CN108780563B

CN108780563B - Biometric authentication device

Info

Publication number: CN108780563B
Application number: CN201680083329.6A
Authority: CN
Inventors: 喜种佳司
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2016-06-06
Filing date: 2016-06-06
Publication date: 2022-05-10
Anticipated expiration: 2036-06-06
Also published as: GB2565446B8; CN108780563A; JP6638067B2; JPWO2017212513A1; GB2565446A; WO2017212513A1; GB2565446B; GB201814817D0

Abstract

Since the width of the finger varies individually, it is difficult to set the finger to the same position every time the finger is positioned by a guide portion or the like for both the thin finger and the thick finger, and thus deterioration of the authentication accuracy cannot be avoided due to a shift in the position at which the finger is positioned. A biometric authentication device for performing authentication based on biometric information, comprising a fingertip placement section including a fingertip bottom surface section, a fingertip surface section, and a fingertip side surface section; the bottom face part of the finger tip is contacted with the finger abdomen part of the finger; a finger tip face portion connected substantially perpendicularly to the finger tip bottom face portion and having a face that contacts the tip of a finger at a predetermined angle; the finger tip side surface portion is connected to the finger tip surface portion and the finger tip bottom surface portion, and has a surface facing the side surface of the finger.

Description

Biometric authentication device

Technical Field

The present invention relates to a biometric authentication device.

Background

A biometric authentication apparatus that authenticates a user using biometric information is used in various devices and systems. When performing identity authentication using a biometric authentication device, a user reads biometric information by performing an operation of covering or watching a predetermined part of the body such as a finger or an eye on the authentication device (authentication operation), compares a feature amount extracted from the biometric information with a feature amount of biometric information registered in advance by the user to calculate a comparison matching degree, and determines the user based on whether the matching degree exceeds a predetermined threshold.

The background art of the present invention is disclosed in japanese patent application laid-open No. 2011-2988 (patent document 1). In this publication, it is described that "even a finger of a child whose finger is short and thin can perform authentication processing without preparing a dedicated finger vein authentication device separately from an adult. "in the specification abstract. Further, as another background art, there is japanese patent laid-open No. 2013-149115. In this publication, it is described that "a finger vein authentication apparatus capable of reducing a decrease in authentication rate due to the compression of veins at the finger root portion is provided. "in the specification abstract.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2011-2988

Patent document 2: japanese patent laid-open publication No. 2013-149115

Disclosure of Invention

Problems to be solved by the invention

In a biometric authentication device such as a fingerprint authentication device or a finger vein authentication device that places a finger at a set position and acquires biometric information using various sensors such as a camera or an electrostatic sensor, it is difficult to place the finger at the set position for each authentication. Therefore, there is a problem that authentication accuracy is deteriorated due to different biometric information that can be acquired at the time of registration and at the time of authentication.

In order to solve this problem, in the conventional biometric authentication device, a depression similar to the shape of a fingertip as shown in fig. 7 is provided in a portion where the fingertip is placed, and the fingertip is restricted from moving forward, backward, leftward, and rightward, so that the finger can be placed at the same position every time. However, the finger thickness varies from person to person, and when a finger thinner than the depression is placed, the lateral shift cannot be restricted.

Further, japanese patent application laid-open No. 2011-2988 proposes a device that can cope with both a long finger and a short finger by providing an intermediate guide portion. However, since this device is compatible with fingers of various lengths, when a short finger does not reach the front guide portion, the movement in the front-rear direction cannot be restricted, and it is difficult to restrict the shift in the front-rear direction.

Further, japanese patent application laid-open No. 2013-149115 proposes a device that restricts the lateral shift of a finger regardless of the thickness of the finger by placing the finger on a V-shaped finger placement table. However, since the distance from the imaging element is different between a thin finger and a thick finger, if the focal distance is matched to one of the fingers, the other finger may be out of focus and an accurate image may not be captured.

