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Title:
ELECTROSTATIC LATENT IMAGE DEVELOPING CARRIER, DEVELOPER, DEVELOPER CONTAINER, IMAGE FORMING METHOD, AND PROCESSING CARTRIDGE
Document Type and Number:
Japanese Patent JP2005181944
Kind Code:
A
Abstract:

To provide a carrier which can form superior images and has an appropriate resistance and stabilized static charges, but will not stick to the photosensitive material, a developer, a developer container, and to provide an image forming method and a process cartridge.

In this electrostatic latent image developing carrier consists of a core material and a cover layer, the core material is a ferrite particle and contains 0.01-5 mass % of Zr and/or 0.005-1 mass % of Bi. The carrier has a breakdown voltage of 1,000 V or higher, when measured by applying a dc volt in a measuring instrument, having a gap of 1 mm between an electrode facing a rotating sleeve which has a fixed built-in magnet, and has a magnetic moment of 65-90 emu/g at 1kOe. Further, it keeps a distance of 2 mm±0.3 mm between the electrodes, when a dc voltage is applied to a particle chain in a magnetic field of 1,500 Gauss and has a breakdown voltage of 500 V or higher, when measured with a bridge measurement instrument.


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Inventors:
SUZUKI KOSUKE
KONDO FUMIO
YAMASHITA MASAHIDE
Application Number:
JP2003434900A
Publication Date:
July 07, 2005
Filing Date:
December 26, 2003
Export Citation:
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Assignee:
RICOH KK
International Classes:
G03G9/107; G03G9/113; G03G13/06; G03G9/08; (IPC1-7): G03G9/107; G03G9/08; G03G9/113
Domestic Patent References:
JPH09288408A1997-11-04
JPS61200551A1986-09-05
JPS58123550A1983-07-22
JPS58123552A1983-07-22
JP2000330342A2000-11-30
JP2002328494A2002-11-15
JP2003098828A2003-04-04
JP2001272858A2001-10-05
JP2003215929A2003-07-30
JP2002287432A2002-10-03
JPH086302A1996-01-12
JP2000010337A2000-01-14
JP2003021935A2003-01-24
JP2003307936A2003-10-31
JP2004240322A2004-08-26
JP2005504345A2005-02-10
JP2003533743A2003-11-11
JP2003533744A2003-11-11
JPH096052A1997-01-10
JPH0822150A1996-01-23
JPH11202559A1999-07-30
JPH086304A1996-01-12
JPH0483279A1992-03-17
JPH09269613A1997-10-14
JPH05216282A1993-08-27
Foreign References:
WO2003027771A12003-04-03
US6232026B12001-05-15
US6228549B12001-05-08
Attorney, Agent or Firm:
Kazuhiko Kato
Yasushi Suzuki
Michitaka Sasaki



 
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