Camera with electronic flash and piezoelectric lens motor

Details Camera with electronic flash and piezoelectric lens motor Camera with electronic flash and piezoelectric lens motor

1980-10-03

1981-09-29

Gellner, Michael L.

Optics: motion pictures

Removable film strip magazine type

352140, 354195, G03B 310

Patent

active

042919584

ABSTRACT:
An autofocus camera includes an electronic flash and a piezoelectric focus motor that are both powered by a moderately high voltage power supply. The camera includes an automatic focus detector that senses a scene and produces a focus signal representing the required focus adjustment for the scene. A focus motor drive circuit responsive to the focus signal supplies a controlled amount of power from the power supply to the piezoelectric focus motor to drive a movable lens element to effect the required focus adjustment.

REFERENCES:
patent: 3917395 (1975-11-01), Ogawa
patent: 3932700 (1976-01-01), Snopko
patent: 3945023 (1976-03-01), Stauffer
patent: 3974327 (1976-08-01), Van Dijk
patent: 3997715 (1976-12-01), Elliott
IEEE Transactions on Audio and Electroacoustics, vol. AV-19, No. 1, Mar. 1971, "Flexure Mode Piezoelectric Transducers" by C.P. Germano.

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