Therefore, the present invention provides a biometric authentication device that can perform stable finger placement even when the finger has individual differences in thickness.

Means for solving the problems

As one of the means for solving the above problems, there is provided a biometric authentication device for performing authentication based on biometric information, comprising a fingertip placement section including a fingertip bottom surface section, a fingertip face section, and a fingertip side surface section; the finger tip bottom surface portion is in contact with a finger web portion of a finger, the finger tip bottom surface portion is connected to the finger tip bottom surface portion substantially perpendicularly, and has a surface in contact with a tip of the finger at a predetermined angle, and the finger tip side surface portion is connected to the finger tip bottom surface portion and has a surface facing a side surface of the finger.

Effects of the invention

According to the present invention, in the biometric authentication device that obtains biometric information by placing a finger at a set position, the finger can be placed while suppressing positional deviation regardless of the thickness of the finger. This makes it possible to acquire the same biometric information at the time of registration and at the time of authentication, and thus, the authentication accuracy of biometric authentication can be improved.

Problems, structures, and effects other than those described above will become more apparent from the following description of the embodiments.

Drawings

Fig. 1 is an external view showing the overall shape of the finger vein authentication apparatus.

Fig. 2 is a block diagram showing the device configuration of the finger vein authentication device.

Fig. 3 is a diagram showing the shape of the fingertip placement unit.

Fig. 4 is a diagram showing the shape of the fingertip placement unit.

Fig. 5 is a flowchart showing a transaction using the finger vein authentication apparatus.

Fig. 6 is a diagram showing a screen displayed on the display unit of the finger vein authentication apparatus.

Fig. 7 is a diagram showing the shape of a fingertip placement part of a conventional finger vein authentication device.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a description will be given of a vein authentication apparatus as an example of a biometric authentication apparatus.

Example 1

Fig. 1 is an external view showing the overall shape of a finger vein authentication apparatus 100 to which the present embodiment is applied. Fig. 1(a) is a plan view of the finger vein authentication apparatus 100 as viewed from above. Fig. 1(b) is a right sectional view taken along line a-a shown in the plan view of fig. 1 (a). Fig. 1(c) is a perspective view of the finger vein authentication apparatus 100 viewed from obliquely above.

The fingertip face 101 is a face that comes into contact with the tip of a finger 116 placed on the finger vein authentication apparatus 100. The fingertip side surface portion 102 is a surface that contacts the side surface of the tip end portion of the finger 116. The fingertip bottom surface portion 103 is a surface that contacts the bottom surface of the tip portion of the finger 115 (also referred to as a finger pulp portion). The fingertip guide 104 is a semicircular guide for displaying a finger placement position for a person using the finger vein authentication apparatus 100. The fingertip surface portion 101, the fingertip side surface portion 102, and the fingertip bottom surface portion 103 may be collectively referred to as a fingertip placing portion 105. The fingertip guide 104 may be added to the fingertip placement unit 105. The fingertip placement unit 105 will be described in detail later. The tip of the finger 116 is described as extending from the first joint of the finger 116 to the tip, but may include portions before and after the first joint depending on individual differences.

The finger base placement unit 106 is a support unit that supports the base of the finger 116 presented to the finger vein authentication apparatus 100. The near-infrared light emitting section 109 emits near-infrared light from both sides of the finger placed on the fingertip placement section 105 and the base placement section 106 toward above the side of the finger 116. In the present embodiment, the light is emitted from both sides of the finger 116, but the light may be emitted from one side by adjusting the arrangement of the near-infrared light emitting unit 109. The imaging window 107 is located between the fingertip placement unit 105 and the base finger placement unit 106, is located in the vicinity of the first joint to the 2 nd joint of the finger 116 to be placed, and is configured so as not to directly contact the finger with a step. Further, the imaging window 107 is provided with a near infrared transmission filter that transmits only a long wavelength of near infrared rays or more, and the influence of external light such as sunlight irradiated from the outside of the near infrared light emitting unit 109 to the finger 116 is reduced. As the filter, in addition to a near infrared light transmission filter that transmits a long wavelength of near infrared rays or longer, a band pass filter that transmits only near infrared light by cutting both a wavelength shorter than near infrared rays and a wavelength longer than near infrared rays may be used. An imaging unit 108 that images transmitted light emitted from the near-infrared light emitting unit 109 and transmitted through a finger 116 is provided below the imaging window 107 (on the bottom surface side of the device).

