Correction lenses utilized to form fluorescent screens of colour

Details Correction lenses utilized to form fluorescent screens of colour Correction lenses utilized to form fluorescent screens of colour

1973-12-04

1976-02-03

Rolinec, R. V.

350175R, 354 1, G02B 304, G03B 2700

Patent

active

039361519

ABSTRACT:
In a correction lens wherein the effective surface thereof has at least a lens member having no island shaped portion, said member being defined by the step shaped border line never closing by themselves to form an island shaped lens segment on said correction lens surface.

REFERENCES:
patent: 3628850 (1971-12-01), Yamazaki et al.
patent: 3811754 (1974-05-01), Morrell et al.
patent: 3828358 (1974-08-01), Miyaoka

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