• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a housing wall (12) for a data communication device (1) with a metallic and electrically conductive body. According to the invention, a slot array (26) with a number of slots (21) is provided in a region of the housing wall (12), so that the housing wall (12) in the region of the slot field (26) for magnetic fields for inductive signal coupling for wireless communication is permeable.
    公开号:AT514622A1
    申请号:T50467/2013
    申请日:2013-07-24
    公开日:2015-02-15
    发明作者:Walter Ettel；Manfred Dipl Ing Bammer；Gernot Dipl Ing Schmid
    申请人:Seibersdorf Labor Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a housing wall for a data communication device and to a housing for a data communication device and to a housing equipped with a data communication device according to the preamble of patent claims 1, 9 and 10.
    Basically, data communication devices, such as e.g. Mobile telephones or RFiD readers that provide wireless data transmission based on inductive coupling between the data communication device and an external device, such as a mobile device. an NFC device or a transponder, make possible the problem that such data transmission by means of inductive coupling does not work through metallic or electrically highly conductive housings or objects or surfaces. For this reason, data communication devices such as mobile phones with metallic housings are generally not suitable to perform data transmission by means of inductive coupling with an external data communication device. This is due to counterinduction effects due to eddy currents induced in the metallic objects or areas of the data communication device. The electromagnetic alternating field generated by the transmitter induces eddy currents in the metallic housing of the data communication device which are directed counter to their cause and thus weaken the resulting magnetic field necessary for the data communication in such a way that data communication is not possible. Modern smartphones with an NFC interface therefore have a non-metallic housing or a non-metallic cover in the area of the NFC antenna, which is normally located on the back of the device.
    However, the use of metallic housings for data communication devices, in particular mobile phones, has many positive aspects and advantages over non-shielding plastic housings, especially with regard to stability and thermal conductivity.
    It is therefore an object of the invention to provide a housing wall for a data communication device, in particular a mobile phone, which is essentially metallic and has the stability and thermal conductivity of metal, but at the same time is permeable to inductive coupling based data transmission.
    The invention solves this problem in a housing wall of the type mentioned above with the characterizing features of claim 1.
    According to the invention, in the case of a housing wall for a data communication device with a metallic and electrically conductive base body, a slot array with a number of slots is provided in an area of the housing wall so that the housing wall in the area of the slot field is permeable to magnetic fields for inductive signal coupling for wireless communication , This provides a simple way to create a data communication between an arranged in the housing wall antenna and a data communication device arranged on the opposite side such as a transponder, while the advantages of a metallic housing such as the high stability or low susceptibility continue to exist ,
    In order to further improve this effect, it can be provided that the slots restrict a free propagation of the eddy currents induced in the housing wall by the magnetic field generated by a magnetic field applied to the housing wall or close to the housing in the region of the slot field such that a based on inductive coupling wireless communication between the coil antenna and a located on the opposite side of the housing wall further data communication device is possible.
    In order to additionally avoid water or gas entering or passing, it can be provided that the housing wall is closed in the region of the contactor field with electrically non-conductive material, and in particular has an insulating layer which covers and closes the contactors, in particular the contactor field of Housing wall is impermeable to air or water.
    An advantageous data communication through the housing wall is achieved if a coil antenna is arranged on one of its sides in the region of the slot field
    In order to further prevent a shielding of the magnetic field emitted by an antenna, it may be provided that the slot field projects beyond the coil antenna.
    An advantageous suppression of the mutual induction is achieved when the webs formed between the slots have a width of at most 3 mm.
    An arrangement with increased mechanical stability provides that the housing wall is constructed of at least two layers and has at least a first layer and a second layer, each having overlapping slot areas with slots, the slots being offset from one another in the slot area.
    In order to simultaneously achieve a high mechanical stability and a low suppression of the magnetic field delivered, it can be provided that between the first layer and the second layer, an insulating layer is formed, which spaced the two layers to each other and electrically insulated from each other.
    The mechanical stability can be further improved by including the slots of the first layer and the slots of the second layer at angles of more than 45 °, in particular more than 85 °.
    The invention further relates to a housing for a data communication device comprising a housing wall according to one of the preceding claims and a coil antenna arranged in the interior of the housing in the region of the slot field.
