PatentDe  


Dokumentenidentifikation EP1642176 25.01.2007
EP-Veröffentlichungsnummer 0001642176
Titel ERDUNG VON EINER GEDRUCKTEN SCHALTUNG EINGESTELLT IN EINEN ARMBAND ELEKTRONISCHEN GERÄT
Anmelder Asulab S.A., Marin, CH
Erfinder ZELLWEGER, Emil, CH-4514 Lommiswil, CH;
ETIENNE, Jean-Daniel, CH-2206 Les Geneveys-sur-Coffrane, CH;
FERRI, Yvan, CH-1004 Lausanne, CH
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 602004003703
Vertragsstaaten AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IT, LI, LU, MC, NL, PL, PT, RO, SE, SI, SK, TR
Sprache des Dokument EN
EP-Anmeldetag 14.06.2004
EP-Aktenzeichen 047367511
WO-Anmeldetag 14.06.2004
PCT-Aktenzeichen PCT/EP2004/051108
WO-Veröffentlichungsnummer 2004114029
WO-Veröffentlichungsdatum 29.12.2004
EP-Offenlegungsdatum 05.04.2006
EP date of grant 13.12.2006
Veröffentlichungstag im Patentblatt 25.01.2007
IPC-Hauptklasse G04G 1/06(2006.01)A, F, I, 20060524, B, H, EP
IPC-Nebenklasse H01Q 1/27(2006.01)A, L, I, 20060524, B, H, EP   

Beschreibung[en]
FIELD OF THE INVENTION

The present invention concerns generally the electric connection of an electronic module in a portable instrument. More specifically, the present invention concerns an electronic instrument worn on the wrist including a case at least one part of which is electrically conductive and in which are housed an electronic module including a printed circuit board and an electric power source for powering the electronic module. In particular, the invention relates to an electronic instrument of this type also including an antenna provided with an ground plane.

BACKGROUND OF THE INVENTION

Electronic instruments worn on the wrist taking a form similar to that of a wristwatch are already known. Specific examples of such electronic instruments answering the aforementioned definition are also known.

European Patent No. 1 274 150 A1 proposes, for example, a portable electronic instrument able to take the form of a wristwatch and a part of whose case can be made of an electrically conductive metal material, this electronic instrument also including an antenna for receiving satellite positioning signals. According to this solution, the electronic module does not lie directly in the electrically conductive part of the case, but inside an assembly made of plastic material, the electronic module being supplied with electric power by the electric power source in a conventional manner via conductive contact strips or flanges. It should also be noted that the antenna (a micro-strip - or patch antenna - including a radiating element separated from a ground plane by a dielectric) lies on an element forming a bezel fitted onto the case and made of a dielectric material.

The articles entitled ("GPS Watch - Une montre à quartz analogique équipée d'un récepteur GPS à très faible consommation" (European Chronometry Congress, CEC 2000, Session 7, Communication 19, Geneva, 28 and 29 September 2000) and "GPS Watch - An analogue watch including a very low power GPS receiver" (ION GPS 2000 Conference, Salt Lake City, UT, USA, September 19-22,2000) in the name of P.-A. Farine and consorts, Asulab S.A., also describe an electronic instrument taking the form of a wristwatch including a case in which are housed an electric power source, an electronic module carrying in particular a micro-strip antenna and a satellite positioning receiver, as well as an analogue and digital display device. A part of the case, in this case a back cover-middle part, can also be made of an electrically conductive metal material, a non metal bezel being, however, fitted onto the top part of the instrument above the antenna. Like the solution disclosed in the aforementioned EP Patent No. 1 274150 A1, the electronic module is powered by the electric power source via conductive contact strips or flanges. According to this solution, it should be noted that the micro-strip antenna lies directly on the printed circuit board of the electronic module where its ground plane is made.

European Patent No. 1 134 837 A1, which discloses a portable electronic instrument including a so-called inverted L antenna or inverted F antenna because of its particular profile, should also be cited. The ground plane of this antenna is made on the top face of the printed circuit board of the electronic module. Insofar as the lateral and top parts of the case are made in one piece as illustrated in this document, the configuration of the instrument necessarily requires the use of a dielectric material to make the case in which the electronic module is housed. The electronic module is again powered by the electric power source by conductive contact strips or flanges. It should also be stressed that the electronic instrument has a back cover made of metallic material, which is electrically connected to a determined electric potential, in this case the positive potential of the electric power source. It is mentioned that this electric connection has the advantage of allowing the surface of the antenna ground plane to be increased, in particular via the body of the person wearing the instrument, which leads to increased sensitivity of the antenna.

