Method and apparatus for measuring off-track detection...

Details Method and apparatus for measuring off-track detection... Method and apparatus for measuring off-track detection...

2004-01-30

2009-11-24

Wellington, Andrea L (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053230

Reexamination Certificate

active

07623419

ABSTRACT:
An off-track duty measurement unit measures off-track detection sensitivity on the basis of an off-track signal, and track cross cycle information that is obtained from a tracking error signal measured by a track cross cycle measurement unit, whereby off-track detection sensitivity can be measured more accurately. Further, an off-track detection sensitivity controller changes the detection sensitivity of an off-track signal detector according to the obtained off-track detection sensitivity, whereby the off-track sensitivity can be kept constant for various kinds of discs, and accordingly, stabilities of off-track detection, track pull-in judgement, and track jumping can be secured.

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Japanese Office action dated Mar. 17, 2009 from Japanese Application No. 2002-021638 (4 pages).

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