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AssigneesNGK Insulators, Ltd., NGK Optoceramics Co., Ltd.
InventorsMasashi Fukuyama, Kazutoshi Tohyama
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There is provided a glass substrate having a V-groove portion for arranging an optical fiber core and a countersunk portion for containing an optical fiber coated portion, formed on the extension of the V-groove portion, on the surface thereof. The surface roughness of an inside side face of the countersunk portion is 1 μm or less in Rmax, or 0.2 μm or less in Ra at least at the connecting portion of the V-groove portion and the countersunk portion. The glass substrate is manufactured by a two-stage molding method in which a first molding step for forming a concave portion in the surface of a glass substrate molded body by grinding or pressing, and a second molding step for pressing the glass substrate molded body obtained by the first molding step from the top and bottom surfaces while reheating the molded body are performed.
A glass substrate comprising:
A glass substrate comprising a V-groove portion for arranging an optical fiber core and a countersunk portion for containing an optical fiber coated portion, formed on an extension of said V-groove portion, on a surface thereof, wherein the surface roughness of an inside side face of said countersunk portion is 0.2 μm or less in Ra at least at a connecting portion of said V-groove portion and said countersunk portion.
A two-stage molding method for a glass substrate, comprising:
Dependencies are inferred from the claim text.