EP1037304A2 - Miniaturised antenna coil in particular for electronic vehicle closing systems - Google Patents

Miniaturised antenna coil in particular for electronic vehicle closing systems Download PDF

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Publication number
EP1037304A2
EP1037304A2 EP00102739A EP00102739A EP1037304A2 EP 1037304 A2 EP1037304 A2 EP 1037304A2 EP 00102739 A EP00102739 A EP 00102739A EP 00102739 A EP00102739 A EP 00102739A EP 1037304 A2 EP1037304 A2 EP 1037304A2
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EP
European Patent Office
Prior art keywords
antenna coil
plastic body
ferrite core
winding
core
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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
Application number
EP00102739A
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German (de)
French (fr)
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EP1037304B1 (en
EP1037304A3 (en
Inventor
Norbert Aue
Karl-J. Franke
Ralf Ullrich
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Kaschke KG & Co GmbH
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Kaschke KG & Co GmbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • H01Q7/08—Ferrite rod or like elongated core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
    • H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
    • H01Q1/3241—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems particular used in keyless entry systems

Definitions

  • the invention relates to a miniature antenna coil, in particular for wireless electronic vehicle locking systems.
  • Such an antenna coil is housed in the vehicle key together with the associated control electronics and must therefore be very small in the outer dimensions, whereby the trend towards further miniaturization continues.
  • the reliability properties must meet the high requirements of automotive engineering.
  • a rod core choke with a ferrite core has great miniaturization potential, at the ends of square caps, preferably made of metal, attached and are wound with the continuation of the winding on the ferrite core.
  • the winding the caps are tinned and at the same time form the SMD contact (DE 195 20 858 A1).
  • the tight transition between the winding with HF function is disadvantageous here and those with a contact function, which is why here because of a possible spreading of the tin solder beyond the caps with a strong one Variance of the electrical characteristic values must be expected.
  • the invention is therefore based on the object of an antenna coil with further To create miniaturization potential and at the same time high reliability, in which also the other disadvantages of the prior art mentioned be avoided.
  • the solution according to the invention is characterized by a high RF sensitivity and good directional characteristics. It is compact, very shock and impact resistant for direct soldering on both flexible and non-flexible circuit boards suitable.
  • the construction of the antenna coil is suitable for machine manufacturing.
  • the antenna coil according to the invention showed due to its overall construction an unexpected strength for the miniature ferrite part used.
  • Figures 1 and 2 show an actually executed antenna coil according to the invention in about 10x magnification, while the sectional views Figures 3 and 4 are enlarged about 20 times.
  • a plastic body 1 for example from an LCP Vectra E130 ", carries a ferrite core 2 made of manganese-zinc ferrite. As can be seen from FIG. 2, this plastic body 1 in the central region, which carries the winding 3 indicated in half in FIG. 1, is not wider than the ferrite core 2 remains hidden from it, which, in addition to the absence of a trough-shaped embedding known from the prior art, particularly contributes to saving space and thus to the possibility of miniaturization. At the ends of the ferrite core 2, the plastic body 1 is widened in the area 4 and encompasses it Ferrite core 2 laterally and forms a winding space 6 together with the metal strips 5, which extends up to the support on a printed circuit board 7.
  • the winding 3 shown only partially in FIG. 1 comprises, for example, 333 Turns of a 0.071 mm enamelled copper wire, which, for example, Test frequency of 125 kHz at 50 mV, an inductance of 1.056 mH and a Quality Q better than 30 over a temperature range of - 40 ° C to + 85 ° C.
  • the cross section of the ferrite core 2 is T-shaped (FIG. 3), the vertical leg 8 of the T ", for example by means of silicone adhesive, is glued into a corresponding pocket of the plastic body 1, which contributes quite considerably to the resistance mentioned in the drop test due to the simultaneous form and material connection.
  • the leg 8 has a slightly trapezoidal shape
  • the ferrite core 2 rests with the underside of its leg 8 on the plastic body 1, while its other surfaces facing the plastic body 1 have such dimensional tolerances that there may be a gap which then differs from the Silicone adhesive is filled.
  • the contacting of the antenna coil by means of the invention is essential of a metal strip 5, which widened around the in a Unifangsrille 9 ( Figure 4) End 4 of the plastic body 1 inserted and preferably by pressing is attached to a V-shaped recess 10 of this circumferential groove 9.
  • the wire ends 11 ( Figure 1) of the winding 3 are by thermal compression with the metal strip 5 connected.
  • the contacting of the antenna coil on the circuit board 7 is done by soft soldering. This contacting is also firm and reliable because the wire of the winding 3 runs only a minimal distance, where in the event of a load damaging accelerations could affect it.

