Laser detector grating unit (LDGU) for producing focus error, a

Details Laser detector grating unit (LDGU) for producing focus error, a Laser detector grating unit (LDGU) for producing focus error, a

1997-06-24

1999-01-05

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, 369112, G11B 7085

Patent

active

058569618

ABSTRACT:
An apparatus for providing a focus error signal, a push-pull tracking error signal, and a differential phase tracking error signal for controlling an application of a radiation beam from an optical source to a data track of an optical storage medium is disclosed. The apparatus includes a transparent substrate arranged between said optical source and said optical storage medium such that said radiation beam passes through said substrate; a grating beam splitter supported by said transparent substrate and having at least six grating elements. The arrangement of the grating elements being selected to produce signals which are particularly adapted to produce signals which are received by a detector array. The detector array responds to these signals to produce the focus error signal and responsive to signals from the first, second, fifth, and sixth detectors to produce the push-pull tracking error signal, and a differential phase tracking error signal.

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pp. 172-179 of A. Marchant, "Optical Recording: A Technical Overview," Addison-Wesley, Reading, Mass.

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