US Patent Issued to Nippon Electric Glass on July 28 for "Infrared imaging lens" (Japanese Inventors)

ALEXANDRIA, Va., July 28 -- United States Patent no. 12,693,504, issued on July 28, was assigned to Nippon Electric Glass Co. Ltd. (Otsu, Japan).

"Infrared imaging lens" was invented by Yoshimasa Matsushita (Otsu, Japan), Fumio Sato (Otsu, Japan) and Nobuo Hori (Higashimatsuyama, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a telephoto lens which is excellent in resolution. An infrared imaging lens (1) includes a first lens (L1), a second lens (L2), and a third lens (L3) each of which is made of chalcogenide glass having a refractive index of 2.5 to 4.0 measured at a wavelength of 10 micro metre, the infrared imaging lens (1) having a total system focal length not less than two times larg...