EP1776260A1 - Transmitting antenna arrangement for emitting a longwave wake-up signal for an id transmitter in a keyless motor vehicle access system - Google Patents

Transmitting antenna arrangement for emitting a longwave wake-up signal for an id transmitter in a keyless motor vehicle access system

Info

Publication number
EP1776260A1
EP1776260A1 EP05740735A EP05740735A EP1776260A1 EP 1776260 A1 EP1776260 A1 EP 1776260A1 EP 05740735 A EP05740735 A EP 05740735A EP 05740735 A EP05740735 A EP 05740735A EP 1776260 A1 EP1776260 A1 EP 1776260A1
Authority
EP
European Patent Office
Prior art keywords
antenna arrangement
transmitting antenna
motor vehicle
layers
core
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.)
Withdrawn
Application number
EP05740735A
Other languages
German (de)
French (fr)
Inventor
Mirko Schindler
Andreas Van Den Boom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huf Huelsbeck and Fuerst GmbH and Co KG
Original Assignee
Huf Huelsbeck and Fuerst GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Huf Huelsbeck and Fuerst GmbH and Co KG filed Critical Huf Huelsbeck and Fuerst GmbH and Co KG
Publication of EP1776260A1 publication Critical patent/EP1776260A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures

Definitions

  • Transmitting antenna arrangement for emitting a long-wave Auf ⁇ wake-up signal for an ID transmitter of a keyless motor vehicle access system
  • the invention relates to a transmitting antenna arrangement for emitting a long-wave wake-up signal for an ID transmitter of a keyless vehicle access system having an induction coil arranged in the interior of a motor vehicle component with at least one winding and a core surrounded by the winding.
  • Such a transmitting antenna arrangement is known, for example, from the published patent application DE 102 36 957 A1.
  • the document describes a vehicle door handle with an electronic module integrated therein, which comprises a microcontroller connected to an antenna via an antenna driver.
  • the antenna has a ferrite core, which is surrounded by a Spulen ⁇ winding.
  • Disadvantages of the use of ferrite cores are the inaccuracies or large scattering widths of the inductances produced due to shrinkage of the ferrites during sintering, which necessitate a subsequent equalization of the antenna inductances produced in this way.
  • One solution is, for example, to design the antenna arrangement with two spaced-apart ferrite core rods, the trimming of the inductance being carried out by changing the inductance
  • the object of the invention is to provide inexpensive transmission antenna arrangements with reduced manufacturing tolerances. This object is achieved by a transmitting antenna nenan angel with the features of claim 1.
  • the core is in the form of a flat strip and consists of a plurality of superimposed layers extending over the entire length of the strip, the layers being metal strips.
  • BESTATIGUNGSKOPIE layers of a nanocrystalline or amorphous, weichma ⁇ netic metal alloy of high permeability comprise, wherein each of the metal layers has a thickness between 15 and 100 .mu.m, preferably between 20 and 30 .mu.m, and wherein the metal layers are arranged one above the other so that a current flow of a Metal layer to an adjacent er ⁇ sword is.
  • the use of said material leads to a core with the desired soft magnetic properties.
  • the inductances of the coils produced on the basis of such cores can already be set more precisely during production by a multiple than the inductances of ferrite core coils, since the magnetic properties and dimensions the cores are more reproducible.
