Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

2007-02-12

2010-02-16

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112230

Reexamination Certificate

active

07664005

ABSTRACT:
The adverse influence of reflected light from adjacent layers as stray light on a control signal or data signal is reduced when tracking a multilayered optical disc using differential push-pull method. The reflected light from the optical disc including stray light from an adjacent layer is once condensed with a condenser lens having little aberration and is then reflected by a reflecting mirror having a partial reflecting region. The resultant reflected light, which has the influence of stray light reduced, passes through a polarization beam splitter and becomes incident on a four-quadrant detector (for main beam) and a split detector (for sub beam) via a condenser lens having astigmatic aberration.

REFERENCES:
patent: 5790501 (1998-08-01), Kase et al.
patent: 2002-367211 (2002-12-01), None
patent: 2005-302084 (2005-10-01), None
Noriyoshi Shida, et al.; Superlarge-Capacity Optical Disk with Multilayer Structure Fabricated Using a Photopolymer Sheet; Jpn. J. Appl. Phys.; Part 1, No. 2B, Feb. 2003; vol. 42; pp. 778-783.

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