Method and device for converged lighting

TLDR: In this article, the authors proposed a method to efficiently converge projection luminous flux from a light source, guiding the converged luminous flow to a necessary restricted lighting area and making the luminous fluid into a parallel light beam, and obtaining uniform and bright illumination light.

Abstract: PURPOSE: To efficiently converge projection luminous flux from a light source, guides the converged luminous flux to a necessary restricted lighting area and make the luminous flux into a parallel light beam, and to obtain uniform and bright illumination light. CONSTITUTION: The light beams (A 1 and B 1 ) which are emitted by the light source positioned at a focus F1 of a parabolic reflector 21 and directly reflected by reflecting surfaces 21A and 21B of the parabolic reflector 21 are made into parallel beams, which are projected. Light beams (A 2 and B 2 ) which are emitted from F1 and directly reflected by the reflecting surfaces 21A and 21B of the parabolic reflector 21 become slanting lights which slant to an optical axis of projection. Light beams (C 2-1 and D 2-1 ) which are emitted from F2 and reflected by reflecting surfaces 23C and 23D of an elliptic reflector 23, on the other hand, pass the focus F1 of the parabolic reflector 21 and are then reflected by reflecting surfaces 21C and 21D of the parabolic reflector 21 to become parallel light beams. COPYRIGHT: (C)1994,JPO&Japio