The input unit 110 receives an input from an operator when the finger vein authentication apparatus 100 is operated. In the present embodiment, 4 input units 110-1 to 110-4 are provided, and functions are assigned as a button 110-1 (SELECT) for selecting display contents, buttons 110-2 and 110-3 (displaying a triangular figure) for switching display contents, and a button 110-4 (ENTER) for determining input. The number of input units 110 is not limited to 4, and functions assigned to the input units 110 may be assigned to functions other than those described in the present embodiment.

The display unit 111 is a display unit that displays information such as authentication success or authentication failure when biometric authentication is performed. The display device is constituted by a display device such as an LCD or an organic EL. The screen displayed on the display unit 111 will be described later. The display unit 111 and the input unit 110 may be integrated into one unit as in a touch panel.

The SIM card slot 112 has a cover shape, and if the cover is opened, the SIM card is inserted into and removed from an accessible slot, not shown. The inserted SIM card can store a template of biometric information used for authentication, and the like, and is used for authentication. Further, a control chip may be provided in the SIM card, and in-card authentication may be performed using the control chip.

The LED113 is a light emitting unit capable of indicating the state of the finger vein authentication apparatus 100. For example, when the finger vein authentication apparatus 100 is connected to an external device not shown using the external connection I/F114 described later and is charged, it can be indicated that the charging is being performed by causing the LED to emit red light. Further, a color indicating authentication failure may be emitted when biometric authentication fails.

The external connection I/F114 is a connection unit used when the finger vein authentication apparatus 100 is connected to an external apparatus not shown. In the present embodiment, the external connection I/F114 is described as USB (universal Serial bus), but the external connection I/F is not limited to USB and may have other communication standards. The external device is a computer or the like having an external connection I/F114 connectable to the computer or the like. In order to distinguish the external connection I/F114 from the wireless communication unit 203 described later, it may be referred to as a wired communication unit.

The switching unit 115 is a switching unit that switches ON/OFF of the power supply of the finger vein authentication apparatus 100 and switches the connection between the finger vein authentication apparatus 100 and an external apparatus. In the present embodiment, the connection to an external device is described assuming that the connection includes both a connection using the external connection I/F114 and a connection using wireless communication. As shown in fig. 1C, the switching unit 115 can switch 3 places, i.e., left (arrow B direction), center, and right (arrow C direction). For example, when the direction is switched to the left (arrow B), the connection by USB is selected, and when the direction is switched to the right (arrow C), the connection by wireless communication is selected. Further, the center selection power is turned off. In the present embodiment, Bluetooth (registered trademark) is used for wireless communication, but a specification for wireless communication other than Bluetooth (registered trademark) may be attached.

The step 119 is a step provided between the fingertip bottom surface portion 103 and the imaging window portion 107. Further, the step 120 is a step provided between the finger base placement section 106 and the photographing window section 107. The portions indicated by the dotted circles correspond to the respective steps, and the details thereof will be described later.

Fig. 2 is a block diagram illustrating an apparatus configuration of the finger vein authentication apparatus 100 according to the present embodiment. The configuration described above is not repeated.

The finger vein authentication apparatus 100 includes a CPU201, a memory 202, a wireless communication unit 203, an external connection I/F114, a power supply unit 204, a SIM card slot 112, a fingertip sensor 205, a finger base sensor 206, a display unit 111, an imaging unit 108, a near infrared light emitting unit 109, an input unit 111, an LED113, a switching unit 115, and a sound output unit 207, and is connected by a BUS or a circuit.

