Patent · US Active

Composite silica glass made light diffusion member

US10222519B2 · kind B2 · utility

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4Claims
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Key dates

Filing dateMar 1, 2017
Grant dateMar 5, 2019
Priority date
Expiry dateAug 29, 2037

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B2207/109
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

A composite silica glass made light diffusion member includes a dense silica glass, and a porous silica glass which has been layered on the surface of the dense silica glass. The porous silica glass is a porous body and has a homogeneous pore distribution. The porous body has a framework including a plurality of spherical silica glasses, contains a communicating pore part formed by spaces among them, and has a central pore size of 10 to 20 μm and a porosity of 25 to 40%. The spherical silica glasses have an average diameter of 30 to 100 μm. An average value of a specific arithmetic average roughness Ra in each of the spherical silica glass exposed on an outer surface of the porous silica glass is 0.8 to 4.0 nm.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.