Patent ID: 7675833
Filing Date: 2010-03-09
Classification: G11B

Abstract:
1. An optical pickup comprising: a first emission unit configured to emit a first wavelength beam; a second emission unit configured to emit a second wavelength beam; a third emission unit configured to emit a third wavelength beam; an objective lens configured to focus the first, second, and third wavelength beams emitted from the first, second, and third emission units, respectively, at a signal recording surface of an optical disk; a light-path combining unit configured to combine an optical path of the first wavelength beam emitted from the first emission unit and an optical path of the second and third wavelength beams emitted from the second and third emission units, respectively; and an aberration correcting unit provided on the optical path of the second and third wavelength beams; and a driving unit configured to displace the objective lens, the optical-path combining unit, and the aberration correcting unit in at least a focus direction.