JP7184538B2 - Blood vessel imaging device and personal authentication system - Google Patents

Description

The present invention relates to a blood vessel image capturing apparatus for capturing finger blood vessel patterns, which is human biometric information, and a personal authentication system equipped with the same.

One of the biometric authentication devices capable of highly accurate personal authentication is a blood vessel image capturing device that utilizes blood vessel patterns that differ from person to person. A blood vessel imaging device is a device that performs personal authentication by, for example, taking a picture of a finger's blood vessel pattern that appears when the finger is exposed to light, and comparing the taken blood vessel pattern with a pre-registered finger's blood vessel pattern. be.

Patent Document 1 discloses a walk-through type personal authentication system that performs personal authentication using a blood vessel imaging device without stopping a walking user, and controls an opening/closing gate according to the result of personal authentication. there is Patent Document 1 discloses a configuration elongated in the direction of travel of the user, that is, a finger presenting portion on which a finger is presented and a blood vessel pattern is captured is widened in the direction of travel of the user in order to secure a flow line along which the user walks. is doing.

WO2016/084214

However, Patent Document 1 does not mention miniaturization of the blood vessel imaging apparatus. In order to downsize the blood vessel imaging apparatus, it is also necessary to downsize the finger presentation unit, but simple downsizing results in a decrease in the accuracy of personal authentication. That is, when the width of the finger presentation part becomes narrow, it becomes difficult to present the finger at an appropriate position with respect to the finger presentation part, and the captured blood vessel pattern is often unsuitable for personal authentication.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a blood vessel image capturing apparatus and a personal authentication system capable of improving the accuracy of personal authentication even when the width of a finger presenting portion where a blood vessel pattern of a finger is captured becomes narrow.

In order to achieve the above object, the present invention is characterized in that a finger presenting portion having a flat surface on which a finger is placed protrudes from the housing.

More specifically, a finger presentation unit having a flat surface to which a finger is applied, a light source for irradiating the finger applied to the finger presentation unit with light, and an image of a blood vessel included in the finger irradiated with light is captured. a housing that contains the imaging unit; and an authentication unit that performs personal authentication based on the captured image of the blood vessel, wherein the finger presenting unit is attached to the housing. characterized by protruding from the

Further, the present invention is a personal authentication system comprising the blood vessel image capturing device and a gate section that opens and closes according to the result of personal authentication of the blood vessel image capturing device.

According to the present invention, it is possible to provide a blood vessel image capturing apparatus and a personal authentication system capable of improving the accuracy of personal authentication even when the width of the finger presenting portion where the blood vessel pattern of the finger is captured becomes narrow.

FIG. 2 is a perspective view of the main body of the blood vessel image capturing apparatus according to the first embodiment, viewed obliquely from above; Schematic configuration diagram of the personal authentication system of the first embodiment FIG. 4 is a diagram showing an example of the flow of processing when personal authentication is performed by the blood vessel imaging apparatus according to the first embodiment; FIG. 4 is a perspective view of the main body of the blood vessel image capturing apparatus according to the second embodiment, viewed obliquely from above; FIG. 11 is a perspective view of the main body of the blood vessel image capturing apparatus according to the third embodiment, viewed obliquely from above; FIG. 11 is a perspective view of the main body of the blood vessel image capturing apparatus according to the fourth embodiment, viewed obliquely from above; The figure which looked at the main body of the blood-vessel imaging device of Example 4 from the side. FIG. 11 is a side view of the main body of a blood vessel imaging apparatus according to a modification of the fourth embodiment; FIG. 11 is a side view of the main body of a blood vessel imaging apparatus according to a modification of the fourth embodiment; FIG. 11 is a perspective view of the main body of the blood vessel image capturing apparatus of the modified example of the second embodiment, viewed obliquely from above;

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

A body 100 of the blood vessel imaging apparatus of this embodiment will be described with reference to FIG. FIG. 1 is a perspective view of the main body 100 viewed obliquely from above, where the X direction is the direction in which the user walks, the Z direction is the vertical direction, and the Y direction is the direction orthogonal to the X and Z directions. Main body 100 includes housing 101 , light source array 103 , and imaging unit 106 . Each part will be described below.

