Method of forming conical shape on glass rod, and glass rod
AssigneeShin-Etsu Chemical Co., Ltd.
InventorTetsuya Otosaka
Life of this patent
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Abstract
In a method of forming a conical shape on a glass rod including an effective portion and an ineffective portion adjoining the effective portion to form a conical shape in the effective portion by simultaneously heating a boundary and the vicinity of the boundary between the effective portion and the ineffective portion and pulling an end of the ineffective portion, the temperature of a heater is raised and a heating target on the glass rod is simultaneously moved from the ineffective portion to the boundary.
Claims4
A method of forming a conical shape on a glass rod including an effective portion and an ineffective portion adjoining the effective portion at a boundary, the method comprising:
- providing a heater, and
- simultaneously raising the temperature of the heater and moving the glass rod so that the boundary between the effective portion and the ineffective portion is positioned inside the heater;
- stopping the movement of the glass rod when the boundary between the effective portion and the ineffective portion comes to a middle height of the heater;
- raising the temperature of the heater to a forming temperature for forming a conical shape while the movement of the glass rod is stopped;
- pulling an end of the ineffective portion and forming the conical shape while maintaining the temperature of the heater at the forming temperature for forming a conical shape and heating the boundary between the effective portion and the ineffective portion;
- and
- removing the ineffective portion from the effective portion by thermal cutting at the boundary.
Dependencies are inferred from the claim text.