Detection Device

Abstract

To provide a detection device which can be attached all the time and can detect a plurality of different kinds of images.SOLUTION: A detection device 1 comprises: a ring-shaped housing which can be attached on a living body; a first light source 61 provided inside the housing for emitting near infrared light; a light sensor 10 capable of detecting the near infrared light; and a control circuit 140 which controls lighting of the first light source 61. The control circuit 140 measures a perfusion index of a blood flow based on image data acquired by the light sensor 10 when emitting the near infrared light, determines the image data as a vein image D10 when the perfusion index is a predetermined value or greater, and determines the image data as a dermal ridge pattern image D20 of a biological surface when the perfusion index is smaller than the predetermined value.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a detection device. [Background technology]

[0002] For personal authentication, an authentication device that uses biometric features to authenticate a person is known. Patent Document 1 discloses that the device determines the distance to the living body and the posture of the living body from a captured image, instructs the user to correct the distance to the living body and the posture of the living body based on the determination, and compares the similarity between feature information extracted from the image and stored feature information. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-91186 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, in a ring-shaped biometric sensor that detects biometric information such as pulse rate and blood oxygen saturation (SpO2), the device that calculates the biometric authentication function to link the sensor to the wearer is large and heavy, making it difficult to wear conventional authentication devices all the time in daily life.

[0005] An object of the present invention is to provide a detection device that can be worn at all times and that can detect a plurality of different types of images. [Means for solving the problem]

[0006] A detection device according to one aspect of the present invention includes a ring-shaped housing that can be attached to a living body, a first light source that is provided inside the housing and that irradiates near-infrared light, an optical sensor that can detect the near-infrared light, and a control circuit that controls the lighting of the first light source. The control circuit measures a perfusion index of blood flow based on image data acquired by the optical sensor when the near-infrared light is irradiated, and determines that the image data is a vein image when the perfusion index is equal to or greater than a predetermined value, and determines that the image data is a skin pattern image of the surface of the living body when the perfusion index is smaller than the predetermined value.

[0007] A detection device according to one aspect of the present invention includes a ring-shaped housing that can be attached to a living body, a first light source that is provided inside the housing and that irradiates near-infrared light, an optical sensor that can detect the near-infrared light, a pressure sensor that can detect different states of pressure of an object inserted into a through-hole in the housing, and a control circuit that controls the lighting of the first light source, wherein when the near-infrared light is irradiated, the control circuit determines that the image data acquired by the optical sensor is a vein image if the value of the pressure sensor is equal to or less than a pressure threshold, and determines that it is a skin pattern image on the surface of the living body if the value is greater than the pressure threshold. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing an example of the configuration and arrangement of a detection device according to the first embodiment, with a finger placed inside, as viewed from one end of the housing. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along the line AA shown in FIG. [Figure 3] FIG. 3 is an external view of the detection device shown in FIG. 1 when not attached. [Figure 4] FIG. 4 is a configuration diagram showing an example of a light source and an optical sensor of the detection device according to the first embodiment. [Figure 5] FIG. 5 is a block diagram illustrating an example of the configuration of the detection device according to the first embodiment. [Figure 6] FIG. 6 is a circuit diagram showing the detection device. [Figure 7] FIG. 7 is a circuit diagram showing a plurality of partial detection areas. [Figure 8] FIG. 8 is a diagram illustrating an example of the configuration of the power receiving element and the battery. [Figure 9] FIG. 9 is a configuration diagram illustrating an example of the functional configuration of the detection device according to the first embodiment. [Figure 10] FIG. 10 is a diagram for explaining a detection example of the detection device when the finger is in an extended state. [Figure 11] FIG. 11 is a diagram for explaining a detection example of the detection device when the finger is in a bent state. [Figure 12] FIG. 12 is a flowchart illustrating an example of a processing procedure executed by the detection device according to the first embodiment. [Figure 13] FIG. 13 is a diagram illustrating an example of a vein image, a skin pattern image, and a composite image. [Figure 14] FIG. 14 is a configuration diagram illustrating an example of the functional configuration of the detection device according to the second embodiment. [Figure 15] FIG. 15 is a cross-sectional view of the detection device according to the second embodiment. [Figure 16] FIG. 16 is a flowchart illustrating an example of a processing procedure executed by the detection device according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Modes for carrying out the invention (embodiments) will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. Furthermore, the components described below include those that can be easily imagined by a person skilled in the art and those that are substantially identical. Furthermore, the components described below can be combined as appropriate. Note that the disclosure is merely an example, and any appropriate modifications that a person skilled in the art can easily conceive while maintaining the gist of the invention are naturally included within the scope of the present invention. Furthermore, for clarity of explanation, the drawings may show the width, thickness, shape, etc. of each part schematically compared to the actual embodiment. However, these are merely examples and are not intended to limit the interpretation of the present invention. Furthermore, in this specification and each figure, elements similar to those previously described with reference to the preceding figures are designated by the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0010] In this specification and claims, when expressing an aspect of placing another structure on top of a certain structure, the term "on top" is used, unless otherwise specified, to include both a case in which another structure is placed directly on top of a certain structure so as to be in contact with the certain structure, and a case in which another structure is placed above a certain structure via yet another structure.

[0011] (Embodiment 1) [Detection device] Fig. 1 is a schematic diagram showing an example of the configuration of a detection device according to embodiment 1 when a finger is placed inside the detection device as viewed from one end of a housing. Fig. 2 is a schematic cross-sectional view taken along line AA shown in Fig. 1. Fig. 3 is an external view of the detection device shown in Fig. 1 when not being worn.