The housing 101 has a projecting portion 109 , and the projecting portion 109 has a shape that protrudes from the upper surface of the housing 101 . A finger presenting portion 107 is provided on the upper surface of the projecting portion 109 to present a finger 110 connected to the user's hand 108 while walking. The finger presentation unit 107 has a transparent flat plate made of acrylic, glass, or the like. The finger presentation unit 107 preferably has a size that covers from the index finger to the little finger of the user. That is, the length of the finger presentation unit 107 in the X direction, which is the direction in which the user walks, is longer than the width from the index finger to the little finger, and the length in the Y direction, which is the direction orthogonal to the direction of travel, is longer than the length of the middle finger. preferably longer. The projecting portion 109 may be inclined with respect to the upper surface of the housing 101 along the Y direction, which is a direction perpendicular to the X direction, which is the traveling direction of the user while walking. The inclination angle of the projecting portion 109 with respect to the upper surface of the housing 101 is assumed to be θ as shown in FIG.

The light source array 103 irradiates the finger 110 presented on the finger presentation unit 107 with light. The light source array 103 of this embodiment includes a plurality of point light sources 102 that irradiate near-infrared rays, and is a surface light source in which the point light sources 102 are arranged in a grid pattern. is erected in the vicinity of In other words, the light source array 103 is substantially perpendicular to the finger presentation unit 107 . The light emitted from the light source array 103 preferably enters the finger presentation unit 107 obliquely, for example, at an angle of 45 degrees, in order to prevent the point light source 102 from being directly reflected in the imaging unit 106, which will be described later. Incident. The light source array 103 may have a light shielding plate 104 so that the light from the light source array 103 is obliquely incident on the finger presentation unit 107 . The light shielding plate 104 is arranged parallel to the angle at which the light emitted from the point light source 102 is incident on the finger presentation unit 107 and protrudes from the light source array 103 to a position where the point light source 102 is not reflected in the photographing unit 106. . Alternatively, a directional light source may be used as the point light source 102 to make the light obliquely incident on the finger presentation unit 107 .

The imaging unit 106 is arranged in the housing 101 so that the optical axis of the imaging unit 106 is orthogonal to the finger presentation unit 107 , and the image of blood vessels included in the finger 110 irradiated with light is displayed by the finger presentation unit 107 . Shoot through a transparent flat plate. Since the near-infrared rays irradiated to the finger 110 are absorbed by the blood flowing through the blood vessels, the shadow of the blood vessels is imaged as a blood vessel pattern by the imaging unit 106 . Since the blood vessel pattern differs from person to person, personal authentication can be performed by registering the blood vessel pattern of each individual in advance and comparing the registered blood vessel pattern with the photographed blood vessel pattern. In order to improve the accuracy of personal authentication, it is preferable to use the blood vessel pattern from the index finger to the little finger for personal authentication. Desired.

Note that the position detection unit 105 may be arranged close to the imaging unit 106 . The position detection unit 105 is a device that acquires position information of the hand 108, and is, for example, a depth camera. The position information of the hand 108 acquired by the position detection unit 105 may be used to improve the accuracy of personal authentication.

By the way, in order to reduce the size of the blood vessel imaging apparatus, that is, to reduce the size of the housing 101, the length of the finger presentation unit 107 in the X direction, which is the traveling direction of the user while walking, should be as narrow as the width from the index finger to the little finger. are required to do so. If the width of the finger presentation unit 107 becomes narrower, it becomes difficult for the walking user to present the finger at an appropriate position with respect to the finger presentation unit 107, which may deteriorate the accuracy of personal authentication.

In this embodiment, since the finger presentation unit 107 protrudes from the housing 101, the user can easily grasp the position of the finger presentation unit 107 by touch or sight while walking. The finger can be presented in a suitable position. Further, since the finger presentation unit 107 is not embedded in the housing 101 and is configured as a flat surface, the user can smoothly present his or her finger while walking without catching a hand or finger on the finger presentation unit 107 . Furthermore, since the light source array 103 erected near the finger presenting portion 107 at the end of the projecting portion 109 serves as a fingertip stopper, the finger can be presented at an appropriate position with respect to the finger presenting portion 107 .

Further, when the finger presentation unit 107 is inclined along the Y direction with respect to the housing 101, the user can present a finger to the finger presentation unit 107 without bending the wrist much while walking. If the wrist is bent more than necessary, the blood flow in the fingers may become stagnant and the imaged blood vessel pattern may become unclear. According to research by the inventors, the inclination angle θ of the finger presentation unit 107 with respect to the housing 101 is preferably in the range of 5 degrees to 45 degrees, and more preferably in the range of 15 degrees to 30 degrees.

