Patent ID: 7289417
Filing Date: 2007-10-30
Classification: G11B

Abstract:
1. An optical pickup comprising: a first objective lens to form an optical spot of a light beam used to record and/or reproduce data on a first recording medium; a second objective lens to form an optical spot of a light beam used to record and/or reproduce data on a second recording medium; a first light source emit a light beam having a wavelength suitable for the high-density recording medium; and at least one second light source to emit a light beam with a wavelength suitable for the low-density recording medium, wherein the first objective lens has a working distance WD wherein at least one of the plurality of objective lenses is configured so that a type of wavefront error mainly generated by a tilt of the at least one of the plurality of objective lenses is the same as a type of a wavefront error mainly generated by an angle at which light is incident upon the at least one of the plurality of objective lenses.