[0012] The detection device 1 shown in FIGS. 1 and 2 is a ring-shaped device that can be attached or detached to the person to be authenticated, and is worn on the person's finger Fg. The finger Fg includes the thumb, index finger, middle finger, ring finger, little finger, etc., and is an example of a living body. The person to be authenticated is a person whose identity is verified by the detection device 1, and is an example of a living body. The detection device 1 includes a housing 200, a light source 60, an optical sensor 10, a battery 300, and a wireless power receiving element 410. The detection device 1 operates using power supplied from the battery 300. The detection device 1 is configured to receive power wirelessly via the power receiving element 410 and charge the battery 300. The detection device 1 may also include a wristband.

[0013] As shown in FIG. 3, the housing 200 is formed in a ring shape that can be worn on the finger Fg of the person to be authenticated, and the inner diameter is sized according to the size of the finger Fg to be worn. The housing 200 is formed in a ring shape (annular shape) using a material such as ceramics, synthetic resin, metal, or alloy. In this embodiment, the housing 200 is formed from ceramics, thereby improving the power transmission efficiency compared to a metal housing made from metal. The housing 200 has an inner peripheral surface 210 and an outer peripheral surface 220. As shown in FIG. 2, the housing 200 is formed to a size that allows it to move in the attachment / detachment direction V1 with respect to the finger Fg. The inner peripheral surface 210 is a surface that comes into contact with or faces the finger Fg positioned inside the housing 200. The outer peripheral surface 220 is a surface that approaches or comes into contact with another object as the worn finger Fg moves.

[0014] As shown in FIGS. 1 and 2 , the housing 200 has multiple light sources 60, an optical sensor 10, a battery 300, and a power receiving element 410 disposed therein. When the housing 200 is worn on a finger Fg, the optical sensor 10, the battery 300, and the power receiving element 410 are disposed in a first region 230 that is close to the finger pad Fg-1. The finger pad Fg-1 is located on the inside of the finger Fg when the hand is closed. The first region 230 is a region set below the housing 200. The optical sensor 10, the battery 300, and the power receiving element 410 are arranged in this order from the inner circumferential surface 210 side of the housing 200. That is, the housing 200 is arranged so that the power receiving element 410 is near the outer circumferential surface 220. A member of the housing 200, an insulating member, etc. may be provided between the optical sensor 10, the battery 300, and the power receiving element 410.

[0015] When the housing 200 is worn on a finger Fg, the power receiving element 410 is disposed closer to the outer peripheral surface 220 on the finger pad Fg-1 side. The first region 230 of the housing 200 is set based on the range facing the finger pad Fg-1. The housing 200 may be configured so that the optical sensor 10 is exposed from the inner peripheral surface 210, or may be configured so that the optical sensor 10 is housed near the inner peripheral surface 210. The housing 200 is configured so that the power receiving element 410 is housed near the outer peripheral surface 220 and a magnetic field passes through the housing 200. The power receiving element 410 is provided in the housing 200 so as to be able to receive power from the battery 300. As a result, when the person to be authenticated operates the operation object 1000, the detection device 1 can move the housing 200 in the approach direction V2 to bring the housing 200 closer to the power supply device 500 of the operation object 1000. The power supply device 500 is a device that supplies power wirelessly, and is incorporated into the operation target object 1000.

[0016] Furthermore, the housing 200 has multiple light sources 60 in a second region 240 that is close to the finger back Fg-2 when the housing 200 is worn on the finger Fg. The finger back Fg-2 is located on the outer side of the finger Fg when the hand is closed. The second region 240 is an area set above the housing 200 and faces the first region 230. The housing 200 has the first region 230 and a second region 24 positioned above the first region 230. The second region 240 is provided so that the multiple light sources 60 can irradiate light rays toward the optical sensor 10.

[0017] Fig. 4 is a configuration diagram showing an example of the light source 60 and the optical sensor 10 of the detection device 1 according to the first embodiment. In the example shown in Fig. 4, the optical sensor 10 has a sensor substrate 21. The light source 60 has a plurality of first light sources 61 and second light sources 62. Note that in Figs. 1 and 2 described above, the number of light sources 60 is shown to be small for the sake of simplicity.

[0018] The control board 121 is electrically connected to the sensor board 21 via a flexible printed circuit board 71. The flexible printed circuit board 71 is provided with a detection circuit 48. The control board 121 is provided with a control circuit 122 and a power supply circuit 123. The control circuit 122 is, for example, an FPGA (Field Programmable Gate Array). The control circuit 122 supplies control signals to the optical sensor 10, the gate line driving circuit 15, and the signal line selection circuit 16 to control the detection operation of the optical sensor 10. The control circuit 122 also supplies control signals to the first light source 61 and the second light source 62 to control the lighting or non-lighting of the first light source 61 and the second light source 62. The power supply circuit 123 also supplies voltage signals, such as a sensor power supply signal VDDSNS (see FIG. 7), to the optical sensor 10, the gate line driving circuit 15, and the signal line selection circuit 16. The power supply circuit 123 also supplies a power supply voltage to the first light source 61 and the second light source 62.

[0019] The sensor substrate 21 has a detection area AA and a peripheral area GA. The detection area AA is an area where multiple photodiodes PD of the optical sensor 10 are provided. The peripheral area GA is an area between the outer periphery of the detection area AA and the edge of the sensor substrate 21, and is an area that does not overlap with the photodiodes PD.