  • the several thin metal layers can be spaced apart by insulator layers or else lie directly on top of one another, wherein in the latter case the current flow between the layers can be made difficult by a special surface structure of the layers.
  • the cores produced from the thin metal alloy layers have a significantly higher mechanical flexibility compared to ferrite cores (inter alia bendability), which facilitates their mounting in a motor vehicle component, in particular in a door handle.
  • the cores additionally have (thicker) insulator layers.
  • the few thin metal alloy layers also make it possible to produce a core and thus an antenna arrangement with a relatively low weight.
  • the thin metal alloy layer used is preferably an amorphous cobalt alloy, alternatively an iron-based nanocrystalline alloy.
  • Another advantage of using such layers for constructing cores for induction coils of antenna arrangements is that the thin metal layers and the cores made therefrom are cheaper to produce than cores made of ferrites.
  • 5 to 20, preferably 6 to 10 metal layers are arranged one above the other. This number leads to an optimum of the desired magnetic properties and the weight.
  • FIG. 1 shows a schematic plan view of a door handle with the transmitting antenna arrangement according to the invention
  • FIG. 2 shows a schematic sectional view of the core used in the transmitting antenna arrangement.
  • the antenna arrangement according to the invention for emitting a long-wave wake-up signal for an ID transmitter of a keyless vehicle access system is typically arranged inside a motor vehicle door handle.
  • 1 shows a schematic plan view of an outwardly directed side surface of a door handle 1.
  • the antenna arrangement 2 comprises a core 3 with a coil winding 4 arranged thereon.
  • the supply lines 5 of the coil 4 are connected to an antenna driver circuit 6.
  • the antenna arrangement transmits at a carrier frequency between 100 and 200 kHz, preferably about 125 kHz.
  • the core 3 has an 'elongated flat shape.
  • FIG. 2 shows a sectional view on a cutting plane transverse to the longitudinal direction of the core.
  • FIG. Fig. 2 is a schematic illustration, ie the ratio of the thickness to the width of the core and the layer thickness ratios do not necessarily correspond to the actual embodiment.
  • the core consists of several superimposed layers extending over the entire length of the strip. These layers comprise metal layers 7.
  • the metal layers consist of a nanocrystalline or amorphous soft magnetic metal alloy of high permeability and in each case have a thickness between 15 and 100 .mu.m, preferably between 20 and 30 .mu.m.
  • metal layers 7 are arranged one above the other, which are covered at the top and bottom by an insulator layer 8, respectively.
  • layers of a nanocrystalline cobalt alloy are used which have a thickness of about 20 to 25 ⁇ m.
  • the metal foils of the "VITROVAC” brand from Vacuumschmelze GmbH can be used.
  • the stacked metal layers are electrically isolated from each other so that the flow of current between the layers is difficult. This can be achieved, for example, by means of an insulating layer arranged between the layers.
  • the use of only a few layers leads on the one hand to a relatively flexible, ie bendable core, on the other hand to a further reduction in weight compared to conventional ferrite cores.
  • the reduced weight of the induction coil leads to a double weight reduction when this induction coil, such as is provided according to the invention, is introduced in a motor vehicle door handle, because in this case, the inside of the door located balancing mass can also be reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Lock And Its Accessories (AREA)
  • Details Of Aerials (AREA)