Abstract

The coil consists of a prismatic ferrite core (2) disposed on a plastics body (1). The plastics body has metal contacts (5) at its ends for surface mounting of the coil. The plastics body is no wider than the longitudinal extent of the ferrite core and is wound with a coil wire together with the core. The ends of the plastics body which are wider than the core enclose the core up to the start of the winding.

Description

Die Erfindung betrifft eine Antennenspule in Miniaturausführung, insbesondere für drahtlose elektronische Fahrzeug-Schließsysteme. Eine solche Antennenspule ist zusammen mit der zugehörigen Ansteuerelektronik im Fahrzeugschlüssel untergebracht und muß demzufolge in den Außenabmessungen sehr klein sein, wobei die Tendenz zur weiteren Minaturisierung noch immer anhält. Dabei müssen bestimmte Hochfrequenzkennwerte, wie Empfindlichkeit und Richtcharakteristik eingehalten werden. Die Zuverlässigkeitseigenschaften müssen den hohen Anforderungen des Automobilbaues entsprechen.The invention relates to a miniature antenna coil, in particular for wireless electronic vehicle locking systems. Such an antenna coil is housed in the vehicle key together with the associated control electronics and must therefore be very small in the outer dimensions, whereby the trend towards further miniaturization continues. Certain High-frequency characteristics, such as sensitivity and directional characteristics, are observed become. The reliability properties must meet the high requirements of automotive engineering.

Es sind verschiedene Ausführungsformen solcher Miniaturspulen bekannt geworden, wobei die Probleme bei Luftspulen und bei solchen mit Magnetkern, wie im vorliegenden Falle, ähnlich sind und nachfolgend unabhängig von der tatsächlich ausgeführten Baugröße auch das technische Potential zur Miniaturisierung diskutiert wird.Various embodiments of such miniature coils have become known, the problems with air coils and those with a magnetic core, such as in present cases, are similar and are actually independent of the following size also discussed the technical potential for miniaturization becomes.

Es ist eine Chip-Induktivität, insbesondere eine HF-Drossel mit einem relativ großen Wickelraum bekannt, bei welchem die magnetische und die tragende Funktion von einem Ferritkern mit rechteckigem Querschnitt übernommen wird, welcher in der Nähe seiner Enden Verbreiterungen aufweist, an welchen aufgesteckte Metallteile anliegen, welche zugleich Auflage- und Kontaktelemente sind (DE 43 32 638). Hier läßt sich das für Drosseln erforderliche hohe Wickelvolumen ohne Platzvergeudung unterbringen. Der Miniaturisierung insgesamt sind aber durch die komplizierte Kernform und die problematische Form der Auflage- und Kontaktelemente mit ihren rechteckigen, genau auf den Kern passenden Durchbrüchen Grenzen gesetzt.It is a chip inductor, especially an RF choke with a relatively large one Changing room known, in which the magnetic and the load-bearing function is taken over by a ferrite core with a rectangular cross section, which has widenings near its ends, on which plugged Metal parts are in contact, which are both support and contact elements (DE 43 32 638). Here, the high winding volume required for chokes can be avoided Place wasted space. The miniaturization as a whole is through the complicated core shape and the problematic shape of the support and contact elements with their rectangular openings that fit exactly to the core Set limits.

