Patent ID: 7957234
Filing Date: 2011-06-07
Classification: G11B

Abstract:
1. An optical pickup apparatus comprising: a laser diode; an objective lens configured to focus laser light emitted from the laser diode on multiple signal recording layers of an optical disc; a first aberration correction element arranged in an optical path between the laser diode and the objective lens; and a second aberration correction element arranged in the optical path between the laser diode and the objective lens and having an aberration correction speed lower than the aberration correction speed of the first aberration correction element, the first aberration correction element and the second aberration correction element being selectively operated according to the required aberration correction speed, the first aberration correction element operating so as to correct aberration, when jumping between one of the signal recording layers and another of the signal recording layer of the optical disc, the second aberration correction element operating so as to correct aberration, when reading a signal from one of the signal recording layers of the optical disc.