| 摘要 |
PROBLEM TO BE SOLVED: To provide a wireless microphone preventing the damage of a reflection member by impact, such as a fall, in the optical wireless microphone having the reflection member capable of prescribing a direction by gravity. SOLUTION: The wireless microphone 1 has the reflection member 33 capable of prescribing the emission direction of a light signal and a control means for suppressing the displacement of the reflection member by impact. The control means consists of a vibration detection means and a displacement suppression means. The vibration detection means detects vibration by the impact and can be set to be a piezoelectric element 35 generating voltage according to a change in pressure by axial vibration to be applied. The displacement suppression means comprises a fluid member 34 increasing viscosity by applying voltage to support a reflection member, and an application means consisting of an electrode 36 connecting the piezoelectric element 35 to the electrorheological fluid 34 electrically and conductive wiring 37. COPYRIGHT: (C)2008,JPO&INPIT
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