To protect observer's eyes while forming a clear illumination pattern (21) on a desired region to be illuminated (20). An illumination device (100) includes a light source (110) that emits coherent light, a collimating optical system (120) that enlarges and collimates a beam diameter of the coherent light emitted from the light source, and a diffractive optical element (130) that diffracts the coherent light collimated by the collimating optical system into a predetermined diffusion angle space. The diffractive optical element (130) has a plurality of element diffractive optical portions (131) and has a function to illuminate the region to be illuminated (20) defined at a predetermined position and having predetermined size and shape to form the desired illumination pattern (21). Each of the plurality of element diffractive optical portions (131) has a function to illuminate at least a part of the region to be illuminated (20), and diffractive characteristics of the element diffractive optical portions (131) are different from each other.
ILLUMINATION DEVICE AND METHOD FOR MANUFACTURING SAME
BELEUCHTUNGSVORRICHTUNG UND VERFAHREN ZUR HERSTELLUNG DAVON
DISPOSITIF D'ÉCLAIRAGE ET SON PROCÉDÉ DE FABRICATION
2020-06-17
Patent
Elektronische Ressource
Englisch
IPC: | F21S Ortsfeste Leuchten , NON-PORTABLE LIGHTING DEVICES / B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein / F21V FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF , Funktionsmerkmale oder Einzelheiten von Leuchten oder Beleuchtungssystemen / F21W Index-Schema in Verbindung mit den Unterklassen F21K, F21L, F21S und F21V, betreffend den Gebrauch oder Einsatz von Leuchten oder Beleuchtungssystem , INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS / F21Y Index-Schema in Verbindung mit den Unterklassen F21K, F21L, F21S und F21V, betreffend die Form oder die Art der Lichtquellen oder die Farbe des emittierten Lichts , INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED / G02B Optische Elemente, Systeme oder Geräte , OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS / G03H Holografische Verfahren oder Vorrichtungen , HOLOGRAPHIC PROCESSES OR APPARATUS |
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