Abstract

A transmitting antenna arrangement for emitting a longwave wake-up signal for an ID transmitter in a keyless motor vehicle system. An induction coil (2) comprising at least one winding and a core (3) surrounded by said winding is arranged inside a component (1) of the motor vehicle. The core (3) is shaped as a flat strip and consists of several layers placed on top of each other, containing a nano-crystalline or amorphous soft-magnetic metal alloy having a high permeability. The thickness of each metal layer is between 15 µm and 100 µm and the layers are placed on top of each other in such a way that the flow of current from one metal layer to another adjacent layer is made more difficult.

Description

Sendeantennenanordnung zum Abstrahlen eines langwelligen Auf¬ wecksignals für einen ID-Geber eines schlüssellosen Kraftfahr¬ zeugzugangssystems Transmitting antenna arrangement for emitting a long-wave Auf¬ wake-up signal for an ID transmitter of a keyless motor vehicle access system
Die Erfindung betrifft eine Sendeantennenanordnung zum Ab¬ strahlen eines langwelligen Aufwecksignals für einen ID-Geber eines schlüssellosen Kraftfahrzeugzugangssystems mit einer im Inneren eines Kraftfahrzeugbauteils angeordneten Induktions- spule mit wenigstens einer Wicklung und einem von der Wicklung umgebenen Kern.The invention relates to a transmitting antenna arrangement for emitting a long-wave wake-up signal for an ID transmitter of a keyless vehicle access system having an induction coil arranged in the interior of a motor vehicle component with at least one winding and a core surrounded by the winding.
Eine derartige Sendeantennenanordnung ist beispielsweise aus der Offenlegungsschrift DE 102 36 957 Al bekannt. Die Druckschrift beschreibt einen Fahrzeugtürgriff mit einem darin integrierten Elektronikmodul, das einen über einen Antennen¬ treiber mit einer Antenne verbundenen MikroController umfaßt. Die Antenne weist einen Ferritkern auf, der von einer Spulen¬ wicklung umgeben ist. Nachteilig bei der Verwendung von Fer¬ ritkernen sind die auf einem Schwinden der Ferrite beim Sin- tern zurückzuführenden Ungenauigkeiten bzw. großen Streubrei¬ ten der erzeugten Induktivitäten, die einen nachträglichen Ab¬ gleich der so hergestellten Antenneninduktivitäten erforder¬ lich machen. Eine Lösung besteht beispielsweise darin, die An¬ tennenanordnung mit zwei beabstandeten Ferritkernstäben auszu- führen, wobei das Trimmen der Induktivität durch Verändern desSuch a transmitting antenna arrangement is known, for example, from the published patent application DE 102 36 957 A1. The document describes a vehicle door handle with an electronic module integrated therein, which comprises a microcontroller connected to an antenna via an antenna driver. The antenna has a ferrite core, which is surrounded by a Spulen¬ winding. Disadvantages of the use of ferrite cores are the inaccuracies or large scattering widths of the inductances produced due to shrinkage of the ferrites during sintering, which necessitate a subsequent equalization of the antenna inductances produced in this way. One solution is, for example, to design the antenna arrangement with two spaced-apart ferrite core rods, the trimming of the inductance being carried out by changing the inductance
Abstands der Stirnseiten der beiden hintereinander angeordne¬ ten Ferritkernstäbe vorgenommen werden kann.Distance between the end faces of the two successive angeordne¬ th ferrite core rods can be made.
Aufgabe der Erfindung ist es, preiswerte Sendeantennenan¬ ordnungen mit verringerten Herstellungstoleranzen zu schaffen. Diese Aufgabe wird erfindungsgemäß durch eine Sendeanten¬ nenanordnung mit den Merkmalen des Anspruchs 1 gelöst.The object of the invention is to provide inexpensive transmission antenna arrangements with reduced manufacturing tolerances. This object is achieved by a transmitting antenna nenanordnung with the features of claim 1.
Bei der erfindungsgemäßen Sendeantennenanordnung hat der Kern die Form eines flachen Streifens und besteht aus mehreren übereinander liegenden, sich über die gesamte Länge des Strei- fens erstreckenden Schichten, wobei die Schichten Metall-In the transmitting antenna arrangement according to the invention, the core is in the form of a flat strip and consists of a plurality of superimposed layers extending over the entire length of the strip, the layers being metal strips.