    Furthermore, the invention relates to a data communication device, in particular a mobile telephone, with a housing according to claim 9.
    Several embodiments of the invention are illustrated by the following drawing figures.
    Fig. 1 shows a mobile telephone with a metallic housing according to the prior art, in Fig. 2 is a section through the mobile phone shown in Fig. 1 is shown. Fig. 3 shows the formation of eddy currents in a fully metallic housing wall. Fig. 4 shows the formation of eddy currents in a preferred housing wall according to the invention. FIGS. 5 to 8 show preferred housing walls according to the invention. 9 and 10 show preferred developments of the housing wall shown in Fig. 5 in cross section. Fig. 11 to 13 show preferred two-layer housing walls. 14 and 15 show a further two-layered embodiment of a housing wall in front view and in section. Fig. 16 shows a further advantageous embodiment of a housing wall, in which the slot field is used as a design element.
    Fig. 1 shows a mobile telephone with a metallic housing according to the prior art. In the present example, the mobile phone 1 has two housing parts 11, 12, namely a trough-like housing part 11 and a flat housing part 12 which, when assembled, enclose and shield the electronics 14 (FIG. 2) of the mobile telephone.
    Furthermore, FIG. 1 shows an NFC antenna 13, which is connected to the electronics 14 of the mobile device and lies inside the housing of the mobile telephone 1 formed by the two housing parts 11, 12.
    As shown in Fig. 2, an electromagnetic field is generated by the antenna 13. The dashed arrows 15 represent that electromagnetic field that arises without the metallic shielding of the housing wall 12. The dotted arrows 16 show the electromagnetic field produced by eddy currents 17, which are induced in the housing wall 12. As a result of the superimposition of the two magnetic fields 15, 16, a resulting magnetic field 18 results which is greatly attenuated in comparison with the original magnetic field 15. The range and strength of the magnetic field or data transmission, which is possible by means of NFC starting from the mobile phone 1, is therefore significantly reduced.
    In order to achieve the objective of a resulting magnetic field sufficient for inductive communication outside the cellular phone body, the formation of the eddy current induction can be suppressed. Reducing the electrical conductivity of the backplane material is not possible with currently technically available materials without at the same time losing many (thermal) benefits of a metallic backplane.
    In Fig. 3, the effect of the current displacement in the housing wall 12 of the mobile phone 1 shown in Figures 1, and 2 is shown in more detail. It should be noted that, due to the effect of current displacement, the eddy currents that form are concentrated along the edge of the metal surface interspersed with the magnetic field.
    A sufficient suppression of eddy current induction can be achieved, however, if the flat structure of the metallic housing 11, 12, at least in the region of the inductive antenna 13 is designed so that eddy currents 17 can no longer or only to a very limited extent form therein. The easiest way to do this is by the design of slots 21 in the metallic housing wall 11 in the region of the antenna 13, as shown in Fig. 4, possible. These slots 21 can be arbitrarily thin, it only needs to a sufficient increase in ohmic
    Resistance come in the transverse direction to the slots, as dargestelit in Fig. 4 is dargestelit.
    Due to the slits in the metal, the induced eddy currents 17 can not propagate unhindered (FIGS. 3 and 4). Of course, it comes in the individual webs 22 between the slots 21 for eddy current induction. Due to the comparatively small web width a, current paths through which flow is in the opposite direction are close to one another and compensate each other with regard to the mutual induction effect of the eddy currents. By selecting a small web width a, the mutual induction effect is further weakened. The housing wall 12 is all the more permeable to the magnetic field generated by the antenna 13, the smaller the land width a is selected.
    If the portion of a metallic device housing covering the coil antenna 13 is provided with slots 21 as shown above, the magnetic field generated by the coil antenna 13 is no longer attenuated, so that wireless communication through inductive coupling through the metal housing 12 is possible through.
    Since the slot width b can be made very small without reducing the desired effect, it is also possible, for example, by coating the housing wall 12 with electrically non-electrically capable materials, a waterproof, or substantially airtight cover (Fig. 9) despite the Slots 21 to achieve. In this case, an electrically non-conductive material applied to the housing wall 12 bridges the slots 21, which each have only a very small slot width b.
