JP412380A JP412380A JPS56101166A JP S56101166 A JPS56101166 A JP S56101166A JP 412380 A JP412380 A JP 412380A JP 412380 A JP412380 A JP 412380A JP S56101166 A JPS56101166 A JP S56101166A
Authority
JP
Japan
Prior art keywords
output
toner
coil
concn
control device
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
JP412380A
Other languages
Japanese (ja)
Inventor
Yasushi Furuichi
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP412380A priority Critical patent/JPS56101166A/en
Publication of JPS56101166A publication Critical patent/JPS56101166A/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

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 maintain toner concn. correctly by applying temp. correction according to the temperatures of the developer to the control system of a toner concn. control device which controls the concn. of the toner from the change in the inductance of a coil. CONSTITUTION:The reference frequency fo to be applied to the coil of a sensor 1, and the detection frequency fr when the developer is acted in said coil are mixed and the output fo-fr thereof is detected with a detector 3. Thence, the detected output is amplified with an amplifier 4, and the amplified output V (voltage value corresponding to fo-fr) thereof and the output Vo of a temp. compensating circuit 5 are compared in a comparator 6, the compared output whereof is sent as a driving command to the driving motor 8 of an automatic toner replenishing device via an amplifier 7.
JP412380A 1980-01-18 1980-01-18 Toner concentration control device Pending JPS56101166A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP412380A JPS56101166A (en) 1980-01-18 1980-01-18 Toner concentration control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP412380A JPS56101166A (en) 1980-01-18 1980-01-18 Toner concentration control device

Publications (1)

Publication Number Publication Date
JPS56101166A true JPS56101166A (en) 1981-08-13

Family

ID=11576001

Family Applications (1)

Application Number Title Priority Date Filing Date
JP412380A Pending JPS56101166A (en) 1980-01-18 1980-01-18 Toner concentration control device

Country Status (1)

Country Link
JP (1) JPS56101166A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01129274A (en) * 1987-11-13 1989-05-22 Mita Ind Co Ltd Toner concentration controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01129274A (en) * 1987-11-13 1989-05-22 Mita Ind Co Ltd Toner concentration controller

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