| 摘要 |
The invention relates to a shielding device to be fixedly arranged on a hand-held mobil radio transmission means (1), such as a mobile phone, and which protects a user against electromagnetic radiation from said radio transmission means (1) when said radio transmission means is used. The shielding device (10) comprises at least on substantially plane shielding member (12) of metal, where the metal is a nickel alloy, especially mu-metal. The shielding member (12) defines at least partially an acoustic resonance chamber (18) communicating with the air surrounding the shielding device through at least one sound channel (19). According to the invention, a shielding device (10) is obtained, which protects the user very efficiently against electromagnetic radiation transmitted by the radio transmission means (1) when it has been fixedly arranged on said radio transmission meams opposite the loudspeaker while it simultaneously allows sound from the loudspeaker to pass without causing a noticeably deterioration of the sound quality. The invention relates furthermore to a hand-held mobile radio transmission means (1), such as a mobile phone, and which has been provided with a shielding device (10).
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