Sony Corporation

Sumitomo Bakelite Company Limited

Akinobu Kusuhara

Toshinaga Endo

Hideo Suyama

Masana Ugaji

Sigenori Yamaoka

Shigenori Yamaoka

Sadaaki Sakurai

Flexible printed circuit base board and method for producing the same

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.

Electro-acoustic transducer

Growing community of inventors

Yokohama, Japan

Akinobu Kusuhara