| 摘要 |
An optical-disc apparatus comprising: a laser-light source; an objective lens; an aberration-correction lens to be moved in an optical-axis direction according to a cover-layer thickness of an optical disc; a stepping motor; a driving unit to generate a driving pulse for the motor; a storage unit to store current-position information of the aberration-correction lens based on the number of the pulse; and a control unit to control the driving unit so that the aberration-correction lens is moved between a first position set in a mechanical-movable range of the aberration-correction lens and a second position set on the objective-lens side relative to the first position, the driving unit being controlled so that the aberration-correction lens is moved to the second position when stop of disc rotation occurs, and is moved to a start position between the first-and-second positions according to the thickness based on the information when the stop is cancelled.
|
