JP2007019748A - Mobile terminal, and authentication control method and authentication control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal, an authentication control method and an authentication control program, whereby limitation placed on the use of functions of the terminal is decreased while keeping security and each function can be used in matching with the actual state of use. <P>SOLUTION: The mobile terminal 100 includes: an authentication signal level detection section 143 for detecting a radio wave strength level from a key unit 200; a use limit level determination section 125 for comparing a received radio wave strength level with a specified value to determine a use limit level; and a use limit unit 126 that sets a limit level at which functions 131 to 135 of a function section 127 usable at the establishment of authentication are limited, and the mobile terminal sets the use limit level of the terminal on the basis of a distance between the key unit 200 and the mobile terminal itself to place a limit on its functions. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile terminal device such as a mobile phone that performs radio authentication by transmitting and receiving radio signals to and from a radio communication unit, an authentication control method, and an authentication control program.

  Conventionally, use restriction functions have been added to mobile phones as a measure for preventing unauthorized use by persons other than the owner due to theft or the like. In general, the use restriction function enables a call by releasing the use restriction by an ID by the owner, that is, a personal identification number. The use restriction by the personal identification number and the cancellation thereof require an operation with the keyboard, and the restriction and the release operation are required every time a call is made. If the use restriction is not performed after the call, there is a possibility that the call is made without limitation when the mobile phone is stolen.

  Patent Document 1 discloses that when a device such as a mobile phone leaves the owner or the user due to misplacement or theft, the device itself becomes unusable, and the use restriction of the device warns that the device has been separated by a certain distance or more. An apparatus is disclosed.

  FIG. 13 is a diagram for explaining a use restriction method for restricting use of a mobile terminal device using wireless authentication communication.

  As shown in FIG. 13, when the mobile terminal device 10 such as a mobile phone is separated from the user 1 and away from the authentication distance, the mobile terminal device 10 is disabled and the wireless communication unit (hereinafter referred to as a key) possessed by the user 1 is disabled. (Called unit) 20 sounds a misplacement alarm. Specifically, in a system that performs wireless authentication by receiving a wireless signal between the key unit 20 and the use restriction releasing unit in the mobile terminal device 10, each unit detects that the reception level is below a certain value. Then, the use restriction release unit stops sending the use restriction release signal, thereby restricting the use of the mobile terminal device 10, and the key unit 20 issues an alarm signal. Thereby, misplacement and theft can be prevented.

  FIG. 14 is a block diagram for realizing the method of restricting use of the mobile terminal device of FIG.

  In FIG. 14, the mobile terminal device 10 such as a mobile phone / PHS (Personal Handy-Phone System), PDA (Personal Digital Assistants), notebook PC, MP3 player, HDD player, etc., and the mobile terminal device 10 communicate with each other (polling). ), A key unit 20 that automatically locks the mobile terminal device 10 and sounds an alarm when the distance is more than a certain distance, and includes wireless authentication units 11 and 21 for performing wireless authentication with each other. The key unit 20 is driven by a battery 22.

  The wireless authentication unit 21 of the key unit 20 and the wireless authentication unit 11 of the mobile terminal device 10 perform authentication using wireless communication. The wireless authentication unit 21 of the key unit 20 and the wireless authentication unit 11 of the mobile terminal device 10 perform authentication at all times by grasping that they have a previously associated ID and are paired with each other by wireless communication.

  FIG. 15 is a control sequence diagram illustrating an operation of wireless authentication between the mobile terminal device 10 and the key unit 20.

  As shown in FIG. 15, the key unit 20 periodically transmits a search signal. The mobile terminal device 10 that has received the search signal collates the ID of the key unit 20 included in the search signal with the ID of the self (mobile terminal device 10), and responds if the ID is a combination registered in advance. Returns a signal. The key unit 20 also collates the ID of the mobile terminal device included in the response signal with the ID of the self (key unit 20). After confirming each other, the data (authentication signal 1) obtained by encrypting the random number is sent from the key unit 20, and the mobile terminal device 10 sends the data (authentication signal 1 ′) obtained by decrypting the data. Do.

  While the portable terminal device 10 and the key unit 20 are mutually authenticated, the portable terminal device 10 can be operated without any problem. When the authentication is not normally performed, the operation of the mobile terminal device 10 is restricted, and the key unit 20 issues an alarm.

FIG. 16 is a diagram illustrating a combination of the mobile terminal device 10 and the key unit 20. The key unit 20 is schematically shown in the shape of a key (key). As shown in FIG. 16A, the mobile terminal device 10 can be applied to a PDA shown in FIG. 16B, a notebook PC shown in FIG.
Japanese Patent Laid-Open No. 11-88499

  However, in such a portable terminal device that performs conventional wireless authentication, when the key unit and the portable terminal device are not authenticated, all the functions of the portable terminal device are suddenly disabled. was there. For example, even if it is clear that the key unit has been placed in a cage that is visible to the user and it is clear that it has not been misplaced or stolen, authentication may not be possible depending on the radio wave conditions, etc., and all functions of the mobile terminal device will be used This may be impossible and is very inconvenient for the user of the mobile terminal device.

  The present invention has been made in view of the above points, and is capable of reducing restrictions on the use of device functions while maintaining security, and capable of achieving wireless authentication, an authentication control method, and the like. An object is to provide an authentication control program.

  Another object of the present invention is to provide an easy-to-use portable terminal device, an authentication control method, and an authentication control program that can use each function according to the actual situation of use while maintaining security. .

  The portable terminal device of the present invention includes a wireless authentication unit that performs wireless authentication by transmitting and receiving a wireless signal to and from a wireless communication unit, a distance measuring unit that measures a distance between the wireless communication unit, and the measured A configuration is provided that includes a use restriction level setting unit that sets the use restriction level of the device based on the distance, and a device function restriction unit that restricts the function of the device based on the set use restriction level.

  The portable terminal device of the present invention leaves a part of all functions of the device when a wireless authentication unit that performs wireless authentication by transmitting and receiving a wireless signal to and from the wireless communication unit, and when the authentication by the wireless authentication unit is not established As described above, a configuration is used that includes a use restriction level setting unit that sets a use restriction level of a device and a device function restriction unit that restricts the function of the device based on the set use restriction level.

  The portable terminal device of the present invention is set with a wireless authentication unit that performs wireless authentication by transmitting and receiving a wireless signal to and from a wireless communication unit, and a use restriction level setting unit that sets a device use restriction level by a hysteresis operation. And a device function restricting means for restricting the function of the device according to the use restriction level.

  The authentication control method of the present invention is an authentication control method for performing wireless authentication by transmitting and receiving a wireless signal between a wireless communication unit and a use restriction releasing unit in a portable terminal device, wherein the wireless communication unit and the wireless communication unit A step of measuring a distance between portable terminal devices, a step of setting a use restriction level of the portable terminal device based on the measured distance, and a function of the portable terminal device being restricted by the set use restriction level Steps.

