US 12,264,962 B2
Cover for infrared sensor and method of manufacturing cover for infrared sensor
Kinji Furukawa, Kiyosu (JP); Kazuyoshi Fujimoto, Kiyosu (JP); Yosuke Maruoka, Kiyosu (JP); and Yasuhiro Miyajima, Kiyosu (JP)
Assigned to TOYODA GOSEI CO., LTD., Aichi-pref. (JP)
Appl. No. 17/908,397
Filed by TOYODA GOSEI CO., LTD., Kiyosu (JP)
PCT Filed Mar. 24, 2021, PCT No. PCT/JP2021/012403
§ 371(c)(1), (2) Date Aug. 31, 2022,
PCT Pub. No. WO2021/193769, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2020-057717 (JP), filed on Mar. 27, 2020.
Prior Publication US 2023/0104850 A1, Apr. 6, 2023
Int. Cl. G01J 1/02 (2006.01); B32B 27/00 (2006.01); G01J 1/04 (2006.01); G01J 5/04 (2006.01); G01J 5/08 (2022.01); G01J 5/0875 (2022.01); G02B 5/22 (2006.01)
CPC G01J 1/0271 (2013.01) [B32B 27/00 (2013.01); G01J 1/0252 (2013.01); G01J 1/0407 (2013.01); G01J 5/046 (2013.01); G01J 5/0875 (2013.01); G02B 5/22 (2013.01)] 3 Claims
OG exemplary drawing
 
1. An infrared sensor cover that allows for passage of infrared rays emitted from an infrared sensor, the infrared sensor cover comprising:
a decorative layer including a first surface and a second surface opposite the first surface;
a transparent first base made of a resin molded body and disposed on the first surface of the decorative layer; and
a transparent second base made of a resin molded body and disposed on the second surface of the decorative layer, wherein
an absolute value of a difference between a refractive index of a first resin material of the first base and a refractive index of a second resin material of the second base is less than or equal to 0.05,
an absolute value of a difference between a heat deflection temperature of the first resin material and a heat deflection temperature of the second resin material is greater than or equal to 15 degrees,
the first resin material is polycarbonate of bisphenol A having a single structure or a copolymerized polycarbonate of bisphenol A and imide monomer, and
the second resin material is a copolymerized polycarbonate of bisphenol A and aliphatic monomer or a copolymerized polycarbonate of bisphenol A and ester monomer.