ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,535,196, issued on Jan. 27, was assigned to MINEBEA MITSUMI Inc. (Nagano, Japan).
"Planar illumination device" was invented by Ginga Ito (Kitasaku-gun, Japan) and Suguru Mukumoto (Kitasaku-gun, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A planar illumination device of an embodiment includes a substrate, a first optical element, and a second optical element. A plurality of light sources are two dimensionally disposed at the substrate. The first optical element is disposed at an emission side of the plurality of light sources, and condenses light emitted from the plurality of light sources. The second optical element inclines a light distributio...