US 12,265,276 B2
Lens unit for preventing lens surface being clouded
Toshio Shirotori, Nagano (JP); and Akinori Yamamoto, Nagano (JP)
Assigned to NIDEC SANKYO CORPORATION, Nagano (JP)
Filed by NIDEC SANKYO CORPORATION, Nagano (JP)
Filed on Nov. 26, 2021, as Appl. No. 17/535,687.
Claims priority of application No. 2020-196622 (JP), filed on Nov. 27, 2020.
Prior Publication US 2022/0171152 A1, Jun. 2, 2022
Int. Cl. G02B 7/02 (2021.01); G02B 5/00 (2006.01); G02B 13/18 (2006.01)
CPC G02B 7/021 (2013.01) [G02B 5/003 (2013.01); G02B 13/18 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A lens unit comprising:
a first lens disposed on an object side in an optical axis direction;
a plurality of image-side lenses comprising a second lens facing the first lens on an image side in the optical axis direction and disposed on the image side with respect to the first lens;
a lens barrel holding the first lens and the plurality of image-side lenses radially inside, an optical axis being at a center of a radius;
a first sealing member to seal a gap between the first lens and the lens barrel; and
a second sealing member to seal a gap between an image side surface of the first lens and the lens barrel radially inside the first sealing member, wherein the lens barrel comprises:
a first communication path that connects a first space between the first sealing member and the second sealing member to an outside of the lens barrel; and
a second communication path that connects a second space between the first lens on a radial inside of the second sealing member and the second lens to the outside of the lens barrel;
wherein the first communication path is sealed with a third sealing member;
wherein the lens unit further comprises: a fourth sealing member that seals a gap between the second lens and the lens barrel radially inside the second sealing member.