The CPU201 is a control unit that controls each configuration of the finger vein authentication apparatus 100. The memory 202 is a storage unit that stores information (wireless connection information 202-2) and the like necessary for control, in addition to programs (authentication program 202-1 and control program 202-3) executed by the CPU 201.

The wireless communication unit 203 is a communication unit that wirelessly connects the finger vein authentication apparatus 100 with an external apparatus. The power supply unit 204 is a battery that supplies power to the finger vein authentication apparatus 100. The power supply unit 204 can charge the battery when the external connection I/F114 is connected to an external device.

The fingertip sensor 205 is a sensor provided on the fingertip bottom surface portion 103, and detects whether or not a fingertip is placed. The finger base sensor 206 is a sensor provided in the finger base placement unit 106, and detects whether or not a finger base is placed. In the present embodiment, the fingertip sensor 205 and the base finger sensor 206 are described by taking an electrostatic sensor as an example, but sensors other than the electrostatic sensor may be used. Further, the sensor may be a sensor that detects that a finger is covered by the sensor when a physical switch is pressed.

The sound output unit 207 is a device such as a buzzer for sounding an error sound when biometric authentication fails, or an electronic sound when power is supplied to the finger vein authentication device 100.

In the present embodiment, for the sake of simplicity of explanation, a description is given of control mainly performed by a program, but the program is actually executed using hardware resources such as the CPU described above.

Fig. 3 is an enlarged view of the vicinity of the fingertip placement part 105 and the finger root placement part 106 of the finger vein authentication device 100 as enlarged from obliquely above. Fig. 4(a) is an enlarged plan view of the acutely placed part 105, and fig. 4(b) is a right sectional view taken along line a-a in fig. 4 (a). Fig. 4(c) is a diagram showing a state in which a thin finger 117 is placed on the fingertip placement unit 105. Fig. 4(d) is a diagram showing a state in which the thick finger 118 is placed on the fingertip placing unit 105. The details of the finger placement unit 105 according to the present embodiment will be described with reference to fig. 3 and 4.

As described above, the finger placement section 105 of the present embodiment is constituted by the fingertip face section 101, the fingertip side face section 102, and the fingertip bottom face section 103.

The fingertip surface portion 101 is a surface provided substantially vertically upward from the fingertip bottom surface portion 103, and is configured to be supported by being in contact with fingertips on both surfaces. As shown in fig. 4(a), the triangular shape is formed as viewed from above. The angle a formed by the two sides of the triangle is an obtuse angle, and is preferably set to about 120 degrees so that the tip of the finger comes into contact with the two sides of the triangle when the thin finger is pressed against the triangle, the fingertip can be naturally guided to the center portion, and the thick finger does not interfere with the fingertip and affect the image capturing of the living body image when placed. The height b of the fingertip face portion 101 is preferably such a height that the fingernail does not interfere with the fingertip portion 100 and does not get over the wall surface when the finger 116 is touched because it is too shallow. Conversely, when the height is high, the finger does not go over the wall surface, but the nail comes into contact with the fingertip surface portion 101, and the finger cannot be placed at the correct position. In the present embodiment, the height is about 5mm from the fingertip bottom surface portion 103.

The fingertip side surface portion 102 is a support portion which is connected to the fingertip surface portion 101, is provided substantially vertically upward from the fingertip bottom surface portion 103, and supports the finger placed thereon from both the left and right sides. The distance c between the finger tip side surface portions 101 is preferably set to about 15 to 20mm so as not to interfere with the placement of a thick finger. In addition, when the finger to be placed is a thin finger, the fingertip side surface part 102 does not contact the finger or partially contacts the finger. Therefore, the fingertip side surface part 102 can be said to be a surface at a position facing the side surface of the finger. The fingertip side surface portions 102 themselves are also located at positions facing each other. The fingertip bottom surface portion 103 is formed into a pentagonal shape as viewed from above due to the shapes of the fingertip surface portion 101 and the fingertip side surface portion 102 connected to each other and the step 119.