  The authentication control method of the present invention is an authentication control method for performing wireless authentication by transmitting and receiving a wireless signal between a wireless communication unit and a use restriction releasing unit in a portable terminal device, and when the authentication is not established, A step of setting a use restriction level so as to leave a part of all functions of the terminal device, and a step of restricting the function of the mobile terminal device according to the set use restriction level.

  An authentication control method of the present invention is an authentication control method for performing wireless authentication by transmitting and receiving a wireless signal between a wireless communication unit and a use restriction releasing unit in a mobile terminal device, wherein the mobile terminal device has a hysteresis operation. A step of setting a use restriction level, and a step of restricting the function of the portable terminal device according to the set use restriction level.

  From another point of view, the present invention provides an authentication control method for performing wireless authentication by transmitting and receiving a wireless signal between a wireless communication unit and a use restriction releasing unit in a mobile terminal device, the wireless communication unit comprising: Measuring a distance between the portable terminal devices; setting a use restriction level of the portable terminal device based on the measured distance; and restricting a function of the portable terminal device according to the set use restriction level Is a program for causing a computer to execute the step of performing.

  According to the present invention, it is possible to reduce restrictions on the use of device functions while maintaining security. Moreover, each function can be used according to the actual situation of use while maintaining security, and the usability of the mobile terminal device can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a mobile terminal device using an authentication control method according to Embodiment 1 of the present invention. This embodiment is an example in which a mobile phone is applied to a mobile terminal device.

  In FIG. 1, 100 is a mobile phone (mobile terminal device) that performs wireless authentication, and 200 is a key unit (wireless communication unit) that performs bidirectional wireless communication with the mobile terminal device 100 for authentication.

  A mobile phone (mobile terminal device) 100 is composed of a CPU or the like, and a control unit 110 that controls the entire device, a mobile phone communication unit 112 having an antenna 111, an antenna 121 for performing wireless communication with the key unit 200, and a key unit 200. A wireless authentication unit 122, an alarm circuit unit 123, an external output unit 124, an authentication signal level detection unit 143, a use restriction level determination unit 125, a use restriction device 126, and a function unit 127 that can be used when authentication is established. Composed. In addition, the wireless authentication unit 122 includes a transmission / reception unit 140 that transmits and receives an ID, an authentication ID storage unit 141 that stores an ID for authentication, a wireless authentication control unit 142 that compares a stored ID with a received ID, and an authentication signal A level detection unit 143 is provided.

  The authentication signal level detection unit 143 detects the radio wave intensity level from the key unit 200. The distance between the portable terminal device 100 and the key unit 200 is measured based on the detected signal strength level of the radio signal.

  The use restriction level determination unit 125 sets a step-by-step specified value regarding the radio wave intensity level, and compares the received radio wave intensity level with the specified value to determine the use limit level. A specific example of the use restriction level will be described later with reference to FIG.

  The use restriction device 126 sets a restriction level for restricting the functions 131 to 135 of the function unit 127 that can be used when authentication is established, based on an instruction from the use restriction level determination unit 125.

  The function unit 127 that can be used when the authentication is established includes a restriction level 1 function 131 without function restriction, a restriction level 2 function 132 that restricts a payment function, a restriction level 3 function 133 that restricts operations related to address books and mails, A restriction level 4 function 134 for restricting functions related to outgoing calls and a restriction level 5 function 135 for restricting all functions are provided. In addition, when authentication is not established, it is possible to set the device use restriction level so that a part of all the functions of the device is left.

  The mobile phone communication unit 112 is a carrier communication unit of the mobile terminal device 100 and includes a transmission / reception switching unit 113, a transmission unit 114, and a reception unit 115. Since this embodiment is an example in which the mobile terminal device 100 is applied to a mobile phone, the communication function of the mobile phone body is shown, but the mobile terminal device 100 is a PDA, notebook PC, MP3 player, HDD player. In this case, this part becomes a main body function part of these portable devices.

  Specifically, the external output unit 124 is an LCD display unit, an LED light emitting unit, a speaker, a vibrator, a voice synthesis output using a PCM codec, or the like.

  On the other hand, the key unit 200 includes an antenna 221 for performing wireless communication with the wireless authentication unit 122 of the mobile terminal device 100, a wireless authentication unit 222, an alarm circuit unit 223, an external output unit 224, and a battery 225 that supplies power to each unit. It is configured with. In addition, the wireless authentication unit 222 includes a transmission / reception unit 230 that transmits and receives an ID, an authentication ID storage unit 231 that stores an ID for performing authentication, and a wireless authentication unit control unit 232 that performs verification of the received ID and the received ID. Configured.

  The wireless authentication unit 222 of the key unit 200 and the wireless authentication unit 122 of the mobile terminal device 100 are configured by a communication module that performs bidirectional wireless communication with low power consumption using, for example, a weak wireless frequency band of 300 MHz band.

  Hereinafter, an authentication control operation of the mobile terminal device configured as described above will be described.

  FIG. 2 is a diagram for explaining the basic concept of this authentication control method.

  As shown in FIG. 2, the use restriction level is changed step by step depending on the distance between the key unit 200 and the mobile terminal device 100. The use restriction level is, for example, a usable level of incoming / outgoing / address / mail / electronic payment. In FIG. 2, an electronic settlement area 301, an address book / mail operation area 302, an incoming / outgoing area 303, and an incoming-only area 304 are set in ascending order of the distance between the key unit 200 and the portable terminal device 100. . An all-function unusable area 305 exists outside the incoming call-only area 304. The all-function unusable area 305 is an area where authentication between the key unit 200 and the mobile terminal device 100 is not established, and the inside thereof is an area where authentication is established. In the present embodiment, in addition to the determination of whether the authentication is established or not, in the case where the authentication is established, the level of use restriction is further changed stepwise based on the distance between the key unit 200 and the portable terminal device 100. In FIG. 2, the distance from the key unit 200 with the mobile terminal device 100 as the center is indicated by an arrow. However, since the distance is a relative distance between the two, the distance is determined with the key unit 200 as the center. The usage restriction level may be changed.

