| 摘要 |
<p>An optical disc device including: a light source (101); an object lens (107) to focus light emitted from the light source (101) on an information recording surface of an optical disc; a movable lens (105) that is arranged on an optical path between the light source (101) and the objective lens and arranged such that position thereof is adjustable along a direction of a light axis; a lens moving portion (30) to move the movable lens (105) along the direction of the light axis; a tracking servo system which makes a beam spot that is formed of the light from the light source (101) through focusing by the objective lens keep on track of the optical disc; and a control part (171) which controls gain of a servo loop of the tracking servo system is made temporarily larger when the movable lens (105) is moved by the lens moving portion (30) in comparison with a case where moving of the movable lens (105) by the lens moving portion (30) is not performed. The disturbance of the tracking servo control by vibration when the lens is moved to correct spherical aberration is thereby reduced.
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