# US 9,039,170 B2 · System and method for manufacturing a lens, such as an ophthalmic lens > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,170 B2 - Document ID: US9039170B2 - Status: Granted - Kind: B2 - Application number: 13/212,100 - Filed: 2011-08-17 - Published: 2011-12-15 - Granted: 2015-05-26 - Earliest claimed: 2007-10-30 - Assignees: Digital Vision, Inc. - Applicants: Stan Arrigotti; Gordon Keane - Inventors: Stan Arrigotti; Gordon Keane - Web page: https://patentgrep.com/patent/US9039170B2 ## CPC - B24B 13/00: Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor (edging optical work, e.g. lenses, prisms B24B9/14) - B24B 1/00: Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes - B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS ## Abstract A system and method for manufacturing an ophthalmic lens is described. In some examples, the system applies a back surface to a lens blank that includes an aspherical curve having two radii of curvature. In some examples, a back surface of a peripheral portion of the lens follows the curvature of a front surface of the lens in order to establish a rounded, non-sharp edge to a lens blank used during the manufacturing process of a prescription eyeglass lens. ## Claims ### Claim 1 A lens blank for use in manufacturing a lens, comprising: a center section, wherein the center section includes a front surface having a front curvature and a back surface having a center back curvature that combine to establish a prescription power applied to the lens; and a peripheral section at least partially surrounding the center section, wherein the peripheral section includes a front surface having the front curvature and a back surface having a peripheral back curvature, wherein the peripheral section extends through an entire peripheral thickness of the lens, wherein the peripheral back curvature is different from the center back curvature, and wherein the front surface of the peripheral section does not intersect the back surface of the peripheral section, wherein after processing of the lens blank, the entire peripheral section of the lens blank is removed to form the lens that fits in an eyeglass frame. ### Claim 2 (depends on 1) The lens blank of claim 1, wherein the front curvature has a radius of curvature that is substantially similar to a radius of curvature of the peripheral back curvature. ### Claim 3 (depends on 1) The lens blank of claim 1, wherein the prescription power is positive, and the peripheral back curvature has a radius of curvature that is greater than a radius of curvature of the center back curvature. ### Claim 4 (depends on 1) The lens blank of claim 1, wherein the prescription power is negative, and the peripheral back curvature has a radius of curvature that is smaller than a radius of curvature of the center back curvature. ### Claim 5 (depends on 1) The lens blank of claim 1, wherein the prescription power is positive and the peripheral section has a minimum thickness. ### Claim 6 (depends on 1) The lens blank of claim 1, wherein the prescription power is negative and the peripheral section has a maximum thickness. ### Claim 7 An unfinished lens for use in manufacturing a positive power lens, the lens comprising: a front surface; and a back surface, wherein a front curvature of the front surface and a center back curvature of the back surface within a central section of the unfinished lens together establish a prescribed positive power for the lens, and wherein a peripheral back curvature of the back surface within a peripheral section of the unfinished lens is different from the center back curvature, wherein the front surface and back surface do not intersect, and wherein the peripheral section of the unfinished lens has a minimum thickness, wherein the peripheral section extends through an entire thickness of a peripheral edge of the central section of the unfinished lens, and further wherein after processing of the unfinished lens, the entire peripheral section of the unfinished lens is removed to form the lens that fits in an eyeglass frame. ### Claim 8 (depends on 7) The unfinished lens of claim 7, wherein the front curvature of the front surface is a spherical curve. ### Claim 9 (depends on 7) The unfinished lens of claim 7, wherein the front curvature of the front surface is an aspherical curve. ### Claim 10 (depends on 7) The unfinished lens of claim 7, wherein the center back curvature of the back surface is a spherical curve. ### Claim 11 (depends on 7) The unfinished lens of claim 7, wherein the center back curvature of the back surface is an aspherical curve. ### Claim 12 (depends on 7) The unfinished lens of claim 7, wherein the front curvature has a radius of curvature that is substantially similar to a radius of curvature of the peripheral back curvature. ### Claim 13 (depends on 7) The unfinished lens of claim 7, wherein the peripheral back curvature has a radius of curvature that is greater than a radius of curvature of the center back curvature. ### Claim 14 A lens for use in manufacturing a negative power lens, the lens comprising: a front surface; and a back surface, wherein a front curvature of the front surface and a center back curvature of the back surface within a central section of the lens together establish a prescribed negative power for the lens, and wherein a peripheral back curvature of the back surface within a peripheral section of the lens is different from the center back curvature, wherein the front surface and back surface do not intersect, wherein the peripheral section of the lens has a maximum thickness, wherein the peripheral section extends through an entire thickness of a peripheral edge of the central section of the lens, and further wherein after processing of the lens, the entire peripheral section of the lens is removed to form the lens that fits in an eyeglass frame. ### Claim 15 (depends on 14) The lens of claim 14, wherein the front curvature of the front surface is a spherical curve. ### Claim 16 (depends on 14) The lens of claim 14, wherein the front curvature of the front surface is an aspherical curve. ### Claim 17 (depends on 14) The lens of claim 14, wherein the center back curvature of the back surface is a spherical curve. ### Claim 18 (depends on 14) The lens of claim 14, wherein the center back curvature of the back surface is an aspherical curve. ### Claim 19 (depends on 14) The lens of claim 14, wherein the front curvature has a radius of curvature that is substantially similar to a radius of curvature of the peripheral back curvature. ### Claim 20 (depends on 14) The lens of claim 14, wherein the peripheral back curvature has a radius of curvature that is less than a radius of curvature of the center back curvature.