EP1611639A1 - Antenne comprenant un noyau de ferrite, destinee a un systeme de fermeture de porte d'automobile - Google Patents

Antenne comprenant un noyau de ferrite, destinee a un systeme de fermeture de porte d'automobile

Info

Publication number
EP1611639A1
EP1611639A1 EP04723950A EP04723950A EP1611639A1 EP 1611639 A1 EP1611639 A1 EP 1611639A1 EP 04723950 A EP04723950 A EP 04723950A EP 04723950 A EP04723950 A EP 04723950A EP 1611639 A1 EP1611639 A1 EP 1611639A1
Authority
EP
European Patent Office
Prior art keywords
frame
ferrite core
antenna
antenna according
named
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Withdrawn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
EP04723950A
Other languages
German (de)
English (en)
Inventor
Elio Mariotto
Peter Kull
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.)
Schaffner EMV AG
Original Assignee
Schaffner EMV AG
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 Schaffner EMV AG filed Critical Schaffner EMV AG
Publication of EP1611639A1 publication Critical patent/EP1611639A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • B60R25/245—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user where the antenna reception area plays a role
    • 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
    • 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

Definitions

  • the present invention relates to an antenna, in particular a mechanically reinforced antenna, for example an antenna, which can be used for a car door locking system.
  • a vehicle door locking system is unlocked by means of an electronic control circuit integrated in the vehicle door handle, that is, from a state that prevents opening of the door or flap to a state that enables opening of the door or flap.
  • a contactless portable data carrier for example in a chip card or in a key hanger
  • the data query is triggered by a mechanical switching element or by a proximity sensor, which triggers the forwarding of a data query to the external portable data carrier when a person approaches the handle.
  • the data carrier for example a transponder
  • the control circuit only releases the door when the identification is valid.
  • known electronic control circuits for vehicle door locking systems often comprise a transmitter or a transceiver with an antenna, which consists, for example, of an induction coil.
  • the induction coil generates an electromagnetic field that is received by the external data carrier.
  • the desired range is typically around one and a half meters.
  • an induction coil with a large inductance must be provided.
  • Such an inductance can only be achieved if the induction coil comprises a large ferrite core.
  • the induction coil must be installed outside the car body so that the electromagnetic field is not damped.
  • the optimal position for mounting the induction coil is inside the car door handle, very close to the data carrier of an approaching person and to the other electronic and mechanical parts of the car door locking system.
  • Another goal is to provide an antenna in which the ferrite core does not fall apart in the event of a break.
  • Another goal is to provide an antenna that can also be used for purposes other than car door locking systems.
  • an electronic circuit having a carrier (for example a printed circuit board or a housing) and an antenna with a ferrite core and a plurality of windings attached to the named carrier.
  • a carrier for example a printed circuit board or a housing
  • an antenna with a ferrite core and a plurality of windings attached to the named carrier.
  • a frame is provided around, the windings being wound around the named frame.
  • the antenna is attached to the carrier in such a way that the named ferrite core can move along its longitudinal axis.
  • an antenna having a ferrite core and a plurality of turns, a frame being provided around the said ferrite core, the named turns being wound around the named frame, and the frame being only two opposite long sides of the Ferrite core covers.
  • an antenna with a ferrite core and a plurality of turns, in which a metal frame is provided around the ferrite core, the turns being wound around the frame.
  • the frame can consist of sheet metal foils, for example.
  • the frame In the event of a break, the frame also prevents the ferrite from falling apart.
  • the ferrite parts remain gapless, so that an air gap and thus a decrease in the inductance is avoided.
  • air gaps that could still arise are bridged magnetically by the metal frame.
  • the frame can also reduce the electromagnetic radiation and sensitivity of the ferrite core.
  • Fig. 1 is a perspective view of a first embodiment of the antenna with a frame made of plastic and a carrier (in this case a plastic housing) which can be installed in a car door handle.
  • a carrier in this case a plastic housing
  • FIG. 2 shows a detail of one end of the antenna of FIG. 1.
  • FIG. 3 shows a detail of the other end of the antenna of FIG. 1.
  • Fig. 4 is a perspective view of a first embodiment of the antenna of Figure 1 with a frame made of plastic, without a carrier.
  • Fig. 7 shows a detail of the other end of the antenna of Figure 1, without a carrier.
  • Fig. 9 is a partial perspective view of the antenna of Figure 1 with a frame made of plastic, a carrier (in this case a plastic housing) and a circuit board.
  • Fig. 10 is a perspective view of the antenna of Figure 1 on a circuit board
