JP2014099149A - Terminal equipment for blood flow authentication device, and blood flow authentication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide terminal equipment for a blood flow authentication device and a blood flow authentication device capable of preventing a reduction in recognition rate even for an authentication target person who is not familiar with a blood flow authentication device, and providing clearer images than before.SOLUTION: Terminal equipment for a blood flow authentication device comprises: a housing to which an insertion hole for inserting a finger is provided; a light source that irradiates the back side of a finger with light from the inside of the housing, the finger being inserted into the insertion hole with the palm side not in contact with an inner wall surface of the insertion hole, and with the back side in contact with the inner wall surface; and an imaging unit that photographs the light applied from the light source and transmitted through the finger at a position opposite to the light source inside the housing.

Description

  The present invention relates to a terminal device for a blood flow authentication device and a blood flow authentication device that perform personal authentication using a blood vessel pattern obtained by imaging light transmitted through a human finger.

  Conventionally, fingerprint authentication is known as a personal authentication technique for performing personal authentication. However, blood flow authentication based on a blood vessel pattern has been developed due to the problem that a fingerprint of another person can be counterfeited.

  In the blood flow authentication, blood vessel patterns are independent of each other, and the same shape does not exist. Further, since it is difficult to judge the blood vessel from its appearance, it is difficult to forge, and authentication can be performed with high accuracy.

  For example, a base on which a finger is placed and a fingertip placed on one end of the base and in front of the fingertip placed on the base, irradiates light from the fingertip to the fingertip from the front of the fingertip toward the back of the finger A blood vessel image of the finger obtained by transmitting the light emitted from the light source through the finger is installed on the base corresponding to directly under the finger on the ventral side of the finger placed on the base and the light source What is provided with an imaging device is well-known (refer patent document 1).

JP2012-084061A

  In the above structure, at the time of imaging, the person to be authenticated places the finger on the base, but for example, from the act of fixing the finger for the person to be authenticated who is not familiar with the use of the blood flow authentication device. There is a possibility that a finger is psychologically pressed against the base more than necessary. As a result, the blood vessels distributed on the palm side of the placed finger are compressed, so that the blood flow deteriorates, and there is a concern that the recognition rate may be lowered due to a reduction in the imaging effect.

  Therefore, the present invention solves such a problem and prevents the recognition rate from decreasing even if the person is not familiar with the use of the blood flow authentication device. It is an object of the present invention to provide a highly accurate blood flow authentication device terminal device and a blood flow authentication device that can obtain a clearer image.

  In order to solve the above problems, a terminal device for a blood flow authentication device according to claim 1 of the present invention includes a housing provided with an insertion hole for inserting a finger, and an inner wall surface of the insertion hole. A light source that irradiates light from the inside of the housing to the back side of the finger inserted with the back side of the finger in contact with the inner wall surface without contacting the palm side, and the finger is transmitted And an imaging unit that images the light emitted from the light source inside the housing at a position facing the light source.

  Moreover, the terminal device for blood flow authentication devices according to claim 2 of the present invention supports both sides of the finger in contact with the inner wall surface in the terminal device for blood flow authentication devices according to claim 1. And a support portion that blocks the incidence of the light irradiated to the imaging device from the both side surfaces.

  Moreover, the terminal device for blood flow authentication devices according to claim 3 of the present invention is the terminal device for blood flow authentication devices according to claim 1 or 2, wherein the inner wall surface of the finger is in contact with the back side of the finger. A light transmitting plate is provided at a position through which light emitted from the light source can be transmitted.

  Moreover, the terminal device for blood flow authentication devices according to claim 4 of the present invention is in contact with the inner wall surface in the terminal device for blood flow authentication devices according to any one of claims 1 to 3. A fingertip detection sensor that is installed at a position corresponding to the fingertip of the finger and that positions the fingertip by contact of the fingertip and detects contact of the fingertip; and a finger of the finger that is in contact with the inner wall surface It is installed at a position corresponding to the original, and includes a fingertip detection sensor that detects contact of the fingertip.

  Moreover, the terminal device for blood flow authentication devices according to claim 5 of the present invention is the terminal device for blood flow authentication devices according to claim 4, wherein the fingertip detection sensor is in contact with the fingertip, and It has a height at which the fingernail does not come into contact.

  A blood flow authentication device according to claim 6 of the present invention is the blood flow authentication device terminal device according to any one of claims 1 to 5, the light source, the finger detection sensor, the And an authentication control device that controls the finger detection sensor and the imaging device, and forms a blood vessel pattern to be used for personal authentication from an image captured by the imaging device, and performs matching processing.

