Patent Abstract:
An electronic device includes a device main body, card controller, and device controller. The use of the device main is permitted by inserting an authentic user identification card on which personal information of a holder is recorded. The card controller detects removal/insertion of the user identification card from/into the device main body during a power-off state. The device controller displays a warning representing removal/insertion of the card on the basis of the detection result of the card controller in power-on operation. A unique information management method for the electronic device is also disclosed.

Full Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to an electronic device such as a portable telephone which permits the use of the electronic device when an authentic user identification card on which personal information of the holder (subscriber) is recorded, and a unique information management method. 
     In recent years, people often carry cards such as credit cards on which personal information is recorded. Along with this, crimes of illicit copy and misuse of cards without any permission of authentic holders are increasing. In the field of electronic devices such as portable telephones, there is recently proposed a system of enabling communication by mounting a user identification card called a SIM (Subscriber Identity Module) card on a telephone main body. The SIM card on which personal information of the holder is recorded is always inserted into a telephone, and the telephone is turned on/off in accordance with whether the telephone is used or not. 
     Even if the user does not own a telephone, or the user cannot use his/her own telephone because of a dead battery or the like, the user can make speech communication using his/her own ID code by inserting his/her SIM card into the telephone of another person or a public telephone. In this case, charging processing can target the holder of the SIM card. Using a telephone owned by another person, the cardholder can make a call by one-touch operation on the basis of memory dial data stored in the SIM card. 
     Even such a convenient user identification card such as a SIM card may be illicitly copied and misused without any permission of the authentic holder, similar to a credit card. If the user identification card is lost, the authentic holder notifies the loss or theft of the card. However, if the card is returned after being removed from an electronic device and copied without any permission of the holder, the holder cannot recognize illicit copy of the card. 
     For this reason, the conventional system suffers the problem that an electronic device such as a portable telephone is misused to charge the card holder owing to the malicious intent of another person who illicitly copied the user identification card. The personal information of the authentic holder is read from the user identification card and leaks out. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide an electronic device for preventing illicit copy of a user identification card or leakage of personal information recorded on a user identification card, and a unique information management method. 
     To achieve the above object, according to the present invention, there is provided an electronic device comprising a device main body whose use is permitted by inserting an authentic user identification card on which personal information of a holder is recorded, card control means for detecting removal/insertion of the user identification card from/into the device main body during a power-off state, and device control means for displaying a warning representing removal/insertion of the card on the basis of a detection result of the card control means in power-on operation. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a block diagram showing a portable telephone according to an embodiment of the present invention; 
     FIG. 2 is a perspective view showing the portable telephone in FIG. 1; 
     FIG. 3 is a flow chart showing a control operation of a SIM card controller in FIG. 1; 
     FIG. 4 is a flow chart showing another control operation of the SIM card controller in FIG. 1; 
     FIG. 5 is a flow chart showing the control operation of a controller when the power switch is pressed; and 
     FIG. 6 is a view showing a state in which the portable telephone of the present invention receives radio waves from three base stations. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The present invention will be described in detail below with reference to the accompanying drawings. 
     FIG. 1 shows a portable telephone according to an embodiment of the present invention, and FIG. 2 shows the portable telephone in FIG.  1 . This embodiment will exemplify a portable telephone as an example of an electronic device. 
     As shown in FIG. 2, a portable telephone  20  has a key operation portion  1  and display  2  which are arranged on upper and lower portions of the front surface. The key operation portion  1  includes many dial keys corresponding to figures, characters, and various other symbols such as “#” and “*”, power switches, and the like. The display  2  is formed from a liquid crystal display device, and displays various messages on the screen. 
     A microphone  3  for inputting speech to be transmitted is arranged at the lower portion of the portable telephone  20 , and a loudspeaker  4  for outputting a speech signal such as received speech or a ringing tone is arranged above the display  2 . An antenna  5  is freely extendably attached to the upper end of the portable telephone  20 . A slot (not shown) for detachably inserting a SIM card  6  is formed on the back side of the portable telephone  20 . The SIM card  6  is inserted into the slot to make electrical connection to a SIM card controller  7  via a serial interface (to be referred to as a serial I/F hereinafter)  8 . 
