OPTICAL PICKUP DEVICE

摘要

Provided is an optical pickup device which reads information signals recorded along a track on a recording surface of an optical disc by optical beam irradiation. The optical pickup device is provided with an objective lens for collecting the optical beam on the recording surface; an objective lens moving means for moving the objective lens in the radial direction of the optical disc; and a light dividing/receiving means which receives light by dividing the returning light reflected by the optical disc into a plurality of regions. The light dividing/receiving means is composed of a first light dividing/receiving means, which receives light by dividing a first region, which includes the both end portions of the returning light in the radial direction, into two in the radial direction; a second light dividing/receiving means, which receives light by dividing a second region, which includes the both end portions in a direction orthogonally intersecting with the radial direction of the returning light, into two in the radial direction; and a third light dividing/receiving means, which receives light by dividing a third region, which includes substantially the center portion of the returning light, into two in the radial direction.