A blood vessel image capturing apparatus and a personal authentication system according to this embodiment will be described with reference to FIG. FIG. 2 is a schematic block diagram of the personal authentication system of this embodiment. The personal authentication system of this embodiment includes a blood vessel imaging device 200 and a gate device 230 .

The blood vessel imaging apparatus 200 includes the main body 100 and the computer 211 described with reference to FIG. The blood vessel pattern captured by the imaging unit 106 of the main body 100 is taken into the computer 211 via the interface 212 and compared with the blood vessel pattern registered in advance in the external storage device 218 . As a result of collation, if it is determined that the degree of similarity between the photographed blood vessel pattern and the registered blood vessel pattern is equal to or greater than a predetermined threshold value, personal authentication is performed as the user who is walking is a pre-registered user. . Processing related to personal authentication is performed using the CPU 217 and the memory 216 . That is, the computer 211 functions as an authentication unit that performs personal authentication. The result of personal authentication may be output from the input/output unit 215 in order to notify the user, for example, it may be displayed on a display, or a sound may be emitted from a speaker. Note that the processing related to personal authentication may be performed by an externally installed server.

The gate device 230 opens and closes according to the result of personal authentication by the blood vessel imaging device 200 . That is, in the blood vessel imaging apparatus 200, if the walking user is determined to be a pre-registered user, the gate is opened to allow passage, and if it is determined that the user is not a registered user, the gate remains closed. Become. The gate may be a bar that moves up and down, or a door that opens and closes from side to side like an automatic door. Further, instead of the gate device 230, another device such as an automatic teller machine of a bank may be used.

When the blood vessel imaging apparatus 200 includes the position detection unit 105 , various controls may be performed based on the position information of the hand 108 acquired by the position detection unit 105 . For example, the posture of the hand 108, the position of the fingers, the posture of the fingers, etc. may be acquired, and based on the acquired information, one of the plurality of point light sources 102 that illuminates the finger may be selected and turned on. By selectively turning on the point light source 102, it is possible to prevent the point light source 102 from being reflected in the photographing unit 106, and it is possible to photograph a clear blood vessel pattern, thereby improving the accuracy of personal authentication.

Further, when the light source array 103 has the light blocking plate 104, the irradiation range 222 of the near-infrared rays emitted from the light source array 103 is limited to the shaded area. As a result, although part of the point light source 102 is included in the imaging range 223 of the imaging unit 106 indicated by the shaded area, it is possible to prevent the point light source 102 from being reflected in the imaging unit 106 . By arranging the light source array 103 in the vicinity of the finger presentation unit 107, it becomes easy to secure the irradiation range of the light source array 103 in the Y direction even if the height of the light source array 103 is lowered.

An example of the flow of processing when personal authentication is performed by the blood vessel imaging apparatus 200 of this embodiment will be described with reference to FIG. Each step is executed in CPU 217 by a program stored in memory 216 .

At step 301 , it is detected that the hand 108 has been presented to the finger presentation unit 107 by the user. At step 302 , position information of the presented hand 108 is acquired by the position detection unit 105 . At step 303 , the hand 108 near the finger presentation unit 107 is detected from the position information acquired at step 302 . In step 302, even if the positional information of part of the hand 108 cannot be obtained from the position detection unit 105, the shape of the hand 108 is estimated from the obtained information, and the hand 108 is detected. In step 304 it is determined whether hand 108 was detected in step 303 . If the hand is not detected, the process returns to step 302, and if the hand is detected, the process proceeds to step 305. In step 305, using the position information of the hand 108 acquired from the position detection unit 105, information such as the position of the fingertips of each finger, the direction of the fingers, and the inclination of the fingers is calculated. In step 305, even if the positional information of part of the hand 108 cannot be acquired from the position detection unit 105, information such as the position of the fingertip, the orientation of the finger, and the inclination of the finger is estimated from the acquired information. In step 306, among the plurality of point light sources 102 arranged in the light source array 103, those that illuminate the position of the finger are selectively turned on. A light shielding plate 104 is installed in the light source array 103 to partially limit the overlap of the irradiation range of each point light source 102. Therefore, each point light source 102 is irradiated so that the brightness of the finger blood vessel image is uniform. The amount of light may be controlled. At step 307 , the finger blood vessel image captured by the imaging unit 106 is captured by the computer 211 . At step 308, multiple finger regions are detected from the finger blood vessel image. In step 309, correction of finger orientation and correction of distortion due to posture change are performed. In step 310, finger vessel feature information is extracted from each finger vessel image. In step 311, the finger blood vessel characteristic information extracted in step 310 and the finger blood vessel characteristic information pre-registered in the external storage device 218 are collated, and a collation score is calculated. At step 312, it is determined whether or not the collation score calculated at step 311 exceeds the threshold TH1. If the matching score exceeds the threshold TH1, the process proceeds to step 313, and after successful authentication processing such as opening the gate of the gate device 230, the process proceeds to step 315. If the collation score calculated in step 311 does not exceed the threshold TH1, the process proceeds to step 314 for post-authentication failure processing, such as keeping the gate of the gate device 230 closed, and then proceeds to step 315 . At step 315, it is determined whether or not to continue the authentication process. If the authentication process is to be continued, the process returns to step 302. If the authentication process is not to be continued, the process proceeds to step 316 and ends.

