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US 8,245,538 B2Granted
Glass substrate and a manufacturing method thereof
AssigneeNikon Corporation
InventorsYukiyasu Kimura, Yuhei Nitta
Life of this patent
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Abstract
A method for manufacturing a glass substrate by a fusion process includes flowing fused glass into a fusion pipe, and gradually cooling and solidifying the fused glass by allowing the glass to flow downward from the fusion pipe. An asperity is formed on a surface of the glass substrate by fastening and pressing the glass toward a direction of thickness of the glass with a pair of transfer rollers while the glass is flowing down from the fusion pipe.
Claims5
A method for manufacturing a glass substrate for a flat panel display by fusion process, the method comprising:
- flowing fused glass into a fusion pipe;
- overflowing the fused glass toward two directions of the fusion pipe and flowing the fused glass along two side surfaces of the fusion pipe;
- joining the fused glass at a blade portion which is a bottom end of the fusion pipe;
- gradually cooling and solidifying the fused glass by flowing downward from the blade portion;
- and
- forming an asperity on a surface of the glass substrate by controlling heaters which are installed inside the fusion pipe to maintain a temperature on the surfaces of the fusion pipe in a glass fusing state, and to generate periodic temperature differences between the two side surfaces of the fusion pipe,
- wherein the periodic temperature differences between the two side surfaces of the fusion pipe produce periodic flow rate differences along the two side surfaces of the fusion pipe.
4 more elements
Dependencies are inferred from the claim text.