Piezoelectric buzzer

Details Piezoelectric buzzer Piezoelectric buzzer

1979-08-30

1981-07-14

Robinson, Thomas A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

179110A, 179146R, 340384E, H04R 128, G08B 300

Patent

active

042788510

ABSTRACT:
A piezoelectric buzzer comprises: a piezoelectric transducer; a casing comprising a hollow body having one end closed by a perforated end wall, a lid adapted to close the other end of the hollow body, and an annular groove defined on the inner peripheral surface of the open end of the hollow body for loosely receiving the peripheral portion of the lid. The annular groove and the lid are so dimensioned and so shaped as to avoid any undesired suppression of the frequency of resonance of the casing which takes place during vibration of the transducer.

REFERENCES:
patent: 3732446 (1973-05-01), Bryant
patent: 3737690 (1973-06-01), Antonio
patent: 3879726 (1975-04-01), Sweany
patent: 4028504 (1977-06-01), Massa

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