Invention Grant
US08509042B2 Optical disc apparatus, focus control method and integrated circuit 有权
光盘装置,聚焦控制方法及集成电路

Optical disc apparatus, focus control method and integrated circuit
Abstract:
An optical disc apparatus has: a spherical aberration correction unit (7) which corrects the spherical aberration generated in a light spot on a recording layer; a control unit (52) which focuses a light beam on a predetermined recording layer, and shifts the focal point position of the light beam from the current recording layer to another recording layer; and a focus jump control unit (60) which controls correction of spherical aberration and shift of the focal point position based on the interlayer distance between the current recording layer and a recording layer which adjoins in a direction opposite to a direction of shifting the focal point position of the light beam. By this configuration, focus jump is stably executed.
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