JP7507490B2 - Blood flow authentication device - Google Patents

Description

The present invention relates to a terminal device for a blood flow authentication device and a blood flow authentication device that performs personal authentication using blood vessel patterns obtained by imaging light that has passed through a human finger.

Fingerprint authentication has traditionally been a well-known personal authentication technology, but due to the problem that fingerprints of other people can be forged, blood flow authentication based on blood vessel patterns has been developed.

In this blood flow authentication, the blood vessel patterns are each independent and no two are the same. In addition, since blood vessels are difficult to determine from their appearance, they are difficult to forge and can be authenticated with high accuracy.

For example, Patent Document 1 discloses a terminal device for a blood flow authentication device that includes a base on which a finger is placed, a light source that is located at one end of the base and installed in front of the tip of the finger placed on the base, and irradiates light from the front of the fingertip toward the back of the finger from the fingertip to the base, and an imaging device that is installed on the base directly below the finger on the pad side of the finger placed on the base and captures an image of the blood vessels of the finger obtained by transmitting the light emitted from the light source through the finger.

JP 2014-99149 A

When the terminal device for the blood flow authentication device disclosed in Patent Document 1 is used in a residential building or office where multiple users enter and exit, the user's fingers come into contact with the device inside, and if pathogens such as viruses or bacteria are present, they may be transferred to the user's fingers and cause an infection.

The present invention aims to solve these problems by providing a hygienic terminal device for a blood flow authentication device that does not spread pathogens such as viruses and bacteria to users, even when the device is shared in a residential building or office where multiple users enter and exit.

[1] The present invention relates to a housing (20) having an insertion hole (21) for inserting a finger (F), a near-infrared light source (30) for irradiating near-infrared light into the inside of the housing (20) for the back side of the finger (F) that is inserted by contacting the back side (F1) of the finger (F) with the inner wall surface of the insertion hole (21) without contacting the palm side of the finger (F) with the inner wall surface of the insertion hole (21), an ultraviolet light source (31) for irradiating ultraviolet light into the insertion hole (21), an imaging unit (40) for imaging the near-infrared light irradiated from the near-infrared light source (30) that has passed through the finger (F) at a position facing the near-infrared light source (30), and an imaging unit (40) that is installed at a position corresponding to the tip of the finger (F) that is in contact with the inner wall surface, and that positions the fingertip by contacting the fingertip and also adjusts the position of the fingertip. The blood flow authentication device includes a terminal device (10) for the blood flow authentication device, the terminal device (10) being provided with a fingertip detection sensor (50) for detecting contact, a fingertip detection sensor (60) that is provided at a position corresponding to the fingertip (F5) of the finger (F) that is in contact with the inner wall surface and detects contact of the fingertip (F5), and a lid (24) that covers the insertion hole (21) in an openable and closable manner, and the ultraviolet light source (10) is illuminated when the lid (24) is open.
The blood flow authentication device is characterized in that the ultraviolet light source (31) is turned off when the cover portion (24) is closed, and the ultraviolet light source (31) is turned on when the cover portion (24) is closed.

[2] The blood flow authentication device according to [1] above, characterized in that the terminal device (10) for the blood flow authentication device receives ultraviolet light from the ultraviolet light source (31) and includes a light reflecting member (80) installed in the insertion hole (21) at a position capable of reflecting the ultraviolet light.

[3] The blood flow authentication device according to [1] or [2], characterized in that in the terminal device (10) for the blood flow authentication device, the ultraviolet light source (31) is installed on at least one of the back side (F1) or palm side (F2) of the finger (F) to be inserted.

The terminal device for the blood flow authentication device of the present invention can maintain a hygienic condition that prevents the spread of pathogens such as viruses and bacteria among users, even when the device is shared in a residential building or office where multiple users enter and exit.

