Nippon Electric Glass Co., Ltd.

Koichi Yabuuchi

Toru Shiragami

Takuji Oka

Syunsuke Fujita

Provided are an airtight package that can increase the bonding strength between the sealing material layer and the container and a method for manufacturing the same. An airtight packageincludes: a containerwith a frame; a glass liddisposed on top of the frameand sealing the container; and a sealing material layerdisposed between the frameand the glass lidand bonding the glass lidand the containertogether, wherein in the sealing material layera bonding surfacebetween the sealing material layerand the containeris larger than a bonding surfacebetween the sealing material layerand the glass lid

Airtight package and method for manufacturing same

The present invention provides a glass having a refractive index and a coefficient of thermal expansion close to those of quartz glass, respectively, and also having anti-devitrification properties excellent enough to avoid the development of defects such as devitrification on the glass surface even when it is molded by drawing process or reheat forming, more specifically an optical glass for use in optical communication devices, particularly an optical glass for use in a stub. The optical glass of the invention is composed of a borosilicate glass having a refractive index of from 1.44 to 1.46, a coefficient of thermal expansion of from 10&#xd7;10to 50&#xd7;10/&#xb0; C., and a liquidus viscosity of 10dPa&#xb7;s or more.

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Otsu, Japan

Koichi Yabuuchi