EP0348636B1 - Antenne für eine kleine Funkuhr - Google Patents

Antenne für eine kleine Funkuhr Download PDF

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Publication number
EP0348636B1
EP0348636B1 EP89107984A EP89107984A EP0348636B1 EP 0348636 B1 EP0348636 B1 EP 0348636B1 EP 89107984 A EP89107984 A EP 89107984A EP 89107984 A EP89107984 A EP 89107984A EP 0348636 B1 EP0348636 B1 EP 0348636B1
Authority
EP
European Patent Office
Prior art keywords
coil
antenna
strips
core
magnetic
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.)
Expired - Lifetime
Application number
EP89107984A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0348636A1 (de
Inventor
Wolfgang Ganter
Arthur Kopf
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.)
Junghans Uhren GmbH
Original Assignee
Junghans Uhren GmbH
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 Junghans Uhren GmbH filed Critical Junghans Uhren GmbH
Publication of EP0348636A1 publication Critical patent/EP0348636A1/de
Application granted granted Critical
Publication of EP0348636B1 publication Critical patent/EP0348636B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01Q1/273—Adaptation for carrying or wearing by persons or animals
    • G—PHYSICS
    • G04—HOROLOGY
    • G04R—RADIO-CONTROLLED TIME-PIECES
    • G04R60/00—Constructional details
    • G04R60/04—Antennas attached to or integrated in watch bracelets

