Zero luminance lighting panel

Claim 2

A transparent prismatic lighting panel comprising in its outer surface a plurality of pointed optical prismatic refracting elements having respective axes of symmetry which pass through their vertices, the axial sections of said prismatic elements taken in planes normal to their lateral surfaces being limited by symmetrical curved lines with respect to the said axis of symmetry, the convexity of said curved lines being towards the outside of the panel, said optical prismatic refracting elements consist of pyramids the lateral faces of which are equal cylindrical surfaces and the curvature of the generatrix of said cylindrical surfaces is such that the sections of each pyramid taken according to axial planes normal to two opposite faces of the said lateral faces are limited by two arcs of circumference symmetrical with respect to said axis of symmetry of the pyramid, the center of said arcs of circumference being situated above the base of the pyramid and symmetrically on opposite sides of said axis of symmetry of the pyramid.

Claim 3

A transparent prismatic lighting panel comprising in its outer surface a plurality of pointed optical prismatic refracting elements having respective axes of symmetry which pass through their vertices, the axial sections of said prismatic elements taken in planes normal to their lateral surfaces being limited by symmetrical curved lines with respect to the said axis of symmetry, the convexity of said curved lines being towards the outside of the panel, said optical prismatic refracting elements consist of pyramids the lateral faces of which are equal cylindrical surfaces and the curvature of the generatrix of said cylindrical surfaces is such that the sections of each pyramid taken according to axial planes normal to two opposite faces of the said lateral faces are limited by two arcs of circumference symmetrical with respect to said axis of symmetry of the pyramid, the center of said arcs of circumference being situated above the base of the pyramid and symmetrically on opposite sides of said axis of symmetry of the pyramid.

Claim 4

A transparent prismatic lighting panel comprising in its outer surface a plurality of pointed optical prismatic refracting elements having respective axes of symmetry which pass through their vertices, the axial sections of said prismatic elements taken in planes normal to their lateral surfaces being limited by symmetrical curved lines with respect to the said axis of symmetry, the convexity of said curved lines being towards the outside of the panel, said optical prismatic refracting elements consist of pyramids the lateral faces of which are equal cylindrical surfaces and the curvature of the generatrix of said cylindrical surfaces is such that the sections of each pyramid taken according to axial planes normal to two opposite faces of the said lateral faces are limited by two arcs of circumference symmetrical with respect to said axis of symmetry of the pyramid, the center of said arcs of circumference being situated above the base of the pyramid and symmetrically on opposite sides of said axis of symmetry of the pyramid.

Claim 5

A transparent prismatic lighting panel according to claim 1 in which said pyramids have hexagonal bases.

Claim 6

A transparent prismatic lighting panel which has on its exterior surface a plurality of optical refracting pyramids, each one of which has an axis of symmetry which passes through its vertex and the lateral faces of which are equal cylindrical surfaces and the sections of each of said pyramids taken in axial planes normal to two of said lateral faces are limited by two arcs of circumference symmetrical with reference to said axis of symmetry of the pyramid, the centers of said arcs of circumference being situated above the base of the pyramid and symmetrically on opposite sides of said axis of symmetry of the pyramid at the points determined by the formulae: gamma 180* - 2(90* - Alpha /2 + Beta ) Alpha - 2 Beta ; and delta 180* - (90* + Beta + gamma ) 90* - Alpha + Beta where: Alpha is the angle in the vertex of the section of the pyramid between the chords of the arcs of circumference; Beta is the angle formed with the base of the pyramid by a straight line normal to a tangent of one of said arcs of circumference at the point at which the arc cuts the base of the pyramid; gamma is the angle covered by each of the said arcs of circumference; and delta is the angle which, with the said axis of symmetry of the pyramid, forms the extreme radius of each of said arcs of circumference which passes through the vertex of the pyramid.

Claim 7

A transparent prismatic lighting panel which has on its exterior surface a plurality of optical refracting pyramids, each one of which has an axis of symmetry which passes through its vertex and the lateral faces of which are equal cylindrical surfaces and the sections of each of said pyramids taken in axial planes normal to two of said lateral faces are limited by two arcs of circumference symmetrical with reference to said axis of symmetry of the pyramid, the centers of said arcs of circumference being situated above the base of the pyramid and symmetrically on opposite sides of said axis of symmetry of the pyramid at the points determined by the formulae: gamma 180* - 2(90* - Alpha /2 + Beta ) Alpha - 2 Beta ; and delta 180* - (90* + Beta + gamma ) 90* - Alpha + Beta where: Alpha is the angle in the vertex of the section of the pyramid between the chords of the arcs of circumference; Beta is the angle formed with the base of the pyramid by a straight line normal to a tangent of one of said arcs of circumference at the point at which the arc cuts the base of the pyramid; gamma is the angle covered by each of the said arcs of circumference; and delta is the angle which, with the said axis of symmetry of the pyramid, forms the extreme radius of each of said arcs of circumference which passes through the vertex of the pyramid.

