Optical pickup and optical disc drive

Details Optical pickup and optical disc drive Optical pickup and optical disc drive

2007-12-28

2011-12-06

Lamb, Christopher R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

08072870

ABSTRACT:
The present invention provides an optical structure of an optical pickup for adjusting an exit light quantity of a light source, so as not to have adverse effect on reliability of semiconductor laser to be suited to the quantity of light. The exit light quantity of the light source is adjusted in consideration of a difference in reflectivity of optical discs used in recording or reproducing. With this configuration, when composing a compatible optical pickup for recording or reproducing BD and HD DVD by using light diffraction means of diffraction type, the reliability of semiconductor laser used as light source is enhanced with respect to diffraction efficiency.

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Kousei Sano et al., “Optical Pickup for Recording to Dual-Layer High-Speed Blu-Ray Disc”, Technical Digest of Optical Data Storage (ODS) Topical Meeting and Tabletop Exhibit, Optical Society of America (OSA), Portland, Oregon, 2007, pp. 1-3.
Toshiyasu Tanaka et al., “Optical Pickup for Recording to Dual-Layer 2X-Speed Blu-Ray Disc, DVD and Compact Disc”, Optical Data Storage, 2006, edited by Ryuichi Katayama, Tuviah E. Schlesigner Proc. of SPIE, vol. 6282 62822C-1-10.
Kousei Sano et al., “Novel One-Beam Tracking Detection Method for Dual-Layer Blu-Ray Discs”,Japanese Journal of Applied Physics, vol. 45, No. 2B, 2006, pp. 1174-1177.
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