In the present embodiment, as a specific method for changing the level of use restriction depending on the distance between the key unit 200 and the mobile terminal apparatus 100 in steps, the mobile terminal apparatus 100 includes an authentication signal level detection unit 143, a use restriction level determination unit. 125, a use restriction device 126, and a function unit 127 that can be used when authentication is established, a step-by-step prescribed value for the radio wave intensity level is set, and the distance from the key unit 200 is determined from a comparison with the prescribed value, Based on the detected distance, the level (incoming / outgoing / address / email / electronic payment) for restricting the use of the mobile terminal device 100 is changed. The level of usage restriction and the contents of the usage restriction can be arbitrarily set, but the following control mode is adopted in consideration of the importance of security and function, and the usability.
(1) When the distance from the key unit 200 is 1 m away, for example, Felica Lock is performed, and when the distance is 5 m away, the call is locked and the use restriction level is changed according to the distance.
(2) Only the functions that can be kept to a minimum even if they are damaged by theft or unauthorized use are turned on. For example, the electronic payment function or the like can be used only when the distance from the mobile terminal device 100 is the shortest, that is, the mobile terminal device 100 is close to the person. On the other hand, the function capable of receiving only calls is assumed when the mobile terminal device 100 is away from the user, that is, in a place where the eyes are difficult to reach. These functions that can only receive calls are considered to be less damaged even if they are illegally used, so these functions can be used even at a distance. Furthermore, when the authentication is not established, the use restriction level of the device is set so that a part of all the functions of the device is left.

  FIG. 3 is a diagram showing the relationship between the radio signal intensity and the use restriction level. In FIG. 3A, threshold value 1, threshold value 2 and threshold value 3 are set for the signal strength, and the received radio wave strength 350 is compared with this threshold value 1, threshold value 2 and threshold value 3. The number of these threshold values and their values can be set arbitrarily. As shown in FIG. 3 (b), when the signal strength of the received radio wave is equal to or higher than the threshold value 1, there is no usage limit level 1, and when it is equal to or higher than the threshold value 2, the usage limit level 2 (when the threshold value is equal to or higher than 1). Use restriction level 1), use restriction level 3 when threshold 3 or higher (including use restriction level 2 when threshold 2 or more), use restriction level 4 with the highest use restriction level when threshold 3 or less. It is determined. In the present embodiment, usage restriction level 1 is in electronic settlement enabled area 301 (see FIG. 2), usage restriction level 2 is in address book / mail operation enabled area 302, and usage restriction level 3 is in incoming / outgoing callable area 303. , Usage restriction level 4 is assigned to each area 304 capable of receiving only incoming calls.

  FIG. 4 is a flowchart showing the setting operation of the use restriction level. In the figure, S indicates each step of the flow.

  First, in step S1, the authentication signal level detector 143 measures the strength (level) of the authentication signal from the key unit 200. In step S2, the use restriction level determination unit 125 sets the use restriction level to the use restriction level 4. Next, in step S3, the use restriction level determination unit 125 determines whether or not the authentication signal level from the key unit 200 is greater than a prescribed threshold value 3, and if the authentication signal level is less than or equal to the threshold value 3, the process returns to step S2 and is used. Keep the restriction level at use restriction level 4. If the authentication signal level is greater than the prescribed threshold 3, the use restriction level is set to the use restriction level 3 in step S4.

  Next, in step S5, the use restriction level determination unit 125 determines whether or not the authentication signal level from the key unit 200 is greater than the prescribed threshold value 2, and if the authentication signal level is less than or equal to the threshold value 2, the process returns to step S3 to perform authentication. It is determined whether or not the signal level is greater than a prescribed threshold value 3. If the authentication signal level is larger than the prescribed threshold value 2 in step S5, the use restriction level is set to use restriction level 2 in step S6.

  Next, in step S7, the use restriction level determination unit 125 determines whether or not the authentication signal level from the key unit 200 is greater than a prescribed threshold value 1. If the authentication signal level is less than or equal to the threshold value 1, the process returns to step S5 to perform authentication. It is determined whether or not the signal level is greater than a prescribed threshold value 2. If the authentication signal level is larger than the prescribed threshold 1 in step S7, the use restriction level is set to use restriction level 1 in step S8, and this flow is terminated.

  Next, with reference to FIG. 1 to FIG. 3, the setting operation of the use restriction level depending on the distance between the mobile phone (mobile terminal device) 100 and the key unit (wireless communication unit) 200 will be described in detail.

  As shown in FIG. 15, the key unit 200 periodically transmits a search signal. The mobile terminal device 100 that has received the search signal collates the ID of the key unit 200 included in the search signal with the ID of the self (mobile terminal device 100) and responds if the ID is a combination registered in advance. Returns a signal. The key unit 200 also collates the ID of the mobile terminal device 100 included in the response signal with the ID of the self (key unit 200). Thereafter, data (authentication signal 1) obtained by encrypting a random number for authentication is transmitted from the wireless authentication unit 222 in the key unit 200 to the wireless authentication unit 122 of the mobile terminal device 100, and the mobile terminal device 100 combines the data. Authentication is performed by sending converted data (authentication signal 1 ′).

The authentication signal level detection unit 143 of the wireless authentication unit 122 of the mobile terminal device 100 detects the radio wave intensity level of the authentication signal, outputs the detection result to the use restriction level judgment unit 125, and the use restriction level judgment unit 125 receives the reception signal. The used radio wave intensity level is compared with a step-by-step specified value related to the radio wave intensity level to determine the use restriction level. An example of setting the use restriction level has been described above with reference to FIGS. Hereinafter, the operations of the key unit 200 and the mobile terminal device 100 will be described for cases where authentication is not established and authentication is established.
[If authentication is not established]
When the authentication is not established, on the key unit 200 side, the wireless authentication unit 222 sends a signal indicating that the authentication is not established to the alarm circuit unit 223. The alarm circuit unit 223 receives this signal and notifies the alarm by the external output unit 224. The external output unit 224 includes a speaker, a liquid crystal display unit, an LED, and the like, and informs the user of the mobile terminal device 100 that authentication has not been established by sounding an alarm, performing display, or turning on the light.

  On the mobile terminal device 100 side, the wireless authentication unit 122 sends an authentication failure signal to the alarm circuit unit 123. The alarm circuit unit 123 receives this signal and notifies the alarm by the external output unit 124. The external output unit 124 includes a speaker, an LCD display unit, an LED, and the like, and informs the user of the mobile terminal device 100 that the authentication has not been established by sounding an alarm, performing display, or turning on the LED.

On the other hand, the radio signal strength level detection signal of the authentication signal is sent from the authentication signal level detection unit 143 of the wireless authentication unit 122 to the use restriction level determination unit 125. The use restriction level determination unit 125 determines an optimum restriction level based on this detection signal, and sends a use restriction level setting signal to the use restriction device 126. In this case, since the signal strength of the received radio wave 350 (see FIG. 3) is so small that the authentication signal cannot be authenticated, the mobile terminal device 100 exists in the all-function unavailable area 305 shown in FIG. .
[When certification is established]
When authentication is established, the wireless authentication unit 222 sends an authentication establishment signal to the alarm circuit unit 223 on the key unit 200 side. Upon receiving this signal, the alarm circuit unit 223 may notify the user of the mobile terminal device 100 that the authentication has been established by the external output unit 224 or may not particularly notify the user. In addition, in the case of notifying the authentication establishment, it is preferable that the confirmation simple notification is provided unlike the warning in the case of the authentication failure. For example, a confirmation sound with a small volume or LED lighting.