Claim 8

A transparent prismatic lighting panel according to claim 3 wherein the value of angle Alpha is essentially 100* and the value of angle Beta is essentially 25*.

Claim 9

A transparent prismatic lighting panel according to claim 3 in which said pyramids have hexagonal bases.

Claim 10

A transparent lighting panel comprising in its outer surface a plurality of pointed optical prismatic refracting elements having respective axes of symmetry which pass through their vertices, the axial sections of said prismatic elements taken in planes normal to their lateral surfaces being limited by symmetrical curved lines with respect to the said axis of symmetry, the convexity of said curved lines being towards the outside of the panel, said optical prismatic refracting elements consisting of cones having circular bases, the generatrix of said cones being a curved line of such curvature that the sections of each of said optical cones taken through planes parallel to said axis of symmetry and normal to the base of said cone at the median point of radius are limited by arcs of circumferences symmetrical with respect to a straight line normal to said base at the median point of said radius, the centers of said arcs of circumference being situated above the base of said cone and symmetrically on opposite sides of said straight line.

Claim 11

A transparent lighting panel comprising in its outer surface a plurality of pointed optical prismatic refracting elements having respective axes of symmetry which pass through their vertices, the axial sections of said prismatic elements taken in planes normal to their lateral surfaces being limited by symmetrical curved lines with respect to the said axis of symmetry, the convexity of said curved lines being towards the outside of the panel, said optical prismatic refracting elements consisting of cones having circular bases, the generatrix of said cones being a curved line of such curvature that the sections of each of said optical cones taken through planes parallel to said axis of symmetry and normal to the base of said cone at the median point of radius are limited by arcs of circumferences symmetrical with respect to a straight line normal to said base at the median point of said radius, the centers of said arcs of circumference being situated above the base of said cone and symmetrically on opposite sides of said straight line.

Claim 12

A transparent prismatic light panel according to claim 6 comprising, in its outer surface, a plurality of optical cones similar to, but smaller than, said conical refracting cones, substantially filling the spaces between the bases of said larger optical refracting cones.

Claim 13

A transparent prismatic lighting panel comprising, in its outer surface, a plurality of circular based optical refracting cones, each cone having an axis of symmetry which passes through its vertex, the generatrix of said cone being a curved line and sections of each one of said optical cones taken through planes parallel to said axis of symmetry and normal to the base of said cone at the median point of a radius are limited by two arcs of circumference symmetrical with respect to a straight line normal to said base at the median point of said radius, the centers of said arcs of circumference being situated above the base of said cone and symmetrically situated on opposite sides of said straight line at points determined by the following formulae: gamma 180* - 2(90* - Alpha /2 + Beta ) Alpha - 2 Beta ; and delta 180* - (90* + Beta + gamma ) 90* - Alpha + Beta where: Alpha is the angle in the vertex of the section of the pyramid between the chords of the arcs of circumference; Beta is the angle formed with the base of the pyramid by a straight line normal to a tangent of one of said arcs of circumference at the point at which the arc cuts the base of the pyramid; gamma is the angle covered by each of the said arcs of circumference; and delta is the angle which, with the said axis of symmetry of the pyramid, forms the extreme radius of each of said arcs of circumference which passes through the vertex of the pyramid.

Claim 14

A transparent prismatic lighting panel comprising, in its outer surface, a plurality of circular based optical refracting cones, each cone having an axis of symmetry which passes through its vertex, the generatrix of said cone being a curved line and sections of each one of said optical cones taken through planes parallel to said axis of symmetry and normal to the base of said cone at the median point of a radius are limited by two arcs of circumference symmetrical with respect to a straight line normal to said base at the median point of said radius, the centers of said arcs of circumference being situated above the base of said cone and symmetrically situated on opposite sides of said straight line at points determined by the following formulae: gamma 180* - 2(90* - Alpha /2 + Beta ) Alpha - 2 Beta ; and delta 180* - (90* + Beta + gamma ) 90* - Alpha + Beta where: Alpha is the angle in the vertex of the section of the pyramid between the chords of the arcs of circumference; Beta is the angle formed with the base of the pyramid by a straight line normal to a tangent of one of said arcs of circumference at the point at which the arc cuts the base of the pyramid; gamma is the angle covered by each of the said arcs of circumference; and delta is the angle which, with the said axis of symmetry of the pyramid, forms the extreme radius of each of said arcs of circumference which passes through the vertex of the pyramid.

Claim 15

A transparent prismatic lighting panel according to claim 8 wherein the value of angle Alpha is essentially 100* and the value of angle Beta is essentially 25*.