| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a galvano-driving apparatus where abnormal turning of a galvanomirror due to an abnormal oscillation, or the like, is optimally suppressed. <P>SOLUTION: The galvano-driving apparatus 20 comprises a galvanomirror 10; a driving means 14 which turns the galvanomirror; an angle detection means 15 which detects the turning angle of the galvanomirror; an abnormal turning detection means 36 which detects the abnormal turning of the galvanomirror; a control means 34 which, when an abnormal turning is detected, generates a suppression signal Sc which suppresses the abnormal turning of the galvanomirror for a prescribed time; and a voltage-dividing circuit (angle range variation means) 37 which varies the setting of the range of the turning angle. The voltage-dividing circuit varies the angle range from a normal angle range to the auxiliary angle range which is narrower, according to the detection of the abnormal turning. The control means generates the suppression signal Sc, when overrunning of the turning angle is detected from the auxiliary angle range. The voltage-dividing circuit returns the turning angle from the auxiliary angle range to the normal angle range, when overrunning from the auxiliary angle range is not detected again, from the last detection of overrun in a prescribed reference period. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
