Objective lens for regenerating a video disc

Details Objective lens for regenerating a video disc Objective lens for regenerating a video disc

1982-11-22

1984-11-27

Corbin, John K.

350410, 350414, G02B 906, G02B 2102

Patent

active

044848030

ABSTRACT:
This invention relates to an objective lens for regenerating a video disc or the like. A semiconductor laser is used as a light source to directly drive an objective lens for carrying out tracking, and thus the lens must be small and light-weight, but the aberration on the optical axis could well be corrected. However, because of small-size of lens, a manufacture error such as eccentricity is greatly affected. A positive meniscus lens on the image side is approximated to a concentric configuration by an objective lens comprising two lenses whereby the influence resulting from eccentricity may be minimized.

REFERENCES:
patent: 1620339 (1927-03-01), Frederick et al.
patent: 4029398 (1977-06-01), Koizumi
patent: 4270843 (1981-06-01), Goto

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