EP0971557A2 - Ultraschall-Folien-Wandler - Google Patents
Ultraschall-Folien-Wandler Download PDFInfo
- Publication number
- EP0971557A2 EP0971557A2 EP99109344A EP99109344A EP0971557A2 EP 0971557 A2 EP0971557 A2 EP 0971557A2 EP 99109344 A EP99109344 A EP 99109344A EP 99109344 A EP99109344 A EP 99109344A EP 0971557 A2 EP0971557 A2 EP 0971557A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- film
- ultrasonic
- electrically conductive
- transducer according
- plastic
- 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.)
- Granted
Links
- 239000011888 foil Substances 0.000 title claims description 6
- 239000004033 plastic Substances 0.000 claims abstract description 7
- 229920003023 plastic Polymers 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 239000002985 plastic film Substances 0.000 claims description 18
- 229920006255 plastic film Polymers 0.000 claims description 18
- 239000012528 membrane Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims description 2
- 239000012212 insulator Substances 0.000 claims 1
- 238000010030 laminating Methods 0.000 claims 1
- 239000004071 soot Substances 0.000 claims 1
- 239000002184 metal Substances 0.000 description 13
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 3
- 238000002604 ultrasonography Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0688—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction with foil-type piezoelectric elements, e.g. PVDF
Definitions
- the invention relates to an ultrasonic film transducer comprising two electrodes and an insulating layer arranged between the electrodes.
- An electrostatic ultrasonic transducer is constructed similarly to a plate capacitor, in which a thin conductive membrane is arranged opposite a solid electrode is, the membrane also acts as a counter electrode.
- the membrane By creating one AC voltage between the electrodes leads to a force that the flexible membrane stimulates vibration, causing sound waves in the surrounding air be generated.
- the electrostatic force on the membrane is proportional to the square of the applied voltage increases, the operating point on the quadratic characteristic shifted by applying a high DC voltage so that the changes are almost linear due to the AC voltage.
- the membrane is applied directly to the electrode via an insulating intermediate layer applied, an ultrasonic sell transducer is created, with two variants in principle exist to create the air cushion necessary for sound generation.
- an ultrasonic sell transducer is created, with two variants in principle exist to create the air cushion necessary for sound generation.
- the surface quality of the electrode is decisive for the cutoff frequency and the Sensitivity of the ultrasonic transducer responsible. If the surface is polished, a Frequency range up to approx. 500 kHz reached with relatively low sensitivity.
- the surface of the electrode is roughened or structured, for example, with grooves, the cutoff frequency decreases with increased sensitivity.
- Insulating layer for example, be structured with openings so that there is between the Membrane and the electrode forms an air cushion.
- Such an ultrasonic sell converter is known for example from DE 196 33 566, um to sense the distance from objects.
- Ultrasonic transducers such as are required in the automotive field, for example proposed a film structure, which is shown in Fig. 1.
- the metal foils of the Electrodes can also lead to hairline cracks, which in the long term lead to Cause total failure of the converter.
- the invention is therefore based on the technical problem of such an ultrasound transducer and to create a process for its manufacture in which the previously problems described are avoided.
- the ultrasonic film converter 1 comprises a first metal layer 2, an insulating layer 3 and a second metal layer 4.
- the metal layer 4 is structured such that Form electrodes 5 and conductor tracks (not shown) to electrodes 5.
- the Insulating layer 3, which is designed as a film, serves for the electrical separation of the two metal layers 2, 4 and has an opening 6 in the area of the electrode 5, so that an air cushion can form between the two metal layers 2, 4.
- the first metal layer 2, which is formed unstructured, can either with the Insulating layer 3 form a common film or on a separate film 7 be applied.
- the ultrasonic film transducer 1 is in the range of Automotive technology in vehicle parts 8, such as trim strips or bumpers, integrated, the ultrasonic film transducer 11 preferably in the Vehicle part 8 is injected.
- metal layers 2, 4 Because of the pressures that occur during the injection process hairline cracks can occur in the metal layers 2, 4, which then develop in the course of Expand operation and to a complete tearing of the metal layers 2, 4 being able to lead. Furthermore, the metal layers 2, 4 have despite their small thickness of 100 ⁇ m a certain rigidity compared to the other films, so that it too Warping can occur because the metal layers 2, 4 are not sufficient Can adjust contours in the injection mold.