[0020] Of the four sides of the detection area AA that form the boundary between the rectangular detection area AA and the surrounding area GA, one side CP1 becomes one end of the first area 230. In addition, the other side CP2 of the four sides of the detection area AA, which is located opposite the one side with the detection area AA in between, becomes the other end of the first area 230.

[0021] The gate line driving circuit 15 and the signal line selection circuit 16 are provided in the peripheral area GA. Specifically, the gate line driving circuit 15 is provided in a region of the peripheral area GA extending along the second direction Dy. The signal line selection circuit 16 is provided in a region of the peripheral area GA extending along the first direction Dx, and is provided between the photosensor 10 and the detection circuit 48.

[0022] The first direction Dx is a direction in a plane parallel to the sensor substrate 21. The second direction Dy is a direction in a plane parallel to the sensor substrate 21 and is a direction perpendicular to the first direction Dx. The second direction Dy may intersect with the first direction Dx without being perpendicular thereto. The third direction Dz is a direction perpendicular to the first direction Dx and the second direction Dy and is a normal direction to the sensor substrate 21.

[0023] The multiple first light sources 61 are provided on the first light source substrate 51 and are arranged along the second direction Dy. The multiple second light sources 62 are provided on the second light source substrate 52 and are arranged along the second direction Dy. The first light source substrate 51 and the second light source substrate 52 are electrically connected to the control circuit 122 and the power supply circuit 123 via terminals 124 and 125 provided on the control board 121, respectively. The multiple first light sources 61 and the multiple second light sources 62 are provided along the finger Fg in the attachment / detachment direction V1 (see FIG. 2 ) and are arranged to face the optical sensor 10.

[0024] The first light sources 61 and the second light sources 62 may be, for example, inorganic light emitting diodes (LEDs) or organic light emitting diodes (OLEDs). The first light sources 61 and the second light sources 62 emit first light and second light, respectively, having different wavelengths. In this embodiment, the first light source 61 emits near-infrared light having a wavelength of 880 nm. The second light source 62 emits red light having a wavelength of 665 nm. During detection, the first light source 61 and the second light source 62 are alternately turned on. Therefore, the photodiode PD alternately receives reflected red light and near-infrared light.

[0025] The reflected near-infrared light contains information for detecting the vascular pattern. Red blood cells contained in blood contain hemoglobin. The near-infrared light emitted from the first light source 61 is easily absorbed by hemoglobin. In other words, the absorption coefficient of hemoglobin for near-infrared light is higher than that of other parts inside the body. Therefore, by reading the amount of light received by the multiple photodiodes PD and identifying areas where the amount of infrared light received is relatively low, vascular patterns such as veins can be detected.

[0026] The reflected near-infrared and red light also contain information for measuring the oxygen saturation in the blood (hereinafter referred to as blood oxygen saturation (SpO2)). Blood oxygen saturation (SpO2) is the ratio of the amount of oxygen actually bound to hemoglobin to the total amount of oxygen assumed to be bound to all hemoglobin in the blood.

[0027] Near-infrared light is easily absorbed by hemoglobin. As the amount of hemoglobin increases, the amount of near-infrared light absorbed also increases, and the amount of light received by the photodiode PD also decreases. In other words, the total amount of hemoglobin can be determined from the amount of reflected near-infrared light received.

[0028] On the other hand, hemoglobin is dark red when not bound to oxygen, and turns bright red when bound to oxygen. Therefore, hemoglobin has a different absorption coefficient for absorbing red light when bound to oxygen and when not bound to oxygen. Therefore, if there is a lot of hemoglobin bound to oxygen in the blood, there will be a lot of reflected red light. On the other hand, if there is a lot of hemoglobin not bound to oxygen in the blood, there will be less reflected red light. From the above, the amount of hemoglobin bound to oxygen can be relatively determined based on the amount of reflected red light received.

[0029] Then, by comparing the determined total amount of hemoglobin with the amount of hemoglobin bound to oxygen, the ratio of the amount of oxygen actually bound to hemoglobin (blood oxygen saturation (SpO2)) can be determined. As a result, the detection device 1 has the first light source 61 and the plurality of second light sources 62, and therefore can detect information about the internal living body of the finger Fg, etc., by performing detection based on the first light and detection based on the second light. The detection device 1 can supply information about the living body, including the detected blood oxygen saturation, pulse rate, etc., to the control board 121 via the flexible printed circuit board 71.

[0030] In the present disclosure, the wavelengths of the light emitted from the first light source 61 and the second light source 62 are not limited to those described above. The first light source 61 may emit near-infrared light having a wavelength of 800 to less than 1000 nm. The second light source 62 may emit red light having a wavelength of 600 to less than 800 nm.

[0031] The arrangement of the first light source 61 and the second light source 62 shown in FIG. 4 is merely an example and can be changed as appropriate. For example, a plurality of first light sources 61 and a plurality of second light sources 62 may be arranged on each of the first light source substrate 51 and the second light source substrate 52. In this case, a group including a plurality of first light sources 61 and a group including a plurality of second light sources 62 may be arranged side by side in the second direction Dy, or the first light sources 61 and the second light sources 62 may be arranged alternately in the second direction Dy. Furthermore, the number of light source substrates on which the first light source 61 and the second light source 62 are provided may be one or three or more. The detection device 1 may have one each of the first light source 61 and the second light source 62.

