Medium magnification objective for video disks

Details Medium magnification objective for video disks Medium magnification objective for video disks

1977-05-27

1978-12-19

Clark, Conrad J.

350220, 350175ML, G02B 934, G02B 960

Patent

active

041303504

ABSTRACT:
A medium magnification objective for video disks comprising a first, second, third and fourth lens components in which the first lens component is a negative lens, the second lens component is a positive meniscus lens with its concave surface positioned toward the object, the third lens component consists of one or two positive lenses, the fourth lens component is a negative meniscus lens with its convex surface positioned toward the object, and for which the number of lenses constituting the objective is small, the working distance is large, flatness of image is high and resolving power is also high.

REFERENCES:
patent: 2206155 (1940-07-01), Boegehold
patent: 3879111 (1975-04-01), Goto

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