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Publication numberUS20020000942 A1
Publication typeApplication
Application numberUS 09/843,474
Publication dateJan 3, 2002
Filing dateApr 26, 2001
Priority dateSep 23, 1998
Also published asDE69935565D1, DE69935565T2, EP0989028A2, EP0989028A3, EP0989028B1, US6259412, US6380902
Publication number09843474, 843474, US 2002/0000942 A1, US 2002/000942 A1, US 20020000942 A1, US 20020000942A1, US 2002000942 A1, US 2002000942A1, US-A1-20020000942, US-A1-2002000942, US2002/0000942A1, US2002/000942A1, US20020000942 A1, US20020000942A1, US2002000942 A1, US2002000942A1
InventorsBernard Duroux
Original AssigneeBernard Duroux
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Vehicle exterior mirror with antenna
US 20020000942 A1
Abstract
An exterior rear view mirror for a motor vehicle comprises a case containing a reflective member and an antenna, consisting of an electrically conductive layer on a surface of the case, for transmitting and/or receiving radio frequency electromagnetic radiation. The electrically conductive layer has at least one zone having its periphery shaped in accordance with the frequency of said electromagnetic radiation.
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Claims(17)
1. An exterior rear view mirror for a motor vehicle comprising a case containing a reflective member and an antenna for transmitting and/or receiving radio frequency electromagnetic radiation comprising an electrically conductive layer on a surface of the case, characterized in that the electrically conductive layer comprises a first zone having its periphery shaped in accordance with the frequency of said electromagnetic radiation.
2. A rear view mirror according to claim 1, wherein the length of said first zone is substantially equal to about three tenths of the wavelength of said electromagnetic radiation.
3. A rear view mirror according to claim 2, wherein said first zone is formed on a curved part of the surface of the case so as to form a part-conical antenna, the half cone angle θ of which is related to the length └, the feed-point impedance Zo and the wavelength λ by the formula:
(Zo/π)Ln Cot gθ/2=1500(└/λ)−113,3
4. A rear view mirror according to claim 1, wherein the electrically conductive layer comprises a further zone for receiving electromagnetic radiation of a frequency different from that received by said first zone.
5. A rear view mirror according to claim 1, wherein the electrically conductive layer is located on the inside surface of the case.
6. A rear view mirror according to claim 1, wherein the case has an exterior cover member and the electrically conductive layer is applied to the inner surface of said exterior cover member.
7. A rear view mirror according to claim 1, wherein the case has an exterior cover member and the conductive layer is located on a part of the outer surface of the mirror case, which is enclosed by the cover member.
8. A rear view mirror according to claim 1, wherein the electrically conductive layer comprises foil secured by adhesive.
9. A rear view mirror according to claim 1, wherein the electrically conductive layer comprises an insert moulding formed as part of one of the case and the cover member.
10. A rear view mirror according to claim 1, wherein the case is formed as co-moulding of two different plastics material, only one of which is capable of accepting surface metallisation, and the conductive layer comprises metallisation deposited thereon.
11. A rear view mirror according to claim 1, wherein the electrically conductive mirror comprises first and second zones which are shaped so that the first zone is a mirror image of the second zone.
12. A rear view mirror according to claim 1, having at least one additional antenna formed as self-supporting rigid member located within the mirror case.
13. A rear view mirror according to claim 1, having an antenna for a mobile telephone.
14. A rear view mirror according to claim 1, having an antenna for FM radio reception
15. A rear view mirror according to claim 1, having an antenna for receiving GPS signals.
16. A rear view mirror according to claim 1, having an antenna for a remote operation of the car door locks.
17. A rear view mirror according to claim 1, having an antenna for a for an automatic road toll accounting system.
Description
    RELATED APPLICATIONS
  • [0001]
    This application is a continuation of U.S. Ser. No. 09/404,101 filed Sep. 23, 1999.
  • FIELD
  • [0002]
    This invention relates to an exterior rear view mirror for a motor vehicle comprising a case containing a mirror glass or other reflective member and an antenna for transmitting and/or receiving radio frequency electromagnetic radiation comprising an electrically conductive layer on a surface of the case.
  • RELATED ART
  • [0003]
    An exterior mirror of this type is disclosed in GB-A-1590824. The case comprises a body moulded from plastics material having a bright copper layer deposited on substantially the whole of its outer surface for receiving a chromium-plated outer layer. The bright copper layer also serves as an antenna.