In the present embodiment, it is assumed that the fingertip placement part 105 is formed by processing a resin and integrally molding the resin in order to improve productivity. Therefore, the fingertip surface portion 101 and the fingertip side surface portion 102 are formed substantially perpendicular to the fingertip bottom surface portion 103. The connecting portion between the fingertip surface portion 101 and the fingertip bottom surface portion 103 is not perpendicular but has a gentle curve. The same applies to the connection portion between the fingertip side surface portion 102 and the fingertip bottom surface portion 103. However, each of the finger tip placement units may be formed of different parts and then manufactured as 1 finger tip placement unit 105. In this case, the connection portions of the respective portions may be connected vertically.

Here, before explaining the effects of the fingertip placement unit 105 of the present embodiment, the problems of the conventional fingertip placement unit will be explained. Fig. 7(a) is a diagram showing the shape of a fingertip placement part 701 of a conventional finger vein authentication device. Fig. 7(b) is a right sectional view taken along line D-D of fig. 7 (a). Fig. 7(c) is a diagram showing a state in which a thin finger 117 is placed on the fingertip placing portion. Fig. 7(d) is a diagram showing a state in which the thick finger 118 is placed on the fingertip placing portion.

The conventional finger placement section shown in fig. 7 has a relatively circular shape (hereinafter, referred to as a conventional shape 701) matching the shape of a finger, and the width is generally about 15mm matching a relatively thick finger. In the case of the conventional shape 701, since the shape is associated with a fingertip, there is an advantage that the user can intuitively determine where to place the finger. However, when a thin finger 117 having a fingertip width of about 10mm is placed as shown in fig. 7(c), a gap is formed between the finger placing portion and the finger side surface in the conventional shape 701, and therefore, even if a shift 702 of the finger center portion occurs, the finger can be placed. Further, since the portion against which the finger abuts is semicircular and does not have a shape that restricts movement in the left-right direction, the user can place the finger at a position that is displaced without any restriction.

If the position of the finger is displaced between the registration and the authentication, the images of the finger captured by the imaging unit 108 are different between the registration and the authentication, and therefore, the possibility of recognizing the finger as another person although the person is the same person or as the person while the person is the other person is high, and therefore, the authentication accuracy is lowered in the conventional shape 701.

In order to prevent the fingers from shifting when the thin fingers 117 are placed, the width of the portion where the fingers are placed needs to be narrowed, but if the width is narrowed in order to cope with the thin fingers 117, when the thick fingers 118 are placed, there occurs a problem that the fingertips do not enter the portion where the fingers are placed.

As described above, in the conventional shape 701, there is a problem that it is difficult to accurately place a finger having personal difference such as the thin finger 117 and the thick finger 118.

In the shape of the present embodiment, when the thin finger 117 is placed, the finger 117 is abutted against both sides of the triangular portion of the fingertip face portion 101 as shown in fig. 4(c), and the finger is naturally guided to the central portion by the angle a formed by both sides of the fingertip face portion 101, so that the finger can be placed at the same position in the central portion every time.

Further, as shown in fig. 4(d), when the finger 118 having a large width is placed, the finger tip face portion 101 and the finger side face portion 102 restrict the front-back and left-right movement in the shape of the present embodiment, and therefore the finger can be placed at the same position every time.

As described above, the shape of the present invention enables the finger to be placed at the same position in both the thin finger 117 and the thick finger 118. Therefore, deterioration of authentication accuracy due to positional displacement of the finger can be prevented.

