JP2014068989A - Portable electronic apparatus - Google Patents

Abstract

Provided is a portable electronic device capable of performing personal authentication without a user's intention with a hand holding the device.
A portable electronic device that performs personal authentication by bioimpedance incorporates a personal authentication device, and includes a differential antenna electrode, a reception loop antenna electrode, an authentication control unit, an electrical signal output control unit, and the like. , A personal authentication processing unit 22, a memory unit 23 for storing a personal authentication template 40, and a threshold value unit 24 in which a threshold value is registered. The differential antenna electrode 11 sends the electrical signal from the electrical signal output control unit 21 to the finger. The personal authentication processing unit 22 compares the code based on the bioelectrical impedance obtained from the electrical signal received by the reception loop antenna electrode 12 with the template 40, and if the difference is within the threshold range, the user with the portable electronic device 1 is identified. Authenticate as a legitimate user.
[Selection] Figure 4

Description

  The present invention relates to a portable electronic device that can perform personal authentication using bioelectrical impedance.

  In recent years, the use of biometric authentication for identity verification has been rapidly increasing due to the enhancement of security at the start-up of portable electronic devices such as mobile phones. In particular, a technique that uses bioimpedance through a hand or a finger is known (Patent Document 1, Patent Document 2). Patent Document 1 includes a current generator, an amplifier, a computer system, and a device that senses electrical and magnetic characteristics, and performs authentication based on electrical impedance due to mechanical resonance of bones and authentication based on the ratio of skin impedance at multiple locations. It is disclosed. Further, Patent Document 2 includes a groove, a plurality of electrodes arranged in the groove and a recognition device on the back surface of the remote control transmission device, and two square waves having different frequencies are applied to a finger and its response voltage is applied. It is disclosed that impedance is calculated from the above and determined as a living body if it is within a threshold value.

Japanese Patent No. 3694238 Japanese Patent Laid-Open No. 10-262951

  However, in Patent Document 1, since authentication is performed based on the ratio of bioimpedance on the skin surface of a plurality of registered sites, it is necessary to apply a plurality of sites on the hand, which increases the sensing mechanism. Further, in Patent Document 2, personal authentication is performed with the unevenness of the finger surface using a plurality of electrode arrays that match the shape of the finger, so that an authentication operation is required in addition to the remote operation. In other words, the biometric authentication method of the prior art has a strong authentication process, impairs the responsiveness of the operation of the portable electronic device, requires an additional operation, and has an effective security performance due to a decrease in the usage rate of the authentication function. Degradation may occur. In addition, since the hand shape varies depending on the person, the prior art has a problem that authentication takes time.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide a portable electronic device capable of personal authentication with a hand holding the device without the intention of the user.

  The portable electronic device of the present invention is provided with a housing, a differential antenna electrode including at least a pair of electrodes provided in the housing and differentially driven, and provided in the housing and wound at least in a single layer. Personal authentication is performed based on the input / output relationship between the reception loop antenna electrode including the conductive wire, the output from the differential antenna electrode, and the input received by the reception loop antenna electrode.

  In the portable electronic device, it is preferable that at least two recesses are provided in the housing, and the differential antenna electrode and the reception loop antenna electrode are provided in each recess.

  The portable electronic device preferably includes a template that combines a combination of a user's finger that contacts the differential antenna electrode and the reception loop antenna electrode and the input / output relationship.

  When the portable electronic device detects the connection of another device to the housing, it is preferable to use a template indicating the input / output relationship when the other device is connected.

  When the portable electronic device detects a cover attached to the housing or a glove used by a user, it is preferable to use a template indicating the input / output relationship when the cover or the glove is detected.

  The portable electronic device preferably stops operating when a pacemaker signal is detected.

  The portable electronic device preferably includes a plurality of differential antenna electrodes and a plurality of reception loop antenna electrodes.

  In the portable electronic device, it is preferable that the reception loop antenna electrode detects radiation from a substrate in the housing, and an authentication control unit performs authentication based on a change in the detected value.

  In the portable electronic device, it is preferable that the reception loop antenna electrode detects a high-frequency signal passing through a human body, and an authentication control unit authenticates the person based on a change in the detected value.

  The portable electronic device includes a voltage application unit that applies a predetermined voltage to the differential antenna electrode, and a voltage detection unit that detects a voltage generated in the reception loop antenna electrode corresponding to the applied voltage. Preferably, an activation detection unit is provided, and the activation detection unit notifies activation detection to the personal authentication processing unit when a voltage equal to or higher than a predetermined threshold voltage is detected at the reception loop antenna electrode.

  In the portable electronic device, the voltage applying unit applies a voltage to the differential antenna electrode at a first frequency, and the voltage detecting unit is a voltage having the first frequency equal to or higher than the threshold voltage of the reception loop antenna electrode. When the voltage application unit applies a voltage at the second frequency to the differential antenna electrode, and the voltage detection unit detects the voltage of the second frequency at the reception loop antenna electrode. The activation detection unit is configured to determine whether a person is a portable electronic device based on a ratio between a voltage applied to the reception loop antenna electrode at the first frequency and a voltage of the second frequency detected at the reception loop antenna electrode. It is preferable to determine that the device has been touched and notify the personal authentication processing unit of activation detection.

