US 12,422,653 B2
Lens apparatus and image pickup apparatus
Kei Sugiyama, Tochigi (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Nov. 14, 2022, as Appl. No. 17/985,981.
Claims priority of application No. 2021-187560 (JP), filed on Nov. 18, 2021.
Prior Publication US 2023/0152559 A1, May 18, 2023
Int. Cl. G02B 15/14 (2006.01); G02B 13/00 (2006.01); G02B 15/15 (2006.01); G02B 15/16 (2006.01); G02B 27/64 (2006.01); G02B 30/26 (2020.01); H04N 23/55 (2023.01)
CPC G02B 15/143105 (2019.08) [G02B 13/0065 (2013.01); G02B 13/009 (2013.01); G02B 15/144113 (2019.08); G02B 15/15 (2013.01); G02B 15/16 (2013.01); G02B 30/26 (2020.01); H04N 23/55 (2023.01); G02B 27/646 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A lens apparatus comprising two optical systems,
wherein each of the two optical systems includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a first reflective surface, a second reflective surface, and a rear lens unit having positive refractive power,
wherein at least a distance between the first lens unit and the second lens unit and a distance between the second lens unit and the first reflective surface are changed during magnification variation, and
wherein the following inequality is satisfied:
0.05<Dout/Din<0.50
0.50<f1/fw<3.57
where Din is a distance between surface vertices of lenses disposed closest to the object side in each of the two optical systems, Dout is a distance between surface vertices of lenses disposed closest to the image side in each of the two optical systems, f1 is a focal length of the first lens unit, and fw is a focal length at a wide-angle end of the optical system.