| 摘要 |
<p>A positioning system having a velocity feedback loop for positioning an object is described in which numerical operation is employed. The positioning system generally has two modes -- a high speed moving mode and a fine moving mode. The system requires a wide range in the high speed moving mode and a high resolution in the fine moving mode. To satisfy these inconsistent requirements, the gain of a velocity sensor in the feedback loop is varied according to the mode. The gain is decreased in the high speed moving mode, and increased in the fine moving mode. This system is effectively used to control an optical head of an optical disc player.</p> |