  In the portable electronic device, when the voltage detection unit detects a voltage at the reception loop antenna electrode that is longer than the voltage applied to the differential antenna electrode and at a certain interval, the activation detection is performed. The unit preferably notifies the personal authentication processing unit of activation detection.

  The portable electronic device preferably includes a threshold value switching unit that expands an authentication threshold value after authentication.

  When the portable electronic device uses another personal authentication method in combination, it is preferable to perform personal authentication based on the other personal authentication method and the input / output relationship.

  According to the present invention, the operability of the personal authentication can be improved by using the frequency characteristic of the bioimpedance of the user having the portable electronic device as the biometric information, and the unlocking function is smoothly activated by detecting the bioimpedance. Is possible. Since the electrical characteristics of the hand holding the portable electronic device are used as biological information without the intention of the user, it is possible to provide a portable electronic device that is convenient for the user.

1 is an external view of an embodiment of a portable electronic device according to the present invention. The conceptual diagram which shows operation | movement with the differential antenna electrode and receiving loop antenna electrode of the portable electronic device which concerns on this invention. The conceptual diagram which shows operation | movement of the differential antenna electrode and receiving antenna electrode of the portable electronic device which concerns on this invention. The block diagram which shows embodiment of the personal authentication apparatus incorporated in the portable electronic device which concerns on this invention. (A) The block diagram which shows Embodiment 2 of the personal authentication apparatus incorporated in the portable electronic device which concerns on this invention, (b) The conceptual diagram which shows an example of a differential antenna electrode. (A) The block diagram which shows Embodiment 3 of the personal authentication apparatus incorporated in the portable electronic device 1, (b) The conceptual diagram which showed having made four fingers contact the differential antenna electrode, (c) Differential The conceptual diagram which shows having made two fingers contact the antenna electrode. The block diagram which shows Embodiment 4 of the personal authentication apparatus incorporated in the portable electronic device which concerns on this invention. The flowchart figure which shows the procedure of Embodiment 3 or Embodiment 4. FIG. 9 is a block diagram showing a fifth embodiment of a personal authentication device built in a portable electronic device according to the present invention. FIG. 9 is a flowchart showing a procedure of the fifth embodiment. The block diagram which shows Embodiment 6 of the personal authentication apparatus incorporated in the portable electronic device which concerns on this invention. The block diagram which shows Embodiment 7 of the personal authentication apparatus incorporated in the portable electronic device which concerns on this invention. FIG. 10 is a block diagram showing an eighth embodiment of a personal authentication device built in a portable electronic device according to the present invention. FIG. 10 is a waveform diagram of a transmission signal and a reception signal showing the operation of Embodiment 8, (a) a transmission signal from a differential antenna electrode, and (b) a reception signal at a reception loop antenna electrode. FIG. 10 is a flowchart showing the procedure of the eighth embodiment. Waveform diagrams of a transmission signal and a reception signal showing the operation of Modification 1 of Embodiment 8, (a) a transmission signal from the differential antenna electrode, (b) a reception signal at the reception loop antenna electrode when touched by hand, (C) A received signal at the receiving loop antenna electrode when a moving contact is touched. The flowchart figure which shows the procedure of the modification 1 of Embodiment 8 based on FIG. FIG. 10 is a waveform diagram of a transmission signal and a reception signal showing the operation of Modification 2 of Embodiment 8, (a) a transmission signal from a differential antenna electrode, and (b) a reception signal at a reception loop antenna electrode by tapping. The external view which shows Example 1 of the user interface of the portable electronic device which concerns on this invention, (a) ON state, (b) OFF state. The external view which shows Example 2 of the user interface of the portable electronic device which concerns on this invention, (a) ON state, (b) OFF state. FIG. 16 is a block diagram showing a ninth embodiment of a personal authentication device built in a portable electronic device according to the present invention. 10 is a graph for explaining an example of an operation according to the ninth embodiment. FIG. 16 is a block diagram showing a tenth embodiment of a personal authentication device built in a portable electronic device according to the present invention. The schematic diagram which showed the deviation in the measurement point of a part of signature and the signature drawn on the touch panel of Embodiment 10. FIG. FIG. 25 is a block diagram showing a modification of the tenth embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a portable electronic device according to the invention will be described in detail with reference to FIGS.

  FIG. 1 is an external view of an embodiment of a portable electronic device according to the present invention.

  The mobile electronic device 1 according to the embodiment is, for example, a mobile phone such as a smartphone, a tablet, or a portable measuring instrument, and includes a housing 2 and a display 3. The display 3 is a liquid crystal panel, an organic EL panel, or the like, and is also a UI (user interface) type touch panel that performs various processes by touching a finger or a pen. A dent 4 is provided on each side surface of the housing 2, and a differential antenna electrode 11 and a reception loop antenna electrode 12 of a personal authentication device 10 described later built in the housing 2 are provided in the dent 4. ing. By aligning the finger 5 with this recess, the way the portable electronic device 1 is held by the hand 6 is fixed. The portable electronic device 1 performs personal authentication based on the input / output relationship between the output from the differential antenna electrode 11 and the input received by the reception loop antenna electrode 12. In the embodiment, the differential antenna electrode 11 and the reception loop antenna electrode 12 are provided on the side surface of the housing 2, but may be provided integrally with the display 3.