3 is a vertical cross-sectional view of the terminal device for the blood flow authentication device according to the first embodiment of the present invention when in use. FIG. 1 is a longitudinal sectional view of a terminal device for a blood flow authentication device in a first embodiment of the present invention when not in use (sterilized). FIG. 2 is a cross-sectional view taken along line AA when the terminal device for the blood flow authentication device in the first embodiment of the present invention is in use. FIG. 5 is a cross-sectional view taken along the line BB when the terminal device for the blood flow authentication device in the first embodiment of the present invention is in use. FIG. 10 is a flowchart showing a blood flow authentication process in a blood flow authentication device using a terminal device for the blood flow authentication device in the first embodiment of the present invention. FIG. FIG. 11 is a flowchart showing a sterilization process in a blood flow authentication device using a terminal device for the blood flow authentication device in the first embodiment of the present invention. 13 is a vertical cross-sectional view of a terminal device for a blood flow authentication device according to a second embodiment of the present invention when in use. FIG. 13 is a longitudinal sectional view of a terminal device for a blood flow authentication device in a second embodiment of the present invention when not in use (sterilized). FIG.

The terminal device for the blood flow authentication device in the embodiment of the present invention will be described below with reference to the drawings. In the blood authentication device using the terminal device for the blood flow authentication device, the back of the finger of the person to be authenticated is placed on the upper side and the palm side is placed on the lower side, and inserted into the insertion hole of the housing, and the blood vessel pattern is imaged with the back of the finger abutting against the upper side of the inner wall surface of the insertion hole, and authentication is performed.

The terminal device 10 for the blood flow authentication device according to the present invention is connected to an authentication control device (not shown) that performs authentication of the vascular pattern of the person to be authenticated, controls the near-infrared light source, ultraviolet light source, finger detection sensor, imaging device, etc., stores registered or imaged vascular patterns, performs matching processing, etc., to constitute the blood flow authentication device. As shown in Figures 1 to 4 of the first embodiment, or Figures 7 and 8 of the second embodiment, the terminal device for the blood flow authentication device mainly comprises a housing 20 into which the finger F of the person to be authenticated is inserted to image the blood pattern, an infrared light source 30, an ultraviolet light source 31, an imaging device 40, etc.

The housing 20 is provided with an insertion hole 21 into which the finger F of the person to be authenticated, whose blood pattern is to be imaged, is inserted. As shown in Figs. 1 to 4, the housing 20 contains LEDs serving as near-infrared light sources 30 and ultraviolet light sources 31 arranged along the axial direction of the insertion hole 21 on the upper side of the insertion hole 21, which is the back side F1 of the finger F to be inserted. Alternatively, as shown in Figs. 7 and 8, the housing 20 contains a plurality of LEDs serving as near-infrared light sources 30 arranged along the axial direction of the insertion hole 21 on the upper side of the insertion hole 21, which is the back side F1 of the finger F to be inserted, and an LED serving as ultraviolet light source 31 is arranged on the lower side of the insertion hole 21, which is the palm side F2 of the finger F to be inserted. Meanwhile, an imaging device 40 is arranged on the lower side of the insertion hole 21 in the housing 20, facing the near-infrared light source 30.

In addition, a transparent plate 22 made of synthetic resin such as acrylic that can transmit near-infrared light irradiated from the near-infrared light source 30 is interposed on the inner wall surface located above the insertion hole 21, preventing the finger F of the person to be authenticated from directly contacting the near-infrared light source 30 and the ultraviolet light source 31. Furthermore, a lid 24 that can be opened and closed freely is attached to the outside of the housing 20, and when the finger F of the person to be authenticated is not inserted into the insertion hole 21, the lid 24 covers the insertion hole 21, and when in use, the lid 24 is moved by rotating or sliding to reveal the insertion hole 21. As described later, by having the lid 24, the timing of turning on and off the ultraviolet light source 31 is measured by opening and closing it, and ultraviolet light is prevented from leaking out from inside the housing 20 when the ultraviolet light source 31 is turned on.

Furthermore, as shown in Figures 2 and 8, a pair of left and right support parts 23 are provided on the inner wall surface located on the upper side of the housing 20, protruding downward with the near-infrared light source 30 arranged along the axial direction of the insertion hole 21 at its center.