[0032] 5 is a block diagram showing an example of the configuration of the detection device 1 according to embodiment 1. As shown in FIG. 5, the detection device 1 further includes a detection control circuit 11 and a detection circuit 40. Some or all of the functions of the detection control circuit 11 are included in a control circuit 122. In addition, some or all of the functions of the detection circuit 40 other than the detection circuit 48 are included in the control circuit 122.

[0033] The optical sensor 10 is an optical sensor having a photodiode PD, which is a photoelectric conversion element. The photodiode PD of the optical sensor 10 outputs an electrical signal corresponding to the incident light as a detection signal Vdet to the signal line selection circuit 16. The optical sensor 10 also performs detection in accordance with a gate drive signal Vgcl supplied from the gate line drive circuit 15.

[0034] The detection control circuit 11 is a circuit that supplies control signals to the gate line drive circuit 15, the signal line selection circuit 16, and the detection circuit 40, respectively, and controls their operations. The detection control circuit 11 supplies various control signals, such as a start signal STV, a clock signal CK, and a reset signal RST1, to the gate line drive circuit 15. The detection control circuit 11 also supplies various control signals, such as a selection signal ASW, to the signal line selection circuit 16. The detection control circuit 11 also supplies various control signals to the first light source 61 and the second light source 62, and controls the lighting and non-lighting of each.

[0035] The gate line driving circuit 15 is a circuit that drives multiple gate lines GCL (see FIG. 6) based on various control signals. The gate line driving circuit 15 selects the multiple gate lines GCL sequentially or simultaneously and supplies a gate driving signal Vgcl to the selected gate lines GCL. In this way, the gate line driving circuit 15 selects multiple photodiodes PD connected to the gate lines GCL.

[0036] The signal line selection circuit 16 is a switch circuit that sequentially or simultaneously selects a plurality of signal lines SGL (see FIG. 7). The signal line selection circuit 16 is, for example, a multiplexer. The signal line selection circuit 16 connects the selected signal line SGL to the detection circuit 48 based on a selection signal ASW supplied from the detection control circuit 11. As a result, the signal line selection circuit 16 outputs a detection signal Vdet of the photodiode PD to the detection circuit 40.

[0037] The detection circuit 40 includes a detection circuit 48, a signal processing circuit 44, a coordinate extraction circuit 45, a memory circuit 46, a detection timing control circuit 47, and an image processing circuit 49. Based on a control signal supplied from the detection control circuit 11, the detection timing control circuit 47 controls the detection circuit 48, the signal processing circuit 44, the coordinate extraction circuit 45, and the image processing circuit 49 so that they operate in synchronization.

[0038] The detection circuit 48 is, for example, an analog front end (AFE) circuit. The detection circuit 48 is a signal processing circuit having at least the functions of a detection signal amplifier circuit 42 and an A / D conversion circuit 43. The detection signal amplifier circuit 42 amplifies the detection signal Vdet. The A / D conversion circuit 43 converts the analog signal output from the detection signal amplifier circuit 42 into a digital signal.

[0039] The signal processing circuit 44 is a logic circuit that detects a predetermined physical quantity input to the optical sensor 10 based on the output signal of the detection circuit 48. When the finger Fg comes into contact with or close to the detection surface, the signal processing circuit 44 can detect unevenness of the biological surface of the finger Fg or palm based on the signal from the detection circuit 48. The signal processing circuit 44 can also detect information about the living body based on the signal from the detection circuit 48. The information about the living body includes, for example, the pulse rate of the finger Fg, blood oxygen saturation, etc.

[0040] The signal processing circuit 44 may also acquire detection signals Vdet (biological information) simultaneously detected by a plurality of photodiodes PD and average these signals. In this case, the detection circuit 40 can suppress measurement errors caused by noise and relative positional deviation between the object to be detected, such as a finger Fg, and the optical sensor 10, thereby enabling stable detection.

[0041] The memory circuit 46 temporarily stores the signals calculated by the signal processing circuit 44. The memory circuit 46 may be, for example, a RAM (Random Access Memory), a register circuit, or the like.

[0042] The coordinate extraction circuit 45 is a logic circuit that calculates the detected coordinates of the unevenness of the biological surface of the finger or the like when the signal processing circuit 44 detects contact or proximity of a finger. The coordinate extraction circuit 45 is also a logic circuit that calculates the detected coordinates of the blood vessels of the finger Fg or the palm. The image processing circuit 49 combines the detection signals Vdet output from each photodiode PD of the optical sensor 10 to generate two-dimensional information indicating the shape of the unevenness of the biological surface of the finger Fg or the like and two-dimensional information indicating the shape of the blood vessels of the finger Fg or the palm. The coordinate extraction circuit 45 may output the detection signal Vdet as the sensor output Vo without calculating the detection coordinates. The coordinate extraction circuit 45 and the image processing circuit 49 may not be included in the detection circuit 40.

[0043] The detection control circuit 11 has a function of comparing information about the detected biometric information with pre-stored authentication information and authenticating the person to be authenticated based on the comparison result. The detection control circuit 11 also has a function of controlling the transmission of information about the detected biometric information to an external device via a communication device (not shown).

[0044] Next, an example of the circuit configuration of the detection device 1 will be described. Fig. 6 is a circuit diagram showing the detection device 1. Fig. 7 is a circuit diagram showing a plurality of partial detection areas. Note that Fig. 7 also shows the circuit configuration of a detection circuit 48.