  On the mobile terminal device 100 side, the wireless authentication unit 122 sends an authentication establishment signal to the alarm circuit unit 123. Upon receiving this authentication establishment signal, the alarm circuit unit 123 may notify the user of the mobile terminal device 100 that the authentication has been established by the external output unit 124 or may not particularly notify it. In addition, in the case of notifying the authentication establishment, it is preferable that the confirmation simple notification is provided unlike the warning in the case of the authentication failure. For example, a confirmation sound of a small volume, a symbol mark display on the LCD display unit, LED lighting, and the like.

  The notification sound or LCD display on the key unit 200 side or the mobile terminal device 100 side may be changed according to the restriction level.

  On the other hand, the radio signal strength level detection signal of the authentication signal is sent from the authentication signal level detection unit 143 of the wireless authentication unit 122 to the use restriction level determination unit 125. The use restriction level determination unit 125 determines an optimum restriction level based on this detection signal, and sends a use restriction level setting signal to the use restriction device 126. Based on an instruction (reception of a setting signal) from the use restriction level determination unit 125, the use restriction device 126 sets a restriction level indicating which function of the function unit 127 that can be used when authentication is established.

  For example, when the signal strength of the received radio wave 350 in FIG. 3 is greater than or equal to the threshold value 1, it is determined that the use restriction level is 1 without use restriction, and the restriction level 1 with no function restriction among the function units 127 usable when authentication is established. Function 131 is set. As a result, the functions in the electronic payment possible area 301 in the authentication confirmation possible area shown in FIG. 2 can be used. In this case, all the functions of the mobile terminal device 100 including the electronic payment can be used. Similarly, when the signal strength of the received radio wave 350 in FIG. 3 is greater than or equal to the threshold value 2, the function 132 of the restriction level 2 that restricts the settlement function is set out of the function units 127 that can be used when the authentication is established. Among the authentication checkable areas shown, the functions in the address book / mail operable area 30 can be used, but in this case, the electronic payment function cannot be used. Further, when the signal strength of the received radio wave 350 in FIG. 3 is smaller than the threshold 3, a restriction level 4 function 134 for restricting functions related to outgoing calls is set out of the function units 127 that can be used when authentication is established, as shown in FIG. Among the areas where authentication can be confirmed, the functions in the area where only incoming calls are possible 304 can be used.

  As described above, according to the first embodiment, the mobile terminal device 100 uses the authentication signal level detection unit 143 that detects the radio wave intensity level from the key unit 200, and compares the received radio wave intensity level with the specified value. A use restriction level judgment unit 125 for judging a restriction level and a use restriction device 126 for setting a restriction level for restricting the functions 131 to 135 of the function unit 127 that can be used when authentication is established. Since the device usage restriction level is set and the functions are restricted, each function can be used in accordance with the actual situation of use, and the usability can be greatly improved while maintaining security.

  In particular, when the distance between the key unit 200 and the mobile terminal device 100 is close, such as the user's own hand, it is assumed that the user can reach the user's eyes, and thus an electronic payment function with high security requirements. Is realized. As the distance between the key unit 200 and the mobile terminal device 100 increases, the functions are sequentially limited from functions with a high security level, such as only address / mail / outgoing / incoming calls. In addition, when authentication is not established, it is possible to set the device use restriction level so that a part of all the functions of the device is left. Therefore, it is possible to avoid the situation that all functions can be used when authentication is established / all functions cannot be used when authentication is not established, and the security level is maintained while keeping the device function usage restrictions to a minimum according to the user's usage situation. Can be further improved. In addition, the original function of wireless authentication that eliminates the troublesome operation for authentication such as fingerprint authentication, face authentication, and encryption number input can be achieved.

  In the present embodiment, a stepwise prescribed value is set for the radio wave intensity level from the key unit 200, and the distance is measured by comparison with the prescribed value to set the use restriction level. Any use restriction level may be used as long as the use restriction level of the device is set based on the distance between the devices. For example, in FIG. 1 to FIG. 3, the restriction levels are 1 to 5, but the number of restriction levels may be N (N = 1, 2, 3,...). A combination with Felica lock is also possible. For example, if the distance from the key unit is 1 m away, Felica lock is performed, and if the distance is 5 m away, the call is locked.

  Further, although the distance is measured based on the radio wave intensity level from the key unit 200, the distance measurement may be any method.

  Furthermore, it is possible to add functions such as notifying a specific person such as a key operator or a family at home that the key unit 200 or the portable terminal device 100 has been lost, or determining an upper limit of the withdrawal amount at the time of electronic settlement.

(Embodiment 2)
In the first embodiment, the use restriction level is changed depending on the distance between the key unit and the portable terminal device. The second embodiment is an example in which hysteresis is given to how to limit the use of the mobile terminal device.

  FIG. 5 is a block diagram showing a configuration of a mobile terminal device using the authentication control method according to Embodiment 2 of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals, and description of overlapping portions is omitted.

  In FIG. 5, 400 is a mobile phone (mobile terminal device) that performs wireless authentication, and 200 is a key unit (wireless communication unit) that performs bidirectional wireless communication with the mobile terminal device 400 for authentication.

  A mobile phone (mobile terminal device) 400 includes a control unit 110 that controls the entire device, a mobile phone communication unit 112 that includes an antenna 111, an antenna 121 that performs wireless communication with the key unit 200, a wireless authentication unit 122, and an alarm circuit. Unit 123, external output unit 124, authentication signal level detection unit 143, memory 401 for storing a signal level for performing a hysteresis operation, timer 402 for measuring time for performing a hysteresis operation, and a device use restriction level by the hysteresis operation A use restriction level determination unit 403 to be set, a use restriction device 126, and a function unit 127 usable when authentication is established are configured.

  The mobile terminal device 400 includes a memory 401 and a timer 402 for performing a hysteresis operation in addition to the mobile terminal device 100 of FIG. 1, and the configuration of the use restriction level determination unit 403 is different.

  The use restriction level determination unit 403 sets a plurality of threshold values related to the radio wave intensity level, and compares the received radio wave intensity level with the threshold value based on the time measured by the timer 402 stored in the memory 401 and the signal level at that time. Judgment is made by hysteresis operation to determine the use restriction level. A specific example of the hysteresis operation will be described later with reference to FIG.

  The use restriction device 126 sets a restriction level for restricting the functions 131 to 135 of the function unit 127 that can be used when authentication is established, based on an instruction from the use restriction level determination unit 403.

  The function unit 127 that can be used when the authentication is established includes a restriction level 1 function 131 without function restriction, a restriction level 2 function 132 that restricts a payment function, a restriction level 3 function 133 that restricts operations related to address books and mails, A restriction level 4 function 134 for restricting functions related to outgoing calls and a restriction level 5 function 135 for restricting all functions are provided.

