US 7,010,142 B2Granted

Electrical acoustic converter

AssigneeCitizen Electronics Co., Ltd.

InventorsAtsushi Kuwabara, Akira Yoneyama, Yoshizumi Ohta, Terumi Kobayashi

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Abstract

Disposed within a space formed between a base cover (2) and a top cover (1) attached to the base cover (2) is an electromagnetic sound generating part which has a diaphragm (9) attached to the base cover (2) and a drive part causing the diaphragm (9) to vibrate. The drive part includes a yoke (5) fitted in the base cover (2), a magnet (7) mounted on the yoke (5), a top plate (8) mounted on the magnet (7) and an exciting coil (6) disposed to oppose to side surfaces of the magnet (7) and top plate (8). Coil contact springs (10) are contained into housings (2a) provided on portions of the base cover inside than an outer peripheral edge of the diaphragm. The coil contact springs (10) act to connect the exciting coil (6) with an outside power source. The base cover (2) is provided with a pair of connecting pieces (11) or lead frames which are used to connect the exciting coil (6) and coil contact springs (10). The connecting pieces (11) are embedded in the base cover (2).

Claims7

Dependent claims

An electrical acoustic converter, comprising:

a base cover;
an electromagnetic sound-generating part having a diaphragm which is disposed to extend in a radial direction of said base cover and which is attached to said base cover;
a pair of coil contact springs provided on said base cover for connecting said electromagnetic sound-generating part with an outside power source;
and
a pair of connecting pieces provided outside said base cover for electrically connecting said coil contact springs with said electromagnetic sound-generating part,
said electromagnetic sound-generating part including a drive part which has an exciting coil and causes the diaphragm to vibrate,
said exciting coil having lead wires,
said coil contact springs being contained in housings provided on outside portions of the base cover and within an outer peripheral edge of the diaphragm in plan view,
each of the coil contact springs having one end formed to extend horizontally, and
an end of each of the lead wires extending from the exciting coil along the diaphragm and around an outside end of the base cover, and said horizontally extending end of each coil contact spring and the end of each of the lead wires extending from the exciting coil being electrically connected at each of said connecting pieces.

7 more elements

Dependencies are inferred from the claim text.