Photocopying – Contact printing – Light boxes
Patent
1991-10-10
1992-08-11
Grimley, A. T.
Photocopying
Contact printing
Light boxes
118657, 355253, G03G 1509
Patent
active
051383870
ABSTRACT:
An image forming apparatus includes a photoreceptor including a glass substrate and a photoconductive layer laminated thereon. A toner box is provided in the vicinity of the photoreceptor, in which a mixed toner including an insulative non-magnetic toner and a conductive magnetic toner is contained. At an opening of the toner box, a magnetic roller and a developing sleeve which is rotatably put on the magnetic roller are arranged, and a magnetic brush of the mixed toner is formed according to a rotation of the developing sleeve so that the mixed toner is brought into contact with the photoconductive layer. A developing bias having the same polarity as a charged polarity of the insulative non-magnetic toner is applied between the developing sleeve and the photoconductive layer and, at the same time, an exposure light is projected from an LED array on the photoconductive layer through the glass substrate.
REFERENCES:
patent: 4545669 (1985-10-01), Hays et al.
patent: 4649094 (1987-03-01), Tamura et al.
patent: 4666801 (1987-05-01), Kimura et al.
patent: 4804994 (1989-02-01), Sasaki et al.
patent: 4950570 (1990-08-01), Sano et al.
patent: 5053821 (1991-10-01), Kunugi et al.
Goto Youichiro
Nose Toru
Sato Michiaki
Yamamura Toru
Grimley A. T.
Royer William J.
Sanyo Electric Co,. Ltd.
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