- the metal layers 2, 4 are made of conductive Plastic films 9, 10 replaced what is shown in cross-section in FIG. 2.
- the basic layer sequence corresponds to that of FIG. 1.
- the electrodes As a conductive plastic film 9, 10, however, there are some changes. So are Conductive plastic films in relation to metal layers more flexible, so that these when Better adapt the injection process to the contours and also due to the pressures are less easily damaged.
- the manufacturing process Simplify, since for example the plastic film 9 and the insulating film 3 are simple have it laminated and available as rolls.
- the plastic film 10 has in Cross section of a mushroom-shaped structure, with the wider top being the actual one Electrode surface forms and the narrower underside for alignment in the injection mold and is used for contacting.
- This shape allows sufficient back injection of the Ultrasonic film transducer 1 with molding compound of part 8. Because the one electrode plastic film 9 is already formed as a film, can on the separate film 6th 1 are omitted. To protect against mechanical damage and Color matching to the environment can alternatively a paint layer 11 on the Plastic film 9 are applied.
- FIG. 3 shows a top view of the ultrasound film transducer 1, the Plastic film 10 with the electrode 5 formed by it to the openings 6 of the Insulating film 3 is aligned and completely covered.
- the breakthroughs 6 are there preferably designed as concentrically arranged slots, as in FIG. 4 is shown.
- a base material for the plastic films 9, 10 are conductive Insulating plastics filled with particles, with carbon, especially carbon black, good results have been achieved.
- a PVC is preferably used as the plastic used that is easy to process and flexible according to different contours adapts what Rexam 2252 COERX is used for.
- the slides point preferably a thickness between 50 to 100 microns.
- the ultrasonic film transducer 1 can be produced particularly easily if the Structures for forming the air cushion are integrated into the plastic film 10 because then the insulating film 3 as the plastic film 9 can be formed unstructured. Thereby the two foils 3, 9 can be aligned in relation to one another Laminate uncritical pre-process together and are available as rolls, to which the plastic film 10 is then also applied without critical adjustment got to.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Laminated Bodies (AREA)
Abstract
Description
- Fig. 1
- einen Querschnitt durch einen Ultraschall-Folien-Wandler (Stand der Technik),
- Fig. 2
- einen Querschnitt durch einen Ultraschall-Folien-Wandler,
- Fig. 3
- eine Draufsicht auf einen Ultraschall-Folienwandler und
- Fig. 4
- eine Draufsicht auf eine Isolierfolie.
Claims (10)
- Ultraschall-Folien-Wandler, umfassend zwei elektrisch leitende Folien, zwischen denen eine Isolierschicht angeordnet ist,
dadurch gekennzeichnet, daß
die elektrisch leitenden Folien (9, 10) aus leitfähigem Kunststoff gebildet sind. - Ultraschall-Folien-Wandler nach Anspruch 1, dadurch gekennzeichnet, daß der Kunststoff als mit leitfähigen Partikeln gefüllter Isolator ausgebildet ist.
- Ultraschall-Folien-Wandler nach Anspruch 2, dadurch gekennzeichnet, daß die Partikel aus Kohlenstoff gebildet sind.
- Ultraschall-Folien-Wandler nach Anspruch 3, dadurch gekennzeichnet, daß die Partikel Rußteilchen sind.
- Ultraschall-Folien-Wandler nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß der Kunststoff aus einem PVC gebildet ist.
- Ultraschall-Folien-Wandler nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß die eine elektrisch leitende Kunststoffolie (9) als unstrukturierte, die schwingungsfähige Membrane bildende Folie ausgebildet ist.
- Ultraschall-Folien-Wandler nach Anspruch 6, dadurch gekennzeichnet, daß die zweite elektrisch leitende Kunststoffolie (10) derart strukturiert ist, daß sich singuläre Elektroden (5) und Leiterbahnen ausbilden, wobei die Kunststoffolie (10) im Bereich der Elektroden (5) im Querschnitt pilzförmig ausgebildet ist.
- Ultraschall-Folien-Wandler nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Isolierschicht (3) mit konzentrischen Teileinschnitten ausgebildet ist.