  FIG. 2 is a conceptual diagram showing the operation of the differential antenna electrode 11 and the reception loop antenna electrode 12.

  The differential antenna electrode 11 includes a pair of electrodes 11a and 11b and an amplifier 11c, and the reception loop antenna electrode 12 includes a pair of electrodes 12a and 12b, an amplifier 12d, and a conductive wire 12c wound at least in a single layer. . The inside of the finger 5 or the hand 6 includes skin 5a, subcutaneous tissue 5b, and internal tissues 5c such as bones, tendons, and muscles. For example, a high frequency electric field of 30 MHz to 500 MHz that can reach the internal tissue 5 c is generated from the differential antenna electrode 11, and is transmitted through the internal tissue 5 c and received by the reception loop antenna electrode 12. The generated electric field generated from the differential antenna electrode 11 is transmitted through the finger 5 or the hand 6 as an internal electric field, and the generated magnetic field generated by the internal current flowing in the tissue inside the finger 5 or the hand 6 by the internal electric field is received by the reception loop antenna electrode 12. To detect. The person is identified by increasing the frequency from the lower frequency side (or lowering the frequency from the higher frequency side) in order of a certain frequency (for example, 50 MHz) every predetermined time, and receiving received waves with different levels for each frequency. Thus, the bioimpedance characteristic in which the attenuation amount of the radio signal at each frequency varies depending on the person is used. Further, a plurality of waveforms including a plurality of frequency components such as a pulse waveform may be used, and biological information in which the attenuation amount for each waveform is different depending on a person may be used.

  3 is substantially the same as FIG. 2, but the electric field generated from the differential antenna electrode 11 is transmitted as an internal electric field inside the finger 5 or the hand 6, and is generated when the internal electric field leaks out of the finger 5. The generated electric field is detected by a receiving antenna electrode 13 including a pair of electrodes 13a and 13b and an amplifier 13c.

  FIG. 4 is a block diagram illustrating the first embodiment of the personal authentication device 10 built in the portable electronic device 1.

  A personal authentication device 10 that performs personal authentication using the bioimpedance of the hand 6 holding the portable electronic device 1 includes a differential antenna electrode 11, a reception loop antenna electrode 12, and an authentication control unit 20. The authentication control unit 20 that performs bioimpedance processing includes an electrical signal output control unit 21, a personal authentication processing unit 22, a memory unit 23 that stores a template 40 for personal authentication, and a threshold unit 24 in which thresholds are registered. The electric signal output control unit 21 outputs an electric signal to be applied to the finger 5 and transmits the electric signal to the differential antenna electrode 11, and the differential antenna electrode 11 sends the electric signal from the electric signal output control unit 21 to the finger 5. The personal authentication processing unit 22 compares the code based on the bioimpedance obtained from the electrical signal received by the reception loop antenna electrode 12 with the template 40. If the difference is within the threshold range registered in the threshold unit 24, the user having the portable electronic device 1 is authenticated as a regular user.

  The contact antenna electrode type in which the differential antenna electrode 11 and the reception loop antenna electrode 12 are exposed on the surface of the housing 2 and directly contact the finger 5 to measure bioimpedance has been described. However, the present invention is not particularly limited to this configuration. . For example, in order to facilitate countermeasures against static electricity, the differential antenna electrode 11 and the reception loop antenna electrode 12 are inside the housing 2 and are electrostatically coupled antenna electrode types that are electrostatically coupled to the user's hand 6. Impedance may be measured. Moreover, you may use together a contact antenna electrode and an electrostatic coupling antenna electrode. By using together, the distance between the hand 6 and the antenna electrode becomes constant, and the acquired value of the bioelectrical impedance is stabilized.

  By using the frequency characteristics of the bioimpedance of the user who has the portable electronic device 1 as biometric information, the operability of personal authentication can be improved, and the unlocking function can be started smoothly by detecting bioimpedance. is there. And since the electric characteristic of the hand with the portable electronic device 1 is used as biometric information without the intention of the user, it is possible to provide a portable electronic device that is convenient for the user. In addition, the driving method of the differential antenna electrode 11 and the reception loop antenna electrode 12 may be switched between static and unbalanced, increasing the place where bioimpedance is measured and improving the accuracy.

  FIG. 5A is a block diagram showing a second embodiment of the personal authentication device 10 built in the portable electronic device 1, and FIG. 5B is a conceptual diagram showing an example of the differential antenna electrode 11.

  On the upper part of the housing 2, a button 11 d of the differential antenna electrode 11 of the personal authentication device 10 is provided. An electric signal is applied from the differential antenna electrode 11 to the finger 5 by pressing the button 11d. A button type can be selected according to the function and usage of the portable electronic device 1.

