US 11,892,658 B2
Cemented lens, optical system including the same, optical apparatus, and method for manufacturing cemented lens
Masanobu Ogane, Yokohama (JP); Kenji Makino, Kawasaki (JP); and Norihiko Ochi, Kawasaki (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Aug. 5, 2019, as Appl. No. 16/531,551.
Claims priority of application No. 2018-149520 (JP), filed on Aug. 8, 2018.
Prior Publication US 2020/0049862 A1, Feb. 13, 2020
Int. Cl. G02B 3/00 (2006.01); G02B 1/10 (2015.01)
CPC G02B 3/0062 (2013.01) [G02B 1/10 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A cemented lens comprising:
a first optical element;
a second optical element;
a third optical element sandwiched between the first optical element and the second optical element, the third optical element containing resin;
a light shielding layer covering side surfaces of the first optical element, the second optical element, and the third optical element, and being disposed in contact with the third optical element; and
a porous layer covering at least a part of the light shielding layer,
wherein a thickness of the porous layer on the light shielding layer is 0.4 μm or more and 10 μm or less and the porous layer is configured to allow moisture contained in the third optical element and the light shielding layer to be emitted into atmosphere.