EP1997100B1 - Ultrasonic sensor - Google Patents

Ultrasonic sensor Download PDF

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Publication number
EP1997100B1
EP1997100B1 EP07712104A EP07712104A EP1997100B1 EP 1997100 B1 EP1997100 B1 EP 1997100B1 EP 07712104 A EP07712104 A EP 07712104A EP 07712104 A EP07712104 A EP 07712104A EP 1997100 B1 EP1997100 B1 EP 1997100B1
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EP
European Patent Office
Prior art keywords
housing
cover
ultrasound sensor
damping element
lid
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.)
Not-in-force
Application number
EP07712104A
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German (de)
French (fr)
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EP1997100A1 (en
Inventor
Martin Reiche
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1997100A1 publication Critical patent/EP1997100A1/en
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    • 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
    • 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
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49007—Indicating transducer

Definitions

  • the present invention relates to an ultrasonic sensor for a vehicle and a corresponding method for producing the same.
  • Ultrasonic sensors are used in motor vehicles, for example, as a parking aid, for which purpose in particular a so-called Nahmessele in a Entfemungs Society of less than 30 cm is a crucial functional requirement. They consist generally of a housing and a transducer element arranged therein (sieche zb JP 10 206 528 A ).
  • the housing is usually formed or milled from a metallic material, such as aluminum. It is coated for corrosion protection and Lackierfugn with a primer.
  • An electromechanical transducer element eg, a piezoelectric element
  • the housing is filled with a damping material.
  • a damping material is an injected silicone foam.
  • a contacting of the transducer elements consists for example in that a connecting line is attached to the metallized transducer element top of the piezoelectric element, wherein the underside of the transducer element is fixed with an adhesive on the bottom of the housing.
  • the metallic housing or the metallic membrane forms the second terminal or the second electrode (cathode).
  • the second connecting line is then soldered to the conductive housing (made of aluminum, for example), suitably connected by drilling the housing wall thereto or fastened to a housing journal, which is considered to be disadvantageous in terms of the number of components and the production outlay.
  • the contacting of the transducer element underside is carried out by a so-called Umking mich.
  • the piezoceramic disc is completely coated with silver and at the top a D-shaped separating cut (see Fig. 2 ) of the silver coating. This creates on the top two contactable by strand, bonds or other conductors surfaces.
  • the disadvantage here is the non-homogeneous field / force distribution in the piezoceramic, since the upper surface is only partially covered by the D-section through the one (anode) contact (inhomogeneous plate capacitor).
  • a further disadvantage is that, in the case of an incorrect bonding (depending on the thickness of the bonding and roughness of the bottom) of the underside of the transducer element to the bottom of the housing, the housing is not contacted by the Umutton michitzer to ground (GND or ground) and the sensor undesirable to work as a capacitive sensor, where he is sensitive to electrical interference.
  • UTD Umbit or ground
  • thermocompression welding with low mass contribution is functionally advantageous in the series.
  • the JP 2002238095 A describes an ultrasonic sensor with a lid, wherein the housing is formed on the one hand smooth-walled and on the other hand with gradations that require increased manufacturing costs.
  • the cover may be staggered in the housing to dampen certain vibration modes, the adjustment of this position means increased expense.
  • the lid has a smooth surface, whereby it is made thicker than the pot membrane, but otherwise not specified. Has cut-outs or bulges.
  • the concept is to store the unilaterally free oscillator "pot wall" at the top hard and thus produce a bilaterally suspended bending shaft (Drawing 6 and 7).
  • the lid is glued.
  • the terminals are attached to the transducer element and to the housing in unspecified manner.
  • the DE 296 14 691 U 1 describes an ultrasonic sensor in which a felt insert is held by a cover disk above a transducer element. The contacting of the transducer element takes place via a direct connection and via a contact pin inserted in a weighting ring.
  • the structure is complex and includes the construction of a prestressed Teflon film.
  • the DE 101 25 272 A1 describes an ultrasonic sensor and its manufacturing method. Its transducer element is covered by three different layers, wherein a cover covers three housing parts. A conductive housing part, which forms the membrane, is provided with a caulked connection. This writing refers only to the Generation of decoupling ring between oscillating membrane and housing by encapsulation with silicone.
  • An ultrasonic transducer used in the DE 197 44 229 A1 has a housing with a bead and a housing closing decoupling ring on.
  • the decoupling ring forms in one embodiment simultaneously use as a damping material within the housing. In another embodiment, it has a cylindrical passage opening which is filled with a damping material. A closer specification of the passage opening in terms of their geometry and function is not given.
  • the decoupling ring also serves as a holder for the terminals of the transducer element, wherein connection of the housing is present.
  • the DE 44 34 692 A1 is an example illustrating the attachment of a piezoceramic with conductive adhesive on a metal plate of an ultrasonic sensor.
  • the ultrasonic sensor according to the invention has the advantage that it meets the requirements of the decisive Nahmess sparkle with a small number of components. Another advantage is that the components are designed so that a production of the ultrasonic sensor has no difficult-to-control processes and manual production is made possible in a simple manner.
  • the ultrasonic sensor has a housing which is closed by a lid, which at the same time includes a damping element, allows the implementation of the connecting line and the contacting of the housing in a simple manner. During manufacture, another damping element is inserted into the housing.
  • the cover has a geometry shape which is designed in such a way that disturbing wall waves are introduced, if possible, without reflection into the plastic damping element introduced into it.
  • the housing is closed with a lid whose contour is adapted to the course of the housing inner wall in order to achieve a smooth transition of the wall vibration in the lid.
  • the lid is connected to the housing by means of an adhesive.
  • an adhesive for ease of manufacture, it is advantageously provided that the connection of the cover to the housing by means of a protruding from the edge of the mold section connecting element in cooperation with a corresponding receptacle in the housing is formed non-positively. This can be, for example, a so-called clip connection. Between the lid and the pot wall, a circumferential traction is provided.
  • the housing oscillations are not prevented by a hard suspension at the top of the housing wall, but as possible adapted to the mechanical impedance converted into thermal energy in the second damping element.
  • the lid is provided with a through opening in which the damping element is arranged, wherein the opening has a continuous edge profile of its inner wall.
  • the continuous edge course ensures that the wall vibrations transmitted into the cover are adapted to migrate into this damping element where they are converted into thermal energy, whereby they swing out in a damped way.
  • the cover is provided with feedthroughs for connection lines of the transducer element.
  • the lid has at least one contacting device for a electrically conductive connection between a connection element and the housing. This advantageously achieves that on the one hand a transducer element can be used, which is only metallized on one side, wherein the lower electrode is formed by the conductive housing. On the other hand, there is the advantage that when applying the lid to the housing at the same time a contacting of the housing takes place, thereby eliminating additional processing of the housing and the production is simplified.
  • the contacting device is designed as an insulation displacement construction or as a spring contact.
  • the insulation displacement structure is integrated in the lid.
  • the contacting can be a conductive adhesive, with the advantage that the conductive adhesive simultaneously forms the non-positive connection of the lid with the housing.
  • a further embodiment provides that the outer diameter of the cover for holding a decoupling ring is slightly larger than the outer diameter of the housing. This increases the possibility of using the sensor for other applications. The need for a retaining bead or groove on the metallic housing wall is thus eliminated. There is another advantage in that the mechanical impedance of the wall is not changed.
  • the housing advantageously has no bead or groove. As a result, a change in the mechanical impedance of the housing wall and thus a reflection point for vibrations in the housing wall are avoided.
  • the first damping element is designed as an insertable into the housing open-pore foam insert component. This can be done manually in a simple manner before closing the housing.
  • connection cables are soldered to the corresponding connection points and then the first damping element is inserted into the housing.
  • the ultrasonic sensor remains at its operating frequency 48 kHz low impedance and thus efficient. This is done by selective attenuation of the membrane with the insert 1. It can be controlled with smaller transmission voltages and has higher generator voltages in the microphone range.
  • the former is synonymous with a reduced risk of depolarization of the piezoceramic, less overdriving a transformer in the non-linearity or the possibility of a smaller transformer gear ratio and thereby the use of a smaller sized driver stage.
  • the lid itself can be preproduced as a precursor with its introduced damping material regardless of cycle times of the sensor manufacturing, buffering a single-stranded production line can be avoided.
  • This damping material can be designed specifically for the wall vibrations.
  • the waiver of the bead in the case means advantages in the rough production of the housing by extrusion.
  • the senor Due to the high transmission efficiency and improved noise / noise margins when receiving, the sensor is well suited for realizing larger ranges for advanced functions such as parking space measurement, blind spot monitoring, LSF, etc.
  • the Nahmes emphasis the sensor of the invention improves by the lid insert in a non-foamed housing of about 28 ... 30 cm to about 22 ... 23 cm on the plausibilized binary signal.
  • FIG. 1 an inventive sensor 1 is shown in a sectional view as an embodiment.
  • a housing 2 has a bottom 5 as a membrane. Furthermore, the housing 2 has on its upper side an edge 4 with an opening with a contour 6 (see Fig. 2 ), in which a lid 17 is inserted.
  • the housing 2 is preferably a die-pressed aluminum part.
  • transducer element 8 is fastened by means of a connecting element 7, here an adhesive, on the bottom of the housing 2.
  • the transducer element 8 has only a one-sided first coating 9 made of a suitable metal, for example silver.
  • the coating 9 is connected via a soldering in a first connection point 12 to a first supply line 14.
  • transducer elements 8, in which a second coating 10 is present on its underside, can be used, wherein the connecting element 7 is then formed as a conductive adhesive.
  • a first damping element 16 is inserted for damping the vibration of the membrane.
  • the first lead 14 is laid either around the first damping element 16 around or in a bulge or an incision of the damping element 16.
  • the contacting of the housing 2 for connection of the underside of the transducer element 8 is formed by a contacting device 30, which is located on the underside of the lid 17 on a mold section 23.
  • This contacting device 30 can be embodied, for example, as an insulation displacement construction, spring construction, or simply a conductive adhesive.
  • the conductive adhesive can also form a frictional connection of the lid 17 with the housing 2 at the same time.
  • the contacting device 30 is connected within the lid 17 with a connection element 29, which in this example protrudes beyond the lid 17, to which a second supply line can be connected, for example by soldering.
  • the cover 17 closes the housing 2 by its form portion 23 is positively inserted into the contour 6 of the housing opening.
  • a frictional connection can be made by means of an adhesive and / or a connecting device.
  • a connection device may be, for example, a protruding from the edge of the mold portion 23 element which is locked with the housing 2 suitable, for example a clip connection.
  • the housing 2 may have suitable grooves (not shown).
  • an opening 20 is introduced, which is filled with a second damping element 28, for example a plasto-elastic material. This opening 20 will be described in more detail below.
  • the sensor 1 cover 17 and housing 2 are prefabricated, either together on a line or separately.
  • the prefabrication can be done independently.
  • the sensor 1 is manufactured, the first lead is soldered to the glued into the housing 2 transducer element 8. Then the first damping element 16 is inserted.
  • the first supply line 14 may already be carried out in the lid 17 or glued. Then, the housing is closed with the lid 17, the above-mentioned connection possibilities are used.
  • the connection of the connecting element 29 may have been made before or is now made.
  • the sensor 1 may also be equipped with a re-contacted transducer element 8, which in Fig. 2 in a plan view of an open housing 2 is shown only schematically.
  • the transducer element 8 is of a metallic coating 8, which is provided on the top with a parting line 11 in D-shape. As a result, two connection regions are formed, which are each contacted with a supply line 14, 15 in connection points 12, 13.
  • Fig. 3 shows the view of its bottom 19 with the mold portion 23 which extends in a direction on both sides from the center of the lid 17 as a rectangle with rounded corners. Its shape is the contour 6 of the housing 2 (see Fig. 2 ) and may also have other configurations.
  • the passages 25, 26 for the leads 14, 15 of the transducer element 8 are provided in the region of the mold section 23, since this ensures a wider guide.
  • the supply lines can also be injected into the lid 17, which consists for example of a suitable plastic.
  • the opening 20 penetrates the lid as Fig. 4 in a sectional view along the line BB and Fig. 5 along the line AA Fig. 3 shows.
  • the opening 20 has first and second opening portions 21 and 22, wherein the first opening portion is tapered.
  • the inner walls 27 of the opening portions 21, 22 have a continuous edge profile and thus a continuous taper of the lid thickness for the advantageous introduction of vibration in the second damping element 28, which is introduced into the opening 20.
  • the contacting device 30 is arranged on the outside of the mold section 23, the contacting device 30 is arranged. It may also be attached to the underside 19 of the lid 17.
  • the top 18 of the lid 17 is configured just in this embodiment. But it can also have other suitable forms.
  • the invention is not limited to the embodiments described above, but modifiable in a variety of ways.
  • the contacting device 30 may be a combination of insulation displacement connection, spring contact and conductive adhesive.
  • the second damping element 28 can also be created together with the cover 20 in a two-component injection molding process.
  • lid 17 and the housing 2 are connected by a screwing operation with, for example, a quarter turn, wherein the mold portion 23 may have a suitable shape with a cutting lug.

