Objective lens, optical pickup device having the same, and...

Details Objective lens, optical pickup device having the same, and... Objective lens, optical pickup device having the same, and...

2008-11-18

2011-11-22

Klimowicz, William J (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

08064319

ABSTRACT:
An objective lens consists of a single lens element, and has a light source side surface formed into a convex surface having a large curvature and an optical recording medium side surface has a small curvature. The both surfaces are aspheric surfaces. Also, the objective lens satisfies the following expressions (1) to (3):in-line-formulae description="In-line Formulae" end="lead"?0.7<NA<0.98  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.70<d/f<1.40  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.48<X<0.55  (3).in-line-formulae description="In-line Formulae" end="tail"?where NA denotes a numerical aperture of the objective lens on an optical recording medium side,d denotes a thickness of the objective lens on an optical axis in mm, andf denotes a focal length of the objective lens in mm.X is equal to (X1−X2)·(n−1)/(NA·f), where X1 and X2 denote values relating to sag amounts in the respective surfaces, and n denotes a refractive index.

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Notice of Allowance issued in copending U.S. Appl. No. 12/273,251 dated Apr. 27, 2011.
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JP Office Action issued in corresponding JP Patent Application No. 2007-299434 on Aug. 23, 2011.

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