Objective lens for use with information storage disks

Details Objective lens for use with information storage disks Objective lens for use with information storage disks

1982-09-30

1985-12-03

Corbin, John K.

G02B 914

Patent

active

045562962

ABSTRACT:
An objective lens for use with an information storage disk comprises a three-group three-element lens system including a first group composed of a positive-meniscus lens having a convex side directed toward a light source, a second group composed of a negative-meniscus lens having a concave side directed toward the light source, and a third group composed of a positive-meniscus lens having a convex side directed toward the light source. The objective lens satisfies the following requirements:

REFERENCES:
patent: 4139267 (1979-02-01), Minoura
patent: 4416519 (1983-11-01), Kobayashi

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