JP2019185460A - Biological information authentication device - Google Patents

Abstract

To provide a biological information authentication device capable of suppressing troublesomeness in biological information authentication.SOLUTION: A biological information authentication device 1 is generally configured to include a first piezoelectric element 2 for applying vibration to a transmission member, a second piezoelectric element 3 that detects vibration transmitted through a transmission path 10 in the order of the first piezoelectric element 2, the transmission member, a part of the body of a person to be authenticated that is brought into contact with the transmission member, and the transmission member, and a control unit 4 that calculates biological information of the person to be authenticated based on the vibration added by the first piezoelectric element 2 and the vibration detected by the second piezoelectric element 3 and authenticates whether or not the person to be authenticated is a registrant by comparing the calculated biological information of the person to be authenticated and preregistered biological information of the registrant.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a biometric information authentication apparatus.

  As a conventional technique, a first authentication unit that authenticates a user wearing a terminal based on information received from the terminal when the operation unit and a terminal that biometrically authenticates the worn user approach, 2. Description of the Related Art An authentication device including a second authentication unit that authenticates a user who operates an operation unit based on characteristics of a user's hand or arm that operates the operation unit after being authenticated by an authentication unit is known (For example, refer to Patent Document 1).

  The second authentication unit of the authentication device includes a vibration unit that vibrates the operation unit with a required vibration pattern, and a first information reception unit that receives information indicating a vibration pattern of a user's hand or arm wearing the terminal from the terminal. Vibration authentication for authenticating the user who operates the operation unit based on the sameness between the vibration pattern when the vibration means is vibrated by the vibration means and the vibration pattern indicated by the information received by the first information reception means Means.

JP 2017-107387 A

  However, the conventional authentication device has a troublesome problem because the user must wear a terminal for authentication of biometric information.

  Therefore, an object of the present invention is to provide a biometric information authentication apparatus that can suppress the troublesomeness in biometric information authentication.

  One embodiment of the present invention includes a vibration adding unit that applies vibration to a transmission member, a vibration adding unit, a transmission member, a part of the body of an authentication target that contacts the transmission member, and a path in the order of the transmission member. The biometric information of the person to be authenticated is calculated based on the vibration detected by the vibration detector, the vibration added by the vibration adder, and the vibration detected by the vibration detector. And a biometric information authenticating device comprising: an authenticating unit that performs authentication of whether or not an authentication target person is a registrant by comparing biometric information of a registrant registered in advance.

  According to the present invention, troublesomeness in authentication of biometric information can be suppressed.

FIG. 1A is a schematic diagram for explaining an example of the biometric information authentication apparatus according to the embodiment, and FIG. 1B is an example of a block diagram of the biometric information authentication apparatus. c) is a schematic diagram for explaining an example of a configuration of a first piezoelectric element and a second piezoelectric element of the biometric information authentication apparatus. FIG. 2A is a graph showing an example of a drive signal generated by the biometric information authentication apparatus according to the embodiment, and FIG. 2B is a graph showing an example of a detection signal detected by the biometric information authentication apparatus. It is. FIG. 3A is a graph showing an example of the frequency distribution of the drive signal of the biometric authentication device according to the embodiment, and FIG. 3B shows an example of the frequency distribution of the detection signal of the registrant A. 3C is a graph showing an example of the frequency distribution of the detection signal of the registrant B, and FIG. 3D is a schematic diagram showing an example of the registration information. FIG. 4 is a flowchart showing an example of the operation of the biometric information authentication apparatus according to the embodiment.

(Summary of embodiment)
A biometric information authentication device according to an embodiment includes a vibration adding unit that applies vibration to a transmission member, a vibration adding unit, a transmission member, a part of a body of an authentication target that contacts the transmission member, and a transmission member Based on the vibration detection unit that detects the vibration transmitted through the route, the vibration added by the vibration addition unit, and the vibration detected by the vibration detection unit, the biometric information of the person to be authenticated is calculated, and the calculated authentication target An authentication unit that compares the biometric information of the person and the biometric information of the registrant registered in advance to authenticate whether or not the person to be authenticated is a registrant.

  Since this biometric information authentication device can perform biometric information authentication by bringing a part of the body of the person to be authenticated into contact with a transmission member that transmits vibration, a terminal is attached in advance for biometric information authentication. Compared with such a case, the troublesomeness in the authentication of biometric information can be suppressed.