  FIG. 6A is a block diagram showing a third embodiment of the personal authentication device 10 built in the mobile electronic device 1, and FIG. 6B shows that four fingers 5 are brought into contact with the differential antenna electrode 11. FIG. 4C is a conceptual diagram showing that two fingers 5 are brought into contact with the differential antenna electrode 11.

  The difference from the first embodiment is that the differential antenna electrode 11 is vertically long, there are a plurality of templates 40 stored in the memory unit 23, and the template switching unit 25 is between the personal authentication processing unit 22 and the memory unit 23. It is arranged. Other configurations are the same as those of the first embodiment, and the description thereof is omitted.

  When the four fingers 5 are brought into contact with the differential antenna electrode 11, a code based on the bioimpedance obtained from the electrical signal received by the reception loop antenna electrode 12 is stored in the first template 41 (see FIG. 6B). ). Further, a code based on bioimpedance when two fingers 5, for example, a middle finger and an index finger are brought into contact with the differential antenna electrode 11, is stored in the second template 42 (see FIG. 6C). That is, the memory unit 23 stores a plurality of templates 40 that combine the combination of the user's finger 5 that contacts the differential antenna electrode 11 and the reception loop antenna electrode 12 and the input / output relationship. Then, by causing the plurality of templates 40 of the combination of the fingers 5 in contact to learn and using the combination of the fingers 5, the authentication accuracy may be improved.

  FIG. 7 is a block diagram showing a fourth embodiment of the personal authentication device 10 built in the portable electronic device 1. The fourth embodiment is almost the same as the third embodiment.

  When the template switching unit 25 detects the connection of another device, for example, a USB cable, to the housing 2, the template switching unit 25 switches to, for example, the USB connection template 40 that indicates the output relationship during USB connection. By performing this switching, it is possible to consider fluctuations in impedance characteristics due to the influence of the cable, and to improve the authentication accuracy. Further, when a cover attached to the housing 2 or a glove used by the user is detected, the template switching unit 25 switches to the template 40 indicating the input / output relationship at the time of detecting the cover or the glove, thereby improving the authentication accuracy. When the portable electronic device 1 has a cover, the housing 2 may be provided with a cover, and the differential antenna electrode 11 and the reception loop antenna electrode 12 may be provided integrally with the cover.

  FIG. 8 is a flowchart showing the procedure of the third embodiment or the fourth embodiment.

  The template switching unit 25 determines whether another device such as a USB cable is connected to the housing 2 (step S1). When the USB connection is detected (YES in step S1), the USB connection template is switched. When the USB connection is not detected (NO in step S1), template switching is executed (step S2). Next, the personal authentication processing unit 22 compares the code based on the bioimpedance obtained from the electrical signal received by the reception loop antenna electrode 12 with the template 40 (step S3). It is determined whether or not the user is available from a plurality of templates 40 (step S4). If the code difference is within the threshold range registered in the threshold unit 24 (YES in step S4), the user having the portable electronic device 1 is authenticated as a regular user, and the display screen as the display 3 is locked. Is released (step S5). If the code difference is outside the threshold range (NO in step S4), the process is terminated and the display screen is not unlocked.

  FIG. 9 is a block diagram showing a fifth embodiment of the personal authentication device 10 built in the portable electronic device 1.

  The difference from the first embodiment is that the other device detection unit 26 is provided. The other device detection unit 26 stops the operation of the personal authentication device 10 when detecting a signal from another device such as a pacemaker. As a result, the operation of other devices such as a pacemaker can be prevented.

  FIG. 10 is a flowchart showing the procedure of the fifth embodiment.

  It is determined whether another device such as a pacemaker has been detected (step S10). If no other device such as a pacemaker is detected (NO in step S10), personal authentication processing is executed (step S11). The personal authentication processing unit 22 compares the code based on the bioimpedance obtained from the electrical signal received by the reception loop antenna electrode 12 with the template 40 (step S12). It is determined whether or not the user is available (step S12). When the code difference is within the threshold range registered in the threshold unit 24 (YES in step S12), the user having the portable electronic device 1 is authenticated as a regular user and the display screen as the display 3 is locked. Is released (step S13). When another device such as a pacemaker is detected (YES in step S10) and when the code difference is outside the threshold range (NO in step S12), the process is terminated and the display screen is not unlocked.

  FIG. 11 is a block diagram showing a sixth embodiment of the personal authentication device 10 built in the portable electronic device 1.

  The difference from the third embodiment is that a plurality of differential antenna electrodes 11 and a plurality of reception loop antenna electrodes 12 are provided, a transmission electrode switching unit 27 is provided on the side of the plurality of differential antenna electrodes 11, and a plurality of reception loops are provided. The reception electrode switching unit 28 is provided on the antenna electrode 12 side. The electrical signal output control unit 21 outputs an electrical signal, and the transmission electrode switching unit 27 switches the output destination, for example, transmits it to the differential antenna electrode 111, and the differential antenna electrode 111 is transmitted from the electrical signal output control unit 21. Is sent to the finger 5. The transmission signal of the differential antenna electrode 111 is received by, for example, the reception loop antenna electrode 123, and the received electrical signal is transmitted from the reception electrode switching unit 28 to the personal authentication processing unit 22. For a code based on the bioelectrical impedance obtained from the electrical signal received by the reception loop antenna electrode 123, the template 40 within the threshold range in which the difference is registered in the threshold unit 24 is searched from among the plurality of templates 40. If there is a template 40 with a matching code, the user having the portable electronic device 1 is authenticated as a regular user. By combining a plurality of differential antenna electrodes 11 and a plurality of reception loop antenna electrodes 12, it is possible to improve the authentication accuracy by using bioimpedances at a plurality of locations.