Großes Minaturisierungspotential hat eine Stabkerndrossel mit einem Ferritkern, an dessen Enden vierkantige Kappen, vorzugsweise aus Metall, aufgesteckt und mit der Fortsetzung der Wicklung auf dem Ferritkern bewickelt sind. Die Wicklung auf den Kappen ist verzinnt und bildet zugleich die SMD-Kontaktierung (DE 195 20 858 A1). Nachteilig ist hier der enge Übergang zwischen der Wicklung mit HF-Funktion und derjenigen mit Kontaktfunktion, weshalb hier auch wegen einer möglichen Ausbreitung des Zinnlotes über die Kappen hinaus mit einer starken Exemplarstreuung der elektrischen Kennwerte gerechnet werden muß.A rod core choke with a ferrite core has great miniaturization potential, at the ends of square caps, preferably made of metal, attached and are wound with the continuation of the winding on the ferrite core. The winding the caps are tinned and at the same time form the SMD contact (DE 195 20 858 A1). The tight transition between the winding with HF function is disadvantageous here and those with a contact function, which is why here because of a possible spreading of the tin solder beyond the caps with a strong one Variance of the electrical characteristic values must be expected.

Bei einer bekannten Antennenspule liegt diese in einem trogartigen Kunststoffgehäuse, und die herausgeführten Wicklungsenden sind um T-förmige Kontaktierungsfortsätze gewickelt, welche sich parallel zur Montagefläche erstrecken, so daß der untere Drahtwickel um diese Fortsätze den SMD-Kontakt bildet (DE 195 47 091 A1).In a known antenna coil, this lies in a trough-like plastic housing, and the lead-out ends of the winding are around T-shaped contacting extensions wrapped, which extend parallel to the mounting surface, so that the lower wire winding forms the SMD contact around these extensions (DE 195 47 091 A1).

Bei einer gleichfalls trogförmigen Anordnung sind stirnseitig nach außen offene, U-förmige Blechstreifen eingesetzt, deren einer Schenkel in axialer Richtung über das Kunststoffteil hinausragt, mit den Wicklungsenden umwickelt ist und somit einen SMD-Kontakt bildet (DE 196 07 092 A1). Bei beiden technischen Lösungen ist der bewickelte Kern umfangsmäßig zu etwa drei Vierteln von dem trogfömigen Gehäuse umgeben, was einen guten Schutz und gute Festigkeitseigenschaften ergibt. Der Miniaturisierung sind hierbei ebenfalls Grenzen gesetzt, da die Wandung des

Figure 00020001
Troges" nicht beliebig dünn gemacht werden kann. Weiterhin benötigen die SMD-Kontakte im erstgenannten Fall viel Platz auf der Leiterplatte in seitlicher Richtung und im zweitgenannten Fall in axialer Richtung.In a likewise trough-shaped arrangement, U-shaped sheet metal strips are used on the end face, one leg of which protrudes axially beyond the plastic part, is wrapped with the winding ends and thus forms an SMD contact (DE 196 07 092 A1). In both technical solutions, around three quarters of the wound core is circumferentially surrounded by the trough-shaped housing, which gives good protection and good strength properties. The miniaturization is also limited, because the wall of the
Figure 00020001
Troges "cannot be made arbitrarily thin. Furthermore, the SMD contacts require a lot of space on the circuit board in the lateral direction in the former case and in the axial direction in the latter case.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Antennenspule mit weiterem Miniaturisierungspotential und zugleich hoher Zuverlässigkeit zu schaffen, bei welcher auch die weiteren erwähnten Nachteile des Standes der Technik vermieden werden.The invention is therefore based on the object of an antenna coil with further To create miniaturization potential and at the same time high reliability, in which also the other disadvantages of the prior art mentioned be avoided.