Finally, US A 4 673 936 discloses a wristwatch including a metal case and in which are housed an electronic module including a printed circuit board and an electric power source for powering said electronic module, the watch further including an antenna provided with a ground plane, said printed circuit board having, at its periphery, a mechanical contact zone with said metal case.

In the aforementioned examples, it should thus be noted that the electronic module is conventionally powered by the electric power source via a set of conductive contact strips or flanges, electrically connecting the two electric poles of the power source to the sets of conductive supply paths typically made on the printed circuit board of the electronic module.

When one wishes to design an electronic instrument of the aforementioned type and fit it with a case at least part of which is electrically conductive, for example metal, it is known that it is also desirable to fix the electric potential of this conductive part rather than leave it floating. The electric potential of this electrically conductive part is thus often fixed by an electric connection to one of the poles of the electric power source, for example to the ground potential or the other supply potential. This electric connection is achieved either by directly connecting the part concerned to the corresponding pole of the power source, or again via conductive contact strips or flanges. By way of example, the European Patent No. 1134 837 A1 mentions that the connection of the metal back cover to the positive pole of the electric power source is achieved via contact strips.

The use of conductive contact strips or flanges to ensure the electric connection of the electronic module and/or a part of the case to the electric power source often constitutes a constraint, in particular when the portable instrument is being assembled. It is an object of the present invention to propose a solution simplifying to a certain extent the manufacture of these electric connections as well as the operations for assembling the instrument.

Within the scope of the more specific embodiment wherein the instrument incorporates an antenna fitted with a ground plane, a solution is sought for increasing the sensitivity of the antenna by enlarging its ground plane via a simplified electric connection, the enlargement being located substantially in the plane containing the ground plane of the antenna. Owing to this latter feature, improvement in the sensitivity of the antenna is better in the case of the present invention than in the case of the prior art.

SUMMARY OF THE INVENTION

The present invention concerns a portable electronic instrument or device whose features are listed in the independent claim 1.

Thus, according to the invention, the printed circuit board has, at its periphery, a mechanical contact zone with the electrically conductive part of the case and includes a conductive path extending at the periphery of the printed circuit board, on the mechanical contact zone, in order to allow an electric contact to be established with the electrically conductive part of the case.

According to the invention, the conductive path extending at the periphery of the printed circuit board electrically connects the antenna's ground plane to the electrically conductive part of the case. This connection ensures an enlargement of the antenna's ground plane and an increase in the antenna's reception sensitivity.

According to a particularly advantageous variant, a conductive strip made of compressible material (preferably a conductive elastomer) is inserted, on the mechanical contact zone, between the electrically conductive part of the case and the conductive path. This conductive strip is preferably compressed between the conductive path and a shoulder arranged on the electrically conductive part of the case. Moreover, the instrument can include a support element exerting pressure on several points of the periphery of the printed circuit board where the conductive strip is compressed, in order to encourage good mechanical stability of the assembly as well as a good electric contact between the conductive part of the case and the electronic module.

Other advantageous variants form the subject of the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Other features and advantages of the present invention will appear more clearly upon reading the following detailed description of embodiments of the invention given solely by way of non-limiting examples and illustrated by the annexed drawings, in which:

  • Figure 1 shows an overall plan view of an electronic instrument worn on the wrist taking a similar form to that of a wristwatch and forming an embodiment of the invention;
  • - Figure 2 is a partial cross-section of the electronic instrument of Figure 1 along the line of cross-section A-A parallel to the 6 o'clock-12 o'clock axis of the instrument:
  • - Figure 3 is an enlarged view of the cross-section of Figure 2 at the mechanical contact zone between the periphery of the printed circuit board and the case:
  • - Figure 4 is another partial cross-section of the electronic instrument of Figure 1 along the line of cross-section B-B parallel to the 9 o'clock - 3 o'clock axis of the instrument: and
  • - Figure 5 is a plan view of the electronic instrument in which the top part of the instrument and a part of the display device have not been shown.

