| 摘要 |
PURPOSE:To shorten a response time, to improve an oscillation resistant property and to make the title instrument easy to read by driving a pointer by an ultrasonic motor. CONSTITUTION:An ultrasonic motor is used for the driving force of a meter. Since the ultrasonic motor obtains an output through frictional force, static holding torque is large and holding electrical power is unnecessary. Moreover, since recovering power is not used, the position of a rotor 3 is impossible to be changed by oscillation. When the instrument is constituted with a pointer 9 designed on the disc shaped rotor 3, it becomes storing to the oscillation essentially. When transparent glass disk is used for the pointer, that is, the rotor 3, also the tolerance of design is increased and the meter of which high- grade feeling is excellent is attained. |
