JPS56138759A - Developing device - Google Patents

Developing device

Info

Publication number
JPS56138759A
JPS56138759A JP4222280A JP4222280A JPS56138759A JP S56138759 A JPS56138759 A JP S56138759A JP 4222280 A JP4222280 A JP 4222280A JP 4222280 A JP4222280 A JP 4222280A JP S56138759 A JPS56138759 A JP S56138759A
Authority
JP
Japan
Prior art keywords
toner
cylinder surface
cylinder
magnetic
nonmagnetic
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
JP4222280A
Other languages
Japanese (ja)
Other versions
JPS6332189B2 (en
Inventor
Hatsuo Tajima
Nagao Hosono
Junichiro Kanbe
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 JP4222280A priority Critical patent/JPS56138759A/en
Publication of JPS56138759A publication Critical patent/JPS56138759A/en
Publication of JPS6332189B2 publication Critical patent/JPS6332189B2/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
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/06—Developing
    • G03G13/08—Developing using a solid developer, e.g. powder developer
    • G03G13/09—Developing using a solid developer, e.g. powder developer using magnetic brush

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

PURPOSE:To obtain stable image quality by keeping the average sizes of the magnetic toner contg. 15-50wt% magnetic powder at 5-30mu, and providing magnetic poles applying the magnetic field of average >=1350 gauss between a toner thickness regulating member and a toner carrying body. CONSTITUTION:A multipolar permanent magnet 9 is held fixed, and a nonmagnetic cylinder 8 which is a toner supporting body is rotated in the same direction on the plane proximate to an electrostatic image holding surface 1. As the cylinder 8 revolves, the one-component insulation-characteristic ferromagnetic toner 12 which is being fed from a toner vessel 14 is coated on the nonmagnetic cylinder surface. At this time, the trichoelectric series of both are so selected that the load of the polarity reverse from that of the electrostatic image charge is applied upon the toner particles by the friction between the cylinder surface and the toner particles. Further, an iron-made doctor blade 10a is disposed in proximity to the cylinder surface. The blade 10 regulates the thickness of the toner layer thinly and uniformly with a sheet of which the longitudinal direction is the generator direction of the nonmagnetic cylinder surface.
JP4222280A 1980-03-31 1980-03-31 Developing device Granted JPS56138759A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4222280A JPS56138759A (en) 1980-03-31 1980-03-31 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4222280A JPS56138759A (en) 1980-03-31 1980-03-31 Developing device

Publications (2)

Publication Number Publication Date
JPS56138759A true JPS56138759A (en) 1981-10-29
JPS6332189B2 JPS6332189B2 (en) 1988-06-28

Family

ID=12630003

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4222280A Granted JPS56138759A (en) 1980-03-31 1980-03-31 Developing device

Country Status (1)

Country Link
JP (1) JPS56138759A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62145269A (en) * 1985-12-19 1987-06-29 Canon Inc Developing device
US4987452A (en) * 1987-12-29 1991-01-22 Minolta Camera Kabushiki Kaisha Developing apparatus provided with a chamber for controlling toner grain diameter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62145269A (en) * 1985-12-19 1987-06-29 Canon Inc Developing device
US4987452A (en) * 1987-12-29 1991-01-22 Minolta Camera Kabushiki Kaisha Developing apparatus provided with a chamber for controlling toner grain diameter

Also Published As

Publication number Publication date
JPS6332189B2 (en) 1988-06-28

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