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WO2003034537A1 - Mobile radiotelephone apparatus comprising a correction element reducing specific absorption rate - Google Patents

Mobile radiotelephone apparatus comprising a correction element reducing specific absorption rate Download PDF

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Publication number
WO2003034537A1
WO2003034537A1 PCT/DE2002/003813 DE0203813W WO03034537A1 WO 2003034537 A1 WO2003034537 A1 WO 2003034537A1 DE 0203813 W DE0203813 W DE 0203813W WO 03034537 A1 WO03034537 A1 WO 03034537A1
Authority
WO
WIPO (PCT)
Prior art keywords
mobile radio
keyboard
absorption rate
mobile radiotelephone
specific absorption
Prior art date
Application number
PCT/DE2002/003813
Other languages
German (de)
French (fr)
Inventor
Thorsten Kowalski
Stefan Huber
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP02774449A priority Critical patent/EP1435124A1/en
Publication of WO2003034537A1 publication Critical patent/WO2003034537A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
    • H04B1/3833—Hand-held transceivers
    • H04B1/3838—Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/245—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/526—Electromagnetic shields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/002—Materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/024—Properties of the substrate
    • H01H2209/026—Properties of the substrate metallic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2231/00—Applications
    • H01H2231/022—Telephone handset
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/004—High frequency adaptation or shielding

Definitions

  • the present invention relates to a mobile radio device, in particular a mobile radio telephone, with a housing and a keyboard provided in the top of the housing, which extends essentially in the area of the center of the device.
  • SAR Specific Absorption Rate
  • This value indicates the specific absorption rate in watts per kilogram, with which a given tissue volume range, e.g. B. is thermally stressed in the head of the respective user of the mobile device.
  • One type of protective measure is e.g. B. is known from EP 0 603 081 AI, in which an electro-magnetically absorbing shielding plate is housed between the most radiating zone of the mobile radio telephone and the head of the respective user as a kind of radiation-blocking partition in the housing of the mobile radio telephone.
  • a protective measure requires an additional element or several additional elements, which makes the manufacture of the mobile radio device more complicated and expensive.
  • the object of the present invention is to provide a mobile radio device of the type mentioned at the beginning, in which there is adequate protection against electrical without additional components. magnetic radiation is given to the respective user.
  • the keyboard has, inter alia, a keyboard mat which consists of an electrically conductive and / or magnetically and / or dielectrically active material.
  • This type of protective measure is therefore very effective for reducing the exposure dose to electromagnetic radiation, since the location of the strongest radiation of the electromagnetic field and thus the cause of a high SAR value in the current length of the mobile radio devices, which are likely to remain in the future is located in the area of the center of the device on the device board, which acts as the opposite pole to the actual antenna.
  • the energy radiated into the human tissue can be reduced on the one hand and the performance of the antenna can be improved or kept constant by reflection.
  • the SAR value can be easily reduced.
  • the figure shows a perspective exploded view of a mobile radio device in which the invention is used.
  • the mobile phone consists essentially of the upper shell 1 and the lower shell 2, wherein there is a battery compartment for the battery 3 in the lower shell 2 and the battery compartment is closed by means of the cover 4.
  • the cover 4 In the upper shell there is, among other things, the display with the display cover 5 and the keyboard 6.
  • a component of the keyboard 6 is the keyboard mat 7.
  • This keyboard mat 7 extends at least partially in the area of the center of the device and additionally serves to reduce the exposure dose to electromagnetic radiation for the respective user whose head is on the keyboard and display side of the mobile radio telephone when using the mobile radio telephone.
  • the location with the greatest electromagnetic radiation is located on the board below the keyboard mat 7, so that the keyboard mat 7 is located between the head of the user and the location with the greatest electromagnetic radiation from the mobile radio telephone.
  • this keyboard mat is now either made of an electrically conductive material and / or a magnetically active and / or a dielectric material. posed.
  • the radiated energy ie the energy radiated into the tissue of the user's head, is considerably reduced.
  • the magnetic materials prefferably have a relative permeability ⁇ r which is greater than 1 and for the dielectrically active materials to have a relative dielectric constant ⁇ r which is greater than 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)

Abstract

The invention concerns a mobile radiotelephone apparatus comprising a housing and a keypad in the upper part of the housing, said keypad substantially extending in the central zone of the apparatus. To reduce harmful electromagnetic radiation, said keypad comprises among others a support shielding made of an electrically conductive and/or magnetic and/or dielectric material.

