Medium magnification objective for video disks

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

1977-02-24

1978-07-18

Clark, Conrad J.

350175ML, G02B 934

Patent

active

041012046

ABSTRACT:
A medium magnification objective for video disks comprising four single lenses for which the number of lenses constituting the objective is small, the working distance is large and flatness of image is high.

REFERENCES:
patent: 3659924 (1972-05-01), Shoemaker
patent: 3982821 (1976-09-01), Shoemaker

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