JP2016224692A - Finger vein authentication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a finger placing stand capable of viewing a finger placement state from an outside to avoid reduction in authentication rate due to a compression of a vein on a palm side of a finger.SOLUTION: A finger vein authentication device implementing biological authentication by means of a finger vein comprises: a light source; an imaging unit; a control unit that extracts information based on the finger vein; a finger placing stand where the finger is put in place: a first guide part that is provided on the finger placing stand, and indicates a position of a first end part of the finger; a first sensor that detects that the first end part of the finger contacts with a first specification position specified by the first guide part; a second guide part that is arranged at a position opposing the finger placing stand, and guides a second end part to a second specification position; and a second sensor that detects that the second end part of the finger contacts with the second specification position specified by the second guide part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a finger vein authentication device and is preferably applied to a finger vein authentication device provided with a guide mechanism.

  In recent years, biometric authentication using personal biometric information such as fingerprints, irises, and blood vessel patterns has attracted attention as a personal authentication means for magnetic cards and IC cards in financial institutions. In particular, the finger vein authentication method that uses the vein pattern on the palm side of the finger is not associated with a criminal investigation like a fingerprint, or does not irradiate light directly on the eyeball like an iris. In addition, there is an advantage that counterfeiting is difficult because of the internal characteristics rather than the biological surface that can be easily observed.

  When performing personal authentication with such a finger vein authentication device, there are cases in which personal authentication fails even though the user is the person because the finger placement is not constant. As one of the cases where the personal authentication fails, there is a case where the palm side of the finger is strongly pressed when placing the finger on the apparatus. The finger's blood pressure is pressed by the finger's palm-side pressing, and the vein pattern changes, which is a cause of authentication failure.

  For example, Patent Document 1 discloses an authentication device that, as a technique for avoiding the pressing of the finger, provides an insertion hole for inserting a finger in the housing and places the finger while making the upper side of the finger contact the inner upper surface of the housing. Has been. Further, Patent Document 2 discloses an authentication device in which a finger pressing unit is provided at the upper part of the entrance of an insertion hole for inserting a finger, and the finger is placed while applying the base of the finger to the pressing unit.

JP 2014-99149 A JP 2004-49705 A

  However, in Patent Document 1 and Patent Document 2, since the finger is inserted into the housing through the insertion hole provided in the authentication device, the user himself / herself can visually confirm the finger position and the finger placement state. There was a problem that I could not. Also, if the finger pressing part is provided only at the entrance of the insertion hole, the placement from the base of the finger to the tip of the finger cannot be fixed, so there is a degree of freedom in the placement of the finger. There is a high possibility that the placement will change, leading to a decrease in authentication rate.

  The present invention has been made in consideration of the above points, and an object of the present invention is to propose a finger vein authentication apparatus capable of avoiding a decrease in the authentication rate of personal authentication using information based on finger veins.

  In order to solve such a problem, in the present invention, in a finger vein authentication device that performs biometric authentication using a finger vein, a near-infrared light from a light source unit that irradiates near-infrared light and the light source unit that transmits a user's finger. An imaging unit that images light, a control unit that extracts a vein pattern from an image captured by the imaging unit, a finger placing table on which the finger is placed, a finger placing table provided on the finger placing table, and the first finger A first guide portion indicating the position of the first end portion and a first end portion of the finger that detects that the first end portion of the finger is in contact with a first designated position designated by the first guide portion. A sensor, a second guide portion that is disposed at a position facing the finger rest, guides the second end portion to a second designated position, and a second end portion of the finger includes the second end portion. And a second sensor for detecting that the guide portion of the touch is in contact with the second designated position designated Wherein the finger vein authentication device is provided.

  According to the present invention, it is possible to avoid a decrease in the authentication rate of the finger vein.

It is a block diagram which shows the structure of the finger vein authentication apparatus which concerns on the 1st Embodiment of this invention. It is a conceptual diagram which shows the external appearance of the finger vein authentication apparatus concerning the embodiment. It is sectional drawing of the finger vein authentication apparatus when a finger is placed on the finger rest according to the embodiment. It is the figure seen from the insertion side of the finger of the finger vein authentication apparatus concerning the embodiment. It is the figure which looked at the finger vein authentication device concerning the embodiment from the upper part. It is sectional drawing of the finger vein authentication apparatus which concerns on the 2nd Embodiment of this invention.

