Fresnel lens, screen, image displaying device, lens forming...

G - Physics – 03 – B

Patent

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Details

G03B 21/60 (2006.01) B23B 5/00 (2006.01) B23B 27/20 (2006.01) B29C 33/38 (2006.01) B29C 39/02 (2006.01) B29C 39/26 (2006.01) G02B 3/08 (2006.01) G03B 21/62 (2006.01)

Patent

CA 2393022

A Fresnel lens has a plurality of pitch areas in which a plurality of hybrid type prism portions are arranged. Each hybrid type prism portion has a refraction type prism portion and a total reflection type prism portion. In the refraction type prism portion, a ray of incident light Li1 of an incident angle "a" is refracted twice and goes out as a ray of outgoing light Lo1 of an outgoing angle "f". In the total reflection type prism portion, a ray of incident light Li2 of the incident angle "a" is refracted, totally reflected and refracted in that order and goes out as a ray of outgoing light Lo2 parallel to the ray of outgoing light Lo1.

L'invention concerne une lentille de Fresnel présentant un pas comprenant un prisme. Ce prisme comporte une unité de prisme à réfraction (3A) destinée à émettre une lumière incidente (li1) à un angle incident (a) sous la forme d'une lumière sortante (lo1) à un angle sortant (f) avec deux réfractions, ainsi qu'une unité de prisme à réflexion totale (4A) destinée à émettre une lumière incidente (li2) à un angle incident (a) sous la forme d'une lumière sortante (lo2) parallèle à la lumière sortante (lo1) avec une réfraction, une réflexion totale et une réfraction.

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