Optical pickup device and recording and/or reproducing...

Details Optical pickup device and recording and/or reproducing... Optical pickup device and recording and/or reproducing...

2006-08-15

2008-10-21

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S013330, C369S044110, C369S044230

Reexamination Certificate

active

07440383

ABSTRACT:
An optical pickup device includes an objective lens (2), with a numerical aperture (NA) being not less than 1, having a solid immersion lens (1) which is made up by a spherical portion (1a) and a flat portion (1b) parallel to a surface (101a) of an optical disc (101). The component of the reflected light from the optical disc in the polarized state perpendicular to the polarized state of the reflected light which prevails when the distance between the surface of the optical disc and the flat portion of the solid immersion lens is zero is detected. The so detected light intensity is associated with the distance between the optical disc surface and the solid immersion lens to accurately detect the minute gap between the optical disc and the solid immersion lens.

REFERENCES:
patent: 6717896 (2004-04-01), Imanishi
patent: 6791913 (2004-09-01), Ishimoto
patent: 6845066 (2005-01-01), Shingo
patent: 7106683 (2006-09-01), Saito et al.
patent: 2001/0053117 (2001-12-01), Ichimura et al.
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patent: WO 99/41566 (1999-08-01), None
U.S. Appl. No. 11/504,066, filed Aug. 15, 2006, Saito et al.
Tsutomu Ishimoto, et al., “Near field readout system for a high density optical ROM disc”, Proceedings of SPIE, vol. 4342, XP-002407621, Jan. 2002, pp. 294-303.

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