APPARATUS FOR SENSING DEFECT OF OPTICAL DISK

摘要

A defect-sensing apparatus which can accurately sense dust or a defect on an optical disk even when the emitting power of a laser light source is changed. The apparatus comprises a defect-sensing unit (102) which senses a defect or the like on an optical disk (101) using a reflected light, and a power adjusting unit (104) which adjusts the emitting power of a laser light source (100) to an optimum value. The defect-sensing unit (102) can accurately sense a defect or the like on the optical disk (101) even when the laser power is changed by comparing the threshold value which is determined according to the power adjusted by the power adjusting unit (104) with the value corresponding to the reflected light.