Fresnel lens with aspiteric grooves
DCFirst Claim
Patent Images
1. A Fresnel lens formed of a material capable of transmitting infrared energy rays, the lens comprising:
- a body, having a grooved surface;
the grooved surface having a plurality of grooves, which extend to the same depth;
the grooves being of different widths; and
a substantial portion of the grooves each individually having a surface formed thereon which is entirely aspherical and differs in contour from the surfaces of the other grooves.
3 Assignments
Litigations
0 Petitions
Accused Products
Abstract
A Fresnel lens formed of an infrared transmitting material has a grooved surface. The grooves all extend to the same depth, and the distances between successive grooves vary across the lens. In a circular lens, the grooves are concentric, and the distances between grooves nearer the center are longer than the distances between the grooves nearer the circumference. A substantial portion of the grooves have an aspherical surface.
-
Citations
2 Claims
-
1. A Fresnel lens formed of a material capable of transmitting infrared energy rays, the lens comprising:
-
a body, having a grooved surface; the grooved surface having a plurality of grooves, which extend to the same depth; the grooves being of different widths; and a substantial portion of the grooves each individually having a surface formed thereon which is entirely aspherical and differs in contour from the surfaces of the other grooves.
-
-
2. A Fresnel lens formed of a material capable of transmitting infrared energy rays, the lens comprising:
-
a body, having a substantially flat grooved surface; the grooved surface having a plurality of grooves, each of which extend to the same depth; the grooves being of different widths; and a substantial portion of the grooves each individually having a surface formed thereon which is entirely aspherical and differs in contour from the surfaces of the other grooves.
-
Specification