Method for manufacturing reinforced glass substrate and reinforced glass substrate

Abstract

According to the present invention, damage and breakage are prevented even when a sheet-shaped glass material after a chemical reinforcement is cut and fragmented through an etching treatment. A method for manufacturing a glass substrate of the present invention comprises chemical reinforcing in which the sheet-shaped glass material is chemically reinforced by means of an ion exchange treatment, and form processing in which the sheet-shaped glass material after the chemical reinforcing is cut by means of the etching treatment. In the chemical reinforcing, assuming that the plate thickness of the sheet-shaped glass material is t[[mu]m], the thickness of the compressive stress layer of the sheet-shaped glass material is d[[mu]m], the maximum compressive stress of the compressive stress layer is F[MPa], the integrated compressive stress value of the compressive stress layer is X[MPa[mu]m], the thickness of the tensile stress layer is t2[[mu]m], and the average tensile stress value of the tensile stress layer is Tave[MPa], and the ion exchange treatment is performed so as to satisfy 7=Tave2=t-2d, and Tave=X / t2 are satisfied.

Description

technical field [0001] The present invention relates to a method for producing a strengthened glass substrate and a strengthened glass substrate suitable for a cover glass for electronic devices such as portable devices (portable electronic devices). Background technique [0002] Display screens of electronic devices such as mobile phones and PDAs (Personal Digital Assistants) are protected by cover glass, such as liquid crystal panels and organic EL (Electro Luminescence) panels. As the cover glass, for example, tempered glass having a compressive stress layer formed on the surface layer can be used. Such a cover glass is produced, for example, in the following procedure. First, the sheet glass material is cut into predetermined shapes to obtain small pieces of glass substrates. Next, chemical strengthening is performed by immersing the fragmented glass substrate in molten salt. Thereafter, various functional films such as an antireflection film are formed on the surface...

AI Technical Summary

Problems solved by technology

[0004] However, the cutting of the plate glass material can be easily performed before the chemical strengthening treatment (that is, before the formation of the compressive stress layer). In contrast, when cutting plate glass materials, breakage, fracture, etc. are prone to occur

For example, it has been pointed out that when cutting air-cooled strengthened glass or chemically strengthened glass with a scribe line, the air-cooled strengthened glass will be pulverized into powder, and the chemically strengthened glass cannot be divided along the scribed line, or the scribed line The cut glass substrate breaks due to a load smaller than the assumed load (for example, refer to Patent Document 4)

Images