Single-lens reflex camera having electronic shutter

Details Single-lens reflex camera having electronic shutter Single-lens reflex camera having electronic shutter

1974-06-20

1976-04-13

Hix, L. T.

354234, G03B 1912, G03B 958

Patent

active

039507700

ABSTRACT:
An apparatus includes a control member to be actuated in operative relation to the swing-up motion of the mirror and a mechanical latch member selectively settable in a second position for electronic exposure time control and in a first position for mechanical exposure time control, the latch member being adapted to regulate at the first position the movement of an attraction member for detecting whether an electromagnet has been energized or unenergized. If it is detected that the electromagnet is inoperative when the apparatus is set for operation under electronic exposure time control, the apparatus can be made operative under mechanical exposure time control. The apparatus further includes means for preventing return of the mirror to the observing position upon detecting the inoperativeness of the electromagnet. The mirror is returnable to the normal observing position by switching the apparatus to mechanical exposure time control.

REFERENCES:
patent: 3683776 (1972-08-01), Oro
patent: 3698304 (1970-03-01), Tenkumo
patent: 3715964 (1973-02-01), Tenkumo
patent: 3759156 (1973-10-01), Kobou

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