[Embodiment]
(Outline of the biometric information authentication device 1)
FIG. 1A is a schematic diagram for explaining an example of the biometric information authentication apparatus according to the embodiment, and FIG. 1B is an example of a block diagram of the biometric information authentication apparatus. c) is a schematic diagram for explaining an example of a configuration of a first piezoelectric element and a second piezoelectric element of the biometric information authentication apparatus. FIG. 2A is a graph showing an example of a drive signal generated by the biometric information authentication apparatus according to the embodiment, and FIG. 2B is a graph showing an example of a detection signal detected by the biometric information authentication apparatus. It is. FIG. 3A is a graph showing an example of the frequency distribution of the drive signal of the biometric authentication device according to the embodiment, and FIG. 3B shows an example of the frequency distribution of the detection signal of the registrant A. 3C is a graph showing an example of the frequency distribution of the detection signal of the registrant B, and FIG. 3D is a schematic diagram showing an example of the registration information.

  2A and 2B, the vertical axis represents the voltage V, and the horizontal axis represents time t. In FIG. 3A to FIG. 3C, the vertical axis is intensity, and the horizontal axis is frequency f. In each figure according to the embodiment described below, the ratio between figures may be different from the actual ratio. In FIG. 1B, main signals and information flow are indicated by arrows.

  For example, as shown in FIGS. 1A and 1B, the biometric information authentication device 1 is in contact with a vibration adding unit that applies vibration to the transmission member, and the vibration adding unit, the transmission member, and the transmission member. A vibration detection unit that detects vibrations transmitted through a part of the body of the person to be authenticated and the path (transmission path 10) in order of the transmission member, vibration added by the vibration addition unit, and vibration detection unit detected Whether biometric information of the person to be authenticated is calculated based on the vibration, and the biometric information of the person to be authenticated and the biometric information of the registrant registered in advance are compared to determine whether the person to be authenticated is a registrant And a control unit 4 as an authentication unit for performing authentication.

  The vibration applying unit and the vibration detecting unit are configured by piezoelectric elements (first piezoelectric element 2 and second piezoelectric element 3), and detect a load applied to the transmission member. Then, the control unit 4 is configured to determine the touch of the person to be authenticated on the transmission member based on the detected load and start the authentication operation.

  The biometric information authentication device 1 is mounted on a vehicle, for example, but is not limited thereto. And as an example, as shown to Fig.1 (a), although the transmission member is the operation part 60 of the touchpad 6, it is not limited to this. Examples of other transmission members include a palm rest, a touch panel, and a door panel.

  For example, the biometric information authentication apparatus 1 gives an instruction to execute a service such as a sheet registered by the registrant and the temperature of the air conditioner when the registrant is authenticated. In the biometric information authentication device 1, for example, when the transmission member is a door panel, the user touches the door panel in the area where the first piezoelectric element 2 and the second piezoelectric element 3 are arranged, and touch is determined. Authentication is performed. For example, when authentication is established, the vehicle control unit 8 of the vehicle releases the door lock and adjusts the seat, the air conditioner, and the like based on information registered by the authenticated registrant.

  In the present embodiment, authentication of biometric information is performed by the person to be authenticated bringing the hand 9 into contact with the operation surface 61 of the touch pad 6. The operation surface 61 of the touch pad 6 may be formed with a mark as a target for placing the finger of the person to be authenticated.

  The touch pad 6 is, for example, a capacitive touch pad. The touch pad 6 is configured to accept, for example, a tap operation, a touch operation, a tracing operation, a pinch-in operation, a pinch-out operation, and the like performed on the operation surface 61 by an operator's operation finger.

(Configuration of the first piezoelectric element 2 and the second piezoelectric element 3)
For example, the first piezoelectric element 2 and the second piezoelectric element 3 have the same configuration and are disposed adjacent to the back surface 62 side of the operation unit 60. As an example, this arrangement is such that the first piezoelectric element 2 corresponds to the position of the index finger 91 of the user's hand 9 and the second piezoelectric element 3 corresponds to the position of the middle finger 92.

  As a modified example of this arrangement, the first piezoelectric element 2 and the second piezoelectric element 3 may be arranged, for example, one on each of the thumb 90, the index finger 91, the middle finger 92, the ring finger 93, and the little finger 94. . When the hand 9 is brought into contact with the operation surface 61, except for the thumb 90, the abdomen of the finger contacts the operation surface 61 and the contact area increases. Therefore, the position where the first piezoelectric element 2 and the second piezoelectric element 3 are arranged is preferably arranged according to a finger other than the thumb 90, and more preferably arranged according to an adjacent finger. Further, the first piezoelectric element 2 and the second piezoelectric element 3 may be arranged not only for the finger but also for the wrist portion of the hand.

