Optical pickup device

Details Optical pickup device Optical pickup device

2009-10-29

2011-12-20

Lamb, Christopher R (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044230, C369S044410

Reexamination Certificate

active

08081550

ABSTRACT:
In a multilayer disc has an increased number of recording layers) spaced by spacing from each other, a generation interval between focus error (FE) signals detected from the respective recording layers becomes small. This causes mutual interference between the FE signals and a resulting undesired offset and the like in the signals, leading to a significantly deteriorated quality of the FE signals. To avoid this, in an optical pickup device according to the present invention, detection surfaces are newly added at positions adjacent to the FE signal detection surfaces, a predetermined detection signal obtained from the newly-added detection surfaces is multiplied by a predetermined coefficient value depending on the spacing between the recording layers, and the multiplied signal is subtracted from the original FE signal. As a result, mutual interference between the FE signals can be remarkably reduced.

REFERENCES:
patent: 6339562 (2002-01-01), Sakai
patent: 2009/0257340 (2009-10-01), Nagata et al.
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patent: 2007-287232 (2007-11-01), None
patent: 2007-335047 (2007-12-01), None
patent: WO 2006/067674 (2006-06-01), None
patent: WO 2007/043663 (2007-04-01), None

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