Optical disc device, method for activating optical disc...

Details Optical disc device, method for activating optical disc... Optical disc device, method for activating optical disc...

2011-05-24

2011-05-24

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053280, C369S112240

Reexamination Certificate

active

07948835

ABSTRACT:
An optical disc device includes: a light source; a condensing system including a solid immersion lens for emitting light from the light source onto an optical disc; a gap control circuit for setting a distance between the solid immersion lens and the optical disc to a constant value; a CPU for adjusting a condensing position of emission light from the solid immersion lens with respect to an information recording/reproducing surface of the optical disc by moving a concave lens in a direction of an optical axis; and a focus control circuit for setting the condensing position on the information recording/reproducing surface, while following plane displacement of the information recording/reproducing surface, using a focus error signal. The CPU is operable to correct coma aberration in focus position adjustment by moving the concave lens in a direction perpendicularly intersecting with the optical axis.

REFERENCES:
patent: 7042826 (2006-05-01), Matsui
patent: 2002-157750 (2002-05-01), None

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