Diese Aufgabe wird durch die in den Patentansprüchen beschriebene Erfindung gelöst.This object is achieved by the invention described in the claims solved.

Die erfindungsgemäße Lösung zeichnet sich durch eine hohe HF-Empfindlichkeit und gute Richtcharakteristik aus. Sie ist kompakt, sehr stoß- und schlagfest und zur Direkteinlötung sowohl auf flexiblen als auch auf nicht flexiblen Leiterplatten geeignet. Die Konstruktion der Antennenspule ist zur Automatenfertigung geeignet.The solution according to the invention is characterized by a high RF sensitivity and good directional characteristics. It is compact, very shock and impact resistant for direct soldering on both flexible and non-flexible circuit boards suitable. The construction of the antenna coil is suitable for machine manufacturing.

Bei 5-m-Falltests zeigte die erfindungsgemäße Antennenspule infolge ihrer Gesamtkonstruktion eine für das verwendete Miniatur-Ferritteil unerwartete Festigkeit. In 5 m drop tests, the antenna coil according to the invention showed due to its overall construction an unexpected strength for the miniature ferrite part used.

Die Erfindung wird nachstehend an einem Ausführungsbeispiel näher erläutert Die beigefügten Zeichnungen stellen dar:

Fig. 1:
eine Seitenansicht einer teilweise bewickelten Antennenspule auf einer Leiterplatte;
Fig. 2:
eine Draufsicht auf eine nicht bewickelte Antennenspule;
Fig. 3:
einen Querschnitt etwa in der Mitte der nicht bewickelten Antennenspule und
Fig. 4:
einen Querschnitt durch den die Kontaktierung bildenden Metallstreifen.
The invention is explained in more detail below using an exemplary embodiment. The accompanying drawings illustrate:
Fig. 1:
a side view of a partially wound antenna coil on a circuit board;
Fig. 2:
a plan view of an unwound antenna coil;
Fig. 3:
a cross section approximately in the middle of the unwound antenna coil and
Fig. 4:
a cross section through the metal strip forming the contact.

Die Figuren 1 und 2 zeigen eine tatsächlich ausgeführte erfindungsgemäße Antennenspule in etwa 10facher Vergrößerung, während die Schnittdarstellungen der Figuren 3 und 4 etwa 20fach vergrößert sind.Figures 1 and 2 show an actually executed antenna coil according to the invention in about 10x magnification, while the sectional views Figures 3 and 4 are enlarged about 20 times.

Ein Kunststoffkörper 1, beispielsweise aus einem LCP Vectra E130", trägt einen Ferritkern 2 aus Mangan-Zink-Ferrit. Wie aus Fig. 2 zu erkennen ist, ist dieser Kunststoffkörper 1 im Mittelbereich, der die in Fig. 1 zur Hälfte angedeutete Wicklung 3 trägt, nicht breiter als der Ferritkern 2, bleibt also von diesem verdeckt, was neben dem Fehlen einer aus dem Stand der Technik bekannten trogförmigen Einbettung besonders zur Einsparung von Platz und damit zur Möglichkeit der Miniaturisierung beiträgt. An den Enden des Ferritkernes 2 ist der Kunststoffkörper 1 im Bereich 4 verbreitert und umfaßt den Ferritkern 2 seitlich und bildet zusammen mit den Metallstreifen 5 einen Wicklungsraum 6, der bis zur Auflage auf einer Leiterplatte 7 reicht.A plastic body 1, for example from an LCP Vectra E130 ", carries a ferrite core 2 made of manganese-zinc ferrite. As can be seen from FIG. 2, this plastic body 1 in the central region, which carries the winding 3 indicated in half in FIG. 1, is not wider than the ferrite core 2 remains hidden from it, which, in addition to the absence of a trough-shaped embedding known from the prior art, particularly contributes to saving space and thus to the possibility of miniaturization. At the ends of the ferrite core 2, the plastic body 1 is widened in the area 4 and encompasses it Ferrite core 2 laterally and forms a winding space 6 together with the metal strips 5, which extends up to the support on a printed circuit board 7.