In the first embodiment, the main body 100 of the blood vessel imaging apparatus in which the light source array 103, which is a surface light source, is erected at the end of the projecting portion 109 and near the finger presentation portion 107 has been described. In the present embodiment, the main body 100 of the blood vessel imaging apparatus including the light source array 403 that is bent in order to reduce the size of the main body 100, particularly in the Z direction, which is the vertical direction, will be described. Since the overall configuration of the present embodiment is substantially the same as that of the first embodiment, the description will be simplified, and the structure of the light source array 403, which is different from the first embodiment, will be particularly described.

A main body 100 of the blood vessel imaging apparatus of this embodiment will be described with reference to FIG. FIG. 4 is a perspective view similar to FIG. 1, where the X direction is the direction in which the user walks, the Z direction is the vertical direction, and the Y direction is the direction orthogonal to the X and Z directions. Main body 100 includes housing 101 , light source array 403 , and imaging unit 106 . The light source array 403 will be described below.

The light source array 403 irradiates the finger 110 presented on the finger presentation unit 107 with light. The light source array 403 of this embodiment includes a plurality of point light sources 402 that irradiate near-infrared rays. It is erected near the finger presentation unit 107 . That is, the light source array 403 has a folded structure. In addition, the light source array 403 is obtained by adding a light source array 403b parallel to and facing the finger presentation unit 107 to the light source array 403a erected at the end of the projecting portion 109 as in the first embodiment. can also

In order to avoid direct reflection of the point light source 402 on the imaging unit 106, it is preferable that the light emitted from the light source array 403 is obliquely incident on the finger presentation unit 107, as in the first embodiment. The light source array 403 may have a light blocking plate 404 in order to obliquely enter the light from the light source array 403 into the finger presentation unit 107 . The light shielding plate 404 is arranged parallel to the angle at which the light emitted from the point light source 402 is incident on the finger presentation unit 107 and protrudes from the light source array 403 to a position where the point light source 402 is not reflected in the photographing unit 106 . .

Since the light source array 403 has the structure shown in FIG. 4, the height of the light source array 403 can be reduced even if the irradiation range in the Y direction is the same. Further, as in the first embodiment, since the finger presentation unit 107 protrudes with respect to the housing 101, the user while walking can easily grasp the position of the finger presentation unit 107 by touch or sight. A finger can be presented at an appropriate position with respect to 107 .

The position at which the light source array 403 is bent is appropriately selected according to the balance between the ease of visually grasping the position of the finger presentation unit 107 and the height of the light source array 403 . Note that when the position of the finger presentation unit 107 is grasped only by the sense of touch, the light source array 403 may be provided only in a portion parallel to and facing the finger presentation unit 107 .

In the first embodiment, the configuration in which the finger presentation unit 107 is provided on the projecting portion 109 projecting from the top surface of the housing 101 has been described so that the position of the finger presentation unit 107 can be easily grasped visually. In this embodiment, in order to make it easier to visually grasp the position of the finger presentation unit 107, a configuration for displaying a guide for the finger presentation position will be described. Since the configuration of the present embodiment is substantially the same as that of the second embodiment, the description will be simplified, and the points different from the second embodiment will be particularly described.

A main body 100 of the blood vessel imaging apparatus of this embodiment will be described with reference to FIG. FIG. 5 is a perspective view similar to FIG. 4, in which the X direction is the direction in which the user walks, the Z direction is the vertical direction, and the Y direction is the direction orthogonal to the X and Z directions. The main body 100 includes a housing 101, a light source array 403, and an imaging unit 106, and further includes a guide display unit 510, as in the second embodiment.

