| 摘要 |
<p>PURPOSE:To ensure the selective operation between the transmission and reception state, by operating the selective means between the transmission and reception state with the output of the oscillation pick up unit provided separately with the electric- acoustic mutual converter. CONSTITUTION:Electric signal from the piezoelectric element 7 of the electro-acoustic mutual converter 9 is fed to the transmitter of the transceiver 10 via the selective means 16 and electric signal from the receiver is fed to the sound pressure type conversion element 1 via the selective means 16. The electrical connection between the piezoelectric element 7 and the transmitter or the conversion element 1 and the receiver can selectively be selected in response to the output of the oscillation pick up 11 through the use of this selection means. The oscillation pick up 11 of the transceiver is constituted with the case 12, support member 13 and the piezoelectric element 14 supporting one end with the member 13, the output signal is fed to the selective means 16 built in the transceiver 10 through the cord 15 to ensure the selection between transmission and reception state.</p> |
