JP2006304157A - Mobile terminal and theftproof method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal and a theftproof method thereof capable of preventing mobile terminal lifting or like act from taking place in the case that the mobile terminal is left behind. <P>SOLUTION: A distance discriminator 102 of the mobile terminal 11 discriminates a distance from a wireless terminal 2 carried by a possessor. When an acceleration monitor 104 and an operation monitor 105 detect that the mobile terminal is carried or receives any operation when the discriminator 102 discriminates that the distance between the mobile terminal 11 and the wireless terminal 2 is a prescribed distance or over, an operation control unit 103 activates at least one of a vibration generator 106, a sound generator 107, a light generator 108, and a display generator 109 to raise warning. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a portable terminal device and a theft prevention method thereof.

  In recent years, mobile terminals such as mobile phones have a high risk of being lost in terms of personal information and electronic currency due to high functionality in recent years, and are often carried around, so they are often misplaced and often stolen. For this reason, in cooperation with a wireless device different from the portable terminal, when the distance between the portable terminal and the wireless device is far and it is determined that the portable terminal is left behind, an alarm signal is issued or the portable terminal is sent to a predetermined communication destination. It has been proposed to transmit the ID and position information (see, for example, Patent Document 1 and Patent Document 2).

Japanese Patent Laid-Open No. 11-88499 JP 2003-348659 A

  However, in the conventional portable terminal device, although an alarm signal is generated when the user is away from the owner, countermeasures against taking away the portable terminal device are not taken. There was no such situation.

  The present invention has been made in view of the above-described conventional circumstances, and an object of the present invention is to provide a portable terminal device capable of preventing the portable terminal device from being left behind and the like and a method for preventing theft thereof. And

  The portable terminal device according to the present invention includes a distance detection unit that detects a distance from a position indicating the owner, an operation detection unit that detects an operation applied from the outside, and a distance detected by the distance detection unit is a predetermined distance. In addition, an execution unit that executes a function designated in advance when a predetermined operation is detected by the operation detection unit.

  With this configuration, when the user is away from the owner, a function designated in advance for the operation applied to the mobile terminal device is executed, so that theft such as mischief or removal can be prevented.

  Further, in the portable terminal device of the present invention, the distance detecting means includes radio wave detecting means for detecting a radio signal transmitted from a transmitting terminal apparatus that transmits a radio signal indicating the owner, and the detected signal is included in the detected signal. Detect the distance based on.

  With this configuration, the distance can be detected by a radio signal transmitted from the radio transmission terminal device.

  In the mobile terminal device of the present invention, the motion detection unit includes a movement detection unit that detects the movement of the mobile terminal device as the predetermined operation.

  With this configuration, it is possible to detect that the portable terminal device has been carried away from the owner.

  The portable terminal device of the present invention further includes an operation input unit that receives an operation input, and the operation detection unit includes an operation input detection unit that detects an operation input to the operation input unit as the predetermined operation. Have.

  With this configuration, it is possible to detect that the mobile terminal device has been operated in a state away from the owner.

  Further, the mobile terminal device of the present invention further includes alarm generation means for generating an alarm by at least one of voice, vibration, light emission, and display, and the execution means generates the alarm as the designated operation. Alarm generation by means is executed.

  With this configuration, an alarm is generated when a predetermined action is added in a state of being away from the owner, so that it is possible to urge the person who added the action to stop the action.

  Moreover, the portable terminal device of the present invention further includes an imaging unit that captures an image, and the execution unit executes the operation of the imaging unit as the previously specified operation.

  With this configuration, it is possible to capture the person who has taken away or an image serving as the clue.

  The portable terminal device of the present invention further includes an image display unit that displays an image captured by the imaging unit, and a face recognition unit that recognizes a person's face from the image captured by the imaging unit, The execution means displays the captured image on the image display means when the face recognition means recognizes a human face.

  With this configuration, since it is possible to recognize that the person who has added the action has been photographed, it is possible to prompt the user to stop the action of adding the action.

