US 12,270,977 B2
Ultraviolet led optical member
Masutugu Tasaki, Saitama (JP); Yuta Ito, Saitama (JP); Takeru Kawaguchi, Saitama (JP); and Nobuyuki Tomizawa, Saitama (JP)
Assigned to ASAHI RUBBER INC., Saitama (JP)
Appl. No. 18/011,681
Filed by ASAHI RUBBER INC., Saitama (JP)
PCT Filed Sep. 17, 2021, PCT No. PCT/JP2021/034382
§ 371(c)(1), (2) Date Dec. 20, 2022,
PCT Pub. No. WO2022/075048, PCT Pub. Date Apr. 14, 2022.
Claims priority of application No. 2020-168700 (JP), filed on Oct. 5, 2020.
Prior Publication US 2023/0251477 A1, Aug. 10, 2023
Int. Cl. G02B 19/00 (2006.01); G02B 3/08 (2006.01)
CPC G02B 19/0061 (2013.01) [G02B 3/08 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An ultraviolet LED optical member, exhibiting optical characteristics of which an average transmittance at wavelengths from 200 to 300 nm is 50% or more by having an optical member made of an organic resin, wherein:
the organic resin is a condensation-polymerized silicone resin, and
the condensation-polymerized silicone resin has, among an M unit which is a monoorganosiloxy unit, a D unit which is a diorganosiloxy unit, a T unit which is a triorganosiloxy unit and a Q unit which is a siloxy unit, at least any of the T unit and the D unit.