The support section 23 supports both sides of the finger F of the person to be authenticated for blood flow authentication. Specifically, the support section 23 supports both sides of the finger F when the finger F of the person to be authenticated is positioned directly under the near-infrared light source 30 and the ultraviolet light source 31 and the back side F1 of the finger F of the person to be authenticated is in contact with the inner wall surface of the insertion hole 21 in the housing 20.

The support portion 23 is composed of a pair of left and right support portions 23, which are installed to protrude along the inner wall surface of the insertion hole 21 with a predetermined gap between them. That is, depending on the shape of the insertion hole 21, the support portion 23 may be linear or curved in the axial direction. In addition, it is desirable that the support portion 23 is formed to a length corresponding to approximately the entire length of the finger F in the longitudinal direction, and that the portion that contacts the finger F is formed in an approximately arc shape so that it fits along the side of the finger. The support portion 23 thus formed is made of a material that blocks visible light and near-infrared light. This can reduce the leakage of light from the near-infrared light source 30 to the imaging device 40, and can suppress the occurrence of halation during imaging.

Although the support section 23 supports one finger F to be authenticated, similar support sections can also be provided on one or both sides of the support section 23. In this way, by providing multiple support sections, it is possible to support adjacent fingers other than the finger F to be authenticated. This makes it possible to prevent so-called rolling, in which the finger F supported by the support section rotates along the axis of the finger F. By preventing rolling, it is possible to stabilize the captured image and capture a clearer vascular pattern.

A fingertip detection sensor 50 is provided at a position corresponding to the tip of the finger F inserted into the insertion hole 21, and a finger base detection sensor 60 is provided at a position corresponding to the base F5 of the finger F. A filter 70 that does not transmit any light other than near-infrared light is provided above the imaging device 40 in the housing 20.

The near-infrared light source 30 is made of a member that emits near-infrared light, such as an LED equipped with a condensing lens at the tip. The near-infrared light having a wavelength in the range of 700 to 2500 nm that is irradiated from the near-infrared light source 30 passes through the finger F of the person to be authenticated and makes the vascular pattern of the finger F of the person to be authenticated stand out. The near-infrared light source 30 is disposed above the insertion hole 21, which is the back side F1 of the finger F to be inserted. In the first and second embodiments, the near-infrared light source 30 is arranged with four LEDs arranged along the axial direction of the insertion hole 21 in the housing 20, i.e., along the longitudinal direction of the finger F, but this is not limited to this. For example, the number is not limited to four, and it can also be an integrated elongated light-emitting element. The amount of light irradiated from the near-infrared light source 30 and the irradiation time can be controlled by a light amount adjustment means.

The ultraviolet light source 31 is made of a member that emits ultraviolet light, such as an LED equipped with a condensing lens at the tip. The ultraviolet light irradiated from the ultraviolet light source kills or inactivates pathogens such as bacteria and viruses attached to the fingertip detection sensor 50 and the light-transmitting plate 22 inside the housing 20. The wavelength of the ultraviolet light irradiated from the ultraviolet light source 31 is preferably 260 to 285 nm. When the wavelength of the ultraviolet light is in this range, viruses such as influenza virus, coronavirus, norovirus, and SARS can be inactivated within about 60 seconds, and irradiation can be performed quickly without time required for preparation for irradiation. The ultraviolet light source 31 is disposed above the insertion hole 21, which is the back side F1 of the finger F to be inserted, or below the insertion hole 21, which is the palm side F2 of the finger F to be inserted. In the first embodiment, the ultraviolet light source 31 is disposed closer to the fingertip F3 of the finger F than the near-infrared light source 30, and more specifically, one LED is disposed closer to the fingertip F3 than the near-infrared light source 30 disposed closest to the fingertip F3 among the multiple near-infrared light sources 30. In another embodiment, the ultraviolet light source 31 is not limited to one, and may be disposed in the middle of the multiple infrared light sources 30. In the second embodiment, the ultraviolet light source 31 is disposed on the finger base F5 side of the inserted finger F, and more specifically, one LED is disposed near the opening of the insertion hole 21. In another embodiment, the ultraviolet light source 31 is not limited to one, and may be disposed on the fingertip F3 side of the finger F. The amount of light emitted from the ultraviolet light source 31 and the irradiation time can be controlled by a light amount adjustment means.