Description

Beschreibungdescription
Mobilfunkgerät mit einem den SAR-Wert reduzierenden KorrekturelementMobile radio device with a correction element that reduces the SAR value
Die vorliegende Erfindung betrifft ein Mobilfunkgerät, insbesondere Mobilfunktelefon, mit einem Gehäuse und einer in der Oberseite des Gehäuses vorgesehenen Tastatur, die sich im Wesentlichen im Bereich der Gerätemitte erstreckt.The present invention relates to a mobile radio device, in particular a mobile radio telephone, with a housing and a keyboard provided in the top of the housing, which extends essentially in the area of the center of the device.
Bei Mobilfunkgeräten ist es wünschenswert, die Belastungsdosis an elektromagnetischer Strahlung für den jeweiligen Benutzer möglichst klein zu halten, um potentielle Gesundheitsrisiken möglichst zu vermeiden.With mobile radio devices, it is desirable to keep the exposure dose to electromagnetic radiation as small as possible for the respective user in order to avoid potential health risks as far as possible.
Als ein spezifisches Meßkriterium dafür, welchen Strahlungsbelastungen der jeweilige Benutzer tatsächlich ausgesetzt ist, wird der sogenannte SAR-Wert (Specific Absorption Rate) verwendet. Dieser Wert gibt die spezifische Absorbtionsrate in Watt pro Kilogramm an, mit der ein vorgegebener Gewebevolumenbereich, z. B. im Kopf des jeweiligen Benutzers des Mobilfunkgeräts, thermisch belastet wird.The so-called SAR (Specific Absorption Rate) is used as a specific measurement criterion for which radiation exposure the respective user is actually exposed to. This value indicates the specific absorption rate in watts per kilogram, with which a given tissue volume range, e.g. B. is thermally stressed in the head of the respective user of the mobile device.
Um nun einen Benutzer beim Gebrauch des Mobilfunkgerätes vor potentiellen Gesundheitsgefährdungen durch die von Mobilfunkgerät abgegebene elektromagnetische Strahlungsenergie weitgehend zu schützen, sind in der Praxis eine Vielzahl von Vorsichtsmaßnahmen getroffen.In order to largely protect a user when using the mobile radio device against potential health hazards from the electromagnetic radiation energy emitted by the mobile radio device, a large number of precautionary measures have been taken in practice.
Eine Art für eine Schutzmaßnahme ist z. B. aus der EP 0 603 081 AI bekannt, bei der eine elektromagnatisch absorbierende Abschirmplatte zwischen der am stärksten strahlenden Zone des Mobilfunktelefons und dem Kopf des jeweiligen Benutzers als eine Art Strahlungsblockierende Zwischenwand im Gehäuse des Mobilfunktelefons untergebracht ist. Eine derartige Schutzmaßnahme erfordert allerdings ein zusätzliches Element bzw. mehrere zusätzliche Elemente, wodurch die Herstellung des Mobilfunkgerätes komplizierter und teurer wird.One type of protective measure is e.g. B. is known from EP 0 603 081 AI, in which an electro-magnetically absorbing shielding plate is housed between the most radiating zone of the mobile radio telephone and the head of the respective user as a kind of radiation-blocking partition in the housing of the mobile radio telephone. However, such a protective measure requires an additional element or several additional elements, which makes the manufacture of the mobile radio device more complicated and expensive.
Aufgabe der vorliegenden Erfindung ist es, ein Mobilfunkgerät der eingangs genannten Art anzugeben, bei welchen ohne zusätzliche Bauelemente ein ausreichender Schutz gegen elektro-. magnetische Strahlung für den jeweiligen Benutzer gegeben ist.The object of the present invention is to provide a mobile radio device of the type mentioned at the beginning, in which there is adequate protection against electrical without additional components. magnetic radiation is given to the respective user.
Diese Aufgabe wird erfindungsgemäß für das eingangs angegebene Mobilfunkgerät dadurch gelöst, dass die Tastatur unter anderem eine Tastaturmatte aufweist, welche aus einem elekt- risch leitfähigen und/oder magnetisch und/oder dielektrisch wirksamen Material besteht.This object is achieved according to the invention for the mobile radio device specified at the outset in that the keyboard has, inter alia, a keyboard mat which consists of an electrically conductive and / or magnetically and / or dielectrically active material.
Diese Art der Schutzmaßnahme ist deshalb zur Herabsetzung der Belastungsdosis an elektromagnetischer Strahlung sehr wirk- sam, da der Ort der stärksten Abstrahlung des elektromagnetischen Feldes und somit die Ursache für einen hohen SAR-Wert bei der aktuellen Länge der Mobilfunkgeräte, welche wahrscheinlich in Zukunft auch beibehalten wird, im Bereich der Gerätemitte auf der Geräteplatine liegt, welche als Gegenpol zur eigentlichen Antenne wirkt.This type of protective measure is therefore very effective for reducing the exposure dose to electromagnetic radiation, since the location of the strongest radiation of the electromagnetic field and thus the cause of a high SAR value in the current length of the mobile radio devices, which are likely to remain in the future is located in the area of the center of the device on the device board, which acts as the opposite pole to the actual antenna.
