Single lens reflex camera with electrical shutter

Details Single lens reflex camera with electrical shutter Single lens reflex camera with electrical shutter

1978-12-04

1980-05-13

Griffin, Donald A.

354235, 354238, G03B 1912, G03B 908, G03B 964

Patent

active

042026156

ABSTRACT:
A single lens reflex camera with electrical shutter comprises an electromagnet assembly which is energized from a power supply whenever the supply voltage is above a given level. The camera includes a movable reflecting mirror which is adapted to move upwardly in response to a shutter release operation. The camera comprises a mirror blocking mechanism which permits an upward movement of the mirror when the electromagnet assembly is energized, but which blocks the mirror in the course of its upward movement when the electromagnet assembly is not energized to provide an alarm that the supply voltage is reduced. A self-timer delay circuit is also provided to delay the energization of the electromagnet assembly.

REFERENCES:
patent: 3768390 (1973-10-01), Kobori
patent: 3824612 (1974-07-01), Uno et al.
patent: 3829873 (1974-08-01), Imura et al.
patent: 3875580 (1975-04-01), Watanabe et al.
patent: 3955209 (1976-05-01), Akiyama
patent: 3961343 (1976-06-01), Shono

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