Objective lens for optical disk

Details Objective lens for optical disk Objective lens for optical disk

1990-05-25

1991-02-26

Sugarman, Scott J.

350414, G02B 906, G02B 2102

Patent

active

049957104

ABSTRACT:
An objective lens for an optical disk has a first lens group constructed by joining a negative meniscus lens, a biconvex lens, and a negative meniscus lens sequentially arranged from the side of a light source; and a second lens group constructed by a positive meniscus lens. The first and second lens groups are sequentially arranged from the side of the light source toward the side of the optical disk. A combined focal distance f of the entire lens system, a focal distance f.sub.1 of the first lens group, a radius r.sub.i (i=1 to 6) of curvature of an i-th lens face from the side of the light source, and a refractive index n.sub.j and an Abbe number .nu..sub.j (j=1 to 4) of a j-th lens from the side of the light source satisfy the following conditions,

REFERENCES:
patent: 4270843 (1981-06-01), Goto
patent: 4484803 (1984-11-01), Arai
patent: 4588264 (1986-05-01), Shimizu
patent: 4666256 (1987-05-01), Shimizu et al.

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