JPS57141666A - Developing device - Google Patents

Developing device

Info

Publication number
JPS57141666A
JPS57141666A JP19933481A JP19933481A JPS57141666A JP S57141666 A JPS57141666 A JP S57141666A JP 19933481 A JP19933481 A JP 19933481A JP 19933481 A JP19933481 A JP 19933481A JP S57141666 A JPS57141666 A JP S57141666A
Authority
JP
Japan
Prior art keywords
developer
magnetic field
concn
atr
magnet
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
JP19933481A
Other languages
Japanese (ja)
Inventor
Yoshio Ito
Katsuhiko Yamada
Tadayuki Kitajima
Koichi Miyamoto
Hiroo Kobayashi
Yoshikuni Toyama
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 JP19933481A priority Critical patent/JPS57141666A/en
Publication of JPS57141666A publication Critical patent/JPS57141666A/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
    • G03G15/0851—Detection or control means for the developer concentration the concentration being measured by electrical means

Abstract

PURPOSE:To prevent the operation errors of an automatic concn. regulator ATR by protecting an ATR detecting element which detects the change of electrostatic capacity, etc., in the surroundings against the disturbing magnetic field from a magnet disposed in a sleeve by means of magnetic material shields. CONSTITUTION:Level detection is accomplished by detecting the capacity of the developer. When the developer contg. iron power as a carrier and a toner decreases to a position lower than the height of an ATR element 23, the element 23 detects the change in the electrostatic capacity or magnetic field near the element and replenishes the toner to the developer through a hopper. In this case, important is that a magnet 3 exists near the element 23. Therefore, the magnetic field that give disturbance must be shut off. Shield plates 6-7 are the magnetic shield walls constituted of a magnetic material, and the disturbing magnetic field from the magnet 3 is shielded against the element 23 by means of these shield plates. Thereby, the operation errors of the automatic concn. regulator is prevented and the concn. regulation of the developer is accomplished well.
JP19933481A 1981-12-10 1981-12-10 Developing device Pending JPS57141666A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19933481A JPS57141666A (en) 1981-12-10 1981-12-10 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19933481A JPS57141666A (en) 1981-12-10 1981-12-10 Developing device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP50009057A Division JPS5937831B2 (en) 1975-01-21 1975-01-21 Electrophotographic developing device

Publications (1)

Publication Number Publication Date
JPS57141666A true JPS57141666A (en) 1982-09-02

Family

ID=16406060

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19933481A Pending JPS57141666A (en) 1981-12-10 1981-12-10 Developing device

Country Status (1)

Country Link
JP (1) JPS57141666A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6415260U (en) * 1987-07-17 1989-01-25
US8049378B2 (en) 2007-01-15 2011-11-01 Hitachi, Ltd. Forced cooling rotary electric machine
CN112526854A (en) * 2019-09-18 2021-03-19 京瓷办公信息系统株式会社 Image forming apparatus with a toner supply device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4981040A (en) * 1972-12-07 1974-08-05
JPS5184260A (en) * 1975-01-21 1976-07-23 Canon Kk
JPS52110048A (en) * 1976-03-12 1977-09-14 Hitachi Ltd Toner controller

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4981040A (en) * 1972-12-07 1974-08-05
JPS5184260A (en) * 1975-01-21 1976-07-23 Canon Kk
JPS52110048A (en) * 1976-03-12 1977-09-14 Hitachi Ltd Toner controller

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6415260U (en) * 1987-07-17 1989-01-25
US8049378B2 (en) 2007-01-15 2011-11-01 Hitachi, Ltd. Forced cooling rotary electric machine
CN112526854A (en) * 2019-09-18 2021-03-19 京瓷办公信息系统株式会社 Image forming apparatus with a toner supply device
CN112526854B (en) * 2019-09-18 2023-08-29 京瓷办公信息系统株式会社 Image forming apparatus having a plurality of image forming units

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