Invention Grant
US5920528A Optical disc apparatus and method of tracking control of optical disc apparatus 失效
光盘装置及跟踪光盘装置的控制方法

Optical disc apparatus and method of tracking control of optical disc
apparatus
Abstract:
An optical disc apparatus for recording and/or reproducing with respect to an optical disc, comprises a light source for emitting a laser beam; an object lens for focusing the laser beam toward the optical disc; a supporting device which supports the object lens; a sled portion which holds this supporting device; a transporting means for moving the sled portion in the radial direction of the optical disc; a center point servo control means for detecting the movement of the object lens and moving the supporting device so that the object lens is maintained at a predetermined position; a tracking servo control means for generating a tracking error signal and moving the supporting device, so that the object lens is held on the desired track of the optical disc; a frequency detecting means for detecting the frequency of the tracking error signal; and a servo control selecting means for selectively selecting the center point servo control means or the tracking servo control means based on the frequency.
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