发明名称 |
Wristwatch with piezoelectric buzzer |
摘要 |
A wristwatch having a piezoelectric buzzer therein includes a watch case and a case back. The piezoelectric buzzer includes a piezoelectric element mounted on the case back inside the watch case. A driver selectively applies signals having a frequency of about 4 kHz to the buzzer. The case back, acting as the vibration plate for the piezoelectric element, is constructed so that the resonance frequency thereof is between 5.5 kHz and 7 kHz.
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申请公布号 |
US4459037(A) |
申请公布日期 |
1984.07.10 |
申请号 |
US19830546069 |
申请日期 |
1983.10.27 |
申请人 |
KABUSHIKI KAISHA SUWA SEIKOSHA |
发明人 |
TOYODA, MITSURU |
分类号 |
G04C21/34;G04G13/02;(IPC1-7):G04C21/00 |
主分类号 |
G04C21/34 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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