| 摘要 |
PURPOSE:To provide an ultrasonic motor in which the rotation can be detected with high resolution without projecting the ultrasonic motor to the outside of the case. CONSTITUTION:A drive module 1 is brought into external contact with a rotary drum 2 to cause rotary driving. A disc 3 is disposed integrally with the rotary drum 2 and a frictional disc 4 is pressed against the outer radial part thereof. The disc 3 has a diameter smaller than the height of the drive module 1 and a plurality of substantially conical protrusions 4a and recesses 3a are provided at the frictional transmission parts of both discs in order to prevent slip through mating. A rotation detector is linked with the frictional disc 4 and integrally fitted in a case 6. |
