CPC F21S 11/002 (2013.01) [F21S 11/007 (2013.01); F21V 5/02 (2013.01)] | 5 Claims |
1. A natural light homogenization lighting device, comprising a front surface array and a rear surface array,
wherein the front surface array is a free-form surface array, the rear surface array is a sawtooth surface array, and the free-form surface array is configured to collect outdoor natural light, and to transmit the outdoor natural light to the sawtooth surface array through an intermediate medium; and
wherein the sawtooth surface array is configured to deflect the incident natural light to an indoor space after the outdoor natural light is refracted by an inclined surface;
wherein the lens form of the free-form surface array is a convex free-form surface or a concave free-form surface, the convex free-form surface or concave free-form surface faces the incident direction of natural light, and the normal of the lens surface forms an acute angle to the incident angle of natural light;
for the convex free-form surface, an expression of the thickness d 1 at different positions x1 and y1 is
wherein n represents the refractive index, r represents the radius of curvature at the vertex of the convex free-form surface, ϑ3 represents a surface-type inclination angle of the convex free-form surface, which makes the light propagate in the horizontal direction through refraction, and the radius of curvature is 1-5 times the minimum spacing between the free-form surface and the sawtooth grating; for the concave free-form surface, an expression of the thickness d2 at different positions x1 and y1 on the concave free-form surface array is
where n represents the refractive index, r represents the radius of curvature at the vertex of the concave free-form surface, and ϑ3 represents a surface-type inclination angle of the concave free-form surface, which makes the light propagate in the horizontal direction through refraction, and the radius of curvature is 1-5 times the minimum spacing between the free-form surface and the sawtooth grating.
|