Optics: image projectors – Plural projection paths with single light source
Patent
1976-08-12
1979-05-15
Corbin, John K.
Optics: image projectors
Plural projection paths with single light source
350178, 350253, 353 39, G02B 104
Patent
active
041545060
ABSTRACT:
A projection lens plate for a microfiche and method of its manufacture. A base or substrate having greater dimensional stability against creepage, humidity, and thermal cycling than the optic material carries a plurality of openings for receiving extruded optic material, the optic material forming lenses after hardening. Extrusion passages in a die head carry the optic material to the substrate openings. The die head is provided with accurately spaced lens-forming cavities onto which the optic material flows to thereby form lenses. By this process and apparatus the lenses are very accurately located relative to each other, while the openings in the substrate need not be accurately located relative to each other. The substrate openings are larger than the diameter of the lenses. Further, by fashioning the substrate of a dimensionally stabler material than the lens material, accurate registry of the lenses vis a vis each other is maintained.
REFERENCES:
patent: 1466973 (1923-09-01), Takanashi
patent: 3263088 (1966-07-01), Goldfischer
patent: 3532038 (1970-10-01), Rottmann
patent: 3586816 (1971-06-01), Hagen
patent: 3706486 (1972-12-01), DE Montebello
Corbin John K.
Greer, Jr. Thomas J.
Izon Corporation
Lee John D.
Rosen Daniel M.
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