Electronic photographing apparatus

Details Electronic photographing apparatus Electronic photographing apparatus

2005-10-11

2005-10-11

Grainger, Quana (Department: 2852)

Electrophotography

Image formation

Development

C399S285000

Reexamination Certificate

active

06954604

ABSTRACT:
The invention provides an electronic photographing apparatus using a two-component developer as a mixture of a toner and a carrier as well as a development unit including a developer roll having magnetic poles therein. The electronic photographing apparatus includes a development bias power source for applying to the developer roll a development bias voltage where an AC voltage is superimposed on a DC voltage. The electronic photographing apparatus develops a latent image on a photosensitive body by using toner to form an image, characterized in that the ratio of the volume of the carrier to a space sandwiched between the developer roll and the photosensitive body is set within a range from 32 percent to 46 percent and that that the resistivity of the carrier under a field strength of 2000 V/cm is set to 3×1010Ωcm or more.

REFERENCES:
patent: 4887131 (1989-12-01), Kinoshita et al.
patent: 63-25350 (1988-05-01), None
patent: 3-2304 (1991-01-01), None
patent: 7-62779 (1995-07-01), None
patent: 8-1534 (1996-01-01), None
patent: 2646221 (1997-05-01), None

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