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

(1) 1st Embodiment With reference to FIG. 1, the structure of the finger vein authentication apparatus concerning this Embodiment is demonstrated. FIG. 1 shows a configuration diagram of the finger vein authentication device 100. As shown in FIG. 1, the finger vein authentication device 100 includes a control unit 101, a light source unit 102, an imaging unit 103, a fingertip sensor 104, a fingertip LED 105, a finger placement sensor 106, a finger placement LED 107, and a communication unit 108. In addition, the finger vein authentication device 100 is connected to the upper terminal 109 via the communication unit 108. The host terminal 109 includes a bill handling device, an automatic transaction device, a host corresponding to a host device of the automatic transaction device, and the like.

  The control unit 101 may include a processor, a memory, a bus connecting these, and the like. The control unit 101 controls the operation of each component of the finger vein authentication device 100. Specifically, the control unit 101 detects whether the fingertip is in contact with the finger vein authentication device 100 by the fingertip sensor 104, and turns on the fingertip LED 105 when it is determined that the fingertip is in contact. Also, the finger placement sensor 106 detects whether the finger base is in contact with the finger vein authentication device 100, and if it is determined that the finger base is in contact, the finger placement LED 107 is turned on.

  When it is determined that both the fingertip and the finger base are in contact with the finger vein authentication device, the light source unit 102 emits an optimal amount of light for imaging the finger vein, and the imaging unit 103 The vein is imaged.

  The control unit 101 executes the following processing when registering the vein pattern. That is, the control unit 101 extracts a vein pattern serving as feature data at the time of personal authentication from the vein image acquired in the control unit 101, converts this into registration data for personal authentication, and passes the communication unit 108 via the communication unit 108. It transmits to the host terminal 109.

  The control unit 101 executes the following processing when authenticating the vein pattern. That is, the control unit 101 detects whether the fingertip is in contact with the finger vein authentication device 100 using the fingertip sensor 104, and turns on the fingertip LED 105 when it is determined that the fingertip is in contact. Further, the finger placement sensor 106 detects whether the finger base is in contact with the finger vein authentication device 100. When it is determined that the finger base is in contact, the finger placement LED 107 is turned on.

  If the control unit 101 determines that both the fingertip and the base of the finger are in contact with the finger vein authentication device 100, the control unit 101 irradiates the light source unit 102 with an optimal amount of light for imaging the finger vein. A finger vein is imaged by the unit 103. Then, a vein pattern serving as feature data at the time of personal authentication is extracted from the vein image acquired in the control unit 101, and the similarity is calculated by comparing the obtained vein pattern with previously acquired registration data. User authentication is performed based on whether or not the calculated similarity exceeds a predetermined threshold, and the authentication result is transmitted to the upper terminal 109 via the communication unit 108. Note that a part or all of the processing of the control unit 101 when registering the vein pattern and the processing of the control unit 101 when authenticating the vein pattern is performed by the control unit (including a processor, memory, bus, etc.) of the upper terminal 109, etc. May be implemented.

  Next, the external appearance of the finger vein authentication device 100 will be described. FIG. 2 is an external view of the finger vein authentication device according to the present embodiment. As shown in FIG. 2, the finger vein authentication device 100 includes a finger rest 210 for placing a finger, and a filter 213 that blocks light other than near infrared light on the upper surface of the finger rest 210.

  Further, a fingertip guide portion 211 is provided at the tip of the filter 213, and a finger placement guide guide portion 212 is provided so as to cover the finger placement table 210 or to face the finger placement table 210. The fingertip guide part 211 is provided so as to protrude from the upper surface of the finger rest 210 and is formed in an arcuate shape along the fingertip. The finger rest 210, the fingertip guide 211, and the finger rest guide 212 may be molded of plastic or the like.

  As a result, the finger inserted from the finger placement guide part 212 comes into contact with the fingertip guide part 211 and is fixed without being inserted before the fingertip guide part 211. Furthermore, by making the gap between the fingertip guide part 211 and the finger placement guide guide part 212 narrower than the height of the fingertip guide part 211, the finger moves between the fingertip guide part 211 and the finger placement guide guide part 212. The structure does not pass.