  The portable terminal device according to the present invention includes an image storage unit that stores an image captured by the imaging unit, and the captured image when a distance detected by the distance detection unit is equal to or less than a predetermined distance. And image erasing means for erasing the image.

  With this configuration, it is possible to protect the privacy of a person who has no intention of theft or the like.

  In addition, the mobile terminal device of the present invention transmits the image captured by the imaging unit to a predetermined transmission destination.

  With this configuration, the person who has taken away or an image that serves as a clue is transmitted to the outside, so that the image can be confirmed even when the portable terminal device is stolen and cannot be found.

  The anti-theft method of the present invention is an anti-theft method for a mobile terminal device, the step of detecting a distance from a position indicating the owner, the step of detecting an operation applied to the mobile terminal device from the outside, Executing a function of the portable terminal device designated in advance when the distance detected by the distance detecting means is equal to or greater than a predetermined distance and when the predetermined action is detected by the action detecting means.

  By this method, when the user is away from the owner, the function designated in advance for the operation applied to the portable terminal device is executed, so that theft such as mischief or removal can be prevented.

  According to the present invention, it is possible to provide a mobile terminal device capable of preventing the mobile terminal device from being left behind and the like and a method for preventing theft thereof.

(First embodiment)
FIG. 1 is a block diagram showing the configuration of a theft prevention system for a portable terminal device according to the first embodiment of the present invention. In the first embodiment, an alarm operation is performed by vibration, sound, light, and display generation in response to a portable terminal device being taken away or an operation input.

  As shown in FIG. 1, this system is a mobile phone 11 that is an example of a mobile terminal device, and a wireless terminal that can communicate wirelessly with the mobile phone 11, and is owned by being carried by the owner of the mobile phone 11. And a small wireless device 2 for indicating the position of the person.

  The mobile phone 11 includes a wireless communication unit 101, a distance determination unit 102, an operation control unit 103, an acceleration monitoring unit 104, an operation monitoring unit 105, a vibration generation unit 106, a sound generation unit 107, and a light generation unit. 108 and a display generation unit 109.

  The wireless communication unit 101 performs wireless communication with the small wireless device 2, and transmits and receives an ID and other information for identifying a communication partner using a radio frequency and a modulation / demodulation method paired with the small wireless device 2. The distance determination unit 102 determines the distance between the mobile phone 11 and the small wireless device 2 from the radio wave state such as the electric field strength and error rate of the wireless signal acquired by the wireless communication unit 101. The determined distance information is output to the operation control unit 103.

  The operation control unit 103 controls the operation of the mobile phone 11 based on the distance information determined by the distance determination unit 102. Specifically, when the mobile phone 11 is away from a certain distance, a vibration generation unit 106 such as a vibrator, a buzzer, an alarm, a shutter sound, a sound generation unit 107 having a sound source and a speaker, and a light generation having a flash are generated. The alarm generation unit having the display generation unit 109 for displaying characters and images performs a notification operation with an alarm such as vibration, sound, light, or a predetermined display. Moreover, you may perform function restrictions, such as the transmission operation | movement of the mobile telephone 11, a telephone directory browsing, a stored image browsing, a power supply OFF, as needed.

  In the present embodiment, when the distance determination unit 102 determines that the distance from the small wireless device 2 is more than a certain distance to the operation control unit 103, the operation control unit 103 functions the mobile phone 11 differently from the normal time. Switch to a restricted state (set to misplaced mode). In this misplacement mode, the mobile phone 11 has been moved (carried) by the acceleration monitoring unit 104 and the operation monitoring unit 105 such as an acceleration sensor, or an operation input unit (not shown) such as a key or a switch has been operated ( An alarm using any one or more of the above sound, vibration, light, and display. A speed sensor or the like may be provided instead of the acceleration monitoring unit 104. In other words, any means that can detect movement or carrying is possible.

