# US 10,766,222 B2 · Glass substrate and method for manufacturing the same, cover glass and method for manufacturing the same, personal digital assistant, and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,766,222 B2 - Document ID: US10766222B2 - Status: Granted - Kind: B2 - Application number: 16/395,322 - Filed: 2019-04-26 - Published: 2019-08-15 - Granted: 2020-09-08 - Earliest claimed: 2015-06-05 - Assignees: AGC Inc. - Applicants: AGC Inc. - Inventors: Masao Ozeki; Masahiko Tada; Makoto Sano; Osami Taito - Web page: https://patentgrep.com/patent/US10766222B2 ## CPC - B32B 3/02: characterised by features of form at particular places, e.g. in edge regions {(non-uniform thickness B32B3/263)} - B32B 17/06: comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} - C03C 15/00: Surface treatment of glass, not in the form of fibres or filaments, by etching (etching or surface-brightening compositions, in general C09K13/00) - B32B 2307/412: Transparent - B32B 2457/208: Touch screens - C03C 3/076: with 40% to 90% silica, by weight {(C03C3/045 takes precedence)} - C03C 3/078: containing an oxide of a divalent metal, e.g. an oxide of zinc - C03C 3/085: containing an oxide of a divalent metal - C03C 17/00: Surface treatment of glass, not in the form of fibres or filaments, by coating (optical coatings of optical elements G02B1/10) - C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)} - C03C 2218/119: by printing - G06F 3/0433: {in which the acoustic waves are either generated by a movable member and propagated within a surface layer or propagated within a surface layer and captured by a movable member} - G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices - H04M 1/0266: {for a display module assembly} - H04M 2250/12: including a sensor for measuring a physical value, e.g. temperature or motion - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) ## Abstract In a glass substrate for extracting therefrom a plurality of cover glasses to protect a protection object, plural concave portions are provided in a front surface or back surface of the glass substrate. The glass substrate includes plural thin portions formed by providing the plural concave portions and a thick portion connecting to the thin portion, and a haze value of the thin portion is 8% or less. ## Claims ### Claim 1 A cover glass to protect a protection object, wherein: at least one concave portion is provided in a front surface or back surface of the cover glass, the cover glass comprises a thin portion formed by providing the concave portion and a thick portion connecting to the thin portion, an anti-glare treated layer is included in at least a part of a surface of the cover glass, a refractive index of the anti-glare treated layer is smaller than that of a center part of the thick portion in a thickness direction of the cover glass in a section view, and a haze value of the thin portion is 8% or less. ### Claim 2 (depends on 1) The cover glass according to claim 1, wherein an arithmetic mean roughness of a front surface of the thin portion is 50 nm or less. ### Claim 3 (depends on 1) The cover glass according to claim 1, wherein a layer containing fluorine or chlorine is included in the outermost surface of the concave portion. ### Claim 4 (depends on 1) The cover glass according to claim 1, wherein the outermost surface of the front surface or back surface has a concentration of a potassium ion higher than a concentration of a potassium ion in a center part of the thick portion in a thickness direction in a section view thereof. ### Claim 5 (depends on 1) The cover glass according to claim 1, wherein the front surface or back surface is a polished surface. ### Claim 6 (depends on 5) The cover glass according to claim 5, wherein the polished surface is formed in a chemically strengthened layer. ### Claim 7 (depends on 1) The cover glass according to claim 1, wherein a layer containing fluorine or chlorine is included in the outermost surface of the anti-glare treated layer. ### Claim 8 (depends on 1) The cover glass according to claim 1, further comprising an anti-fingerprint layer in at least a part of the front surface of the cover glass and wherein the anti-fingerprint layer is included only in the thick portion. ### Claim 9 (depends on 1) The cover glass according to claim 1, wherein a side surface of the concave portion is in a curved shape smoothly connecting to a bottom of the concave portion and, wherein a radius of curvature of the side surface is not less than a depth of the bottom. ### Claim 10 (depends on 1) The cover glass according to claim 1, wherein a side surface of the concave portion is in a curved shape smoothly connecting to a bottom of the concave portion and wherein a radius of curvature of the side surface is less than a depth of the bottom. ### Claim 11 (depends on 1) The cover glass according to claim 1, wherein a side surface of the concave portion is in a curved shape smoothly connecting to a bottom of the concave portion and wherein a radius of curvature of the side surface increases from a center part of the concave portion toward a peripheral part of the concave portion. ### Claim 12 (depends on 1) The cover glass according to claim 1, wherein a side surface of the concave portion is in a curved shape smoothly connecting to a bottom of the concave portion and wherein a radius of curvature of the side surface decreases from a center part of the concave portion toward a peripheral part of the concave portion. ### Claim 13 (depends on 1) The cover glass according to claim 1, wherein a side surface of the concave portion is in a curved shape smoothly connecting to a bottom of the concave portion and a radius of curvature of the side surface is 0.1 mm or more and 2 mm or less. ### Claim 14 (depends on 1) The cover glass according to claim 1, wherein a printing layer is included on the back surface of the cover glass. ### Claim 15 (depends on 1) The cover glass according to claim 1, wherein the protection object is a personal digital assistant. ### Claim 16 (depends on 1) The cover glass according to claim 1, wherein the protection object is a display panel. ### Claim 17 (depends on 1) The cover glass according to claim 1, wherein the protection object comprises a sensor. ### Claim 18 A cover glass to protect a protection object, wherein: at least one concave portion is provided in a back surface of the cover glass, the cover glass comprises a thin portion formed by providing the concave portion and a thick portion connecting to the thin portion, a haze value of the thin portion is 8% or less, a printing layer is provided in the back surface of the cover glass, and the printing layer provided in the concave portion and the printing layer provided in the flat part not having the concave portion are different in a printing color or a printing texture. ### Claim 19 A cover glass to protect a protection object, wherein: at least one concave portion is provided in a back surface of the cover glass, the cover glass comprises a thin portion formed by providing the concave portion and a thick portion connecting to the thin portion, a haze value of the thin portion is 8% or less, a printing layer is provided in the back surface of the cover glass, and the printing layer provided in a peripheral part of the concave portion is thicker than the printing layer provided in the thick portion.