Stock material or miscellaneous articles – Circular sheet or circular blank
Patent
1997-08-04
1999-06-29
Evans, Elizabeth
Stock material or miscellaneous articles
Circular sheet or circular blank
428410, 428426, 43027011, 65 3013, 65 3014, 65117, 369288, B32B 300, C03C 1500
Patent
active
059166568
ABSTRACT:
A glass substrate manufacturing method advantageously applicable to magnetic recording disk glass substrates, LCD glass substrates, photomasks glass substrates, or optical memory glass substrates. The method includes the steps of forming a film of a solution on at least a principal surface of a sheet glass formed using a down-drawing method, the solution containing a water soluble inorganic material and a surface-active agent; sandwiching both sides of a single sheet glass on which the film is formed or of a laminated structure of two or more sheet glasses with a densified sheet with a high flatness to pressure the single glass or laminated structure; and heating and annealing the single sheet glass or laminated structure to flatten the same. The end side of the flatten glass substrate is treated with a treating solution containing a hydrofluosilicic acid. The glass substrate is formed by chemically strengthening a glass substrate by immersing the glass substrate in a heated chemical reinforcement solution and then ion exchanging ions on the surface layer of the glass substrate with ions in the chemical reinforcement solution; removing the substrate form the chemical reinforcement solution and then annealing it to a temperature higher than the crystallization temperature of a molten salt; annealing the glass substrate at a rate at which the crystallization of the molten salt is deposited on the surface of the glass substrate; and then cleaning the surface of the glass substrate. Moreover, the glass substrate may be formed by chemically strengthening a glass substrate by immersing the glass substrate in a heated chemical reinforcement solution and then ion exchanging ions on the surface layer of the glass substrate with ions in the chemical reinforcement solution; and removing the substrate from the chemical reinforcement solution and then cleaning the surface of the glass substrate with a cleaning agent containing acid.
REFERENCES:
patent: 5654057 (1997-08-01), Kitayama et al.
Fujita Teruhisa
Kitayama Teruki
Kojima Tak
Murano Yoshio
Sekiguchi Kazuhiko
Evans Elizabeth
Hoya Corporation
Manzo Edward D.
Murphy Mark J.
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