  Hereinafter, an authentication control operation of the mobile terminal device configured as described above will be described.

  FIG. 6 is a diagram showing the relationship between the radio signal intensity and the use restriction level. In FIG. 6A, threshold values 1 and 2 are set for the signal intensity, and these threshold values 1 and 2 are for giving hysteresis to the operation. The received radio wave intensity 350 is first compared with a specified threshold value 2 having a low signal level, and then compared with a specified threshold value 1 having a signal level higher than the threshold value 2. As shown in FIG. 6 (a), when the signal strength 350 of the received radio wave tends to increase and becomes equal to or higher than the threshold value 2, the use restriction level is changed from the use restriction level 2 to the use restriction level 1 as shown in FIG. 6 (b). (That is, a level with no more functional restrictions). If the signal strength 350 of the received radio wave tends to increase, even if the signal strength 350 of the received radio wave exceeds the threshold value 1, this comparison result is not used and is discarded. When the signal intensity 350 of the received radio wave in a state exceeding the threshold 1 decreases to the threshold 1, the usage restriction level is changed from the usage restriction level 1 to the usage restriction level 2 as shown in FIG. (That is, a level with more functional restrictions). Therefore, the use restriction level 1 is quickly switched to the use restriction level 2 at the signal level of the threshold 1 before the signal intensity reaches the threshold 2.

  FIG. 7 is a flowchart showing the setting operation of the use restriction level. Steps that perform the same processing as the flow shown in FIG. 4 are given the same step numbers.

  First, in step S1, the authentication signal level detection unit 143 measures the strength (level) of the authentication signal from the key unit 200, and in step S11, the use restriction level determination unit 403 sets the use restriction level to the use restriction level 2. Next, in step S12, the use restriction level determination unit 4035 determines whether or not the signal level of the authentication signal from the key unit 200 has increased. If the signal level of the authentication signal has not increased, the process proceeds to step S11. Return to use restriction level 2 and keep use restriction level 2. If the signal level of the authentication signal has increased, it is determined in step S13 whether or not the signal level of the authentication signal from the key unit 200 is greater than the prescribed threshold value 2. If the authentication signal level is less than or equal to the threshold value 2, Returning to step S11, the use restriction level is kept at the use restriction level 2. If the authentication signal level is greater than the prescribed threshold value 2, the use restriction level is set to the use restriction level 1 in step S14.

  Next, in step S15, the authentication signal level detection unit 143 measures the signal level of the authentication signal from the key unit 200. In step S16, the use restriction level determination unit 403 decreases the signal level of the authentication signal from the key unit 200. If the signal level of the authentication signal has not decreased, the process returns to step S14 to keep the use restriction level at the use restriction level 1. If the signal level of the authentication signal has decreased, it is determined in step S17 whether or not the signal level of the authentication signal from the key unit 200 is smaller than a prescribed threshold value 1. If the authentication signal level is greater than or equal to the threshold value 1, Returning to step S14, the use restriction level is kept at the use restriction level 1. If the authentication signal level is smaller than the prescribed threshold value 2, the use restriction level is set to the use restriction level 2 in step S18, and this flow is terminated.

  Next, with reference to FIG. 5, the setting operation of the use restriction level depending on the distance between the mobile phone (mobile terminal device) 400 and the key unit 200 will be described. In the description of the operation of the present embodiment, the authentication operation and the operation on the key unit 200 side are the same as those in the first embodiment, and thus description thereof is omitted.

  A wireless signal for authentication is transmitted from the wireless authentication unit 222 in the key unit 200 to the wireless authentication unit 122 of the mobile terminal device 400. Authentication is performed by the wireless authentication unit 122 of the portable terminal device 400, and the authentication signal level detection unit 143 detects the signal level of the authentication signal. The authentication signal level detection unit 143 stores the time and the signal level at that time in the memory 401 based on the information of the timer 402. The use restriction level determination unit 403 grasps the transition of the signal level and notifies the use restriction device 126 of the optimum restriction level at that time. Based on an instruction from the use restriction level determination unit 403, the use restriction device 126 sets a restriction level indicating which function of the function unit 127 that can be used when authentication is established.

  Thus, the following effects can be obtained by providing hysteresis in the change of setting change of the use restriction level. That is, the user of the mobile terminal device 400 holds the key unit 200 as a bag, and the functions that can be used increase as the user approaches the key unit 200. This is the same effect as in the first embodiment. On the other hand, when the distance between the mobile terminal device 400 and the key unit 200 increases, for example, when the user of the mobile terminal device 400 moves away, the function is suddenly restricted, and thus the mobile terminal device 400 is stolen. It is effective when it is rare. This is because in general, the theft is escaping from the theft. For example, in the case of the hysteresis operation using the threshold values 1 and 2 shown in FIG. 6, the usage restriction level 1 is switched to the usage restriction level 1 at the threshold 2, and the usage restriction level 2 is switched from the usage restriction level 1 to the usage restriction level 2 instead of the threshold 2. Thus, it is possible to shift to the use restriction level 1 having a small use restriction level as soon as possible after authentication, and when the mobile terminal device 400 moves away, the function is suddenly restricted. Thus, each function can be used in accordance with the actual situation of use, and usability can be greatly improved while maintaining security.

  Any mode may be used as long as the device use restriction level is set by the hysteresis operation. In other words, any method may be used as long as it provides hysteresis to the usage restriction of the mobile terminal device. In addition, as in the first embodiment, it is needless to say that the present invention can be implemented in combination with an apparatus and a method for changing the use restriction level depending on the distance between the key unit and the portable terminal device.

  In this embodiment, the hysteresis operation is realized by the memory 401 and the timer 402, but the configuration is not limited to the memory timer as long as the hysteresis operation is performed.

  Further, the threshold interval may be uniform or non-uniform. However, when the signal strength is high, the signal level difference interval may be narrow. However, when the signal strength is low, it is preferable that the signal level difference interval is wide because level fluctuation is likely to occur due to disturbance.

(Embodiment 3)
The third embodiment is an example in which hysteresis is given to how to limit the use of the mobile terminal device. The method of setting the threshold is different from that of the second embodiment.

  The hardware configuration is the same as that shown in FIG.