  Further, the small wireless device 2 is provided with a wireless communication unit 201 that performs wireless communication with the mobile phone 11 and a distance determination unit 202 that determines the distance between the mobile phone 11 and the wireless communication unit 201. The small wireless device 2 is carried by the owner of the mobile phone 11, and the wireless communication unit 201 uses an ID and other information for identifying a communication partner using a radio frequency and a modulation / demodulation method paired with the mobile phone 11. Send and receive each other. The distance determination unit 202 can determine the distance from the mobile phone 11 based on the wireless communication unit 201 and the terminal ID that are paired with the mobile phone 11 and can perform an alarm operation for the owner. That is, the distance from the mobile phone 11 is determined from the radio wave intensity acquired by the wireless communication unit 201 and the radio wave state such as a transmission error, and when the distance exceeds a predetermined distance, alarm means (not shown) (sound, vibrator, etc.) ) Warn the owner.

  FIG. 2 is a flowchart illustrating a theft prevention method for the mobile terminal device according to the first embodiment. When the mobile phone 11 is turned on and the small wireless device 2 is turned on (step S1), the wireless communication unit 101 and the distance determining unit 102 operate to perform wireless communication with the small wireless device 2. The distance determination unit 102 of the small wireless device 2 detects the distance between the mobile phone 11 and the small wireless device 2 from the radio wave state such as the electric field strength and transmission error rate of the wireless signal acquired by the wireless communication unit 101, It is determined whether a distance (for example, 2 m in this embodiment) or more is left (step S2).

  When the distance determination unit 102 notifies the operation control unit 103 that the distance between the mobile phone 11 and the small wireless device 2 has been determined to be 2 m or more by performing such a distance determination, the operation control unit 103 The telephone 11 is switched to a state in which functions different from normal ones are restricted (misplaced mode) (step S3).

  In the misplaced mode, the acceleration monitoring unit 104 and the operation monitoring unit 105 detect that the mobile phone 11 has been moved or operated (steps S4 and S5). The acceleration monitoring unit 104 monitors whether the mobile phone 11 has been misplaced and moved from a stationary state or has been moved by the acceleration sensor, and outputs a detection signal to the operation control unit 103. The operation monitoring unit 105 monitors operations on all the key buttons and the open / close switch provided in the mobile phone 11 and outputs a detection signal to the operation control unit 103.

  When the movement or operation of the mobile phone 11 is detected during the misplacement mode, the operation control unit 103 selects one or more of the vibration generation unit 106, the sound generation unit 107, the light generation unit 108, and the display generation unit 109. Is activated to generate a warning (step S8). If the distance between the mobile phone 11 and the small wireless terminal 2 is less than 2 m (step S6), the operation control unit 103 switches the function of the mobile phone 11 to the normal mode (step S7).

  According to the first embodiment of the present invention, when the mobile phone 11 is left behind or the like, it is possible to prompt the user to stop the action by issuing an alarm when the mobile phone 11 is carried or operated. .

(Second Embodiment)
FIG. 3 is a block diagram showing the configuration of a theft prevention system for portable terminals according to the second embodiment of the present invention. Portions that overlap with FIG. 1 described in the first embodiment are denoted by the same reference numerals. In the second embodiment, an alarm operation by displaying a camera image is performed for taking away a portable terminal device or an operation input.

  As shown in FIG. 3, the mobile phone 12 according to the present embodiment includes a wireless communication unit 101, a distance determination unit 102, an operation control unit 103, an acceleration monitoring unit 104, an operation monitoring unit 105, an image recording unit 110, and an image acquisition. Unit 111, image display unit 112, and face recognition unit 113.

  The image acquisition unit 111 is a device that captures an image such as a camera. The image acquisition unit 111 records an image captured by the camera in the image recording unit 110 and displays the captured image on the image display unit 112. The face recognition unit 113 recognizes whether a person's face is photographed from the photographed image.

  FIG. 4 is a flowchart illustrating a portable terminal theft prevention method according to the second embodiment. Note that determination of the state in which the mobile phone 12 is misplaced and switching to the misplacement mode (steps S1 to S7) in the present embodiment are the same as in the first embodiment, and thus description thereof is omitted.