The guide display unit 510 is arranged around the light source array 403b and emits guide light 511, which is concave visible light, along the outer circumference of the finger presentation unit 107. FIG. By irradiating the outer periphery of the finger presentation unit 107 with the concave guide light 511 , it is possible to prompt the user to present the finger inside the guide light 511 .

Also, the color and lighting time of the guide light 511 may be changed according to the position information of the hand 108 acquired by the position detection unit 105 . For example, by changing the color of the guide light 511 to blue if the distance from the finger presentation unit 107 to the hand 108 is too far, red if too close, and green if the distance is within an appropriate range, the hand 108 The user can be informed whether the height of is appropriate or not. Further, when any of the index finger, the middle finger, the ring finger, and the little finger is not included in the finger presentation unit 107, the guide light 511 is blinked, and the more fingers are not included, the shorter the blinking cycle. The user can be informed if the location of 108 is appropriate.

Also, an image 513 of the finger presentation unit 107 and an image 514 of the hand appropriately presented to the finger presentation unit 107 may be displayed on a side surface 512 of the projection 109 facing in the Y direction. A palm image 515 may be displayed on the upper surface of the projecting portion 109 and other than the finger presentation portion 107 . It is desirable that the image diagram 515 clearly shows the position of the thumb. By displaying such images 513 , 514 , and 515 , the user can be notified of the position of the hand appropriately presented to the finger presentation unit 107 .

In the first embodiment, the main body 100 of the blood vessel imaging apparatus in which the light source array 103, which is a surface light source, is erected at the end of the projecting portion 109 and near the finger presentation portion 107 has been described. In this embodiment, in order to reduce the height of the main body 100, a configuration will be described in which a surface light source is horizontally arranged at the end of the protruding portion 609 and in the vicinity of the finger presenting portion 607. FIG. Since the overall configuration of the present embodiment is substantially the same as that of the first embodiment, the description will be simplified, and the projecting portion 609 and the light source array 603, which are different from the first embodiment, will be particularly described.

A body 100 of the blood vessel imaging apparatus of this embodiment will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is a perspective view similar to FIG. 1, in which the X direction is the direction in which the user walks, the Z direction is the vertical direction, and the Y direction is the direction orthogonal to the X and Z directions. FIG. 7 is a side view of the main body 100 of the blood vessel imaging apparatus of this embodiment. Main body 100 includes housing 101 , light source array 603 , and imaging unit 106 . The housing 101 and the light source array 603 will be described below.

The housing 101 has a protrusion 609, which protrudes from the upper surface of the housing 101 and is inclined with respect to the upper surface of the housing 101 along the Y direction, which is a direction orthogonal to the traveling direction of the user while walking. It has an inclined surface. The inclined surface of the projecting portion 609 is provided with a finger presenting portion 607 to which the finger of the user's hand 608 during walking is presented. The finger presentation unit 607 has a transparent flat plate as in the first embodiment. The finger presentation unit 607 has a shape large enough to cover the user's index finger, middle finger, ring finger, and little finger, and is, for example, a rectangle that covers the width from the index finger to the little finger and the length of the middle finger. In addition, the length of the inclined surface of the projecting portion 609 is made substantially the same as that of the finger presenting portion 607 so that the palm of the user's hand 608 can be placed on the palm contact surface 609a, which is the side surface of the projecting portion 609 facing the Y direction. . The angle formed by the palm contact surface 609a and the finger presentation portion 607 is approximately the same as the angle formed by the palm and the fingers when the hand 608 is relaxed.

A light source array 603 irradiates a finger of a hand 608 presented on a finger presentation unit 607 with light. The light source array 603 of this embodiment includes a plurality of point light sources 602 that irradiate near-infrared rays, and is a surface light source in which the point light sources 602 are arranged in a grid pattern. is placed horizontally in the vicinity of That is, the angle formed by the light source array 603 and the finger presentation unit 607 is an obtuse angle, and the light source array 603 is arranged outside the imaging range 723 of the imaging unit 106 indicated by the shaded area. A near-infrared irradiation range 722 indicated by hatching is the dorsal side of the fingers of the hand 608 . Note that the light shielding plate 104 may be provided in the light source array 603 as necessary.

