Cover glass and method for producing same
A technology for a glass cover sheet and a manufacturing method, which is applied to glass manufacturing equipment, manufacturing tools, glass molding, etc., can solve problems such as complicated processes, and achieve the effects of improving production efficiency, improving ion exchange performance, and excellent mechanical strength.
Active Publication Date: 2012-07-04
AVANSTRATE INC +1
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Problems solved by technology
In addition, new problems arise, such as complicated steps before the measurement.
Method used
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Embodiment
[0324] Hereinafter, examples of the cover glass of the present embodiment and its manufacturing method will be described in detail.
[0325] (manufacturing of glass substrates)
[0326] In order to form the glass compositions shown in Table 1 (Examples 1A to 42A) and Table 2 (Examples 1B to 24B) and Comparative Examples 1A, 2A, 1B to 4B, silica, which is a common glass raw material, Aluminum oxide, sodium carbonate, potassium carbonate, basic magnesium carbonate, lithium carbonate, calcium carbonate, zirconia, boria and / or clarifiers (such as tin oxide, sodium sulfate) to prepare glass raw materials (batch materials).
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Abstract
A cover glass having a compressive-stress layer on the principal surfaces thereof, and having a glass composition containing 50% to 70% by mole of SiO2, 3% to 20% by mole of Al2O3, 5% to 25% by mole of Na2O, more than 0% by mole and less than or equal to 2.5% by mole of Li2O, 0% to 5.5% by mole of K2O, and 0% to less than 3% by mole of B2O3. Also disclosed is a method for producing a cover glass which includes: (i) preparing molten glass by melting a glass raw material; (ii) forming the prepared molten glass into a plate-like shape by a down-draw process and thereby obtaining a glass substrate; and (iii) forming a compressive-stress layer on the surface of the glass substrate.
Description
technical field [0001] The invention relates to a cover glass and its manufacturing method. Background technique [0002] Conventionally, sheet glass has been used as a cover glass for protecting liquid crystal screens such as mobile phones, PDAs, digital cameras, and FPDs, or as a cover glass for housings of portable terminal devices. In recent years, these mobile phones, PDAs, and the like tend to be thinner and more functional, and require high mechanical strength. Therefore, tempered glass chemically strengthened for the strength of the thin glass substrate is used as a cover glass. [0003] Such tempered glass is chemically strengthened, for example, by ion exchange treatment. Ion exchange treatment is usually the following method: immerse the glass in a molten salt containing potassium and / or sodium at a temperature of about 350-550°C, so that the sodium ions and lithium ions on the glass surface and the potassium in the ion-exchange salt Ion or sodium ion exchange ...
Claims
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IPC IPC(8): C03C3/091C03B17/06C03B27/03C03C21/00
CPCC03C21/002C03C3/085Y10T428/315
Inventor 小山昭浩阿美谕桥本和明高野彻朗
Owner AVANSTRATE INC
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