Patent ID: 7391976
Filing Date: 2008-06-24
Classification: H04R

Abstract:
1. An optical acoustoelectric transducer, said transducer comprising: a vibrating board vibrating due to sound pressure; a light-emitting device for irradiating a light beam on said vibrating board; a plurality of light-receiving elements for receiving the reflected light of said light beam irradiated on said vibrating board and outputting a signal corresponding to the vibration displacement of said vibrating board; a bottom plate comprising said light-emitting device and said light-receiving elements placed thereon and provided opposite to said vibrating board; and a supporting side plate for coupling said vibrating board and said bottom plate to be mounted almost in parallel and closely, wherein said light-emitting device and light-receiving elements are placed almost in the center of said bottom plate, with a first opening of a size allowing a sound wave to enter provided in a periphery, wherein a second opening of a size allowing a sound wave to enter is provided on said supporting side plate, wherein said optical acoustoelectric transducer has a light emitting/receiving device wherein said light-emitting device and said light-receiving elements are placed on the same substrate, said light-emitting device being a vertical cavity surface-emitting light-emitting device whose intensity distribution of light emission is concentrically almost even and being placed in the center of said substrate, said light-receiving elements being placed concentrically to surround said light-emitting device.