ALEXANDRIA, Va., April 15 -- United States Patent no. 12,601,905, issued on April 14, was assigned to FUJIFILM Corp. (Tokyo).
"Observation optical system and optical apparatus" was invented by Hiroki Saito (Saitama, Japan) and Shunsuke Miyagishima (Saitama, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An observation optical system includes a display element and an eyepiece lens arranged on an eyepoint side of the display element. The eyepiece lens includes at least one negative lens. In a case where a half value of a longest diameter of a display region in the display element is denoted by H, and a focal length of the eyepiece lens is denoted by f, the observation optical system satisfies a condition...