  In the misplaced mode, when the acceleration monitoring unit 104 and the operation monitoring unit 105 detect that the mobile phone 12 has been moved or operated, the operation control unit 103 activates the image acquisition unit 111 to automatically shoot. Is performed (step S11).

  The face recognition unit 113 determines whether a face has been shot by image processing (step S12). If the face can be recognized (YES in step S12), the captured image is recorded in the image recording unit 110 (step S13), and the captured image is displayed on the image display unit 112 (step S14).

  On the other hand, if the face cannot be recognized (NO in step S12), the photographed image is recorded in the image recording unit 110 (step S15), and the image display unit 112 is clearly marked as photographed (step S16).

According to the second embodiment of the present invention, when the mobile phone 12 is left behind or the like, it is possible to prompt the user to stop the action by taking an image when the mobile phone 12 is carried or operated. Become.
(Third embodiment)

  FIG. 5 is a block diagram showing the configuration of a portable terminal antitheft system according to the third embodiment of the present invention. In the third embodiment, an alarm operation based on vibration, sound, light, display generation, and camera image display is performed against theft of the mobile terminal. As shown in FIG. 5, the mobile phone 13 of this embodiment is a combination of the first embodiment and the second embodiment described above, and in the first embodiment and the second embodiment. 1 and 3 described above are denoted by the same reference numerals. Note that the display generation unit 109 and the image display unit 112 may share the same display device.

  FIG. 6 is a flowchart illustrating a portable terminal theft prevention method according to the third embodiment. The determination of the state in which the mobile phone 13 is misplaced and the switching to the misplacement mode (steps S1 to S7) are the same as those in the first and second embodiments, and thus description thereof is omitted.

  In the misplaced mode, when it is detected that the mobile phone 13 has been moved or operated by the acceleration monitoring unit 104 and the operation monitoring unit 105, the operation control unit 103 detects the vibration generation unit 106, the sound generation unit 107, and the light generation. At least one of the unit 108 and the display generation unit 109 is activated to generate a warning (step S8), and at the same time, the image acquisition unit 111 is activated to automatically capture an image (step S11).

  The face recognition unit 113 determines whether a face has been shot by image processing (step S12). If the face can be recognized (YES in step S12), the captured image is recorded in the image recording unit 110 (step S13), and the captured image is displayed on the image display unit 112 (step S14).

  On the other hand, if the face cannot be recognized (NO in step S12), the photographed image is recorded in the image recording unit 110 (step S15), and the image display unit 112 is clearly marked as photographed (step S16).

According to the third embodiment of the present invention, when the mobile phone 13 is left behind or the like, an alarm is generated when the mobile phone 13 is carried or operated, and the action is stopped by capturing an image. It becomes possible to prompt.
(Fourth embodiment)

  FIG. 7 is a block diagram showing the configuration of a portable terminal anti-theft system according to the fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the part which overlaps FIG.1, FIG.3, FIG.5 demonstrated in 1st thru | or 3rd embodiment. In the fourth embodiment, the camera image is automatically deleted after the above-described alarm operation for theft of the portable terminal.

  As shown in FIG. 7, the mobile phone 14 of the present embodiment is acquired by the image acquisition unit 111 and recorded in the image recording unit 110 when operated and moved with the distance from the wireless terminal 2 being a predetermined distance or more. An image erasure unit 114 is provided for erasing the recorded image when it is determined that the recorded image has returned to a distance less than a predetermined distance from the wireless terminal 2.

  FIG. 8 is a flowchart showing a portable terminal theft prevention method according to the fourth embodiment. The determination of the state in which the mobile phone 14 is misplaced and the switching to the misplacement mode (steps S1 to S3) are the same as in the above-described embodiment, and thus the description thereof is omitted.

