Electrophotography – Image formation – Development
Patent
1998-02-13
1999-07-13
Lee, S.
Electrophotography
Image formation
Development
399270, G03G 1509
Patent
active
059239336
ABSTRACT:
A uniform image is obtained by matching the sliding friction force, the moving speed and the developing agent in a developing region of two developing rollers and an electric characteristic of a photosensitive body used for image development. Two developing rollers rotating in directions opposite to each other are used, the moving direction of the first developing roller being opposite to the moving direction of the photosensitive body, and a circumferential speed ratio of a circumferential speed of the first developing roller to a circumferential speed of the photosensitive body is within a rage of 0.5 to 2.5; and the moving direction of the second developing roller is equal to the moving direction of the photosensitive body, and a circumferential speed ratio of a circumferential speed of the second developing roller to a circumferential speed of the photosensitive body is within a range of 1.5 to 3.5. A ratio of the sliding friction force between a magnetic brush for developing agent and the photosensitive body formed in the first developing roller and the sliding friction force between a magnetic brush for developing agent and the photosensitive body formed in the second developing roller is within a range of 0.9 to 2.1.
REFERENCES:
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patent: 5300987 (1994-04-01), Aoyama et al.
patent: 5416571 (1995-05-01), Yamada et al.
patent: 5491537 (1996-02-01), Suzuki et al.
patent: 5630201 (1997-05-01), Suzuki et al.
Ainoya Masayuki
Anzai Masayasu
Fujinuma Yoshitaka
Hokkyo Tomonari
Kato Koji
Hitachi Koki Co,. Ltd.
Lee S.
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