Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1994-12-27
1996-09-24
Psitos, Aristotelis
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369112, G11B 712
Patent
active
055597670
ABSTRACT:
An optical composite unit is provided to receive a light focused by a focusing lens for receiving a light reflected from an optical disc. The optical composite unit comprises a cylindrical lens and side-wedge prisms or side-cylindrical lenses which are provided on both sides of the cylindrical lens. The cylindrical lens has a height including a diameter of the focused light and a width narrower than the diameter, and an axis which is rotated by 45.degree. relative to a long axis of a cylindrical beam formed by the cylindrical lens. The side-wedge prisms or side-cylindrical lenses form side beams separated from the cylindrical beam. The cylindrical beam is for detecting a focus error, and the side beams are for detecting a tracking error.
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NEC Corporation
Psitos Aristotelis
Wilkinson Duncan
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