  FIG. 8 is a diagram showing the relationship between the radio signal intensity and the use restriction level. In FIG. 8A, threshold values 1 and 2 are set for the signal intensity, and these threshold values 1 and 2 are for giving hysteresis to the operation. The received radio wave intensity 350 is first compared with a specified threshold value 1 having a high signal level, and then compared with a specified threshold value 2 having a signal level lower than the threshold value 1. As shown in FIG. 8 (a), when the signal strength 350 of the received radio wave tends to increase and becomes equal to or higher than the threshold value 1, the use restriction level is changed from the use restriction level 2 to the use restriction level 1 as shown in FIG. 8 (b). (That is, a level with no more functional restrictions). When the signal strength 350 of the received radio wave tends to increase, even if the signal strength 350 of the received radio wave exceeds the threshold value 2, this comparison result is not used and is discarded. When the signal intensity 350 of the received radio wave in the state exceeding the threshold 1 decreases to become the threshold 2, the use restriction level is changed from the use restriction level 1 to the use restriction level 2 as shown in FIG. (That is, a level with more functional restrictions). Therefore, the use restriction level 1 is not shifted to the use restriction level 1 until the signal strength 350 of the received radio wave reaches the threshold 1, and the use restriction level 1 is maintained until the signal intensity reaches the threshold 2 after the transition to the use restriction level 1. Will be.

  FIG. 9 is a flowchart showing the setting operation of the use restriction level. Steps that perform the same processing as the flow shown in FIG. 8 are given the same step numbers.

  First, in step S1, the authentication signal level detection unit 143 measures the strength (level) of the authentication signal from the key unit 200, and in step S11, the use restriction level determination unit 403 sets the use restriction level to the use restriction level 2. Next, in step S12, the use restriction level determination unit 403 determines whether or not the signal level of the authentication signal from the key unit 200 has increased. If the signal level of the authentication signal has not increased, the process proceeds to step S11. Return to use restriction level 2 and keep use restriction level 2. If the signal level of the authentication signal has increased, it is determined in step S21 whether or not the signal level of the authentication signal from the key unit 200 is greater than the prescribed threshold value 1. Returning to step S11, the use restriction level is kept at the use restriction level 2. If the authentication signal level is greater than the prescribed threshold value 1, the use restriction level is set to the use restriction level 1 in step S14.

  Next, in step S15, the authentication signal level detection unit 143 measures the signal level of the authentication signal from the key unit 200. In step S16, the use restriction level determination unit 403 decreases the signal level of the authentication signal from the key unit 200. If the signal level of the authentication signal has not decreased, the process returns to step S14 to keep the use restriction level at the use restriction level 1. If the signal level of the authentication signal has decreased, it is determined in step S22 whether or not the signal level of the authentication signal from the key unit 200 is smaller than the prescribed threshold value 2. Returning to step S14, the use restriction level is kept at the use restriction level 1. If the authentication signal level is smaller than the prescribed threshold value 2, the use restriction level is set to the use restriction level 2 in step S18, and this flow is terminated.

  Next, with reference to FIG. 6, the setting operation of the use restriction level according to the distance between the mobile phone (mobile terminal device) 400 and the key unit (wireless communication unit) 200 will be described. In the description of the operation of the present embodiment, the authentication operation and the operation on the key unit 200 side are the same as those in the first embodiment, and thus description thereof is omitted.

  A wireless signal for authentication is transmitted from the wireless authentication unit 222 in the key unit 200 to the wireless authentication unit 122 of the mobile terminal device 400. Authentication is performed by the wireless authentication unit 122 of the portable terminal device 400, and the authentication signal level detection unit 143 detects the signal level of the authentication signal. The authentication signal level detection unit 143 stores the time and the signal level at that time in the memory 401 based on the information of the timer 402. The use restriction level determination unit 403 grasps the transition of the signal level at and informs the use restriction device 126 of the optimum restriction level at that time. Based on an instruction from the use restriction level determination unit 403, the use restriction device 126 sets a restriction level indicating which function of the function unit 127 that can be used when authentication is established.

  Thus, the following effects can be obtained by providing the hysteresis shown in FIG. 8 to the switching of the setting change of the use restriction level. That is, even when the user of the portable terminal device 400 holds the key unit 200 in a bag or the like and is away from the bag for purpose, the use restriction is not easily applied, and the use restriction is not frequently applied, so the trouble for the user is reduced. There is an effect to.

(Embodiment 4)
The fourth embodiment is an example in which hysteresis is given to how to limit the use of the mobile terminal device, and is an example in which the second embodiment and the third embodiment are combined.

  The hardware configuration is the same as that shown in FIG.

FIG. 10 is a diagram illustrating the relationship between the radio signal intensity and the use restriction level. In FIG. 10A, threshold value 1, threshold value 2 and threshold value 3 are set for the signal intensity, and this threshold value 1, threshold value 2 and threshold value 3 are for giving hysteresis to the operation.
The received radio wave intensity 350 is first compared with a prescribed threshold value 3 (point a) having the smallest signal level, and then compared with a prescribed threshold value 1 (point b) having a signal level higher than the threshold values 2 and 3. As shown in FIG. 10A, when the signal strength 350 of the received radio wave tends to increase and becomes equal to or greater than the threshold 3, the use restriction level is changed from the use restriction level 3 to the use restriction level 2 as shown in FIG. (That is, a level with no more functional restrictions). Furthermore, when the signal strength 350 of the received radio wave tends to increase and becomes equal to or higher than the threshold value 1 (point b), the use restriction level is changed from the use restriction level 2 to the use restriction level 1 (the use restriction level is 1) as shown in FIG. No level). When the signal intensity 350 of the received radio wave in a state exceeding the threshold 1 decreases to reach the threshold 1 (point c), the use restriction level is changed from the use restriction level 1 as shown in FIG. Move to use restriction level 2. Further, when the signal strength 350 of the received radio wave decreases to the threshold value 2 (point d), the use restriction level shifts from the use restriction level 2 to the use restriction level 3 as shown in FIG. To do. In this example, the threshold value 2 (point d) is compared only when the signal strength 350 of the received radio wave decreases. Accordingly, the use restriction level 3 is switched to the use restriction level 2 quickly, while the use restriction level 1 requiring a high security level is used as soon as the signal strength 350 of the received radio wave decreases. Can be switched to. Further, if the decreasing tendency continues, the usage restriction level 3 is switched by comparison with the threshold value 2.

  FIG. 11 is a flowchart showing the setting operation of the use restriction level. Steps that perform the same processing as the flow shown in FIGS. 8 and 9 are given the same step numbers.

  First, in step S1, the authentication signal level detector 143 measures the strength (level) of the authentication signal from the key unit 200. In step S31, the use restriction level determination unit 403 sets the use restriction level to the use restriction level 3. Next, in step S32, the use restriction level determination unit 403 determines whether or not the signal level of the authentication signal from the key unit 200 has increased. If the signal level of the authentication signal has not increased, the process proceeds to step S31. Go back and keep the usage limit level at usage limit level 3. If the signal level of the authentication signal has increased, it is determined in step S33 whether the signal level of the authentication signal from the key unit 200 is greater than a prescribed threshold value 3, and if the authentication signal level is less than or equal to the threshold value 3, Returning to step S31, the use restriction level is kept at the use restriction level 3. If the authentication signal level is greater than the prescribed threshold 3, the use restriction level is set to the use restriction level 2 in step S34.

