Reproducing objective for video disks

Details Reproducing objective for video disks Reproducing objective for video disks

1979-08-08

1981-03-24

Sacher, Paul A.

350414, G02B 934

Patent

active

042576792

ABSTRACT:
A reproducing objective for video disks comprising a first, second, third and fourth lenses, the first lens being a plano-convex lens, the second lens being a plano-concave lens, the third lens being a positive lens, the fourth lens being a positive meniscus lens, the reproducing objective for video disks having high resolving power and long working distance.

REFERENCES:
patent: 3915559 (1975-10-01), Fleischman
patent: 3942877 (1976-03-01), Fleischman
patent: 3944338 (1976-03-01), Fleischman

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