  • FIG. 11 shows a detail of FIG. 10
  • Fig. 12 is a cross section of the antenna of Figure 1 in the frame and in the housing.
  • FIG. 13 shows a perspective illustration of a second exemplary embodiment of the antenna with a frame which consists of two sheet metal foils.
  • FIGS. 10 and 11 show a first embodiment of an antenna according to the invention, which is particularly suitable for a vehicle door locking system in a car door pull handle.
  • the control circuit 1 of the locking system can be seen in particular in FIGS. 10 and 11. It comprises a printed circuit board 2 on which all components of the control circuit 1 are mounted.
  • the circuit board 2 preferably has a thickness of 0.3 mm or less, preferably even 0.2 mm or less, and is therefore flexible and hardly susceptible to breakage. It is housed in a synthetic insulating housing 13 which longitudinally fills most of a cavity in a car door handle.
  • the control circuit comprises a touch sensor, not shown, which triggers a signal as soon as the user places a finger on the outer side of the handle.
  • a proximity sensor 5 triggers another signal when a hand or another grounded object approaches.
  • the data carrier preferably consists of a transponder (which can be integrated, for example, in a chip card or in a key holder) and is "awakened" by this data query. If the data query is addressed to him, he responds with a response which includes an identification of the data carrier or which is signed with such an identification. The response is received by the electronic locking system in the vehicle in order to trigger the unlocking of the car door locking system if it contains the expected identification or if it was signed with this expected identification.
  • the control circuit 1 comprises a contactless transmitter-receiver in order to exchange data with the external contactless data carrier.
  • the contactless transceiver comprises an antenna with an induction coil 3.
  • the induction coil consists, for example, of a winding of an electrically insulated wire 32 on a plate-shaped ferromagnetic ferrite core 31.
  • the length of the ferrite core 31 is greater than 40 mm. Its thickness is preferably less than 4 mm, so that assembly in a car door handle is possible.
  • the profile of the ferrite core 31 is X-shaped.
  • ferrite core is used in this description and in the claims as a general term for all soft-magnetic induction coil cores.
  • the induction coil 3 comprises a frame 30 around the ferrite core 31, the windings being wound around the frame. Since the winding is not made directly around the ferrite core 31, the mechanical stress on the ferrite core by the winding is also reduced and the insulation between the winding wire and the ferrite core is increased.
  • the frame consists of a single plastic part, which can be injection molded, for example, and which extends over the entire length of the small side of the ferrite core.
  • the inner width of the frame 30 corresponds to the width of the ferrite core with a small tolerance, so that no lateral play remains between the ferrite core 31 and the frame 30 and the ferrite core is thus precisely laterally positioned.
  • a plastic part can be manufactured much more precisely than the ferrite core, so that better position tolerances are achieved.
  • the plastic frame is preferably made from a single part, so that it is stable and that there are no play tolerances due to the connection between several parts.
  • the ferrite core 31 can preferably be displaced by at least one millimeter along its longitudinal axis. The play between the ferrite core and the housing also permits easier assembly of the ferrite core.
  • the antenna is preferably not cast in. This also reduces the forces caused by the potting compound. In addition, the stray capacities are reduced and stabilized by the air insulation (compared to a solution with polyamide molding or potting).
  • One end of the frame 30 is fixed by two posts 130 which engage in holes 300. As a result, it is positioned exactly in the housing 13 (FIGS. 1 to 3) and assembly is only possible in the correct direction. At the other end, the frame can move freely, which further reduces stresses due to bending and thermal expansion. The frame 30 is thus fastened in a clearly unmistakably defined mounting position in the housing.
  • the turns 32 are wrapped around the frame 30.
  • the winding wire ends 320 are hooked into grooves 301 of the frame 30 and fixed and positioned for further connection precisely and reproducibly, so that they can be soldered on automatically or soldered on with ultrasound.
  • the grooves 301 and a wire guide 302 define the winding direction, so that the wires cannot be fixed if the winding direction is incorrect.
  • the wires leave the plastic frame at the level of the circuit board so that they can be soldered or welded more easily.
  • the wire guide also allows the wire ends 320 to be guided precisely, so that the scattering factor of the antenna is reduced and stabilized. In addition, the risk of short circuits between the windings and the ferrite edges is eliminated.
  • the wire length can also vary with different ferrite large constant, which leads to a stable inductance value. In cold conditions, the wire stretch is reduced by the elasticity of the plastic frame 30.
  • Housing 13 has longitudinal walls 131 that laterally position the sides of frame 30 without holes, without restricting its longitudinal position.
