US 12,189,210 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)
Filed by Sony Group Corporation, Tokyo (JP)
Filed on Oct. 31, 2023, as Appl. No. 18/498,662.
Application 18/498,662 is a division of application No. 17/040,957, granted, now 11,899,278, previously published as PCT/JP2019/003857, filed on Feb. 4, 2019.
Claims priority of application No. 2018-067276 (JP), filed on Mar. 30, 2018.
Prior Publication US 2024/0061211 A1, Feb. 22, 2024
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)] 6 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 from an object side to an image side in an optical axis direction at a time of focusing from an object at infinity to an object at close range, includes at least one positive lens, and has negative refractive power, in order from the object side to the image side;
a last lens group always fixed and having negative refractive power, and a second focus lens group that moves from the image side to the object side in an optical axis direction at a time of focusing from an object at infinity to an object at close range, and has positive refractive power, in order from the image side to the object side; and
an aperture stop disposed between the first focus lens group and the second focus lens group,
the imaging lens satisfying Conditional Expressions (2) and (3) below:
νF1<22  (2)
0.63<θgF  (3)
where
νF1: the Abbe number for the d-line of the positive lens of the first focus lens group
θgF: a partial dispersion ratio of the positive lens of the first focus lens group.