Piezoelectric flash-ready indicator for photographic camera

Details Piezoelectric flash-ready indicator for photographic camera Piezoelectric flash-ready indicator for photographic camera

1980-09-02

1981-09-22

Griffin, Donald A.

354 53, G03B 1502, G03B 1720

Patent

active

042906784

ABSTRACT:
A piezoelectric flexure device, mounted on a photographic camera, is used to indicate the "state of readiness" of the camera's electronic flash unit. The flexure device is operatively connected with the flash unit's storage capacitor so that the flexure device is subjected to an electric field proportional to the level of charge on the storage capacitor. Since the shape of a flexure device depends upon the electric field across it, its appearance provides a visual indication to the camera user of the level of charge on the flash capacitor and, hence, the "readiness" of the energizing circuit. Preferably, the flexure device is made of a piezoelectric plastic film, such as PVF.sub.2, which exhibits substantial deformation in the presence of an electric field which can be readily produced by the DC power supply in conventional flash units.

REFERENCES:
patent: 2856562 (1958-10-01), Grimm
patent: 2894174 (1959-07-01), Schankler
patent: 3120791 (1964-02-01), Bundschuh et al.
patent: 3374718 (1968-03-01), Hochretter
patent: 3416422 (1968-12-01), Dietrich et al.
patent: 3500451 (1970-03-01), Yando
patent: 3668985 (1972-06-01), Wazumi
patent: 3727527 (1973-04-01), Borowski et al.
patent: 3831079 (1974-08-01), Iwata
patent: 3912830 (1975-10-01), Murayama et al.
patent: 3971250 (1976-07-01), Taylor
The Article by C. P. Germano entitled "Flexure Mode Piezoelectric Transducers", IEEE Transactions on Audio and Electroacoustics, vol. AU-19, No. 1, Mar. 1971.

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