# US 2014/0191621 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 2014/0191621 A1 - Document ID: US20140191621A1 - Status: Published application - Kind: A1 - Application number: 14/152,044 - Filed: 2014-01-10 - Published: 2014-07-10 - Earliest claimed: 2013-01-10 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Reinhold Melcher; Jan Benes - Web page: https://patentgrep.com/patent/US20140191621A1 ## CPC - F02M 65/003: {Measuring variation of fuel pressure in high pressure line} - H10N 30/053: by integrally sintering piezoelectric or electrostrictive bodies and electrodes - H10N 30/06: Forming electrodes or interconnections, e.g. leads or terminals - H10N 30/063: Forming interconnections, e.g. connection electrodes of multilayered piezoelectric or electrostrictive parts - H10N 30/086: by polishing or grinding - H10N 30/088: by cutting or dicing - H10N 30/501: {having a non-rectangular cross-section in a plane parallel to the stacking direction, e.g. polygonal or trapezoidal in side view} - H10N 30/503: {having a non-rectangular cross-section in a plane orthogonal to the stacking direction, e.g. polygonal or circular in top view} - H10N 30/872: {Interconnections, e.g. connection electrodes of multilayer piezoelectric or electrostrictive devices} - H10N 30/206: {using only longitudinal or thickness displacement, e.g. d33 or d31 type devices} - H10N 30/302: {Sensors} - Y10T 29/42: Piezoelectric device making - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A piezoelectric component (1), which serves in particular as a piezoelectric sensor or a piezoelectric actuator, comprises a main body (2). The main body (2) has a first ceramic layer (15), a second ceramic layer (16) and an inner electrode layer (17). An outer metallization (5) is provided here, applied to an outer side (3) of the main body (2) and contacting the inner electrode layer (17). The main body (2) has a removal of material (4), the removal of material (4) separating the outer metallization (5) from an end-face outer electrode (7), which is formed by a metallization (7) of an end face (6) of the main body (2). A method for producing a piezoelectric component (1) is also provided. ## Claims ### Claim 1 A piezoelectric component (1) with a main body (2), which has a first ceramic layer (15), a second ceramic layer (16) and an inner electrode layer (17), an outer metallization (5) being provided, applied to an outer side (3) of the main body (2) and contacting the inner electrode layer (17), the main body (2) having a removal of material (4) and the removal of material (4) separating the outer metallization (5) from an end-face outer electrode (7), which is formed by a metallization (7) of an end face (6) of the main body (2). ### Claim 2 (depends on 1) The piezoelectric component according to claim 1, characterized in that on a further end face (8) of the main body (2) that is remote from the end face (6) there is applied a metallization (9), which forms a further end-face outer electrode (9), and in that the main body (2) has a further removal of material (10), which separates the outer metallization (5) from the further end-face outer electrode (9). ### Claim 3 (depends on 2) The piezoelectric component according to claim 2, characterized in that the removal of material (4) is configured as a bevel that is provided on the end face (6) of the main body (2). ### Claim 4 (depends on 3) The piezoelectric component according to claim 3, characterized in that the main body (2) is based on a cylindrical configuration, in that the outer metallization (5) is applied as one to an outer side (3) of the main body (2) in the form of a cylindrical shell and in that the bevel (4) that is provided on the end face (6) of the main body (2) encloses the end face (6) of the main body (2) in an annular manner. ### Claim 5 (depends on 3) The piezoelectric component according to claim 3, characterized in that the main body (2) is based on a cylindrical configuration with at least one lateral flattening (18, 19) on the outer side (3), in that the outer metallization (5, 20) is applied on the lateral flattening (18, 19) of the main body (2) and in that the bevel (4, 21) that is provided on the end face (6) of the main body (2) runs on the end face (6) in a straight line along the lateral flattening (18, 19) of the main body (2). ### Claim 6 A method for producing a piezoelectric component (1), comprising applying an outer metallization (5) to an outer side (3) of a block (30) in rod form, which has a multiplicity of ceramic layers (15, 16, 32-36) and a multiplicity of electrode layers (17, 37-41) arranged between the ceramic layers (15, 16, 32-36), cutting off a main body (2) from the block (30) in rod form, removing a removal of material (4) from the main body (2), forming a metallization (7), which forms an end-face outer electrode (7), on an end face (6) of the main body (2), and configuring the removal of material (4) such that the outer metallization (5) is separated from the end-face outer electrode (7) by the removal of material (4). ### Claim 7 (depends on 6) The method according to claim 6, characterized in that the outer metallization (5) is applied as one to the entire outer side (3) of the block (30) in rod form. ### Claim 8 (depends on 7) The method according to claim 7, characterized in that the block (30) in rod form is formed with an outer side (3) in the form of a cylindrical shell, in that the removal of material (4) is configured in the form of a bevel (4), which encloses the end face (6) of the main body (2) in an annular form, on the end face (6) of the main body (2) and in that the end face (6) of the main body (2) remaining within the bevel (4) is coated with the metallization (7) for the end-face outer electrode (7). ### Claim 9 (depends on 6) The method according to claim 6, characterized in that a lateral flattening (18, 19) that extends along a longitudinal axis (31) of the block (30) in rod form is configured on the block (30) in rod form and in that the outer metallization (5, 20) is applied to the lateral flattening (18, 19) of the block (30) in rod form. ### Claim 10 (depends on 9) The method according to claim 9, characterized in that the removal of material (4, 21) is configured in the form of a bevel (4, 21), which runs in a straight line along the lateral flattening (18, 19) of the main body (2) that is obtained from the lateral flattening (18, 19) of the block (30) in rod form, on the end face (6) of the main body (2), and in that the end face (6) of the main body (2) remaining alongside the bevel (4, 11) is coated with the metallization (7) for the end-face outer electrode (7). ### Claim 11 (depends on 2) The piezoelectric component according to claim 2, characterized in that the further removal of material (10) is configured as a bevel (10) that is provided on the further end face (8) of the main body (2). ### Claim 12 (depends on 11) The piezoelectric component according to claim 11, characterized in that the main body (2) is based on a cylindrical configuration, in that the outer metallization (5) is applied as one to an outer side (3) of the main body (2) in the form of a cylindrical shell and in that the bevel (10) that is provided on the further end face (8) of the main body (2) encloses the further end face (8) of the main body (2) in an annular manner. ### Claim 13 (depends on 11) The piezoelectric component according to claim 11, characterized in that the main body (2) is based on a cylindrical configuration with at least one lateral flattening (18, 19) on the outer side (3), in that the outer metallization (5, 20) is applied on the lateral flattening (18, 19) of the main body (2) and in that the bevel (10, 22) that is provided on the further end face (8) of the main body (2) runs on the further end face (8) in a straight line along the lateral flattening (18, 19) of the main body (2).