Patent ID: 6498330
Filing Date: 2002-12-24
Classification: B82Y,G02B,G11B

Abstract:
A recording/reproducing device comprising:an optical pickup comprising: a light source, a light-gathering optical system for gathering light, which is emitted from the light source, on a recording medium, detecting means for detecting a spherical aberration of the light-gathering optical system in accordance with two focus positions of a first light beam passing through the light-gathering optical system in an area adjacent an optical axis and a second light beam passing outside the first light beam, among light beams passing through the light-gathering optical system; aberration correcting means for correcting the spherical aberration of the light-gathering optical system in accordance with an output of the detecting means; and an aberration information recording means for recording spherical aberration information in a predetermined area of said recording medium after said detecting means detects a spherical aberration of said light-gathering optical system.