Patent ID: 9714754
Date: 2017-07-25
CPC Classifications: F21K,F21S,F21V,F21Y,G02B,H01L

Claim:
1. A lighting arrangement, comprising: a light source for generating light; a spreading element configured to laterally spread the generated light in a spreading plane, defined by an optical axis of the light source and a longitudinal axis of the spreading element, to give a uniform quantity of light per unit area at a plane orthogonal to the spreading plane and parallel to the longitudinal axis of the spreading element; and a light redirecting element provided with a collecting surface to collect the laterally spread light and an emission face to emit the collected light, wherein the light redirecting element comprises a single Fresnel lens associated with the light source and is configured to emit the collected light uniformly from the emission face, the emission face is longitudinal planar and comprises a long rectangular emission face, and the collecting surface comprises a central refractive zone arranged to coincide with the optical axis of the light source and a plurality of distinct lateral refracting zones at sides of the central refractive zone for collecting the laterally spread light, wherein each of the distinct lateral refracting zones comprises a respective collecting face arranged to collect a light portion from said spreading element having a certain incidence angle range and a respective refracting body for refracting the light portion through the emission face, wherein the surface areas of at least a first subset of the collecting faces progressively increase as a distance of the collecting faces of the first subset from said light source increases along a direction and wherein the surface areas of at least a second subset of the collecting faces progressively decrease as a distance of the collecting faces of the second subset from said light source increases along said direction, wherein said second subset is disposed farther from said light source than said first subset along said direction and wherein the rate of the progressive increase is symmetrical with the rate of the progressive decrease and wherein each of the first subset of the collecting faces and the second subset of the collecting faces extend to a point and each point is positioned a same distance from the emission face.