[0045] 6, the optical sensor 10 has a plurality of partial detection areas PAA arranged in a matrix. A photodiode PD is provided in each of the partial detection areas PAA.

[0046] The gate lines GCL extend in a first direction Dx and are connected to a plurality of partial detection areas PAA arranged in the first direction Dx. Furthermore, a plurality of gate lines GCL(1), GCL(2), ..., GCL(8) are arranged in a second direction Dy and are each connected to a gate line driving circuit 15. In the following description, when it is not necessary to distinguish between the plurality of gate lines GCL(1), GCL(2), ..., GCL(8), they will be simply referred to as gate lines GCL. Furthermore, for ease of understanding, eight gate lines GCL are shown in FIG. 7, but this is merely an example, and M gate lines GCL (M is 8 or more, for example, M=256) may be arranged.

[0047] The signal line SGL extends in the second direction Dy and is connected to the photodiodes PD of the plurality of partial detection areas PAA arranged in the second direction Dy. The plurality of signal lines SGL(1), SGL(2), ..., SGL(12) are arranged in the first direction Dx and are each connected to the signal line selection circuit 16 and the reset circuit 17. In the following description, when it is not necessary to distinguish between the plurality of signal lines SGL(1), SGL(2), ..., SGL(12), they will simply be referred to as signal lines SGL.

[0048] For ease of understanding, 12 signal lines SGL are shown, but this is merely an example, and N signal lines SGL (N is 12 or more, for example, N=252) may be arranged. In addition, in Fig. 6, the optical sensor 10 is provided between the signal line selection circuit 16 and the reset circuit 17. However, the present invention is not limited to this, and the signal line selection circuit 16 and the reset circuit 17 may be connected to ends of the signal lines SGL in the same direction.

[0049] The gate line driving circuit 15 receives various control signals, such as a start signal STV, a clock signal CK, and a reset signal RST1, from the control circuit 122 (see FIG. 4). Based on the various control signals, the gate line driving circuit 15 sequentially selects multiple gate lines GCL(1), GCL(2), ..., GCL(8) in a time-division manner. The gate line driving circuit 15 supplies a gate driving signal Vgcl to the selected gate line GCL. As a result, the gate driving signal Vgcl is supplied to multiple first switching elements Tr connected to the gate line GCL, and multiple partial detection areas PAA arranged in the first direction Dx are selected as detection targets.

[0050] The gate line driving circuit 15 may perform different driving for each detection mode of the fingerprint detection and multiple different types of biological information (e.g., pulse, blood oxygen saturation, etc.) For example, the gate line driving circuit 15 may drive a bundle of multiple gate lines GCL.

[0051] Specifically, the gate line driving circuit 15 simultaneously selects a predetermined number of gate lines GCL from among the gate lines GCL(1), GCL(2), ..., GCL(8) based on the control signal. For example, the gate line driving circuit 15 simultaneously selects six gate lines GCL(1) to GCL(6) and supplies the gate driving signal Vgcl to them. The gate line driving circuit 15 supplies the gate driving signal Vgcl to a plurality of first switching elements Tr via the six selected gate lines GCL. As a result, detection area groups PAG1 and PAG2, each including a plurality of partial detection areas PAA arranged in the first direction Dx and the second direction Dy, are selected as detection targets. The gate line driving circuit 15 drives the predetermined number of gate lines GCL in a bundle and sequentially supplies the gate driving signal Vgcl to each of the predetermined number of gate lines GCL.

[0052] The signal line selection circuit 16 has a plurality of selection signal lines Lsel, a plurality of output signal lines Lout, and a third switching element TrS. The plurality of third switching elements TrS are provided corresponding to the plurality of signal lines SGL, respectively. The six signal lines SGL(1), SGL(2), ..., SGL(6) are connected to a common output signal line Lout1. The six signal lines SGL(7), SGL(8), ..., SGL(12) are connected to a common output signal line Lout2. The output signal lines Lout1 and Lout2 are each connected to a detection circuit 48.

[0053] Here, the signal lines SGL(1), SGL(2), ..., SGL(6) are defined as a first signal line block, and the signal lines SGL(7), SGL(8), ..., SGL(12) are defined as a second signal line block. The multiple selection signal lines Lsel are connected to the gates of the third switching elements TrS included in one signal line block. Furthermore, one selection signal line Lsel is connected to the gates of the third switching elements TrS of multiple signal line blocks.

[0054] Specifically, the selection signal lines Lsel1, Lsel2, ..., Lsel6 are connected to the third switching elements TrS corresponding to the signal lines SGL(1), SGL(2), ..., SGL(6), respectively. The selection signal line Lsel1 is connected to the third switching element TrS corresponding to the signal line SGL(1) and the third switching element TrS corresponding to the signal line SGL(7). The selection signal line Lsel2 is connected to the third switching element TrS corresponding to the signal line SGL(2) and the third switching element TrS corresponding to the signal line SGL(8).

[0055] The control circuit 122 (see FIG. 4) sequentially supplies the selection signal ASW to the selection signal line Lsel. As a result, the signal line selection circuit 16 sequentially selects the signal lines SGL in one signal line block in a time-division manner through the operation of the third switching element TrS. The signal line selection circuit 16 also selects one signal line SGL in each of the multiple signal line blocks. With this configuration, the detection device 1 can reduce the number of ICs (Integrated Circuits) including the detection circuit 48 or the number of IC terminals.

