PURPOSE: To make a packing layer thin and the size of an ultrasonic oscillator compact by forming the packing layer connected and disposed in a rear surface of a piezoelectric body in a laminating structure of a rubber layer and a sponge layer.
CONSTITUTION: In a rear surface of a piezoelectric body 1 having electrode layers 11, 12 are formed on a front and a back surfaces, a packing layer 2 on which a rubber layer 21 and a sponge layer 22 are laminated is connected and disposed. As for the sponge layer 22, a sponge of a similar rubber to the rubber layer 21 is used and an ultrasonic reflection in an interface is reduced. Thereby, a strength of the packing layer 2 and an absorptivity of the ultrasonic wave can be improved by the sponge layer 22 and the rubber layer 21, so that the packing layer can be thinned and the ultrasonic oscillator can be made compact.
TERAMOTO HIROSHI
NAKATSUKA NOBUO
KATO MITSUTAKA
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