Glass substrate and two-stage molding method therefor
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United States of America Patent
Stats
-
Nov 20, 2001
Grant Date -
N/A
app pub date -
Mar 26, 1999
filing date -
Mar 31, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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 .mu.m or less in Rmax, or 0.2 .mu.m 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.
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