  In the misplaced mode, when it is detected that the mobile phone 14 has been moved or operated by the acceleration monitoring unit 104 and the operation monitoring unit 105 (YES in steps S4 and S5), the operation control unit 103 causes the vibration generating unit 106 to operate. At least one of the sound generation unit 107, the light generation unit 108, and the display generation unit 109 is activated to generate a warning (step S8), and at the same time, the image acquisition unit 111 is activated to automatically capture an image (step S8). S11).

  The face recognition unit 113 determines whether a face has been shot by image processing (step S12). If the face can be recognized (YES in step S12), the photographed image is recorded in the image recording unit 110 (step S13), and the photographed image is erased together with the photographed image by returning the mobile phone 14 to the original state. The image is displayed on the image display unit 112 (step S23).

  On the other hand, if the face cannot be recognized (NO in step S12), the captured image is recorded in the image recording unit 110 (step S15), and the mobile phone 14 is returned to the image display unit 112 together with the fact that the image has been captured. A message to delete the captured image is displayed on the image display unit 112 (step S16).

  In the misplaced mode, the mobile phone 14 moves or is not detected by the acceleration monitoring unit 104 and the operation monitoring unit 105 (NO in steps S4 and S5), and the owner returns to the mobile phone 14 that has been misplaced. When the distance determination unit 102 detects that the distance from the small wireless device 2 is less than 2 m (NO in step S6), the operation control unit 103 determines whether there is an image recorded in the image recording unit 110. Determination is made (step S21).

  If no image is recorded (NO in step S21), the process proceeds to step S7. On the other hand, when an image is recorded (YES in step S21), the operation control unit 103 activates the image deletion unit 114 to delete the image data recorded in the image recording unit 110 (step S22). Then, the operation mode of the mobile phone 14 is switched from the misplaced mode to the normal mode (step S7).

  According to the fourth embodiment of the present invention as described above, by deleting an image of a person or the like that is not intended to be taken away, the privacy of the person can be protected.

(Fifth embodiment)
FIG. 9 is a block diagram showing a configuration of a portable terminal anti-theft system according to the fifth embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the part which overlaps FIG.1, FIG.3, FIG.5, FIG.7 demonstrated in 1st-4th embodiment.

  The system according to the present embodiment includes a base station 3 and an authentication station / image management center 4 in addition to the mobile phone 15 and the small wireless device 2, and after the image acquired by the mobile phone 15 is encrypted, the destination registered in advance It transmits to the certificate authority / image management center 4 via the base station 3.

  The mobile phone 15 includes an image encryption unit 115, a transmission data creation unit 116, a destination storage unit 117, a public key storage unit 118, and a wireless communication unit 119 that performs wireless communication with the wireless communication unit 301 of the base station 3. It has been.

  The image encryption unit 115 encrypts the image data with the public key stored in the public key storage unit 118. This encrypted image data cannot be restored without the secret key generated in pair with the public key. The transmission data creation unit 116 creates terminal data by adding terminal identification information to the encrypted image data, and outputs the transmission data to the wireless communication unit 119. The destination storage unit 116 stores a destination for automatically transmitting the encrypted acquired image. The destination input may be manual input or may be acquired via the wireless communication unit 119.

  The public key storage unit 118 stores the public key generated for each mobile phone in the certificate authority / image management center 4 in the mobile phone 15. The wireless communication unit 119 is a wireless communication unit for performing voice calls, videophone calls, mail transmission / reception, and homepage browsing as the mobile phone 15, and performs communication with a mobile phone base station and a wireless LAN access point.

  The base station 3 is a mobile phone base station or a wireless LAN access point, and includes a wireless communication unit 301 with the mobile phone 15. The wireless communication unit 301 is a wireless communication unit for performing voice calls, videophone calls, mail transmission / reception, and homepage browsing with the mobile phone 15.

  The certificate authority / image management center 4 includes a mobile phone registration unit 401, an encryption key generation unit 402, a registration information recording unit 403, an image input unit 404, an image recording unit 405, and an image restoration unit 406.