  Moreover, since the fingertip guide part 211 is formed in an arcuate shape, the fingertip can be fixed at a fixed position without giving the user unpleasant feeling.

  The finger placement guide part 212 is formed in an arch shape along the length direction of the finger so as to cover the back of the finger, and a part of the finger placement arch shape extends to be installed on the finger placement table. The installation member extending from a part of the finger placement arch shape is formed in a column shape, and fixes the finger placement guide part 212 to the finger placement base. Since the light source 302, the finger placement sensor 106, and the like are built in the finger placement arch shape, the installation member extending from a part of the finger placement arch shape needs a thickness to support the finger placement arch shape. .

  The finger placement guide part 212 is installed on the finger placement base 210 such that the first end on the fingertip side is positioned below the second end on the finger root side. Accordingly, it is possible to guide the fingertip inserted into the finger placement guide part 212 so that the fingertip is downward, and it is easy to insert and remove the finger from above the finger vein authentication device 100.

  Further, the angle between the horizontal surface of the grounding surface and the finger placement guiding guide part 212 is made wider than the angle between the horizontal surface of the grounding surface on which the finger vein authentication device 100 is installed and the finger rest 210. Thereby, a space can be provided between the finger placing table 210 and the finger placing guide part 212, and the finger can be easily taken in and out from above the finger vein authentication device 100.

  In addition, a space is provided between the finger placing table 210 and the finger placing arch shape of the finger placing guiding guide part 212, and the finger side shape of the finger placing guiding guide part 212 is inclined with respect to the finger placing table 210. By adopting the shape, it is possible to guide the insertion of the finger from the obliquely upward direction, and it is easy to insert and remove the finger from above the finger vein authentication device 100. In addition, since a space is provided between the finger placing base 210 and the finger placing arch shape of the finger placing guide part 212, it is possible to maintain the degree of freedom of fingers and palms other than the finger to be imaged for vein imaging. .

  In the present embodiment, as shown in FIG. 2, the case where the ground contact surface of the finger rest 210 is horizontal has been described as an example, but the present invention is not limited to this example. For example, the grounding surface of the finger rest 210 may be a vertical surface or a slope. Also in this case, the same effect as that of the present embodiment can be obtained by setting the positions of the finger placing base 210 and the finger placing guide portion 212 to the above-described configuration.

  A fingertip LED 105 that lights up when the fingertip sensor 104 detects that the fingertip is in contact with the fingertip guide unit 211, and a finger placement LED 107 that lights up when the fingertip sensor 106 detects that the finger is in contact with the finger placement guide part 212. It arrange | positions on the upper surface of the guidance guide part 212. FIG.

  As described above, the fingertip LED 105 and the finger placement LED 107 which are two detection members representing the detection results of the two sensors of the fingertip sensor 104 and the finger placement sensor 106 are arranged on the same surface of the upper surface of the finger placement guide part 212. Thus, it is possible to confirm at a glance the state of the fingertip and the fingertip position at different positions. Further, by disposing the fingertip LED 105 above the fingertip sensor 104 and the finger placement LED 107 above the finger placement sensor 106, either the position of the fingertip or the position of the fingertip is not placed at the designated position. Can be easily grasped. The fingertip sensor 104 and the finger placement sensor 106 may be a pressure sensor, an electrostatic sensor, an optical sensor, an infrared sensor, or the like.

  Next, with reference to FIG. 3, a finger placement guidance method using the finger vein authentication device 100 will be described. FIG. 3 shows a cross section when the cut surface of (a)-(b) in FIG. 2 is viewed in the (X) direction in a state where a finger is placed on the finger vein authentication device.

  As shown in FIG. 3, the user first brings the tip of the finger 314 into contact with the fingertip guide part 211 at the tip of the finger rest 210, and further presses the entire back of the finger 314 against the finger placement guide part 212. To fix.

  As described above, in this embodiment, the fingertip is fixed to the fingertip guide portion 211, and further, the entire back of the finger is fixed to the finger placement guiding guide portion 212. Further, the fingertip sensor 104 is arranged on the palm side of the finger, and the finger placement sensor 106 is arranged on the surface facing the fingertip sensor 104, that is, on the back side of the finger. Thereby, it is possible to image the finger vein in a state in which the degree of freedom of how to place the finger is suppressed.

