Optical pickup for an optical disc
AssigneePioneer Electronic Corporation
InventorHitoshi Furuhata
Life of this patent
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Abstract
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.
Claims2
An optical pickup for an optical disc, the pickup having a photodetector including a pair of detector elements disposed side by side, said optical pickup comprising:
- an astigmatizer disposed on an axis of a light beam reflected from the optical disc for producing an astigmatic beam;
- wherein the photodetector being positioned outside a point where a spot of the astigmatic beam becomes a circular shape, and wherein a boundary line, between the said pair of detector elements, is disposed on a line along which the spot moves during a tracking operation.
Dependencies are inferred from the claim text.