Patent ID: 8295146

Claim:
An extraction optical system for use in an optical pick-up device receiving a reflected light from an optical disc having a plurality of recording layers, the system extracting from a light in which a signal light component from an access target recording layer of the plurality of recording layers and a stray light component from a recording layer other than the access target recording layer of the plurality of recording layers are mixed, the signal light component from the access target recording layer of the plurality of recording layers, the system comprising: a condensing optical element arranged in an optical path of the reflected light and condensing the reflected light; and a selective optical system to which the reflected light condensed by the condensing optical element is incident and reflecting a light primarily containing the signal light component, the selective optical system comprising a reflective plate and a support member supporting the reflective plate, said condensing optical element focusing the reflected light on the reflective plate in the selective optical system, said reflective plate reflecting a center portion of the light primarily containing the signal light component, and wherein said support member either allows the stray light component to pass through or attenuates the stray light component, and wherein said reflective plate is more reflective than said support member, and wherein the support member is a transparent member arranged on the condensing optical element side of the reflective plate.