The imaging device 40 captures an image of blood vessels obtained by light irradiated from the near-infrared light source 30 passing through the finger F and the filter 70. The imaging device 40 is equipped with an imaging element, an optical system including a lens, and an imaging drive circuit, and is installed on the lower side of the insertion hole 21, i.e., further below the filter 70, in a position facing the near-infrared light source 30 with the finger F of the person to be authenticated between them. Specifically, the optical axis of the imaging device 40 is installed at a position below the approximate center in the longitudinal direction where the near-infrared light source 30 is installed. In addition, the imaging device 40 is focused slightly from the epidermis on the palm side of the person to be authenticated to the inside of the finger so as not to recognize fingerprints, etc.

The fingertip detection sensor 50 detects the fingertip F3 of the person to be authenticated that is inserted into the insertion hole 21 of the housing 20. The fingertip detection sensor 50 is installed at a position corresponding to the fingertip F3 of the finger F supported by the support portion 23, and is formed, for example, from a rectangular metal plate. When the fingertip F3 of the person to be authenticated comes into contact with the fingertip detection sensor 50, the fingertip F3 is positioned in the axial direction in the insertion hole 21 and the contact is detected electrically. Specifically, the surface of the fingertip detection sensor 50 is made of a conductive material such as aluminum, and the contact is detected by a change in capacitance.

Fingertip detection sensor 50 is installed at a height where fingertip F3 of the person to be authenticated can come into contact, but where nail F4 of the person to be authenticated cannot come into contact. For example, it may be installed at the tip of a roughly L-shaped member that protrudes downward from above the inner wall surface of insertion hole 21 in housing 20, or it may be installed at the tip of a member that faces downward from above the inner wall surface of insertion hole 21 and has a hole through which nail F4 of the person to be authenticated can be inserted.

The finger detection sensor 60 detects the finger F5 of the person to be authenticated that is inserted into the insertion hole 21 of the housing 20. The finger detection sensor 60 is installed at a position corresponding to the finger F5 of the finger F supported by the support portion 23, and is formed, for example, from a rectangular metal plate. When the finger F5 of the person to be authenticated comes into contact with the finger detection sensor 60, the contact is detected electrically. Specifically, the surface of the finger detection sensor 60 is made of a conductive material such as aluminum, and the contact is detected by a change in capacitance.

Furthermore, the finger detection sensor 60 is installed so as to contact the back side F1 of the finger base F5 when the finger F of the person to be authenticated is located directly below the near-infrared light source 30 and the back side F1 of the finger F of the person to be authenticated is in contact with the inner wall surface of the insertion hole 21 in the housing 20. It is desirable that the lower end surface of the finger detection sensor 60 with which the finger base F5 comes into contact is formed in a substantially arc shape to match the shape of the finger base F5. This ensures that the finger base F5 of the person to be authenticated can be reliably supported and the finger F can be reliably detected.

Then, by both the fingertip detection sensor 50 and the finger base detection sensor 60 detecting the finger F of the person to be authenticated, it can be determined that it is a living body and not a pseudo finger that resembles a finger. In this way, it is preferable to control the start of the detected blood flow authentication operation after both the fingertip detection sensor 50 and the finger base detection sensor 60 have confirmed that it is the finger F of the person to be authenticated.

