Patent ID: 9217865
Filing Date: 2015-12-22
Classification: F21S,F21V,F21W,G01J,G02B,G03B,H04N

Abstract:
1. A light projection device that projects light onto an object arranged in an arbitrary space, comprising: a light projector that projects projection light, in which the object and a back surface of the object are taken as a projectable range; a shadow region detector that detects a shadow region occurring on the back surface of the object by the projection light projected from the light projector; a shadow region corrector that corrects the shadow region so that a projection region of the light projector and the shadow region detected by the shadow region detector can coincide with each other on the back surface of the object, the shadow region being detected by the shadow region detector; a projection range setting unit that sets, as a light projection range, the shadow region corrected by the shadow region corrector, and sets, as a non-light projection range, a region other than the shadow region, in a case of irradiating the projection light only onto the target object; and a projection light setting unit that sets projection light projected onto the light projection range set by the projection range setting unit, wherein the light projector projects light onto a range where the object is present by projecting the projection light onto the light projection range set by the projection range setting unit, the projection light being set by the projection light setting unit.