Optical pickup device and optical recording medium...

Details Optical pickup device and optical recording medium... Optical pickup device and optical recording medium...

2011-06-21

2011-06-21

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112050, C369S112070, C369S044370

Reexamination Certificate

active

07965609

ABSTRACT:
The present invention provides an optical pickup device and optical recording medium information reproduction device that are capable of reproducing information that is recorded on a plurality of kinds of optical discs having different track pitches. With the present invention, an optical pickup device generates a main beam and sub beams that are made up from pairs of semi sub beams, such that the distance in the radial direction between center positions of a pair of semi sub spots on an optical disc where a pair of semi sub beams are formed is an odd multiple of half the track pitch of the optical disc, and the distance in the radial direction between center positions of semi sub spots that correspond to another pair of sub semi sub beams is an odd multiple of half the track pitch of another optical disc.

REFERENCES:
patent: 2005/0128896 (2005-06-01), Katayama
patent: 2008/0253263 (2008-10-01), Komma
patent: 2004-5859 (2004-01-01), None
patent: 2004-318958 (2004-11-01), None
patent: 2004318958 (2004-11-01), None

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