- Ultraschall-Folien-Wandler nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Isolierschicht (3) als unstrukturierte Folie und die Kunststoffolie (10) im Bereich der Elektroden (5) mit Luftpolstern bildenden Strukturen ausgebildet sind.
- Verfahren zur Herstellung eines Ultraschall-Folien-Wandlers (1) nach Anspruch 9, umfassend folgende Verfahrensschritte:a) Laminieren der ersten elektrisch leitenden Kunststoffolie (9) mit der Isolierfolie (3)
undb) Aufbringen der zweiten elektrisch leitenden Kunststoffolie (10) auf die gemäß Verfahrensschritt a) erzeugte laminierte Folie.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19825581A DE19825581A1 (de) | 1998-06-09 | 1998-06-09 | Ultraschall-Folien-Wandler |
DE19825581 | 1998-06-09 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0971557A2 true EP0971557A2 (de) | 2000-01-12 |
EP0971557A3 EP0971557A3 (de) | 2000-02-09 |
EP0971557B1 EP0971557B1 (de) | 2003-08-13 |
Family
ID=7870302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99109344A Expired - Lifetime EP0971557B1 (de) | 1998-06-09 | 1999-05-31 | Ultraschall-Folien-Wandler |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0971557B1 (de) |
DE (2) | DE19825581A1 (de) |
ES (1) | ES2205631T3 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6882260B2 (en) | 2000-05-22 | 2005-04-19 | Payton Ltd. | Method and apparatus for insulating a planar transformer printed circuit and lead frame windings forms |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3309234A1 (de) * | 1983-03-15 | 1984-09-20 | Siemens AG, 1000 Berlin und 8000 München | Ultraschallwandler |
DE3309218A1 (de) * | 1983-03-15 | 1984-09-20 | Siemens AG, 1000 Berlin und 8000 München | Lineares ultraschall-array |
US5550790A (en) * | 1995-02-10 | 1996-08-27 | Kistler-Morse Corporation | Acoustic transducer for level measurement in corrosive chemical environments |
EP0825585A2 (de) * | 1996-08-21 | 1998-02-25 | Volkswagen Aktiengesellschaft | Vorrichtung zur Bestimmung des Abstandes von Objekten |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3103357C2 (de) * | 1981-01-31 | 1982-10-21 | Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5000 Köln | Ultraschallwandler |
DE3149732A1 (de) * | 1981-12-15 | 1983-07-21 | Siemens AG, 1000 Berlin und 8000 München | Ultraschallwandleranordnung |
US5642015A (en) * | 1993-07-14 | 1997-06-24 | The University Of British Columbia | Elastomeric micro electro mechanical systems |
US5442595A (en) * | 1994-04-22 | 1995-08-15 | Xecutek Corporation | Capacitance-type ultrasonic transducer |
-
1998
- 1998-06-09 DE DE19825581A patent/DE19825581A1/de not_active Withdrawn
-
1999
- 1999-05-31 ES ES99109344T patent/ES2205631T3/es not_active Expired - Lifetime
- 1999-05-31 EP EP99109344A patent/EP0971557B1/de not_active Expired - Lifetime
- 1999-05-31 DE DE59906567T patent/DE59906567D1/de not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3309234A1 (de) * | 1983-03-15 | 1984-09-20 | Siemens AG, 1000 Berlin und 8000 München | Ultraschallwandler |
DE3309218A1 (de) * | 1983-03-15 | 1984-09-20 | Siemens AG, 1000 Berlin und 8000 München | Lineares ultraschall-array |
US5550790A (en) * | 1995-02-10 | 1996-08-27 | Kistler-Morse Corporation | Acoustic transducer for level measurement in corrosive chemical environments |
EP0825585A2 (de) * | 1996-08-21 | 1998-02-25 | Volkswagen Aktiengesellschaft | Vorrichtung zur Bestimmung des Abstandes von Objekten |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6882260B2 (en) | 2000-05-22 | 2005-04-19 | Payton Ltd. | Method and apparatus for insulating a planar transformer printed circuit and lead frame windings forms |
Also Published As
Publication number | Publication date |
---|---|
ES2205631T3 (es) | 2004-05-01 |
EP0971557A3 (de) | 2000-02-09 |
EP0971557B1 (de) | 2003-08-13 |
DE19825581A1 (de) | 1999-12-16 |
DE59906567D1 (de) | 2003-09-18 |
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