Exposure mode selectro for automatically selecting automatic exp

Details Exposure mode selectro for automatically selecting automatic exp Exposure mode selectro for automatically selecting automatic exp

1985-03-01

1987-04-21

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 55, 355 69, 355 68, G03G 1500

Patent

active

046592091

ABSTRACT:
An electrophotographic copying machine of the type in which an automatic exposure control mode and a manual exposure control mode can be selected, includes an automatic exposure control mode selection circuit for automatically selecting the automatic control mode. The automatic exposure control mode selection circuit serves to automatically select the automatic exposure control mode in response to the start of power supply or after the copying machine is left unoperated for a predetermined length of time. A timer is provided for counting this predetermined time. For a copying machine of a magnification-changeable type, the automatic exposure control mode selection circuit is operated to automatically select the automatic exposure control mode in response to the selection of magnification.

REFERENCES:
patent: 4222660 (1980-09-01), Furuichi et al.
patent: 4361395 (1982-11-01), Washio et al.
patent: 4394087 (1983-07-01), Irie et al.
patent: 4564287 (1986-01-01), Suzuki et al.

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