Abstract: A processing method for glass substrate of the present invention includes: applying heat and external force to a glass substrate and then cooling it down to thereby form a compression stressed part having a different etching rate from that of other parts with respect to an etching reagent to be used, on the surface of the glass substrate and in the vicinity thereof; and performing chemical etching using the etching reagent on the glass substrate having the compression stressed part formed thereon, so as to form a relief on the surface of the glass substrate.

Abstract: A glass substrate for a display, which is formed of a glass having a light weight and having high refinability with decreasing environmental burdens, the glass comprising, by mass %, 50 to 70% of SiO2, 5 to 18% of B2O3, 10 to 25% of Al2O3, 0 to 10% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 10% of BaO, 5 to 20% of RO (in which R is at least one member selected from the group consisting of Mg, Ca, Sr and Ba), and over 0.20% but not more than 2.0% of R?2O (in which R? is at least one member selected from the group consisting of Li, Na and K), and containing, by mass %, 0.05 to 1.5% of oxide of metal that changes in valence number in a molten glass, and substantially containing none of As2O3, Sb2O3 and PbO.

Abstract: The present invention improves a method of forming a surface unevenness using a difference in etching rates, and relaxes limitations on substrates in this method. In a method of the present invention, an uneven surface is formed by a method including applying pressure to a predetermined region in a surface of a thin film formed on a substrate, and etching a region including at least a portion of the predetermined region and at least a portion of the reminder of the surface that excludes the predetermined region. An etching rate difference within the thin film increases freedom in selecting a substrate material.

Abstract: A glass flake of the present invention has a composition that includes, in terms of mass %, 59?SiO2<65, 8?Al2O3?15, 47<(SiO2—Al2O3)?57, 1?MgO?5, 20?CaO?30, 0<(Li2O+Na2O+K2O)<2, and 0?TiO2?5 and that is substantially free from B2O3, F, ZnO, BaO, SrO, and ZrO2.

Abstract: The present invention provides a glass composition in which a smaller amount of arsenic oxide or antimony oxide that has a heavy burden on the environment is used and fewer bubbles remain. This glass composition includes, in terms of mass %: 40 to 70% of SiO2, 5 to 20% of B2O3, 10 to 25% of Al2O3, 0 to 5% of MgO (up to and not including 5%), 0 to 20% of CaO, 0 to 20% of SrO, 0 to 10% of BaO, 0 to 1.5% of Li2O, 0 to 1.5% of Na2O, 0 to 1.5% of K2O, and 0 to 1.5% of Cl. The sum of the contents of Li2O, Na2O, and K2O is 0.05 to 1.5 mass %, and the content of K2O is equal to or larger than that of Na2O.

Abstract: A processing method for glass substrate of the present invention includes: applying heat and external force to a glass substrate and then cooling it down to thereby form a compression stressed part having a different etching rate from that of other parts with respect to an etching reagent to be used, on the surface of the glass substrate and in the vicinity thereof, and performing chemical etching using the etching reagent on the glass substrate having the compression stressed part formed thereon, so as to form a relief on the surface of the glass substrate.

Abstract: A glass substrate of the present invention for magnetic recording media having high heat resistance and easy chemical strengthening ability at once has not been obtained, which is a glass composition essentially comprising 60 to 70 wt % SiO2, 5 to 20 wt % Al2O3, 0 to 1 wt % Li2O, 3 to 18 wt % Na2O, 0 to 9 wt % K2O, 0 to 10 wt % MgO, 1 to 15 wt % CaO, 0 to 4.5 wt % SrO, 0 to 1 wt % BaO, 0 to 1 wt % TiO2 and 0 to 1 wt % ZrO2, wherein the sum of Li2O, Na2O and K2O is from 5 to 25 wt %, and the sum of MgO, CaO, SrO and BaO is from 5 to 20 wt %.

Abstract: A glass substrate of the present invention for magnetic recording media having high heat resistance and easy chemical strengthening ability at once has not been obtained, which is a glass composition essentially comprising 60 to 70 wt % SiO2, 5 to 20 wt % Al2O3, 0 to 1 wt % Li2O, 3 to 18 wt % Na2O, 0 to 9 wt % K2O, 0 to 10 wt % MgO, 1 to 15 wt % CaO, 0 to 4.5 wt % SrO, 0 to 1 wt % BaO, 0 to 1 wt % TiO2 and 0 to 1 wt % ZrO2, wherein the sum of Li2O, Na2O and K2O is from 5 to 25 wt %, and the sum of MgO, CaO, SrO and BaO is from 5 to 20 wt %.

Abstract: The glass composition of the present invention includes the following components, expressed in mass%: 70% to 88% of SiO2; 6% to 18% of B2O3; 0.5% to 4.5% of Al2O3; 0% to 0.5% of Li2O; 0% to 0.5% of Na2O; 2% to 10% of K2O; and 0% to 2% of MgO+CaO+SrO+BaO, and the glass composition further includes chlorine (Cl). The glass composition of the present invention is used suitably as a glass substrate for an information display device.

Abstract: The present invention provides a glass flake that is substantially free of boron trioxide (B2O3), barium oxide (BaO), zinc oxide (ZnO), and fluorine (F) and has sufficient heat resistance and good formability for glass flake. The glass flake of the present invention includes a glass composition that contains the following components, expressed in mol %; 50?SiO2?65; 4?Al2O3<12; 5?SrO?25; 10<(MgO+SrO)?30; 20?(MgO+CaO+SrO)?45; and 0<(Li2O+Na2O+K2O)<2; wherein the glass composition is substantially free of B2O3, BaO, ZnO, and F. This glass flake is useful for resin compositions, paints, cosmetics, ink compositions, and the like.

