Telescopic antenna and system provided with such an antenna

Communications: radio wave antennas – Antennas – Rod type

Reexamination Certificate

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Details

C343S702000

Reexamination Certificate

active

06326933

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a telescopic antenna. It also relates to any electronic system provided with such an antenna, and notably to mobile telephones or wireless telephones.
BACKGROUND OF THE INVENTION
In a large number of electronic signal transmission systems, and notably in portable telephones, the antenna provided for transmission and reception of signals is retractable (for reasons of compactness when the system is inoperative). To this end, the antenna rod is guided during its insertion or retraction, in a semi-rigid tube, for example of synthetic resin material, accommodated in the system (in the example described, in the portable telephone), generally above the electronic card. During assembly of the antenna and the tube in the housing of the system, the end of the tube may damage the electronic components fixed on said card, and notably the contacts to which the antenna is connected.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a retractable antenna in which this drawback is obviated.
To this end, the invention relates to an antenna comprising a rod and an antenna head, said antenna being telescopic within a guiding tube having a zone of electric contact with the circuits associated with the antenna, characterized in that the extremity of the tube is closed by a plug provided to round the shape of said extremity, or alternatively, is deformed itself (with respect to its cylindrical shape) so as to give it a rounded shape.
The document U.S. Pat. No. 4,860,024 shows a portable telephone whose antenna device has a semi-spherical extremity. But this shape does not actually ensure any continuity with the rest of the device. In contrast, in the case of the invention, the solution adopted proves that a continuous geometrical surface is constituted with very great simplicity, having no unevenness nor any relief which may damage the surrounding elements and notably the electric contacts for connecting the antenna to various associated circuits.
The invention also relates to any electronic signal transmission system, such as a telephone, comprising, for the transmission and/or reception of said signals, an antenna which is telescopic within a guiding tube having a zone of contact with the circuits associated with the antenna, characterized in that the guiding tube of said telescopic antenna has a rounded shape at its extremity, which shape is obtained, for example, by hot deformation or by positioning a plug.
These and other aspects of the invention are apparent from and will be elucidated, by way of non-limitative example, with reference to the embodiments described hereinafter.


REFERENCES:
patent: 4860024 (1989-08-01), Egashira
patent: 0772255A1 (1997-05-01), None
patent: 0823748A2 (1998-02-01), None
patent: 2257837A (1993-01-01), None
patent: 2308502A (1997-06-01), None

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