| 摘要 |
PURPOSE:To easily form a sound matching layer whose acoustic impednace is gradually changed with good reproducibility by forming the multilayer structure of a matching member by a heavy metal layer and a plastic layer and changing sequentially the occupancy ratio of the both. CONSTITUTION:The acoustic matching member 2 is constituted by laminating lots of layers 21, 22-2n sufficiently thinner than a 1/4 wavelength. Each layer is laminated by the adhesion or heat adhesion being the conventional method. The occupancy ratio of the heavy metal 52 to the plastic film layer 51 is constituted to be large sequentially from one end in contact with a body 4 to be checked toward the other end in contact with an ultrasonic wave vibrator 1. The layer 2n in contact with the body 4 to be checked is constituted by a plastic film layer 51 only.
|