BESTATIGUNGSKOPIE schichten aus einer nanόkristallinen oder amorphen, weichma¬ gnetischen Metallegierung hoher Permeabilität umfassen, wobei jede der Metallschichten eine Dicke zwischen 15 und 100 μm, vorzugsweise zwischen 20 und 30 μm, aufweist, und wobei die Metallschichten derart übereinander angeordnet sind, daß ein Stromfluß von einer Metallschicht zu einer benachbarten er¬ schwert ist . Die Verwendung des genannten Materials führt zu einem Kern mit den gewünschten weichmagnetischen Eigenschaf¬ ten. Die Induktivitäten der auf der Grundlage solcher Kerne hergestellten Spulen lassen sich bereits bei der Herstellung um ein Vielfaches genauer einstellen als die Induktivitäten von Ferritkernspulen, da die magnetischen Eigenschaften und Dimensionen der Kerne genauer reproduzierbar sind. Die mehre¬ ren dünnen Metallschichten können durch Isolatorschichten beabstandet sein oder auch direkt aufeinander liegen, wobei in dem zuletzt genannten Fall der Stromfluß zwischen den Schich¬ ten durch eine spezielle Oberflächenstruktur der Schichten er¬ schwert sein kann.BESTATIGUNGSKOPIE layers of a nanocrystalline or amorphous, weichma¬ netic metal alloy of high permeability comprise, wherein each of the metal layers has a thickness between 15 and 100 .mu.m, preferably between 20 and 30 .mu.m, and wherein the metal layers are arranged one above the other so that a current flow of a Metal layer to an adjacent er¬ sword is. The use of said material leads to a core with the desired soft magnetic properties. The inductances of the coils produced on the basis of such cores can already be set more precisely during production by a multiple than the inductances of ferrite core coils, since the magnetic properties and dimensions the cores are more reproducible. The several thin metal layers can be spaced apart by insulator layers or else lie directly on top of one another, wherein in the latter case the current flow between the layers can be made difficult by a special surface structure of the layers.
Die aus den dünnen Metallegierungsschichten hergestellten Kerne haben gegenüber Ferritkernen eine deutlich höhere mecha¬ nische Flexibilität (u.a. Biegbarkeit) , was ihre Montage in einem Kraftfahrzeugbauteil insbesondere in einem Türgriff, er¬ leichtert. Die Kerne weisen neben den wenigen Metallegierungs¬ schichten an den Außenflächen zusätzlich (dickere) Isolator- schichten auf. Die wenigen dünnen Metallegierungsschichten er¬ möglichen zudem die Herstellung eines Kerns und somit einer Antennenanordnung mit einem relativ geringen Gewicht.The cores produced from the thin metal alloy layers have a significantly higher mechanical flexibility compared to ferrite cores (inter alia bendability), which facilitates their mounting in a motor vehicle component, in particular in a door handle. In addition to the few metal alloy layers on the outer surfaces, the cores additionally have (thicker) insulator layers. The few thin metal alloy layers also make it possible to produce a core and thus an antenna arrangement with a relatively low weight.
Als dünne Metallegierungsschicht wird vorzugsweise eine amorphe Kobaltlegierung, alternativ eine nanokristalline Le- gierung auf Eisenbasis verwendet. Ein weiterer Vorteil bei der Verwendung derartiger Schichten zum Aufbau von Kernen für In¬ duktionsspulen von Antennenanordnungen besteht darin, daß die dünnen Metallschichten und die daraus hergestellten Kerne preiswerter als Kerne aus Ferriten herzustellen sind. Bei einer bevorzugten Ausführungsform sind 5 bis 20, vor¬ zugsweise 6 - 10, Metallschichten übereinander angeordnet. Diese Anzahl führt zu einem Optimum der gewünschten magneti¬ schen Eigenschaften und des Gewichts.The thin metal alloy layer used is preferably an amorphous cobalt alloy, alternatively an iron-based nanocrystalline alloy. Another advantage of using such layers for constructing cores for induction coils of antenna arrangements is that the thin metal layers and the cores made therefrom are cheaper to produce than cores made of ferrites. In a preferred embodiment, 5 to 20, preferably 6 to 10, metal layers are arranged one above the other. This number leads to an optimum of the desired magnetic properties and the weight.
