Developing apparatus

Details Developing apparatus Developing apparatus

2006-04-25

2008-08-12

Lee, Susan S (Department: 2852)

Electrophotography

Image formation

Development

C399S277000

Reexamination Certificate

active

07412194

ABSTRACT:
The present invention provides a developing apparatus that can effectively prevent generation of a ghost due to poor detachment of a developer after development, and generation of unevenness in density between a left part and a right part of an image region due to lack of an amount of the developer transported. The developing apparatus satisfies the relationshipin-line-formulae description="In-line Formulae" end="lead"?r+R≦d≦3r+Rin-line-formulae description="In-line Formulae" end="tail"?where r denotes a rotational radius of a second developer transporting screw, R denotes a rotational radius of a development roller, and d denotes a center distance between the second developer transporting screw and the development roller. The developing apparatus also satisfies the relationshipin-line-formulae description="In-line Formulae" end="lead"?M0≧(mg0×v×l)/0.02in-line-formulae description="In-line Formulae" end="tail"?where mg0 (g/mm2) denotes an amount of a toner per unit area that is supplied from the development roller to an electrostatic latent image having 100% image coverage which is formed on a photosensitive drum, v (mm/s) denotes a rotational peripheral velocity of the photosensitive drum, l (mm) denotes a maximum printing width on the photosensitive drum, and M0 (g/s) denotes an amount of the developer transported per unit time by the second developer transporting screw in a second developer transport direction.

REFERENCES:
patent: 4959692 (1990-09-01), Hayashi et al.
patent: 5143017 (1992-09-01), Haneda et al.
patent: 5151739 (1992-09-01), Hediger
patent: 11-065247 (1999-03-01), None
patent: 2001-356545 (2001-12-01), None
English Language Abstract of JP 2001-356545.
English Language Abstract of JP 11-065247.

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