US20020000942A1 - Vehicle exterior mirror with antenna - Google Patents

Vehicle exterior mirror with antenna Download PDF

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Publication number
US20020000942A1
US20020000942A1 US09/843,474 US84347401A US2002000942A1 US 20020000942 A1 US20020000942 A1 US 20020000942A1 US 84347401 A US84347401 A US 84347401A US 2002000942 A1 US2002000942 A1 US 2002000942A1
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United States
Prior art keywords
rear view
view mirror
mirror according
case
antenna
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Granted
Application number
US09/843,474
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US6380902B2 (en
Inventor
Bernard Duroux
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SMR Patents SARL
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Bernard Duroux
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Priority to US09/843,474 priority Critical patent/US6380902B2/en
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Publication of US6380902B2 publication Critical patent/US6380902B2/en
Assigned to SMR PATENTS S.A.R.L reassignment SMR PATENTS S.A.R.L ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DUROUX, CLOTILDE SIMONE ANDREE, DUROUX, DOMINIQUE MARGUERITE SUZANNE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/12—Mirror assemblies combined with other articles, e.g. clocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/12—Mirror assemblies combined with other articles, e.g. clocks
    • B60R2001/1261—Mirror assemblies combined with other articles, e.g. clocks with antennae

Definitions

  • 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.
  • 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.
  • the antenna comprises an electrically conductive layer on a surface of a rigid member forming part of the mirror assembly.
  • FIG. 1 is a perspective view of a vehicle exterior mirror in accordance with the invention
  • FIG. 2 is a perspective view of the case of the mirror shown in FIG. 1;
  • FIG. 3 is a perspective view of the mirror case shown in FIG. 2, from a different angle;
  • 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;
  • FIG. 5 is a cross-sectional view taken on the line 5 - 5 in FIG. 4;
  • FIG. 6 is a cross-sectional view taken on the line 6 - 6 in FIG. 4;
  • FIG. 7 is a diagram illustration dimensions of a theoretical conical antenna.
  • 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 .
  • 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.
  • a first metallic foil element 30 is secured by adhesive to the inside surface of the outboard end of the case 11 .
  • 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).
  • FIG. 7 shows a cone of half cone angle ⁇ and length ⁇ .
  • Theoretically ⁇ should be equal to wavelength ⁇ 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.
  • the length ⁇ of foil element may be about three tenths of the wavelength ⁇ .
  • 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).
  • 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).
  • the antennae 42 , 46 , 50 and 54 are rigid antennae mounted within the case 11 .
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

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.

Description

    RELATED APPLICATIONS
  • This application is a continuation of U.S. Ser. No. 09/404,101 filed Sep. 23, 1999.[0001]
    • FIELD
  • 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. [0002]
    • RELATED ART
  • 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. [0003]
    • SUMMARY OF THE INVENTION
  • 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.[0004]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a perspective view of a vehicle exterior mirror in accordance with the invention; [0005]
  • FIG. 2 is a perspective view of the case of the mirror shown in FIG. 1; [0006]
  • FIG. 3 is a perspective view of the mirror case shown in FIG. 2, from a different angle; [0007]
  • 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; [0008]
  • FIG. 5 is a cross-sectional view taken on the line [0009] 5-5 in FIG. 4;
  • FIG. 6 is a cross-sectional view taken on the line [0010] 6-6 in FIG. 4; and
  • FIG. 7 is a diagram illustration dimensions of a theoretical conical antenna.[0011]
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • FIG. 1 shows a vehicle rear-view mirror comprising a [0012] 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.
  • The theoretical formula for the feed-point impedance (Zk) of a conical antenna is:[0013]
  • Zk=(Zo/π)Ln cot g(θ/2)
  • 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. [0014]
  • 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. [0015] 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
  • It follows that the length └ of the [0016] foil elements 30 a and 30 b and the half-cone angle θ is:
  • (Zo/π)Ln Cot gθ/2=1500(└/λ)−113-3
  • In practice, the length └ of foil element may be about three tenths of the wavelength λ. [0017]
  • Two [0018] 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).
  • In addition to the above two antennae, a [0019] 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).
  • The [0020] 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.
  • Antennae comprising metal inserts moulded into the [0021] 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.
  • 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. [0022]
  • 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. [0023]
  • 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. [0024]

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.
US09/843,474 1998-09-23 2001-04-26 Vehicle exterior mirror with antenna Expired - Lifetime US6380902B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US09/843,474 US6380902B2 (en) 1998-09-23 2001-04-26 Vehicle exterior mirror with antenna

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB9820622.0 1998-09-23
GBGB9820622.0A GB9820622D0 (en) 1998-09-23 1998-09-23 Vehicle exterior mirror with antenna
GB9820622 1998-09-23
US09/404,101 US6259412B1 (en) 1998-09-23 1999-09-23 Vehicle exterior mirror with antenna
US09/843,474 US6380902B2 (en) 1998-09-23 2001-04-26 Vehicle exterior mirror with antenna

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US09/404,101 Continuation US6259412B1 (en) 1998-09-23 1999-09-23 Vehicle exterior mirror with antenna

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US20020000942A1 true US20020000942A1 (en) 2002-01-03
US6380902B2 US6380902B2 (en) 2002-04-30

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US09/404,101 Expired - Lifetime US6259412B1 (en) 1998-09-23 1999-09-23 Vehicle exterior mirror with antenna
US09/843,474 Expired - Lifetime US6380902B2 (en) 1998-09-23 2001-04-26 Vehicle exterior mirror with antenna

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US (2) US6259412B1 (en)
EP (1) EP0989028B1 (en)
JP (1) JP2000114842A (en)
DE (1) DE69935565T2 (en)
GB (1) GB9820622D0 (en)

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GB9820622D0 (en) 1998-11-18
US6380902B2 (en) 2002-04-30
EP0989028A2 (en) 2000-03-29
JP2000114842A (en) 2000-04-21
DE69935565T2 (en) 2007-12-27
EP0989028A3 (en) 2000-12-20
DE69935565D1 (en) 2007-05-03
US6259412B1 (en) 2001-07-10
EP0989028B1 (en) 2007-03-21

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