Composite Fresnel lens assembly

Details Composite Fresnel lens assembly Composite Fresnel lens assembly

1975-03-03

1976-09-28

Corbin, John K.

Optics: image projectors

Plural projection paths with single light source

353 38, 156106, G02B 308, G03B 2114, B32B 1700

Patent

active

039828220

ABSTRACT:
Large area lens assembly, e.g., for an overhead projector, has glass stage bonded directly to plastic incremental lens to eliminate light-reflective interface and conserve space. Differential thermal expansion problems are overcome by critical selection of materials, dimensions and procedures. A unitary structure with multiple incremental lenses is made possible.

REFERENCES:
patent: 3511563 (1970-05-01), Erwin
patent: 3539412 (1970-11-01), Miller
patent: 3861785 (1975-01-01), Barbour
patent: 3873188 (1975-03-01), Barker

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