Back to results
US 11,987,529 B2Granted
Light shielding member
AssigneeKYOCERA Corporation
InventorsSatoshi Kiyota, Kazuo Watada, Takehisa Higa, Masamichi Shingu, Kunihide Shikata
Life of this patent
Estimating the term…
Abstract
The light shielding member of the present disclosure includes an aluminum oxide ceramics including an oxide of titanium whose composition formula is shown as TiO2-x (1≤x<2), and a total content of Fe, Ni, Co, Mn and Cr is 260 mass ppm or less.
Claims3
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.
2 more elements
Dependencies are inferred from the claim text.