     As shown in FIG. 1, the SIM card  6  incorporates a nonvolatile memory  61  which stores personal information such as a telephone number, the account number of a bank, or a telephone directory. The SIM card controller  7  always monitors via the serial I/F  8  whether the SIM card  6  is inserted into the slot. 
     In addition to the key operation portion  1 , display  2 , SIM card  6 , and SIM card controller  7 , the portable telephone  20  comprises a controller  9  formed from a microcomputer or the like to control the overall portable telephone  20 , the antenna  5 , a transmitter/receiver  10  connected to the antenna  5 , a data converter  11  connected to the transmitter/receiver  10 , a speech processor  12  connected to the data converter  11 , the microphone  3  and loudspeaker  4  that are connected to the speech processor, a memory  13 , a primary battery  14 , a secondary battery  15 , and a power controller  16 . 
     The key operation portion  1  is connected to the controller  9 , and an operation signal from the key operation portion  1  is input to the controller  9 . The display  2  is connected to the controller  9 , and display operation of the display  2  is controlled by the controller  9 . The memory  13  and SIM card controller  7  are connected to the controller  9 . The memory  13  stores control programs for communication (speech communication and mail transmission/reception) and various data. 
     The slot of the SIM card  6  is formed on the back side of the primary battery  14 , and exposed by removing the primary battery  14 . The SIM card  6  is removed/inserted while the primary battery  14  is kept removed, so the SIM card  6  and SIM card controller  7  must operate even while the primary battery  14  is removed. Thus, the SIM card  6  and SIM card controller  7  receive power from the secondary battery  15  mainly used to back up a timepiece function in the portable telephone. 
     The primary battery  14  is connected to the controller  9 , and the secondary battery  15  is connected to the SIM card  6  and SIM card controller  7 . The power controller  16  is connected between the primary battery  14  and the secondary battery  15 . In this connection, the power controller  16  converts the voltage of the primary battery  14  into a predetermined power supply voltage, and supplies the power supply voltage to the respective building circuits of the portable telephone  20  including the controller  9 . When the primary battery  14  is mounted in the portable telephone  20 , the power controller  16  supplies a voltage from the primary battery  14  to the SIM card  6  and SIM card controller  7 . When the primary battery  14  is removed, the power controller  16  supplies a voltage from the secondary battery  15  to the SIM card  6  and SIM card controller  7 . 
     The operation of the portable telephone  20  having this arrangement will be described with reference to the flow chart shown in FIG.  3 . 
     While the portable telephone  20  is OFF, the SIM card controller  7  periodically transmits an inquiry signal to the SIM card  6  via the serial I/F  8  (step S 71 ), and checks whether the SIM card  6  responds to the inquiry signal (step S 72 ). With this operation, the SIM card controller  7  always monitors whether the SIM card  6  is inserted into the slot. If the SIM card  6  does not respond, the SIM card controller  7  determines that the SIM card  6  is not connected and is removed from the slot, and stores in a memory  7   a  the current time and position information (base station number) of the portable telephone  20  sent from a corresponding base station (step S 73 ). 
     In this manner, the memory  7   a  stores SIM card removal/insertion information including the removal time of the SIM card  6  and position information of the portable telephone  20  at that time. Note that the SIM card removal/insertion information may be only the time or the date and time. The SIM card controller  7  may monitor whether the SIM card  6  is inserted into the slot only when the primary battery  14  is removed. In this case, power consumption can be suppressed. 
     A signal received by the antenna  5  as position information of the portable telephone  20  is decoded by the transmitter/receiver  10 , and necessary information is extracted from the decoded signal by the data converter  11 . The extracted position information is sent to the SIM card controller  7  via the controller  9 . Note that position information is periodically transmitted from the base station. As soon as position information changes, it is sent to the SIM card controller  7  via the controller  9  to always hold the latest position information in the memory  7   a  of the SIM card controller  7 . 