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft einen Ultraschallsensor fĆ¼r ein Fahrzeug und ein entsprechendes Verfahren zum Herstellen eines solchen.The present invention relates to an ultrasonic sensor for a vehicle and a corresponding method for producing the same.

Ultraschallsensoren werden bei Kraftfahrzeugen zum Beispiel als Einparkhilfe eingesetzt, wobei zu diesem Zweck insbesondere eine so genannte NahmessfƤhigkeit in einem Entfemungsbereich von unter 30 cm eine entscheidende funktionale Anforderung ist. Sie bestehen im Allgemeinen aus einem GehƤuse und einem darin angeordneten Wandlerelement (sieche z.b. JP 10 206 528 A ). Das GehƤuse wird Ć¼blicherweise aus einem metallischen Werkstoff, wie zum Beispiel Aluminium, geformt oder gefrƤst. Es wird aus Korrosionsschutz- und LackiergrĆ¼nden mit einem Primer beschichtet. Ein elektromechanisches Wandlerelement (z.B. ein Piezoelement) wird auf den GehƤuseboden aufgebracht, beispielsweise geklebt und kontaktiert. Das GehƤuse wird mit einem dƤmpfenden Material ausgefĆ¼llt. Eine Mƶglichkeit dazu bildet ein eingespritzter Silikonschaum.Ultrasonic sensors are used in motor vehicles, for example, as a parking aid, for which purpose in particular a so-called NahmessfƤhigkeit in a Entfemungsbereich of less than 30 cm is a crucial functional requirement. They consist generally of a housing and a transducer element arranged therein (sieche zb JP 10 206 528 A ). The housing is usually formed or milled from a metallic material, such as aluminum. It is coated for corrosion protection and LackiergrĆ¼nden with a primer. An electromechanical transducer element (eg, a piezoelectric element) is applied to the housing bottom, for example glued and contacted. The housing is filled with a damping material. One possibility is an injected silicone foam.

