发明名称 ELECTROMAGNETIC ELECTROACOUSTIC TRANSDUCER
摘要 The invention relates to an electromagnetic electroacoustic transducer, for example, used in a ringer of a cellular phone. A resin-bonded magnet (11) is formed of a magnetically hard material and a magnetically soft material. The magnet has a magnetic gap, the flux density in which can be changed depending on the proportion of the magnetically soft material so that the lowest resonance frequency can be set easily. The magnetically soft material increases the permeability of the resin-bonded magnet (11), thereby increasing the flux density. This increases the force for driving the vibrator and provides a small electroacoustic transducer capable of producing high sound pressure.
申请公布号 WO0118787(A1) 申请公布日期 2001.03.15
申请号 WO2000JP06033 申请日期 2000.09.06
申请人 MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;ANDOU, KIMIHIRO;ENOMOTO, MITSUTAKA;SUZUMURA, MASAKI;MINAGA, KATSUHIKO;SAIKI, SYUJI;USUKI, SAWAKO 发明人 ANDOU, KIMIHIRO;ENOMOTO, MITSUTAKA;SUZUMURA, MASAKI;MINAGA, KATSUHIKO;SAIKI, SYUJI;USUKI, SAWAKO
分类号 G10K9/13;H01F7/06;H04M1/03;H04R13/00;(IPC1-7):G10K9/13 主分类号 G10K9/13
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