[0056] The signal line selection circuit 16 may bundle multiple signal lines SGL and connect them to the detection circuit 48. Specifically, the control circuit 122 (see FIG. 4) simultaneously supplies selection signals ASW to the selection signal lines Lsel. As a result, the signal line selection circuit 16 selects multiple signal lines SGL (e.g., six signal lines SGL) in one signal line block through the operation of the third switching element TrS and connects the multiple signal lines SGL to the detection circuit 48. As a result, signals detected in the detection area groups PAG1 and PAG2 are output to the detection circuit 48. In this case, signals from multiple partial detection areas PAA (photodiodes PD) included in the detection area groups PAG1 and PAG2 are integrated and output to the detection circuit 48.

[0057] By performing detection for each of the detection area groups PAG1 and PAG2 through the operation of the gate line driving circuit 15 and the signal line selection circuit 16, the strength of the detection signal Vdet obtained in one detection is improved, thereby improving the sensor sensitivity. Furthermore, the time required for detection can be shortened. Therefore, the detection device 1 can repeatedly perform detection in a short period of time, improving the S / N ratio and enabling accurate detection of temporal changes in information related to a living body, such as pulse waves.

[0058] 6, the reset circuit 17 includes a reference signal line Lvr, a reset signal line Lrst, and a fourth switching element TrR. The fourth switching element TrR is provided corresponding to the plurality of signal lines SGL. The reference signal line Lvr is connected to one of the sources or drains of the plurality of fourth switching elements TrR. The reset signal line Lrst is connected to the gates of the plurality of fourth switching elements TrR.

[0059] The control circuit 122 supplies a reset signal RST2 to the reset signal line Lrst. This turns on the multiple fourth switching elements TrR, and the multiple signal lines SGL are electrically connected to the reference signal line Lvr. The power supply circuit 123 supplies a reference signal COM to the reference signal line Lvr. This causes the reference signal COM to be supplied to the capacitive elements Ca (see FIG. 7) included in the multiple partial detection areas PAA.

[0060] As shown in FIG. 7, the partial detection area PAA includes a photodiode PD, a capacitance element Ca, and a first switching element Tr. In FIG. 7, two gate lines GCL(m) and GCL(m+1) arranged in the second direction Dy are shown among the multiple gate lines GCL. Also shown are two signal lines SGL(n) and SGL(n+1) arranged in the first direction Dx among the multiple signal lines SGL. The partial detection area PAA is an area surrounded by the gate lines GCL and the signal lines SGL. The first switching element Tr is provided corresponding to the photodiode PD. The first switching element Tr is formed of a thin-film transistor, and in this example, is formed of an n-channel MOS (Metal Oxide Semiconductor) TFT (Thin Film Transistor).

[0061] The gates of the first switching elements Tr belonging to the partial detection areas PAA aligned in the first direction Dx are connected to the gate line GCL, the sources of the first switching elements Tr belonging to the partial detection areas PAA aligned in the second direction Dy are connected to the signal line SGL, and the drains of the first switching elements Tr are connected to the cathodes of the photodiodes PD and the capacitance elements Ca.

[0062] A sensor power supply signal VDDSNS is supplied to the anode of the photodiode PD from the power supply circuit 123. In addition, a reference signal COM, which becomes the initial potential of the signal line SGL and the capacitance element Ca, is supplied from the power supply circuit 123 to the signal line SGL and the capacitance element Ca.

[0063] When light is irradiated onto the partial detection area PAA, a current corresponding to the amount of light flows through the photodiode PD, causing charge to accumulate in the capacitance element Ca. When the first switching element Tr is turned on, a current corresponding to the charge accumulated in the capacitance element Ca flows through the signal line SGL. The signal line SGL is connected to the detection circuit 48 via the third switching element TrS of the signal line selection circuit 16. This allows the detection device 1 to detect a signal corresponding to the amount of light irradiated onto the photodiode PD for each partial detection area PAA or for each detection area group PAG1, PAG2.

[0064] During the readout period, the switch SSW of the detection circuit 48 is turned on, and the detection circuit 48 is connected to the signal line SGL. The detection signal amplifier circuit 42 of the detection circuit 48 converts fluctuations in current supplied from the signal line SGL into fluctuations in voltage and amplifies the voltage. A reference voltage Vref having a fixed potential is input to the non-inverting input terminal (+) of the detection signal amplifier circuit 42, and the signal line SGL is connected to the inverting input terminal (-). In this embodiment, a signal identical to the reference signal COM is input as the reference voltage Vref. The detection signal amplifier circuit 42 also has a capacitance element Cb and a reset switch RSW. During the reset period, the reset switch RSW is turned on, and the charge of the capacitance element Cb is reset.

[0065] With this configuration, the detection device 1 has multiple photodiodes PD, and is therefore able to detect information about the body of the finger Fg, such as the vein pattern, skin pattern, blood oxygen saturation, and pulse rate, and supply the detected information and other biometric information to the outside of the device.

[0066] Next, the power receiving element 410 and the battery 300 will be described. FIG. 8 is a diagram showing an example of the configuration of the power receiving element 410 and the battery 300. As shown in FIG. 8, the detection device 1 includes the power receiving element 410, a rectifier circuit 420, and a conversion circuit 430. The power receiving element 410 includes a planar coil 411. The coil 411 is a power receiving coil and is electrically connected to the rectifier circuit 420. The coil 411 is provided near the outer circumferential surface 220 in the first region 230 of the casing 200. When the coil 411 approaches the power transmitting coil 511 of the power supply device 500, the coil 411 is magnetically coupled to the power transmitting coil 511, receives an electromagnetic field from the power transmitting coil 511, and converts it into a current. The coil 411 may also function as an NFC (Near Field Communication) antenna to capture electromagnetic waves in space and absorb energy.

