Objective lens, light converging optical system, optical...

Details Objective lens, light converging optical system, optical... Objective lens, light converging optical system, optical...

2005-09-27

2005-09-27

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112230

Reexamination Certificate

active

06950383

ABSTRACT:
An objective lens for recording and/or reproducing information of an optical information recording medium, is a single lens having an aspherical surface on at least one surface. The objective lens is a finite conjugate type to converge a divergent light flux from a light source onto an information recording plane of the optical information recording medium and satisfies the following formula:in-line-formulae description="In-line Formulae" end="lead"?NA≧0.7in-line-formulae description="In-line Formulae" end="tail"?where NA is an image-side numerical aperture necessary for conducting recording and/or reproducing information of the optical information recording medium.

REFERENCES:
patent: 6411442 (2002-06-01), Ota et al.

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