| 摘要 |
PURPOSE:To make it possible to reduce a original oscillation frequency by making a driving circuit which has the same effect as it is driven at a middle frequency of the minumum variation range of a driving frequency which is changed by changing a counting value of a counter for dividing by +/-1 every one cycle of the driving frequency. CONSTITUTION:A reverse cycle of an output of a D flip-flop 17 is so set as it repeats becoming longer or shorter by one cycle of oscillation of an oscillating circuit 1 every cycle. An oscillatory wave motor 26 is so structured as to be driven by a signal which changes its frequency every cycle. Since the oscillatory wave motor 26 has a response speed very much slower than the driving frequency, it rotates in the same condition as it is driven at a middle frequency between the two frequencies which vary every cycle. Even if a variation of the oscillatory wave motor 26 driving frequency is large, the same effect as the motor is driven at a middle frequency is obtained and therefore an original oscillation frequency can be made low. |
