US 12,326,610 B2
Imaging optical system, image capture device, and camera system
Yasuto Suzuki, Osaka (JP); Yoshiaki Kurioka, Osaka (JP); and Shunichiro Yoshinaga, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on May 23, 2022, as Appl. No. 17/750,878.
Claims priority of application No. 2021-089674 (JP), filed on May 28, 2021; and application No. 2022-048824 (JP), filed on Mar. 24, 2022.
Prior Publication US 2022/0382010 A1, Dec. 1, 2022
Int. Cl. G02B 7/04 (2021.01); G02B 9/64 (2006.01); G03B 3/10 (2021.01)
CPC G02B 7/04 (2013.01) [G02B 9/64 (2013.01); G03B 3/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An imaging optical system comprising:
a first lens group having positive power;
a second lens group having power; and
a third lens group having power,
the first lens group, the second lens group, and the third lens group being arranged in this order such that the first lens group is located closer to an object than any other lens group of the imaging optical system is,
the first lens group and the third lens group being configured not to move along an optical axis of the imaging optical system while the imaging optical system is focusing,
the second lens group including at least one lens LFN having negative power,
the at least one lens LFN being configured to move along the optical axis such that a first interval and a second interval change while the imaging optical system is focusing, the first interval being an interval on the optical axis between a surface, located closest to an image, of the first lens group and a surface, located closest to the object, of the second lens group, the second interval being an interval on the optical axis between a surface, located closest to the image, of the second lens group and a surface, located closest to the object, of the third lens group,
the first lens group including:
a sub-lens group G1A;
an aperture stop; and
a sub-lens group G1B,
the sub-lens group G1A, the aperture stop, and the sub-lens group G1B being arranged in this order such that the sub-lens group G1A is located closer to the object than any other component of the first lens group is,
the sub-lens group G1A including:
a lens L1A1; and
a lens L1A2 located adjacent to, and closer to the image than, the lens L1A1,
the lens L1A1 and the lens L1A2 being arranged in this order such that the lens L1A1 is located closer to the object than any other component, including the lens L1A2, of the sub-lens group G1A is,
an object-side surface of the lens L1A1 being convex toward the object,
the third lens group including:
a lens L3E having negative power; and
a lens L3P located adjacent to, and closer to the object than, the lens L3E,
the lens L3E and the lens L3P being arranged in this order such that the lens L3E is located closer to the image than any other component, including the lens L3P, of the third lens group is.