Telecommunications – Transmitter and receiver at same station – Having particular housing or support of a transceiver
Patent
1995-08-15
1998-07-28
Vo, Nguyen
Telecommunications
Transmitter and receiver at same station
Having particular housing or support of a transceiver
455117, 455128, H04B 138
Patent
active
057873402
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for radio communication, such as for example a radiophone.
The popularity of radiophones has been rapidly increasing during the last ten years. At the same time a belief of potential health hazards related to non-ionizing radiation has been increasing. The power radiated by a radiophone is relatively low, typically few hundred milli-watts. On the other hand the antenna means of radiophones are few centimeters from the brain, the hearing organs and the organ of equilibrium. Although a direct heating effect could be left without further consideration it has been suggested that modulated radio frequency radiation induces changes in the electrical status i.e. in the ion balance of nerve cells. A continuous localized exposure to radio frequency irradiation has been suggested to weaken myelin sheets of cells and to eventually lead to an impairment of hearing capability, vertigo etc.. It has been suggested that radio frequency irradiation may stimulate extra growth among supportive cells in the nerve system, which in the worst case it has been suggested could to a development of malignant tumor e.g. glioma from supportive cells. Although the consequences described above have not been scientifically verified, the uncertainty has some effects e.g. by reducing the speed of growth of the market of radiophones.
The invention avoids the drawbacks of the prior art and reduces the irradiation of the user, especially the brain and the nerve tissues. The invention and corresponding apparatus based thereon are characteized by what is set forth in the characterizing sections of the annexed claims.
The invention will now be described in more detail with reference made to the accompanying drawings, in which:
FIG. 1 shows the main features of a radiophone of the prior art.
FIG. 2 shows schematically the position of a radiophone relative to the users head and lists major tissues which are penetrated by electromagnetic radiation emitted by the radiophone.
FIG. 3a-3d show a radiophone of the invention.
FIG. 4 shows a detail of a radiophone of the invention looked from the side of the antenna.
FIG. 5a-5d show a construction of the shielding layer of a radiophone of the invention.
FIG. 6 shows another construction of the shielding layer of a radiophone of the invention.
FIG. 7 shows another radiophone of the invention.
FIG. 8a-8b show third radiophone of the invention.
FIG. 9a-9b show fourth radiophone of the invention.
FIG. 10 shows one solution of the invention to increase the protection of the user against the irradiation from the radiophone.
FIG. 1 shows the most prominent parts of a radiophone which are visible from outside: A is antenna, which is typically so called helix type. In the most radiophones the antenna is covered with rubberlike material with carefully selected electrical properties. When the radiophone is not to be used the antenna may be positioned at least partially inside the body of the radiophone. In some devices the part which is left outside is also designed to operate as an antenna with reduced radiation efficiency and reception sensitivity.
The following parts are also visible: M is a microphone, P is a headphone and KB is a keyboard.
FIG. 2 shows schematically a position of antenna A of radiophone PH relative to brain BRAIN. The view CUT A is shown in the lower section of the figure. As shown in the figure, the power radiated by A is first penetrating a thin skin layer SKIN and thereafter a fat layer FAT. Either of these layer does not significantly attenuate or reflect electromagnetic. radiation. A muscle layer MUSCLE of the head in relatively thin, therefore this layer does not markedly attenuate the penetrating power. Bone and bone marrow do not significantly attenuate penetrating radiation, although this layer is relatively thick. It has been suggested that most of the incoming energy is absorbed by cerebrospinal fluid CSF and brain tissue BRAIN. CSF layer is usually thin. Because antenna A is very close to brain tissue and the distance is much shorter tha
REFERENCES:
patent: 3435456 (1969-03-01), Robb
patent: 5150282 (1992-09-01), Tomura et al.
patent: 5151946 (1992-09-01), Martensson
patent: 5335366 (1994-08-01), Daniels
patent: 5336896 (1994-08-01), Katz
patent: 5444866 (1995-08-01), Cykiert
Article "Shielding Against Electromagnetic Interference" published in the Mar./Apr. 1979 issue of Platics Design Form.
Nokia Mobile Phones
Vo Nguyen
LandOfFree
Radiation shielding apparatus for communication device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radiation shielding apparatus for communication device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radiation shielding apparatus for communication device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-34072