Definitions

  • the invention relates to a magnetic antenna according to the preamble of claim 1.
  • a bracelet in the form of two curved stiff brackets is articulated to the housing and has cavities for receiving batteries or a loudspeaker and a magnetic antenna made of a ferrite core surrounded by a coil.
  • the ferrite core is a rigid body adapted to the cross-section of the cavity geometry, the axis of the core and antenna coil running transversely to the longitudinal extent of the bracelet clip arch and thus the length of the core being limited to its width oriented on the watch case.
  • a flexible cable runs along the clip arch over its linkage into the housing.
  • the invention is based on the object of developing an antenna of the generic type in such a way that it can be used as a powerful long-wave antenna for radio-controlled wristwatches with flexible bracelets.
  • a flexibly held core is provided for a loop antenna, as can be realized in a manner known as such by a layer structure, but flexible strips of soft magnetic materials of high permeability, such as amorphous metals in sheet form, which can be displaced relative to one another are now realized .
  • Such a magnetic antenna is now used as the bracelet antenna of a radio wristwatch in the flexible watch bracelet.
  • a structure of multilayer conductive foils laminated onto insulating foils is expediently used, in the middle of which a relatively narrow conductor extends, which is electrically shielded by wider conductive foils extending above and below it can also serve as a return line for the antenna connection to the radio clock receiver.
  • Such an electrically tunable ribbon cable is expediently glued to the core in front of the antenna coil, and a miniaturized matching capacitor for the antenna resonant circuit can also be applied in the connection area to the coil connecting wires.
  • the opposite end of the ribbon cable is equipped with plug-in means, which are preferably oriented approximately transversely to the longitudinal extent and thus transversely to the direction of pull of the ribbon cable entering a watch case and are plugged together there with complementary plug-in means for connection to the receiver in the watch case.
  • a soft elastic encapsulation of the antenna core with its coil expediently also includes the course of the ribbon cable up to the plug-in means positioned in the watch case, so that a clamp-fixing of the bracelet bezel at the entry into the watch case serves at the same time for mechanical fastening and moisture sealing of the connectors.
  • the capacitance for the tuning of the resonance circuit of the antenna coil can be integrated into the layer structure, for example by interconnecting individual layers - already to avoid eddy current losses - electrically mutually insulated from one another as mutual electrode groups to form the capacitor and connecting the antenna coil in parallel.
  • An autonomous (wrist) radio-controlled watch 11 which is only symbolically outlined in the drawing, is equipped with a radio receiver 12 for receiving and decoding time information which, if necessary, serves to correct the time currently displayed by the radio-controlled watch 11.
  • the receiver 12 is fed from an antenna 13 designed as an LC resonant circuit. This is constructed as a layered core frame antenna, that is to say from a coil 14 which is penetrated by a flexible core 15.
  • the core 15 is preferably layered as a vertical stack of very thin strips 16 of amorphous, soft magnetic, highly permeable material, such as those under the trade name VITROVAC from Vacuumschmelze GmbH (D-6450 Hanau) as extremely thin and spring-hard flexible sheets, in particular for the construction of low-loss transformers in switched-mode power supplies and for magnetic switches of pulse power supplies are launched on the market and are characterized by low sensitivity to mechanical stresses.
  • VITROVAC amorphous, soft magnetic, highly permeable material
  • This core 15 is clamped transversely to the surface extension of its strips 16 by a border 17, as symbolized in the drawing by the triangles of tension direction.
  • This border 17, for example designed as a plastic sleeve molded around the core 15, expediently also covers the coil 14 in order to fix it in position on the core 15 and to mechanically protect it against environmental influences. If the border 17 is flexible in order to give the antenna 13 different geometric shapes - for example for installation in limited space conditions or for configuration as a bracelet - the axial length 18 of the coil 14 is relatively limited in order to avoid the area of the non-flexible core 15 to keep small, which is stiffened by the applied coil 14.
  • a coil 14 that applies as little as possible over the core 15 is to be aimed at for electromagnetic reasons, because the field strength decreases quadratically over the distance from the core 15, that is to say winding layers of the coil 14 that are further away only make very small contributions from the field-strengthening effect of the core 15 experienced.
  • the coil 14 is expediently even introduced into a core constriction 48, as taken into account in FIGS. 5 and 6.
  • a free space 19 is left in front of the ends 16 of the strips 16 opposite the border 17 surrounding them. This enables a longitudinal displacement of individual strips 16 against one another when the core 15 is bent about its longitudinal axis.
  • the core 15 (FIG. 5) consists of individual or stacked strips 16 in frontal succession, with engagement of convexly rounded ends 49 each in concavely adapted joint sockets 50 of the adjoining strip 16.
  • the strips 16 (or the external ones) can also be replaced by a filling 51 made of soft ferrite powder in the assigned part of the flexible border 17 in the course of the bracelet 28.
  • the individual joint part strips 16 preferably consist of (sintered) ferrite.
  • a relatively stiff core 15 for example a single or multi-layer ferrite body
  • the connection to the clock 11 is then made via partial bracelets 28-28 which can be connected to the antenna core 15 via closures or articulated members 29.
  • the individual layers of the strips 16 are provided with interposed insulating layers 20, for example foils or lacquer layers, mechanically and electrically separated from each other.
