Dual grooved fresnel lens for overhead projection

Details Dual grooved fresnel lens for overhead projection Dual grooved fresnel lens for overhead projection

G - Physics

02

B

88/46.5

G02B 3/08 (2006.01) G03B 21/132 (2006.01)

Patent

CA 2003077

This invention consists of a Fresnel lens having focusing grooves on both sides of a single element. The relative frequencies of the grooved surfaces are controlled such that Moire interference patterns between the two grooved surfaces are reduced. Specifically, the frequency of the Fresnel elements on one surface of the is at least four times that of the Fresnel elements on the other surface and not a integral multiple thereof.

Cette invention est une lentille de Fresnel constituée d'un seul élément dont les deux côtés comportent des sillons focalisants. Les fréquences relatives des surfaces sur lesquelles sont réalisés les sillons sont commandées de manière à réduire les diagrammes d'interférence entre les deux surfaces sur lesquelles sont pratiqués les sillons. Plus précisément, la fréquence des éléments de Fresnel sur une surface est au moins quatre fois plus grande que celle des éléments de Fresnel sur l'autre surface, sans toutefois en être un multiple entier.

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