| 摘要 |
A diaphragm of an optical-acoustic transducer, which improves placement and a shape of a suspension in a cantilever form, and is compact with high performance and suitable for mass production, is provided. In the optical-acoustic transducer in which a light emitter and a light receiver are placed to oppose to a reflecting portion formed on a vibrating section of a diaphragm constructed by connecting the vibrating section and a supporting portion with cantilevers, light is irradiated to the reflecting portion from the light emitter, and a reflected light from the reflecting portion is received with the light receiver to detect a position of the vibrating section, the cantilevers are formed by performing slit working for the diaphragm, portions between an outer circumference edge of the vibrating section and inner circumference edges of the cantilevers and portions between an inner circumference edge of a supporting portion and outer circumference edges of the cantilevers are partitioned by the slit working, and the cantilevers extend along an outer circumference of the vibrating section.
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