US 12,256,892 B2
Optical system, method for manufacturing optical system, and endoscope
Takehiro Miki, Fuchu (JP)
Assigned to OLYMPUS CORPORATION, Tokyo (JP)
Filed by OLYMPUS CORPORATION, Tokyo (JP)
Filed on Apr. 28, 2022, as Appl. No. 17/731,516.
Application 17/731,516 is a continuation of application No. PCT/JP2019/043370, filed on Nov. 6, 2019.
Prior Publication US 2022/0248940 A1, Aug. 11, 2022
Int. Cl. A61B 1/00 (2006.01); G02B 3/00 (2006.01); G02B 13/00 (2006.01); G02B 23/24 (2006.01); G02B 23/26 (2006.01)
CPC A61B 1/00096 (2013.01) [G02B 3/0087 (2013.01); G02B 13/0095 (2013.01); G02B 23/2446 (2013.01); G02B 23/26 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An optical system comprising a plurality of lenses having refractive index distributions in which a refractive index changes in directions orthogonal to optical axes,
wherein the optical axes of the plurality of lenses are disposed on the same straight line,
wherein the plurality of lenses are manufactured on the basis of the same design values relating to an on-axis refractive index and a refractive index distribution constant, and
wherein, when rotation positions around the optical axes of the plurality of lenses at which a total aberration amount of the plurality of lenses reaches a maximum are set as reference rotation positions for the plurality of lenses, any one of the plurality of lenses is arranged at a position acquired by relatively rotating the reference rotation position around the optical axis.