Objective lens

Details Objective lens Objective lens

1998-06-12

2000-09-26

Sugarman, Scott J.

Optical: systems and elements

Lens

Including a nonspherical surface

359721, 369 4423, 369112, G02B 1318, G02B 310, G11B 700

Patent

active

061249882

ABSTRACT:
An objective lens that allows spherical aberration to be suppressed during the reproduction of a CD without sacrificing reproduction characteristics of a DVD, has a first numerical aperture comprising a refracting surface that is in rotatory symmetry about an optical axis. A part of the refracting surface is displaced along the optical axis as an annular concave (or convex) portion centered on the optical axis. The annular concave (or convex) portion has a certain inner diameter r.sub.1 and a certain outer diameter r.sub.2 that reduce RMS aberration V to a value close to a minimum value. The annular portion has a certain depth (or height).

REFERENCES:
patent: 5703862 (1997-12-01), Lee et al.
patent: 5777803 (1998-07-01), Ju et al.
patent: 5835283 (1998-11-01), Yamanaka
patent: 5889748 (1999-03-01), Shimano et al.

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