OPTICAL RECORDING/REPRODUCING DEVICE AND MEDIUM JUDGING METHOD

摘要

Provided is a recording/reproducing device capable of highly accurately judging the type of an optical recording medium such as an optical disc while correcting a wavefront aberration. The recording/reproducing device includes: a detector for successively detecting a surface of a cover layer of a body to be detected and one or more signal recording planes according to a photo detector output signal; a medium judging unit for identifying the type of the body to be detected according to the detection result; an aberration correction element; and an aberration control unit for controlling the aberration correction state of the aberration correction element. When a light collecting point of the optical beam moves toward the signal recording surface, the aberration control unit sets an aberration correction state of the aberration correction element to a state between a first aberration correction state for appropriately correcting the wavefront aberration in accordance with the surface of the cover layer of a predetermined optical recording medium and a second aberration correction state for appropriately correcting the wavefront aberration in accordance with the signal recording surface of the predetermined optical recording medium.