Patent ID: 9188311
Filing Date: 2015-11-17
Classification: A61B,F21V,G03B,G21K,H04N

Abstract:
1. A phosphor device to generate light, the phosphor device comprising: a carrier member having upper and lower faces; a phosphor layer arranged at the upper face of the carrier member, wherein the phosphor layer comprises at least two tiled phosphor zones; an optical transmitting member having a first end face and a second end face, the optical transmitting member being arranged with said first end face at a top portion of the phosphor layer and said second end face remote therefrom, wherein the phosphor device is configured to enable movement of the carrier relative to the optical transmitting member along a longitudinal axis so that the first end face of the optical transmitting member moves longitudinally across the phosphor zones, wherein, when the light is generated, the first end face of the optical transmitting member covers at least a subarea of each of the at least two phosphor zones wherein the phosphor zones are configured such that widths of the phosphor zones vary in a step-like manner so that the proportions of the subareas of the phosphor zones covered by the first end face of the optical transmitting member change by the relative movement of the carrier relative to the optical transmitting member, and the length of each step equals a length of the first end face of the optical transmitting member in the direction of the longitudinal axis so that different color temperatures are produced when the optical transmitting member is positioned at each step.