According to this embodiment, the light source array 603 is arranged at a position lower than the projecting portion 609, so that the height of the main body 100 can be made lower than in the first to third embodiments. In addition, since the angle formed by the light source array 603 and the finger presentation unit 607 is an obtuse angle, and the point light source 602 of the light source array 603 is arranged outside the imaging range of the imaging unit 106, the point light source 602 is reflected in the imaging unit 106. can be avoided. Further, since the finger presentation part 607 is provided on the inclined surface of the protruding part 609 , the user while walking can easily grasp the position of the finger presentation part 607 by touch or sight. can be presented. Furthermore, the inclined surface of the protruding portion 609 and the length of the finger presentation portion 607 are substantially the same, and the angle formed by the palm contact surface 609a and the finger presentation portion 607 is approximately the same as the angle formed by the palm and the fingers. 608 can be applied to the projecting portion 609 without stiffening. If the user does not stiffen the hand 608, the blood vessel image of the finger is captured without stagnation of the blood flow in the finger, so that a clear blood vessel pattern can be acquired.

The protrusions 609 that keep the user from stiffening the hand 608 are not limited to the shapes shown in FIGS. 8 and 9 show modifications of the projection 609. FIG. 8 and 9 are side views of the main body 100 of the blood vessel imaging apparatus, similar to FIG. In FIG. 7, the protrusion 609 has a triangular shape in the plane perpendicular to the X direction, whereas FIG. 8 has a trapezoidal shape, and FIG. 8 and 9, the user can place the hand 608 on the protruding portion 609 without stiffening, so that a clear blood vessel pattern can be acquired, and the accuracy of personal authentication can be improved. Note that the palm contact surface 609a is not limited to a flat surface and may be a curved surface.

Also, the protrusion 609 that prevents the user from stiffening the hand 608 can be applied to other embodiments. FIG. 10 shows a modification of the second embodiment. In FIG. 10, the protrusion 109 has a trapezoidal shape in a plane perpendicular to the X direction, and a palm contact surface 109a is provided on the upper base of the trapezoidal shape. In FIG. 10 as well, the user can place the hand 608 on the projecting portion 609 without stiffening the hand 608, so that a clear blood vessel pattern can be obtained.

Although the four embodiments have been described above, the blood vessel imaging apparatus of the present invention is not limited to the above embodiments, and can be embodied by modifying the constituent elements without departing from the scope of the invention. Also, a plurality of constituent elements disclosed in the above embodiments may be appropriately combined. Furthermore, some components may be deleted from all the components shown in the above embodiments.

100 main body 101 housing 102 point light source 103 light source array 104 light shielding plate 105 position detection unit 106 imaging unit 107 finger presentation unit 108 user's hand 109 projecting unit 110 finger 200 blood vessel imaging device 211 computer 212 interface 215 input/output unit 216 memory 217 CPU
218 External storage device 222 Near-infrared irradiation range 223 Shooting range 230 Gate device 402 Point light source 403 Light source array 404 Light shielding plate 510 Guide display unit 511 Guide light 512 Side surface of projection facing Y direction 513 Image of finger presentation unit 514 Hand Image 515 Palm image 602 Point light source 603 Light source array 607 Finger presentation unit 608 User's hand 609 Projection 722 Near-infrared irradiation range 723 Shooting range

Claims (4)

a finger presentation unit having a flat surface on which a finger is applied;
a light source that irradiates the upper surface of the finger applied to the finger presentation unit with light;
an imaging unit that captures, through the plane, a transmission image of blood vessels included in the finger irradiated with light;
a housing having the finger presentation unit;
A blood vessel imaging apparatus comprising an authentication unit that determines that personal authentication is successful when a degree of similarity between a blood vessel pattern in a captured image of blood vessels and a blood vessel pattern in a pre- registered image is equal to or greater than a predetermined threshold,
the finger presentation unit protrudes from the upper surface of the housing,
The blood vessel image capturing apparatus, wherein the plane of the finger presentation unit is inclined with respect to the upper surface of the housing, and the tip side of the finger to be applied is lower than the hand side. The blood vessel imaging apparatus according to claim 1,
A blood vessel imaging apparatus, wherein the inclination angle of the plane with respect to the upper surface of the housing is in the range of 5 degrees to 45 degrees. The blood vessel imaging apparatus according to claim 2,
The blood vessel image capturing apparatus, wherein the inclination angle of the plane with respect to the upper surface of the housing is in the range of 15 degrees to 30 degrees. the blood vessel imaging apparatus according to any one of claims 1 to 3;
A gate device that opens and closes according to the result of personal authentication in the blood vessel imaging device,
A personal authentication system, wherein the gate device is opened when the blood vessel imaging device determines that the walking user is a pre-registered user.

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