Die in Figur 1 nur teilweise dargestellte Wicklung 3 umfaßt beispielsweise 333 Windungen eines 0,071 mm-Kupferlackdrahtes, womit sich beispielsweise bei einer Testfrequenz von 125 kHz bei 50 mV eine Induktivität von 1,056 mH und eine Güte Q besser als 30 über einen Temperaturbereich von - 40 °C bis + 85 °C ergibt.The winding 3 shown only partially in FIG. 1 comprises, for example, 333 Turns of a 0.071 mm enamelled copper wire, which, for example, Test frequency of 125 kHz at 50 mV, an inductance of 1.056 mH and a Quality Q better than 30 over a temperature range of - 40 ° C to + 85 ° C.

Bei einer speziellen Ausführungsform der erfindungsgemäßen Antennenspule ist der Querschnitt des Ferritkernes 2 T-förmig (Figur 3), wobei der senkrechte Schenkel 8 des T" beispielsweise mittels Silikonkleber, in eine entsprechende Tasche des Kunststoffkörpers 1 eingeklebt ist, was durch gleichzeitigen Form- und Stoffschluß ganz wesentlich zu der erwähnten Beständigkeit im Falltest beiträgt. Wie aus der Fig. 3 zu erkennen ist, hat der Schenkel 8 einen leicht trapezförmigen Querschnitt. Um eine sogenannte Überbestimmung zu vermeiden, liegt der Ferritkern 2 mit der Unterseite seines Schenkels 8 auf dem Kunststoffkörper 1 auf, während seine übrigen, dem Kunststoftkörper 1 zugewandten Flächen solche Maßtoleranzen haben, daß sich ggf. ein Spalt ergibt, der dann von dem Silikonkleber ausgefüllt wird.In a special embodiment of the antenna coil according to the invention, the cross section of the ferrite core 2 is T-shaped (FIG. 3), the vertical leg 8 of the T ", for example by means of silicone adhesive, is glued into a corresponding pocket of the plastic body 1, which contributes quite considerably to the resistance mentioned in the drop test due to the simultaneous form and material connection. As can be seen from FIG. 3, the leg 8 has a slightly trapezoidal shape In order to avoid a so-called overdetermination, the ferrite core 2 rests with the underside of its leg 8 on the plastic body 1, while its other surfaces facing the plastic body 1 have such dimensional tolerances that there may be a gap which then differs from the Silicone adhesive is filled.

Erfindungswesentlich ist schließlich die Kontaktierung der Antennenspule mittels eines Metallstreifens 5, der in eine Unifangsrille 9 (Figur 4) rund um das verbreiterte Ende 4 des Kunststoffkörpers 1 eingelegt und vorzugsweise durch Eindrücken in eine V-förmige Vertiefung 10 dieser Umfangsrille 9 befestigt ist. Die Drahtenden 11 (Figur 1) der Wicklung 3 sind durch Thermokompression mit dem Metallstreifen 5 verbunden. Die Kontaktierung der Antennenspule auf der Leiterplatte 7 erfolgt durch Weichlötung. Auch diese Kontaktierung ist fest und zuverlässig, da der Draht der Wicklung 3 nur eine minimale Strecke frei verläuft, wo im Belastungsfalle schädigende Beschleunigungen auf ihn einwirken könnten.Finally, the contacting of the antenna coil by means of the invention is essential of a metal strip 5, which widened around the in a Unifangsrille 9 (Figure 4) End 4 of the plastic body 1 inserted and preferably by pressing is attached to a V-shaped recess 10 of this circumferential groove 9. The wire ends 11 (Figure 1) of the winding 3 are by thermal compression with the metal strip 5 connected. The contacting of the antenna coil on the circuit board 7 is done by soft soldering. This contacting is also firm and reliable because the wire of the winding 3 runs only a minimal distance, where in the event of a load damaging accelerations could affect it.

