Carrier, developer, method, and apparatus for forming electrophotographic image, and process cartridge

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11106150
APP PUB NO 20200166867A1
SERIAL NO

16683534

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Abstract

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A carrier for forming an electrophotographic image is provided. The carrier includes a core particle comprising a manganese-based ferrite particle having an apparent density of from 2.0 to 2.2 g/cm3 and a magnetization of from 44 to 52 emu/g in a magnetic field of 500 Oe; and a coating layer coating a surface of the core particle. The coating layer contains a carbon black, an inorganic particle A, and an inorganic particle B. The inorganic particle A and the carbon black each have a concentration gradient in a thickness direction of the coating layer. A concentration of the inorganic particle A increases toward a surface of the coating layer, and a concentration of the carbon black decreases toward the surface of the coating layer.

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Patent Owner(s)

  • RICOH COMPANY, LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ishikawa, Yoshimichi Hyogo, JP 56 1010
Kishida, Hiroyuki Shizuoka, JP 55 528
Nagayama, Masashi Shizuoka, JP 61 716
Seki, Masahiro Nara, JP 35 234
Yamada, Saori Shizuoka, JP 39 460

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