Gap controller and optical information processor

Details Gap controller and optical information processor Gap controller and optical information processor

2011-06-07

2011-06-07

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112230, C369S013330

Reexamination Certificate

active

07957232

ABSTRACT:
A gap controller according to the present invention can set a reference level reasonably for a gap control that needs to be done to keep the gap between a solid immersion lens (SIL) and an optical disc constant. With the gap varied at a substantially regular step, gap detection signal levels are logged to find an extreme value of its second-order difference. And the gap control reference level is determined by the gap detection signal level that results in that extreme value.

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patent: 2007/0286031 (2007-12-01), Matsumoto
patent: 2009/0154309 (2009-06-01), Jeong et al.
patent: 2002-319160 (2002-10-01), None

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