# US 10,120,518 B2 · Touch panel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,120,518 B2 - Document ID: US10120518B2 - Status: Granted - Kind: B2 - Application number: 15/379,588 - Filed: 2016-12-15 - Published: 2017-04-06 - Granted: 2018-11-06 - Earliest claimed: 2014-07-02 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Masamichi Ando; Kenichi Mori - Web page: https://patentgrep.com/patent/US10120518B2 ## CPC - B32B 25/08: of synthetic resin - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - B32B 25/12: comprising natural rubber - B32B 25/20: comprising silicone rubber - B32B 27/08: of synthetic resin - B32B 27/18: characterised by the use of special additives - B32B 27/283: {comprising polysiloxanes} - B32B 27/308: {comprising acrylic (co)polymers} - B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} - B32B 27/36: comprising polyesters - B32B 27/365: {comprising polycarbonates} - G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer} - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - B32B 2250/44: Number of layers variable across the laminate - B32B 2307/20: having particular electrical or magnetic properties, e.g. piezoelectric - B32B 2307/412: Transparent - B32B 2307/516: mono-axially - B32B 2307/704: Crystalline - B32B 2307/732: Dimensional properties - B32B 2457/208: Touch screens - G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices - G06F 2203/04105: Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position - G06F 2203/04106: Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A touch panel that includes a plate member which includes a first principal surface and a second principal surface opposing each other, and is constructed so as to be distorted in response to a force applied to the first principal surface; a main functional unit having piezoelectric voltage detection electrodes disposed on opposed sides of a piezoelectric film and which detect a piezoelectric voltage corresponding to a distortion amount of the piezoelectric film; and an adhesive layer which adheres the plate member and the main functional unit, the adhesive layer being divided into a plurality of areas, and at least two areas have different moduli. ## Claims ### Claim 1 A touch panel comprising: a plate member which includes a first principal surface and a second principal surface opposing each other, and is constructed so as to be distorted in response to a force applied to the first principal surface; a pressing force detecting sensor which includes: a piezoelectric film having a third principal surface and a fourth principal surface opposing each other; a first set of piezoelectric voltage detection electrodes disposed at a side of the third principal surface of the piezoelectric film; and a second set of piezoelectric voltage detection electrodes disposed at a side of the fourth principal surface of the piezoelectric film, the first set and second set of piezoelectric voltage detection electrodes detecting a piezoelectric voltage corresponding to a distortion amount of the piezoelectric film; and an adhesive layer between the second principal surface of the plate member and the third principal surface of the piezoelectric film and which adheres the plate member to the pressing force detecting sensor, and wherein the adhesive layer including a plurality of areas along a plane parallel to the third principal surface of the piezoelectric film, and at least two areas of the plurality of areas have different moduli. ### Claim 2 (depends on 1) The touch panel according to claim 1, wherein the piezoelectric film is polylactic acid. ### Claim 3 (depends on 2) The touch panel according to claim 2, wherein piezoelectric film is a uniaxial stretched piezoelectric film. ### Claim 4 (depends on 3) The touch panel according to claim 3, wherein, with respect to a line which is parallel to a stretching direction of the piezoelectric film and which divides the third principal surface of the piezoelectric film into two sections, a distribution of the different moduli is not line-symmetrical. ### Claim 5 (depends on 4) The touch panel according to claim 4, wherein a boundary between two neighboring areas of the different moduli of the adhesive layer is not linear. ### Claim 6 (depends on 5) The touch panel according to claim 5, wherein a modulus of each of the plurality of areas of the adhesive layer is one of a first modulus and a second modulus. ### Claim 7 (depends on 6) The touch panel according to claim 6, wherein a ratio of the first modulus with respect to the second modulus is twice or more. ### Claim 8 (depends on 1) The touch panel according to claim 1, wherein a boundary between two neighboring areas of the different moduli of the adhesive layer is not linear. ### Claim 9 (depends on 8) The touch panel according to claim 8, wherein a modulus of each of the plurality of areas of the adhesive layer is one of a first modulus and a second modulus. ### Claim 10 (depends on 9) The touch panel according to claim 9, wherein a ratio of the first modulus with respect to the second modulus is twice or more. ### Claim 11 (depends on 1) The touch panel according to claim 1, wherein the adhesive layer is a material having a property that a modulus thereof changes according to an amount of ultraviolet ray irradiation. ### Claim 12 (depends on 1) The touch panel according to claim 1, wherein the adhesive layer is a material having a property that a modulus thereof changes according to an amount of heat ray irradiation. ### Claim 13 (depends on 1) The touch panel according to claim 1, wherein the adhesive layer is a material having a property that a modulus thereof changes according to an amount of radiation irradiation. ### Claim 14 (depends on 1) The touch panel according to claim 1, wherein the adhesive layer is a material having a property that a modulus thereof changes according to an amount of microwave irradiation. ### Claim 15 (depends on 1) The touch panel according to claim 1, wherein the adhesive layer has a uniform thickness. ### Claim 16 (depends on 1) The touch panel according to claim 1, wherein a material of the plate member is selected from the group consisting of glass, polyethylene terephthalate, polycarbonate, and acryl. ### Claim 17 (depends on 1) The touch panel according to claim 1, wherein a material of the adhesive layer is selected from the group consisting of a rubber adhesive, an acrylic adhesive, a silicone adhesive, and a urethane adhesive.