  FIG. 12 is a block diagram showing a seventh embodiment of the personal authentication device 10 built in the portable electronic device 1.

  The personal authentication device 10 includes a reception loop antenna electrode 12 and an authentication control unit 20. Radiation from the substrate in the housing 2 is detected by the reception loop antenna electrode 12, and the personal authentication processing unit 22 performs personal authentication based on the change in the detected value. In addition, the personal authentication processing unit 22 may perform personal authentication based on a change in a radio frequency (RF) signal detected by the reception loop antenna electrode 12 via the hand 6. With the method described above, the personal authentication device 10 can eliminate the need for a signal generation system.

  FIG. 13 is a block diagram illustrating an eighth embodiment of the personal authentication device 10 built in the portable electronic device 1.

  The difference from the first embodiment is that an activation detection unit 30 and a control unit 31 are provided. The activation detection unit 30 includes a voltage application unit 32 and a voltage detection unit 33. In the eighth embodiment, the personal authentication device 10 is activated by detecting a change in bioelectrical impedance due to an AC signal. The voltage application unit 32 applies a predetermined AC signal to the differential antenna electrode 11. The voltage detection unit 33 detects an applied voltage from a change in the reception signal of the reception loop antenna electrode 12. Then, activation that occurs when the user touches the portable electronic device 1 is detected from a change in the reception signal of the reception loop antenna electrode 12. The activation detection unit 30 notifies activation detection to the personal authentication processing unit 22. The personal authentication processing unit 22 compares the code based on the bioelectrical impedance obtained from the electrical signal received by the reception loop antenna electrode 12 with the template 40, and if the difference is within the threshold range registered in the threshold unit 24, A user having the portable electronic device 1 is authenticated as a regular user. When the personal authentication processing unit 22 determines that the user is the user, the control unit 31 unlocks the display screen that is the display 3. The control unit 31 is described in the eighth embodiment, but may be provided in the other embodiments 1 to 7 described above.

  Unlike personal authentication processing, in the case of activation detection, frequency stability is not required, so that power consumption can be reduced. Further, detection is possible even when the differential antenna electrode 11 and the reception loop antenna electrode 12 are in the housing 2.

  14A and 14B are waveform diagrams of a transmission signal and a reception signal showing the operation of the eighth embodiment. FIG. 14A shows a transmission signal from the differential antenna electrode 11, and FIG. 14B shows a reception signal at the reception loop antenna electrode 12. Indicates. When the mobile electronic device 1 is touched, the reception loop antenna electrode 12 receives a reception signal.

  The voltage application unit 32 applies an AC transmission signal to the differential antenna electrode 11 at regular intervals. When the voltage of the reception signal from the reception loop antenna electrode 12 is detected by the voltage detection unit 33 and a voltage is detected at the reception loop antenna electrode 12, the activation detection unit 30 notifies the activation detection to the personal authentication processing unit 22. . As a result, it becomes possible to detect activation by detecting a signal through the hand 6 of the user holding the portable electronic device 1, and when the hand 6 does not hold it, current does not flow. Electric power can be reduced. Alternatively, the activation may be detected by AC, and then the personal authentication processing unit 22 may be activated by determining that it is a living body at a different frequency. As a result, malfunction caused by touching the conductive material can be prevented, and power consumption can be reduced.

  FIG. 15 is a flowchart illustrating the procedure of the eighth embodiment.

  The voltage application unit 32 applies an AC transmission signal to the differential antenna electrode 11 at regular intervals (step S20). The voltage detector 33 determines whether or not the applied voltage of the reception signal is detected at the reception loop antenna electrode 12 (step S21). When the applied voltage is detected (YES in step S21), the activation detection unit 30 notifies activation detection to the personal authentication processing unit 22 (step S22). If the applied voltage is not detected (NO in step S21), step S20 and step S21 are repeated until the applied voltage is detected. The case where the applied voltage is not detected is a state where the user does not touch the portable electronic device 1.

  FIG. 16 is a waveform diagram of a transmission signal and a reception signal showing the operation of the first modification of the eighth embodiment. (A) shows the transmission signal from the differential antenna electrode 11, and (b) is touched by hand. The reception signal at the reception loop antenna electrode 12 is shown, and (c) shows the reception signal at the reception loop antenna electrode 12 when a conductive contact is touched.