Note that the conventional shape 701 is a shape that can be placed with a finger when the finger is placed and can also be pressed. If the finger is strongly pressed, blood flow of a blood vessel of the finger is obstructed, and imaging and authentication of a finger vein may be affected. On the other hand, in the shape of the present embodiment, since the finger is supported by both surfaces of the fingertip face portion 101, the finger is not strongly pressed. Therefore, the blood flow is not obstructed, and the imaging and authentication of the finger vein are less affected. In particular, if a case is considered in which a finger is pushed to the back side (the direction of arrow B) of the device, the entire finger including the finger pad is pushed in the conventional shape, but the shape of the present embodiment has little influence because the finger presses the surface contacting the fingertip face portion 101.

Further, in the present embodiment, as shown in fig. 3, a semicircular step is provided outside the fingertip face portion 101 as a fingertip guide portion 104 indicating a finger shape. With this configuration, as in the conventional shape, the shape of the fingertip can be assumed by the user using the finger vein authentication apparatus 100, and the user can easily determine that the finger is placed. The fingertip guide 104 may be represented by a color difference in a semicircular step by painting, for example. In other words, the semicircular edge may be painted in a shape that is reminiscent of a finger.

Fig. 1(b) shows a right sectional view of the finger vein authentication apparatus 100 cut along line AA. As can be seen from the right sectional view, a level difference 119 is provided on the surface where the fingertip placement unit 105 and the imaging window unit 107 are located. Similarly, a step 120 is provided on the surface where the finger base placement unit 106 and the imaging window unit 107 are located. By providing the steps in the fingertip placement unit 105, the base finger placement unit 106, and the imaging window unit 107, there is an effect that the blood flow of the fingertip and the base finger is not obstructed. In other words, even when the finger 118 is pressed against the fingertip or the base finger 105 or the base finger 106 with a force, the blood flow can be secured by the step, and the vein can be imaged.

In the case where there are no

level differences

119 and 120, if the finger is strongly pressed, the skin of the finger may be stretched in the peripheral portion of the imaging window 107, and the vein may be compressed and not visible. However, by providing the

steps

119 and 120 at a predetermined interval from the imaging window 107, the portion that cannot be seen by pressing can be made to be the outside of the imaging window 107, and the vein image can be normally imaged even when the finger is strongly pressed. In addition, the above-described effect is also obtained when only one of the

steps

119 and 120 is provided.

Next, the finger vein authentication process according to the present embodiment will be described with reference to fig. 5. Fig. 5 is a flowchart illustrating an authentication process and a transaction.

In the present embodiment, a description will be given of a state in which a template of biometric information (finger vein) used for authentication is already provided. Since the method of creating a template of biological information is already well known, the description thereof will be omitted. It is assumed that a template of biometric information is stored in an unillustrated SIM card. Here, the transaction explained here will be explained by taking the transaction settlement of a bank as an example. Specifically, a description will be given of a process in which a person who has a settlement right signs using a finger vein when performing settlement processing at a bank.

First, the finger vein authentication apparatus 100 receives settlement information from an external apparatus (S11). In the present embodiment, the settlement information is received from the external device at the timing of performing the settlement processing, but the settlement information may be received from the external device in advance, and the settlement processing may be performed at an arbitrary timing.

The received settlement information is displayed on the display unit 111 (S12). Information displayed on the display unit 111 will be described with reference to fig. 6. Fig. 6(a) is a 1 st screen 601 of the settlement processing displayed on the display unit 111, and fig. 6(b) is a 2 nd screen 602 of the settlement processing displayed on the display unit 111. As shown in the 1 st screen 601 and the 2 nd screen 602, the screens can be switched and used by the input of the input unit 110, such as "1/2" and "2/2". This is because the number of characters that can be displayed on the display unit 111 is limited. Here, the explanation will be given taking, as an example, the settlement related to the transfer transaction in which "2,000,000 USD" is transferred to the account number "1234567" as shown in the 2 nd screen 602. Since the settlement processing can be performed after the contents of the transaction are confirmed on the display unit 111 of the finger vein authentication apparatus 100 in this manner, even when the display screen of the external apparatus is tampered with maliciously and is not displayed correctly, for example, the correct transaction and transfer destination can be displayed on the finger vein authentication apparatus 100 side, and the transaction can be performed safely.

