ELECTROACOUSTIC CONVERTER

Japanese Patent JPS596699

A

An electroacoustic transducer comprises a diaphragm (1), a magnet system (4) and a voice coil (3) arranged on a voice-coil former (2) in an air gap (5) of the magnet system. The movement is transmitted between the voice-coil former and the diaphragm via a lever mechanism comprising n lever devices (6) arranged at an angle relative to each other (n>/=2). A lever device (6) comprises a lever arm (9) coupled to a fulcrum (11) at the location of a first position (10) on the lever arm, to the voice-coil former (2) at the location of a second position (13), and to the diaphragm (1) at the location of a third position (14). The lever mechanism multiplies the excursion of the voice-coil former by a factor greater than unity. This results in an electroacoustic transducer with a long stroke which provides large excursions of the diaphragm. The lever mechanism may also be employed in other types of transducer, such as piezo-ceramic transducers. A compliant element (25) formed as a zigzag bellows secured both to the outer circumference of the diaphragm and to the chassis (26) to permit the large excursion of the diaphragm, is constructed so as to reduce the acoustic contribution of the compliant element to the transducer output signal, which contribution forms a distortion component in the output signal.

JPH1155793	VIBRATION COIL DEVICE AND ITS MANUFACTURE
WO/2024/087296	MULTIFUNCTIONAL SOUND PRODUCTION DEVICE

YURISU ADERUBERUTO MARIA NIUBE
HEORUGIUSU BERUNARUDASU YOSEFU
KORUNERISU DEIONISHIUSU FUAN D
ADORIANUSU YOZEFU MARIA KAIZER

JP11199583A

January 13, 1984

June 23, 1983

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PHILIPS NV

H04R9/04; H04R7/20; H04R9/06; (IPC1-7): H04R7/20; H04R9/04; H04R9/06

JP54153224B

Akihide Sugimura

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