Image reversal electrostatographic apparatus

Details Image reversal electrostatographic apparatus Image reversal electrostatographic apparatus

1978-07-24

1980-04-29

Braun, Fred L.

Photocopying

Including fiber optics

G03G 1500

Patent

active

042003873

ABSTRACT:
An electrostatic charge is applied to the entire surface of a photoconductive drum (12) and a light image of a negative original document (16) such as a microfilm is radiated onto an image area of the drum (12) to form an electrostatic image. A developing unit (17) applies a toner substance (18) charged with the same polarity as the electrostatic image to the drum (12) to develop the electrostatic image into a toner image. The toner adheres to areas of the electrostatic image having low potential, thereby forming a positive toner image which is transferred and fixed to a copy sheet (19). The developing unit (17) comprises a biasing member (22), (27) for producing an electric field of the same polarity as the electrostatic image for repelling the toner substance against the drum (12), the electric field being insufficiently strong to cause the toner substance to adhere to non-image areas of the drum (12).

REFERENCES:
patent: 3120790 (1964-02-01), Carlson et al.
patent: 3950089 (1976-04-01), Fraser et al.
patent: 3977778 (1976-08-01), Seko et al.

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