  A mobile phone registration unit 401 registers a mobile phone. The encryption key generation unit 402 generates a secret key and a public key that are paired for each registered mobile phone. The registration information recording unit 403 records the generated secret key and public key for each mobile phone.

  The mobile phone registration unit 401 may have a Web server, for example, and may perform a registration procedure directly from the mobile phone 15. In this case, the terminal identification information is obtained from the mobile phone 15 to generate a secret key / public key unique to the terminal, and the terminal identification information, the secret key and the public key are recorded. At the same time, a public key is output to the mobile phone 15, and the mobile phone 15 acquires and stores the public key.

  The certificate authority / image management center 4 also includes an image input unit 404 that inputs an image transmitted from the mobile phone 15, an image recording unit 405 that records an image, and an image restoration unit 406 that restores an image. Yes.

  In this embodiment, the image encryption unit 115 encrypts the acquired image with a public key stored in advance. Then, information for identifying the mobile phone 15 is added to the encrypted image data, and the information is transmitted to the destination stored in the destination storage unit 117 via the wireless communication unit 119.

  At this time, face recognition processing may be performed in the image taken at the time of image acquisition, and the above-described series of operations may be repeated until the face is recognized, and the image with the face recognized may be displayed and transmitted. In addition, when the owner returns again after a certain distance or more and the distance between the mobile phone 15 and the small wireless device 2 approaches within a certain distance, the distance between the mobile phone 15 and the small wireless device 2 is separated by a certain distance. The image acquired in the state is erased.

  Here, acquisition of the public key of the mobile phone 15 will be described. First, the mobile phone 15 accesses the mobile phone registration unit 401 in the certificate authority / image management center 4 to perform registration. At the time of registration, the mobile phone registration unit 401 acquires from the mobile phone 15 restored image destination information and information for identifying the mobile phone 15.

  When the secret key and the public key are generated by the encryption key generation unit 402, the mobile phone identification information, the restored image destination information, and the secret key are recorded from the secret key and the public key to the registration information recording unit 403, and at the same time, encrypted with the public key. The destination information of the received image is transmitted to the mobile phone 15. In the mobile phone 15, the received public key is stored in the public key storage unit 118 and the destination information of the encrypted image is stored in the destination storage unit 117. When the mobile phone 15 receives the public key at the wireless communication unit 119, the mobile phone 15 stores the public key in the public key storage unit 118.

  FIG. 10 is a flowchart showing an example of a portable terminal theft prevention method according to the fifth embodiment. Since the determination of the state in which the mobile phone 15 is misplaced, the switching to the misplacement mode, the alarm, and the imaging (steps S1 to S5, S8, and S11) are the same as those in the above-described embodiment, the description thereof is omitted.

  When an image is captured in step S11, the face recognition unit 113 determines whether a face is captured by image processing (step S12). If the face can be recognized (YES in step S12), the captured image is recorded in the image recording unit 110 (step S13), and the captured image is erased together with the captured image by returning the mobile phone 15 to the original state. The image display unit 112 displays that the image is to be transmitted to the certificate authority / image management center 4 (step S33).

  On the other hand, if the face cannot be recognized (NO in step S12), the captured image is recorded in the image recording unit 110 (step S15), and the image display unit 112 is returned to the original state along with the fact that the image has been captured. The fact that the captured image is to be deleted and the fact that the image is to be transmitted to the certificate authority / image management center 4 are displayed on the image display unit 112 (step S34).

  Next, the image encryption unit 115 encrypts the acquired image with a public key stored in advance (step S35). Then, information for identifying the mobile phone 15 is added to the encrypted image data, and the wireless communication unit 119 transmits the image data to the destination stored in the transmission destination storage unit 117 via the base station 3 ( Step S36).

  When the transmission of the image data is completed, a message to the effect of transmission is displayed on the image display unit 112 (step S37). At this time, a captured image or a message indicating that the image has been captured may be displayed together with a message that the captured image is deleted if the mobile phone 15 is returned to the original state.

