Electromagnetic acoustic transducer with its air gap established

Details Electromagnetic acoustic transducer with its air gap established Electromagnetic acoustic transducer with its air gap established

1978-06-20

1979-07-03

Stellar, George G.

Communications: electrical

Land vehicle alarms or indicators

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

340391, H04R 1300

Patent

active

041601327

ABSTRACT:
A tone generator having a diaphragm and an electromagnet for vibrating the diaphragm to produce sound, the bobbin of the electromagnet being held in a fixed, predetermined relation to the diaphragm and connected to the retaining ring which holds the diaphragm by resilient spring arms that are stressed automatically by assembly of the tone generator to clamp the diaphragm, the pole piece of the electromagnet being held by flexible and resilient supports that are flexed automatically to retain the pole piece when the generator is assembled and to hold an end of the pole piece precisely spaced with respect to the diaphragm.

REFERENCES:
patent: 228825 (1880-06-01), Lockwood et al.
patent: 1570287 (1926-01-01), Sell
patent: 2794862 (1957-06-01), Topholm

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