| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem where a conventional cellular phone using a bone conduction speaker has performed body sensible vibration, acoustic reproduction and bone conduction sound transmission using a piezoelectric element or the like however since there is no stroke in vibration, it was difficult to obtain sufficient body sensible vibration. SOLUTION: When mounting the bone conduction speaker in the cellular phone, the bone conduction speaker is mounted so as to share a part of case with a cellular phone casing, so that when driving the bone conduction speaker, vibration can be transmitted to a user in a state where attenuation is reduced. Consequently the bone conduction speaker is mounted in the cellular phone and both bone conduction sound and body sensible vibration can be output with a single device, so that bone conduction sound can be sensed over all the cellular phone casing. COPYRIGHT: (C)2008,JPO&INPIT
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