DETAILED DESCRIPTION

Figure 1 shows a plan view of an electronic instrument or device, designated as a whole by the reference numeral 1, according to a first embodiment of the invention. This device advantageously takes the form of a wristwatch and is fitted with an antenna 20 (shown in dotted lines in Figure 1) electrically connected to an electronic module (reference 6 in Figures 2 and 3) housed inside electronic instrument 1. Within the scope of this embodiment, antenna 20 is intended to allow reception of radiofrequency signals transmitted by one or several remote transmission sources. More specifically, this antenna 20 is intended to allow reception of satellite positioning and navigation signals, such as the GPS signals originating from the American satellite positioning system NAVSTAR or other positioning signals originating from similar systems, such as the Russian GLONASS system or the future European satellite positioning and navigation system GALILEO.

Electronic instrument 1 has a general appearance similar to that of a conventional wristwatch and includes, in addition to antenna 20, a case 2, a wristband (not shown) attached to case 2, a glass 3 under which a display device 5 is arranged, enclosed in case 2, and control members (not shown). Display device 5 includes, in this case, an analogue display including two hands 51, 52 moving opposite a dial 53 (particularly allowing a conventional time display) completed by a digital display 55, for example a liquid crystal display. From the point of view of the display and user interface, this electronic instrument is comparable to that described in the two articles by P.-A. Farine and consorts mentioned in the description of the state of the art hereinbefore. In any case, the configuration shown in the Figures has to be considered purely illustrative and non-limiting.

Figure 2 shows a partial cross-section of the electronic instrument of Figure 1 taken along the cross-sectional line A-A parallel to the 6 o'clock -12 o'clock axis and passing through the centre of instrument 1. Case 2, glass 3, dial 53, facing which hands 51, 52 rotate and antenna 20, arranged under dial 53, are shown again. The electronic instrument further includes, as illustrated, an electronic module 6 including a printed circuit board 60 (preferably a multi-layered board) on which are mounted the various electronic and electric components of the instrument (including a motor designated 50 with its axes for driving hands 51, 52) as well as an electric power source 10 powering particularly electronic module 6 and display device 5. This electric power source 10 can be formed of a conventional battery, a rechargeable accumulator or any other suitable electric power source.

As illustrated in Figure 2, antenna 20 lies directly on the top face of printed circuit board 60 on the side of glass 3 and display device 5, under dial 53. Case 2 is formed in two parts, a first forming an external body or back-cover - middle part 4, and a second forming a bezel 7 which carries glass 3 and which is fitted onto external body 4. Because of the arrangement of antenna 20 inside case 2 in this example, bezel 7, dial 53 and hands 51, 52, which partly cover antenna 20, are made of a material that does not, so to speak, disturb the working of the antenna, such as a plastic material (hands 51, 52 can also be brought into angular positions where they no longer cover the antenna). External body 4 is made, by way of example, of an electrically conductive material, advantageously metal (for example steel or aluminium), or of a base material coated with an external electrically conductive layer.

In the illustration of Figure 2, it can be seen that printed circuit board 60 has, at its periphery, a mechanical contact zone with the electrically conductive part of case 2, namely with external body 4 in this example. More specifically, external body 4 includes a shoulder 40 on which printed circuit board 60 rests via its periphery.

In the embodiment shown in the Figures, antenna 20 is a micro-strip antenna (or patch antenna) of essentially parallelepiped shape, including a radiating element 21 separated from an ground plane 22 by a dielectric 25, for example made of ceramic material. The volume of antenna 20 is typically of the order of approximately 13 x 13 x 4 mm3. Radiating element 21 is formed of an essentially rectangular conductor element resting on the top part of dielectric 25. This radiating element 21 is conventionally connected to the electronic circuit via a conductor (not shown) passing through dielectric 25 to be connected to a corresponding path on printed circuit board 60. Ground plane 22 of the antenna is formed of a conductive surface (for example a metallisation) affixed to the top face of printed circuit board 60. The surface area of antenna ground plane 22 is typically greater than that of radiating element 21.

It is typically sought to maximise the surface area of ground plane 22, the area of said ground plane 22 being however limited by the presence of the electric and electronic components arranged in proximity to antenna 20 on electronic module 6. In the present case, motor 50 driving hands 51, 52 is arranged in proximity to antenna 20. In practice, it is thus impossible to make a ground plane of a size as large as desired without compromising on the dimensions of electronic instrument 1 as a whole. Given these constraints, an intermediate layer of multi-layered printed circuit board 60 is preferably used for arranging therein an additional ground layer that is connected to the other layers as well as to ground plane 22 of antenna 20, for example through metallised holes.