[0067] The power supply device 500 also includes a power supply element 510 capable of supplying power to the wireless power receiving element 410 of the detection device 1, and a power source 520 capable of supplying power to the power supply element 510. The power supply element 510 includes a power transmitting coil 511 for transmitting power to charge the battery 300. The power transmitting coil 511 and the power source 520 are electrically connected. The power transmitting coil 511 is a resonance type coil and operates using a drive voltage from the power source 520. The power source 520 is an AC power source. The power supply device 500 is a device that supplies power wirelessly by magnetically coupling the power transmitting coil 511 and a nearby power receiving element 410 on the power receiving side.

[0068] The coil 411 of the detection device 1 is electrically connected to the rectifier circuit 420. The rectifier circuit 420 is, for example, a rectifier circuit that rectifies the current received by the coil 411. The rectifier circuit 420 is electrically connected to the conversion circuit 430. The conversion circuit 430 is electrically connected to the battery 300, and the rectifier circuit 420 converts the rectified current into a direct current. When an alternating current flows through the power transmission coil 511 on the power transmission side of the detection device 1, an alternating current magnetic field is generated in the power transmission coil 511, and an alternating current is generated in the coil 411 that is closer to the alternating current magnetic field. The detection device 1 converts the generated alternating current into a direct current and charges the battery 300. In this way, the detection device 1 establishes wireless power supply by magnetic coupling.

[0069] The battery 300 is a secondary battery. The battery 300 is a chemical battery that can be repeatedly charged and discharged. The battery 300 includes, for example, a storage battery, a rechargeable battery, etc. The battery 300 is compatible with, for example, Qi (an international standard for wireless power supply). The battery 300 can supply stored power to each part of the detection device 30 that requires power. The battery 300 is electrically connected to the multiple light sources 60 and the optical sensors 10, and supplies power to the light sources 60, the optical sensors 10, etc.

[0070] Next, the functional configuration of the detection device 1 will be described. Fig. 9 is a configuration diagram showing an example of the functional configuration of the detection device 1 according to the first embodiment. As shown in Fig. 9, the detection device 1 includes the above-described optical sensor 10, the above-described plurality of light sources 60, a communication circuit 120, a memory circuit 130, and a control circuit 140. The control circuit 140 is electrically connected to the optical sensor 10, the plurality of light sources 60, the communication circuit 120, and the memory circuit 130. The control circuit 140 includes the above-described detection control circuit 11, detection circuit 40, etc.

[0071] The optical sensor 10 has a plurality of partial detection areas PAA arranged in a matrix in a detection area AA, and a photodiode PD is provided in each of the plurality of partial detection areas PAA. The optical sensor 10 supplies detection information that can identify the amount of light received by the plurality of photodiodes PD to the control circuit 140. The detection information includes, for example, information that indicates an image of the detection area AA based on the amount of light received by the plurality of photodiodes PD.

[0072] The light source 60 has a plurality of first light sources 61 and a plurality of second light sources 62. The light sources 60 are provided on the inner circumferential surface 210 side of the housing 200, which faces each other across the finger Fg. The light sources 60 are arranged such that the first light sources 61 emitting near-infrared light and the second light sources 62 emitting red light are alternately arranged, and are alternately turned on under the control of the control circuit 140. Note that the light source 60 may be arranged to emit only near-infrared light, and the perfusion index may be measured using only the near-infrared light.

[0073] The communication circuit 120 communicates wirelessly. The communication circuit 120 supports wireless communication standards. The communication standards include, for example, cellular phone communication standards such as 3G, 4G, and 5G, and short-range wireless communication standards. The communication circuit 120 supplies the received information to the control circuit 140. The communication circuit 120 transmits various pieces of information requested by the control circuit 140 to a destination.

[0074] The memory circuit 130 stores programs and data. The memory circuit 130 temporarily stores processing results of the control circuit 140. The memory circuit 130 includes a storage medium. The storage medium includes, for example, a read-only memory (ROM), a random access memory (RAM), a memory card, an optical disk, or a magneto-optical disk. The memory circuit 130 stores information that can identify the detection results detected by the optical sensor 10.

[0075] The memory circuitry 130 stores, for example, threshold information 131, perfusion index information 132, vein image D10, skin pattern image D20, and composite image D30. The threshold information 131 includes information such as a determination threshold for determining whether an acquired image is vein image D10 or skin pattern image D20 based on the perfusion index. The determination threshold is an example of a predetermined value. The perfusion index is an AC component / DC component obtained from a photoresponsive pulse wave obtained by alternately illuminating the first light source 61 and the second light source 62 with the finger Fg sandwiched therebetween to acquire a pulse wave. The perfusion index can be determined as blood oxygen saturation from the red / near-infrared ratio. The perfusion index information 132 is information indicating the perfusion index calculated by the control circuitry 140. The vein image D10 is image data that can identify the vein pattern of the finger Fg (living body) inserted into the through-hole of the housing 200, and is image data corresponding to the detection area AA. The dermatogram image D20 is image data that allows for identification of dermatograms and corresponds to the detection area AA. Dermatograms are patterns created by skin ridges found on the finger Fg, palm, etc. In this embodiment, the dermatogram image D20 is image data that shows the patterns and lines on the biological surface of the finger Fg. The composite image D30 is image data obtained by combining (mapping) the vein image D10 and the dermatogram image D20. The vein image D10, the dermatogram image D20, and the composite image D30 are examples of image data.

