US 2003/0112994 A1Published application

Electroacoustic transducer

AssigneeStar Micronics Co., Ltd.

InventorsYoshio Imahori, Hiroshi Fujinami, Yoshiharu Oishi, Takahiro Sone

Life of this patent

Estimating the term…

Loading patent…

Abstract

An electroacoustic transducer adapted to be mounted on a printed circuit board in which a coil spring is accommodated and supported in a cylindrical recess of a frame while it is fixed to neither a terminal plate nor the frame. Particularly, a protruding pin of the coil spring is passed through a though hole of the terminal plate to allow a leading portion of the protruding pin to be hooked thereon. When the electroacoustic transducer is mounted on the printed circuit board, any horizontal displacement between the compressed spring and the printed circuit board would not cause stress concentration on the coil spring since the coil spring is onlly horizontally shifted in the cylindrical recess until a coil portion of the coil spring hits against the wall of the cylindrical recess.

Claims5

Dependent claims

An electroacoustic transducer adapted to be mounted on a printed circuit board comprising:

a casing;
a terminal plate fixed to the casing at a position away from a casing surface opposite the printed circuit board;
and
a coil spring for making electrical connections between the terminal plate and a conductive portion of the printed circuit board when the electroacoustic transducer is mounted on the printed circuit board;
wherein, a cylindrical recess is formed on the casing so as to extend from the casing surface to the terminal plate;
the coil spring has a coil length longer than that of the cylindrical recess by a predetermined dimension, and a coil diameter smaller than the inner diameter of the cylindrical recess by a predetermined dimension;
and
the coil spring is accommodated and supported in the cylindrical recess while it is fixed to neither the terminal plate nor the casing.

5 more elements

Dependencies are inferred from the claim text.