Furthermore, the light reflecting member 80 is a member that receives ultraviolet light from the ultraviolet light source 31 and is installed in a position in the insertion hole 21 that can reflect the ultraviolet light from the ultraviolet light source 31. In the first embodiment, the light reflecting member 80 is installed facing the ultraviolet light source 31 across the fingertip detection sensor 50, and in the second embodiment, it is arranged on the fingertip F3 side of the near-infrared light source 30 and reflects light such as ultraviolet light. Specifically, a mirror or the like is preferable as the light reflecting member 80. The light reflecting member 80 reflects and diffuses the ultraviolet light irradiated from the ultraviolet light source 31, causing the ultraviolet light to spread widely inside the housing 20, particularly in the insertion hole 21, and can kill or inactivate bacteria and viruses attached to the translucent plate 22, the support part 23, the fingertip detection sensor 50, and the finger base detection sensor 60 that are in contact with the back side F1 of the finger F. In addition, in the first and second embodiments, the light reflecting member 80 is flat, but in other embodiments, it may have projections and recesses as long as it can reflect and diffuse the ultraviolet light from the ultraviolet light source 31 so that the ultraviolet light irradiated from the ultraviolet light source 31 reaches the insertion hole 21.

In addition, regardless of the presence or absence of the light reflecting member 80 described above, it is preferable to make the surface of at least the fingertip detection sensor 50 of the fingertip detection sensor 50 and the finger base detection sensor 60 described above smooth like a mirror. By making the surface smooth like a mirror in this way, even if the housing is large enough that it is difficult to provide space for installing the light reflecting member 80, the ultraviolet light irradiated from the ultraviolet light source 31 can be reflected and diffused at least by the fingertip detection sensor 50, and the ultraviolet light can be widely distributed inside the housing 20, thereby killing or inactivating attached bacteria and viruses. Of course, the surface of the fingertip detection sensor 50, etc. may be a curved surface with irregularities as long as it is smooth enough to reflect and diffuse the ultraviolet light.

Furthermore, in order to enhance the effect of killing attached bacteria and inactivating viruses, it is also preferable to provide a photocatalytic layer by applying a metal oxide exhibiting photocatalytic activity, such as titanium oxide having an anatase crystal structure, to the inside of the housing 20. Here, the inside of the housing 20 refers to the inner wall surface of the insertion hole 21 into which the finger F is inserted, more specifically, the lower surface of the transparent plate 22 and the surface of the support part 23 against which the finger F abuts, and further, the palm side 2 of the finger F, such as the upper surface of the filter 70 and the side surface of the insertion hole 21. Note that it is preferable not to provide a photocatalytic layer on the surfaces of the fingertip detection sensor 50 and the finger base detection sensor 60, since this reduces electrical conductivity.

The terminal device 10 for the blood flow authentication device is configured in this way, and the blood flow authentication device configured by connecting an authentication control device (not shown) to this will be described with reference to Figures 5 and 6. The authentication control device authenticates the blood vessel pattern of the person to be authenticated, turns on the near-infrared light source 30 and the ultraviolet light source 31, controls the finger detection sensor and the image capture device 40, stores the registered or imaged blood vessel patterns, performs matching processing, etc.

As shown in FIG. 5, the process related to blood flow authentication will be described below. First, in S10, the person to be authenticated opens the lid 24, which is detected by a detector such as a switch that comes into contact with the lid 24 and operates in conjunction with it, or a non-contact sensor that detects a change in distance from the lid 24. This action triggers the start of the blood flow authentication process. Then, the person to be authenticated moves the finger F along the support portion 23, bringing the back side F1 into contact with the translucent plate 22.

In S11, it is determined whether or not a finger F has been detected by both the fingertip detection sensor 50 and the finger base detection sensor 60 due to the movement of the person to be authenticated. This determination is made by the authentication control device connected to the terminal device 10 for the blood flow authentication device. If the determination result is positive, the process proceeds to S12 and the authentication operation is started as the person is alive, and if the determination result is negative, the authentication operation is not started as the person is not alive, and a notification of this is given by outputting a voice message or sounding a buzzer or the like, and the blood flow authentication process is terminated.