    5 shows examples of slot fields 26 arranged in housing walls 12, which allow an inductive coupling through the housing wall 12. The slots 21 are each shown only as dashes.
    FIGS. 9 and 10 show preferred embodiments of the invention, which show a cross-section of the housing wall 12 along the cut edge B-B of FIG. 5. It is particularly advantageous in this case to fill the housing wall 12 provided with slots 21 with an insulating layer 25 with electrically or magnetically nonconductive material. In this case, either the webs 21 can be filled with an insulating layer 25 of electrically non-conductive material 25. However, as shown in FIGS. 9, 10, only one additional insulating layer 25 with non-conductive material may be provided which prevents the penetration of the housing wall 12 of water or gases.
    A metaische device housing wall 12 with slots 21 has in practice worse mechanical properties, such as lower bending stiffness, and inferior radio technical properties in the UHF or microwave range. The latter is mainly caused by the fact that slots 21 in metal structures can act very efficiently as antennas if the length of the slots 21 is in the range of the wavelength. For the frequency bands used by modern mobile phones 1 from a few hundred MHz to several GHz, this could therefore be the case, whereby the radio technology properties of the mobile phones 1 are adversely affected by the contactors 21 in the device housing under certain circumstances.
    Both mentioned potential disadvantages of the contactors 21 in the device housing 11, 12, namely possible influences on the mechanical and radio technical properties, but can be sufficiently mitigated by the considered housing wall 12 or the considered area of the housing wall 12 of two layers 23, 24 mutually electrically isolated slotted Metal are constructed, the contactors 21 of the two layers 23, 24 are arranged offset from one another. In order to achieve a similar bending stiffness as unprotected metal, an orthogonal displacement with non-positive electrically non-capable connection, in particular bonding, proves to be expedient. However, this is not absolutely necessary for the magnetic transparency of the housing wall 12.
    FIGS. 11 to 13 show examples of housing threads 12 with arrangements of two metal layers arranged one above the other, but electrically insulated from one another, which sufficiently suppress a mutual induction effect and thus permit inductive communication through the housing wall 12. 11 to 13, several embodiments of housing walls 12 are shown with two-layer slot fields, wherein in the first layer 23 (Fig, 15) the dashed dargesteilten slots 21a and in the second layer 24 (Fig. 15) shown in phantom slots 21b available.
    The antenna effect caused by contactors 21 can be suppressed, in particular in the UHF and microwave range, with two layers 23, 24 of slotted mutually electrically insulated metal layers in an arrangement according to FIGS. 14 and 15.
    Fig. 14 shows such an embodiment, wherein Fig. 15 shows a section C-C in Fig. 14. Here, an insulating layer 25 is shown, which isolates the two layers 23, 24 to each other and prevents the ingress of liquids through the housing wall 12.
    Typical antennas 13 are designed for inductive data transmission in the frequency range between 10 kHz and 100 MHz, in particular 120-135 kHz, 13-14 MHz, 25-30 MHz.
    The mutual induction effect is locally influenced above all by the web widths a or slot spacings. The smaller the ridge widths a, the better the mutual induction effect is suppressed, in practice ridge widths a with at most 3 mm make sense. For unrestricted operation of the inductive data communication, whereby communication with all transponder sizes is possible, as would be the case in the case of a non-metallic housing, the dimensions of the slot array 26, in particular the rectangular area of size Schiitzfeldiänge x slot array width, are greater than that Outside dimensions of the coil antenna 13 set. The slot array 26 projects beyond the coil antenna 13. If the slot array 26 is smaller than the outer dimensions of the coil antenna 13 of the mobile telephone, at least one communication with transponders whose transponder antenna is smaller than the slot array 26 is possible.
    Of course, it is also possible to design the slot array 26 so that it simultaneously fulfills advertising or brand identity or marketing purposes (FIG. 16).