Figure 3 is an enlarged view of the cross-section of Figure 2 at the mechanical contact zone between the periphery of printed circuit board 60 and the electrically conductive part of case 2. In this view, a part of ground plane 22 of antenna 20 has been shown on the top face of printed circuit board 60 as well as a metallised hole 80 passing through the various layers (six in number here) of printed circuit board 60. It will be mentioned that a multitude of metallised holes is thus achieved on printed circuit board 60, not only to assure connections to ground, but also to assure electric connections between the electric and electronic components and the various paths of electronic module 6, which are arranged in the intermediate layers of printed circuit board 60. It should be noted that the size of metallised hole 80 and the thickness of the intermediate layers of printed circuit board 60 or the conductive layers are not shown to scale.

As illustrated in Figure 3, and added to Figure 2, a conductive path designated 65 is arranged on the bottom face of printed circuit board 60 and is electrically connected to ground plane 22 of antenna 20 via metallised holes 80 (or others distributed over electronic module 6). This conductive path 65 is arranged on the periphery of printed circuit board 60 and is particularly localised in the mechanical contact zone between printed circuit board 60 and shoulder 40 arranged on external body 4 of the case. This conductive path 65 extends preferably over essentially the entire periphery of printed circuit board 60, although it would be possible to envisage interrupting this conductive path 65 at one or several points of the periphery. Arranging path 65 over practically the entire periphery of the printed circuit board has the advantage of improving the quality of the electric contact with the electrically conductive part of case 2. Moreover, this solution contributes to improving the shielding of the components located, in this example, on the bottom face of electronic module 6 (for the sake of simplification, these components have not been shown in the Figures).

Alternatively, as regards the structure of case 2, external body 4 could be not entirely made of an electrically conductive material. In fact plastic materials could be used for the moulding then at least the contact zone could be coated with a conductive paint, so as to establish an electric connection between external body 4 and conductive path 65 carried by printed circuit board 60. Other appropriate structures could also be provided to assure the electrical connection function without departing from the scope of the present invention like, for example, an embodiment of the external body in two parts, namely a first part, substantially corresponding to a back cover, made of plastic material and a second part, substantially corresponding to a middle part, made of an electrically conductive material.

Generally, it is very convenient to arrange at least conductive path 65 in the region of printed circuit board 60 located substantially in the direct extension of the antenna's ground plane to improve the sensitivity of the antenna.

Preferably, as illustrated, an electrically conductive strip 45 made of a compressible material is inserted on the mechanical contact zone between the electrically conductive part of case 2 and conductive path 65. One could a priori envisage omitting this conductive path 45. The use of conductive strip 45 is however preferable in order to assure that the electric contact between path 65 and conductive external body 4 is of high quality and properly maintained. Conductive strip 45 can advantageously be made of a conductive elastomer shaped into a joint inserted between shoulder 40 and printed circuit board 60 or alternatively directly deposited on shoulder 40 before electronic module 6 is assembled.

In order to further improve the quality and strength of the mechanical and electric contact between electronic module 6 and the conductive part of case 2, it is also preferable to provide a support element exerting a pressure at several points of the periphery of printed circuit board 60 where electrically conductive strip 45 is compressed. As apparent from Figure 4, the embodiment illustrated includes such a support element designated by the reference numeral 70, which is placed on the top face of printed circuit board 60 under bezel 7. This support element 70 includes a base 75, which abuts on the periphery of printed circuit board 60 where conductive strip 45 is compressed. This base 75 allows the periphery of printed circuit board 60, which can typically have a relatively small thickness and thus a certain elasticity, to be rigidified.

Support element 70 can be simply inserted between electronic module 6 and bezel 7 and thus be applied against electronic module 6 or be directly secured to back cover - middle part 4, for example by being screwed in. Alternatively, it will also be understood that bezel 7 could be modified to act directly on the periphery of printed circuit board 60.