In S12, the authentication control device causes the IR-LED, which is the near-infrared light source 30, to emit light and irradiate the back side F1 of the finger F of the person to be authenticated. Then, for example, the process proceeds to S13 when the illuminance of the IR-LED has stabilized due to a predetermined setting in the light amount adjustment means.

In S13, the authentication control device operates the imaging device 40 to capture an image of the finger F. The captured image is supplied to the authentication control device. In this imaging, multiple images may be captured for each appropriate illuminance, and then a predetermined area may be cut out and stitched together to create a single image of the finger F, or only one image may be captured from a predetermined illuminance. Image processing is not limited to this, and an appropriate combination of processes may also be performed.

In S14, the authentication control device determines whether the captured image matches the registered image of the person to be authenticated. In this embodiment, blood flow authentication is performed in the same manner as in the conventional method, by extracting a pattern of the blood flow shape, performing image processing, and using feature point extraction and feature point matching, but other matching processes can also be used.

If the blood flow authentication result shows that the captured image matches the registered image or the match rate is equal to or greater than a predetermined rate, the authentication control device judges the person to be authenticated to be a suitable person, sends a suitable person signal, and ends the blood flow authentication process. The suitable person signal is used as a trigger to operate, for example, an unlocking process to unlock a door linked to the blood flow authentication device. On the other hand, if the person to be authenticated is judged to be an unsuitable person, a voice output to that effect or a buzzer sound is sounded to notify the person that they are unsuitable, and the blood flow authentication process ends.

The sterilization process will now be described below, as shown in FIG. 6. First, in S20, the closure of the lid 24 is detected by a detector such as a switch that comes into contact with the lid 24 and operates in conjunction with the lid 24, or a non-contact sensor that detects a change in the distance from the lid 24. This action triggers the start of the sterilization process, which then proceeds to S21.

In S21, the ultraviolet light source 31 is turned on. The emitted ultraviolet light sterilizes the space inside the housing 20 where the finger F of the person to be authenticated is inserted.

In S22, the lighting time of the ultraviolet light source 31 is determined. It is determined whether a preset time, for example 5 seconds, 30 seconds, or 60 seconds, has elapsed since the ultraviolet light source 31 was turned on and ultraviolet light was started to be emitted. If the preset time has elapsed, the process proceeds to S24, and if not, the process proceeds to S23. It is preferable that the preset irradiation time of the ultraviolet light source 31 be changeable so that it is more effective against prevalent bacteria, viruses, and the like.

In S23, if the ultraviolet light source 31 has not been turned on for a predetermined time, it is determined whether the lid 24 has been opened. If it is detected that the lid 24 has been opened, the flow proceeds to S24 so as not to irradiate the finger F with ultraviolet light, since there is a possibility that the finger F of the person to be authenticated may be inserted. Furthermore, if the lid 24 has not been opened, the ultraviolet light source 31 continues to be turned on until the predetermined time has passed. Note that in this embodiment, for ease of understanding, a flow is used in which it is appropriately determined that the lid 24 has been opened, but this is not limited to this, and it is of course possible to forcibly end the illumination of the ultraviolet light source 31 as an interrupt program when it is detected that the lid 24 has been opened.

In S24, when the ultraviolet light source 31 has been on for a predetermined time, or when the ultraviolet light source 31 has not been on for the predetermined time but it is detected that the lid portion 24 has been opened, the ultraviolet light source 31 is turned off, and the sterilization process is terminated.

The above-mentioned process for blood flow authentication is for the first embodiment shown in Figures 1 to 4, but can also be used in the second embodiment shown in Figures 7 and 8.

According to the terminal device 10 for blood flow authentication device and blood flow authentication device of the present invention described above, the finger F is inserted by contacting the back side F1 of the finger F with the upper side of the inner wall surface of the insertion hole 21 provided in the housing 20 without contacting the palm side F2 of the finger F with the lower side of the inner wall surface, and the light from the near-infrared light source 30 is irradiated from the inside and above of the housing 20 onto the back side F1 of the finger F to capture an image of the blood vessel pattern. As a result, even if the person to be authenticated is not familiar with using the blood flow authentication device, the blood vessels distributed on the palm side F2 of the finger F are not compressed. This prevents a decrease in the recognition rate due to a decrease in the imaging effect, and allows a clearer image to be obtained than before.