  • the walls 131 also separate the antenna 3 from the proximity electrodes 5 (FIG. 11).
  • a transverse wall 132 also separates the antenna 3 from the connection space, so that the connection space can be sealed by means of potting, glue or overmoulding.
  • a V-groove 310 shown in FIG. 12 latches in the frame 30 on both longitudinal flanks of the ferrite core 31. After the winding, the ferrite core 31 and the frame 30 are thus connected to one another without play. A longitudinal movement is still possible without great forces by sliding. The frame and the V-groove also prevent the ferrite core from falling apart in the event of a break, so that a function with reduced properties is made possible.
  • the antenna 3 is mounted on a printed circuit board 2 in the housing 13, a distance between the housing 13 and the printed circuit board 2 being defined by the antenna, as can be seen in particular in FIG. 9.
  • the circuit board is positioned through the posts 130 of the housing 13 and secured by collars 3000 around the holes 300 through the frame 3.
  • the collars 3000 can have different shapes in order to prevent the circuit board 2 from being inserted on the wrong side.
  • the control circuit 1 mentioned is also mounted on the printed circuit board 2.
  • the protective frame 13 and the possibility of the ferrite core 3 moving longitudinally within the frame and the frame inside the housing has the advantage that breakage of the ferrite core is very unlikely, so that large, sudden deviations in the inductance of the antenna are prevented. It should also be noted that the ferrite core 31 can move longitudinally to the two carriers 13 and 2.
  • the antenna 3 is preferably first mounted and soldered on the printed circuit board 2 and then fastened in the housing.
  • this has the disadvantage that the connecting wires for connection to the printed circuit board are led out through slots and then have to be soldered.
  • the frame around the ferrite core 31 consists of two foils 30A and 30B (for example sheet metal foils which are glued, glued, welded, soldered, laminated, rolled, poured or evaporated onto the ferrite core).
  • the foils 30A, 30B are made of a material with good high-frequency properties and the highest possible strength and elasticity.
  • the thickness is approximately 0.025mm. Thicker foils give higher strengths, but lower spool qualities, while thinner foils give higher spool qualities and lower strength.
  • the foils consist of several laminated layers, for example each 0.025mm thick; this allows the strength to be increased without reducing the quality of the coil.
  • Suitable foils are, for example, a transformer plate of 0.05mm, a high-silicon special core sheet (NK Super HF-Core) and one or more Finemet (protected trademark) or amorphous core foils. In one embodiment, not shown, only one side of the ferrite core is covered with a film.
  • a different material is used for the foils 30A, 30B laminated onto the ferrite core, for example non-ferrous metal of approximately 0.05 mm thickness or a high-strength plastic material, for example glass-fiber reinforced epoxy, as is used for printed circuit boards.
  • the ferrite core framed in this way can be provided with surface insulation before winding. This can be done by painting, powder coating, dipping, wrapping with insulating foils, insulating tape, overmolding with hard plastic or soft plastic in the form of a bobbin.
  • U-profiles or frames can be used as winding wire protection and guidance.
  • the foils 30A, 30B mechanically reinforce the ferrite core 31 against breakage and, in the event of breakage, prevent an appreciable air gap from being created. If an air gap were nevertheless created, it would be bridged magnetically and the inductance would decrease only insignificantly. In addition, a possible point load is distributed, so that chipping or breaking out of corners is avoided.
  • the sheet metal foils 30A, 30B are preferably grounded with low resistance, so that the electromagnetic radiation and sensitivity are greatly reduced. Silvering the sheets could also further improve the shielding effect.
  • This second embodiment can be used for car door handles as well as for other antenna applications (including radio receivers, transmitters, direction finders, navigation devices, metal detectors, etc.).
  • the frame 30 preferably covers only two or at most four opposite sides of the ferrite core, so that only one, or two, dimensions of the ferrite core are enlarged by the frame.
  • only one of the critical small dimensions of the ferrite core that is to say only the height or only the thickness
  • the core 31 of the antenna 3 and thus the entire antenna 3 is flexible.
  • the flexible core 31 consists, for example, of several thin, flexible layers of a magnetic material which are held together with flexible fastening means.
  • the magnetic core is formed from an amorphous magnetic material (that is to say from a flexible casting compound into which small particles of a material with high permeability, such as ferrite particles, for example, are cast).
  • the magnetic core is in several parts. For example, it consists of several smaller parts made of a possibly hard magnetic material such as ferrite, which are preferably connected to a magnetic flexible material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Computer Security & Cryptography (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Support Of Aerials (AREA)