  • SUMMARY OF THE INVENTION
  • [0004]
    According to the invention, in a rear-view mirror assembly of the type described above, the antenna comprises an electrically conductive layer on a surface of a rigid member forming part of the mirror assembly.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0005]
    [0005]FIG. 1 is a perspective view of a vehicle exterior mirror in accordance with the invention;
  • [0006]
    [0006]FIG. 2 is a perspective view of the case of the mirror shown in FIG. 1;
  • [0007]
    [0007]FIG. 3 is a perspective view of the mirror case shown in FIG. 2, from a different angle;
  • [0008]
    [0008]FIG. 4 is a view into the mirror case of FIGS. 2 and 3 through the opening in which the mirror glass would be mounted;
  • [0009]
    [0009]FIG. 5 is a cross-sectional view taken on the line 5-5 in FIG. 4;
  • [0010]
    [0010]FIG. 6 is a cross-sectional view taken on the line 6-6 in FIG. 4; and
  • [0011]
    [0011]FIG. 7 is a diagram illustration dimensions of a theoretical conical antenna.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • [0012]
    [0012]FIG. 1 shows a vehicle rear-view mirror comprising a reflective member 10 fitted in a case 11, which is mounted on a bracket 12, which is secured to one of the front doors 14 of a motor car 16. As can be seen from FIG. 2, the case 11 has a clip 18 and guides 20 and 22 by means of which it is secured to an internal frame member (not shown) of the mirror assembly. In accordance with the invention, a first metallic foil element 30 is secured by adhesive to the inside surface of the outboard end of the case 11. As can best be seen from FIG. 4, the element 30 is formed in two symmetrical halves 30 a and 30 b interconnected by a link part 32 which is connected by a coaxial cable 34 to a mobile telephone (not shown). The two symmetrical halves 30 a and 30 b approximate to a conical antenna. FIG. 7 shows a cone of half cone angle θ and length └. Theoretically └ should be equal to wavelength λ of the radio signals (i.e. the speed of light divided by the centre frequency). In practice, acceptable results are achieved if └ is three tenths of the theoretical value.
  • [0013]
    The theoretical formula for the feed-point impedance (Zk) of a conical antenna is:
  • Zk=(Zo/π)Ln cot g(θ/2)
  • [0014]
    where Zo is the free space impedance (377 ohms in air) and “Ln cot g” means “logarithmic cotangent”. 30 is a realistic practical value for θ.
  • [0015]
    The relationship between the angle θ and the impedance of the antenna is linear. Good reception can be obtained if the actual feed-point impedance is between half and twice its optimum value. Provided this condition is met, it can be shown from FIGS. 8-15 on page 355 of John D. Kraus, “Antennas”, published by McGraw Hill, ISBN 0-07-0354-22-7, that, because the curve is practically linear in the area used, a practical optimised value Zo for the actual feed-point impedance is:
  • Zo=1500(└/λ)−113-3
  • [0016]
    It follows that the length └ of the foil elements 30 a and 30 b and the half-cone angle θ is:
  • (Zo/π)Ln Cot gθ/2=1500(└/λ)−113-3
  • [0017]
    In practice, the length └ of foil element may be about three tenths of the wavelength λ.
  • [0018]
    Two other foil elements 36 and 38 that are a mirror image of one another are secured by adhesive to the central and inboard parts of the interior surface of the case 11. These foil elements 36 and 38 are connected by a cable 40 to a radio broadcast receiver, for example an FM radio receiver (not shown).
  • [0019]
    In addition to the above two antennae, a third antenna 42 is connected by a cable 44 to a transponder (not shown) for an automatic road toll charging system; a fourth antenna 46 is connected by a cable 48 to a controller for the central door locking system for the car 16. Another antenna 50, positioned in the centre of the mirror case 11 is connected by a cable 52 to a digital radio receiver (not shown) while a further antenna 54 is connected by a cable 56 to a GPS receiver (also not shown).
  • [0020]
    The antennae 42, 46, 50 and 54 are rigid antennae mounted within the case 11. Although the various cables 34, 40, 44, 48, 52 and 56 are shown as parallel to one another, in practice they are gathered together so as to extend through the interior of the bracket 12 into the interior of the car 16, where they are connected to their respective transmitters and/or receivers.
  • [0021]
    Antennae comprising metal inserts moulded into the case 11 may replace the foil antennae 30, 36 and 38. Another alternative is for the case or cover member to be formed as co-moulding of two different plastics material, only one of which will accept surface metallisation. A layer of metal is then deposited on this part to serve as the antennae.
  • [0022]
    If the case has a separate decorative exterior cover member of the type described in European Patent Application No. 98302674.1, the electrically conductive layer may be formed either on the inner surface of such cover member or on that part of the outer surface of the mirror case which is enclosed by the cover member.
  • [0023]
    Alternatively or additionally one or more antennae may take the form of a conductive layer on part of the mounting for the mirror glass or other reflective member.
