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

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

2006-09-19

2006-09-19

Tran, Thang V. (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

07110344

ABSTRACT:
An objective lens for recording and/or reproducing information of an optical information recording medium, comprises at lest one aspherical surface. The objective lens is a single lens and satisfies the following formulas:in-line-formulae description="In-line Formulae" end="lead"?0.85<NA<0.98in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.80<d/f<3.00in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.5<Φ1<5.8in-line-formulae description="In-line Formulae" end="tail"?whereNA is an optical information recording medium side numerical aperture,d is a thickness (mm) on an optical axis,f is a focal length (mm) for an object locating at an infinite distance, andΦ1 is an effective diameter (mm) of a light source side surface.

REFERENCES:
patent: 6411442 (2002-06-01), Ota et al.
patent: 6511788 (2003-01-01), Yasuda et al.
patent: 6633533 (2003-10-01), Kondo

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