# US 2014/0233769 A1 · Diaphragm arrangement for generating sound > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0233769 A1 - Document ID: US20140233769A1 - Status: Published application - Kind: A1 - Application number: 14/348,012 - Filed: 2012-09-14 - Published: 2014-08-21 - Earliest claimed: 2011-09-28 - Assignees: EADS Deutschland GmbH - Applicants: Eads Deutschland GmbH - Inventors: Stefan Storm - Web page: https://patentgrep.com/patent/US20140233769A1 ## CPC - H04R 7/10: comprising superposed layers in contact - F02C 7/045: having provisions for noise suppression - H04R 7/04: Plane diaphragms - F05B 2260/962: by means creating "anti-noise" - H04R 1/06: Arranging circuit leads; Relieving strain on circuit leads - H04R 17/00: Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) - H04R 2201/02: Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups - H04R 2307/027: Diaphragms comprising metallic materials - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G ## Abstract The invention relates to a diaphragm arrangement which is intended to be fitted to a structural component or fixing ring for the purpose of generating sound, having two piezo crystals which are fitted opposite one another on either side of an electrically conductive diaphragm which can oscillate, wherein the piezo crystals are each fastened to the diaphragm, which has a connection contact, in an electrically conductive and force-transmitting manner, and the piezo crystals are each electrically conductively connected to a contact plate on their opposite side. In this case, each contact plate has at least one contact strip which extends in the direction of the structural component and of which the end in each case has an electrical connection contact. The diaphragm arrangement can be excited by electrical voltages which can be applied to the three connection contacts. This produces a secure contact-connection during operation and the contact plates act as heat-conducting plates for dissipating heat from the piezo crystals. ## Claims ### Claim 1 Diaphragm arrangement which is intended to be fitted to a structural component for the purpose of generating sound, having two piezo crystals which are fitted opposite one another on either side of an electrically conductive diaphragm which can oscillate, wherein the piezo crystals are each fastened to the diaphragm, which has a connection contact, in an electrically conductive and force-transmitting manner, and the piezo crystals are each electrically conductively connected to a contact plate on their opposite side, wherein each contact plate has at least one contact strip which extends substantially in the direction of the structural component and of which the free end has an electrical connection contact, wherein the diaphragm arrangement can be excited by electrical voltages which can be applied to the three connection contacts. ### Claim 2 (depends on 1) Diaphragm arrangement according to claim 1, wherein said diaphragm arrangement is round or oval. ### Claim 3 (depends on 1) Diaphragm arrangement according to claim 1, wherein a fixing ring, which can be fitted to the structural component, is provided, the diaphragm arrangement being fastened to said fixing ring. ### Claim 4 (depends on 3) Diaphragm arrangement according to claim 3, wherein the contact strips are fitted to the fixing ring, and the connection contacts are connected to outer connections, which are situated next to one another on the fixing ring, in an electrically conductive manner. ### Claim 5 (depends on 1) Diaphragm arrangement according to claim 1, wherein an electrically conductive filling material for the purpose of electrical connection is in each case arranged between the two piezo crystals and the diaphragm or the contact plates, adhesive passing through said filling material in order to fix the piezo crystals to said diaphragm in an electrically conductive manner. ### Claim 6 (depends on 5) Diaphragm arrangement according to claim 5, wherein the filling material is a metal wire mesh, which is preferably composed of a copper alloy. ### Claim 7 (depends on 1) Diaphragm arrangement according to claim 1, wherein the piezo crystals are fastened to the diaphragm in a mechanically prestressed manner in such a way that no tensile stresses occur in said diaphragm during operation. ### Claim 8 (depends on 1) Diaphragm arrangement according to claim 1, wherein each of the contact strips extends, starting from the respective contact plate, initially in the direction of the contact connection and then further extends at a short distance from the diaphragm plane. ### Claim 9 (depends on 1) Diaphragm arrangement according to claim 1, wherein the contact plates project radially beyond the edge of the piezo crystals. ### Claim 10 (depends on 9) Diaphragm arrangement according to claim 9, wherein sealing rings are in each case arranged beneath the contact plates outside the narrow sides of the piezo crystals. ### Claim 11 (depends on 1) Diaphragm arrangement according to claim 1, wherein said diaphragm arrangement is enclosed by a non-conductive fiber-reinforced composite. ### Claim 12 (depends on 11) Diaphragm arrangement according to claim 11, wherein the fiber-reinforced composite extends beyond the diaphragm in the plane of said diaphragm and can be fixed to the outside of the fixing ring, wherein at least one contact strip, which extends in the direction of the fixing ring, is provided on the diaphragm, the end of said contact strip having a connection contact. ### Claim 13 (depends on 12) Diaphragm arrangement according to claim 12, wherein the diaphragm has two radially opposite contact strips. ### Claim 14 (depends on 1) Gas turbine engine having a number of stator blades, wherein a diaphragm arrangement according to claim 1 is fitted at least to some of the stator blades in a bypass channel or a compressor. ### Claim 15 (depends on 1) Wing having a slot actuator system for influencing the boundary layer, wherein said wing has a diaphragm arrangement according to claim 1.