  • [0024]
    The mirror assembly may in addition incorporate other antennae for receiving GPS signals, remote operation of the car door locks and transponders for automatic road toll accounting systems. Some of these additional antennae may be formed as self-supporting rigid members.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6809692Oct 17, 2002Oct 26, 2004Advanced Automotive Antennas, S.L.Advanced multilevel antenna for motor vehicles
US7920097Aug 22, 2008Apr 5, 2011Fractus, S.A.Multiband antenna
US7932870Apr 26, 2011Fractus, S.A.Interlaced multiband antenna arrays
US8009111Mar 10, 2009Aug 30, 2011Fractus, S.A.Multilevel antennae
US8154462Feb 28, 2011Apr 10, 2012Fractus, S.A.Multilevel antennae
US8154463Mar 9, 2011Apr 10, 2012Fractus, S.A.Multilevel antennae
US8228245Oct 22, 2010Jul 24, 2012Fractus, S.A.Multiband antenna
US8228256Mar 10, 2011Jul 24, 2012Fractus, S.A.Interlaced multiband antenna arrays
US8330659Mar 2, 2012Dec 11, 2012Fractus, S.A.Multilevel antennae
US8723742Jun 26, 2012May 13, 2014Fractus, S.A.Multiband antenna
US8738103Dec 21, 2006May 27, 2014Fractus, S.A.Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US8896493Jun 22, 2012Nov 25, 2014Fractus, S.A.Interlaced multiband antenna arrays
US8941541Jan 2, 2013Jan 27, 2015Fractus, S.A.Multilevel antennae
US8976069Jan 2, 2013Mar 10, 2015Fractus, S.A.Multilevel antennae
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US9099773Apr 7, 2014Aug 4, 2015Fractus, S.A.Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US9240632Jun 27, 2013Jan 19, 2016Fractus, S.A.Multilevel antennae
US9331382Oct 3, 2013May 3, 2016Fractus, S.A.Space-filling miniature antennas
US9362617Aug 13, 2015Jun 7, 2016Fractus, S.A.Multilevel antennae
US20020140615 *Mar 18, 2002Oct 3, 2002Carles Puente BaliardaMultilevel antennae
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US20030112190 *Oct 17, 2002Jun 19, 2003Baliarda Carles PuenteAdvanced multilevel antenna for motor vehicles
US20040145526 *Oct 15, 2003Jul 29, 2004Carles Puente BaliardaDual-band dual-polarized antenna array
US20040257285 *Apr 13, 2004Dec 23, 2004Quintero Lllera RamiroMultiband antenna
US20050110688 *Oct 12, 2004May 26, 2005Baliarda Carles P.Multilevel antennae
US20050146481 *Nov 12, 2004Jul 7, 2005Baliarda Carles P.Interlaced multiband antenna arrays
US20050190106 *Apr 13, 2004Sep 1, 2005Jaume Anguera ProsMultifrequency microstrip patch antenna with parasitic coupled elements
US20050231427 *Jun 16, 2005Oct 20, 2005Carles Puente BaliardaSpace-filling miniature antennas
US20050259009 *Apr 8, 2005Nov 24, 2005Carles Puente BaliardaMultilevel antennae
US20060077101 *Apr 13, 2004Apr 13, 2006Carles Puente BaliardaLoaded antenna
US20060290573 *Jul 12, 2005Dec 28, 2006Carles Puente BaliardaMultilevel antennae
US20070132658 *Feb 6, 2007Jun 14, 2007Ramiro Quintero IlleraMultiband antenna
US20090167625 *Mar 10, 2009Jul 2, 2009Fractus, S.A.Multilevel antennae
US20090237316 *Apr 24, 2009Sep 24, 2009Carles Puente BaliardaLoaded antenna
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Classifications
U.S. Classification343/713, 343/711
International ClassificationB60R11/02, B60R1/06, H01Q1/22, H01Q1/32, B60R1/12
Cooperative ClassificationB60R2001/1261, B60R1/12
European ClassificationB60R1/12
Legal Events
DateCodeEventDescription
Jul 2, 2002CCCertificate of correction
Sep 27, 2005FPAYFee payment
Year of fee payment: 4
Oct 23, 2009FPAYFee payment
Year of fee payment: 8
Jul 19, 2013ASAssignment
Owner name: SMR PATENTS S.A.R.L, LUXEMBOURG
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DUROUX, DOMINIQUE MARGUERITE SUZANNE;DUROUX, CLOTILDE SIMONE ANDREE;SIGNING DATES FROM 20130408 TO 20130418;REEL/FRAME:030839/0133
Oct 24, 2013FPAYFee payment
Year of fee payment: 12