Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1989-02-28
1990-12-18
Goodrow, John L.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
355252, G03G 1508
Patent
active
049785974
ABSTRACT:
An image forming apparatus, comprises an electrostatic image-bearing member for holding an electrostatic charge image and a toner-carrying member having a surface for carrying a magnetic toner thereon, wherein the surface of the toner-carrying member has an unevenness comprising sphere-traced concavities formed by blasting with particles with a definite spherical shape; the magnetic toner comprisaes 17-60% by number of particles of 5 microns or smaller, 1-23% by number of particles of 8-12.7 microns, and 2.0% by volume or less of particles of 16 microns or larger and has a volume-average particle size of 4-11 microns; the electrostatic image-bearing member and the toner-carrying member are disposed with a prescribed gap therebetween at a developing station; means for forming a magnetic toner layer on the toner-carrying member in a thickness which is thinner than the prescribed gap; and means for applying an alternating electric field for development with the magnetic toner at the developing station. The surface of the toner-carrying member comprising the sphere-traced concavities allows the forming of a uniform thin toner layer thereon when combined with the magnetic toner having a specific particle size distribution while the soiling of the surface is prevented for a long period of use.
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patent: 4289837 (1981-09-01), Gundlach
patent: 4377332 (1983-03-01), Tamura
patent: 4380966 (1983-04-01), Isaka et al.
patent: 4822711 (1989-04-01), Itaya et al.
Abstract 60-57859, Masuo Yamazaki, Magnetic Microcapsule Toner, Aug. 7, 1985, vol. 9, No. 190 (P-378)[1913].
Abstract 58-11974, Masaaki Sakura, Developing Device, Apr. 6, 1983, vol. 7, No. 82 (P-189)[1227].
Abstract 62-143075, Hidenobu Yamane, Developing Device, Dec. 5, 1987, vol. 11, No. 373 (P-643)[2820].
Nakahara Toshiaki
Tanikawa Hirohide
Canon Kabushiki Kaisha
Goodrow John L.
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