Diese Herstellungsschritte sind aus verschiedenen GrĆ¼nden technisch nicht trivial. Insbesondere bedĆ¼rfen die chemischen Prozesse des Klebens und SchƤumens exakter Parameter und sind in der Fertigung schwierig umzusetzen. Ein Gleiches gilt fĆ¼r die Kontaktierung der Wandlerelemente mit Bonds, was zum Beispiel mittels Thermokompressions-SchweiƟen (TKS) erfolgt.These manufacturing steps are not technically trivial for a variety of reasons. In particular, the chemical processes of gluing and foaming require precise parameters and are difficult to implement in production. The same applies to the contacting of the transducer elements with bonds, which takes place for example by means of thermocompression welding (TKS).

Anstelle einer AusschƤumung des GehƤuseinnenraums kann man eine BedƤmpfung durch Einlage von Schaumteilen in das GehƤuse erreichen. Dadurch wƤre der Produktionsschritt des AusschƤumens durch einen manuell einfach zu beherrschenden Schritt ersetzt. Allerdings zeigt sich dabei, dass solche Sensoren dadurch ein ungĆ¼nstigeres Ausschwingverhalten im Vergleich zu AusfĆ¼hrungen mit einer AusschƤumung aufweisen, welches die entscheidende funktionale Anforderung nach einer NahmessfƤhigkeit beeintrƤchtigt.Instead of a foaming of the housing interior, one can achieve a damping by inserting foam parts into the housing. As a result, the production step of foaming would be replaced by a step that is easy to control manually. However, it turns out that such sensors are a less favorable Swaying compared to versions with a foaming, which affects the crucial functional requirement for NahumfƤhigkeit.

Durch Messungen der spektralen Anteile der AusschwingvorgƤnge hat sich herausgestellt, dass ein wesentlicher Anteil auf Resonanzen auƟerhalb der Arbeitsfrequenz (48 kHz) des Ultraschallsensors beruht, wobei insbesondere Anteile um 30 kHz und 70 kHz bedeutend sind. Diese werden durch Kipp- und KnautschbewegungsablƤufe in der GehƤusewand verursacht. Zur BedƤmpfung der GehƤusewandschwingungen werden weiterhin. GehƤusefĆ¼llstoffe verwendet, die aus DƤmpfungswerkstoffen bestehen und/oder solche zusƤtzlich enthalten.By measurements of the spectral components of the decay processes, it has been found that a substantial proportion is based on resonances outside the operating frequency (48 kHz) of the ultrasonic sensor, in particular portions of 30 kHz and 70 kHz being significant. These are caused by tilting and KnautschbewegungsablƤufe in the housing wall. To dampen the housing wall vibrations will continue. Housing fillers used, which consist of damping materials and / or contain such additional.

Eine Kontaktierung der Wandlerelemente besteht zum Beispiel darin, dass eine Anschlussleitung an der metallisierten Wandlerelementoberseite des Piezoelementes angebracht wird, wobei die Unterseite des Wandlerelementes mit einem Kleber auf dem Boden des GehƤuses befestigt ist. Das metallische GehƤuse, bzw. die metallische Membran bildet den zweiten Anschluss bzw. die zweite Elektrode (Kathode). An das leitfƤhige GehƤuse (beispielsweise aus Aluminium) wird dann die zweite Anschlussleitung angelƶtet, durch Anbohren der GehƤusewand mit dieser geeignet leitend verbunden oder an einem GehƤusezapfen befestigt, was hinsichtlich der Anzahl von Bauteilen und des Fertigungsaufwands als nachteilig empfunden wird.A contacting of the transducer elements consists for example in that a connecting line is attached to the metallized transducer element top of the piezoelectric element, wherein the underside of the transducer element is fixed with an adhesive on the bottom of the housing. The metallic housing or the metallic membrane forms the second terminal or the second electrode (cathode). The second connecting line is then soldered to the conductive housing (made of aluminum, for example), suitably connected by drilling the housing wall thereto or fastened to a housing journal, which is considered to be disadvantageous in terms of the number of components and the production outlay.

Bei einem anderen Beispiel erfolgt die Kontaktierung der Wandlerelementunterseite durch eine so genannte Umkontaktierung. Dazu wird die Piezokeramikscheibe vollstƤndig mit Silber beschichtet und an der Oberseite ein D-formiger Trennungsschnitt (siehe Fig. 2) der Silberbeschichtung durchgefĆ¼hrt. Dadurch entstehen auf der Oberseite zwei durch Litze, Bonds oder sonstige Leiter kontaktierbare FlƤchen.In another example, the contacting of the transducer element underside is carried out by a so-called Umkontaktierung. For this purpose, the piezoceramic disc is completely coated with silver and at the top a D-shaped separating cut (see Fig. 2 ) of the silver coating. This creates on the top two contactable by strand, bonds or other conductors surfaces.

Nachteilig hierbei ist die nichthomogene Feld-/Kraftverteilung in der Piezokeramik, da die obere FlƤche durch den D-Schnitt nur noch partiell durch den einen (Anoden-) Kontakt bedeckt ist (inhomogener Plattenkondensator). Ein weiterer Nachteil besteht darin, dass bei einer nicht korrekten Klebung (abhƤngig von Dicke der Klebung und Rauhigkeit des Bodens) der Unterseite des Wandlerelementes zum Boden des GehƤuses das GehƤuse durch die Umkontaktierung nicht an Masse (GND bzw. Ground) kontaktiert ist und der Sensor unerwĆ¼nscht als kapazitiver Sensor arbeiten kann, wobei er empfindlich auf elektrische Stƶrfelder ist. AuƟerdem wird es als nachteilig empfunden, dass auf der Oberseite des Wandlerelementes durch die Umkontaktierung zwei Kontakte im Bereich der Nutzschwingung erzeugt sind. Nebst Beeinflussung durch den Kontakt im Sinne eines gekoppelten Schwingers entsteht in der Praxis eine Verringerung der Resonanzfrequenz proportional zum Massebeitrag der Kontaktierung (zum Beispiel Lƶtpunkte). Aus diesem Grund ist in der Serie ThermokompressionsschweiƟen mit geringem Massebeitrag funktional vorteilhaft.The disadvantage here is the non-homogeneous field / force distribution in the piezoceramic, since the upper surface is only partially covered by the D-section through the one (anode) contact (inhomogeneous plate capacitor). A further disadvantage is that, in the case of an incorrect bonding (depending on the thickness of the bonding and roughness of the bottom) of the underside of the transducer element to the bottom of the housing, the housing is not contacted by the Umkontaktierung to ground (GND or ground) and the sensor undesirable to work as a capacitive sensor, where he is sensitive to electrical interference. In addition, it is considered to be disadvantageous that two contacts in the region of the useful vibration are generated on the top of the transducer element by the Umkontaktierung. In addition to being influenced by the contact in the sense of a coupled oscillator, in practice a reduction in the resonant frequency is proportional to the mass contribution of the contacting (for example soldering points). For this reason, thermocompression welding with low mass contribution is functionally advantageous in the series.