Durch den Einsatz von elektrisch leitfähigen und/oder magnetischen und/oder dielektrisch wirksamen Materialien für die in der Mitte liegende Tastaturmatte kann einerseits die in das menschliche Gewebe eingestrahlte Energie vermindert werden und andererseits kann durch Reflektion die Performance der Antenne verbessert bzw. konstant gehalten werden. Bei der Wahl eines entsprechenden Materials zur Herstellung der Tastaturmatte gelingt es problemlos den SAR-Wert zu senken.By using electrically conductive and / or magnetic and / or dielectric materials for the keyboard mat lying in the middle, the energy radiated into the human tissue can be reduced on the one hand and the performance of the antenna can be improved or kept constant by reflection. When choosing an appropriate material for the production of the keyboard mat, the SAR value can be easily reduced.
Weitere zweckmäßige Ausgestaltungen der vorliegenden Erfindung ergeben sich aus den Unteransprüchen sowie aus der nach- folgenden Beschreibung eines Ausführungsbeispiels eines Mobilfunktelefons gemäß der vorliegenden Erfindung anhand der Figur.Further expedient refinements of the present invention result from the subclaims and from the following description of an embodiment of a mobile radio telephone according to the present invention with reference to the figure.
Die Figur zeigt in einer perspektifischen Explosionsdarstellung ein Mobilfunkgerät, bei dem die Erfindung Anwendung findet.The figure shows a perspective exploded view of a mobile radio device in which the invention is used.
In der Figur sind alle wesentlichen Teile des Mobilfunktele- fons dargestellt, wobei bei der nachfolgenden Beschreibung aber lediglich auf die wichtigsten Teile eingegangen werden soll .All essential parts of the mobile radio telephone are shown in the figure, but only the most important parts will be discussed in the following description.
Das Mobiltelefon besteht im wesentlichen aus der Oberschale 1 und der Unterschale 2, wobei sich in der Unterschale 2 ein Akkufach für den Akku 3 befindet und wobei das Akkufach mittels des Deckels 4 abgeschlossen wird. In der Oberschale befindet sich unter anderem das Display mit der Displayabdeckung 5 und die Tastatur 6. Ein Bestandteil der Tastatur 6 ist die Tastaturmatte 7.The mobile phone consists essentially of the upper shell 1 and the lower shell 2, wherein there is a battery compartment for the battery 3 in the lower shell 2 and the battery compartment is closed by means of the cover 4. In the upper shell there is, among other things, the display with the display cover 5 and the keyboard 6. A component of the keyboard 6 is the keyboard mat 7.
Diese Tastaturmatte 7 erstreckt sich zumindest teilweise im Bereich der Gerätemitte und dient zusätzlich zur Senkung der Belastungsdosis an elektromagnetischer Strahlung für den je- weiligen Benutzer, dessen Kopf sich beim Gebrauch des Mobilfunktelefons auf der Tastatur- und Display-Seite des Mobilfunktelefons befindet.This keyboard mat 7 extends at least partially in the area of the center of the device and additionally serves to reduce the exposure dose to electromagnetic radiation for the respective user whose head is on the keyboard and display side of the mobile radio telephone when using the mobile radio telephone.
Die Stelle mit der größten elektromagnetischen Abstrahlung befindet sich auf der Platine unterhalb der Tastaturmatte 7, so daß sich zwischen dem Kopf des Benutzers und der Stelle mit der größten elektromagnetischen Abstrahlung des Mobilfunktelefons die Tastaturmatte 7 befindet.The location with the greatest electromagnetic radiation is located on the board below the keyboard mat 7, so that the keyboard mat 7 is located between the head of the user and the location with the greatest electromagnetic radiation from the mobile radio telephone.
Diese Tastaturmatte ist nun erfindungsgemäß entweder aus einem elektrisch leitfähigen Material und/oder einem magnetisch wirksamen und/oder einem dielektrisch wirksamen Material her- gestellt. Durch den Einsatz dieser Materialien wird die abgestrahlte Energie d. h. die in das Gewebe des Kopfs des Benutzers eingestrahlte Energie erheblich vermindert.According to the invention, this keyboard mat is now either made of an electrically conductive material and / or a magnetically active and / or a dielectric material. posed. By using these materials, the radiated energy, ie the energy radiated into the tissue of the user's head, is considerably reduced.
Dabei ist es zweckmäßig, dass die magnetischen Materialien eine relative Permeabilität μr aufweisen, welche größer 1 ist und die dielektrisch wirksamen Materialien eine relative Dielektrizitätskonstante εr aufweisen, welche größer als 1 ist. It is expedient for the magnetic materials to have a relative permeability μ r which is greater than 1 and for the dielectrically active materials to have a relative dielectric constant ε r which is greater than 1.