Abstract

La présente invention concerne un circuit électronique comprenant : un support (2; 13) ; au moins une antenne (3) fixée sur ledit support et comprenant un noyau de ferrite (31) et une pluralité d'enroulement (32) ; une armature (30) qui entoure ledit noyau de ferrite (31). Selon l'invention, lesdits enroulements sont enroulés autour de ladite armature et ladite antenne (3) est fixée audit support (2; 13) de sorte que le noyau de ferrite peut se déplacer le long de son axe longitudinal. Dans un autre mode de réalisation, un autre matériau est utilisé pour les films (30A, 30B) qui sont laminés sur le noyau de ferrite, par exemple un métal non ferreux d'environ 0,05 mm d'épaisseur ou une matière plastique à dureté élevée, par exemple de l'époxy renforcé par fibres de verre tel que celui utilisé pour des cartes de circuits imprimés.
EP04723950A 2003-04-10 2004-03-29 Antenne comprenant un noyau de ferrite, destinee a un systeme de fermeture de porte d'automobile Withdrawn EP1611639A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6592003 2003-04-10
PCT/CH2004/000189 WO2004091044A1 (fr) 2003-04-10 2004-03-29 Antenne comprenant un noyau de ferrite, destinee a un systeme de fermeture de porte d'automobile

Publications (1)

Publication Number Publication Date
EP1611639A1 true EP1611639A1 (fr) 2006-01-04

Family

ID=33136758

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04723950A Withdrawn EP1611639A1 (fr) 2003-04-10 2004-03-29 Antenne comprenant un noyau de ferrite, destinee a un systeme de fermeture de porte d'automobile

Country Status (2)

Country Link
EP (1) EP1611639A1 (fr)
WO (1) WO2004091044A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005057556B4 (de) * 2005-11-30 2018-12-27 Huf Hülsbeck & Fürst GmbH & Co KG Ferritkern-Antennenanordnung für einen Kraftfahrzeug-Türaußengriff
DE102006003999B4 (de) * 2006-01-27 2012-04-05 Vogt Electronic Components Gmbh Antenne und Verfahren zu deren Herstellung
DE102006011086B4 (de) * 2006-03-08 2017-03-02 Huf Hülsbeck & Fürst Gmbh & Co. Kg Antennenanordnung für einen Kraftfahrzeug-Türaußengriff
DE102006025081B4 (de) * 2006-05-30 2023-08-03 HELLA GmbH & Co. KGaA Antennen-Elektronikmodulträger, sowie Antennenmodul und Antennen-Locksensormodul
US8552827B2 (en) * 2006-07-21 2013-10-08 Sumida Corporation Coil component
FR2920916B1 (fr) * 2007-09-12 2011-03-25 Valeo Securite Habitacle Procede de fabrication d'un capteur d'approche etanche aux conditions environnementales exterieures, capteur d'approche etanche aux conditions environnementales exterieures et poignee associee
DE102016010561A1 (de) * 2016-08-31 2018-03-01 Huf Hülsbeck & Fürst Gmbh & Co. Kg Kraftfahrzeugtürgriffanordnung mit Antenne
DE102017008340A1 (de) * 2017-09-05 2019-03-07 Huf Hülsbeck & Fürst Gmbh & Co. Kg Kraftfahrzeugtürgriffanordnung mit eingegossener Elektronik

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4755827A (en) * 1987-02-04 1988-07-05 The United States Of America As Represented By The Secretary Of The Army Millimeter wavelength monolithic ferrite circulator/antenna device
JP3855253B2 (ja) * 2000-06-13 2006-12-06 アイシン精機株式会社 バーアンテナおよびその製造方法
DE10103068C1 (de) * 2001-01-24 2002-08-22 Vogt Electronic Ag Wicklungsträger für Ferritkernantennen
DE10125080A1 (de) * 2001-05-23 2002-12-19 Pemetzrieder Neosid Induktives elektrisches Bauelement, insbesondere Ferritantenne, sowie Verfahren zur Herstellung und zum Abgleich desselben
WO2003071068A1 (fr) * 2002-02-22 2003-08-28 Schaffner Emv Ag Bobine d'inductance destinee notamment au systeme de fermeture d'une portiere de vehicule
AU2003203120A1 (en) * 2002-02-22 2003-09-09 Schaffner Emv Ag Electronic control circuit comprising a proximity sensor and a transceiver for a vehicle door locking system
EP1513999A1 (fr) * 2002-06-20 2005-03-16 Schaffner Emv Ag Circuit de commande electronique comprenant un emetteur pour systeme de fermeture de portiere de vehicule

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004091044A1 *

Also Published As

Publication number Publication date
WO2004091044A1 (fr) 2004-10-21

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