Optical pickup including unit to remove crosstalk in multi-layered disk, and optical recording and/or reproducing apparatus including the optical pickup

摘要

A unit (113,120,130,140) to remove crosstalk in a multi-layered disk (D), an optical pickup (200) including the unit (113,120,130,140), and an optical recording and/or reproducing apparatus including the optical pickup (200), of which the optical pickup includes (200): a light source (100); an optical path changer to change the path of light emitted from the light source; a unit to remove crosstalk (113,120,130,140); an objective lens (115) to focus incident light on a disk (D); and a photodetector (125) detecting light reflected by the disk (D) such that the unit to remove crosstalk (113,120,130,140) separates light reflected by a target recording layer (L t ) of the disk from light reflected by adjacent recording layers (L n ,L p ) so that the light reflected by the target recording layer (L t ) and the light reflected by the adjacent recording layers (L n ,L p ) do not overlap on the photodetector (125), by blocking the central portion of the beam (L to ,L po ).