Die JP 2002238095 A beschreibt einen Ultraschallsensor mit einem Deckel, wobei das GehƤuse einerseits glattwandig und andererseits mit Abstufungen ausgebildet ist, die erhƶhten Fertigungsaufwand benƶtigen. Der Deckel kann in dem GehƤuse versetzt eingebracht sein, um bestimmten Schwingungsmoden zu dƤmpfen, wobei die Einstellung dieser Position erhƶhten Aufwand bedeutet. Der Deckel ist glattflƤchig, wobei er dicker als die Topfmembran ausgefĆ¼rt ist, aber ansonsten keine nƤher spezifizierten. AusfrƤsungen oder Auswƶlbungen besitzt. Das Konzept sieht vor, den einseitig freien Schwinger "Topfwand" an der Oberseite hart zu lagern und damit eine beidseitig aufgehƤngte Biegewelle zu erzeugen (Drawing 6 und 7). Der Deckel wird verklebt. Die AnschlĆ¼sse sind an dem Wandlerelement und an dem GehƤuse in nicht nƤher beschriebener Weise angebracht.The JP 2002238095 A describes an ultrasonic sensor with a lid, wherein the housing is formed on the one hand smooth-walled and on the other hand with gradations that require increased manufacturing costs. The cover may be staggered in the housing to dampen certain vibration modes, the adjustment of this position means increased expense. The lid has a smooth surface, whereby it is made thicker than the pot membrane, but otherwise not specified. Has cut-outs or bulges. The concept is to store the unilaterally free oscillator "pot wall" at the top hard and thus produce a bilaterally suspended bending shaft (Drawing 6 and 7). The lid is glued. The terminals are attached to the transducer element and to the housing in unspecified manner.

Die DE 296 14 691 U 1 beschreibt einen Ultraschallsensor, bei welchem oberhalb eines Wandlerelementes eine Filzeinlage von einer Deckscheibe gehalten ist. Die Kontaktierung des Wandlerelementes erfolgt Ć¼ber einen Direktanschluss und Ć¼ber einen in einem Beschwerungsring eingesetzten Kontaktstift. Der Aufbau ist aufwƤndig und schlieƟt die Konstruktion einer vorgespannten Teflonfolie ein.The DE 296 14 691 U 1 describes an ultrasonic sensor in which a felt insert is held by a cover disk above a transducer element. The contacting of the transducer element takes place via a direct connection and via a contact pin inserted in a weighting ring. The structure is complex and includes the construction of a prestressed Teflon film.

In der DE 197 54 891 C1 ist ein Ultraschallwandler beschrieben, welcher Ć¼ber einem Wandlerelement zwei DƤmpfungsstoffe aufweist. Die WandstƤrke des GehƤuses ist gegenĆ¼ber der Membran groƟ, wobei diese GehƤusewand einen Kontaktstift enthƤlt.In the DE 197 54 891 C1 an ultrasonic transducer is described, which has two damping substances over a transducer element. The wall thickness of the housing is large with respect to the membrane, said housing wall containing a contact pin.

Die DE 101 25 272 A1 beschreibt einen Ultraschallsensor und sein Herstellverfahren. Sein Wandlerelement ist von drei unterschiedlichen Lagen bedeckt, wobei ein Deckel drei GehƤuseteile Ć¼berdeckt. Ein leitender GehƤuseteil, der die Membran bildet, ist mit einem verstemmten Anschluss versehen. Diese Schrift bezieht sich allein auf die Erzeugung des Entkopplungsrings zwischen schwingender Membran und GehƤuse durch Umspritzung mit Silikon.The DE 101 25 272 A1 describes an ultrasonic sensor and its manufacturing method. Its transducer element is covered by three different layers, wherein a cover covers three housing parts. A conductive housing part, which forms the membrane, is provided with a caulked connection. This writing refers only to the Generation of decoupling ring between oscillating membrane and housing by encapsulation with silicone.

Ein Ultraschallwandler, der in der DE 197 44 229 A1 beschrieben ist, weist ein GehƤuse mit einem Wulst und einem das GehƤuse verschlieƟenden Entkopplungsring auf. Der Entkopplungsring bildet in einer AusfĆ¼hrung gleichzeitig einen Einsatz als DƤmpfungsmaterial innerhalb des GehƤuses. In einer anderen AusfĆ¼hrung weist er eine zylindrische Durchgangsƶffnung auf, die mit einem DƤmpfungsstoff angefĆ¼llt ist. Eine nƤhere Spezifizierung der Durchgangsƶffnung hinsichtlich ihrer Geometrie und Funktion wird nicht gegeben. Der Entkopplungsring dient gleichzeitig als Halterung fĆ¼r die AnschlĆ¼sse des Wandlerelementes, wobei Anschluss des GehƤuses vorhanden ist.An ultrasonic transducer used in the DE 197 44 229 A1 has a housing with a bead and a housing closing decoupling ring on. The decoupling ring forms in one embodiment simultaneously use as a damping material within the housing. In another embodiment, it has a cylindrical passage opening which is filled with a damping material. A closer specification of the passage opening in terms of their geometry and function is not given. The decoupling ring also serves as a holder for the terminals of the transducer element, wherein connection of the housing is present.

Die DE 44 34 692 A1 ist ein Beispiel zur Illustration der Befestigung einer Piezokeramik mit Leitkleber auf einer Metallplatte eines Ultraschallsensors.The DE 44 34 692 A1 is an example illustrating the attachment of a piezoceramic with conductive adhesive on a metal plate of an ultrasonic sensor.

Offenbarung der ErfindungDisclosure of the invention

Der erfindungsgemƤƟe Ultraschallsensor weist demgegenĆ¼ber den Vorteil auf, dass er mit einer geringen Anzahl an Bauteilen die Anforderungen an die entscheidende NahmessfƤhigkeit erfĆ¼llt. Ein weiterer Vorteil besteht darin, dass die Bauteile so gestaltet sind, dass eine Herstellung des Ultraschallsensors keine schwer zu beherrschenden Prozesse aufweist und eine manuelle Fertigung in einfacher Weise ermƶglicht wird.In contrast, the ultrasonic sensor according to the invention has the advantage that it meets the requirements of the decisive NahmessfƤhigkeit with a small number of components. Another advantage is that the components are designed so that a production of the ultrasonic sensor has no difficult-to-control processes and manual production is made possible in a simple manner.

Der Kern der Erfindung besteht darin, dass der Ultraschallsensor ein GehƤuse aufweist, das mit einem Deckel verschlossen ist, der gleichzeitig ein DƤmpfungselement beinhaltet, die DurchfĆ¼hrung der Anschlussleitung und die Kontaktierung des GehƤuses in einfacher Weise ermƶglicht. Bei der Herstellung wird in das GehƤuse ein weiteres DƤmpfungselement eingelegt.The essence of the invention is that the ultrasonic sensor has a housing which is closed by a lid, which at the same time includes a damping element, allows the implementation of the connecting line and the contacting of the housing in a simple manner. During manufacture, another damping element is inserted into the housing.

Ein besonderer Vorteil besteht darin, dass der Deckel eine Geometrieform aufweist, welche dergestalt ausgefĆ¼hrt ist, dass stƶrenden Wandwellen mƶglichst ohne Reflexion in das in ihm eingebrachte plastische DƤmpfungselement eingeleitet werden.A particular advantage is that the cover has a geometry shape which is designed in such a way that disturbing wall waves are introduced, if possible, without reflection into the plastic damping element introduced into it.

GemƤƟ der Erfindung weist der Ultraschallsensor, insbesondere fĆ¼r ein Fahrzeug, mit einem GehƤuse Folgendes auf:

  • ein im GehƤuse auf dessen Boden angebrachtes Wandlerelement zur Erzeugung von Ultraschallschwingungen;
  • ein im GehƤuse angeordnetes erstes DƤmpfungselement zur SchwingungsdƤmpfung des Bodens; und
  • einen Deckel zum Verschluss des GehƤuses,
  • wobei der Deckel mit einem zweiten DƤmpfungselement versehen ist und im Bereich des zweiten DƤmpfungselementes eine stetige VerjĆ¼ngung der Deckeldicke aufweist.
According to the invention, the ultrasonic sensor, in particular for a vehicle, with a housing has the following:
  • a transducer element mounted on the bottom of the housing for generating ultrasonic vibrations;
  • a housing disposed in the first damping element for vibration damping of the soil; and
  • a lid to the closure of the housing,
  • wherein the lid is provided with a second damping element and in the region of the second damping element has a continuous taper of the lid thickness.

