| 摘要 |
PURPOSE:To reduce the loss on apparatus by connecting a second vibrator with the node part of a first vibrator out of two sets of vibrators each composed of an elastic body and a piezoelectric body, by driving a moving body through the protrusion of said first vibrator, and by positioning said apparatus through the node part of said second vibrator. CONSTITUTION:A first vibrator 18 is formed by annular elastic body 16 and piezoelectric body 17, and radial primary and circumferential quaternary flexural oscillations are generated as a flexural oscillation mode. In said elastic body 16, a protrusion 19 is provided in the node part of vibration at the rate of one a wavelength of said flexural oscillation to drive a moving body 26 composed of an elastic body 25 and a friction material 24. A second vibrator 22 is formed by cylindrical elastic body 20 and piezoelectric body 21 to be vibrated in a longitudinal vibration mode. The first vibrator 18 and the second vibrator 22 are connected via the node part said first vibrator 18. The second vibrator 22 is vibrated simultaneously with the motion of the tip of said protrusion 19. A support plate 23 is brought into contact with the node part of said longitudinal vibration of the second vibrator 22 to position a motor. Thus, said motor with reduced loss and large output can be manufactured. |
