Shutter release device in camera

Details Shutter release device in camera Shutter release device in camera

1974-10-10

1976-03-23

Hix, L. T.

354 50, 354 60R, 354266, 354267, G03B 708, G03B 1738

Patent

active

039464083

ABSTRACT:
A separate annular actuator button surrounding the shutter release button and provided with its own mechanical stop is used to move the shutter release button just far enough to switch in the storage capacitor of a TTL light measuring system of a single-lens reflex camera. This annular button can conveniently and naturally be depressed in advance of direct manipulation of the shutter release button, assuring enough time for charging the capacitor rather than relying on the rate of direct manual depression of the shutter release button to interpose enough time between capacitor switch-in and shutter release. The capacitor charging which determines the timing of shutter closing is stopped by breaking the charging current before mirror movement or lens stop-down.

REFERENCES:
patent: 3603228 (1971-09-01), Kremp et al.
patent: 3756131 (1973-09-01), Kuramoto et al.
patent: 3831180 (1974-08-01), Tsujimoto

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