Das GehƤuse ist mit einem Deckel verschlossen, dessen Kontur dem Verlauf der GehƤuseinnenwand angepasst ist, um einen schlĆ¼ssigen Ɯbergang der Wandschwingung in den Deckel zu erreichen.The housing is closed with a lid whose contour is adapted to the course of the housing inner wall in order to achieve a smooth transition of the wall vibration in the lid.

Der Deckel ist mit dem GehƤuse mittels eines Klebers verbunden. FĆ¼r eine einfache Herstellung ist vorteilhaft vorgesehen, dass die Verbindung des Deckels mit dem GehƤuse mittels eines von dem Rand des Formabschnitts hervorstehenden Verbindungselementes in Zusammenwirkung mit einer korrespondierenden Aufnahme im GehƤuse kraftschlĆ¼ssig ausgebildet ist. Dies kann beispielsweise eine so genannt Klipsverbindung sein. Zwischen Deckel und Topfwand ist ein umlaufender Kraftschluss vorgesehen.The lid is connected to the housing by means of an adhesive. For ease of manufacture, it is advantageously provided that the connection of the cover to the housing by means of a protruding from the edge of the mold section connecting element in cooperation with a corresponding receptacle in the housing is formed non-positively. This can be, for example, a so-called clip connection. Between the lid and the pot wall, a circumferential traction is provided.

Hierdurch werden die GehƤuseschwingungen an der Oberseite der GehƤusewand nicht durch eine harte AufhƤngung unterbunden, sondern mƶglichst an die mechanische Impedanz angepasst in thermische Energie im zweiten DƤmpfungselement umgewandelt.As a result, the housing oscillations are not prevented by a hard suspension at the top of the housing wall, but as possible adapted to the mechanical impedance converted into thermal energy in the second damping element.

Der Deckel ist mit einer durchgehenden Ɩffnung versehen, in welcher das DƤmpfungselement angeordnet ist, wobei die Ɩffnung einen stetigen Kantenverlauf ihrer Innenwand aufweist. Durch den stetigen Kantenverlaufwird erreicht, dass die in den Deckel Ć¼bertragenen Wandschwingungen angepasst in dieses DƤmpfungselement wandern und dort in thermische Energie umgewandelt werden, wobei sie bedƤmpft ausschwingen.The lid is provided with a through opening in which the damping element is arranged, wherein the opening has a continuous edge profile of its inner wall. The continuous edge course ensures that the wall vibrations transmitted into the cover are adapted to migrate into this damping element where they are converted into thermal energy, whereby they swing out in a damped way.

Der Deckel ist mit DurchfĆ¼hrungen fĆ¼r Anschlussleitungen des Wandlerelementes versehen. Weiterhin weist der Deckel mindestens eine Kontaktiereinrichtung fĆ¼r eine elektrisch leitende Verbindung zwischen einem Anschlusselement und dem GehƤuse auf. Damit wird vorteilhaft erreicht, dass einerseits ein Wandlerelement verwendet werden kann, das nur einseitig metallisiert ist, wobei die untere Elektrode durch das leitfƤhige GehƤuse gebildet wird. Andererseits besteht der Vorteil, dass beim Aufbringen des Deckels auf das GehƤuse gleichzeitig eine Kontaktierung des GehƤuses erfolgt, wodurch zusƤtzliche Bearbeitungen des GehƤuses entfallen und die Herstellung vereinfacht wird.The cover is provided with feedthroughs for connection lines of the transducer element. Furthermore, the lid has at least one contacting device for a electrically conductive connection between a connection element and the housing. This advantageously achieves that on the one hand a transducer element can be used, which is only metallized on one side, wherein the lower electrode is formed by the conductive housing. On the other hand, there is the advantage that when applying the lid to the housing at the same time a contacting of the housing takes place, thereby eliminating additional processing of the housing and the production is simplified.

Dazu ist es bevorzugt, dass die Kontaktiereinrichtung als eine Schneidklemmkonstruktion oder als ein Federkontakt ausgebildet ist. In bevorzugter Weise ist die Schneidklemmkonstruktion im Deckel integriert.For this purpose, it is preferred that the contacting device is designed as an insulation displacement construction or as a spring contact. Preferably, the insulation displacement structure is integrated in the lid.

Alternativ kann die Kontaktiereinrichtung ein Leitkleber sein, wobei der Vorteil besteht, dass der Leitkleber gleichzeitig die kraftschlĆ¼ssige Verbindung des Deckels mit dem GehƤuse bildet.Alternatively, the contacting can be a conductive adhesive, with the advantage that the conductive adhesive simultaneously forms the non-positive connection of the lid with the housing.

Eine weitere AusfĆ¼hrungsform sieht vor, dass der AuƟendurchmesser des Deckels zur Halterung eines Entkopplungsrings etwas grĆ¶ĆŸer als der AuƟendurchmesser des GehƤuses ausgebildet ist. Dadurch wird die Einsatzmƶglichkeit des Sensors fĆ¼r weitere Anwendungen vergrĆ¶ĆŸert. Die Notwendigkeit einer Haltewulst bzw. Nut an der metallischen GehƤusewand entfƤllt somit. Darin besteht ein weiterer Vorteil, dass die mechanische Impedanz der Wand nicht verƤndert ist.A further embodiment provides that the outer diameter of the cover for holding a decoupling ring is slightly larger than the outer diameter of the housing. This increases the possibility of using the sensor for other applications. The need for a retaining bead or groove on the metallic housing wall is thus eliminated. There is another advantage in that the mechanical impedance of the wall is not changed.

Somit besitzt das GehƤuse besitzt vorteilhafterweise keinen Wulst oder Nut. Dadurch werden eine Ƅnderung der mechanischen Impedanz der GehƤusewand und damit eine Reflexionsstelle fĆ¼r Schwingungen in der GehƤusewand vermieden.Thus, the housing advantageously has no bead or groove. As a result, a change in the mechanical impedance of the housing wall and thus a reflection point for vibrations in the housing wall are avoided.

Zur Vermeidung einer Oberschwingung von ca. 54 kHz ist vorgesehen, dass das erste DƤmpfungselement als ein in das GehƤuse einlegbares offenporiges Schaumeinlagebauteil ausgebildet ist. Dies kann vor Verschluss des GehƤuses manuell in einfacher Weise erfolgen.To avoid a harmonic of about 54 kHz is provided that the first damping element is designed as an insertable into the housing open-pore foam insert component. This can be done manually in a simple manner before closing the housing.

Ein erfindungsgemƤƟes Verfahren zum Herstellen eines oben beschriebenen Ultraschallsensors nach weist folgende Verfahrensschritte auf:

  • (V1) Anfertigen des Deckels und Einbringen des zweiten DƤmpfungselementes in die Ɩffnung des Deckels;
  • (V2) Bearbeiten des teilbestĆ¼ckten GehƤuses; und
  • (V3) Herstellen des Ultraschallsensors durch VerschlieƟen des GehƤuses mit dem Deckel.
A method according to the invention for producing an ultrasound sensor described above has the following method steps:
  • (V1) making the lid and inserting the second damping element in the opening of the lid;
  • (V2) machining the partially populated housing; and
  • (V3) Manufacture the ultrasonic sensor by closing the housing with the lid.

