Power source switch for cameras

Details Power source switch for cameras Power source switch for cameras

1978-08-16

1980-04-22

Gellner, Michael L.

G03B 1738

Patent

active

041992458

ABSTRACT:
In a still or motion picture camera including an electric circuit such as a light measuring circuit, an exposure control circuit, a sound recording circuit, or a capstan driving circuit, the shutter release button is provided with a piezo-electric element for developing an electric charge or potential difference when an external pressure is applied thereon. The pressure responsive piezo-electric element is connected in the electric circuit in response to the pressure applied on the pressure responsive element, whereby the electric circuit is enabled prior to the commencement of the exposure.

REFERENCES:
patent: 3211069 (1965-10-01), Rixton
patent: 3599548 (1971-08-01), Hennig
patent: 3678821 (1972-07-01), Kitai
patent: 3810228 (1974-05-01), Taguchi et al.
patent: 3868700 (1975-02-01), Kuramoto

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