US RE36,327 E · Electroacoustic transducer and method of fabricating the same

Abstract

The present invention provides an electroacoustic transducer and a method of fabricating the same, employing a lead frame to integrally form a plurality of component parts, thus reducing the number of individual component parts, and improving assembly efficiency. The electroacoustic transducer comprises a base, a yoke fixed to the base, a core, a coil wound around the core, magnet surrounding the coil, a support ring surround the magnet, a vibrating plate supported on the support ring, lead terminals fixed to the base, and a case having a sound emitting cylinder and joined to the base so as to cover those components. A gap is formed between the core and the diaphragm. The diaphragm, the gap, the core, the yoke and the magnet form a closed magnetic path. The coil drives the diaphragm for vibration when energized. The yoke and the lead terminals are integrally formed of a common metal material such as the lead frame. The core may be integrally formed with the yoke of the lead frame.

Claims9

Dependent claims

An electroacoustic transducer for converting ..electric signals.!. externally applied ..to lead terminals.!. electric signals into sound, comprising:

a case provided with a base formed of a synthetic resin in the shape of a flat plate;
..a case joined to the base and integrally provided with.!. a sound emitting cylinder formed on the case for emitting sound outside the case ;
a yoke ..formed of a metal and.!. fixed to an upper surface of the base and ..covered with.!. housed in the case;
a core formed on an upper surface of the yoke;
a coil wound around the core;
an annular magnet disposed ..so as to surround.!. around the coil;
..a support ring disposed on the base so as to surround the magnet;.!.
a diaphragm formed of a magnetic material ..supported on the support ring.!. and disposed so as to form a gap between the diaphragm and the core, said diaphragm forming a closed magnetic path , via the gap , with the core, yoke and magnet, and being vibrated by the excitation of the coil;
..the.!. lead terminals formed of the same material as the yoke, fixed to the base, connected to ends of the coil and ..projecting.!. leading outside the case;
and
said yoke and said lead terminals formed of a common lead frame made of a single metal material.

8 more elements

Dependencies are inferred from the claim text.

Electroacoustic transducer and method of fabricating the same

Life of this patent

Electroacoustic transducer and method of fabricating the same

Life of this patent

Abstract

Claims9