Furthermore, according to the terminal device 10 for the blood flow authentication device and the blood flow authentication device of the present invention described above, when the finger F of the person to be authenticated is pulled out of the housing 20, the light of the ultraviolet light source 31 is irradiated to kill or inactivate bacteria and viruses attached to the inside of the housing 20, i.e., the underside of the light-transmitting plate 22 that abuts against the back side F1 of the finger F of the person to be authenticated, the support part 23, the fingertip detection sensor 50, the finger base detection sensor 60, etc. Even when the device is shared in a residential building or office where multiple users enter and exit, a hygienic condition can be maintained that does not allow the spread of pathogens such as viruses and bacteria to users.

In the above embodiment, the finger F of the person to be authenticated is inserted into the insertion hole 21 of the housing 20 with the back side F1 of the finger F positioned on the upper side and the palm side F2 positioned on the lower side, and the blood vessel pattern is imaged and authentication is performed with the back side F1 of the finger F abutting against the upper side of the inner wall surface of the insertion hole 21. However, the present invention is not limited to this, and it is contemplated that the blood vessel pattern may be imaged by irradiating the back side F1 of the finger F with light from the near-infrared light source 30 inside the housing 20.

For example, the finger F of the person to be authenticated can be inserted into the insertion hole 21 of the housing 20 with the back side F1 positioned downward and the palm side F2 positioned upward, or the finger F can be inserted into the insertion hole 21 with the back side F1 positioned on the right or left side and the palm side F2 positioned on the left or right side. Furthermore, the finger F can be inserted into the insertion hole 21 with the back side F1 tilted in a direction other than up, down, left, or right.

Furthermore, the shape of the insertion hole 21 of the housing 20, and the shapes and dimensions of the fingertip detection sensor 50 and finger base detection sensor 60 can be modified as appropriate. In addition, it is possible to omit some components, and of course to use a partially extracted configuration.

10 Terminal device for blood flow authentication device 20 Housing 21 Insertion hole 22 Light-transmitting plate 23 Support portion 24 Lid portion 30 Near-infrared light source 31 Ultraviolet light source 40 Imaging device 50 Fingertip detection sensor 60 Finger base detection sensor 70 Filter 80 Light reflecting member F Finger

Claims (3)

A housing having an insertion hole for inserting a finger;
a near-infrared light source that irradiates near-infrared light into the inside of the housing toward the back of the finger that is inserted with the back of the finger in contact with the inner wall surface of the insertion hole without the palm of the finger in contact with the inner wall surface of the insertion hole;
an ultraviolet light source that irradiates ultraviolet light into the insertion hole;
an imaging unit that images the near-infrared light irradiated from the near-infrared light source and transmitted through the finger at a position facing the near-infrared light source;
a fingertip detection sensor that is installed at a position corresponding to the tip of the finger that is in contact with the inner wall surface, and that positions the fingertip by the contact of the fingertip and detects the contact of the fingertip;
a fingertip detection sensor that is installed at a position corresponding to the fingertip of the finger that is in contact with the inner wall surface and detects the contact of the fingertip;
a terminal device for the blood flow authentication device, the terminal device having a lid portion that covers the insertion hole in an openable and closable manner;
A blood flow authentication device, characterized in that the ultraviolet light source is controlled to be turned off when the cover is open and to be turned on when the cover is closed. The blood flow authentication device according to claim 1, characterized in that the terminal device for the blood flow authentication device is provided with a light reflecting member that receives ultraviolet light from the ultraviolet light source and is installed in the insertion hole at a position capable of reflecting the ultraviolet light. The blood flow authentication device according to claim 1 or 2, characterized in that the ultraviolet light source is installed on at least one of the back side or palm side of the finger to be inserted in the terminal device for the blood flow authentication device.

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