  • a flexible material with a large dielectric constant is expediently used, such as is available on the market as the so-called X7R ceramic for the construction of small layer capacitors of high capacitance.
  • X7R ceramic for the construction of small layer capacitors of high capacitance.
  • common dielectrics such as mica or foils of polyester or polycarbonate and the like are more advantageous.
  • This insulating material can be coated or covered with electrically conductive electrodes in order to integrate the resonance capacitance 21 into the strip stack antenna 13 and to connect it electrically to the ends of the coil 14 within the protective enclosure 17, for example via welded connections 22. This reduces the capacitance value and thus the installation space requirement of an external tuning capacitor 23, provided that this cannot even be eliminated entirely by the integrated resonance capacitance 21.
  • the electrically conductive core strips 16 themselves can serve as the capacitor electrodes on both sides of dielectric insulating films 20, so that the additional layering of separate capacitor electrodes on both sides of the insulating films 20 is unnecessary.
  • these electrode strips 16 in the interest of a large effective electrode area and thus a high capacitance value, are alternately interconnected in such a way that electrode groups 24.1, 24.2, which mesh with one another in alternating fashion, result.
  • the outer strip 16.1 or 16.2 can serve as a conductor for closing the coil connections 22.1, 22.2 to antenna connections 25.1, 25.2 leading to the outside.
  • Flexible interconnections 26.1, 26.2 between the electrode strips 16 of the electrode groups 24 in the area of the associated free spaces 19.1, 19.2 ensure that the strips 16 can be displaced alternately in parallel with one another when the ferrite core 15 is subjected to bending stress.
  • the antenna 13 from the coil 14 with the core 15 and optionally the resonance capacitance 21 can be connected via lines 27 to the radio receiver 12 of the clock 11, in whose housing this antenna 13 is inserted. If it is a portable radio-controlled watch 11 and in particular a training as a wristwatch, the flexible antenna 13 is expediently also designed as a bracelet 28 by its bezel 17, as outlined in the drawing by articulated links 29.
  • a (wrist) radio-controlled clock 11 can be realized, when designing the size or design for installation space required for a receiving antenna 13 no longer has to be taken into account.
  • a layered antenna 13 designed as a bracelet 28 or arranged on the bracelet provides an astonishingly high performance compared to conventional cylindrical ferrite cores as coil carriers, because the antenna voltage is proportional to and approximately proportional to the core cross section and above all the (very large) permeability of the core material to the core length and roughly inversely proportional to the core thickness.
  • the core 15 carrying the coil 14 can, however, be of small thickness because of the high permeability, with, in the interest of good flexibility of the bracelet 28, the long axial length of the core 15 in relation to the magnetically effective thickness of the stacked core strips 16 as such.
  • the electrical connection of the antenna 13 to the receiver 12 sketched in FIG. 1 to the watch case via wristband articulated sliders 29 is not sufficiently reliable, for example due to movements or dirt deposits between the articulated members.
  • Free cables 27 can also interfere aesthetically or electrically, especially since they must be equipped with connectors for connection to the watch case, which would have to be designed to be moisture-proof with considerable construction effort.
  • this layer structure of the ribbon cable 31 is fastened in the region in front of the coil end 35 to the surface of the flexible strip core 15 passing through the coil 14 by means of an insulating adhesive layer 36.
  • connection end 37 (see Fig. 3) of the ribbon cable 31 in the upper shielding foil 33 '(omitted for the illustration of Fig. 3) and in the insulating foil 34 ⁇ above the lower foil 33 ⁇ recesses, here around the coil connecting wires 22 to be able to connect to the central conductor 32 and to the lower shielding foil 33 ⁇ serving as a return conductor.
  • a tuning capacitor 23 is required for antenna tuning, it is also expediently arranged in this connection area between the ribbon cable 31 and the antenna coil 14, for example as a surface-mounted chip capacitor connected conductively between the conductor 32 and the conductive foil 33 ⁇ .
  • the overmolded antenna mount 17 then also surrounds this connection of the ribbon cable 31 equipped with the capacitor 23 to the antenna coil 14 on the surface of the flexible antenna core 15.
  • the ribbon cable 31, as taken into account in FIG. 3, can initially emerge with a constant width in the interest of high bending strength, in order to then transition into a more flexible zone of a line taper 38.
  • Plug-in means 43 are inserted into these eyes 40, 42 In order (in FIG. 4) to be able to be connected mechanically and electrically in the edge region of, for example, a wristwatch housing 44 with connecting conductors 45 insulated there to the radio clock receiver 12 in the plugging direction transverse to the longitudinal extension of the ribbon cable 31.
  • a housing clamp connection 46 is provided for moisture-proof compression mounting of the elastic encapsulation 17, which ends with the connection region 39 of the ribbon cable 31 in a connection cavity 47.
  • this housing-fixed counter contacts to the plug-in means 43 in the ribbon cable eyes 40, 42 are arranged insulated. This results in a moisture-proof and mechanically highly stressable electrically high-quality antenna connection to the receiver 12 in, for example, a wristwatch housing 44.
  • a compensation control can act on the resonant circuit capacitance in the receiver 12, for example by means of a switchable capacitance cascade or via the corresponding activation of a capacitance diode.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Support Of Aerials (AREA)
  • Electric Clocks (AREA)
  • Details Of Aerials (AREA)
EP89107984A 1988-05-27 1989-05-03 Antenne für eine kleine Funkuhr Expired - Lifetime EP0348636B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3817943 1988-05-27
DE3817943 1988-05-27
DE8815967U 1988-12-23
DE8815967U DE8815967U1 (de) 1988-05-27 1988-12-23 Antenne für eine kleine Funkuhr

