# US 2014/0191620 A1 · Piezoelectric component and method for producing a piezoelectric component > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0191620 A1 - Document ID: US20140191620A1 - Status: Published application - Kind: A1 - Application number: 14/151,961 - Filed: 2014-01-10 - Published: 2014-07-10 - Earliest claimed: 2013-01-10 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Reinhold Melcher; Michael Guenther - Web page: https://patentgrep.com/patent/US20140191620A1 ## CPC - H10N 30/877: {Conductive materials} - H10N 30/063: Forming interconnections, e.g. connection electrodes of multilayered piezoelectric or electrostrictive parts - H10N 30/073: by fusion of metals or by adhesives - H10N 30/302: {Sensors} - H10N 30/872: {Interconnections, e.g. connection electrodes of multilayer piezoelectric or electrostrictive devices} - H10N 30/875: {Further connection or lead arrangements, e.g. flexible wiring boards, terminal pins} - Y10T 29/42: Piezoelectric device making - H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An electrically conductive contact layer (4) is provided with a joining material (9) during a method for producing a piezoelectric component (1), in particular a piezoelectric sensor (1). To this end, the electrically conductive contact layer (4) can be dipped into a paste that serves to form the joining material (9). The contact layer (4) provided with the joining material (9) is subsequently disposed between a first piezoceramic layer (2) and a second piezoceramic layer (3). The contact layer (4) is then inserted via the joining material (9) between the first piezoceramic layer (2) and the second piezoceramic layer (3), wherein a pressure is applied to the first piezocermaic layer (2) against the second piezoceramic layer (3). ## Claims ### Claim 1 A piezoelectric component (1) having a first piezoceramic layer (2), at least one second piezoceramic layer (3) and at least one electrically conductive contact layer (4) which is disposed at least partially between the first piezoceramic layer (2) and the second piezoceramic layer (3), wherein the contact layer (4) is inserted via a joining material (9) between the first piezoceramic layer (2) and the second piezoceramic layer (3). ### Claim 2 (depends on 1) The piezoelectric component according to claim 1, characterized in that the contact layer (4) is inserted by way of the joining material (9) between the first piezoceramic layer (2) and the second piezoceramic layer (3) by applying pressure to the first piezoceramic layer (2) against the second piezoceramic layer (3). ### Claim 3 (depends on 1) The piezoelectric component according to claim 1, characterized in that the joining material (9) is based on silver or a silver compound. ### Claim 4 (depends on 1) The piezoelectric component according to claim 1, characterized in that the joining material (9) is connected to the contact layer (4) by means of sintering. ### Claim 5 (depends on 1) The piezoelectric component according to claim 1, characterized in that the contact layer (4) protrudes out of the composite comprising the first piezoceramic layer (2) and the second piezoceramic layer (3). ### Claim 6 (depends on 1) The piezoelectric component according to claim 1, characterized in that the electrically conductive contact layer (4) is formed by a metallic insert (4). ### Claim 7 (depends on 1) The piezoelectric component according to claim 1, characterized in that the first piezoceramic layer (2) and the second piezoceramic layer (3) are connected via the joining material to the contact layer (4) inserted between the same such that said first piezoceramic layer and said second piezoceramic layer have at least approximately congruent connection cross-sectional surfaces. ### Claim 8 A method for producing a piezoelectric component (1), comprising providing an electrically conductive contact layer (4) at least partially with a joining material (9), disposing the contact layer (4) provided with the joining material (9) at least partially between a first piezoceramic layer and a second piezoceramic layer (3), and inserting the contact layer (4) via the joining material (9) between the first piezoceramic layer (2) and the second piezoceramic layer (3). ### Claim 9 (depends on 8) The method according to claim 8, characterized in that when inserting the contact layer (4) via the joining material (9) between the first piezoceramic layer (2) and the second piezoceramic layer (3), a pressure is applied to the first piezoceramic layer (2) against the second piezoceramic layer (3). ### Claim 10 (depends on 8) The method according to claim 8, characterized in that the electrically conductive contact layer (4) is dipped at least partially into a paste that serves to form the joining material (9) in order to provide the electrically conductive contact layer (4) with the joining material (9). ### Claim 11 (depends on 1) The piezoelectric component according to claim 1, characterized in that the joining material (9) is based on at least one of silver, a silver compound and a silver alloy, wherein the silver or, respectively, the silver compound and/or the silver alloy is filled with a further material. ### Claim 12 (depends on 1) The piezoelectric component according to claim 1, characterized in that that the joining material (9) is connected to the first piezoceramic layer (2) and the second piezoceramic layer (3) by means of sintering. ### Claim 13 (depends on 12) The piezoelectric component according to claim 12, characterized in that the joining material (9) is connected to the contact layer (4) by means of sintering. ### Claim 14 (depends on 8) The method according to claim 8, characterized in that the joining material (9) is based on silver or a silver compound. ### Claim 15 (depends on 8) The method according to claim 8, characterized in that the joining material (9) is connected to the contact layer (4) by means of sintering. ### Claim 17 (depends on 8) The method according to claim 8, characterized in that the contact layer (4) protrudes out of the composite comprising the first piezoceramic layer (2) and the second piezoceramic layer (3). ### Claim 17 (depends on 8) The method according to claim 8, characterized in that the electrically conductive contact layer (4) is formed by a metallic insert (4). ### Claim 18 (depends on 8) The method according to claim 8, characterized in that the first piezoceramic layer (2) and the second piezoceramic layer (3) are connected via the joining material to the contact layer (4) inserted between the same such that said first piezoceramic layer and said second piezoceramic layer have at least approximately congruent connection cross-sectional surfaces.