DE102006026674A1 - Ultrasound sensor, particularly motor vehicle ultrasound sensor, has diaphragm with base movable in swinging by piezo ceramics, and piezo ceramic has metallic surface, which has element or connection - Google Patents
Ultrasound sensor, particularly motor vehicle ultrasound sensor, has diaphragm with base movable in swinging by piezo ceramics, and piezo ceramic has metallic surface, which has element or connection Download PDFInfo
- Publication number
- DE102006026674A1 DE102006026674A1 DE102006026674A DE102006026674A DE102006026674A1 DE 102006026674 A1 DE102006026674 A1 DE 102006026674A1 DE 102006026674 A DE102006026674 A DE 102006026674A DE 102006026674 A DE102006026674 A DE 102006026674A DE 102006026674 A1 DE102006026674 A1 DE 102006026674A1
- Authority
- DE
- Germany
- Prior art keywords
- piezo
- ceramic
- ultrasound sensor
- diaphragm
- membrane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 29
- 238000002604 ultrasonography Methods 0.000 title claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical group [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- 229910052709 silver Inorganic materials 0.000 claims abstract description 8
- 239000004332 silver Substances 0.000 claims abstract description 8
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 8
- 239000010937 tungsten Substances 0.000 claims abstract description 8
- 239000010970 precious metal Substances 0.000 claims abstract description 5
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000012528 membrane Substances 0.000 claims description 29
- 150000001875 compounds Chemical class 0.000 claims description 13
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 7
- 150000003658 tungsten compounds Chemical class 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 150000003377 silicon compounds Chemical class 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 6
- 239000012790 adhesive layer Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- XXEPPPIWZFICOJ-UHFFFAOYSA-N diethylpropion Chemical compound CCN(CC)C(C)C(=O)C1=CC=CC=C1 XXEPPPIWZFICOJ-UHFFFAOYSA-N 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
- H04R17/02—Microphones
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/87—Electrodes or interconnections, e.g. leads or terminals
- H10N30/877—Conductive materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/521—Constructional features
Abstract
Description
Die Erfindung hat zum Gegenstand einen Ultraschallsensor, insbesondere einen Kraftfahrzeug-Ultraschallsensor, mit einem Gehäuse, mit einer in oder an dem Gehäuse gelagerten Membran, die einen Membranboden aufweist, der über eine mit dem Membranboden verbundene Piezo-Keramik in Schwingung versetzbar ist, so dass in die Umgebung des Ultraschallsensors Ultraschallsignale abgestrahlt werden können. Von Hindernissen reflektierte Ultraschallsignale können von dem Ultraschallsensor wieder empfangen und verarbeitet werden.The The subject of the invention is an ultrasonic sensor, in particular a motor vehicle ultrasonic sensor, with a housing, with one in or on the housing mounted membrane having a membrane bottom, which has a Piezo-ceramic connected to the diaphragm bottom can be vibrated is such that in the vicinity of the ultrasonic sensor ultrasonic signals can be radiated. Ultrasound signals reflected by obstacles can be detected by the ultrasonic sensor to be received and processed again.
Im Stand der Technik wird eine solche Piezo-Keramik an die Membran mittels Kleber verbunden. Nachteilig ist jedoch, dass ein herkömmlicher Kleber eine dauerhafte und kontaktsichere Verbindung zwischen der Membran und der Piezo-Keramik beeinträchtigen kann. Die Stimulierung der Piezo-Keramik ist maßgebend für das Schwingungsverhalten der Membran. Daher besteht ein Bedürfnis die Verbindung zwischen der Piezo-Keramik und der Membran bzw. Membranboden zu verbessern.in the The state of the art is such a piezoelectric ceramic to the membrane connected by adhesive. The disadvantage, however, is that a conventional adhesive a permanent and contact-safe connection between the membrane and affect the piezo ceramic can. The stimulation of the Piezo ceramic is decisive for the vibration behavior of the Membrane. Therefore, there is a need the connection between the piezo-ceramic and the membrane or membrane bottom to improve.
Hiervon ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, einen Ultraschallsensor mit einem optimalen Schwingungsverhalten bereitzustellen.Of these, The present invention is based on the object, To provide an ultrasonic sensor with an optimal vibration behavior.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Piezo-Keramik mindestens eine metallisierte Oberfläche aufweist, die mindestes ein weiteres Element oder Verbindung mit einem Schmelzpunkt größer als 1800 Grad Celsius aufweist.These Task is inventively characterized solved, the piezo-ceramic has at least one metallised surface, the at least one other element or compound with a melting point greater than 1800 degrees Celsius.