  The voltage application unit 32 applies the voltage V1 to the differential antenna electrode 11 with an AC first frequency signal at regular intervals. When the reception loop antenna electrode 12 detects the voltage V1 of the first frequency signal that is equal to or higher than the threshold voltage V0, the voltage application unit 32 applies a second frequency different from the first frequency signal to the differential antenna electrode 11 at regular intervals. A voltage V1 is applied by a signal (see FIG. 16A). In the voltage detector 33, the ratio r = V3 / V2 between the voltage V2 of the first frequency signal and the voltage V3 of the second frequency signal is equal to or less than the voltage ratio r1 (r ≦ r1) or equal to or greater than the voltage ratio r2 (r ≧ r2). ) Is detected (r1 <r2), it is determined that a person has touched the portable electronic device 1. In FIG. 16B, the received second frequency signal has a voltage V3 different from the voltage V2 due to the bioimpedance characteristics. Then, the activation detection unit 30 notifies the personal authentication processing unit 22 of activation detection. When the voltage ratio r = V5 / V4 between the voltage ratio r1 and the voltage ratio r2 is detected (r1 <r <r2), the voltage detection unit 33 malfunctions due to contact with a conductive material other than a person. (See FIG. 16C). By detecting the reception state of the two signals as compared with the template 40 and detecting that it is a living body, it is possible to prevent erroneous detection due to contact with a conductive object.

  FIG. 17 is a flowchart showing a procedure of the first modification of the eighth embodiment based on FIG.

  The voltage application unit 32 applies the voltage V1 of the AC first frequency signal to the differential antenna electrode 11 at regular intervals (step S30). The voltage detection unit 33 determines whether or not the signal received by the reception loop antenna electrode 12 is equal to or higher than the threshold voltage V0 (step S31). When the voltage of the first frequency signal is detected to be equal to or higher than the threshold voltage V0 (YES in step S31), the voltage application unit 32 applies a second frequency different from the first frequency signal to the differential antenna electrode 11 at regular intervals. A signal is applied (step S32). If the first frequency signal equal to or higher than the threshold voltage V0 is not detected (NO in step S31), the mobile electronic device 1 is not touched, and the process returns to step S30. The voltage detection unit 33 determines whether or not the ratio r between the voltage of the first frequency signal and the voltage of the second frequency signal is a value between the voltage ratios r1 and r2 (step S33). When the voltage ratio r is r1 or less or r2 or more (step 33 is YES), it is determined that a person has touched the portable electronic device 1, and the activation detection unit 30 notifies the personal authentication processing unit 22 of activation detection. (Step S34). When the voltage ratio r is larger than r1 and smaller than r2 (NO in step 33), the voltage detection unit 33 determines that the malfunction is due to contact with a conductive material other than a person, and returns to step S30.

  18A and 18B are waveform diagrams of a transmission signal and a reception signal showing the operation of the second modification of the eighth embodiment, where FIG. 18A shows the transmission signal from the differential antenna electrode 11, and FIG. 18B shows reception by tapping. A reception signal at the loop antenna electrode 12 is shown.

  When there is tapping, the voltage becomes longer than the voltage applied to the differential antenna electrode 11 and at a constant interval (see FIG. 16B). The voltage detection unit 33 can prevent malfunction caused by touching a conductive object by detecting an impedance variation due to tapping and detecting activation.

  FIGS. 19A and 19B are external views showing the first embodiment of the user interface, where FIG. 19A shows the ON state and FIG. 19B shows the OFF state.

  On the display 3 of the portable electronic device 1, an automatic detection function setting button 35 and a sensitivity setting unit 36 are displayed. The setting button 35 displays “ON” and “OFF”, and is also a switch for switching between “valid” and “invalid” of the automatic detection function. The setting button 35 is an “ON-OFF” toggle switch, and when the setting button 35 is clicked, the display of “ON” and “OFF” is switched. When “ON”, the sensitivity setting unit 36 is displayed, and an input for changing the setting of the sensitivity setting unit 36 is accepted. When “OFF”, the sensitivity setting unit 36 is not displayed or grayed out so that the sensitivity setting unit 36 cannot be operated. I have to. The sensitivity setting unit 36 receives an input of the threshold voltage V0 setting that determines that the person has the portable electronic device 1 in the activation detection unit 30. The level marker 36a of the sensitivity setting unit 36, when the user slides, accepts a setting input of high or low sensitivity and displays the setting state. As long as the set value can be input as an absolute value or a relative value as a value between the first sensitivity (high) and the second sensitivity (low), a notation such as a progress meter or direct numerical input may be used. .

  20A and 20B are external views showing a second embodiment of the user interface, where FIG. 20A shows the ON state and FIG. 20B shows the OFF state.

  On the display 3 of the portable electronic device 1, a setting button 37 for an automatic biological detection function and a detection ratio setting unit 38 are displayed. The setting button 37 displays “ON” and “OFF”, and is also a switch for enabling / disabling the automatic detection function. The setting button 37 is an “ON-OFF” toggle switch. When the setting button 37 is clicked, the display of “ON” and “OFF” is switched, and the automatic biometric detection function is enabled / disabled to the user. At the same time, an input for changing the setting is accepted. In “ON”, the detection ratio setting unit 38 is displayed, and an input for changing the setting of the detection ratio setting unit 38 is accepted. In “OFF”, the detection ratio setting unit 38 is not displayed or is grayed out and detected. Is inoperable. The detection ratio setting unit 38 receives an input for setting the ratio (r1, r2) of the voltage V1 of the first frequency signal and the voltage V2 of the second frequency signal that determines that the person has the portable electronic device 1. The level marker 38a of the detection ratio setting unit 38 receives a setting input for the ratio, and displays the setting state when the user slides. As long as the set value can be input as an absolute value or relative value between the first ratio (high) and the second ratio (low), a notation such as a progress meter or direct numerical input may be used. .

