Image formation apparatus

Details Image formation apparatus Image formation apparatus

1982-08-30

1984-11-13

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3DD, G03G 1508

Patent

active

044822430

ABSTRACT:
An image formation apparatus reproduces both an image of a text and a continuous tone image such as a photograph with excellent gradation. The AC bias voltage to be applied to a developing roller is controlled stepwise or continuously in accordance with the spatial frequency of an original.

REFERENCES:
patent: 2956487 (1960-10-01), Giaimo
patent: 3805739 (1974-04-01), Feldeisen et al.
patent: 4153364 (1979-05-01), Suzuki et al.
patent: 4200391 (1980-04-01), Sakamoto et al.
patent: 4213693 (1980-07-01), Imai et al.
patent: 4239374 (1980-12-01), Tatsumi et al.
patent: 4292387 (1981-09-01), Kanbe et al.
patent: 4306804 (1981-12-01), Sakamoto et al.
patent: 4352553 (1982-10-01), Hirahara

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