Erfindungsgemäß bevorzugt sind solche metallisierte Oberflächen bestehend aus einem Edelmetall, insbesondere Silber.According to the invention preferred are such metallized surfaces consisting of a precious metal, in particular silver.
Im Rahmen dieser Erfindung werden unter „mindestens ein weiteres Element oder Verbindung mit einem Schmelzpunkt größer als 1800 Grad Celsius" insbesondere solche Elemente und Verbindungen verstanden, wie Wolfram, Wolframverbindungen, Siliciumverbindungen, insbesondere Siliciumcarbid, Silicumnitrid. Wolfram und Wolframverbindungen – wie Wolframtrioxid – sind besonders bevorzugt. Erfindungsgemäß besonders bevorzugt ist reines Wolfram. Solche erfindungsgemäßen Elemente und Verbindungen (auch: Dotierungsmaterialien) weisen vorteilhaft spröde und leitfähige Eigenschaften (elektrische und Wärmeleitfähigkeit) auf. Ferner verfügen solche erfindungsgemäßen Elemente und Verbindungen über eine ausreichende Härte. Insbesondere Wolfram weist zudem in den erfindungsgemäß relevanten Eigenschaften beste Werte auf und verfügt über eine hohe korrosive Beständigkeit.in the For the purposes of this invention, "at least one further element or compound having a melting point greater than 1800 degrees Celsius "especially those Elements and compounds understood, such as tungsten, tungsten compounds, silicon compounds, in particular silicon carbide, silicon nitride. Tungsten and tungsten compounds - such as tungsten trioxide - are special prefers. Particularly according to the invention preferred is pure tungsten. Such elements according to the invention and compounds (also: doping materials) have advantageous brittle and conductive Properties (electrical and thermal conductivity) on. Furthermore, such Elements of the invention and connections via a sufficient hardness. In particular, tungsten also has in the relevant according to the invention Properties best values and has a high corrosive resistance.
Zur Herstellung solcher metallisierten Oberflächen, die „mindestens ein weiteres Element oder Verbindung mit einem Schmelzpunkt größer als 1800 Grad Celsius" aufweisen, wird eine Metallpaste, -pulver, vorzugsweise ein Edelmetall, insbesondere Silber, mit mindestens einem erfindungsgemäß geeigneten Element oder Verbindung (Dotierungsmaterial) versetzt und über eine Glasfritte gezogen. Dies führt zu einer vorteilhaften Dotierung auf einer Oberfläche der Piezo-Keramik, sobald der Metallisierungseinbrand der Piezo-Keramik nach Bedrucken erfolgt ist. Üblicher Weise erfolgt der Metallisierungseinbrand bei 700 Grad Celsius. Erfindungsgemäß bevorzugt ist eine Wolframdotierung auf einer Silberoberfläche der Piezo-Keramik. In einer bevorzugten Ausführungsform wird eine Silberpaste 10 : 1 (w/w) mit Wolframpulver gemischt. Eine solche Pulveremulsion weist einen vorteilhaften Rakeldruck an der Glasfritte auf. Ferner ist bevorzugt, dass die Partikelgröße des Dotierungsmaterials ca. 0,01 mm bis 0,05 mm, insbesondere 0,025 mm beträgt.to Preparation of such metallized surfaces, the "at least one other element or compound having a melting point greater than 1800 degrees Celsius a metal paste, powder, preferably a precious metal, in particular Silver, with at least one element or compound suitable according to the invention (Dopant) and pulled over a glass frit. this leads to an advantageous doping on a surface of the piezoelectric ceramic, as soon as the Metallization penetration of the piezo-ceramic is done after printing is. usual The metallization firing takes place at 700 degrees Celsius. According to the invention is preferred a tungsten doping on a silver surface of the piezo ceramic. In a preferred embodiment a silver paste 10: 1 (w / w) is mixed with tungsten powder. A Such powder emulsion has an advantageous squeegee pressure on the Glass frit on. It is further preferred that the particle size of the doping material about 0.01 mm to 0.05 mm, in particular 0.025 mm.
Diese Dotierung der metallisierten Oberfläche führt zu vorteilhaften Oberflächendeformationen, die eine erfindungsgemäße Verbindung der Piezo-Keramik mit der Membran unterstützen. Die erfindungsgemäßen Partikel bilden so genannte „Spikes" auf der metallisierten Oberfläche. Ferner erhöht die Dotierung besonders vorteilhaft die Leitfähigkeit an der Grenzfläche Membranboden/Piezo-Keramik. Insbesondere erfolgt mittels der erfindungsgemäßen Dotierung neben einer Erhöhung der leitfähigen Anteile eine Oberflächenvergrößerung der Piezo-Keramik.These Doping the metallized surface leads to favorable surface deformations that a compound of the invention support the piezo ceramic with the membrane. The particles according to the invention form so-called "spikes" on the metallized Surface. Further increased the doping particularly advantageous the conductivity at the interface membrane bottom / piezo ceramic. In particular, by means of the doping according to the invention in addition to an increase in the conductive Shares a surface enlargement of the Piezo ceramics.
