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Portable electronic device
| Details |
Inventors: Iwahara, Hiroki; Horiguchi, Yoshinori;
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Appiah; Charles N.
Assistant Examiner:
Attorney, Agent or Firm: Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
A portable electronic device includes a transmitting circuit, an X-ray detector, and a controller. The transmitting circuit includes a power amplifier for amplifying radio waves. The detector is arranged to detect X-rays radiated from an installation arranged on a passageway to an area where radiation of electromagnetic waves is restricted. When X-rays with a certain intensity or more are detected by the detector, a controller recognizes that the device is about to enter the area, and reduce the gain of the power amplifier, so that the transmitting circuit is set to be unable to radiate radio waves. |
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DETAILED DESCRIPTION OF THE INVENTION At first, the first embodiment will be explained with reference to FIG.
1.
In the first embodiment, when external X-rays with a certain intensity or more are detected, the gain of the power amplifier of a transmitting circuit, i.
e.
, a circuit capable of radiating radio waves, arranged in the device is reduced.
As a result, radio waves to be radiated from the antenna of the device are suppressed at a certain intensity or less.
FIG.
1 is a block diagram showing the structure of the main part of an electronic device according to the first embodiment.
In FIG.
1, there is shown an X-ray counter 11, a comparator 12, a control signal generator 13, a transceiver antenna (aerial) 15, a transceiver 16, and an antenna sharing unit 17.
The transceiver 16 includes a transmitter 16A and a receiver 16B so as to perform data-communication with another device through the antenna 15.
The transmitter 16A includes a power amplifier 14 as well as a signal processing unit (not shown) for packetizing data, etc.
, and a modulating circuit (not shown) for hopping frequencies, etc.
The receiver 16B includes a demodulating circuit (not shown) for demodulating hopping-data, etc.
, and a signal processing unit (not shown) for depacketizing data, etc.
Note that this constitution of the transceiver is common to the other embodiments described later.
The X-ray counter 11 counts the amount of X-rays per unit of time, and outputs the counted value as an X-ray count signal S1.
The X-ray count signal S1 obtained by the X-ray counter 11 is inputted into the comparator 12.
The comparator 12 compares the counted value of the X-ray count signal S1 inputted from the X-ray counter 11 with a predetermined threshold value S2.
When the counted value of the X-ray count signal S1 inputted from the X-ray counter 11 is larger than the threshold value S2, the comparator 12 outputs a detection pulse signal S3.
The detection pulse signal S3 outputted from the comparator 12 is inputted into the control signal generator 13
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Ring Tones 
