Electro-acoustic transducer
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United States of America Patent
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Oct 6, 2015
Grant Date -
Mar 26, 2015
app pub date -
Jul 30, 2014
filing date -
Sep 25, 2013
priority date (Note) -
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Abstract
An electro-acoustic transducer includes a frame, a magnet circuit unit accommodated in the frame, and a vibration unit engaging with the frame. The magnetic circuit unit includes a lower plate, a main magnet positioned centrally on the lower plate, a pair of auxiliary magnets positioned spaced from the main magnet for forming a magnetic gap, and a pair of upper plates attached to the auxiliary magnets, respectively. Each upper plate includes a base body integrated with the frame, and a restricting part extending from the base body and engaging with an inner surface of the auxiliary magnet facing the main magnet.
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