Dabei ist bevorzugt, dass beim Bearbeiten des teilbestĆ¼ckten GehƤuses die Anschlussleitungen an die entsprechenden Anschlusspunkte angelƶtet werden und danach das erste DƤmpfungselement in das GehƤuse eingelegt wird.It is preferred that when editing the partially populated housing, the connection cables are soldered to the corresponding connection points and then the first damping element is inserted into the housing.

Es ergeben sich folgende Vorteile.There are the following advantages.

Der Ultraschallsensor bleibt auf seiner Arbeitsfrequenz 48 kHz niederohmig und damit effizient. Dies erfolgt durch die gezielte BedƤmpfung der Membran mit dem Einlegeteil 1. Er ist mit kleineren Sendespannungen ansteuerbar und hat im Mikrofonbereich hƶhere Generatorspannungen. Ersteres ist gleichbedeutend mit einem verringerten Risiko von Depolarisation der Piezokeramik, geringeres Ɯbersteuern eines Ɯbertragers in die NichtlinearitƤt bzw. die Mƶglichkeit eines kleineren Ɯbertrager-ƜbersetzungsverhƤltnisses und dadurch der Einsatz einer kleiner dimensionierten Treiberstufe.The ultrasonic sensor remains at its operating frequency 48 kHz low impedance and thus efficient. This is done by selective attenuation of the membrane with the insert 1. It can be controlled with smaller transmission voltages and has higher generator voltages in the microphone range. The former is synonymous with a reduced risk of depolarization of the piezoceramic, less overdriving a transformer in the non-linearity or the possibility of a smaller transformer gear ratio and thereby the use of a smaller sized driver stage.

Das schwer zu beherrschende Reaktionsgleichgewicht zwischen Treibmittelausdehnung und AdhƤsion eines Silikons beim SchƤumprozess desselben wird durch einen einfachen mechanischen FĆ¼geprozess des Deckels ersetzt.The difficult-to-control reaction equilibrium between propellant expansion and adhesion of a silicone in the foaming process of the same is replaced by a simple mechanical joining process of the lid.

Der Deckel selbst kann als Vorprodukt mit seinem eingebrachten DƤmpfungswerkstoff unabhƤngig von Taktzeiten der Sensorfertigung vorproduziert werden, Pufferungen einer einstrƤngigen Produktionslinie kƶnnen vermieden werden. Dieser DƤmpfungswerkstoff kann gezielt fĆ¼r die Wandschwingungen ausgelegt werden.The lid itself can be preproduced as a precursor with its introduced damping material regardless of cycle times of the sensor manufacturing, buffering a single-stranded production line can be avoided. This damping material can be designed specifically for the wall vibrations.

Der Verzicht auf den Wulst beim GehƤuse bedeutet Vorteile bei der Rohfertigung des GehƤuses durch FlieƟpressen.The waiver of the bead in the case means advantages in the rough production of the housing by extrusion.

Durch die hohe Sendewirkung und verbesserten Rausch-/StƶrabstƤnde beim Empfang ist der Sensor gut geeignet zur Realisierung grĆ¶ĆŸerer Reichweiten fĆ¼r erweiterte Funktionen wie ParklĆ¼ckenvermessung, Ɯberwachung toter Winkel, LSF usw.Due to the high transmission efficiency and improved noise / noise margins when receiving, the sensor is well suited for realizing larger ranges for advanced functions such as parking space measurement, blind spot monitoring, LSF, etc.

Die NahmessfƤhigkeit des erfindungsgemƤƟen Sensors verbessert sich durch den Deckeleinsatz bei einem ungeschƤumten GehƤuse von ca. 28...30 cm auf ca. 22...23 cm auf dem plausibilisierten binƤren Signal.The NahmesfƤhigkeit the sensor of the invention improves by the lid insert in a non-foamed housing of about 28 ... 30 cm to about 22 ... 23 cm on the plausibilized binary signal.

Weitere Vorteile und Merkmale der Erfindung sind der Beschreibung und den Zeichnungen entnehmbar.Further advantages and features of the invention, the description and the drawings can be removed.

Zeichnungendrawings

Die Erfindung wird nachfolgend anhand des in den Figuren der Zeichnung angegebenen AusfĆ¼hrungsbeispiels nƤher erlƤutert.The invention will be explained in more detail with reference to the embodiment shown in the figures of the drawing.

Es zeigt dabei.

  • FIG. 1 eine schematische Schnittdarstellung eines beispielhaften Ultraschallsensors gemƤƟ der Erfindung;
  • FIG. 2 eine Draufsicht auf das GehƤuse ohne Deckel eines Sensors mit einem umkontaktierten Wandlerelement;
  • FIG. 3 eine Draufsicht auf die Unterseite des Deckels des Sensors nach Fig. 1;
  • FIG. 4 eine Schnittdarstellung des Deckels nach Fig. 3 lƤngs Linie B-B; und
  • FIG. 5 eine Schnittdarstellung des Deckels nach Fig. 3 lƤngs Linie A-A.
It shows.
  • FIG. 1 a schematic sectional view of an exemplary ultrasonic sensor according to the invention;
  • FIG. 2 a plan view of the housing without a lid of a sensor with a re-contacted transducer element;
  • FIG. 3 a plan view of the underside of the lid of the sensor after Fig. 1 ;
  • FIG. 4 a sectional view of the lid after Fig. 3 along line BB; and
  • FIG. 5 a sectional view of the lid after Fig. 3 along line AA.

Beschreibung der AusfĆ¼hrungsbeispieleDescription of the embodiments

Gleiche oder Ƥhnliche Bauteile mit gleichen oder Ƥhnlichen Funktionen sind in den Figuren mit gleichen Bezugszeichen versehen.The same or similar components with the same or similar functions are provided in the figures with the same reference numerals.

In Fig. 1 ist ein erfindungsgemƤƟer Sensor 1 in einer Schnittdarstellung als ein AusfĆ¼hrungsbeispiel gezeigt. Ein GehƤuse 2 weist einen Boden 5 als Membran auf. Weiterhin besitzt das GehƤuse 2 an seiner Oberseite einen Rand 4 mit einer Ɩffnung mit einer Kontur 6 (siehe Fig. 2), in die ein Deckel 17 eingesetzt ist. Das GehƤuse 2 ist vorzugsweise ein flieƟgepresstes Aluminiumteil.In Fig. 1 an inventive sensor 1 is shown in a sectional view as an embodiment. A housing 2 has a bottom 5 as a membrane. Furthermore, the housing 2 has on its upper side an edge 4 with an opening with a contour 6 (see Fig. 2 ), in which a lid 17 is inserted. The housing 2 is preferably a die-pressed aluminum part.

Im Inneren des GehƤuses 2 ist ein Wandlerelement 8 mittels eines Verbindungselementes 7, hier ein Kleber, auf dem Boden des GehƤuses 2 befestigt. Das Wandlerelement 8 besitzt nur eine einseitige erste Beschichtung 9 aus einem geeigneten Metall, beispielsweise Silber. Die Beschichtung 9 ist Ć¼ber eine Lƶtung in einem ersten Anschlusspunkt 12 mit einer ersten Zuleitung 14 verbunden. Auch Wandlerelemente 8, bei denen eine zweite Beschichtung 10 an ihrer Unterseite vorhanden ist, kƶnnen verwendet werden, wobei das Verbindungselement 7 dann als ein Leitkleber ausgebildet ist.Inside the housing 2, a transducer element 8 is fastened by means of a connecting element 7, here an adhesive, on the bottom of the housing 2. The transducer element 8 has only a one-sided first coating 9 made of a suitable metal, for example silver. The coating 9 is connected via a soldering in a first connection point 12 to a first supply line 14. Also transducer elements 8, in which a second coating 10 is present on its underside, can be used, wherein the connecting element 7 is then formed as a conductive adhesive.

