Patent ID: 7813234
Filing Date: 2010-10-12
Classification: G11B

Abstract:
1. An optical pickup, comprising: a plurality of light sources emitting light beams having different wavelengths; a spherical aberration correcting portion for correcting spherical aberration by adjusting convergence/divergence states of the light beams emitted from the light sources; a reflecting portion having: two objective lenses that are selectively used according to whether the light beams emitted from the light sources are reflected from the first surface or from the second surface so as to condense light reflected from the reflecting portion onto a recording layer of an optical disc, wherein the first surface and the second surface are formed substantially parallel with each other, the reflecting portion is disposed between the spherical aberration correcting portion and the objective lenses, and an astigmatism correcting portion that is formed such that an amount of correction can be changed is further disposed between the spherical aberration correcting portion and the objective lenses.