  Furthermore, since the back side of the finger is fixed along the finger placement guide section 212, a space is created between the palm side of the finger 314 and the finger placing base 210, while avoiding pressing on the palm side of the finger. It has a structure that is easy to guide to how to place it with less freedom.

  Further, since the finger placement guide part 212 does not have a shape that completely covers the finger 314, the user himself or a third party assisting the user from the outside of the finger vein authentication device 100 visually observes how to place the finger 314. You can also check it.

  Also, a fingertip sensor 104 is provided immediately below the top surface of the finger rest 210 on the fingertip side from the fingertip guide portion 211. When contact of the finger 314 is detected by the fingertip sensor 104, the fingertip LED 105 is turned on. Thereby, it is possible to notify the user that the fingertip is correctly touching the fingertip guide portion 211.

  In addition, a finger placement sensor 106 is provided near the finger base side inside the finger placement guide part 212. When the finger placement sensor 106 detects the contact of the finger 314, the finger placement LED 107 is turned on. Accordingly, it is possible to notify the user that the base of the back of the finger is correctly touching the finger placement guide part 212.

  The light source unit 302 is provided in series inside the finger placement guide part 212 from the fingertip side to the finger base side. When the fingertip sensor 104 and the finger placement sensor 106 detect a finger contact, the near-infrared light is emitted from the light source unit 302 to the finger 314. At this time, since the light source on the finger base side of the light source unit 302 has a shorter distance to the finger 314 than the light source on the finger tip side, in order to irradiate the finger 314 with a uniform amount of light from the finger tip to the finger base, The light source on the side preferably suppresses the amount of light applied to the light source on the fingertip side. Therefore, a process for controlling the amount of light to be irradiated may be provided according to the arrangement position of the light source, or a light source having a different amount of light to be irradiated on the fingertip side and the finger base side may be provided.

  In FIG. 3, the light source unit 302 is configured to irradiate from the upper surface of the finger 314. However, the irradiation method is not limited as in this embodiment, and the finger irradiates from the lower surface of the finger 314, obliquely, or the like. The present invention can also be applied to the vein authentication device 100.

  The imaging unit 303 is provided inside the finger rest 210. The imaging unit 303 receives near-infrared light emitted from the light source unit 302 via the filter 213 and images the vein of the finger 314. At this time, the finger 314 is fixed by the fingertip guide part 211 and the finger placement guide part 212, so that the inclination angle of the finger 314 with respect to the finger rest 210 is also constant. By providing the imaging unit base 315 having an inclined shape parallel to the inclination in the finger rest 210 and providing the imaging unit 103 thereon, the imaging plane of the finger 314 and the imaging unit 303 is in a parallel positional relationship. Thereby, the distance from the imaging unit 103 to the fingertip side and the finger base side of the finger 314 is constant, and the vein of the finger 314 can be uniformly imaged.

  4 shows the finger vein authentication device 100 of FIG. 2 as viewed in the (Y) direction, that is, the finger vein authentication device 100 as viewed from the finger insertion side.

  The finger placement guide part 212 has an arch shape that matches the roundness of the finger back side, and is provided on the finger placement base 210 so as to cover the filter 213. This has an effect of preventing external light from above the finger vein authentication device from entering the filter 213. In FIG. 4, no partition is provided on the left and right sides of the filter 213, and the filter 213 and the finger rest 210 are shaped so as to be easily cleaned. May be arranged.

  FIG. 5 shows a view when the finger vein authentication device 100 of FIG. 2 is viewed in the (Z) direction, that is, when the finger vein authentication device 100 is viewed from above.

  On the upper surface of the finger placement guidance section 212, a fingertip LED 105 for visually notifying where the fingertip has been placed and a finger placement LED 107 for visually notifying that the back of the finger has been placed are provided. ing. As described above, the fingertip LED 105 can be used to confirm whether the fingertip is placed at a fixed position, and the finger placement LED 107 can be used to confirm whether the fingertip is placed at a fixed position. As described above, the fingertip LED 105 is arranged at the upper part of the fingertip side, and the finger placement LED 107 is arranged at the upper part of the fingertip side, thereby making it possible to confirm at a glance whether the fingertip and the fingertip are placed at a fixed position. .

