公开(公告)号：US12006242B2

公开(公告)日：2024-06-11

申请号：US17594885

申请日：2019-06-03

Applicant: Tosoh Quartz Corporation

Inventor： Chiemi Ito ,  Takeshi Mutou ,  Minoru Kuniyoshi ,  Mutsumi Asano ,  Atsushi Ando

IPC: B32B27/02 ,  B02C17/20 ,  C03B19/06 ,  C03B19/10

CPC classification number: C03B19/066 ,  B02C17/20 ,  C03B19/1005 ,  C03B2201/02

Abstract: A large sized opaque quartz glass ingot having an excellent heat ray shielding property, an outstanding light blocking property, high mechanical strength and small roughness of a baked finished smooth surface.
The shape of bubbles inside the quartz glass are almost complete spheres and the average particle size of the bubbles is 1 μm or less, such that the strength of the opaque quartz glass ingot is increased as the stress concentration at the edges of the bubbles is eliminated and an increase of surface roughness caused by baking is alleviated.