  FIG. 21 is a block diagram illustrating the ninth embodiment of the personal authentication device 10 built in the portable electronic device 1.

  A difference from the first embodiment is that a threshold value switching unit 24S is provided, and a plurality of threshold values, a first threshold value 24a, a second threshold value 24b, a third threshold value 24c,. . The personal authentication processing unit 22 compares the feature value, which is a numerical value sequence of each frequency channel, with the identity value sequence of the template 40, and within a threshold range registered in the threshold value unit 24, which is a constant allowable amount. If there is, it will be identified. At that time, if there are a plurality of thresholds to be determined as the person, it can be selected according to the situation. For example, there is always a deviation from the person's template 40 depending on how the portable electronic device 1 is held, and the deviation is assumed to be large especially when the holding method is not stable, such as immediately after holding the portable electronic device 1. Is done. In accordance with the magnitude of the deviation, the threshold value switching unit 24S switches the threshold value, for example, in an increasing direction (first threshold value 24a → third threshold value 24c). If there are a plurality of threshold values 24a, 24b, 24c, etc., even when the lock is released, even if the deviation is large due to unstable holding, it is possible to determine the identity and promptly release the lock, and operability of identity authentication It is possible to improve.

  FIG. 22 is a graph illustrating an example of the operation of the ninth embodiment.

  The vertical axis indicates the pass characteristics, the horizontal axis indicates the frequency, and the thick line at the center is the numerical value sequence of the person registered in the template 40. The dotted line indicates the range of the first threshold 24a, the broken line indicates the range of the second threshold 24b, and the alternate long and short dash line indicates the range of the third threshold 24c. Examples of ranges are listed below. The size of the threshold range is first threshold value 24a <second threshold value 24b <third threshold value 24c.

(1) During normal times (when the portable electronic device 1 is held in a stable manner), if the deviation <the first threshold 24a, the person is determined, and if the deviation> the first threshold 24a, the person is not determined. .
(2) At the time of unlocking, if deviation <second threshold 24b, the person is determined, and if deviation> second threshold 24b, the person is not determined.
(3) When the display 3 is OFF, if the deviation <the third threshold 24c, it is determined that the person is the person, and if the deviation> the third threshold 24c, the person is determined not to be the person.
The above-described determination is an example and is not particularly limited.

  In addition to the above, when it is assumed that the lock has already been released and the user continues to operate the portable electronic device 1, it is possible to set a larger threshold value of the third threshold value 24c. For example, even if the holding method changes from normal, such as by copying the displayed content on paper, the shift to the locked state can be avoided because the threshold value is large. In addition, the operation by a third party can be avoided by continuing authentication (authenticating once with the standard threshold and then continuing to be determined by the third threshold 24c). Furthermore, it is possible to switch the weighting numerical value sequence for each channel value. By increasing the weight of the channel that is stable even immediately after unlocking, it is possible to reduce the false rejection rate without impairing operability.

  FIG. 23 is a block diagram showing a tenth embodiment of the personal authentication device 10 built in the mobile electronic device 1, and shows an example of the mobile electronic device 1 that uses another personal authentication method.

  The difference from the first embodiment is that a detection unit 50 that detects a reception signal of the reception loop antenna electrode 12 and a feature amount extraction unit 51 that extracts a feature amount that is a numerical sequence of the reception signal are provided. In addition, a signature authentication unit 52 that performs signature authentication in response to a coordinate signal, a pressing signal, or the like from the touch panel 3S of the display 3 is provided. Sign authentication by the sign authentication unit 52 and personal authentication based on bioelectrical impedance by the authentication control unit 20 are simultaneously performed, and a numerical sequence of deviations from the principal template 40S due to an operation by a sign operation is set as a second feature amount.

  FIG. 24 is a schematic diagram illustrating a part of a sign drawn on the touch panel 3S of the tenth embodiment and a deviation at a measurement point of the sign.

  The sign is represented by a solid curve curve. The sign authentication unit 52 compares the variation of the bioelectrical impedance at each measurement point (see the arrow in the figure) with the feature amount of the principal registered in the principal template 40S. In each graph, a straight line (see the broken line) indicates the feature amount of the person registered in the template 40S, and a curved line (see the solid line) indicates variation in bioelectrical impedance. It is possible to obtain higher identification authentication accuracy by using both the sign writing method and the biometric impedance variation caused by the signature authentication operation.

  FIG. 25 is a block diagram illustrating a modification of the tenth embodiment.

