VIBRATING BODY DRIVEN IN SHAFT DIRECTION

摘要

PROBLEM TO BE SOLVED: To constitute a portable vibrating body which is small and has high performance. SOLUTION: A pair of brackets 14 and 15 are fitted onto the outer ends of a cylindrical frame 11 in its shaft direction to hold both ends of a fixed shaft 19. A cylindrical coil 12 having terminals 32 and 33 is fixed on the inner peripheral surface of the frame 11. A driving element 30 having bearings 17 and 18 which are arranged at the outer ends of a cylindrical permanent magnet 16 that are magnetized to a same polarity along its radial direction, is supported in a freely movable manner along the shaft direction of the shaft 19. Employing the coil springs 23 and 24 arranged between the brackets 14 and 15, the element 30 is constituted to have a first resonant frequency of 100 to 150 Hz.