公开(公告)号：US11598947B2

公开(公告)日：2023-03-07

申请号：US17268085

申请日：2019-07-10

申请人： Sumita Optical Glass, Inc. ,  Dayong Li

发明人： Hiroki Watanabe ,  Morito Kanke ,  Shotaro Sano ,  Jun Otake ,  Dayong Li

IPC分类号： G02B23/24 ,  G02B7/02

摘要： A relay optical system 20 for a rigid endoscope includes a lens fixing frame 21 and a plurality of lenses 22. The lens fixing frame 21 has a plurality of tubular bodies 26. The plurality of tubular bodies 26 are joined coaxially to each other. The plurality of lenses 22 are located at positions other than a joint position jp of the tubular bodies 26 in an axis direction of the lens fixing frame 21. The plurality of lenses 22 are located in the lens fixing frame 21 so as to have a coincident optical axis. The plurality of lenses 22 do not include a cemented lens.