Vorteilhafte und/oder bevorzugte Weiterbildungen der Er¬ findung sind in den Unteransprüchen gekennzeichnet. Im folgenden wird die Erfindung anhand eines in der Zeich¬ nung dargestellten bevorzugten Ausführungsbeispiels näher be¬ schrieben. In der Zeichnung zeigen:Advantageous and / or preferred developments of the invention are characterized in the subclaims. In the following the invention will be described in greater detail with reference to a preferred exemplary embodiment shown in the drawing. In the drawing show:
Fig. 1: eine schematische Draufsicht auf ein Türgriff mit der erfindungsgemäßen Sendeantennenanordnung, und Fig. 2: eine schematische Schnittansicht des in der Sende¬ antennenanordnung verwendeten Kerns.1 shows a schematic plan view of a door handle with the transmitting antenna arrangement according to the invention, and FIG. 2 shows a schematic sectional view of the core used in the transmitting antenna arrangement.
Die erfindungsgemäße Antennenanordnung zum Abstrahlen ei¬ nes langwelligen Aufwecksignal für einen ID-Geber eines schlüssellosen Kraftfahrzeugzugangssystems ist typischerweise im Inneren eines Kraftfahrzeugtürgriffs angeordnet. Fig. 1 zeigt eine schematische Draufsicht auf eine nach außen gerich¬ tete Seitenfläche eines Türgriffs 1. Im Inneren des Türgriffs sind eine Reihe elektronischer Komponenten angeordnet, die üb¬ licherweise einen Sensor zur Erfassung des Zugreifens auf den Türgriff, elektronische Steuereinrichtungen sowie eine Anten¬ nenanordnung 2 mit zugehöriger Treiberschaltung umfassen. Die Antennenanordnung 2 umfaßt einen Kern 3 mit einer darauf ange¬ ordneten Spulenwicklung 4. Die Zuleitungen 5 der Spule 4 sind mit einer Antennentreiberschaltung 6 verbunden. Diese Elemente sind in Fig. 1 schematisch, d.h. nicht maßstabsgetreu darge¬ stellt. Bei der in Fig. 1 gezeigten bevorzugten Induktions¬ spule 2 erstreckt sich die Wicklung 4 beinahe über die gesamte Länge des Kerns 3. Bei anderen Ausführungsformen könnte auch nur ein Teilabschnitt des Kerns mit einer Spule bewickelt sein. Die Anzahl der Wicklungen und der verwendete DrahtThe antenna arrangement according to the invention for emitting a long-wave wake-up signal for an ID transmitter of a keyless vehicle access system is typically arranged inside a motor vehicle door handle. 1 shows a schematic plan view of an outwardly directed side surface of a door handle 1. Inside the door handle a number of electronic components are arranged, which usually comprise a sensor for detecting the access to the door handle, electronic control devices and an antenna nenanordnung 2 with associated driver circuit include. The antenna arrangement 2 comprises a core 3 with a coil winding 4 arranged thereon. The supply lines 5 of the coil 4 are connected to an antenna driver circuit 6. These elements are shown schematically in Fig. 1, i. not to scale. In the preferred induction coil 2 shown in FIG. 1, the winding 4 extends almost over the entire length of the core 3. In other embodiments, only a portion of the core could be wound with a coil. The number of windings and the wire used
(Durchmesser und Material) bestimmen sich nach den gewünschten elektromagnetischen Eigenschaften, insbesondere der gewünsch¬ ten Senderträgerfrequenz und der Reichweite. Diese Details sind für die Zwecke der Beschreibung der vorliegenden Erfin- düng jedoch von untergeordneter Bedeutung. Vorzugsweise sendet die Antennenanordnung auf einer Trägerfrequenz zwischen 100 und 200 kHz, vorzugsweise etwa 125 kHz. Der Kern 3 hat eine' langgestreckte flache Form. Fig. 2 zeigt eine Schnittansicht an einer quer zur Längsrichtung des Kerns liegenden Schnittebene. Fig. 2 ist eine schematische Darstellung, d.h. das Verhältnis der Dicke zur Breite des Kerns und die Schichtdickenverhältnisse entsprechen nicht zwangsläufig der tatsächlichen Ausführungsform.(Diameter and material) are determined by the desired electromagnetic properties, in particular the desired transmitter carrier frequency and the range. However, these details are of minor importance for the purposes of describing the present invention. Preferably, the antenna arrangement transmits at a carrier frequency between 100 and 200 kHz, preferably about 125 kHz. The core 3 has an 'elongated flat shape. FIG. 2 shows a sectional view on a cutting plane transverse to the longitudinal direction of the core. FIG. Fig. 2 is a schematic illustration, ie the ratio of the thickness to the width of the core and the layer thickness ratios do not necessarily correspond to the actual embodiment.
