Shin-Etsu Quartz Products Co., Ltd.

Yuya Yokosawa

Akira Sato

Tatsuya Mori

Akira Fujinoki

Hiroyuki Nishimura

Nobumasa Yoshida

Atsushi Shimada

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.

Quartz glass plate

Provided is a silica glass member for hermetic sealing of an ultraviolet SMD LED element to be suitably used for hermetic sealing of, and as a transmission window material for, a surface mount-type package (SMD) having an ultraviolet LED mounted thereon and configured to emit ultraviolet light in a wavelength range of from 200 nm to 350 nm. The silica glass member for hermetic sealing includes a silica glass substrate, which is homogeneously and integrally formed without an internal boundary, wherein the silica glass substrate has: a first surface on an inside opposed to an SMD LED element; and a second surface on an outside corresponding to the first surface, wherein an outer peripheral portion of the first surface has formed therein a substrate joining plain surface for joining to the container outer periphery joining plain surface, and wherein the second surface on the outside corresponding to the first surface has formed therein a lens-like convex portion configured to process emitted light from the ultraviolet SMD LED element.

Silica glass member for hermetic sealing of ultraviolet SMD LED element and method for manufacturing quartz glass member for ultraviolet led

Provided are a sizing agent for quartz glass fibers capable of suppressing charging of quartz glass fibers, and suppressing generation of fluff in a production process for quartz glass fibers and a weaving process for a quartz glass cloth, a quartz glass fiber or a quartz glass yarn having applied thereonto the sizing agent, a quartz glass cloth, a prepreg for a printed circuit board, and a product using the quartz glass fiber. The sizing agent for quartz glass fibers includes an aqueous solution containing: a cationic vinyl acetate copolymer emulsion in which a cationic vinyl acetate copolymer having a weight average molecular weight of from 5,000 to 500,000 is dispersed in water; and starch, in which emulsion particles of the cationic vinyl acetate copolymer emulsion have a 50% diameter on a volume basis of from 0.1 &#x3bc;m to 5 &#x3bc;m.

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Koriyama, Japan

Yuya Yokosawa