CPC G02B 3/08 (2013.01) [B29D 11/00269 (2013.01); G02B 1/041 (2013.01); G02B 1/14 (2015.01); B29K 2033/12 (2013.01)] | 11 Claims |
1. An optical lens device for a head-mounted display, comprising:
a transparent support substrate; and
a Fresnel lens disposed on said support substrate, and including a central lens element and a plurality of prismatic elements arranged relative to said central lens element in a proximal-to-distal manner, each of said prismatic elements having a base that faces toward said support substrate, and a draft facet and a sloped facet that extend from said base away from said support substrate to intersect with each other to form an apex, each of said prismatic elements having a height that is measured from said base to said apex and that is not greater than 75 μm, said base having a width that is not greater than 250 μm,
wherein each of said prismatic elements has a radius of curvature at said apex that is not greater than 2 μm;
wherein said draft facet of one of said prismatic elements intersects with said sloped facet of an adjacent one of said prismatic elements to form a groove nadir, a radius of curvature at said groove nadir being not greater than 2 μm; and
wherein said Fresnel lens is made from ultraviolet (UV)-curable resin.
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