Small type acoustic device

Details Small type acoustic device Small type acoustic device

1981-10-15

1984-04-24

Swann, III, Glen R.

Communications: electrical

Audible indication

Ultrasonic pest control

340387, 368255, G08B 300

Patent

active

044451130

ABSTRACT:
A small acoustic device is provided with a housing, a first electrically actuated vibrating plate and a second vibrating plate. A support member cooperates with the housing for mounting the periphery of the second vibrating plate to the housing to define therewith an airtight chamber. The support member also supports the periphery of the first vibrating plate in the airtight chamber with a gap between the two vibrating plates and air chambers on either side of the second vibrating plate. In this way, the barometric pressure in the two air chambers on either side of the second vibrating plate are equivalent and the device is both waterproof and independent of ambient temperature changes.

REFERENCES:
patent: 3777472 (1973-12-01), Iinuma
patent: 3879931 (1975-04-01), Yasuda et al.
patent: 3931549 (1976-01-01), Berns
patent: 4159472 (1979-06-01), Murakami et al.
patent: 4183017 (1980-01-01), Sims

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