| 摘要 |
PURPOSE:To increase the sensitivity of reception and to withstand long time use at high temperatures, by forming a bonding layer between a metallic box and an acousic conversion piezoelectric element with Ag and Li. CONSTITUTION:An acoustic conversion piezoelectric element 3 is provided in a transmission and reception wave section 2 in a metallic box 1. The section 2 and the element 3 are incorporated with a bonding layer 4. An AC voltage is given to the element 3 and the section 2 through a metallic film cable 8 and a core 7 via a conductor 6 and an electrode 5. In the acoustic transducer with this constitution, the bonding layer 4 is formed with Ag and Li. As a result, in the baking for the purpose of bonding between the section 2 and the element 3, no Li is segregated, the sensitivity of reception is increased and the durability for a long time at high temperature is obtained. |
