Objective lens, optical pickup apparatus and recording...

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

2006-07-18

2006-07-18

Tran, Thang V. (Department: 2653)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112250, C369S112260, C369S044230, C359S717000, C359S719000

Reexamination Certificate

active

07079473

ABSTRACT:
An objective lens for use in an optical pickup apparatus has two positive lenses of a first lens arranged at a light source side and a second lens arranged at an information recording medium side and the objective lens comprises a first surface being a light source side optical surface of the first lens and a third surface being a light source side optical surface of the second lens, and at least two optical surfaces including the first surface and the third surface are made to be an aspherical surface respectively, and the objective lens satisfies the following formulas:in-line-formulae description="In-line Formulae" end="lead"?NA≧0.8in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.2 mm>f>0.3 mmin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−0.06>ΔSAG>−0.24in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?ΔSAG=(X1′−X3′)/(NA4·f·(1+|m|))in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?X1′=X1·(N1−3)3/f1in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?X3′=X3·(N2−1)3/f2.in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
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patent: 2002/0012313 (2002-01-01), Kimura et al.
patent: 0 863 502 (1998-09-01), None
patent: 10123410 (1998-05-01), None
patent: 11190818 (1999-07-01), None
patent: WO 02/27715 (2002-04-01), None
European Search Report.

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