Optical pickup for an optical disc

摘要

An optical pickup is adapted to be operated in accordance with a tracking error signal obtained by a push-pull method. The pickup has a photodetector including a pair of detector elements disposed side by side. An astigmatizer is disposed on an axis of a light beam reflected from an optical disc for producing an astigmatic beam. The photodetector is positioned outside a point where a spot of the astigmatic beam becomes a circular shape, and a boundary line between the two detector elements is disposed on a line along which the spot moves in a tracking operation.