  Next, in step S35, the authentication signal level detection unit 143 measures the signal level of the authentication signal from the key unit 200, and in step S36, the use restriction level determination unit 403 increases the signal level of the authentication signal from the key unit 200. If the signal level of the authentication signal has not increased, the process proceeds to step S40. If the signal level of the authentication signal has increased in step S36, it is determined in step S37 whether or not the signal level of the authentication signal from the key unit 200 is greater than a prescribed threshold value 1, and the authentication signal level is not more than the threshold value 1. In this case, the process returns to step S34 to keep the use restriction level at the use restriction level 2. If the authentication signal level is greater than the prescribed threshold value 1, the use restriction level is set to the use restriction level 1 in step S38.

  Next, in step S39, the use restriction level determination unit 125 determines whether or not the signal level of the authentication signal from the key unit 200 has decreased. If the signal level of the authentication signal has not decreased, the process proceeds to step S38. Return to use restriction level 1 and keep use restriction level 1. If the signal level of the authentication signal has decreased, it is determined in step S40 whether or not the signal level of the authentication signal from the key unit 200 is smaller than the prescribed threshold value 1. If the authentication signal level is greater than or equal to the threshold value 1, Returning to step S38, the use restriction level is kept at the use restriction level 1. If the authentication signal level is smaller than the prescribed threshold value 1, the use restriction level is set to the use restriction level 2 in step S41.

  Next, in step S42, the use restriction level determination unit 125 determines whether or not the signal level of the authentication signal from the key unit 200 has decreased. If the signal level of the authentication signal has not decreased, the process proceeds to step S41. Return to use restriction level 2 and keep use restriction level 2. If the signal level of the authentication signal has decreased, it is determined in step S43 whether or not the signal level of the authentication signal from the key unit 200 is smaller than the prescribed threshold value 2, and if the authentication signal level is greater than or equal to the threshold value 2, Returning to step S41, the use restriction level is kept at the use restriction level 2. If the authentication signal level is smaller than the prescribed threshold value 2, the use restriction level is set to the use restriction level 3 in step S44, and this flow is terminated.

  Thus, arbitrary control becomes possible by combining hysteresis. As described in the second embodiment, when the distance between the mobile terminal device 400 and the key unit 200 increases, for example, when the user moves away, the function is suddenly limited. It is effective when stolen. Further, as described in the third embodiment, even when the user of the mobile terminal device 400 holds the key unit 200 in a bag or the like and moves away from the bag for a necessary purpose, the use is not easily restricted, and the use is frequently restricted. Since it does not take, it can have the effect of reducing the troublesomeness for the user. In addition, the terminal user can select an operation mode that emphasizes the crime prevention controlled by the hysteresis operation of the second embodiment and an operation mode that emphasizes the user-friendliness controlled by the hysteresis operation of the third embodiment on the terminal display screen. You may make it selectable.

(Embodiment 5)
Embodiment 5 is an example in which the signal level of an authentication signal from a mobile terminal device is detected by a key unit. The present invention can be applied to signal level detection in the first to fourth embodiments.

  FIG. 12 is a block diagram showing a configuration of a mobile terminal device using the authentication control method according to Embodiment 5 of the present invention. The same components as those in FIG. 5 are denoted by the same reference numerals, and description of overlapping portions is omitted.

  In FIG. 12, 500 is a mobile phone (mobile terminal device) that performs wireless authentication, and 600 is a key unit (wireless communication unit) that performs bidirectional wireless communication with the mobile terminal device 500 for authentication.

  In the mobile phone (mobile terminal device) 500, the wireless authentication unit 501 includes a signal level information receiving unit 502 instead of the authentication signal level detecting unit 143 (FIG. 5).

  The key unit 600 includes an authentication signal level detection unit 602 in which the wireless authentication unit 601 detects a radio wave intensity level from the mobile terminal device 500.

  The wireless authentication unit 601 of the key unit 600 and the wireless authentication unit 501 of the mobile terminal device 500 are configured by a communication module that performs bidirectional wireless communication with low power consumption using, for example, a weak wireless frequency band of 300 MHz band.

  Hereinafter, an authentication control operation of the mobile terminal device configured as described above will be described.

  A wireless signal for authentication is transmitted from the wireless authentication unit 501 of the portable terminal device 500 to the wireless authentication unit 601 of the key unit 600. The authentication signal level detection unit 602 of the wireless authentication unit 601 of the key unit 600 detects the level of the authentication signal. Thereafter, the signal level information is transmitted from the key unit 600 to the mobile terminal device 500, and the signal level information receiving unit 502 of the mobile terminal device 500 detects the level of the authentication signal. The signal level information receiving unit 502 stores the time and the signal level at that time in the memory 401 based on the information of the timer 402. The use restriction level determination unit 403 grasps the transition of the signal level and notifies the use restriction device 126 of the optimum restriction level at that time. Based on an instruction from the use restriction level determination unit 403, the use restriction device 126 sets a restriction level as to which function of the function unit 127 that can be used when authentication is established is restricted.

  In this way, the signal level of the authentication signal from the mobile terminal device 500 is detected by the key unit 600, and the detected signal level is transmitted to the mobile terminal device 500. The present invention can be applied to signal level detection in the first to fourth embodiments. In addition, since the mobile terminal device side does not have a signal level detection function, it is suitable for use when the configuration of the mobile terminal device is not changed or cannot be changed.

  The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this. For example, an example in which the present invention is applied to a mobile phone as a mobile terminal device has been described. However, the mobile terminal is not limited to a mobile phone, and a portable information terminal such as a PDA, a personal computer or a combined device thereof, and a portable device such as an MP3 player or an HDD player. Applicable to equipment.

  Further, the use restriction level setting examples in FIGS. 2, 3, 6, 8, and 10 are merely examples, and any setting examples may be used.

  In the present embodiment, the names of the mobile terminal device and the authentication control method are used. However, this is for convenience of explanation, and it is of course possible to use a mobile phone, a device use restriction device, a wireless authentication method, or the like. It is.

  Further, the types, numbers, connection methods, and the like of each circuit unit, for example, a wireless authentication unit, which constitute the mobile terminal device and the wireless communication unit are not limited to the above-described embodiments.

  Further, the mobile terminal device and the authentication control method described above are also realized by a program for causing the mobile terminal device and the authentication control method to function. This program is stored in a computer-readable recording medium.

  INDUSTRIAL APPLICABILITY The mobile terminal device and authentication control method according to the present invention are useful for mobile terminal devices such as mobile phones that perform wireless authentication by transmitting and receiving wireless signals to and from the wireless communication unit, and authentication control system applications. Further, the authentication control program can be incorporated into a mobile device such as a mobile phone.

