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...

2011-08-30

2011-08-30

Nguyen, Hoa T (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

08009544

ABSTRACT:
An objective lens consists of a single lens element. A light source side surface is formed into a convex surface having a large curvature, and an optical recording medium side surface has a small curvature. The both surfaces are formed into aspheric surfaces. Also, the objective lens satisfies the following expressions (1) to (3):in-line-formulae description="In-line Formulae" end="lead"?0.70<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<3.00  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.50<g/d<0.80  (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, in mm, of the objective lens on an optical axis, andg is a distance, in mm, from a tangential plane that is perpendicular to the optical axis and is tangent to a vertex of the light source side surface of the objective lens, to a center of gravity of the objective lens.

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Notice of Allowance issued in U.S. Appl. No. 12/273,139 on Mar. 16, 2011.
U.S. Office Action issued in U.S. Appl. No. 12/273,139 on Sep. 17, 2010.
U.S. Office Action issued in U.S. Appl. No. 12/273,193 on Nov. 15, 2010.
Office Action issued in copending U.S. Appl. No. 12/273,193 on Apr. 26, 2011.

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