Photocopying – Contact printing – Light boxes
Patent
1994-06-21
1995-07-04
Beatty, Robert B.
Photocopying
Contact printing
Light boxes
355296, G03G 500
Patent
active
054305276
ABSTRACT:
An image forming apparatus has a photosensitive member, a charging device, an image exposure device for exposing the photosensitive member to form a latent image, a developing device for developing the latent image with a toner to form a transferable toner image on the surface of the photosensitive member, a transfer device for transferring the toner image to a transfer material, and a cleaning device for removing a residual toner; the charging device, image exposure device, developing device, transfer device and cleaning device being disposed in the named order along the moving direction of the photosensitive member. The charging device includes an electroconductive member which directly contacts the photosensitive member surface to charge the photosensitive member surface. The electroconductive member forms a nip width with the photosensitive member of at least 0.5 mm and a load per unit contact area between the electroconductive member and photosensitive member is between 0.5-30 g/mm.sup.2. With respect to the longitudinal direction of the photosensitive member, the width of the photosensitive member surface cleaned by the cleaning device is equal to or greater than the width of the photosensitive member surface contacting the electroconductive member.
REFERENCES:
patent: 2892973 (1959-06-01), Straughan
patent: 4278342 (1981-07-01), Andrew et al.
patent: 4547060 (1985-10-01), Lindblad
patent: 4654288 (1987-03-01), Hiro et al.
patent: 4727453 (1988-02-01), Ewing
Kishi Junichi
Maruyama Akio
Ohmori Hiroyuki
Okunuki Masami
Beatty Robert B.
Canon Kabushiki Kaisha
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