摘要 |
A glass spacer having no swell at the end portions and no constriction at the middle portion and designed grooves is manufactured by a heating and drawing method. The heat flux output of a line heater for heating a glass base material in a wide area opposed to the glass base material is 95 to 105% of the heat flux output of the center portion in the longitudinal direction of the heater, and the glass base material is heated and drawn with the line heater at a viscosity of 10<SUP>7.0 </SUP>P or more and less than 10<SUP>8.0 </SUP>P.
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