Claims

Patentansprüche claims
1. Mobilfunkgerät, insbesondere Mobilfunktelefon, mit einem Gehäuse und einer in der Oberseite des Gehäuses vorgesehenen Tastatur, die sich im Wesentlichen im Bereich der Gerätemitte erstreckt, dadurch gekennzeichnet, dass die Tastatur unter anderem eine Tastaturmatte aufweist, welche aus einem elektrisch leitfähigen und/oder magnetisch und/oder dielektrisch wirksamen Material besteht.1. Mobile radio device, in particular mobile radio telephone, with a housing and a keyboard provided in the top of the housing, which extends essentially in the area of the center of the device, characterized in that the keyboard has, inter alia, a keyboard mat which consists of an electrically conductive and / or magnetically and / or dielectric material.
2. Mobilfunkgerät nach Anspruch 1, dadurch gekennzeichnet, dass die die Tastaturmatte teilweise aus einem elektrisch leitfähigen und/oder magnetisch und/oder dielektrisch wirksamen Material besteht.2. Mobile radio device according to claim 1, characterized in that the keyboard mat partially consists of an electrically conductive and / or magnetically and / or dielectric material.
3. Mobilfunkgerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass für die relative Permeabilität des magnetisch wirksamen Materials μr > 1 gilt.3. Mobile radio device according to claim 1 or 2, characterized in that for the relative permeability of the magnetically active material μ r > 1 applies.
4. Mobilfunkgerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass für die relative Dielektizitätskonstante des dielektrisch wirksamen Materials εr > 1 gilt. 4. Mobile radio device according to claim 1 or 2, characterized in that for the relative dielectric constant of the dielectric material ε r > 1 applies.
PCT/DE2002/003813 2001-10-10 2002-10-09 Mobile radiotelephone apparatus comprising a correction element reducing specific absorption rate WO2003034537A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02774449A EP1435124A1 (en) 2001-10-10 2002-10-09 Mobile radiotelephone apparatus comprising a correction element reducing specific absorption rate

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10149941A DE10149941A1 (en) 2001-10-10 2001-10-10 Mobile radio device with a correction element that reduces the SAR value
DE10149941.8 2001-10-10

Publications (1)

Publication Number Publication Date
WO2003034537A1 true WO2003034537A1 (en) 2003-04-24

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PCT/DE2002/003813 WO2003034537A1 (en) 2001-10-10 2002-10-09 Mobile radiotelephone apparatus comprising a correction element reducing specific absorption rate

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EP (1) EP1435124A1 (en)
DE (1) DE10149941A1 (en)
WO (1) WO2003034537A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102591463A (en) * 2012-01-04 2012-07-18 安方高科电磁安全技术(北京)有限公司 Low-radiation keyboard

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0603081A1 (en) * 1992-12-17 1994-06-22 Alcatel N.V. Portable radio telephone with means for protecting its user from electromagnetic radiation
US5588041A (en) * 1995-01-05 1996-12-24 Motorola, Inc. Cellular speakerphone and method of operation thereof
WO1997036380A1 (en) * 1996-03-26 1997-10-02 Euroconcept 2000 Limited Shielding radio equipment
US6044152A (en) * 1998-01-15 2000-03-28 Ericsson Inc. Shielded keyboard for a portable communication device
WO2002071534A1 (en) * 2001-03-07 2002-09-12 Siemens Aktiengesellschaft Radio communications device comprising an sar value-reducing correction element

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4336529A (en) * 1980-02-19 1982-06-22 Pitney Bowes Inc. Postage meter having shielded keyboard to protect against electromagnetic radiation
EP0633585B1 (en) * 1993-07-08 1997-11-05 Philips Patentverwaltung GmbH Housing for electric communication apparatus
DE19600770C2 (en) * 1996-01-11 1997-11-13 Ibm Security film with EMC protection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0603081A1 (en) * 1992-12-17 1994-06-22 Alcatel N.V. Portable radio telephone with means for protecting its user from electromagnetic radiation
US5588041A (en) * 1995-01-05 1996-12-24 Motorola, Inc. Cellular speakerphone and method of operation thereof
WO1997036380A1 (en) * 1996-03-26 1997-10-02 Euroconcept 2000 Limited Shielding radio equipment
US6044152A (en) * 1998-01-15 2000-03-28 Ericsson Inc. Shielded keyboard for a portable communication device
WO2002071534A1 (en) * 2001-03-07 2002-09-12 Siemens Aktiengesellschaft Radio communications device comprising an sar value-reducing correction element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102591463A (en) * 2012-01-04 2012-07-18 安方高科电磁安全技术(北京)有限公司 Low-radiation keyboard

Also Published As

Publication number Publication date
DE10149941A1 (en) 2003-04-30
EP1435124A1 (en) 2004-07-07

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