LED ILLUMINATION DEVICE WITH CONTROLLED LIGHT DISTRIBUTION, ILLUMINATION APPARATUS, AND ILLUMINATION METHOD USING APPARATUS

摘要

Provided is an illumination method in which it is possible to achieve illumination in which the required illuminance corresponding to the subject of illumination is obtained, wastefulness is eliminated, and color unevenness is minimized. In this illumination method, there is used an LED illumination apparatus provided with a plurality of LED illumination devices having: a light distribution angle control lens part (130) for receiving light radiated from a light source and controlling the light to a predetermined light distribution angle; and a microlens array part (131) containing a plurality of microlenses, the microlens array part (131) receiving and dispersing the radiated light for which the light distribution angle is controlled. The microlenses are anisotropic microlenses in which the curvature radius (R) and/or the pitch (P) differ among predetermined directions within the plane in which the lens are arrayed. Using the LED illumination apparatus of such description, light exiting from the LED illumination devices is combined to form beamed light having an illumination region portion of a set width, and the beamed light is beamed onto the surface to be illuminated. It thereby becomes possible to fit an illumination shape having a set width onto the subject of illumination.