| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a directive acoustic-electric transducer in a small size that has a broadband characteristic. SOLUTION: In the acoustic-electric transducer provided with a diaphragm 2 vibrated by sound, a light emitting element LD that emits a light to the diaphragm 2, and a photodetector PD that converts a displacement of the diaphragm 2 by sound into a change in an electric signal and outputs the electric signal in a housing 1, N (N is an integer of >=2) pieces of the diaphragms 2 are arranged in parallel on different planes at a prescribed interval and the light emitting elements LD and the photodiodes PD are provided corresponding to the respective diaphragms 2.</p> |
