Patent ID: 7301861
Filing Date: 2007-11-27
Classification: G02B,G11B

Abstract:
1. A coma aberration correcting apparatus of an optical pickup including an optical pickup main body having a photo diode, and an actuator mounted on an objective lens focusing a beam emitted from the photo diode onto a recording medium, the coma aberration correcting apparatus comprising: a main supporting unit detachably supporting the optical pickup main body; a holding unit holding and releasing the actuator on the optical pickup main body supported by the main supporting unit; an optical system magnifying and photographing the beam emitted from the photo diode through the objective lens of the actuator held by the holding unit; a driving part adjusting a position of the actuator relative to the optical pickup main body; and a controller controlling the driving part to correct the coma aberration of the objective lens by calculating a coma aberration value based on a centroid difference between beam images having minimum coma aberration and a beam image having some coma aberration, where the beam images having the minimum coma aberration and the beam image having some coma aberration are captured by the optical system, and determining whether the actuator passes inspection by comparing the calculated coma aberration value with a predetermined reference value.