Thermal motion transducer

Electricity: motive power systems – Motor-reversing – Armature or primary circuit control

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Details

179110R, 318117, H04R 1500

Patent

active

043107311

ABSTRACT:
A source of driving signals is coupled to a thermal transducer wire to provide a completed circuit. The source may include a DC bias supply and an audio amplifier. The bias supply heats the wire to a predetermined temperature, and the amplifier heats and cools the wire above and below the predetermined temperature. The wire expands and contracts in response to the audio signals, thus providing for acoustic reproduction thereof. The wire may be coupled to a diaphragm, such as a conventional speaker cone, to accomplish the acoustic reproduction. A lever arrangement coupled between the wire and the diaphragm may be employed to obtain increased diaphragm motion. A lever arrangement employing two wires in a push-pull configuration is also provided for obtaining increased motion. Additionally, a true RMS meter and a relay are provided which incorporate the heated wire thermal motion arrangement.

REFERENCES:
patent: 543313 (1895-07-01), Patrick
patent: 1292105 (1919-01-01), Shoenberg
patent: 1834498 (1931-12-01), Parshall
patent: 2263308 (1941-11-01), Mason
patent: 2555882 (1951-06-01), Guajardo
patent: 2777077 (1957-01-01), Lorini
patent: 2926293 (1960-02-01), Camm et al.
"Electrostrictive Ceramics," by Turner, Radio -Electronics for Sep. 1959, pp. 30-31.

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