Image forming apparatus with manual mode exposure range shifting

Details Image forming apparatus with manual mode exposure range shifting Image forming apparatus with manual mode exposure range shifting

1992-11-06

1999-01-12

Braun, Fred L.

Electrophotography

Control of electrophotography process

Control of exposure

355 69, 355 75, 399361, G03G 1504

Patent

active

058600396

ABSTRACT:
An image forming apparatus of exposing method has two exposure control modes, automatic and manual, and a controlling section to switch the mode from one to another. When the exposure control mode is switched from automatic to manual, the apparatus of this invention controls the median value of the exposing degree range, from which the users may choose, to be equal to the exposing degree determined in automatic mode. However, in case the exposing degree was not determined when in automatic mode or in case there is a signal that tells an exchange of the original, e.g. job interruption, a predetermined value is fixed to be the median of the exposing degree range.

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