  In the tenth embodiment, an impedance fluctuation detection unit 55, a sine locus detection unit 56, and a composite authentication unit 57 are provided. The impedance fluctuation detection unit 55 detects the fluctuation of the biological impedance from the reception signal of the reception loop antenna electrode 12. The sine locus detection unit 56 detects a sine signal from the touch panel 3S. The composite authentication unit 57 compares the signal detected by the impedance fluctuation detection unit 55 and the sine locus detection unit 56 with the template 40 and authenticates the person if it is within the threshold range registered in the threshold unit 24.

  Although the sign has been described, the present invention is not limited to this, and other personal authentication methods can be used in combination. For example, the bioelectrical impedance deviation when pressing the passcode may be used as the feature amount in combination with the passcode input. It is possible to improve the authentication accuracy by using the code matching and the habit of code input operation (the position where the touch panel is pressed changes according to the code and the bioelectrical impedance varies). Further, in combination with motion authentication, the displacement of the bioelectrical impedance during operation may be added to the feature amount. Even if the motion is the same, it is possible to improve the authentication accuracy by using the habit at the time of motion operation together. Furthermore, it may be used in combination with fingerprint, iris and face authentication, and bioimpedance during the authentication operation may be added to the feature quantity. Even if counterfeit fingerprints, iris photographs, and face photographs are used, it is possible to improve authentication accuracy by using a combination of authentication operations.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  The portable electronic device according to the present invention requires personal authentication such as a mobile phone, a tablet, and a laptop computer, and can be applied to an application in which personal authentication can be easily performed with a hand holding the mobile electronic device.

DESCRIPTION OF SYMBOLS 1: Portable electronic device 2: Case 3: Display 4: Indentation 5: Finger 6: Hand 10: Personal authentication apparatus 11: Differential antenna electrode 12: Reception loop antenna electrode 20: Authentication control part 21: Electric signal output control part 22: Personal authentication processing unit 23: Memory unit 24: Threshold unit 24S: Threshold switching unit 25: Template switching unit 26: Other device detection unit 30: Startup detection unit 32: Voltage application unit 33: Voltage detection unit 40: Template

Claims (14)

A housing,
A differential antenna electrode including at least a pair of electrodes provided in the casing and differentially driven;
A reception loop antenna electrode including a conducting wire provided in the housing and wound at least in a single layer;
A portable electronic device that performs personal authentication based on an input / output relationship between an output from the differential antenna electrode and an input received by the reception loop antenna electrode. The portable electronic device according to claim 1,
The housing is provided with at least two depressions;
A portable electronic device, wherein the differential antenna electrode and the reception loop antenna electrode are provided in each recess. The portable electronic device according to claim 1,
A portable electronic device comprising a template that combines a combination of a user's finger that contacts the differential antenna electrode and the reception loop antenna electrode and the input / output relationship. The portable electronic device according to claim 1,
A portable electronic device that uses a template indicating the input / output relationship when the other device is connected when the connection of the other device to the housing is detected. The portable electronic device according to claim 1,
When a cover attached to the housing or a glove used by a user is detected, a portable electronic device that uses a template indicating the input / output relationship when the cover or the glove is detected. The portable electronic device according to claim 1,
A portable electronic device that stops operation when it detects a pacemaker signal. The portable electronic device according to claim 1,
A portable electronic device comprising a plurality of differential antenna electrodes and a plurality of reception loop antenna electrodes. The portable electronic device according to claim 1,
A portable electronic device in which the reception loop antenna electrode detects radiation from a substrate in the housing, and an authentication control unit authenticates the user based on a change in the detected value. The portable electronic device according to claim 1,
A portable electronic device in which the reception loop antenna electrode detects a high-frequency signal passing through a human body, and the authentication control unit authenticates the person based on a change in the detected value. The portable electronic device according to claim 1,
A start detection unit having a voltage application unit that applies a predetermined voltage to the differential antenna electrode, and a voltage detection unit that detects a voltage generated in the reception loop antenna electrode corresponding to the applied voltage; ,
The activation detection unit is a portable electronic device that notifies activation detection to the personal authentication processing unit when a voltage equal to or higher than a predetermined threshold voltage is detected at the reception loop antenna electrode. The portable electronic device according to claim 10,
The voltage applying unit applies a voltage to the differential antenna electrode at a first frequency;
When the voltage detection unit detects a voltage of the first frequency equal to or higher than the threshold voltage in the reception loop antenna electrode, the voltage application unit applies a voltage to the differential antenna electrode at a second frequency,
When the voltage detection unit detects the voltage of the second frequency at the reception loop antenna electrode, the activation detection unit includes the voltage applied to the reception loop antenna electrode at the first frequency, and the reception A portable electronic device that determines that a person has touched the portable electronic device from a ratio with the voltage of the second frequency detected by the loop antenna electrode. The portable electronic device according to claim 10,
In the reception loop antenna electrode, the voltage detection unit,
The portable electronic device, wherein when detecting a voltage that is longer than the voltage applied to the differential antenna electrode and spaced at a certain interval, the activation detection unit notifies activation detection to the personal authentication processing unit. The portable electronic device according to claim 1,
A portable electronic device comprising a threshold switching unit that expands an authentication threshold after authentication. The portable electronic device according to claim 1,
A portable electronic device that performs personal authentication based on the input / output relationship with another personal authentication method when another personal authentication method is used in combination.

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