Objective lens apparatus, optical pickup apparatus, and...

Details Objective lens apparatus, optical pickup apparatus, and... Objective lens apparatus, optical pickup apparatus, and...

2007-04-26

2010-12-07

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112010

Reexamination Certificate

active

07848211

ABSTRACT:
An objective lens apparatus is disclosed. The apparatus includes: a first objective lens with a first numerical aperture, which is capable of focusing a laser light on a first optical record medium with a first cover layer of a first thickness; a second objective lens with a second numerical aperture smaller than the first numerical aperture, which is capable of focusing the laser light on a second optical record medium with a second cover layer of a second thickness larger than the first thickness; a third objective lens with a third numerical aperture smaller than the second numerical aperture, which is capable of focusing the laser light on a third optical record medium with a third cover layer of a third thickness larger than the second thickness; and a lens holder which holds the first objective lens, the second objective lens, and the third objective lens.

REFERENCES:
patent: 2002/0048248 (2002-04-01), Nakao
patent: 2004/0114495 (2004-06-01), Kim et al.
patent: 2005-293770 (2005-10-01), None
patent: 2005-302163 (2005-10-01), None

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