Besonders vorteilhaft kann nunmehr der Einsatz eines Klebers erfolgen, da bereits eine dünne homogene Schicht eines Klebers bereits eine hinreichende Kopplungsstärke erzielt. Ferner führt eine solche dünne, homogene Klebeschicht zu einer vorteilhaften schnellen Aushärtung. Insbesondere ein Pressen zwischen der Membranbodenfläche und der Piezo-Keramik erlaubt ein Eindringen der Dotierungsmaterialien in die Membran und deren vorteilhaften Verankerung unter Ausbildung einer Verbindung zwischen der Membranbodenfläche und der Piezo-Keramik. In einer bevorzugten Ausführungsform besteht daher die Membran aus einem weichen Metall, wie Aluminium oder passiviertes Aluminium.Especially Advantageously, the use of an adhesive can now take place since already a thin homogeneous Layer of adhesive already achieved a sufficient coupling strength. Further leads such a thin, homogeneous adhesive layer for an advantageous rapid curing. Especially a pressing between the diaphragm bottom surface and the piezo ceramic allowed penetration of the doping materials into the membrane and their advantageous anchoring to form a connection between the membrane bottom surface and the piezo ceramics. In a preferred embodiment therefore, the membrane of a soft metal, such as aluminum or passivated Aluminum.
Zudem wird durch das erfindungsgemäße Dotierungsmaterial das anaerobe Aushärten eines Klebers begünstigt.moreover is due to the doping material according to the invention the anaerobic curing of an adhesive favors.
Daher betrifft die Erfindung eine solche weitere Ausführungsform, wobei der Membranboden und die Piezo-Keramik zusätzlich mit einem Kleber verbunden sind.Therefore the invention relates to such a further embodiment, wherein the membrane bottom and the piezo ceramic in addition are connected with an adhesive.
Die ausgehend zu verwendende Piezo-Keramik ist handelsüblich zu erhalten.The starting to use Piezo Kera mik is commercially available.
Die Erfindung betrifft ebenfalls ein Piezo-Element umfassend eine Piezo-Keramik enthaltend mindestens eine metallisierte Oberfläche, vorzugsweise bestehend aus Silber, und mindestens ein weiteres Element oder Verbindung mit einem Schmelzpunkt größer als 1800 Grad Celsius, wie oben ausgeführt, ebenfalls in den bevorzugten Ausführungsformen.The The invention also relates to a piezoelectric element comprising a piezoelectric ceramic containing at least one metallized surface, preferably consisting of silver, and at least one other element or compound with a melting point greater than 1800 degrees Celsius, as stated above, also in the preferred Embodiments.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein besonders bevorzugtes Ausführungsbeispiel im Einzelnen beschrieben ist. Dabei können die in der Zeichnung gezeigten sowie in den Ansprüchen sowie in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein.Further Advantages, features and details of the invention will become apparent the following description, with reference to the drawing a particularly preferred embodiment is described in detail. It can be shown in the drawing as well as in the claims as well as mentioned in the description Features individually for each itself or in any combination essential to the invention.
