초록 ▼

A lens for substantially collimating light in one axis and spreading light in an axis substantially perpendicular to the collimation axis including a lens an entry face which is positive and cylindrical, having a cross-section which includes the positive cylindrical curvature and having tapered side

A lens for substantially collimating light in one axis and spreading light in an axis substantially perpendicular to the collimation axis including a lens an entry face which is positive and cylindrical, having a cross-section which includes the positive cylindrical curvature and having tapered sides substantially parallel to the refracted rays produced by the cylinders curvature and a circular convex or a spheric exit face perpendicular to the cylindrical curvature.

대표청구항 ▼

What is claimed is: 1. A lens for substantially collimating light in one axis and spreading light in an axis substantially perpendicular to the collimation axis comprising a lens, an entry face which is positive and cylindrical, having a cross-section which includes the positive cylindrical curvatu

What is claimed is: 1. A lens for substantially collimating light in one axis and spreading light in an axis substantially perpendicular to the collimation axis comprising a lens, an entry face which is positive and cylindrical, having a cross-section which includes the positive cylindrical curvature and having tapered sides substantially parallel to the refracted rays produced by the cylinders curvature and a circular convex or a spheric exit face perpendicular to the cylindrical curvature. 2. A lens as in claim 1 having an entry face which is essentially flat and tapered sides reflecting light by total internal reflection. 3. A lens as in claim 1 having an entry face with a linear positive fresnel surface. 4. A lens as in claim 1 having an exit face which has a convex surface on the same axis of curvature of the entry face. 5. A ring lens comprising a plurality of lens segments, each as described in claim 1 for radially distributing collimated light. 6. A ring lens as in claim 5 having an inner ring of cylindrical lenses for collimating beams along radial axis's of the ring and an outer lens ring comprised of lens segments as described in claim 1 to receive light from the inner ring. 7. A ring lens as in claim 5, having an entry face having wedge segments for partially covering said entry face, wherein wedge segments have varying degrees of power. 8. A lens as in claim 1 having an entry face having wedge segments for partially covering said entry face.