METHOD AND DEVICE FOR MEASURING INCLINATION OF OBJECTIVE LENS FOR OPTICAL PICKUP

PROBLEM TO BE SOLVED: To provide a method and a device for measuring an inclination of an objective lens for an optical pickup, with which inclinations of a plurality of objective lenses corresponding to a plurality of optical disks are measured with high accuracy, with high efficiency and at a low cost. SOLUTION: The inclinations of the plurality of objective lenses are measured by placing a correction plate having optical characteristics corresponding to the optical disk on a place on which the plurality of optical disks are to be placed, ejecting a laser beam corresponding to the optical disk from a laser beam ejecting section, reflecting the laser beam having passed through the objective lens and the correction plate with a spherical mirror, moving the spherical mirror in such a way that the laser beam and a spot image of the laser beam reflected with the spherical mirror are formed on the correction plate, forming the image of the laser beam reflected with the spherical mirror on a beam detecting section, and measuring a coma of the spot image from a result of detection of the beam detecting section. COPYRIGHT: (C)2010,JPO&INPIT