Publications (2)

Publication Number Publication Date
EP0348636A1 EP0348636A1 (de) 1990-01-03
EP0348636B1 true EP0348636B1 (de) 1993-09-01

Family

ID=25868484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89107984A Expired - Lifetime EP0348636B1 (de) 1988-05-27 1989-05-03 Antenne für eine kleine Funkuhr

Country Status (5)

Country Link
US (1) US4947179A (zh)
EP (1) EP0348636B1 (zh)
DE (2) DE8815967U1 (zh)
ES (1) ES2043938T3 (zh)
HK (1) HK5595A (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10329335B4 (de) * 2003-05-28 2005-07-21 Stauber, Siegfried, Dipl.-Ing. Suchantennen-Polarisationsinstrument für eine Material-Detektoreinrichtung

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JPH02223205A (ja) * 1988-11-02 1990-09-05 Kurieiteitsuku Japan:Kk アンテナ
US5135694A (en) * 1989-11-10 1992-08-04 Seiko Epson Corporation Electronic device wristband
US5159347A (en) * 1989-11-14 1992-10-27 E-Systems, Inc. Micromagnetic circuit
DE3941913C1 (en) * 1989-12-19 1991-02-07 Heinz-Juergen 8000 Muenchen De Roth Wrist or pocketwatch - has appts. for reception of normal time transmission
DE9000899U1 (de) * 1990-01-27 1991-05-23 Junghans Uhren Gmbh, 78713 Schramberg Autonome Funkuhr
DE9010270U1 (de) * 1990-05-04 1991-09-05 Junghans Uhren GmbH, 7230 Schramberg Autonome Funkuhr
JP2985296B2 (ja) * 1990-05-16 1999-11-29 セイコーエプソン株式会社 電子機器のアンテナ接続装置
US5189431A (en) * 1990-10-22 1993-02-23 Motorola, Imc. Removable antenna coupling on a wrist watch pager
US5144325A (en) * 1991-08-02 1992-09-01 Motorola, Inc. Detachable wrist band antenna
DE9111096U1 (de) * 1991-09-07 1993-01-07 Junghans Uhren GmbH, 7230 Schramberg Funkuhr-Werk
DE69220029T2 (de) * 1992-02-05 1997-09-18 Texas Instruments Inc Verfahren zur Herstellung eines flachen, flexiblen Antennenkerns für einen Chip-Transponder, eingebaut in einer Karte oder ähnlichem Objekt und ein derart hergestellter Antennenkern
EP0554486B1 (en) * 1992-02-05 1998-07-22 Texas Instruments Deutschland Gmbh Method of producing a flexible HF antenna
US5638080A (en) * 1993-01-22 1997-06-10 Texas Instruments Incorporated Manufacture of a flexible antenna, with or without an inner permeable magnetic layer
US6219529B1 (en) * 1994-07-19 2001-04-17 Seiko Instruments Inc. Wireless communication system using only the magnetic field component
US5986566A (en) * 1994-08-18 1999-11-16 Oi Denki Co., Ltd. Wrist band antenna
DE9414353U1 (de) 1994-09-05 1996-01-11 Junghans Uhren Gmbh, 78713 Schramberg Antennenarmband für eine autonome Funkarmbanduhr
KR100459839B1 (ko) * 1995-08-22 2005-02-07 미쓰비시 마테리알 가부시키가이샤 트랜스폰더용안테나및트랜스폰더
DE29714185U1 (de) * 1997-08-08 1998-12-03 Gebrüder Junghans GmbH, 78713 Schramberg Funkarmbanduhr
GB9917678D0 (en) * 1999-07-29 1999-09-29 Koninkl Philips Electronics Nv Body-worn personal communications apparatus
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WO2000038495A2 (de) * 2000-01-13 2000-07-06 Phonak Ag Hörgerät-fernsteuerung und hörgerät mit einer solchen
US7170462B2 (en) * 2002-09-11 2007-01-30 Citizen Watch Co., Ltd. Antenna structure and radio controlled timepiece
EP1416582B1 (fr) * 2002-10-28 2008-06-25 ETA SA Manufacture Horlogère Suisse Dispositif électronique portable comportant des moyens permettant d'établir une connexion électrique à l'intérieur d'un boitier du dispositif
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EP1513222B1 (fr) * 2003-09-03 2014-04-16 ETA SA Manufacture Horlogère Suisse Objet portable à bracelet muni de bride de contact électrique à travers le boîtier, et procédé de montage de la bride
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10329335B4 (de) * 2003-05-28 2005-07-21 Stauber, Siegfried, Dipl.-Ing. Suchantennen-Polarisationsinstrument für eine Material-Detektoreinrichtung

Also Published As

Publication number Publication date
EP0348636A1 (de) 1990-01-03
HK5595A (en) 1995-01-20
DE58905431D1 (de) 1993-10-07
US4947179A (en) 1990-08-07
ES2043938T3 (es) 1994-01-01
DE8815967U1 (de) 1989-09-21

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