     If the SIM card  6  does not respond, the SIM card controller  7  copies the current position information stored in a given area of the memory  7   a  to another area of the memory  7   a , thereby storing the current position information as SIM card removal/insertion information. Note that the latest position information and SIM card removal/insertion information are stored in different areas of the memory  7   a , but may be respectively stored in two independent memories. 
     Another operation of the SIM card controller  7  will be explained with reference to the flow chart shown in FIG.  4 . The SIM card controller  7  checks the physical connection state (e.g., voltage) of the terminal of the serial I/F  8 , and always monitors whether the serial I/F  8  is connected to the SIM card, i.e., the SIM card  6  is inserted into the slot (step S 74 ). If the SIM card  6  is not connected to the serial I/F  8 , the SIM card controller  7  stores the current time and current position information as SIM card removal/insertion information in the memory  7   a  (step S 75 ). 
     The operation of the portable telephone  20  when the power switch of the key operation portion  1  is pressed will be described with reference to FIG.  5 . If the power switch of the key operation portion  1  is pressed, the controller  9  of the portable telephone  20  displays a message prompting input of a PIN code (password number) on the screen of the display  2 . In response to this, the user of the portable telephone  20  operates the key operation portion  1  to input the PIN code (step S 101 ). 
     The controller  9  collates the PIN code input from the key operation portion  1  with a PIN code registered in the SIM card  6 , and determines whether the user is authentic (step S 102 ). If the input PIN code is correct, the controller  9  refers to the SIM card controller  7  to check whether the SIM card  6  was removed and inserted before power-on operation (step S 103 ). That is, the controller  9  checks whether the memory  7   a  stores SIM card removal/insertion information. 
     If the memory  7   a  stores SIM card removal/insertion information, the controller  9  determines that the SIM card  6  was removed and inserted before power-on operation, and displays the SIM card removal/insertion information on the screen of the display  2  (step S 104 ). The controller  9  displays a message on the screen of the display  2  to confirm whether the SIM card removal/insertion information is saved (step S 105 ). 
     If the user designates saving of the information by operating the key operation portion  1 , the SIM card removal/insertion information is kept saved in the memory  7   a , and can always be checked. If the user designates erase of the information by operating the key operation portion  1 , the controller  9  erases the SIM card removal/insertion information stored in the memory  7   a  via the SIM card controller  7  (step S 106 ). Then, the controller  9  enters a normal mode in which communication is done (step S 107 ). 
     If the memory  7   a  does not store SIM card removal/insertion information (NO in step S 103 ), the controller  9  determines that the SIM card  6  was not removed or inserted before power-on operation, and immediately enters the normal mode. 
     In the normal mode, a signal received by the antenna  5  is demodulated by the transmitter/receiver  10 , and converted into speech data by the data converter  11 . The converted speech data is converted into a transmission signal (analog speech signal) by the speech processor  12 , and output from the loudspeaker  4 . To the contrary, a reception signal (analog speech signal) input from the microphone  3  is converted into speech data by the speech processor  12 , and converted into communication data by the data converter  11 . The converted communication data is modulated by the transmitter/receiver  10 , and transmitted from the antenna  5 . 
     In mail reception, a signal received by the antenna  5  is demodulated by the transmitter/receiver  10 , and converted into communication data. The converted communication data is converted into character data by the data converter  11 , and displayed on the display  2 . In mail transmission, character data input from the key operation portion  1  or stored in the memory  13  in advance is converted into communication data by the data converter  11 . The converted communication data is modulated by the transmitter/receiver  10 , and transmitted from the antenna  5 . 
     As described above, in the portable telephone  20  of this embodiment, whether SIM card removal/insertion information is written in the memory  7   a  of the SIM card controller  7  is detected before a service starts upon power-on operation. Accordingly, whether the SIM card  6  was removed and inserted before power-on operation is determined. If the SIM card  6  is determined to have been removed and inserted, a card removal/insertion warning is issued by informing the user of SIM card removal/insertion information including the removal time of the SIM card  6  or the like. 