The information displayed on the display unit 111 is confirmed, and whether to continue the transaction or to interrupt the transaction is input through the input unit 110. Specifically, the confirmation button is pressed when the transaction is continued, and the cancel button is pressed when the transaction is interrupted (S13). When the cancel button is pressed (S13: cancel), an error message is displayed to interrupt the transaction (S20), and the operation ends. On the other hand, when the confirmation button is pressed (S13: confirmation), the procedure proceeds to the finger vein authentication step.

In the step of finger vein authentication, first, the display unit 111 displays the finger 116 (S14). When it is detected that the finger 116 is placed on the fingertip placement part 105 and the base placement part 106 by the outputs from the fingertip sensor 205 and the base sensor 206, the near infrared light emitting part 109 emits near infrared light toward the finger 116, and the imaging part 108 images the transmitted light that has passed through the finger 116.

After the end of the finger vein imaging, it is checked whether the imaging is correctly ended (S15). If the finger vein image cannot be captured correctly due to the influence of external light or the like (no in S15), the screen requesting the presentation of the finger 116 is displayed on the display unit 111 again. When the finger vein image is correctly captured (yes in S15), the process proceeds to the next finger vein authentication process (S16).

In the finger vein authentication processing (S16), the feature amount used for finger vein authentication is calculated from the finger vein image captured by the imaging unit 109, and matching is performed with the template of the biometric information stored in the SIM card. If the result of the matching is an evaluation result higher than a preset threshold, it is determined that the authentication is successful, and if the result of the matching is lower than the threshold, it is determined that the authentication is failed. The details of the feature amount calculation method and the matching are already known, and therefore, the description thereof is omitted. The matching may be performed by the finger vein authentication apparatus 100, may be performed in a SIM card, or may be performed using both of them. When the authentication process is performed by both the device 100 and the SIM card, the security is higher than when either one is performed.

When the authentication process is performed and the authentication is failed (NO in S17), a display showing the authentication failure and a screen for confirming whether or not to retry the authentication are displayed on the display unit 111, and when the retry is performed (YES in S19), the process returns to step 14 and the same process is performed. If the retry is not performed (no in S19), an error is displayed and the process is ended.

If the authentication is successful (yes in S17), a message that settlement processing can be executed is transmitted to the external device, and the process ends (S18).

As described above, the finger vein authentication apparatus 100 according to the present embodiment can place a finger at the same position even if the finger 116 is different (thin or thick) individually by providing the finger placement section 105 including the finger tip face 101, the finger tip side face 102, and the finger tip bottom face 103.

Further, by providing the fingertip guide 104 on the fingertip placement unit 105, the placement location of the finger can be made more clear to the person who is going to use the authentication. Further, by providing a level difference to the surfaces of the fingertip placement unit 105, the base finger placement unit 106, and the imaging window unit 107, it is possible to acquire a finger vein image without interfering with the blood flow of the finger 116.

Further, by displaying information on the transaction on the display unit 111, even if the external device is changed in display of the screen by a malicious person, the correct transaction information is known, and thus a normal transaction can be performed.

Example 2

In example 1, the finger vein is acquired as the biological information, but the present invention can be applied to the case of acquiring biological information other than the finger vein.

For example, the fingertip sensor 205 located on the fingertip bottom surface portion 103 can be used as a fingerprint authentication device for performing authentication with a fingerprint by forming the fingertip bottom surface portion 103 of a transparent material so as to be capable of capturing a fingerprint. In addition, not only authentication using only a fingerprint, but also so-called multi-modal application using both a fingerprint and a finger vein can be performed. By using a plurality of pieces of biological information, safety can be further improved.

