Light irradiation device, optical wireless communication system, and light irradiation method

Abstract

This light emitting device emits an emission beam from a light generation device onto an object. The light emitting device includes: an image forming optical system; an optical member that emits, toward an image plane of the image forming optical system, light which enters through the image forming optical system, and that emits the emission beam from the light generation device which enters through a conjugate plane conjugate with the image plane, toward the image forming optical system; an imaging device that captures at least a portion of an image of an object formed on the image plane by the image forming optical system; a position changing device that changes the position on the conjugate plane of the emission beam from the light generation device to change an emission position of the emission beam emitted from the image forming optical system; and a control device that controls the position changing device on the basis of imaging results of the imaging device. The control device controls the position changing device on the basis of the imaging results of the imaging device to emit the emission beam emitted from the image forming optical system onto at least a portion of the object.