Lighting device, lighting device design method and design device
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机译：照明装置，照明装置的设计方法及设计装置
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摘要
An illumination device that projects a projection pattern including information on a projection surface includes a light source that emits coherent light, and a diffractive optical element that diffracts the coherent light from the light source and projects the projection pattern. The diffractive optical element has a diffraction characteristic that allows a viewer to visually recognize predetermined information in a predetermined size, shape, and inclination angle when the observer turns his / her gaze in a first line of sight from a viewpoint position based on the position and direction of the diffractive optical element. Having.
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