US 11,988,818 B2
Imaging lens and imaging apparatus
Taiga Noda, Saitama (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Jul. 14, 2023, as Appl. No. 18/352,991.
Application 16/784,079 is a division of application No. 15/902,309, filed on Feb. 22, 2018, granted, now 10,591,702, issued on Mar. 17, 2020.
Application 18/352,991 is a continuation of application No. 17/817,307, filed on Aug. 3, 2022, granted, now 11,747,599.
Application 17/817,307 is a continuation of application No. 16/784,079, filed on Feb. 6, 2020, granted, now 11,442,253, issued on Sep. 13, 2022.
Claims priority of application No. 2017-038049 (JP), filed on Mar. 1, 2017.
Prior Publication US 2024/0027735 A1, Jan. 25, 2024
Int. Cl. G02B 13/00 (2006.01); G02B 7/04 (2021.01); G02B 9/64 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 7/04 (2013.01); G02B 9/64 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An imaging lens, comprising:
a first lens group having negative refractive power and being disposed at a position closest to an object side in the imaging lens, the first lens group consisting of a first-a negative lens as an uncemented negative meniscus lens of which an object side surface is convex, a first-b negative lens as an uncemented negative meniscus lens of which an object side surface is convex, and an uncemented positive meniscus lens of which an object side surface is convex, in this order from the object side to an image side;
an uncemented biconvex lens disposed adjacent to an image side of the first lens group;
a cemented lens, in which a positive meniscus lens, of which an image side surface is convex, and a negative meniscus lens, of which an image side surface is convex, are cemented in this order from the object side to the image side, the cemented lens being disposed closer to the image side than the uncemented biconvex lens; and
a negative lens, of which an object side surface is concave and a position of which remains stationary with respect to an image plane, which is disposed at a position closest to the image side in the imaging lens, wherein:
a lens positioned second from the image side in the imaging lens is a positive lens of which an image side surface is convex, and
the imaging lens is a fixed focal point optical system.