Claims (4)

Antennenspule in Miniaturausführung, insbesondere für elektronische Fahrzeug-Schließsysteme, bestehend aus einem prismatischen, auf einen Kunststoffkörper (1) aufgeselzten Ferritkern (2), wobei der Kunststoffkörper (1) an seinen Enden Metallkontakte (5), vorzugsweise zur Oberflächenmontage (SMD) der Antennenspule, trägt, dadurch gekennzeichnet, daß der Kunststoffkörper (1) im Bereich der Längenausdehnung des Ferritkernes (2) nicht breiter ist als dieser und mit diesem zusammen mit dem Spulendraht (3) umwickelt ist.Miniature antenna coil, especially for electronic vehicle locking systems, consisting of a prismatic, on a plastic body (1) bristled ferrite core (2), the plastic body (1) on its Ends of metal contacts (5), preferably for surface mounting (SMD) Antenna coil, carries, characterized in that the plastic body (1) in Range of the linear expansion of the ferrite core (2) is not wider than this and wrapped with it together with the coil wire (3). Antennenspule nach Anspruch 1, dadurch gekennzeichnet, daß die gegenüber dem Ferritkern (2) verbreiterten Enden (4) des Kunststoffkörpers (1) jenen bis zum Wicklungsbeginn umfassen und in ihrer Höhe zusammen mit den Metallkontakten (5) den Wicklungsraum (6) für die spätere Montage der Antennenspule auf einer Leiterplatte (7) bestimmen.Antenna coil according to claim 1, characterized in that the opposite the ferrite core (2) widened ends (4) of the plastic body (1) to at the start of the winding and in height together with the metal contacts (5) the winding space (6) for the later assembly of the antenna coil determine a circuit board (7). Antennenspule nach einem der bisherigen Ansprüche, dadurch gekennzeichnet, daß die Metallkontakte aus jeweils einem Metallstreifen (5) bestehen, welcher in eine Umfangsrille (9) rund um das verbreiterte Ende (4) des Kunststoffkörpers (1) eingelegt ist, wobei die beiden Enden des Metallstreifens (5) V-förmig in eine Vertiefung (10) in der Umfangsrille (9) eingedrückt sind.Antenna coil according to one of the preceding claims, characterized in that the metal contacts each consist of a metal strip (5), which in a circumferential groove (9) around the widened end (4) of the plastic body (1) is inserted, the two ends of the metal strip (5) in a V-shape Indentation (10) are pressed into the circumferential groove (9). Antennenspule nach einem der bisherigen Ansprüche, dadurch gekennzeichnet, daß der Ferritkern (2) einen T-förmigen Querschnitt hat und der senkrechte Schenkel (8) des
Figure 00050001
T" in eine Tasche des Kunststoffkörpers (1) eingeklebt ist.Antenna coil according to one of the previous claims, characterized in that the ferrite core (2) has a T-shaped cross section and the vertical leg (8) of the
Figure 00050001
T "is glued into a pocket of the plastic body (1).
EP00102739A 1999-03-17 2000-02-10 Miniaturised antenna coil for electronic vehicle closing systems Expired - Lifetime EP1037304B1 (en)

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Application Number Priority Date Filing Date Title
DE19911803A DE19911803A1 (en) 1999-03-17 1999-03-17 Miniature antenna coil, especially for electronic vehicle locking systems
DE19911803 1999-03-17