  In the terminal device for blood flow authentication device and the blood flow authentication device of the present invention, the finger back side is brought into contact with the inner wall surface without contacting the palm side of the finger with the inner wall surface in the insertion hole provided in the housing. Then, the blood vessel pattern is imaged by irradiating the back of the finger with the light of the light source from the inside of the housing. Thereby, even if it is a to-be-authenticated person who is not familiar with use of a blood-flow authentication apparatus, the blood vessel distributed on the palm side of a finger is not compressed. Therefore, it is possible to prevent a recognition rate from being lowered due to a reduction in the imaging effect, and to obtain a clearer image than in the past.

It is a longitudinal cross-sectional view of the terminal device for blood-flow authentication apparatuses in the Example of this invention. It is AA sectional drawing of the terminal device for blood-flow authentication apparatuses in the Example of this invention. It is BB sectional drawing of the terminal device for blood-flow authentication apparatuses in the Example of this invention. It is a flowchart figure which shows the blood flow authentication operation | movement of the blood flow authentication apparatus in the Example of this invention.

  Hereinafter, a terminal device for a blood flow authentication device and a blood flow authentication device according to an embodiment of the present invention will be described with reference to the drawings. The blood authentication device is inserted into the insertion hole of the housing with the back side of the finger of the person to be authenticated positioned on the upper side and the palm side positioned on the lower side, and above the inner wall surface of the insertion hole. The blood vessel pattern is imaged in a state in which the back side of the finger is in contact, and authentication is performed.

  The blood flow authentication device terminal device 10 according to the present invention performs authentication of the blood vessel pattern of the person to be authenticated, control of the light source emission, finger detection sensor, imaging device, etc., storage of the registered or imaged blood vessel pattern, matching processing, etc. A blood flow authentication device is configured by being connected to an authentication control device (not shown). As shown in FIG. 1 to FIG. 3, the terminal device for blood flow authentication device mainly includes a housing 20 into which a finger F of a person to be authenticated for imaging a blood pattern is inserted, a light source 30, and an imaging device 40. I have.

  The housing 20 is provided with an insertion hole 21 for inserting the finger F of the person to be authenticated who images the blood pattern. Inside the housing 20, an LED serving as the light source 30 is disposed above the insertion hole 21 along the axial direction of the insertion hole 21. On the other hand, the imaging device 40 is disposed in the housing 20 at a position facing the light source 30 below the insertion hole 21.

  Further, a light transmitting plate 22 made of synthetic resin such as acrylic that allows the light source 30 to transmit is interposed on the inner wall surface located above the insertion hole 21, and the finger F of the person to be authenticated directly connects to the light source 30. To prevent contact.

  Further, as shown in FIG. 2, a pair of left and right support portions 23 are provided on the inner wall surface located on the upper side of the housing 20, centering on the light source 30 disposed along the axial direction of the insertion hole 21. Protrusively provided.

  The support unit 23 supports both sides of the finger F of the person to be authenticated who performs blood flow authentication. Specifically, the finger F of the person to be authenticated is located immediately below the light source 30 and the inner wall surface of the insertion hole 21 in the housing 20 is in contact with the back side F1 of the finger F of the person to be authenticated. It supports the both side surfaces.

  The support portion 23 is composed of a pair of left and right, and both are provided so as to project along the inner wall surface of the insertion hole 21 with a predetermined gap. That is, depending on the shape of the insertion hole 21, it may be linear with respect to the axial direction or may be curved. Further, it is desirable that the support portion 23 is formed with a length corresponding to substantially the entire length in the longitudinal direction of the finger F, and is formed in a substantially arc shape so that a portion in contact with the finger F is along the side surface of the finger. . The support part 23 thus formed is formed of a material that blocks visible light and near infrared light. Thereby, the wraparound of the light from the light source 30 to the imaging device 40 can be reduced, and the occurrence of halation during imaging can be suppressed.

  Moreover, although the support part 23 supports one finger | toe F to authenticate, the same support part can also be provided in the one side or both sides of the said support part 23. FIG. In this manner, by providing a plurality of support portions, it is possible to support other adjacent fingers other than the finger F to be authenticated. Thereby, what is called rolling which the finger F supported by the support part rotates along the axis | shaft of the said finger F can be prevented. By preventing rolling, the captured image can be made constant, and a clearer blood vessel pattern can be captured.

  A fingertip detection sensor 50 is provided at a position corresponding to the fingertip of the finger F inserted through the insertion hole 21, and a fingertip detection sensor 60 is provided at a position corresponding to the fingertip of the finger F. A filter 70 that blocks light other than near-infrared light is provided inside the housing 20 and above the imaging device 40.

