Electrophotography – Image formation – Development
Patent
1995-10-27
1997-08-05
Pendegrass, Joan H.
Electrophotography
Image formation
Development
399270, 399277, 430 45, G03G 1501
Patent
active
056551916
ABSTRACT:
In a color image forming apparatus, as the second and subsequent development processes of the simultaneously transfer type, a non-contact type AC field double-element development is employed, and an absolute value of the difference between the maximum bias which provides the maximum toner developing electric field in the direction to the side of the latent image carrier and the average value of the developing bias is set larger than an absolute value of the difference between the minimum bias voltage which provides the minimum toner developing electric field in the direction to the side of the latent image carrier and the average value of the developing bias, while the bias voltage region located between the maximum bias voltage and the average bias voltage is set to a ratio of from 0.25 to 0.45 for one period of the AC voltage, and the frequency of the bias voltage is set from 4 kHz to 10 kHz.
REFERENCES:
patent: 4089297 (1978-05-01), Morita et al.
patent: 4797335 (1989-01-01), Hiratsuka et al.
patent: 5030996 (1991-07-01), Tajima et al.
Ando Shigehito
Edure Tadakazu
Furuya Nobumasa
Sasahara Shinji
Sumikawa Takeshi
Fuji 'Xerox Co., Ltd.
Pendegrass Joan H.
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