Apparatus for forming images from positive and negative original

Details Apparatus for forming images from positive and negative original Apparatus for forming images from positive and negative original

1986-02-13

1986-12-09

Prescott, A. C.

Photocopying

Including fiber optics

355 8, 355 11, 355 71, G03G 1500

Patent

active

046277030

ABSTRACT:
An image forming apparatus which is capable of forming a positive image either from a negative original or a positive original. The apparatus is provided with a device for preventing the non-image area of the photosensitive member from being developed by a developer, so as to avoid a wastefull consumption of the developer. The operation of the preventing means is controlled in dependence on whether the original is positive or negative, so that the prevention of the non-image area development is effectively performed independently of whether the original is negative or positive.

REFERENCES:
patent: 2890968 (1959-06-01), Giaimo, Jr.
patent: 3600083 (1971-08-01), Leedom
patent: 3671120 (1972-06-01), Kuehnle
patent: 4239374 (1980-12-01), Tatsumi et al.
patent: 4305650 (1981-12-01), Knox
patent: 4306804 (1981-12-01), Sakamoto et al.
patent: 4376577 (1983-03-01), Okamoto
patent: 4500195 (1985-02-01), Hosono
patent: 4511237 (1985-04-01), Kawata et al.
patent: 4519694 (1985-05-01), Kashiwagi et al.

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