US 6,785,519 B2Granted

Portable telephone

AssigneeSony Corporation

InventorsJunichi Toyoda, Katsumi Okayama

Life of this patent

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Abstract

The portable telephone capable of more effectively reducing the electromagnetic energy to be radiated therefrom and absorbed by the human body during its use is provided. The portable telephone is comprised of: an antenna; a microphone; a transmitting circuit for modulating a first audio signal to produce a first radio signal, and transmitting the same; a receiving circuit for demodulating a second radio signal received via the antenna, and reproducing a second audio signal; a receiver for outputting an audio sound corresponding to the second audio signal; a printed circuit board on which the receiving and the transmitting circuits are mounted; a shield case surrounding the printed circuit board so as to suppress the electromagnetic interference between the printed circuit board and the antenna; the housing for accommodating the shield case and so on; the electromagnetic wave absorption layer including a magnetic loss material, formed at least in a part between the shield case and the housing; and the electromagnetic wave reflection layer including a magnetic reflection material, formed between the housing and the electromagnetic wave absorption layer.

Claims14

Dependent claims

A portable telephone comprising:

an antenna;
a microphone for generating a first audio signal corresponding to a sound entered to said microphone;
a transmitting circuit for modulating said first audio signal from said microphone to generate a first radio signal, and transmitting said first radio signal via said antenna;
a receiving circuit for receiving a second radio signal which is modulated from a second audio signal via said antenna, and demodulating said second radio signal to reproduce said second audio signal;
a receiver for outputting a sound corresponding to said second audio signal from said receiving circuit;
a printed circuit board on which said receiving circuit and said transmitting circuit are mounted;
a shield case which surrounds said printed circuit board for suppressing an electromagnetic interference between said printed circuit board and said antenna, and has an electrical conductivity at least on its surface;
a housing for accommodating said microphone, said receiver and said shield case;
an electromagnetic wave absorption layer containing a magnetic loss material, provided at least in a portion between said shield case and said housing;
and
an electromagnetic wave reflection layer containing a magnetic reflection material, provided between said housing and said electromagnetic wave absorption layer.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/034,407Filed 27 Dec 2001
Priority: JP P2000-39734527 Dec 2000
Published: US 2002/0160725 A131 Oct 2002
Granted: 31 Aug 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H01Q 17/001
Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems: for modifying the…
H01Q 1/245
Specially adapted for hand-held use: with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
H04B 1/3838
Hand-held transceivers: arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use
H01Q
Antennas, i.e. radio aerials