1 is a block diagram showing a configuration of a mobile terminal device according to Embodiment 1 of the present invention. The figure explaining the basic concept of the authentication control method of the portable terminal device which concerns on the said Embodiment 1. FIG. The figure which shows the relationship between the electromagnetic wave signal strength of the portable terminal device which concerns on the said Embodiment 1, and a use restriction level. The flowchart which shows the setting operation | movement of the use restriction level of the portable terminal device which concerns on the said Embodiment 1. The block diagram which shows the structure of the portable terminal device which concerns on Embodiment 2 of this invention. The figure which shows the relationship between the radio signal strength of the portable terminal device which concerns on the said Embodiment 2, and a use restriction level. The flowchart which shows the setting operation | movement of the use restriction level of the portable terminal device which concerns on the said Embodiment 2. FIG. The figure which shows the relationship between the electromagnetic wave signal strength of the portable terminal device which concerns on Embodiment 3 of this invention, and a use restriction level. The flowchart which shows the setting operation | movement of the use restriction level of the portable terminal device which concerns on the said Embodiment 3. FIG. The figure which shows the relationship between the electromagnetic wave signal strength of the portable terminal device which concerns on Embodiment 4 of this invention, and a use restriction level. The flowchart which shows the setting operation | movement of the use restriction level of the portable terminal device which concerns on the said Embodiment 4. FIG. The block diagram which shows the structure of the portable terminal device which concerns on Embodiment 5 of this invention. The figure explaining the use restriction method which places a use restriction on a portable terminal device using wireless authentication communication The block diagram which implement | achieves the usage restriction method of the portable terminal device of FIG. Control sequence diagram showing operation of wireless authentication The figure which shows the combination of a portable terminal device and a wireless communication unit

Explanation of symbols

100, 400, 500 Mobile phone (mobile terminal device)
DESCRIPTION OF SYMBOLS 110 Control part 111,121,221 Antenna 112 Cell-phone communication part 113 Transmission / reception switching part 114 Transmission part 115 Reception part 122,222,501,601 Wireless authentication part 123,223 Alarm circuit part 124,224 External output part 140,230 Transmission / reception Unit 141, 231 Authentication ID storage unit 142 Wireless authentication control unit 143 Authentication signal level detection unit 125, 403 Usage restriction level judgment unit 126 Usage restriction device 127 Function unit available when authentication is established 131 Function level restriction without function restriction 131 Function 132 Function of restriction level 2 that restricts payment function 133 Function of restriction level 3 that restricts operations related to address book and mail 134 Function of restriction level 4 that restricts functions related to outgoing call 135 Function of restriction level 5 that restricts all functions Function 200,600 Key unit G (wireless communication unit)
225 Battery 232 Wireless communication unit control unit 401 Memory 402 Timer 502 Authentication signal level reception unit 602 Authentication signal level detection unit

Claims (15)

Wireless authentication means for performing wireless authentication by transmitting and receiving wireless signals to and from the wireless communication unit;
Distance measuring means for measuring a distance between the wireless communication unit;
Use restriction level setting means for setting a use restriction level of the device based on the measured distance;
A portable terminal device comprising: device function restriction means for restricting the function of the device according to a set use restriction level. Wireless authentication means for performing wireless authentication by transmitting and receiving wireless signals to and from the wireless communication unit;
When the authentication by the wireless authentication unit is not established, a use restriction level setting unit that sets a use restriction level of the device so as to leave a part of all functions of the device;
A portable terminal device comprising: device function restriction means for restricting the function of the device according to a set use restriction level. Wireless authentication means for performing wireless authentication by transmitting and receiving wireless signals to and from the wireless communication unit;
Usage limit level setting means for setting the usage limit level of the device by hysteresis operation,
A portable terminal device comprising: device function restriction means for restricting the function of the device according to a set use restriction level. Furthermore, it comprises a distance measuring means for measuring the distance between the wireless communication unit,
The use restriction level setting means includes:
The portable terminal device according to claim 3, wherein a use restriction level of the device is set by the measured distance and hysteresis operation.   The portable terminal device according to claim 1, wherein the distance measuring unit measures a distance based on a signal strength of a radio signal. The use restriction level setting means includes:
The level setting according to any one of claims 1 to 3, comprising at least one of a restriction level without function restriction, a restriction level for restricting some functions, and a restriction level for restricting all functions. Mobile terminal device. The use restriction level setting means includes:
The portable terminal device according to any one of claims 1 to 3, comprising at least one of a level setting of an electronic payment function restriction level, a mail operation function restriction level, a transmission function restriction level, or an incoming call permission level. The use restriction level setting means includes:
The portable terminal device according to any one of claims 1 to 3, wherein the use restriction level is reduced as a distance from the wireless communication unit approaches. The use restriction level setting means includes:
The portable terminal device according to any one of claims 1 to 3, wherein the use restriction level of a function having a high security level is increased as a distance from the wireless communication unit is increased. An authentication control method for performing wireless authentication by transmitting and receiving a wireless signal between a wireless communication unit and a use restriction releasing unit in a mobile terminal device,
Measuring a distance between the wireless communication unit and the mobile terminal device;
Setting a use restriction level of the mobile terminal device based on the measured distance;
An authentication control method comprising: limiting a function of the mobile terminal device according to a set use restriction level. An authentication control method for performing wireless authentication by transmitting and receiving a wireless signal between a wireless communication unit and a use restriction releasing unit in a mobile terminal device,
When the authentication is not established, setting a use restriction level so as to leave a part of all the functions of the mobile terminal device; and
An authentication control method comprising: limiting a function of the mobile terminal device according to a set use restriction level. An authentication control method for performing wireless authentication by transmitting and receiving a wireless signal between a wireless communication unit and a use restriction releasing unit in a mobile terminal device,
Setting a use restriction level of the mobile terminal device by a hysteresis operation;
An authentication control method comprising: limiting a function of the mobile terminal device according to a set use restriction level.   An authentication control method for performing wireless authentication by transmitting and receiving wireless signals between a wireless communication unit and a use restriction releasing unit in a mobile terminal device, and measuring a distance between the wireless communication unit and the mobile terminal device A program for causing a computer to execute a step, a step of setting a use restriction level of the mobile terminal device based on the measured distance, and a step of restricting the function of the mobile terminal device according to the set use restriction level .   An authentication control method for performing wireless authentication by transmitting and receiving a wireless signal between a wireless communication unit and a use restriction releasing unit in a mobile terminal device, and when the authentication is not established, one of all functions of the mobile terminal device A program for causing a computer to execute a step of setting a use restriction level so as to leave a part and a step of restricting the function of the mobile terminal device according to the set use restriction level. An authentication control method for performing wireless authentication by transmitting and receiving wireless signals between a wireless communication unit and a use restriction releasing unit in a mobile terminal device, the step of setting a use restriction level of the mobile terminal device by a hysteresis operation; A program for causing a computer to execute a step of restricting the function of the mobile terminal device according to a set use restriction level.

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