| 摘要 |
PURPOSE:To decrease output sound pressure of the low frequency band and to make reproducibility of a frequency characteristic good by installing an acoustic sound discharging hole near the center of the surface of the electroacoustic transducer and an acoustic leaking hole near the peripheral area and further, supporting the electroacoustic transducer through a rubber ring to a fitting body. CONSTITUTION:An electroacoustic transducer 7 is fixed to a fitting body 9 with a jig 11. An acoustic sound discharging hole 16 is formed near the center of a case 13 of the electroacoustic transducer 7 and an acoustic leaking hole 17 is formed near the peripheral area. A rubber ring 8 is accommodated in a ring-shaped groove 21 installed in the fitting body 9 around a sound discharging hole 10, the acoustic leaking hole 17 near the peripheral area of the electroacoustic transducer 7 and the acoustic sound discharging hole near the center are separated, and in such a way, the ring is adhered closely to the case 13 of the electroacoustic transducer. |