Der Kern besteht aus mehreren übereinander liegenden, sich über die gesamte Länge des Streifens erstreckenden Schichten. Diese Schichten umfassen Metallschichten 7. Die Metallschich- ten bestehen aus einer nanokristallinen oder amorphen weichma¬ gnetischen Metallegierung hoher Permeabilität und haben je¬ weils eine Dicke zwischen 15 und 100 μm, vorzugsweise zwischen 20 und 30 μm.The core consists of several superimposed layers extending over the entire length of the strip. These layers comprise metal layers 7. The metal layers consist of a nanocrystalline or amorphous soft magnetic metal alloy of high permeability and in each case have a thickness between 15 and 100 .mu.m, preferably between 20 and 30 .mu.m.
In der Mitte des Kerns sind 5 bis 20, vorzugsweise 6 - 10 Metallschichten 7 übereinander angeordnet, die oben und unten jeweils von einer Isolatorschicht 8 bedeckt sind. Bei der be¬ vorzugten Ausführungsform werden Schichten einer nanokristal¬ linen Kobaltlegierung verwendet, die eine Dicke von etwa 20 bis 25 μm haben. Beispielsweise können die Metallfolien der Marke "VITROVAC" der Firma Vacuumschmelze GmbH verwendet wer¬ den.In the middle of the core, 5 to 20, preferably 6 to 10 metal layers 7 are arranged one above the other, which are covered at the top and bottom by an insulator layer 8, respectively. In the preferred embodiment, layers of a nanocrystalline cobalt alloy are used which have a thickness of about 20 to 25 μm. For example, the metal foils of the "VITROVAC" brand from Vacuumschmelze GmbH can be used.
Bei der bevorzugten Ausführungsform reicht es zur Erzie¬ lung der gewünschten magnetischen Eigenschaften aus, nur we¬ nige, vorzugsweise sechs, Lagen dieser Metallschichten über- einander anzuordnen. Die übereinander angeordneten Metall- schichten sind derart elektrisch voneinander isoliert, daß der Stromfluß zwischen den Schichten erschwert ist. Dies kann bei¬ spielsweise durch eine zwischen den Schichten angeordnete Iso¬ latorschicht erreicht werden. Es ist aber auch vorgesehen, die Metallschichten (Folien) unmittelbar übereinander angrenzend zu stapeln, wobei die gewünschte Isolation aufgrund spezieller Oberflächeneigenschaften der Schichten gewährleistet ist. Die Verwendung nur weniger Schichten führt einerseits zu einem re¬ lativ flexiblen, d.h. biegbaren Kern, andererseits zu einer weiteren Gewichtsreduktion gegenüber herkömmlichen Ferritker¬ nen. Das reduzierte Gewicht der Induktionsspule führt zu einer doppelten Gewichtsreduktion, wenn diese Induktionsspule, wie erfindungsgemäß vorgesehen ist, in einem Kraftfahrzeugtürgriff eingebracht ist, denn in diesem Fall kann der im Inneren die Tür befindliche Ausgleichsmasse ebenfalls reduziert werden. In the preferred embodiment, to achieve the desired magnetic properties, it is sufficient to arrange only a few, preferably six, layers of these metal layers one above the other. The stacked metal layers are electrically isolated from each other so that the flow of current between the layers is difficult. This can be achieved, for example, by means of an insulating layer arranged between the layers. However, it is also envisaged to stack the metal layers (foils) immediately adjacent to one another, whereby the desired insulation is ensured on account of special surface properties of the layers. The use of only a few layers leads on the one hand to a relatively flexible, ie bendable core, on the other hand to a further reduction in weight compared to conventional ferrite cores. The reduced weight of the induction coil leads to a double weight reduction when this induction coil, such as is provided according to the invention, is introduced in a motor vehicle door handle, because in this case, the inside of the door located balancing mass can also be reduced.

