Electro-acoustic transducer

Details Electro-acoustic transducer Electro-acoustic transducer

1979-08-14

1981-07-28

Robinson, Thomas A.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

179181R, 181167, 181170, G10K 1300, H04R 700

Patent

active

042812232

ABSTRACT:
An electro-acoustic transducer, such as a loudspeaker, a microphone, or the like, comprises a magnetic circuit having at least one air gap, a current conductor disposed in the air gap of the magnetic circuit to form a voice coil which is traversed by magnetic flux, and a vibratory structure mechanically coupled to the voice coil. The vibratory structure is comprised of a heat resistant film containing an epoxide-modified resin in which a heterocyclic compound containing a polyimide group is the main component. The voice coil is non-adhesively secured to the vibratory structure. For example, the voice coil is formed of a conductive substrate onto which the vibratory structure is coated and from which portions have been etched to form a generally spiral-shaped conductor. In one embodiment, the vibratory structure is a diaphragm; and in another embodiment, the vibratory structure is a bobbin having the voice coil wound thereon.

REFERENCES:
patent: 3674109 (1972-07-01), Murase
patent: 4086449 (1978-04-01), Takano
patent: 4140203 (1979-02-01), Niguchi et al.
patent: 4190746 (1980-02-01), Harwood et al.

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