Patent ID: 9145686
Filing Date: 2015-09-29
Classification: E04D

Abstract:
1. A skylight dome; said dome formed of light transmitting material; at least an internal surface of said dome provided with prismatic structures arranged so as to direct incident light from outside said dome to points on a surface of a light tube extending from below a lower periphery of said dome; said prismatic structures formed as adjoining facets of a plurality of curved ridges; at least one of said facets being a refracting facet wherein a surface of said refracting facet at any point along the length of a said curved ridge forms a predetermined angle relative to an internal surface of said dome at said point; said predetermined angle varying throughout the length of said curved ridge; each of said curved ridges extending from a first upper end to a second lower end; said first upper end located on a first meridian of said dome with said second lower end located on a second meridian; said first and second meridians lying at a predetermined angular separation.