Ɯber dem Wandlerelement 8 ist ein erstes DƤmpfungselement 16 eingelegt zur BedƤmpfung der Schwingung der Membran. Die erste Zuleitung 14 ist entweder um das erste DƤmpfungselement 16 herum oder in einer Ausbuchtung oder einem Einschnitt des DƤmpfungselementes 16 verlegt.About the transducer element 8, a first damping element 16 is inserted for damping the vibration of the membrane. The first lead 14 is laid either around the first damping element 16 around or in a bulge or an incision of the damping element 16.

Die Kontaktierung des GehƤuses 2 zum Anschluss der Unterseite des Wandlerelementes 8 wird durch eine Kontaktiereinrichtung 30 gebildet, welche sich an der Unterseite des Deckels 17 an einem Formabschnitt 23 befindet. Diese Kontaktiereinrichtung 30 kann zum Beispiel als eine Schneidklemmkonstruktion, Federkonstruktion, oder in einfacher Weise ein Leitkleber, ausgefĆ¼hrt sein. Der Leitkleber kann auch gleichzeitig eine kraftschlĆ¼ssige Verbindung des Deckels 17 mit dem GehƤuse 2 bilden. Die Kontaktiereinrichtung 30 ist innerhalb des Deckels 17 mit einem Anschlusselement 29 verbunden, das in diesem Beispiel Ć¼ber dem Deckel 17 hervorsteht, an welches eine zweite Zuleitung zum Beispiel durch Lƶtung anschlieƟbar ist.The contacting of the housing 2 for connection of the underside of the transducer element 8 is formed by a contacting device 30, which is located on the underside of the lid 17 on a mold section 23. This contacting device 30 can be embodied, for example, as an insulation displacement construction, spring construction, or simply a conductive adhesive. The conductive adhesive can also form a frictional connection of the lid 17 with the housing 2 at the same time. The contacting device 30 is connected within the lid 17 with a connection element 29, which in this example protrudes beyond the lid 17, to which a second supply line can be connected, for example by soldering.

Der Deckel 17 verschlieƟt das GehƤuse 2, indem sein Formabschnitt 23 formschlĆ¼ssig in die Kontur 6 der GehƤuseƶffnung eingesetzt ist. Eine kraftschlĆ¼ssige Verbindung kann mittels eines Klebers und/oder einer Verbindungseinrichtung erfolgen. Eine solche Verbindungseinrichtung kann beispielsweise ein vom Rand des Formabschnitts 23 hervorstehendes Element sein, das mit dem GehƤuse 2 geeignet verrastet, zum Beispiel eine Klipsverbindung. Dabei kann das GehƤuse 2 geeignete Nuten (nicht gezeigt) aufweisen.The cover 17 closes the housing 2 by its form portion 23 is positively inserted into the contour 6 of the housing opening. A frictional connection can be made by means of an adhesive and / or a connecting device. Such a connection device may be, for example, a protruding from the edge of the mold portion 23 element which is locked with the housing 2 suitable, for example a clip connection. In this case, the housing 2 may have suitable grooves (not shown).

In dem Deckel 17 ist eine Ɩffnung 20 eingebracht, welche mit einem zweiten DƤmpfungselement 28 gefĆ¼llt ist, zum Beispiel ein plasto-elastisches Material. Diese Ɩffnung 20 wird weiter unten noch ausfĆ¼hrlicher beschrieben.In the lid 17, an opening 20 is introduced, which is filled with a second damping element 28, for example a plasto-elastic material. This opening 20 will be described in more detail below.

Zum Herstellen des Sensors 1 werden Deckel 17 und GehƤuse 2 vorgefertigt, entweder zusammen auf einer Linie oder auch separat. Die Vorfertigung kann unabhƤngig voneinander erfolgen.To produce the sensor 1 cover 17 and housing 2 are prefabricated, either together on a line or separately. The prefabrication can be done independently.

Der Sensor 1 wird hergestellt, die erste Zuleitung an das in das GehƤuse 2 eingeklebte Wandlerelement 8 angelƶtet wird. Daraufhin wird das erste DƤmpfungselement 16 eingelegt. Die erste Zuleitung 14 kann sich schon im Deckel 17 durchgefĆ¼hrt oder auch eingeklebt befinden. Dann wird das GehƤuse mit dem Deckel 17 verschlossen, wobei die oben angefĆ¼hrten Verbindungsmƶglichkeiten benutzt werden. Der Anschluss des Anschlusselementes 29 kann vorher erfolgt sein oder wird jetzt vorgenommen.The sensor 1 is manufactured, the first lead is soldered to the glued into the housing 2 transducer element 8. Then the first damping element 16 is inserted. The first supply line 14 may already be carried out in the lid 17 or glued. Then, the housing is closed with the lid 17, the above-mentioned connection possibilities are used. The connection of the connecting element 29 may have been made before or is now made.

Der Sensor 1 kann auch mit einem umkontaktierten Wandlerelement 8 ausgerĆ¼stet sein, was in Fig. 2 in einer Draufsicht auf ein geƶffnetes GehƤuse 2 nur schematisch gezeigt ist. Das Wandlerelement 8 ist von einer metallischen Beschichtung 8, die auf der Oberseite mit einer Trennfuge 11 in D-Form versehen ist. Dadurch sind zwei Anschlussbereiche gebildet, die jeweils mit einer Zuleitung 14, 15 in Anschlusspunkten 12, 13 kontaktiert sind.The sensor 1 may also be equipped with a re-contacted transducer element 8, which in Fig. 2 in a plan view of an open housing 2 is shown only schematically. The transducer element 8 is of a metallic coating 8, which is provided on the top with a parting line 11 in D-shape. As a result, two connection regions are formed, which are each contacted with a supply line 14, 15 in connection points 12, 13.

Im Folgenden wird der Deckel 17 ausfĆ¼hrlicher beschrieben. Fig. 3 zeigt die Ansicht seiner Unterseite 19 mit dem Formabschnitt 23, der sich in einer Richtung beidseitig von der Mitte des Deckels 17 als ein Rechteck mit abgerundeten Ecken erstreckt. Seine Form ist der Kontur 6 des GehƤuses 2 (siehe Fig. 2) angepasst und kann auch andere Ausgestaltungen aufweisen. Die DurchfĆ¼hrungen 25, 26 fĆ¼r die Zuleitungen 14, 15 des Wandlerelementes 8 sind im Bereich des Formabschnitts 23 vorgesehen, da so eine breitere FĆ¼hrung gewƤhrleistet ist. Die Zuleitungen kƶnnen auch schon in den Deckel 17, der zum Beispiel aus einem geeigneten Kunststoff besteht, eingespritzt sein.Hereinafter, the lid 17 will be described in more detail. Fig. 3 shows the view of its bottom 19 with the mold portion 23 which extends in a direction on both sides from the center of the lid 17 as a rectangle with rounded corners. Its shape is the contour 6 of the housing 2 (see Fig. 2 ) and may also have other configurations. The passages 25, 26 for the leads 14, 15 of the transducer element 8 are provided in the region of the mold section 23, since this ensures a wider guide. The supply lines can also be injected into the lid 17, which consists for example of a suitable plastic.

