Quartz glass plate
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United States of America Patent
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Mar 12, 2024
Grant Date -
Jun 10, 2021
app pub date -
Mar 25, 2019
filing date -
Apr 18, 2018
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Abstract
A quartz glass plate has a quartz glass plate body and a quartz glass member adhered to the quartz glass plate body through an adhesive layer, where the adhesive layer contains silica, and a sum of concentrations of Li, Na, and K ions, being alkali metal ions and Ca ions, being alkaline earth metal ions contained in the adhesive layer is 10 ppm by mass or less. Consequently, a step with a uniform thickness can be formed, and a quartz glass plate is not easily damaged by irradiation with a light containing an ultraviolet ray.
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