| 摘要 |
PROBLEM TO BE SOLVED: To produce a glass spacer having grooves formed as designed and having no blisters on the edges and no constriction in the center. SOLUTION: In a line heater 3 that heats a glass preform 1, the glass preform is heat-drawn under conditions in which the heat flux output in a wide region including a region in the glass preform 1 is 95 to 105% of the heat flux output in the center in the thickness direction, and the glass preform 1 is heated to a viscosity ranging from 10<SP>7.0</SP>P to below 10<SP>8.0</SP>P. COPYRIGHT: (C)2006,JPO&NCIPI
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