Die Ɩffnung 20 durchdringt den Deckel wie Fig. 4 in einer Schnittdarstellung lƤngs der Linie B-B und Fig. 5 lƤngs der Linie A-A nach Fig. 3 zeigt. Die Ɩffnung 20 weist einen ersten und zweiten Ɩffnungsabschnitt 21 und 22 auf, wobei der erste Ɩfhungsabschnitt kegelfƶrmig ausgebildet ist. Die InnenwƤnde 27 der Ɩffnungsabschnitte 21, 22 besitzen einen stetigen Kantenverlauf und damit eine stetige VerjĆ¼ngung der Deckeldicke zur vorteilhaften Schwingungseinleitung in das zweite DƤmpfungselement 28, welches in der Ɩffnung 20 eingebracht ist.The opening 20 penetrates the lid as Fig. 4 in a sectional view along the line BB and Fig. 5 along the line AA Fig. 3 shows. The opening 20 has first and second opening portions 21 and 22, wherein the first opening portion is tapered. The inner walls 27 of the opening portions 21, 22 have a continuous edge profile and thus a continuous taper of the lid thickness for the advantageous introduction of vibration in the second damping element 28, which is introduced into the opening 20.

An der AuƟenseite des Formabschnitts 23 ist die Kontaktiereinrichtung 30 angeordnet. Sie kann auch an der Unterseite 19 des Deckels 17 angebracht sein. Die Oberseite 18 des Deckels 17 ist in dieser AusfĆ¼hrung eben ausgestaltet. Sie kann aber auch andere geeignete Formen aufweisen.On the outside of the mold section 23, the contacting device 30 is arranged. It may also be attached to the underside 19 of the lid 17. The top 18 of the lid 17 is configured just in this embodiment. But it can also have other suitable forms.

Die Erfindung ist nicht auf die oben beschriebenen AusfĆ¼hrungsbeispiele, beschrƤnkt, sondern auf vielfƤltige Art und Weise modifizierbar.The invention is not limited to the embodiments described above, but modifiable in a variety of ways.

Es ist beispielsweise mƶglich, dass die Kontaktiereinrichtung 30 eine Kombination aus Schneidklemmverbindung, Federkontakt und Leitkleber sein kann.It is for example possible that the contacting device 30 may be a combination of insulation displacement connection, spring contact and conductive adhesive.

Weiterhin sind andere Formen der Ɩffnung 20 denkbar.Furthermore, other forms of the opening 20 are conceivable.

Das zweite DƤmpfungselement 28 kann auch zusammen mit dem Deckel 20 in einem Zweikomponenten-Spritzgussverfahren erstellt werden.The second damping element 28 can also be created together with the cover 20 in a two-component injection molding process.

Es ist auch denkbar, dass der Deckel 17 und das GehƤuse 2 durch einen Verschraubvorgang mit zum Beispiel einer Viertelumdrehung, verbunden werden, wobei der Formabschnitt 23 eine geeignete Form mit einem Schneidansatz aufweisen kann.It is also conceivable that the lid 17 and the housing 2 are connected by a screwing operation with, for example, a quarter turn, wherein the mold portion 23 may have a suitable shape with a cutting lug.

Claims (13)

  1. Ultrasound sensor (1), in particular for a vehicle, having a housing (2) which has the following:
    - a transducer element (8) which is mounted in the housing (2) on the base (5) thereof and which serves for generating ultrasound vibrations;
    - a first damping element (16) which is arranged in the housing (2) and which serves for damping vibrations of the base (5); and
    - a cover (17) for closing off the housing (2), wherein the cover (17) is provided with a second damping element (28) and has a continuous tapering of the cover thickness in the region of the second damping element (28).
  2. Ultrasound sensor (1) according to Claim 1,
    characterized
    in that the cover (17) has, on its underside (19), a shaped portion (23) for positively locking connection to a corresponding contour (6) of the housing (2).
  3. Ultrasound sensor (1) according to Claim 2,
    characterized
    in that the connection of the cover (17) to the housing (2) is formed by means of a connecting element, which projects from the edge of the shaped portion (23), in interaction with a corresponding receptacle in the housing (2), and/or is of non-positively locking form with an adhesive.
  4. Ultrasound sensor (1) according to one of Claims 1 to 3,
    characterized
    in that the second damping element (28) is arranged in an opening (20) of the cover (17), wherein the opening (20) has a continuous edge profile of its inner wall (27).
  5. Ultrasound sensor (1) according to one of Claims 1 to 4,
    characterized
    in that the cover (17) has at least one leadthrough (25, 26) for connecting lines of the transducer element (8).
  6. Ultrasound sensor (1) according to one of Claims 1 to 5,
    characterized
    in that the cover (17) has at least one contacting device (30) for an electrically conductive connection between a terminal element (29) and the housing (2).
  7. Ultrasound sensor (1) according to Claim 6,
    characterized
    in that the contacting device (30) is in the form of an insulation displacement terminal construction or is formed as a spring contact.
  8. Ultrasound sensor (1) according to Claim 6,
    characterized
    in that the contacting device (30) is a conductive adhesive.
  9. Ultrasound sensor (1) according to one of Claims 1 to 8,
    characterized
    in that the outer diameter of the cover (17) is formed, in order to hold a decoupling ring, so as to be slightly larger than the outer diameter of the housing (2).
  10. Ultrasound sensor (1) according to one of Claims 1 to 9,
    characterized
    in that the first damping element (16) is formed as an open-pored foam insert component which can be inserted into the housing (2).
  11. Ultrasound sensor (1) according to one of Claims 1 to 10,
    characterized
    in that the housing (2) has a smooth outer wall (3).
  12. Method for producing an ultrasound sensor (1) according to one of Claims 1 to 11, having the following method steps:
    (V1) manufacturing the cover (17) and inserting the second damping element (28) into the opening (20) of the cover;
    (V2) processing the partially assembled housing (2); and
    (V3) producing the ultrasound sensor (1) by closing off the housing (2) by means of the cover (17).
  13. Method according to Claim 12,
    characterized
    in that, during the processing of the partially assembled housing (2), the connecting lines (14, 15) are soldered to the corresponding connecting points, and the first damping element (16) is subsequently inserted into the housing (2).
EP07712104A 2006-03-10 2007-01-25 Ultrasonic sensor Not-in-force EP1997100B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006011155A DE102006011155A1 (en) 2006-03-10 2006-03-10 ultrasonic sensor
PCT/EP2007/050719 WO2007104594A1 (en) 2006-03-10 2007-01-25 Ultrasonic sensor

Publications (2)

Publication Number Publication Date
EP1997100A1 EP1997100A1 (en) 2008-12-03
EP1997100B1 true EP1997100B1 (en) 2013-01-09

Family

ID=37982449

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07712104A Not-in-force EP1997100B1 (en) 2006-03-10 2007-01-25 Ultrasonic sensor

Country Status (7)

Country Link
US (1) US8080922B2 (en)
EP (1) EP1997100B1 (en)
CN (1) CN101401150B (en)
BR (1) BRPI0708581A2 (en)
DE (1) DE102006011155A1 (en)
ES (1) ES2399994T3 (en)
WO (1) WO2007104594A1 (en)

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Also Published As

Publication number Publication date
US8080922B2 (en) 2011-12-20
CN101401150A (en) 2009-04-01
DE102006011155A1 (en) 2007-09-13
ES2399994T3 (en) 2013-04-04
EP1997100A1 (en) 2008-12-03
BRPI0708581A2 (en) 2011-05-31
WO2007104594A1 (en) 2007-09-20
US20090301205A1 (en) 2009-12-10
CN101401150B (en) 2011-10-05

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