Apparatus for retarding camera shutter release

Details Apparatus for retarding camera shutter release Apparatus for retarding camera shutter release

1976-12-10

1978-04-18

Hix, L. T.

354238, 354267, G03B 964

Patent

active

040854132

ABSTRACT:
An electro-mechanical shutter release delay apparatus includes a front curtain lock lever 4 sharing a common pivot axis 6 with a release lever 5 and joined to the latter by a spring 7. The depression of a shutter release rod 8 initially rotates the release lever 5 to close a first switch S.sub.1 which energizes front and rear curtain holding magnets M.sub.1 and M.sub.2. Continued depression tensions the spring and eventually closes a second switch S.sub.2. The latter energizes a flood lamp and initiates a time delay circuit, whose output deenergizes the front curtain holding magnet. The spring then rotates the lock lever to release the front curtain and commence the exposure, by which time the lamp has reached maximum intensity. After the proper exposure time has elapsed the rear curtain holding magnet is deenergized to release the rear curtain and terminate the exposure.
Self-timing may be implemented by increasing the delay period provided by the time delay circuit, and including a notched holding lever 10 to latch the release lever 5 in its rotated position.

REFERENCES:
patent: 3200722 (1965-08-01), Hutchison, Jr.
patent: 3833915 (1974-09-01), Tanaka et al.

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