Process for manufacture of fresnel lenses

Details Process for manufacture of fresnel lenses Process for manufacture of fresnel lenses

1997-03-04

1999-02-09

Dang, Hung Xuan

Optical: systems and elements

Lens

With multipart element

264 16, 264 17, 264 19, 26417316, 2642102, 264284, G02B 308, B29D 1100, B29C 4706

Patent

active

058702334

ABSTRACT:
A process for the extrusion of plastic plates with very finely structured surface using an extrusion system which is equipped with an extruder and a three roll polishing stack containing a roller with the structuring surface. The system is designed for coextrusion and the plastic plates are produced via two extruders as a coextrudate CX from a highly viscous basic molding compound BF and a low viscosity molding compound NF which is extruded on BF. The surface of said plates is structured via the three roll polishing stack. Fresnel lenses produced by the process may be used in solar collectors.

REFERENCES:
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patent: 3241429 (1966-03-01), Rice et al.
patent: 3810804 (1974-05-01), Rowland
patent: 4149817 (1979-04-01), Miller et al.
patent: 4543225 (1985-09-01), Beaujean
patent: 4921669 (1990-05-01), Vetter et al.
patent: 4934324 (1990-06-01), Lenz
patent: 5183597 (1993-02-01), Lu
patent: 5656209 (1997-08-01), Benz et al.

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