US 12,092,809 B2
Illumination optical system for endoscope
Yoshinori Morimoto, Kanagawa (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Feb. 14, 2022, as Appl. No. 17/670,679.
Application 17/670,679 is a continuation of application No. PCT/JP2020/028348, filed on Jul. 22, 2020.
Claims priority of application No. 2019-154577 (JP), filed on Aug. 27, 2019.
Prior Publication US 2022/0171178 A1, Jun. 2, 2022
Int. Cl. G02B 23/24 (2006.01); A61B 1/07 (2006.01); F21V 8/00 (2006.01)
CPC G02B 23/2469 (2013.01) [A61B 1/07 (2013.01); G02B 6/0008 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An illumination optical system for endoscope which is provided in contact with an end surface of a light guide at a distal end portion of an insertion part of an endoscope, the illumination optical system for endoscope comprising:
a diffusion plate that is provided on the end surface of the light guide and diffuses light from the light guide,
wherein the diffusion plate has a diffusion surface that is formed on a surface on a side of the light guide and a light guide unit that guides light diffused on the diffusion surface,
the diffusion surface consists of a holographic diffusion plate, and
the light guide unit consists of sapphire glass.