The present invention is not limited to the above-described embodiments. For example, the above-described embodiments are described in detail to facilitate understanding of the present invention, and are not necessarily limited to having all of the structures described. Further, a part of the structure of a certain embodiment may be replaced with the structure of another embodiment, and the structure of another embodiment may be added to the structure of a certain embodiment. Further, a part of the configuration of each embodiment may be added, deleted, or replaced with another configuration.

Description of the reference symbols

100: a finger vein authentication device; 101: a finger tip face portion; 102: a fingertip side surface portion; 103: the finger tip bottom face part; 104: a fingertip guide part; 105: a fingertip placing part; 106: a finger root placing part; 107: a shooting window section; 108: a shooting part; 109: a near-infrared light emitting section; 110: an input section; 111: a display unit; 112: a SIM card slot; 113: an LED; 114: an external connection I/F; 115: a switching unit; 119; 120: step difference

Claims

1. A biometric authentication device for performing authentication based on biometric information,

a fingertip placement section including a fingertip bottom surface section, a fingertip face section, and a fingertip side surface section;

the bottom surface of the fingertip is contacted with the finger belly part of the finger;

a finger tip surface portion connected to the finger tip bottom surface portion substantially perpendicularly, and having a surface that comes into contact with the tip of the finger at a predetermined angle;

the fingertip side surface portion is connected to the fingertip surface portion and the fingertip bottom surface portion, and has a surface facing a side surface of the finger,

the fingertip surface portion has a 1 st surface and a 2 nd surface, and the predetermined angle is an obtuse angle formed by the 1 st surface and the 2 nd surface.

2. The biometric authentication device according to claim 1,

the fingertip placing section includes a semicircular fingertip guide section connected to the fingertip face section.

3. The biometric authentication device according to claim 1,

the disclosed device is provided with:

a finger base placing section which is in contact with the base of the finger; and

a photographing window part for photographing the finger;

forming a 1 st step between the finger tip bottom surface portion and the photographing window portion;

forming a 2 nd step between the finger base placing part and the shooting window part;

the 1 st step and the 2 nd step are disposed at positions apart from the imaging window.

4. The biometric authentication device according to claim 1,

the disclosed device is provided with:

an external connection unit that is connected to an external device in a wired manner and transmits and receives communication;

a wireless communication unit which is connected to the external device in a wireless manner and transmits and receives communication;

a switching unit that switches between input and disconnection of a power supply of the biometric authentication device;

a power supply unit for supplying power by the input of the switching unit; and

and a control unit which turns on power and selects communication through the external connection unit when it is detected that the switching unit is input in a 1 st direction, and turns on power and selects communication through the wireless communication unit when it is detected that the switching unit is input in a 2 nd direction.

5. The biometric authentication device according to claim 4,

the disclosed device is provided with:

a display unit that displays information received from the external device; and

an input unit that operates the display of the display unit;

the control unit switches and displays information that is not displayed on the display unit, among the received information displayed on the display unit, by an input from the input unit.

6. The biometric authentication device according to claim 4,

the disclosed device is provided with:

a slot for reading and writing information from and into the inserted information storage device;

a light emitting unit that irradiates a finger with near infrared light; and

an imaging unit that images transmitted light that has transmitted a finger;

in the case where the biological information is stored in the information storage device,

the control unit performs the matching between the biological information captured by the imaging unit and the stored biological information, or causes the information storage device to perform the matching, or causes the control unit to perform the matching and causes the information storage device to perform the matching.

7. The biometric authentication device according to claim 1,

the fingertip side surface portion includes a 3 rd surface and a 4 th surface facing the 3 rd surface;

the 3 rd surface is connected to the 1 st surface and the fingertip bottom surface portion;

the 4 th surface is connected to the 2 nd surface and the fingertip bottom surface portion.

8. The biometric authentication device according to claim 2,

the fingertip guide portion has a semicircular step and/or has a color different from that of the fingertip placing portion.

9. The biometric authentication device according to any one of claims 1 to 8,

the fingertip face portion, the fingertip side face portion, and the fingertip bottom face portion are integrally formed.