MULTI-CHANNEL OPTICAL PICKUP AND OPTICAL RECORDING/REPRODUCING APPARATUS EMPLOYING THE SAME

摘要

A multi-channel optical pick-up and a multi-channel optical recording and/or reproducing apparatus employing the same, the multi-channel optical pick-up including: a plurality of light sources including a center light source closest to an optical axis from among the plurality of light sources and at least one off-axis light source farther than the center light source to the optical axis; an objective lens to condense a plurality of light beams respectively emitted from the plurality light sources onto a plurality of tracks of an information storage medium; and an optical path length changing element to compensate for defocus that occurs due to the at least one off-axis light source distanced from the optical axis when a center light beam from the center light source and at least one off-axis light beam from the at least one off-axis light source form spots on the information storage medium.