COMPACT OPTICAL SYSTEM AND LENSES FOR PRODUCING UNIFORM COLLIMATED LIGHT Russian patent published in 2013 - IPC F21S8/10 F21V5/04 

FIELD: physics.

SUBSTANCE: optical system includes a cylindrical side emitter lens, a reflector and a cylindrical Fresnel lens. The cylindrical side emitter lens redirects light from a light source, such as multiple light-emitting diodes arranged in a row, into side emitted light along an optical axis which is parallel with the exit plane. The reflector may be a stepped multi-focal length reflector which includes multiple reflector surfaces with different focal lengths based on the distance from the surfaces to the light source and height to redirect light from the cylindrical side emitter lens to illuminate the exit plane and collimate the light along one axis in the forward direction. The cylindrical Fresnel lens is used to collimate the light along an orthogonal axis in the forward direction.

EFFECT: formation of a uniformly illuminated exit plane with well collimated light in the forward direction.

15 cl, 5 dwg