In der Zeichnung zeigen:In show the drawing:
In
An
der dem Gehäuse
Der
durch die im Wesentlichen zylindrische Gestalt der Membran
Die
Piezo-Keramik
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006026674A DE102006026674A1 (en) | 2006-06-02 | 2006-06-02 | Ultrasound sensor, particularly motor vehicle ultrasound sensor, has diaphragm with base movable in swinging by piezo ceramics, and piezo ceramic has metallic surface, which has element or connection |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102006026674A DE102006026674A1 (en) | 2006-06-02 | 2006-06-02 | Ultrasound sensor, particularly motor vehicle ultrasound sensor, has diaphragm with base movable in swinging by piezo ceramics, and piezo ceramic has metallic surface, which has element or connection |
Publications (1)
Publication Number | Publication Date |
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DE102006026674A1 true DE102006026674A1 (en) | 2007-12-06 |
Family
ID=38650600
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DE102006026674A Withdrawn DE102006026674A1 (en) | 2006-06-02 | 2006-06-02 | Ultrasound sensor, particularly motor vehicle ultrasound sensor, has diaphragm with base movable in swinging by piezo ceramics, and piezo ceramic has metallic surface, which has element or connection |
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DE (1) | DE102006026674A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009040374A1 (en) * | 2009-09-07 | 2011-03-17 | Valeo Schalter Und Sensoren Gmbh | Ultrasonic transducer for vehicle body, is provided with decoupling ring for damping vibrations between shielded conductive housing and vibration-generating membrane |
WO2012175492A2 (en) | 2011-06-24 | 2012-12-27 | Avl List Gmbh | Capacitive ultrasonic transducer |
DE102011120391A1 (en) * | 2011-12-06 | 2013-06-06 | Valeo Schalter Und Sensoren Gmbh | Ultrasonic sensor for a motor vehicle, motor vehicle and method for producing an ultrasonic sensor |
DE102012208059A1 (en) * | 2012-05-14 | 2013-11-14 | Robert Bosch Gmbh | Sensor assembly for measuring distance in vehicle, has membrane, which is positively integrated as separate component or in form of fiber mat in support element, and damping material is applied on vibratable portion of membrane |
DE102012104227A1 (en) * | 2012-05-15 | 2013-11-21 | Endress + Hauser Gmbh + Co. Kg | Ultrasonic transducer has attenuation capping portion that is interlaced with metal or metal oxide particles at room temperature, such that cross-linking encapsulation is conditioned with micro hollow spheres |
EP2937857A2 (en) | 2014-04-24 | 2015-10-28 | Robert Bosch Gmbh | Membrane for an ultrasonic transducer and ultrasonic transducer |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3731080A1 (en) * | 1987-09-16 | 1989-03-30 | Claas Ohg | LOSS GRAIN SENSOR FOR HARVESTING MACHINES |
EP0498015A1 (en) * | 1991-02-07 | 1992-08-12 | Siemens Aktiengesellschaft | Process for manufacturing ultrasonic transducers |
WO1999057939A1 (en) * | 1998-05-01 | 1999-11-11 | Boston Scientific Limited | Transducer backing material and method of application |
WO2001017037A1 (en) * | 1999-08-27 | 2001-03-08 | Product Systems Incorporated | Chemically inert megasonic transducer system |
-
2006
- 2006-06-02 DE DE102006026674A patent/DE102006026674A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3731080A1 (en) * | 1987-09-16 | 1989-03-30 | Claas Ohg | LOSS GRAIN SENSOR FOR HARVESTING MACHINES |
EP0498015A1 (en) * | 1991-02-07 | 1992-08-12 | Siemens Aktiengesellschaft | Process for manufacturing ultrasonic transducers |
WO1999057939A1 (en) * | 1998-05-01 | 1999-11-11 | Boston Scientific Limited | Transducer backing material and method of application |
WO2001017037A1 (en) * | 1999-08-27 | 2001-03-08 | Product Systems Incorporated | Chemically inert megasonic transducer system |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009040374A1 (en) * | 2009-09-07 | 2011-03-17 | Valeo Schalter Und Sensoren Gmbh | Ultrasonic transducer for vehicle body, is provided with decoupling ring for damping vibrations between shielded conductive housing and vibration-generating membrane |
WO2012175492A2 (en) | 2011-06-24 | 2012-12-27 | Avl List Gmbh | Capacitive ultrasonic transducer |
DE102011120391A1 (en) * | 2011-12-06 | 2013-06-06 | Valeo Schalter Und Sensoren Gmbh | Ultrasonic sensor for a motor vehicle, motor vehicle and method for producing an ultrasonic sensor |
DE102012208059A1 (en) * | 2012-05-14 | 2013-11-14 | Robert Bosch Gmbh | Sensor assembly for measuring distance in vehicle, has membrane, which is positively integrated as separate component or in form of fiber mat in support element, and damping material is applied on vibratable portion of membrane |
DE102012208059B4 (en) | 2012-05-14 | 2022-05-12 | Robert Bosch Gmbh | Carrier element with integrated sensor unit |
DE102012104227A1 (en) * | 2012-05-15 | 2013-11-21 | Endress + Hauser Gmbh + Co. Kg | Ultrasonic transducer has attenuation capping portion that is interlaced with metal or metal oxide particles at room temperature, such that cross-linking encapsulation is conditioned with micro hollow spheres |
EP2937857A2 (en) | 2014-04-24 | 2015-10-28 | Robert Bosch Gmbh | Membrane for an ultrasonic transducer and ultrasonic transducer |
DE102014207681A1 (en) | 2014-04-24 | 2015-10-29 | Robert Bosch Gmbh | Membrane for an ultrasonic transducer and ultrasonic transducer |
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