Electrophotography – Control of electrophotography process – Control of developing
Patent
1998-10-13
2000-04-18
Braun, Fred L.
Electrophotography
Control of electrophotography process
Control of developing
G03G 1506
Patent
active
060525444
ABSTRACT:
An image forming apparatus includes a photosensitive member and a developer carrying member spaced from the photosensitive member by a gap. The developer carrying member carries a developer containing an externally added strontium titanate. A bias voltage is applied between the photosensitive member and the developer carrying member with a substantially rectangular waveform. This bias voltage forms an oscillating electric field therebetween. The electric field provided by the difference between a jump peak voltage of the bias voltage and the potential of the photosensitive member at a portion exposed to the light is not less than 4.1 V/micron. The electric field provided by a difference between the jump peak voltage and a potential of the photosensitive member at a portion not exposed to light is not more than 3.5 V/micron. The electric field provided by a difference between a returning peak voltage of the bias voltage and a potential of the photosensitive member at a portion not exposed to light is not more than 2.9 V/micron. A ratio of a portion of the voltage for the direction toward the photosensitive member is 20 to 50%.
REFERENCES:
patent: 5066979 (1991-11-01), Goto et al.
patent: 5202731 (1993-04-01), Tanikawa et al.
patent: 5534982 (1996-07-01), Sakaizawa et al.
patent: 5655191 (1997-08-01), Furuya et al.
patent: 5794111 (1998-08-01), Tombs et al.
Domon Akira
Shimizu Yasushi
Braun Fred L.
Canon Kabushiki Kaisha
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