ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,557,973, issued on Feb. 24, was assigned to OLYMPUS Corp. (Tokyo).
"Optical unit, image pickup unit, and endoscope" was invented by Takahiro Shimono (Hachioji, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An objective optical unit includes: an observation optical system including a fixed lens and a moving lens; a fixed barrel holding the fixed lens; a moving lens barrel disposed in a coil holding barrel, holding a movable group lens, and moving in a direction along a photographing optical axis of the observation optical system; a first film formed on slide surfaces of the coil holding barrel and the moving lens barrel, the first film serving as ...