  The first piezoelectric element 2 and the second piezoelectric element 3 are, for example, unimorph type piezoelectric actuators including a metal shim 20 and a piezoelectric body 21 as shown in FIG. This monomorph type piezoelectric actuator is an actuator having a structure that is bent by only one piezoelectric body 21. As a modification, a bimorph type piezoelectric actuator in which two piezoelectric elements are provided on both surfaces of the metal shim 20 may be used.

  The metal shim 20 has an elongated plate shape and is in contact with the back surface 62 of the operation unit 60. The metal shim 20 is formed using, for example, a metal material such as conductive aluminum, nickel, copper, or iron. The piezoelectric body 21 expands and contracts by, for example, a supplied voltage. Due to this expansion and contraction, the metal shim 20 is bent, and vibration is generated by this bending.

  Examples of the material of the piezoelectric body 21 include lithium niobate, barium titanate, lead titanate, lead zirconate titanate (PZT), lead metaniobate, and polyvinylidene fluoride (PVDF). The piezoelectric body 21 is, for example, a stacked piezoelectric element formed by stacking films formed using these materials.

  As a modification, the vibration applying unit is not limited to a piezoelectric element, and may be a shape memory alloy actuator that generates vibration.

First piezoelectric element 2, for example, to generate vibrations by the driving signals S _1, as shown in FIGS. 2 (a) and 3 (a). The driving signals S _1, as an example, the amplitude is a, it assumed frequency is f _2. That driving signals S _1, for example, be output as a change in voltage V, a sine wave amplitude of a frequency at f _2. Note the drive signals S ₁ as a modification is not limited to a sine wave, it may be a rectangular wave.

  As an example, the frequency of vibration generated by the first piezoelectric element 2 is preferably about 200 Hz, which is the natural frequency of the skin. However, in order to prevent the person to be authenticated from recognizing vibration and feeling annoying, the vibration frequency is more preferably 500 Hz or more as an example. As a modification, the vibration frequency may be a frequency higher than 20 kHz, which is outside the audible range, as an example.

As an example, the frequency of vibration in the present embodiment is 500 Hz. Thus the frequency _{f 2} illustrated in FIG. 3 (a) is a 500 Hz.

First piezoelectric element 2 adds a vibration to the operation unit 60 on the basis of the driving signal S _1. For example, as shown in FIG. 1A, this vibration is detected by the second piezoelectric element 3 mainly via the transmission path 10 in the order of the operation unit 60, the index finger 91, the middle finger 92, and the operation unit 60. Is done. For example, as shown in FIG. 2B, the second piezoelectric element 3 detects vibration and outputs a detection signal S ₃ as a change in the voltage V.

The vibration that reaches the second piezoelectric element 3 via the transmission path 10 arrives with a delay from the vibration start time t ₁ and has an amplitude as shown in FIGS. 2A and 2B, for example. Change. The time delay, amplitude change, and frequency component change depend on, for example, the skin of the hand of the person to be authenticated, the thickness of the hand 9, the length of the finger, the thickness of the finger, etc. . The biometric information authentication device 1 calculates biometric information based on these differences and authenticates the biometric information.

  When biometric information is authenticated by vibration, the hand of the person to be authenticated needs to be in contact with the transmission member (operation unit 60). Therefore, when the biometric information authentication device 1 detects a load applied to the operation unit 60 by at least one of the first piezoelectric element 2 and the second piezoelectric element 3, the authentication target person touches the operation unit 60. Authentication operation is started as if

In the present embodiment, in order to improve the transmission of vibration, when the first piezoelectric element 2 and the second piezoelectric element 3 detect a touch, an authentication operation is started. Control unit 4 determines that the detection signal S ₂ output from the first piezoelectric element 2, and the detection signal S ₃ output from the second piezoelectric element 3, to calculate the load based on the touch.

(Configuration of control unit 4)
The control unit 4 includes, for example, a CPU (Central Processing Unit) that performs operations and processes on acquired data according to a stored program, a RAM (Random Access Memory) that is a semiconductor memory, a ROM (Read Only Memory), and the like. Microcomputer. In this ROM, for example, a program for operating the control unit 4, registration information 40, an authentication threshold value 41, and a touch threshold value 42 are stored. For example, the RAM is used as a storage area for temporarily storing calculation results and the like. Further, the control unit 4 has means for generating a clock signal therein, and is configured to measure time.

The control unit 4 uses at least one of a phase difference, an amplitude ratio, and a frequency component between the drive signal S ₁ supplied to the first piezoelectric element 2 and the detection signal S ₃ detected by the second piezoelectric element 3. To calculate biometric information. In the present embodiment, for example, as shown in FIG. 3D, the biological information 400 is defined by the phase difference, the amplitude ratio, and the frequency component.

