US 12,189,140 B2
Lens structure and optical connection structure
Jun Endo, Tokyo (JP); Kota Shikama, Tokyo (JP); and Atsushi Aratake, Tokyo (JP)
Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (JP)
Appl. No. 17/430,799
Filed by Nippon Telegraph and Telephone Corporation, Tokyo (JP)
PCT Filed Jan. 31, 2020, PCT No. PCT/JP2020/003697
§ 371(c)(1), (2) Date Aug. 13, 2021,
PCT Pub. No. WO2020/166386, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 2019-025401 (JP), filed on Feb. 15, 2019.
Prior Publication US 2022/0075100 A1, Mar. 10, 2022
Int. Cl. G02B 3/04 (2006.01); G02B 6/30 (2006.01); G02B 6/32 (2006.01)
CPC G02B 3/04 (2013.01) [G02B 6/305 (2013.01); G02B 6/32 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A lens structure body comprising:
a lens portion having a first refraction surface on an illuminant side and a second refraction surface on an emission side so as to be opposed to the first refraction surface, wherein:
the first refraction surface satisfies

OG Complex Work Unit Math
 and
the second refraction surface satisfies

OG Complex Work Unit Math
in which z represents a coordinate in a light propagation direction, y represents a coordinate in a height direction perpendicular to an optical axis of the lens portion, D represents a size of the lens portion in a height direction, la represents a distance from a predetermined origin to an end of the first refraction surface in the light propagation direction, t represents a distance from the end of the first refraction surface to an end of the second refraction surface in the light propagation direction, ra1 represents a radius of the first refraction surface in the height direction, rb1 represents the radius of the first refraction surface in the light propagation direction, ra2 represents a radius of the second refraction surface in the height direction, and rb2 represents the radius of the second refraction surface in the light propagation direction.