JPS5776572A - Dry type developing device - Google Patents

Dry type developing device

Info

Publication number
JPS5776572A
JPS5776572A JP15303580A JP15303580A JPS5776572A JP S5776572 A JPS5776572 A JP S5776572A JP 15303580 A JP15303580 A JP 15303580A JP 15303580 A JP15303580 A JP 15303580A JP S5776572 A JPS5776572 A JP S5776572A
Authority
JP
Japan
Prior art keywords
magnetic
substance
detecting part
toner concentration
shielding member
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
JP15303580A
Other languages
Japanese (ja)
Other versions
JPS6257993B2 (en
Inventor
Atsushi Arai
Masao Masumura
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 JP15303580A priority Critical patent/JPS5776572A/en
Publication of JPS5776572A publication Critical patent/JPS5776572A/en
Publication of JPS6257993B2 publication Critical patent/JPS6257993B2/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)
  • Dry Development In Electrophotography (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)

Abstract

PURPOSE:To shield a toner concentration detecting part from a magnetic field, by providing a magnetic shielding member which has combined >=2 platelike magnetic substances through a nonmagnetic substance, between a magnetic roll and the toner concentration detecting part. CONSTITUTION:A magnetic shielding member 5 formed by combining a platelike magnetic substance 51 and 53 through a nonmagnetic substance 52 is placed between a magnetic roll and a toner concentration detecting part. When a sleeve 10 is turned clockwise, a developer scraped by a doctor 2 flows down through on a guide plate 3, and its concentration is detected by a sensor 4. According to this constitution, since the shielding member 5 is provided, lines of magnetic force of magnets 11, 12 are led into the magnetic substance 51, the line of magnetic force of the magnetic substance 51 is led into the magnetic substance 53, and the line of magnetic force of the magnetic substance 53 enters the sensor partially, but it is weakened enough. In this way, the magnetic field does not operate on the detecting part substantially, and the toner concentration is detected exactly.
JP15303580A 1980-10-31 1980-10-31 Dry type developing device Granted JPS5776572A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15303580A JPS5776572A (en) 1980-10-31 1980-10-31 Dry type developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15303580A JPS5776572A (en) 1980-10-31 1980-10-31 Dry type developing device

Publications (2)

Publication Number Publication Date
JPS5776572A true JPS5776572A (en) 1982-05-13
JPS6257993B2 JPS6257993B2 (en) 1987-12-03

Family

ID=15553540

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15303580A Granted JPS5776572A (en) 1980-10-31 1980-10-31 Dry type developing device

Country Status (1)

Country Link
JP (1) JPS5776572A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6415260U (en) * 1987-07-17 1989-01-25

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6415260U (en) * 1987-07-17 1989-01-25

Also Published As

Publication number Publication date
JPS6257993B2 (en) 1987-12-03

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