  In the misplaced mode, the mobile phone 15 is moved or no operation is detected by the acceleration monitoring unit 104 and the operation monitoring unit 105 (NO in steps S4 and S5), and the owner returns to the mobile phone 15 that has been misplaced. When the distance determination unit 102 detects that the distance from the small wireless device 2 is less than 2 m (NO in step S6), the operation control unit 103 determines whether there is an image recorded in the image recording unit 110. Determination is made (step S31).

  If no image is recorded (NO in step S31), the process proceeds to step S7. On the other hand, when an image is recorded (YES in step S31), the operation control unit 103 activates the image deletion unit 114 to delete the image data recorded in the image recording unit 110, and at the same time, the wireless communication unit From 119, to the certification authority / image management center 4 that is the destination automatically transmitted via the base station 3 (the destination stored in the destination storage unit 117), together with information for identifying the mobile phone 15, the image data Deletion is requested (step S32). Then, the operation mode of the mobile phone 15 is switched from the misplaced mode to the normal mode (step S7).

  FIG. 11 is a flowchart illustrating another example of the portable terminal theft prevention method according to the fifth embodiment. Parts that are the same as those in FIG. In this example, an image is transmitted to the certificate authority / image management center 4 and then displayed on the image display unit 112.

  When an image is captured in step S11, the face recognition unit 113 determines whether a face is captured by image processing (step S12). If the face can be recognized (YES in step S12), the captured image is recorded in the image recording unit 110 (step S13). Next, the image encryption unit 115 encrypts the acquired image with a public key stored in advance (step S35). Then, information for identifying the mobile phone 15 is added to the encrypted image data, and the wireless communication unit 119 transmits the image data to the destination stored in the transmission destination storage unit 117 via the base station 3 ( Step S36). Then, together with the photographed image, a message is displayed on the image display unit 112 that the photographed image is deleted if the cellular phone 15 is returned to its original state, and that the image is transmitted to the certificate authority / image management center 4 (step S38).

  On the other hand, when the face cannot be recognized (NO in step S12), the captured image is recorded in the image recording unit 110 (step S15). Next, the image encryption unit 115 encrypts the acquired image with a public key stored in advance (step S35). Then, information for identifying the mobile phone 15 is added to the encrypted image data, and the wireless communication unit 119 transmits the image data to the destination stored in the transmission destination storage unit 117 via the base station 3 ( Step S36). The image display unit 112 displays on the image display unit 112 that the image has been photographed and that the captured image will be deleted if the mobile phone 15 is returned to its original state and that the image has been transmitted to the certificate authority / image management center 4. (Step S39). Processing other than the above is the same as in FIG.

  Here, when the mobile phone 15 is stolen, the image automatically transmitted during the misplacement mode becomes valuable information. However, for privacy protection, images should not be easily referenced.

  Therefore, for example, when the mobile phone 15 is stolen or lost, the owner may issue a certificate of theft or loss at the police station and use this as a permission for image reference. By bringing the report of theft or loss and the image data into the certificate authority / image center 4, the image data can be restored with the private key corresponding to the mobile phone 15 of the owner, and the owner can refer to the image. .

  According to the fifth embodiment of the present invention, since a person who has taken away the mobile phone or an image serving as a clue thereof is transmitted to an external certificate authority / image center or the like, the mobile phone is stolen and cannot be found. You can also check the image.

  INDUSTRIAL APPLICABILITY The portable terminal device and the anti-theft method of the present invention have an effect capable of preventing the portable terminal device from being left behind, etc., and are useful for a portable telephone anti-theft method.

