| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem of an aquarium that shapes of a model ship and a model fish are enlarged for the necessity of batteries for driving motors, the connection for driving a screw and a caudal fin requires fine work, the costs for the model ship and the model fish become expensive and the cost of the aquarium becomes expensive. SOLUTION: A transparent tank 1 is filled with liquid 2, an ultrasonic oscillating element 3 is mounted on the bottom of the transparent tank 1, an oscillation output is impressed on the ultrasonic oscillating element 3 from an oscillator 4 incorporating the battery, the ultrasonic oscillating element 3 thus emits the ultrasonic wave in the liquid 2 of the transparent tank 1 and the model fish 5 floats in the liquid 2. A bimorph oscillating element 8 which has piezoelectric ceramics 7 fixed to the both surfaces of a metal plate is constituted, a propulsion plate 9 is fixed to one end of the metal plate 6 of the bimorph oscillating element 8 and the bimorph oscillating elements 8 are fixed to the sides of the model fish 5. COPYRIGHT: (C)2005,JPO&NCIPI
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