| 摘要 |
PROBLEM TO BE SOLVED: To control the scanning condition of an electromagnetic drive type optical scanner at a desired condition on the basis of the detected result by one photosensor even when overshooting of a scanning section occurs. SOLUTION: When the photosensor is located at a position deviated from the scanning center O, a time interval between the time when the beam is detected with the photosensor and the time when the beam is detected at the next time alternately becomes short time intervals T11 and T21 and long time intervals T12 and T22 in one reciprocal motion. Further, the combination of the time intervals varies according to the amplitude. Namely, the shorter time interval in one reciprocal motion becomes longer as the amplitude is larger, and the longer time intervals, on the contrary, becomes shorter as the amplitude is larger. The system of this invention is so controlled by making use of this characteristic as to make the amplitude smaller when the time interval is longer than the set interval corresponding to a predetermined scanning condition, and to make the amplitude large in the opposite situation. COPYRIGHT: (C)2004,JPO&NCIPI
|
