Apparatus for forming an image using an electrophotographic proc

Details Apparatus for forming an image using an electrophotographic proc Apparatus for forming an image using an electrophotographic proc

1993-12-01

1995-11-14

Royer, William J.

Photocopying

Contact printing

Light boxes

118653, 430105, 430109, G03G 1506

Patent

active

054671744

ABSTRACT:
The improved image forming method reduces the chance of toner particles of adhering or filming on the surfaces of impression members, thereby enabling the formation of high-resolution image in a consistent and reliable manner. The method uses a charging member 4 for contact charging a latent image carrier 1, a developing member 11 for impression development of a pattern of latent electrostatic image, a transfer member 18 for impression transfer of the developed toner 10, and an impression cleaning member 23 for cleaning the latent image carrier 1 after toner transfer. The toner to be used satisfies one of the following conditions: that it should have an external additive added in an amount of 0.4 to 1.2 wt %; that it should have a volume resistivity of at least 10.sup.17 .OMEGA.cm; that it should incorporate a release agent in an amount no more than 5 wt %; or that it should not include large amounts of fine particles with a size of 5 .mu.m and less, or coarse particles with a size of 12.7 .mu.m and more.

REFERENCES:
patent: 4137188 (1979-01-01), Uetake et al.
patent: 4284701 (1981-08-01), Abbott et al.
patent: 4335196 (1982-06-01), Ohmuro et al.
patent: 4407925 (1983-10-01), Liebman
patent: 5066558 (1991-11-01), Hikake et al.
patent: 5085963 (1992-02-01), Suzuki et al.
patent: 5120631 (1992-06-01), Kanbayashi et al.
patent: 5219694 (1993-06-01), Anno et al.
Patent Abstract of Japan, vol. 13, No. 98, p. 31 & JP 63-279261 A (Toshiba).

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