US 12,066,681 B2
Lens unit
Yosuke Kanzaki, Nagano (JP); Toshio Shirotori, Nagano (JP); and Tadashi Komiyama, Nagano (JP)
Assigned to NIDEC SANKYO CORPORATION, Nagano (JP)
Appl. No. 17/439,791
Filed by NIDEC SANKYO CORPORATION, Nagano (JP)
PCT Filed Mar. 4, 2020, PCT No. PCT/JP2020/009184
§ 371(c)(1), (2) Date Sep. 15, 2021,
PCT Pub. No. WO2020/198285, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 2019-052249 (JP), filed on Mar. 20, 2019.
Prior Publication US 2022/0171151 A1, Jun. 2, 2022
Int. Cl. G02B 7/02 (2021.01); G02B 7/00 (2021.01); G03B 17/12 (2021.01)
CPC G02B 7/021 (2013.01) [G02B 7/008 (2013.01); G03B 17/12 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A lens unit, comprising:
a first lens group, disposed on an object side along an optical axis;
a second lens group, disposed on an image side along the optical axis with respect to the first lens group;
a diaphragm, disposed between the first lens group and the second lens group; and
a lens-barrel, configured to hold the first lens group, the diaphragm and the second lens group;
wherein an object side adjacent lens is disposed on a most image side in the first lens group and is adjacent to the diaphragm in a direction of the optical axis, and an image side adjacent lens is disposed on a most object side in the second lens group and is adjacent to the diaphragm in the direction of the optical axis, one of the object side adjacent lens and the image side adjacent lens is an one side lens made of glass, and the other of the object side adjacent lens and the image side adjacent lens is an other side lens made of resin material, and the lens-barrel is made of resin material which is different from that of the other side lens;
wherein the object side adjacent lens, the diaphragm and the image side adjacent lens are accommodated in a lens accommodation part provided in the lens-barrel;
wherein the one side lens is directly or indirectly abutted with an inner peripheral face of the lens accommodation part and thereby, a positional relationship between the lens-barrel and the one side lens in a direction perpendicular to the optical axis is fixed; and
wherein the other side lens is not contacted with the inner peripheral face and is engaged with the one side lens and thereby, a positional relationship between the one side lens and the other side lens in the direction perpendicular to the optical axis is fixed.