     If the user of the portable telephone  20  does not remember the removal/insertion represented by this warning, he/she can estimate when and where the SIM card  6  was removed by a third party, from the SIM card removal/insertion information displayed on the display  2 . In this case, the user immediately takes the cancellation procedure of the SIM card  6  with respect to the company of the mobile communication system, and prevents misuse of the SIM card  6 . If the card  6  is removed while the portable telephone  20  is ON, warning display including an alarm sound is sent right away. 
     In this embodiment, the removal time and position information of the SIM card  6  are stored as SIM card removal/insertion information in the memory  7   a . Moreover, the field strength of the base station when the SIM card  6  was removed may be stored as SIM card removal/insertion information in the memory  7   a . This field strength information can be obtained by the transmitter/receiver  10  which demodulates a signal received by the antenna  5 , and is sent to the SIM card controller  7  via the controller  9 . This enables further specifying the removal place of the SIM card  6 . 
     The field strengths of a plurality of base stations when the SIM card  6  was removed are stored as SIM card removal/insertion information in the memory  7   a , which allows specifying the removal location of the SIM card  6  in more detail. For example, a W-CDMA (Wideband-Code Division Multiple Access) portable telephone  20  receives radio waves from three base stations BS 1 , BS 2 , and BS 3 , as shown in FIG.  6 . Thus, the field strengths of the three base stations BS 1  to BS 3  when the SIM card  6  was removed can be stored as SIM card removal/insertion information in the memory  7   a.    
     In this embodiment, SIM card removal/insertion information is written once. Alternatively, new SIM card removal/insertion information may be additionally written in the memory  7   a  every time removal/insertion of the SIM card  6  is detected. In this case, the log of SIM card removal/insertion information corresponding to the number of removal/insertion operations of the SIM card  6  can be recorded. Note that all the log of SIM card removal/insertion information may be erased at once in step S 105  of FIG. 5, or part thereof may be erased. 
     In this embodiment, SIM card removal/insertion information is displayed. However, when specific information is not wanted to be recognized by the user, e.g., private information such as position information (base station number) or field strength information is not wanted to be recognized, only information which can be disclosed to the user (e.g., removal time of the SIM card  6 ) may be displayed without displaying these pieces of information. In this case, SIM card removal/insertion information such as position information or field strength information is analyzed when a person in charge of a mobile communication system company carries the portable telephone to the service center. 
     In this embodiment, the SIM card controller  7  detects removal/insertion of the SIM card  6  in power-off operation of the telephone, and displays removal/insertion information of the SIM card  6  as a warning. Alternatively, removal/insertion of the SIM card  6  may be detected regardless of power-on/off operation of the telephone. In this case, a warning is displayed in the first power-on operation after the SIM card  6  is removed/inserted. 
     This embodiment has exemplified a portable telephone as an example of an electronic device which permits its use when an authentic user identification card is inserted. The present invention is not limited to this, and may be applied to another electronic device. Position information includes position information representing a single radio zone, and position registration information including a plurality of radio zones. 
     As has been described above, according to the present invention, a warning is issued in power-on operation when removal/insertion of a user identification card before power-on operation is detected. This allows monitoring illicit removal/insertion of the user identification card. As a result, the user can recognize the possibility of misuse of the user identification card or leakage of personal information recorded on the user identification card. 
     Since removal/insertion information representing that the user identification card was removed and inserted before power-on operation is written in a memory means, the removal/insertion information can be saved and always be checked. 
     If removal/insertion information is written every time a detection means detects removal/insertion of the user identification card, the log of removal/insertion information corresponding to the number of removal/insertion operations of the user identification card can be recorded. 
     When removal/insertion information is information representing the removal time of the user identification card, the holder can know the time when the user identification card was illicitly removed and inserted. 
     When removal/insertion information is information representing the removal location of the user identification card, the holder can know the location where the user identification card was illicitly removed and inserted. 
     When removal/insertion information is information representing the field strength of the base station when the user identification card was removed, the holder can specify in more detail the location where the user identification card was illicitly removed and inserted.

Technology Classification (CPC): 7