| 摘要 |
PROBLEM TO BE SOLVED: To reconcile a low acoustic impedance value applicable to an aerial radiation ultrasonic wave transducer with the mechanical strength and durability, in an acoustic matching member obtained by integrating two or more layers of acoustic matching members having different acoustic impedances in order to improve the sensibility of an ultrasonic wave transducer.SOLUTION: The acoustic matching member of the present invention transmits and discharges ultrasonic wave. The acoustic matching member includes: at least a first matching layer 11 mainly made of glass; and a second matching layer 12 that is integrally bonded to the first matching layer 11 and is mainly made of glass. The first matching layer 11 and second matching layer 12 have a plurality of pores inside them. The volume of the pores per unit volume of the second matching layer 12 is larger than the volume of the pores per unit volume of the first matching layer 11. |
