ELECTROMAGNETIC TRANSDUCER AND PORTABLE COMMUNICATION DEVICE
摘要
An electromagnetic transducer according to the present invention includes: a first diaphragm disposed so as to be capable of vibration; a second diaphragm disposed in a central portion of the first diaphragm, the second diaphragm being made of a magnetic material; a yoke disposed so as to oppose the first diaphragm; a center pole disposed between the yoke and the first diaphragm; a coil disposed so as to surround the center pole; a first magnet disposed so as to surround the coil; and a second magnet disposed on an opposite side of the first diaphragm from the center pole.
申请公布号
WO0070905(A2)
申请公布日期
2000.11.23
申请号
WO2000JP03083
申请日期
2000.05.12
申请人
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;USUKI, SAWAKO;SAIKI, SHUJI