Image forming apparatus having a contact charging device that ex

Details Image forming apparatus having a contact charging device that ex Image forming apparatus having a contact charging device that ex

1991-12-17

1994-04-19

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355245, 430111, G03G 1502, G03G 1500

Patent

active

053050614

ABSTRACT:
An image forming apparatus comprises an image carrier for carrying an electrostatic latent image on its surface, a charging member for charging the image carrier to a predetermined polarity by contacting with the surface of the image carrier, latent image forming means for forming an electrostatic latent image corresponding to image information on the surface of the image carrier charged, and a developing device containing toner including toner particles not less than 90% of which have a shape factor SF-1 expressed by the following equation of not more than 160 and less than 1% of which have a shape factor SF-1 of not less than 170 so as to develop the electrostatic latent image formed on the surface of the image carrier into a toner image:

REFERENCES:
patent: 3819367 (1974-06-01), Chatterji et al.
patent: 4455078 (1984-06-01), Mukai et al.
patent: 4469435 (1984-09-01), Nosaki et al.
patent: 4761709 (1988-08-01), Ewing et al.
patent: 4769676 (1988-09-01), Mukai et al.
patent: 4987454 (1991-01-01), Natsuhara et al.

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