    权利要求:
    Claims (10)
    [1]
    1. housing wall (12) for a data communication device (1) with a metallic and electrically conductive base body, characterized in that in a region of the housing wall (12) a slot array (26) with a number of shooters (21) is provided such that the housing wall (12) in the area of the protective field (26) is permeable to magnetic fields for inductive signal coupling for wireless communication,
    [2]
    2. housing wall (12) according to claim 1, characterized in that the slots (21) a free propagation of the one of the in the region of the slot array (26) located on the housing wall (12) adjacent or close to the housing (12) lying coil antenna (13) generated magnetic field induced eddy currents (17) in the housing wall (12) such that a based on inductive coupling wireless communication between the coil antenna (13) and on the opposite side of the housing wall (12) located further data communication device possible is.
    [3]
    3. Housing wall (12) according to claim 1 or 2, characterized in that the housing wall (12) in the region of the slot field (26) is closed with electrically non-conductive material, and in particular an insulating layer (25) having the slots (21). covers and closes, in particular, the slot field (26) of the housing wall (12) is impermeable to air or water.
    [4]
    4. housing wall (12) according to any one of the preceding claims, characterized in that on one of its sides in the region of the Schiitzfelds (26) a coil antenna (13) is arranged, in particular the slot array (26) projects beyond the coil antenna (13).
    [5]
    5. housing wall (12) according to one of the preceding claims, characterized in that between the slots (21) formed webs (22) have a width of at most 3 mm.
    [6]
    6. housing wall (12) according to any one of the preceding claims, characterized in that the housing wall is constructed of at least two layers and at least a first layer (23) and a second layer (24), each overlapping slot portions (26) with slots (21a , 21b), wherein the slots (21a, 21b) are arranged offset in the slot area (26) against each other.
    [7]
    7. housing wall (12) according to claim 6, characterized in that between the first layer (23) and the second layer (24) an insulating layer (25) is formed, the two layers (23, 24) spaced from each other and against each other electrically isolated.
    [8]
    8. housing wall (12) according to claim 6 or 7, characterized in that the slots (21a) of the first layer (23) and the slots (21b) of the second layer (21b) to each other angle of more than 45 °, in particular more as 85 °, include.
    [9]
    9. Housing (11, 12) for a data communication device (1) comprising a housing wall (12) according to one of the preceding claims and a in the interior of the housing (11, 12) arranged in the region of the slot array (26) arranged coil antenna (13) ,
    [10]
    10. Data communication device, in particular a mobile telephone (1), with a housing (11, 12) according to claim 9.
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    引用文献:
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    FR2803482A1|2000-01-05|2001-07-06|Diffusion Vente Internationale|ELECTRONIC KEY READER|
    US6724690B1|2001-07-25|2004-04-20|Mitsubishi Materials Corporation|Wrist watch containing tag|
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    EP2562868A1|2011-08-22|2013-02-27|Laird Technologies AB|A multiple-turn loop antenna arrangement and a portable radio communication device comprising such an arrangement|
    CN202748817U|2011-11-30|2013-02-20|北京物资学院|Spiral radio frequency identification tag capable of directional reception|AT519728A1|2017-03-09|2018-09-15|Seibersdorf Labor Gmbh|Deactivatable shielding element|DE19747562C2|1997-10-28|2000-09-28|Siemens Ag|Method and arrangement for controlling the propagation of magnetic fields by means of electrodynamic / magnetic converters, in particular in telecommunication devices|
    KR101501921B1|2008-05-06|2015-03-13|삼성전자주식회사|antenna structure for potable terminal having metal case|
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    KR101887891B1|2016-02-17|2018-08-13|주식회사 아모센스|back cover for portable device and antenna module embeded in back cover|
    WO2018028486A1|2016-08-08|2018-02-15|Guangdong Oppo Mobile Telecommunications Corp., Ltd.|Housing, method for manufacturing housing, and mobile terminal having housing|
    法律状态:
    2021-03-15| MM01| Lapse because of not paying annual fees|Effective date: 20200724 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50467/2013A|AT514622B1|2013-07-24|2013-07-24|housing wall|ATA50467/2013A| AT514622B1|2013-07-24|2013-07-24|housing wall|
    US14/907,194| US9756155B2|2013-07-24|2014-07-04|Housing wall|
    EP14747291.4A| EP2941861B1|2013-07-24|2014-07-04|Housing wall|
    PCT/AT2014/050154| WO2015010147A1|2013-07-24|2014-07-04|Housing wall|
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