OSCILLATION CONTROL DEVICE FOR ROCKER

摘要

PROBLEM TO BE SOLVED: To provide an oscillation control device for a rocker which achieves cost reduction and materializes desired oscillation without requiring complicated labor. SOLUTION: A sensor part 14 is provided with a reflector 141 which is arranged in an oscillator and has a reflection-transmission pattern part 1411 over a predetermined range of substantially half in the rocking direction of the rocker, and one optical sensor 142 for outputting a pulse signal S142 in response to a light receiving level by receiving light reflected by the reflector 141. A control circuit 15 counts the continuous time when no waveform is produced and the change point on the basis of a pulse signal waveform by the optical sensor. The rocking amplitude is recognized through the count of a pulse signal for one period. When the time at which no waveform is produced continues for a prescribed time, the recognition of an off-time is made to determine the completion of one period. The circuit starts driving from next pulse. At the time of stopping rocking, fade-out control is executed in which the rocking amplitude is gradually lowered to be stopped in accordance with the degree of rocking amplitude to be set. COPYRIGHT: (C)2007,JPO&INPIT