Reproducing objective for video disks

Details Reproducing objective for video disks Reproducing objective for video disks

1980-04-23

1982-06-01

Evans, F. L.

350414, G02B 934

Patent

active

043324428

ABSTRACT:
A reproducing objective for video disks comprising a first, second, third and fourth lenses in the order from the reproducing light source side, the first lens being a biconvex or plano-convex lens, the second lens being a negative meniscus lens, the third lens being a biconvex or plano-convex lens, the fourth lens being a positive meniscus lens, at least one of these lenses being arranged as a plastic lens, the reproducing objective being extremely light in weight and having a long working distance and high resolving power.

REFERENCES:
patent: 3915559 (1975-10-01), Fleischman
patent: 3942877 (1976-03-01), Fleischman
patent: 3944338 (1976-03-01), Fleischman
patent: 4065205 (1977-12-01), Fleischman
patent: 4206977 (1980-06-01), Goto
patent: 4257679 (1981-03-01), Okawa

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