US 11,899,278 B2
Imaging lens and imaging apparatus
Ora Matsuoka, Tokyo (JP); Naoki Miyagawa, Kanagawa (JP); and Hiroyuki Matsumoto, Tokyo (JP)
Assigned to Sony Group Corporation, Tokyo (JP)
Appl. No. 17/040,957
Filed by Sony Corporation, Tokyo (JP)
PCT Filed Feb. 4, 2019, PCT No. PCT/JP2019/003857
§ 371(c)(1), (2) Date Sep. 23, 2020,
PCT Pub. No. WO2019/187633, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 2018-067276 (JP), filed on Mar. 30, 2018.
Prior Publication US 2021/0026105 A1, Jan. 28, 2021
Int. Cl. G02B 9/00 (2006.01); G02B 9/34 (2006.01); G02B 9/60 (2006.01); G02B 13/18 (2006.01); G02B 27/00 (2006.01)
CPC G02B 9/34 (2013.01) [G02B 9/60 (2013.01); G02B 13/18 (2013.01); G02B 27/0025 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An imaging lens comprising:
a first lens group always fixed and having positive refractive power, and a first focus lens group that moves in an optical axis direction at a time of focusing from an object at infinity to an object at close range, in order from an object side to an image side;
a last lens group always fixed and having negative refractive power, and a second focus lens group that moves in an optical axis direction at a time of focusing from an object at infinity to an object at close range, in order from the image side to the object side,
at least one of the first focus lens group or the second focus lens group having negative refractive power; and
an aperture stop disposed between the first focus lens group and the second focus lens group,
the imaging lens satisfying Conditional Expression (1) below:
0.4<f/ff<1.0  (1)
where
f: a focal length of a whole system
ff: a combined focal length of the first lens group and the first focus lens group, wherein
the first focus lens group comprises an object-side lens component having negative refractive power and an image-side lens component having negative refractive power, and
the object-side lens component is formed by a cemented lens comprising a positive lens located on the object side and a negative lens located on the image side.