Objective lens

Details Objective lens Objective lens

2011-04-12

2011-04-12

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

Reexamination Certificate

active

07924685

ABSTRACT:
An object of the invention is to provide a plastic objective lens having a good lens tilt property in both thicknesses of a two-layer disc in a used temperature range even in the plastic objective lens in which a numerical aperture (NA) is equal to or higher than 0.81, while dissolving the problem mentioned above. The objective lens includes a point at which a third order comma aberration amount generated at a time of a lens tilt of the objective lens becomes equal to a third order comma aberration amount generated at a time when a disc is tilted at the same angle amount as the lens tilt angle, in a transparent board thickness which is thicker than a larger thickness of the two-layer transparent board under a room temperature (25±3° C.).

REFERENCES:
patent: 6807018 (2004-10-01), Maruyama et al.
patent: 7508596 (2009-03-01), Saito
patent: 2002/0186476 (2002-12-01), Sasano et al.
patent: 2006/0198254 (2006-09-01), Hirai et al.
patent: 2007/0104045 (2007-05-01), Nagura
patent: A-2008-4169 (2008-01-01), None

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