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EP1037304A2 true EP1037304A2 (en) 2000-09-20
EP1037304A3 EP1037304A3 (en) 2001-11-07
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002095873A2 (en) * 2001-05-23 2002-11-28 Neosid Pemetzrieder Gmbh & Co. Kg Ferrite antenna
EP1496568A1 (en) * 2003-07-05 2005-01-12 Kaschke KG GmbH & Co. Transponder coil for wireless vehicle key entry systems
DE10143708B4 (en) * 2001-08-31 2005-04-07 Kaschke Kg (Gmbh & Co.) Miniature inductor with a prismatic ferrite core placed on a plastic body
WO2005052963A2 (en) * 2003-11-21 2005-06-09 Neosid Pemetzrieder Gmbh & Co. Kg Inductive miniature component for smd assembly
US6960912B2 (en) 2003-05-12 2005-11-01 Vacuumschmelze Gmbh & Co. Kg Magnetic field sensor device
EP1727163A1 (en) * 2004-02-18 2006-11-29 Sumida Corporation Coil, and antenna and transformer using the coil
EP1898494A2 (en) * 2006-09-08 2008-03-12 Vacuumschmelze GmbH & Co. KG Method for manufacturing a magnet assembly with a flat magnet core and such a magnet assembly
US7639109B2 (en) 2003-03-07 2009-12-29 Coilcraft, Incorporated Sensor coil and method of manufacturing same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19547091A1 (en) * 1995-12-16 1997-06-19 Kaschke Kg Gmbh & Co Aerial coil with surface mounted (SMD) casing e.g. for motor vehicle safety engineering
DE19607092A1 (en) * 1996-02-24 1997-08-28 Kaschke Kg Gmbh & Co Antenna coil for high reliability motor vehicle systems

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19547091A1 (en) * 1995-12-16 1997-06-19 Kaschke Kg Gmbh & Co Aerial coil with surface mounted (SMD) casing e.g. for motor vehicle safety engineering
DE19607092A1 (en) * 1996-02-24 1997-08-28 Kaschke Kg Gmbh & Co Antenna coil for high reliability motor vehicle systems

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002095873A2 (en) * 2001-05-23 2002-11-28 Neosid Pemetzrieder Gmbh & Co. Kg Ferrite antenna
WO2002095873A3 (en) * 2001-05-23 2003-02-06 Pemetzrieder Neosid Ferrite antenna
DE10143708B4 (en) * 2001-08-31 2005-04-07 Kaschke Kg (Gmbh & Co.) Miniature inductor with a prismatic ferrite core placed on a plastic body
US7639109B2 (en) 2003-03-07 2009-12-29 Coilcraft, Incorporated Sensor coil and method of manufacturing same
US6960912B2 (en) 2003-05-12 2005-11-01 Vacuumschmelze Gmbh & Co. Kg Magnetic field sensor device
EP1496568A1 (en) * 2003-07-05 2005-01-12 Kaschke KG GmbH & Co. Transponder coil for wireless vehicle key entry systems
WO2005052963A2 (en) * 2003-11-21 2005-06-09 Neosid Pemetzrieder Gmbh & Co. Kg Inductive miniature component for smd assembly
WO2005052963A3 (en) * 2003-11-21 2005-07-21 Pemetzrieder Neosid Inductive miniature component for smd assembly
EP1727163A1 (en) * 2004-02-18 2006-11-29 Sumida Corporation Coil, and antenna and transformer using the coil
EP1727163A4 (en) * 2004-02-18 2010-12-29 Sumida Corp Coil, and antenna and transformer using the coil
EP1898494A2 (en) * 2006-09-08 2008-03-12 Vacuumschmelze GmbH & Co. KG Method for manufacturing a magnet assembly with a flat magnet core and such a magnet assembly
EP1898494A3 (en) * 2006-09-08 2011-12-28 Vacuumschmelze GmbH & Co. KG Method for manufacturing a magnet assembly with a flat magnet core and such a magnet assembly

Also Published As

Publication number Publication date
DE50003327D1 (en) 2003-09-25
EP1037304B1 (en) 2003-08-20
ES2206093T3 (en) 2004-05-16
EP1037304A3 (en) 2001-11-07
DE19911803A1 (en) 2000-09-21

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