Electromagnetic sonic generator for an alarm

Details Electromagnetic sonic generator for an alarm Electromagnetic sonic generator for an alarm

1976-12-23

1978-05-16

Stellar, George G.

179120, H04R 1102

Patent

active

040900410

ABSTRACT:
An electro-acoustic transducer of electromagnetic type is composed of an exciting part having a magnetic core wound with an exciting coil, a vibrating plate provided opposite to the magnetic core at an interval and a ferromagnetic thin plate mounted to the vibrating plate. The thin plate is provided on the surface of the vibrating plate on the side of the magnetic core, so that the thin plate is not exposed to the open air. Furthermore, the thin plate is connected to the vibrating plate at plural points more than three or at a part with some area. Such connection restrains undesirable vibration of the thin plate.

REFERENCES:
patent: 1738653 (1929-12-01), Inglis et al.
patent: 2078385 (1937-04-01), Kato

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