The block diagram which shows the structure of the antitheft system of the portable terminal which concerns on the 1st Embodiment of this invention. The flowchart which shows the antitheft method of the portable terminal which concerns on 1st Embodiment. The block diagram which shows the structure of the antitheft system of the portable terminal which concerns on the 2nd Embodiment of this invention. The flowchart which shows the theft prevention method of the portable terminal which concerns on 2nd Embodiment. The block diagram which shows the structure of the antitheft system of the portable terminal which concerns on the 3rd Embodiment of this invention. The flowchart which shows the theft prevention method of the portable terminal which concerns on 3rd Embodiment. The block diagram which shows the structure of the antitheft system of the portable terminal which concerns on the 4th Embodiment of this invention. The flowchart which shows the antitheft method of the portable terminal which concerns on 4th Embodiment The block diagram which shows the structure of the antitheft system of the portable terminal which concerns on the 5th Embodiment of this invention. The flowchart which shows an example of the theft prevention method of the portable terminal which concerns on 5th Embodiment The flowchart which shows the other example of the antitheft method of the portable terminal which concerns on 5th Embodiment.

Explanation of symbols

2 small wireless device 3 base station 4 certificate authority / image management center 11, 12, 13, 14, 15 mobile phone 101 wireless communication unit 102 distance determination unit 103 operation control unit 104 acceleration monitoring unit 105 operation monitoring unit 106 vibration generation unit 107 Sound generation unit 108 Light generation unit 109 Display generation unit 110 Image recording unit 111 Image acquisition unit 112 Image display unit 113 Face recognition unit 114 Image deletion unit 115 Image encryption unit 116 Transmission data generation unit 117 Destination storage unit 118 Public key storage Unit 119 wireless communication unit 201 wireless communication unit 202 distance determination unit 301 wireless communication unit 401 mobile phone registration unit 402 encryption key generation unit 403 registration information recording unit 404 image input unit 405 image recording unit 406 image restoration unit

Claims (10)

Distance detecting means for detecting a distance from a position indicating the owner;
Motion detection means for detecting motion applied from the outside;
A portable terminal device comprising: an execution unit that executes a function designated in advance when a distance detected by the distance detection unit is a predetermined distance or more and a predetermined operation is detected by the operation detection unit. The mobile terminal device according to claim 1,
The said distance detection means has a radio wave detection means to detect the radio signal transmitted from the transmission terminal device which transmits the radio signal which shows the said owner, The portable terminal device which detects a distance based on the said detected signal. The mobile terminal device according to claim 1 or 2,
The movement detection means is a portable terminal apparatus having movement detection means for detecting movement of the portable terminal apparatus as the predetermined movement. The mobile terminal device according to any one of claims 1 to 3,
It further comprises operation input means for receiving operation input,
The mobile terminal device, wherein the operation detection unit includes an operation input detection unit that detects an operation input to the operation input unit as the predetermined operation. The mobile terminal device according to any one of claims 1 to 4,
Alarm generation means for generating an alarm by at least one of voice, vibration, light emission and display;
The execution means is a portable terminal device that executes alarm generation by the alarm generation means as the designated operation. The mobile terminal device according to any one of claims 1 to 5,
It further comprises imaging means for taking an image,
The execution means is a portable terminal device that executes an imaging operation of the imaging means as the predesignated operation. The mobile terminal device according to claim 6,
Image display means for displaying an image picked up by the image pickup means;
Further comprising face recognition means for recognizing a person's face from the image picked up by the image pickup means,
The said execution means is a portable terminal device displayed on the said image display means which displays the said imaged image, when the face of a person is recognized by the said face recognition means. The mobile terminal device according to claim 6 or 7,
Image storage means for storing an image captured by the imaging means;
A portable terminal device further comprising image erasing means for erasing the captured image when the distance detected by the distance detecting means is equal to or less than a predetermined distance. The mobile terminal device according to claim 6 or 7,
A portable terminal device that transmits an image captured by the imaging unit to a predetermined transmission destination. A method of preventing theft of a mobile terminal device,
Detecting a distance from a position indicating the owner;
Detecting an operation applied to the mobile terminal device from the outside;
Theft having a step of executing a function of the portable terminal device designated in advance when a distance detected by the distance detection means is a predetermined distance or more and a predetermined action is detected by the action detection means Prevention method.

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