Optical pickup tracking controller and optical pickup...

Details Optical pickup tracking controller and optical pickup... Optical pickup tracking controller and optical pickup...

2007-08-14

2007-08-14

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053230

Reexamination Certificate

active

10872412

ABSTRACT:
In a tracking controller for an optical pickup, a photodetector having four light reception parts receives return light from an optical disc and outputs light detection electric signals. Predetermined addition and subtraction operations are performed on the light detection electric signals from the light reception parts. A phase comparator compares phases and outputs a pseudo radial contrast signal. Bringing into tracking servo control is performed based on the pseudo radial contrast signal.

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patent: 59153320 (1984-09-01), None

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