Citizen Electronics Co., Ltd.

Akira Yoneyama

Takashi Kobayashi

Atsushi Kuwabara

Yoshizumi Ohta

Toshio Itakura

Terumi Kobayashi

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

Electrical acoustic converter

A vibrating assembly comprises a yoke having a center pole and a peripheral flange, an annular permanent magnet secured to the flange, and an annular top plate secured to the permanent magnet. A supporting plate is provided for resiliently supporting the vibrating assembly in the frame. A preventing means is provided for preventing the vibrating assembly from moving in a radial direction of the vibrating assembly.

Vibrating device for transmitting information

A vibrating plate is mounted in a case, and a first coil is secured to the vibrating plate. A magnetic circuit composition is mounted in the case. The magnetic circuit composition comprises a yoke having a flange and a core formed on the flange, an annular magnet mounted on the flange of the yoke, and a top plate comprising an annular portion and a cylindrical portion projection from a peripheral portion of the annular portion. The magnetic circuit composition is resiliently supported in the case. A coil holding plate is secured to the case, and a second coil is secured to the coil holding plate. The first coil is inserted in a first magnetic gap formed in the magnetic circuit composition and the second coil is inserted in a second magnetic gap formed in the magnetic circuit composition.

Multiple-function convertor for converting electric signals to vibration of elements of a portable electronic instrument

A diaphragm is mounted in a cover for producing sounds, a vibrating assembly including a pole piece is resiliently mounted in the cover so as to be vibrated. A receiving portion is formed on the pole piece of the vibrating assembly for receiving a mass adjusting adhesive, so that the vibration frequency of the vibrating assembly is adjusted to a predetermined frequency.

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Yamanashi-ken, Japan

Akira Yoneyama