| 摘要 |
FIELD: physics, optics.SUBSTANCE: optical element (2) for collimating light from a light source (3) is made from a single piece of material and comprises: an input side (5) arranged to receive light, an output side (6) arranged to allow emission of collimated light, and an element body extending from said input side (5) to the output side (6). The element body has a cross-section perpendicular to an optical axis (z) formed by x and y axes that are perpendicular to each other. The output side (6) has an oval shape in the cross-section. The optical element (2) has a y curvature radius along the y axis which is greater than the x curvature radius along the x axis, thereby enabling distribution of collimated light emitted from the output side (6) to have a cross-section of an oval shape (C) perpendicular to the optical axis (z). The refraction index of the element body is greater than that of the ambient medium and the x and y curvature radii are selected to satisfy the total internal reflection condition.EFFECT: providing asymmetric distribution of light with increased beam-width difference in two perpendicular viewing directions.13 cl, 9 dwg |
