Optical pickup apparatus, objective optical element and...

Details Optical pickup apparatus, objective optical element and... Optical pickup apparatus, objective optical element and...

2007-07-11

2008-11-18

Feild, Joseph (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

07453786

ABSTRACT:
An optical pickup apparatus comprises: a first light source; a second light source; a third light source; and an objective optical element. The objective optical element comprises at least two areas comprising first and second optical path difference providing structures. A third light flux from the third light source passing the first optical path difference providing structure forms first and second best focuses. The third light flux passing the objective optical element forms a spot comprising a central spot portion; an intermediate spot portion; and a peripheral spot portion. The central spot portion is used for recording and/or reproducing information for a third optical disk, and the intermediate and peripheral spot portions are not used for recording and/or reproducing information for the third optical disk. The peripheral spot portion is formed on the third optical disk by the third light flux through the second optical path difference providing structure.

REFERENCES:
patent: 6191889 (2001-02-01), Maruyama
patent: 6366542 (2002-04-01), Kojima et al.
patent: 6515955 (2003-02-01), Takeuchi
patent: 6665130 (2003-12-01), Kimura
patent: 6728042 (2004-04-01), Ota et al.
patent: 7050236 (2006-05-01), Ikenaka
patent: 1 304 689 (2003-04-01), None

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