Lighting System, And Method For Designing Lighting System

Abstract: A lighting system 1 is provided with a projection surface 3, and a lighting device 10 for projecting a projection pattern 4 onto the projection surface 3. The lighting device 10 includes a light source 12 for emitting coherent light, and a diffractive optical element 14 for forming the projection pattern 4 by causing the coherent light from the light source 12 to diffract. The diffractive optical element 14 includes a plurality of elemental diffractive optical elements 15 that are two-dimensionally arranged in directions parallel to the projection surface 3. A resolution basic period length r on the projection surface, determined from a specified resolution of the projection pattern 4 at an intersection position 5 of a perpendicular line dropped from the center of a certain elemental diffractive optical element 15 onto the projection surface 3, an angle ?, being half an angle subtended by the elemental diffractive optical element 15 at the position 5, and a wavelength ? of light included in the projection pattern 4 projected at the position 5 satisfy the following relationship (i). (i) … sin?>?/(6r)

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