Figure 5 is a similar plan view to Figure 1 in which the top part of the instrument (bezel 7 and glass 3) as well as a part of display device 5 (hands 51, 52 and dial 53) has not been shown. Support element 70 and digital display 55 are partially illustrated in the left part of the Figure. In the right part of the Figure, motor 50 driving the hands can still be partially seen as well as a circuit 90 (for example a clockwork microcontroller) that is also mounted on the top part of printed circuit board 60 of electronic module 6. Antenna 20 is illustrated as well as its ground plane 22, whose larger surface area is indicated by the hatching. It will be noted that a recess is arranged in support element 70 to receive antenna 20.

Within the scope of the aforementioned example, it will thus have been understood that ground plane 22 of micro-strip antenna 20 is electrically connected via conductive path 65 directly to the electrically conductive part of case 2, namely back cover - middle part 4. This ensures an enlargement of the antenna's ground plane, in directions extending substantially in the extension of the antenna's ground plane, and thus an improvement in the detection sensitivity of the antenna. Tests carried out have demonstrated that a significant gain in sensitivity can be attained due to this connection to the electrically conductive part of the case.

As already mentioned in the preamble, a determined electric potential (ground potential or other) is typically applied to the electrically conductive parts of the case of such an electronic instrument worn on the wrist. The present invention ensures the application of such a determined electric potential to the electrically conductive part of the case via the conductive path arranged at the periphery of the printed circuit board, this conductive path being itself at desired electric potential. In such case, the electric potential of the electrically conductive part of the case is brought and established via the electronic module.

According to an alternative, it is possible to envisage using directly the electrically conductive part of the case to bring a determined electric potential to the electronic module. In particular, one of the poles of the electric power source could be directly connected, or also via a fuse, to the electrically conductive part of the case and be brought via the latter to the electronic module via the conductive path arranged at the periphery of the printed circuit board.

It will be understood generally that various modifications and/or improvements evident to those skilled in the art can be made to the embodiments described in the present description without departing from the scope of the invention defined by the annexed claims.

Specifically concerning the question of the antenna, it will also be noted that the invention is applicable to any type of antenna provided with a ground plane, including Planar Inverted-F or L Antennas (PIFA).


Anspruch[de]
Armbanduhr, die ein Gehäuse (2) umfasst, wovon wenigstens ein Teil elektrisch leitend ist und worin ein elektrisches Modul (6) untergebracht ist, das eine gedruckte Leiterplatte (60) und eine elektrische Leistungsquelle (10) für die Versorgung des elektrischen Moduls enthält, wobei die Armbanduhr ferner eine mit einer Masseebene (22) versehene Antenne (20) umfasst, wobei die gedruckte Leiterplatte (60) an ihrem Umfang eine Zone für einen mechanischen Kontakt mit dem elektrisch leitenden Teil (4) des Gehäuses (2) besitzt,