  The control unit 4 stores the biometric information 400 for each registrant in association with the registration information 40. In FIG.3 (d), the biometric information 400 of the registrant A and the registrant B is shown as an example.

For example, as shown in FIG. 2A and FIG. 2B, the phase difference includes a time t _{1 at} which the first piezoelectric element 2 starts to vibrate, and the second piezoelectric element 3 starts to detect vibration. It is a difference Δt with the time t ₂ to be performed. Amplitude ratio is, for example, the ratio of the amplitude b of the amplitude a and the detection signal _{S 3} of the drive signals _{S 1} (a / b). Frequency components are, for example, the intensity at a predetermined frequency in the detection signal S _3. For example, the frequency components of the present embodiment are defined as a frequency f ₁ , a frequency f _2, and a frequency f _3, and the intensities of these frequencies are associated with each other.

  This phase difference mainly depends on, for example, the length of the finger, that is, the length of the transmission path 10. For example, the amplitude ratio mainly depends on the thickness of the finger and the thickness of the hand. Further, the frequency component mainly depends on the hardness of the finger, for example.

As an example, biometric information 400 of registrant A has a phase difference of Δt ₁ , an amplitude ratio (a / b) of a ₁ / b ₁ , and a frequency, as shown in FIGS. The components are f ₁ = α ₁ , f ₂ = β ₁ , and f ₃ = γ ₁ .

As an example, the biometric information 400 of the registrant B has a phase difference of Δt ₂ , an amplitude ratio (a / b) of a ₂ / b ₂ , a frequency, as shown in FIGS. 3C and 3D. The components are f ₁ = α ₂ , f ₂ = β ₂ , and f ₃ = γ ₂ .

The control unit 4, for example, a phase difference on the basis of the drive signal S ₁ and the detection signal S _3, calculates the amplitude ratio and the frequency components. Next, the control unit 4 compares the phase difference, amplitude ratio, and frequency component with the phase difference, amplitude ratio, and frequency component of the registration information 40. Next, the control unit 4 calculates, for example, the difference between the phase difference, amplitude ratio, and frequency component obtained from the person to be authenticated and the phase difference, amplitude ratio, and frequency component of the registrant registered in the registration information 40. If all the differences are within the authentication threshold value 41, it is determined that the person to be authenticated is a registrant. The control unit 4, authentication generates the authentication information S ₄ containing information of a registrant and it was established to output to the vehicle control unit 8 of the vehicle.

  As a modification, for example, the control unit 4 may determine that the authentication has been established when at least two of the phase difference, amplitude ratio, and frequency component between the authentication target person and the registrant are equal to or less than the authentication threshold value 41. good.

  Below, an example of operation | movement of the biometric information authentication apparatus 1 of this Embodiment is demonstrated, referring the flowchart of FIG. Here, the case where the biometric information authentication device 1 is mounted on the touch pad 6 in the vehicle will be described.

(Operation)
The control unit of the biometric information authentication device 1 4 monitors whether the touch to the detection signal S ₂ and the detection signal S ₃ operation unit 60 based on the output from the first piezoelectric element 2 and the second piezoelectric element 3 is made To do. Control unit 4, "Yes" is established in step 1, that is, when the load based on the detection signal _{S 2} and the detection signal _{S 3} is touch threshold 42 or more (Step1: Yes), determines that the touch has been made .

Next, the control unit 4 has determined the touch, and output to the first piezoelectric element 2 and generates a driving signal S _1, to initiate vibration (Step2). Subsequently, the control unit 4, the second piezoelectric element 3 whether to detect the vibration monitors the detection signal S _3.

Next, the control unit 4 "Yes" is established in step 3, that is, when the detected vibration (Step3: Yes), and calculates the biometric information of the authentication target person based on the drive signal _{S 1} and the detection signal _{S 3} ( Step 4). This biological information is the above-described phase difference, amplitude ratio, and frequency component.

Next, the control unit 4 compares the calculated biometric information of the person to be authenticated with the biometric information 400 of the registration information 40 and determines whether or not a difference such as a phase difference is within the authentication threshold value 41. The control unit 4, when the difference between such phase difference seemed authentication threshold 41 or less (Step5: Yes), along with indicating the successful authentication, the authentication information S ₄ containing information of the authenticated registrant of the vehicle It outputs to the vehicle control part 8 and complete | finishes authentication (Step6).

The vehicle control unit 8 starts the service in accordance with the registrant based on the authentication information S _4. This service means, for example, playing favorite music registered in advance, adjusting the position of the seat, or setting the temperature of the air conditioner. In addition, when the biometric information authentication apparatus 1 is arrange | positioned at the door, the vehicle control part 8 cancel | releases the lock | rock of a door, for example, and starts said service.

