US Patent 10443819 Lighting device, lighting device manufacturing method, and light distributor

A lighting device includes a light source and a light distributor disposed on a light emission side of the light source. The light distributor includes an entrance surface through which light enters and an exit surface through which the light that enters through the entrance surface exits. At least one of the entrance surface and the exit surface includes concave regions. Each of the concave regions includes a smooth concave surface. The concave regions control distribution of light from the light source that is refracted or reflected by an optical lens or a reflective component.