Image forming apparatus having an alternating bias electric fiel

Photocopying – Contact printing – Light boxes

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Details

118657, 355246, 430122, G03G 1509

Patent

active

052027317

ABSTRACT:
An image forming apparatus is formed by providing a latent image-bearing member for holding an electrostatic image thereon and a toner-carrying member for carrying a prescribed magnetic toner comprising a binder resin and magnetic powder and having a particle size distribution including 12% by number or more of magnetic toner particles of 5 microns or smaller, 33% by number or less of magnetic toner particles of 8-12.7 microns and 2% by volume or less of magnetic toner particles of 16 microns or larger so as to provide a volume-average particle size of 4-10 microns. At the developing station, an alternating bias voltage comprising a DC voltage and an unsymmetrical AC voltage in superposition is applied between the toner-carrying member and the latent image-bearing member to provide an alternating bias electric field comprising a development-side voltage component and a reverse-development side voltage component. The development-side voltage component has a magnitude equal to or larger than that of the reverse development-side voltage component and a duration smaller than that of the reverse-development side voltage component, so that the magnetic toner on the toner-carrying member, particularly fine powdery fraction thereof effective for high-quality development, is effectively transferred to the latent image-bearing member to develop the electrostatic image thereon at the developing station.

REFERENCES:
patent: 2297691 (1942-10-01), Carlson
patent: 3405682 (1968-10-01), King et al.
patent: 3666363 (1972-05-01), Tanaka et al.
patent: 3776722 (1973-12-01), Cantarano
patent: 3866574 (1975-02-01), Hardennrook et al.
patent: 3890929 (1975-06-01), Walkup
patent: 3893418 (1975-07-01), Liebman et al.
patent: 4071361 (1978-01-01), Marushima
patent: 4380966 (1983-04-01), Isaka et al.
patent: 4386577 (1983-06-01), Hosono et al.
patent: 4395476 (1983-07-01), Kanbe et al.
patent: 4444864 (1984-04-01), Takahashi
patent: 4565438 (1986-01-01), Folkins
patent: 4600295 (1986-07-01), Suzuki
patent: 4688923 (1987-08-01), Kohyama
patent: 4827869 (1989-05-01), Takagi
patent: 4904558 (1990-02-01), Nagatsuka et al.
patent: 4957840 (1990-09-01), Sakashita et al.
patent: 4978597 (1990-12-01), Nakahara et al.
patent: 4985327 (1991-01-01), Sakashita et al.
patent: 4992348 (1991-02-01), Hayakawa et al.
patent: 5009973 (1991-04-01), Yoshida et al.
patent: 5014089 (1991-05-01), Sakashita et al.
patent: 5157442 (1992-10-01), Tanigawa et al.

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