US 11,987,529 B2
Light shielding member
Satoshi Kiyota, Higashiomi (JP); Kazuo Watada, Koka (JP); Takehisa Higa, Moriyama (JP); Masamichi Shingu, Shiga (JP); and Kunihide Shikata, Omihachiman (JP)
Assigned to KYOCERA Corporation, Kyoto (JP)
Appl. No. 17/266,032
Filed by KYOCERA Corporation, Kyoto (JP)
PCT Filed Aug. 6, 2019, PCT No. PCT/JP2019/030931
§ 371(c)(1), (2) Date Feb. 4, 2021,
PCT Pub. No. WO2020/032034, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. 2018-149442 (JP), filed on Aug. 8, 2018.
Prior Publication US 2021/0292239 A1, Sep. 23, 2021
Int. Cl. C04B 35/10 (2006.01); G02B 5/00 (2006.01); F21S 41/40 (2018.01); G01J 5/06 (2022.01)
CPC C04B 35/10 (2013.01) [G02B 5/003 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/3237 (2013.01); C04B 2235/3241 (2013.01); C04B 2235/3262 (2013.01); C04B 2235/3272 (2013.01); C04B 2235/3275 (2013.01); C04B 2235/3279 (2013.01); C04B 2235/9661 (2013.01); F21S 41/40 (2018.01); G01J 5/06 (2013.01); G01J 2005/065 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A light shielding member, disposed around an optical element to block unnecessary light and comprising an aluminum oxide ceramics comprising an oxide of titanium whose composition formula is shown as TiO2-x (1≤x<2),
wherein
a total content of Fe, Ni, Co, Mn and Cr is 86 mass ppm or more and 260 mass ppm or less,
TiO2-x is 1.5% by mass or more and 1.7% by mass or less,
a maximum value Rmax of a reflectance of a region in a wavelength of 250 nm to 2500 nm is 14.56% or more and 22.44% or less, and
a difference ΔR between the maximum value Rmax and a minimum value Rmin of the reflectance of the region in the wavelength of 250 nm to 2500 nm is 6.18% or more and 13.68% or less.