US Patent Issued to Hitachi High-Tech on Dec. 2 for "Concave diffraction grating and optical device" (Japanese Inventors)

ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,487,383, issued on Dec. 2, was assigned to Hitachi High-Tech Corp. (Tokyo).

"Concave diffraction grating and optical device" was invented by Takanori Aono (Tokyo), Yoshisada Ebata (Tokyo), Kenta Yaegashi (Tokyo), Shigeru Matsui (Tokyo), Isao Uchida (Tokyo) and Jiro Yamamoto (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides a concave diffraction grating and an optical device using the concave diffraction grating, the concave diffraction grating being capable of preventing deformation of a reflection film due to the influence of temperature, and preventing deterioration in optical characteristic due to temperature. This c...