To improve uniformity of density distribution in a matching member by filling hollow spheres having reduced electrostatic properties, without maldistribution in the matching member, consisting of a mixture of the hollow spheres and a binding material.
A matching member forming tool 5 is provided on a pedestal 3, an accommodating body 4 accommodating the hollow spheres 11, having reduced electrostatic charge performance, is mounted on this tool 5, the pedestal 3 is dropped to a receiving base 10 in this state to collide with the pedestal 3, and the filling rate of the hollow spheres 11 is improved by vibration generated this time. After that, the binding material 13 is mixed and hardened. In this way, since the hollow spheres 11 in the accommodating body 4 are filled without unevenness, the density of the matching member 18 becomes uniform, and using this as an acoustic matching layer 19 for an ultrasonic sensor improves the performance thereof.
ADACHI AKIHISA
OZAKI YUKINORI
SATO MASATO
Tomoyasu Sakaguchi
Hiroki Naito