dadurch gekennzeichnet, dass die Antenne (20) und die Masseebene (22) auf der Oberseite der gedruckten Leiterplatte (60) angeordnet sind, wobei sich die Oberseite auf Seiten einer Anzeigevorrichtung (5) der Armbanduhr befindet, und dass die gedruckte Leiterplatte (60) eine Leiterbahn (65) enthält, die sich am Umfang der gedruckten Leiterplatte über die Zone für einen mechanischen Kontakt hinweg erstreckt und einen elektrischen Kontakt einerseits mit dem elektrisch leitenden Teil (4) des Gehäuses (2) und andererseits mit der Masseebene (22) herstellt, um so die Masseebene der Antenne (20) in Richtungen, die sich im Wesentlichen in der Erstreckung der Masseebene (22) erstrecken, zu vergrößern, wobei sich die Vergrößerung im Wesentlichen in der Ebene befindet, die die Masseebene (22) der Antenne (20) enthält.
Armbanduhr nach Anspruch 1, dadurch gekennzeichnet, dass die Antenne (20) eine Mikrostreifenantenne ist, die ein Strahlerelement (21) aufweist, das zu der Masseebene (22) im Wesentlichen parallel angeordnet ist. Armbanduhr nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass sie einen elektrisch leitenden Streifen (45) aufweist, der aus einem komprimierbaren Material hergestellt ist und in der Zone für einen mechanischen Kontakt zwischen das elektrisch leitende Teil (4) des Gehäuses (2) und die Leiterbahn (65) eingeschoben ist. Armbanduhr nach Anspruch 3, dadurch gekennzeichnet, dass der elektrisch leitende Streifen (45) zwischen dem leitenden Pfad (65) und einer Schulter (40), die auf dem elektrisch leitenden Teil (4) des Gehäuses (2) angeordnet ist, komprimiert ist. Armbanduhr nach Anspruch 4, dadurch gekennzeichnet, dass sie ferner ein Unterstützungselement (70, 75) aufweist, das an mehreren Punkten des Umfangs der gedruckten Leiterplatte (60), wo der elektrisch leitende Streifen (45) komprimiert wird, einen Druck ausübt. Armbanduhr nach Anspruch 3, dadurch gekennzeichnet, dass der elektrisch leitende Streifen (45) ein leitendes Elastomer ist. Armbanduhr nach Anspruch 1, dadurch gekennzeichnet, dass die Leiterbahn (65) auf einer ersten Seite der gedruckten Leiterplatte (60) angeordnet ist und mit anderen Leiterbahnen des elektrischen Moduls (6) durch metallisierte Löcher (80) elektrisch verbunden ist. Armbanduhr nach Anspruch 1, dadurch gekennzeichnet, dass der elektrisch leitende Teil (4) des Gehäuses (2) mit einem Pol eines bestimmten elektrischen Potentials der elektrischen Leistungsquelle (10) elektrisch verbunden ist, wobei der elektrisch leitende Teil (4) des Gehäuses (2) verwendet wird, um das bestimmte elektrische Potential über die Leiterbahn (65) an das elektronische Modul (6) anzulegen. Armbanduhr nach Anspruch 1, dadurch gekennzeichnet, dass der elektrisch leitende Teil (4) des Gehäuses (2) über die Leiterbahn (65) auf ein bestimmtes elektrisches Potential gebracht wird. Armbanduhr nach Anspruch 1, dadurch gekennzeichnet, dass sich die Leiterbahn (65) im Wesentlichen über den gesamten Umfang der gedruckten Leiterplatte (60) erstreckt. Armbanduhr nach Anspruch 1, dadurch gekennzeichnet, dass sich die Leiterbahn (65) wenigstens über einen Teil des Umfangs der gedruckten Leiterplatte (60), der sich in der Nähe der Masseebene (22) befindet, erstreckt.
Anspruch[en]
Wristwatch including a case (2) at least one part of which is electrically conductive and in which are housed an electronic module (6) including a printed circuit board (60) and an electric power source (10) for powering said electronic module, said wristwatch further including an antenna (20) provided with a ground plane (22), said printed circuit board (60) having, at its periphery, a mechanical contact zone with said electrically conductive part (4) of the case (2),

characterized in that the antenna (20) and the ground plane (22) are arranged on the top face of said printed circuit board (60), said top face being arranged on the side of a display device (5) of the wristwatch, and in that said printed circuit board (60) includes a conductive path (65) extending at the periphery of said printed circuit board, over said mechanical contact zone, and establishing an electric contact, on the one hand, with said electrically conductive part (4) of the case (2) and, on the other hand, with said ground plane (22) so as to enlarge the ground plane of said antenna (20) in directions extending substantially in the extension of said ground plane (22), the enlargement being located substantially in the plane containing the ground plane (22) of the antenna (20).
Wristwatch according to claim 1, characterized in that said antenna (20) is a micro-strip antenna including a radiating element (21) arranged substantially parallel to said ground plane (22). Wristwatch according to any of claims 1 or 2, characterized in that it includes an electrically conductive strip (45) made of compressible material that is inserted, on said mechanical contact zone, between said electrically conductive part (4) of the case (2) and said conductive path (65). Wristwatch according to claim 3, characterized in that said electrically conductive strip (45) is compressed between said conductive path (65) and a shoulder (40) arranged on the electrically conductive part (4) of the case (2). Wristwatch according to claim 4, characterized in that it further includes a support element (70, 75) exerting a pressure at several points of the periphery of said printed circuit board (60) where said electrically conductive strip (45) is compressed. Wristwatch according to claim 3, characterized in that said electrically conductive strip (45) is a conductive elastomer. Wristwatch according to claim 1, characterized in that said conductive path (65) is arranged on a first face of the printed circuit board (60) and is electrically connected to other conductive paths of the electronic module (6) via metallised holes (80). Wristwatch according to claim 1, characterized in that said electrically conductive part (4) of the case (2) is electrically connected to a pole of determined electric potential of the electric power source (10), said electrically conductive part (4) of the case (2) being used to bring said determined electric potential to said electronic module (6) via said conductive path (65). Wristwatch according to claim 1, characterized in that said electrically conductive part (4) of the case (2) is brought to a determined electric potential via said conductive path (65). Wristwatch according to claim 1, characterized in that said conductive path (65) extends over substantially the entire periphery of the printed circuit board (60). Wristwatch according to claim 1, characterized in that said conductive path (65) extends over at least a part of the periphery of the printed circuit board (60) located in proximity to said ground plane (22).
Anspruch[fr]
Montre-bracelet comprenant une boîte (2) dont une partie au moins est électriquement conductrice et dans laquelle sont logés un module électronique (6) comprenant une plaquette de circuit imprimé (60) et une source d'énergie électrique (10) pour alimenter ledit module électronique, ladite montre-bracelet comportant en outre une antenne (20) munie d'un plan de masse (22), ladite plaquette de circuit imprimé (60) présentant, en périphérie, une zone de contact mécanique avec ladite partie électriquement conductrice (4) de la boîte (2),