  In the present embodiment, the fingertip LED 105 and the finger placement LED 107 are arranged on the upper part of the finger placement guidance guide portion 212, but the present invention is not limited to this example. It may be provided on the table 210.

(2) Second Embodiment FIG. 6 is a sectional view of a finger vein authentication device 100 ′ according to this embodiment. The finger vein authentication device 100 ′ of the present embodiment is different from the first embodiment in that the finger vein authentication device 100 ′ has a finger placement table 210 ′ in which the finger placement table 210 of the finger vein authentication device 100 shown in FIG. Is different.

  The finger vein authentication device 100 ′ of the present embodiment has the same configuration as that of the first embodiment except that an inclined finger rest 210 ′ is provided, and detailed description thereof is omitted. As described above, the finger vein authentication device of the present invention is not limited to the horizontal finger rest shown in the first embodiment, but the inclination of the finger 314 and the imaging unit base 315 as shown in FIG. A similar effect can be obtained with the finger rest 210 'having a parallel inclined shape.

  By making the finger rest 210 'in an inclined shape in this way, the filter 213 provided on the finger rest 210' and the imaging unit base 315 have a parallel positional relationship. As a result, the imaging unit 103 can receive near-infrared light emitted from the light source unit 302 and incident on the filter 213 without omission.

  As mentioned above, although it demonstrated in detail using 1st Embodiment and 2nd Embodiment, this invention is not limited to these embodiment. For example, what is necessary is just to have a detection sensor in the 1st guide part on a finger stand, the 2nd guide part which opposes a finger rest, and each guide part. With this configuration, it is possible to detect the contact between the palm and back of the finger, and it is possible to stably acquire and extract finger vein information when registering or authenticating the finger vein It becomes. Furthermore, the structure which provides a space between a finger rest and a finger may be taken. Thereby, it becomes possible to suppress disturbance of the vein information of the finger due to the compression.

DESCRIPTION OF SYMBOLS 100 Finger vein authentication apparatus 101 Control part 102 Light source part 103 Imaging part 104 Finger tip sensor 106 Finger placement sensor 108 Communication part 109 Host terminal 210 Finger placing stand 211 Finger tip guide part 212 Guidance guide part 213 Filter 302 Light source part 303 Imaging part 314 Finger 315 Imaging unit base

Claims (8)

In a finger vein authentication device that performs biometric authentication using a finger vein,
A light source that emits near-infrared light;
An imaging unit that images near-infrared light from the light source unit that has passed through the user's finger;
A control unit that extracts a vein pattern from an image captured by the imaging unit;
A finger rest on which the finger is placed;
A first guide provided on the finger rest and indicating a position of a first end of the finger;
A first sensor for detecting that a first end of the finger is in contact with a first designated position designated by the first guide;
A second guide portion disposed at a position facing the finger rest and guiding the second end portion to a second designated position;
A second sensor for detecting that the second end portion of the finger is in contact with a second designated position designated by the second guide portion;
A finger vein authentication device comprising: A first detection member that lights when the first sensor detects that the first end of the finger is in contact with the first designated position;
A second detection member that lights when the second sensor detects that the second end of the finger is in contact with the second designated position;
The finger vein authentication device according to claim 1, comprising: The first guide portion indicates a position on a fingertip side of the finger;
The second guide portion indicates a position of a root side of the finger;
The finger vein authentication device according to claim 2, wherein the first guide part is located below the second guide part. Arranging the first sensor and the second sensor on opposite surfaces;
The finger vein authentication device according to claim 3, wherein: The first sensor is disposed on the palm side of the finger,
The second sensor is disposed on the back side of the finger.
The finger vein authentication device according to claim 4, wherein The first guide portion has a predetermined height,
The finger vein authentication device according to claim 5, wherein a space between the first guide part and the second guide part is narrower than a height of the first guide part. The imaging unit is provided inside the finger rest,
The finger vein authentication device according to claim 1, wherein the imaging unit is provided on an inclined imaging unit base provided in the finger rest. The finger vein authentication device according to claim 1, wherein the finger rest is inclined.

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