Abstract: The present invention provides a glass composition that has excellent heat resistance and ion exchange ability and can be provided with high strength by a chemical strengthening treatment through an ion exchange. This glass composition includes, in terms of mass %: 59 to 68% of SiO2; 9.5 to 15% of Al2O3; 0 to 1% of Li2O; 3 to 18% of Na2O; 0 to 3.5% of K2O; 0 to 15% of MgO; 1 to 15% of CaO; 0 to 4.5% of SrO; 0 to 1% of BaO; 0 to 2% of TiO2; and 1 to 10% of ZrO2. The glass composition of the present invention is suitable for a glass substrate for magnetic recording media and also can be formed as a chemically strengthened glass article through an ion-exchange treatment.

Abstract: The present invention provides a glass substrate having a minute texture being provided on the surface and having good acid durability with high protrusion forming efficiency. According to the present invention, unevenness is formed on the surface by pressing a predetermined area of the surface of the glass substrate containing at least one oxide selected from the group consisting of SiO2, B2O3, P2O5, GeO2, As2O5, ZrO2, TiO2, SnO2, A2O3, MgO, and BeO and having a composition wherein the content of this at least one oxide is above 90 mol %, and subsequently by etching an area including this predetermined area. In the composition of this glass substrate, the ratio of oxides of network formers or intermediates is high, so that the glass substrate becomes easy to be compressed. This enables to obtain high protrusion forming efficiency even when selective leaching of a component easily leached into etchant is not employed, thereby satisfying acid durability as well.

Abstract: The present invention provides a glass sheet having both temperability and shapability. This glass sheet has a soda-lime silica composition including 13.5 wt % to 16.0 wt % of Na2O. When the glass sheet is heated and then is quenched rapidly to become a tempered glass, the tempered glass satisfies a formula of T2?T1?5, where T1 denotes a minimum heat-treatment temperature that is required for obtaining a tempered glass with a minimum number of fragments of at least 50, which is determined based on the method of fragmentation test for uniformly tempered glass according to ECE R43, while T2 denotes a maximum heat-treatment temperature that allows a tempered glass to be obtained, with the tempered glass permitting an angle of 25° or smaller to be formed between the normal orientation of a screen surface and the orientation of the surface of a glass sheet having a maximum optical distortion of not higher than 2.

Abstract: The present invention provides a glass sheet formed on molten tin, that exhibits a high transmittance that is originally inherent to its composition. In this glass sheet, the difference between a visible light reflectance of a surface formed in contact with the molten tin and a visible light reflectance of a surface on the opposite side thereof is not greater than 0.25%. And when the glass sheet's thickness is 4 mm, a light transmittance at 540 nm wavelength is at least 91.5%, and a light transmittance at 450 nm wavelength is at least 91.0%, and after irradiating UV light for 6 hours as specified in the radiation-proofing test according to JIS R3212, a light transmittance at 540 nm wavelength is at least 91.0% and a light transmittance at 450 nm wavelength is at least 90.5%.

Abstract: A high transmittance glass sheet is provided that is formed of a soda-lime-silica glass composition containing, expressed in wt. %, less than 0.020% of total iron oxide in terms of Fe2O3 and 0.006 to 2.0% of zinc oxide. The glass sheet allows the formation of nickel sulfide particles to be suppressed by the addition of a zinc compound to a glass raw material.

Abstract: Disclosed is a wireless communication apparatus for receiving a code-spread transmission signal. The wireless communication apparatus includes: an RF section; and a baseband section, wherein, in the baseband section, despreaders of an integral submultiple, which is 1/n1, of the number of chips of a spread code are arranged in parallel, and there is provided a propagation measurement section that measures a propagation channel by using the plurality of despreaders a plurality of times in a time-division manner and performing despread of each period corresponding to a chip rate of the spread code.

Abstract: The present invention provides a glass flake having sufficiently high visible-light absorptivity. The glass flake of the present invention includes a glass composition that contains a transition metal oxide such as an iron oxide and that allows the glass flake to have a visible-light transmittance of 85% or lower measured with an A light source when the glass flake has a thickness of 15 ?m. In this glass composition, it is preferable that the content of Fe2O3 (T-Fe2O3) in terms of the total iron satisfies the following formula, expressed in mass%: 10<T-Fe2O3?50.

Abstract: A processing method for glass substrate of the present invention includes: applying heat and external force to a glass substrate and then cooling it down to thereby form a compression stressed part having a different etching rate from that of other parts with respect to an etching reagent to be used, on the surface of the glass substrate and in the vicinity thereof, and performing chemical etching using the etching reagent on the glass substrate having the compression stressed part formed thereon, so as to form a relief on the surface of the glass substrate.

Abstract: A high transmittance glass sheet is provided that is formed of a soda-lime-silica glass composition containing, expressed in wt. %, less than 0.020% of total iron oxide in terms of Fe2O3 and 0.006 to 2.0% of zinc oxide. The glass sheet allows the formation of nickel sulfide particles to be suppressed by the addition of a zinc compound to a glass raw material.

Abstract: The present invention improves a method of forming a surface unevenness using a difference in etching rates, and relaxes limitations on substrates in this method. In a method of the present invention, an uneven surface is formed by a method including applying pressure to a predetermined region in a surface of a thin film formed on a substrate, and etching a region including at least a portion of the predetermined region and at least a portion of the reminder of the surface that excludes the predetermined region. An etching rate difference within the thin film increases freedom in selecting a substrate material.