caractérisée en ce que l'antenne (20) et le plan de masse (22) sont agencés sur la face supérieure de ladite plaquette de circuit imprimé (60), ladite face supérieure étant agencée du côté d'un dispositif d'affichage (5) de la montre-bracelet, et en ce que ladite plaquette de circuit imprimé (60) comporte une piste conductrice (65) s'étendant en périphérie de ladite plaquette de circuit imprimé, sur ladite zone de contact mécanique, et établissant un contact électrique, d'une part, avec ladite partie électriquement conductrice (4) de la boîte (2) et, d'autre part, avec ledit plan de masse (22) de manière à élargir le plan de masse de ladite antenne (20) dans des directions s'étendant sensiblement dans le prolongement dudit plan de masse (22), l'élargissement étant situé sensiblement dans le plan contenant le plan de masse (22) de l'antenne (20).
Montre-bracelet selon la revendication 1, caractérisée en ce que ladite antenne (20) est une antenne microruban comprenant un élément radiant (21) disposé sensiblement parallèlement au dit plan de masse (22). Montre-bracelet selon l'une des revendications 1 ou 2, caractérisée en ce qu'elle comporte un ruban électriquement conducteur (45) en matériau compressible qui est interposé, sur ladite zone de contact mécanique, entre ladite partie électriquement conductrice (4) de la boîte (2) et ladite piste conductrice (65). Montre-bracelet selon la revendication 3, caractérisée en ce que ledit ruban électriquement conducteur (45) est comprimé entre ladite piste conductrice (65) et un épaulement (40) ménagé sur la partie électriquement conductrice (4) de la boîte (2). Montre-bracelet selon la revendication 4, caractérisée en ce qu'elle comporte en outre un élément de support (70, 75) exerçant un appui en plusieurs points de la périphérie de ladite plaquette de circuit imprimé (60) où est comprimé ledit ruban électriquement conducteur (45). Montre-bracelet selon la revendication 3, caractérisée en ce que ledit ruban électriquement conducteur (45) est un élastomère conducteur. Montre-bracelet selon la revendication 1, caractérisée en ce que ladite piste conductrice (65) est disposée sur une première face de la plaquette de circuit imprimé (60) et est reliée électriquement à d'autres pistes conductrices du module électronique (6) par le biais de trous métallisés (80). Montre-bracelet selon la revendication 1, caractérisée en ce que ladite partie électriquement conductrice (4) de la boîte (2) est reliée électriquement à un pôle de potentiel électrique déterminé de la source d'énergie électrique (10), ladite partie électriquement conductrice (4) de la boîte (2) servant à amener ledit potentiel électrique déterminé sur ledit module électronique (6) par l'intermédiaire de ladite piste conductrice (65). Montre-bracelet selon la revendication 1, caractérisée en ce que ladite partie électriquement conductrice (4) de la boîte (2) est amenée à un potentiel électrique déterminé par l'intermédiaire de ladite piste conductrice (65). Montre-bracelet selon la revendication 1, caractérisée en ce que ladite piste conductrice (65) s'étend sur sensiblement toute la périphérie de la plaquette de circuit imprimé (60). Montre-bracelet selon la revendication 1, caractérisée en ce que ladite piste conductrice (65) s'étend au moins sur une partie de la périphérie de la plaquette de circuit imprimé (60) située à proximité dudit plan de masse (22).






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