Claims

Ansprüche claims
1. Sendeantennenanordnung zum Abstrahlen eines langwelli- gen Aufwecksignals für einen ID-Geber eines schlüssellosenA transmitting antenna arrangement for emitting a long-wave wake-up signal for a keyless ID transmitter
Kraftfahrzeugzugangssystems mit einer im Inneren eines Kraft¬ fahrzeugbauteils (1) angeordneten Induktionsspule (2) mit we¬ nigstens einer Wicklung (4) und einem von der Wicklung umgebe¬ nen Kern (3) , wobei der Kern (3) die Form eines flachen Streifens hat und aus mehreren übereinanderliegenden, sich über die gesamte Länge des Streifens erstreckenden Schichten besteht, wobei die Schichten Metallschichten (7) aus einer nanokristallinen oder amorphen, weichmagnetischen Metallegierung hoher Permeabilität umfassen, wobei jede der Metallschichten (7) eine Dicke zwi¬ schen 15 und 100 μm, vorzugsweise zwischen 20 und 30 μm, auf¬ weist und wobei die Metallschichten derart übereinander ange¬ ordnet sind, daß ein Stromfluß von einer Metallschicht zu ei¬ ner benachbarten erschwert ist.A motor vehicle access system having an induction coil (2) arranged inside a motor vehicle component (1) with at least one winding (4) and a core (3) surrounded by the winding, the core (3) being in the form of a flat strip and comprising a plurality of superimposed layers extending over the entire length of the strip, the layers comprising metal layers (7) of a nanocrystalline or amorphous, high permeability, soft magnetic metal alloy, each of the metal layers (7) having a thickness between 15 and 100 microns, preferably between 20 and 30 microns, auf¬ has and wherein the metal layers are arranged one above the other ange¬ such that a flow of current from one metal layer to ei¬ ner adjacent is difficult.
2. Sendeantennenanordnung nach Anspruch 1, dadurch gekenn¬ zeichnet, daß zwischen benachbarten Metallschichten dünne Iso¬ latorschichten angeordnet sind.2. Transmitting antenna arrangement according to claim 1, characterized gekenn¬ characterized in that are arranged between adjacent metal layers thin Iso¬ latorschichten.
3. Sendeantennenanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß 5 bis 20, vorzugsweise 6 - 10, Metall- schichten übereinander angeordnet sind.3. Transmitting antenna arrangement according to claim 1 or 2, characterized in that 5 to 20, preferably 6 - 10, metal layers are arranged one above the other.
4. Sendeantennenanordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Kraftfahrzeugbauteil ein4. Transmitting antenna arrangement according to one of claims 1 to 3, characterized in that the motor vehicle component a
Kraftfahrzeugtürgriff (1) ist.Motor vehicle door handle (1).
5. Sendeantennenanordnung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das langwellige Aufwecksignal eine Trägerfrequenz von etwa 20 bis 200 kHz vorzugsweise etwa 125 kHz aufweist. 5. Transmitting antenna arrangement according to one of claims 1 to 4, characterized in that the long-wave wake-up signal has a carrier frequency of about 20 to 200 kHz, preferably about 125 kHz.
EP05740735A 2004-08-02 2005-05-04 Transmitting antenna arrangement for emitting a longwave wake-up signal for an id transmitter in a keyless motor vehicle access system Withdrawn EP1776260A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004037682A DE102004037682A1 (en) 2004-08-02 2004-08-02 A transmitting antenna arrangement for emitting a long-wave wake-up signal for an ID transmitter of a keyless vehicle access system
PCT/EP2005/004870 WO2006015632A1 (en) 2004-08-02 2005-05-04 Transmitting antenna arrangement for emitting a longwave wake-up signal for an id transmitter in a keyless motor vehicle access system

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EP1776260A1 true EP1776260A1 (en) 2007-04-25

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US (1) US20070279300A1 (en)
EP (1) EP1776260A1 (en)
KR (1) KR20070044475A (en)
CN (1) CN1993256A (en)
DE (1) DE102004037682A1 (en)
WO (1) WO2006015632A1 (en)

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DE59811066D1 (en) * 1997-10-14 2004-04-29 Huf Huelsbeck & Fuerst Gmbh LOCKING DEVICE, IN PARTICULAR FOR MOTOR VEHICLES
JP4167320B2 (en) * 1998-03-31 2008-10-15 富士通テン株式会社 Wireless control device for vehicle and portable device thereof
JP3855253B2 (en) * 2000-06-13 2006-12-06 アイシン精機株式会社 Bar antenna and manufacturing method thereof
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Also Published As

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US20070279300A1 (en) 2007-12-06
CN1993256A (en) 2007-07-04
DE102004037682A1 (en) 2006-03-16
KR20070044475A (en) 2007-04-27
WO2006015632A1 (en) 2006-02-16

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