Here, when the authentication is not established in Step 5 (Step 5: No), the control unit ₄ outputs the authentication information S4 indicating that the authentication is not established to the vehicle control unit 8 (Step 7). For example, the vehicle control unit 8 performs a notification that prompts another authentication when the authentication is not established.

(Effect of embodiment)
The biometric information authentication device 1 according to the present embodiment can suppress bothersomeness in biometric information authentication. Specifically, the biometric information authentication device 1 can authenticate biometric information by bringing the hand 9 of the person to be authenticated into contact with the operation unit 60 that transmits vibration, so that this configuration is not employed. Thus, bothersomeness in biometric information authentication can be suppressed.

  In the biometric information authentication device 1, both the vibration applying unit and the vibration detecting unit are configured by piezoelectric elements (the first piezoelectric element 2 and the second piezoelectric element 3), and therefore the biometric information authentication device 1 is operated from the load applied to the operation unit 60. A touch on the unit 60 can be detected. The biometric information authentication device 1 authenticates biometric information when a touch is detected by the first piezoelectric element 2 and the second piezoelectric element 3. Vibration can be added and detected while the index finger 91 and the middle finger 92, which are both ends of the transmission path 10, are in contact with each other, and the authentication accuracy is improved and the security is improved.

  Here, the biometric information authentication device 1 as another embodiment is configured such that the vibration applying unit and the vibration detecting unit are configured by piezoelectric elements, and the functions thereof can be exchanged. The exchange is possible by adding vibration by the first piezoelectric element 2 and detecting vibration by the second piezoelectric element 3, and adding vibration by the second piezoelectric element 3 and vibrating by the first piezoelectric element 2. Is to detect.

  The biometric information authentication device 1 according to this embodiment alternately adds and detects vibrations, performs processing such as the calculated phase difference, amplitude ratio, and average of frequency components, and registers the biometric information of the person to be authenticated calculated. Authentication is performed by comparing with the biological information of the person. The biometric information authentication device 1 is more improved in authentication accuracy and security than the case where this configuration is not adopted.

  As mentioned above, although some embodiment and modification of this invention were demonstrated, these embodiment and modification are only examples, and do not limit the invention based on a claim. These novel embodiments and modifications can be implemented in various other forms, and various omissions, replacements, changes, and the like can be made without departing from the scope of the present invention. In addition, not all the combinations of features described in these embodiments and modifications are essential to the means for solving the problems of the invention. Further, these embodiments and modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Biometric information authentication apparatus, 2 ... 1st piezoelectric element, 3 ... 2nd piezoelectric element, 4 ... Control part, 6 ... Touch pad, 8 ... Vehicle control part, 9 ... Hand, 10 ... Transmission path, 20 ... Metal shim, 21 ... piezoelectric body, 40 ... registration information, 41 ... authentication threshold, 42 ... touch threshold, 60 ... operation part, 61 ... operation surface, 62 ... back surface, 90 ... thumb, 91 ... index finger, 92 ... middle finger, 93 ... ring finger, 94 ... little finger, 400 ... biometric information

Claims (5)

A vibration applying unit for applying vibration to the transmission member;
A vibration detection unit that detects vibration transmitted through a path in order of the transmission member, the vibration adding unit, the transmission member, a part of the body of the person to be authenticated that contacts the transmission member, and the transmission member;
Based on the vibration added by the vibration adding unit and the vibration detected by the vibration detecting unit, the biometric information of the authentication target person is calculated, and the calculated biometric information of the authentication target person and the registrant registered in advance are calculated. An authentication unit that compares biometric information and authenticates whether the person to be authenticated is the registrant;
A biometric information authentication device. The authentication unit calculates the biological information using at least one of a phase difference, an amplitude ratio, and a frequency component between a drive signal supplied to the vibration adding unit and a detection signal detected by the vibration detection unit.
The biometric information authentication device according to claim 1. The vibration applying unit and the vibration detecting unit are configured by a piezoelectric element, and detect a load applied to the transmission member.
The authentication unit determines a touch on the transmission member of the person to be authenticated based on the detected load, and starts an authentication operation.
The biometric information authentication device according to claim 1 or 2. The vibration adding unit and the vibration detecting unit are constituted by piezoelectric elements, and their functions are exchangeable.
The biometric information authentication device according to any one of claims 1 to 3. The vibration adding unit and the vibration detecting unit are disposed adjacent to each other.
The biometric information authentication device according to any one of claims 1 to 4.

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