Electro-acoustic transducer

Details Electro-acoustic transducer Electro-acoustic transducer

H - Electricity

04

R

181/6, 349/72

H04R 1/20 (2006.01) C08L 63/00 (2006.01) H04R 7/02 (2006.01) H04R 9/04 (2006.01) H04R 9/06 (2006.01)

Patent

CA 1130910

ABSTRACT OF THE DISCLOSURE 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 tra- versed 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.

333842

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