  The light source 30 is made of a member that emits near-infrared light such as an LED having a condensing lens 31 at the tip. In the present embodiment, five LEDs are arranged along the axial direction of the insertion hole 21 in the housing 20, that is, the longitudinal direction of the finger F, but the present invention is not limited to this. For example, the number of light emitting elements is not limited to the number, and the light emitting elements can be integrated into an elongated shape. The amount of light emitted from the light source 30 can be controlled by a light amount adjusting means.

  The imaging device 40 captures a blood vessel image obtained by transmitting the finger F and the filter 70 out of the light emitted from the light source 30. The imaging device 40 includes an imaging device, an optical system including a lens, and an imaging drive circuit, and is installed at a position facing the light source 30 inside the housing 20 and below the insertion hole 21. The Specifically, the optical axis of the imaging device 40 is installed at a position below the substantially central portion in the longitudinal direction where the light source 30 is installed. Further, the imaging device 40 is slightly focused on the inner side of the finger from the skin on the palm side of the person to be authenticated in order not to recognize the fingerprint or the like.

  The fingertip detection sensor 50 detects the fingertip F3 of the person to be authenticated that is inserted through 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 of, for example, a short metal plate. When the fingertip F3 of the person to be authenticated contacts the fingertip detection sensor 50, the fingertip F3 in the axial direction in the insertion hole 21 is positioned, and the contact is electrically detected. Specifically, the contact is detected by a change in capacitance.

  The fingertip detection sensor 50 is installed with a height that the fingertip F3 of the person to be authenticated abuts and the nail F4 of the finger F of the person to be authenticated does not abut. For example, it may be installed at the front end of a substantially L-shaped member that protrudes downward from above the inner wall surface of the insertion hole 21 in the housing 20, It may be installed at the tip of a member provided with a hole through which the authenticator's claw F4 can be inserted.

  The fingertip detection sensor 60 detects the fingertip F5 of the person to be authenticated that is inserted through the insertion hole 21 of the housing 20. The fingertip detection sensor 60 is installed at a position corresponding to the fingertip F5 of the finger F supported by the support portion 23, and is formed of, for example, a short metal plate. When the fingertip F5 of the person to be authenticated contacts the fingertip detection sensor 60, the contact is electrically detected. Specifically, the contact is detected by a change in capacitance.

  Further, the finger detection sensor 60 is such that the finger F of the person to be authenticated is located immediately below the light source 30 and the inner wall surface of the insertion hole 21 in the housing 20 contacts the back side F1 of the finger F of the person to be authenticated. In the state, it is installed so as to contact the back side F1 of the fingertip F5. In the finger detection sensor 60, it is desirable that the lower end surface with which the finger F5 contacts is formed in a substantially arc shape so as to match the shape of the finger F5. Accordingly, the finger F5 of the person to be authenticated can be reliably supported, and the finger F can be reliably detected. Then, when both the fingertip detection sensor 50 and the fingertip detection sensor 60 detect the finger F of the person to be authenticated, the blood flow authentication operation can be started.

  The blood flow authentication device terminal device 10 is configured as described above, and a blood flow authentication device configured by connecting an authentication control device (not shown) thereto will be described with reference to FIG. The authentication control device performs authentication of the blood vessel pattern of the person to be authenticated, control of the light source emission, finger detection sensor, imaging device, and the like, storage of the registered or imaged blood vessel pattern, matching processing, and the like.

  First, in S <b> 10, the person to be authenticated causes the upper side F <b> 1 to contact the translucent plate 22 along the support portion 23 with the finger F. In S <b> 11, it is determined whether or not the finger F is detected by both the fingertip detection sensor 50 and the fingertip detection sensor 60 by the operation of the person to be authenticated. The determination is performed by an authentication control device connected to the blood flow authentication device 10. If the determination result is affirmative, the process proceeds to S12.

  In S12, the authentication control device causes the LED serving as the light source 30 to emit light, and irradiates light from the back side F1 of the finger F of the person to be authenticated. Then, for example, when the illuminance of the LED is stabilized by the predetermined setting in the light amount adjusting means, the process proceeds to S13.

  In S13, the image pickup device 40 is operated by the authentication control device, and the finger F is picked up. The captured image is supplied to the authentication control device. In the imaging, after capturing a plurality of images for each appropriate illuminance, a predetermined area may be cut out and connected to form an image of one finger F, or one image from a predetermined illuminance. It is also possible to capture only the image. The image processing is not limited to this, and can be performed by appropriately combining the processing.

