| 摘要 |
PURPOSE:To enable a light flux which passes through a lens to be emitted as collimated throughout light emitting points of all light emitting diode by a method wherein the incident and the emitting face of the lens are so constituted as to enable light rays emitted from a two-dimensional light emitting plane to be emitted from the emitting face as a parallel light flux passing through the incident face. CONSTITUTION:An incident face 6a and an emitting face 6b of the lens 6 of a light emitting diode are so designed as to enable light rays emitted from a two-dimensional light emitting plane or a light emitting diode chip 1 to be emitted from the emitting face 6b as a parallel light flux passing through the incident face 6a. The incident face 6a is formed into a spherical shape represented by a following equation, (X-A)<2>+Y<2>=1/c, where c1 denotes a curvature (mm<-1>) and A is an X-coordinate of a center of curvature. On the other hand, the emitting face 6b is formed into an elliptical or a parabolic plane represented by a formula 1. |