  In S14, the authentication control device determines whether or not the captured image matches the registered image of the person to be authenticated. At this time, in the blood flow authentication, in this embodiment, the vein shape is pattern extracted and image processing is performed in the same manner as in the past, and feature point extraction and feature point matching are performed. It can also be adopted.

  As a result of blood flow authentication, if the captured image matches the registered image, or if it is equal to or higher than a predetermined matching rate, the authentication control device determines that the person to be authenticated is a suitable person, and sends an unlocking signal, for example And unlock the door.

  As described above, according to the terminal device 10 for blood flow authentication device and the blood flow authentication device according to the present invention described above, the palm side F2 of the finger F is brought into contact with the lower side of the inner wall surface in the insertion hole 21 provided in the housing 20. The upper side F1 of the finger F is brought into contact with the upper side of the inner wall surface, and the blood vessel pattern is imaged by irradiating the upper side F1 of the finger F with light from the light source 30 from above the inside of the housing 20. Is to do. Thereby, even if it is a to-be-authenticated person who is not familiar with use of a blood-flow authentication apparatus, the blood vessel distributed on the palm side F2 of the finger F is not compressed. Therefore, it is possible to prevent a recognition rate from being lowered due to a reduction in the imaging effect, and to obtain a clearer image than in the past.

  Moreover, in the said Example, it inserts in the insertion hole 21 of the housing | casing 20 in the state which has arrange | positioned the upper side F1 of a to-be-authenticated person's finger F, and arrange | positioned the palm side F2 in the downward side, The blood vessel pattern is imaged and authenticated in a state where the upper side F1 of the finger F is in contact with the upper side of the inner wall surface in 21, but the present invention is not limited to this. On the other hand, what is necessary is just to irradiate the light of the light source 30 from the inside of the housing | casing 20 and to image a blood vessel pattern.

  For example, the back side F1 of the finger F of the person to be authenticated can be disposed on the lower side, and the palm side F2 can be inserted into the insertion hole 21 of the housing 20 with the palm side F2 disposed on the upper side. It can also be configured such that the side F1 can be inserted into the insertion hole 21 with the side F1 disposed on the right or left side and the palm side F2 disposed on the left or right side. Furthermore, it can also be comprised so that it can insert in the insertion hole 21 in the state which inclined and arrange | positioned the upper side F1 other than the up-down left-right direction.

  Furthermore, the shape of the insertion hole 21 of the housing 20 and the shapes and dimensions of the fingertip detection sensor 50 and the fingertip detection sensor 60 can be changed as appropriate. Of course, a part of the configuration can be omitted, and a part of the configuration can be extracted.

DESCRIPTION OF SYMBOLS 10 Terminal apparatus 20 for blood-flow authentication apparatuses Case 21 Insertion hole 22 Translucent plate 23 Support part 30 Light source 40 Imaging device 50 Fingertip detection sensor 60 Fingertip detection sensor 70 Filter F Finger

Claims (6)

A housing provided with an insertion hole for inserting a finger;
The light from the inside of the housing is lighted against the back side of the finger inserted by bringing the back side of the finger into contact with the inner wall surface without bringing the palm side of the finger into contact with the inner wall surface of the insertion hole. A light source for irradiating
An imaging unit that images the light emitted from the light source that has passed through the finger inside the housing at a position facing the light source;
A terminal device for a blood flow authentication device, comprising:   The blood flow authentication device terminal according to claim 1, further comprising a support portion that supports both side surfaces of the finger that is in contact with the inner wall surface, and that blocks incidence of the light that is irradiated from the both side surfaces to the imaging device. machine.   The terminal device for a blood flow authentication device according to claim 1 or 2, further comprising a translucent plate capable of transmitting light emitted from the light source at a position of the inner wall surface that contacts the back side of the finger. A fingertip detection sensor installed at a position corresponding to the fingertip of the finger that is in contact with the inner wall surface, positioning the fingertip by contact of the fingertip, and detecting contact of the fingertip;
A finger 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;
The blood flow authentication device terminal device according to any one of claims 1 to 3, further comprising:   5. The blood flow authentication device terminal device according to claim 4, wherein the fingertip detection sensor has a height at which the fingertip abuts and a fingernail does not abut. The terminal device for blood flow authentication device according to any one of claims 1 to 5,
An authentication control device that performs matching processing by forming a blood vessel pattern for use in personal authentication from the image picked up by the light source, the fingertip detection sensor, the fingertip detection sensor, and the imaging device, and the image captured by the imaging device; ,
A blood flow authentication device comprising:

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