[0076] The control circuit 140 includes, for example, an MCU (Micro Control Unit), a CPU (Central Processing Unit), etc. The control circuit 140 comprehensively controls the operation of the detection device 1. The control circuit 140 has, for example, a function to control the lighting of the light source 60, a function to acquire an image detected by the optical sensor 10, a function to judge the acquired image, etc. The various functions of the control circuit 140 are realized by executing a program.

[0077] The control circuit 140 measures the perfusion index of the finger Fg based on image data acquired by the optical sensor 10 when the optical sensor 10 irradiates near-infrared light. The control circuit 140 determines that the image is a vein image D10 when the measured perfusion index is equal to or greater than a judgment threshold (predetermined value), and determines that the image is a skin pattern image D20 of the body surface when the measured perfusion index is less than the judgment threshold. The control circuit 140 associates the determined image with the judgment result and stores it in the memory circuit 130. The control circuit 140 maps the vein image D10 and the skin pattern image D20 to create a composite image D30. The control circuit 140 stores the created composite image D30 in the memory circuit 130. The control circuit 140 provides at least one of the vein image D10, the skin pattern image D20, and the composite image D30 to an external device via the communication circuit 120.

[0078] An example of the functional configuration of the detection device 1 according to this embodiment has been described above. Note that the configuration described above using Figures 1 to 9 is merely an example, and the functional configuration of the detection device 1 according to this embodiment is not limited to this example. The functional configuration of the detection device 1 according to this embodiment can be flexibly modified depending on the specifications and operation.

[0079] [Example of finger condition when wearing the detection device] Next, an example of a state when the detection device 1 is attached to a finger Fg will be described. Fig. 10 is a diagram for explaining a detection example of the detection device 1 when the finger Fg is in an extended state. Fig. 11 is a diagram for explaining a detection example of the detection device 1 when the finger Fg is in a bent state.

[0080] The extended state ST1 of the finger Fg is a state in which the finger Fg is extended, as shown in Fig. 10. The bent state ST2 of the finger Fg is a state in which the finger Fg is bent at an angle of 45° or more, as shown in Fig. 11. The inventors of the present application have realized the detection device 1 of this embodiment based on the discovery of the following phenomenon.

[0081] First, when the finger Fg is in the extended state ST1, blood flows all the way to the fingertip. When the finger Fg is in the bent state ST2, blood flow is stagnant. It was found that when blood flow in the finger Fg is stagnant in the bent state ST2, the pulse wave component of the image decreases, allowing for the acquisition of an image of the finger Fg in which skin patterns can be identified. Experiments also revealed that when blood flow in the finger Fg is stagnant, the perfusion index, which is the AC and DC components of the optical sensor 10 obtained from the pulse wave, decreases. That is, when the finger Fg is in the extended state ST1, the detection device 1 alternately turns on the first light source 61 and the second light source 62, allowing the optical sensor 10 to detect the pulse wave shown in graph G-1 of FIG. 10. When the finger Fg is in the bent state ST2, the detection device 1 alternately turns on the first light source 61 and the second light source 62, allowing the optical sensor 10 to detect the pulse wave shown in graph G-2 of FIG. 11. Graph G-2 has a waveform smaller than that of graph G-1. For this reason, the detection device 1 has the function of calculating a perfusion index from the detected pulse wave and determining whether the finger Fg is in an extended state ST1 or a flexed state ST2 based on the magnitude of the perfusion index. As a result, when the finger Fg is in the extended state ST1, the detection device 1 can obtain an image of the finger Fg in which veins are discernible because blood is flowing through the finger FG. When the finger Fg is in the flexed state ST2, the detection device 1 can obtain an image of the finger Fg in which skin patterns are discernible because blood flow is stagnant. Note that the first light source 61 and the second light source 62 may be arranged to emit only near-infrared light, and the perfusion index may be measured using only near-infrared light.

[0082] Furthermore, when measuring arterial blood oxygen saturation, it is desirable for the perfusion index to be 1.0% or higher. The average perfusion index at a fingertip is said to be approximately 2.0% to 10%, and it varies depending on the blood volume and circulatory state. A perfusion index below 1.0% indicates that the peripheral blood flow is worse than normal. In other words, a perfusion index below 1.0% indicates that the finger Fg is in a flexed state ST2. In this embodiment, the detection device 1 sets the threshold information 131 to 1.0% as the determination threshold for the perfusion index, but this is not limiting. The determination threshold for the perfusion index can be set to a threshold value obtained, for example, through machine learning, experiments, or the like, and can be set between 1.0% and 50%.

[0083] Furthermore, the inner diameter of the through-hole 201 in the housing 200 of the detection device 1 is several millimeters larger than the diameter (size) of the finger Fg so that the finger Fg wearing the detection device 1 can be switched between an extended state ST1 and a bent state ST2. As shown in Fig. 10, when the finger Fg is in the extended state ST1, the detection device 1 is preferably in a state where a gap is generated between the finger Fg and the housing 200. As shown in Fig. 11, when the finger Fg is in the bent state ST2, the detection device 1 is preferably in a state where the finger Fg is in contact with the housing 200.

[0084] [Example of processing procedure of the detection device according to embodiment 1] Next, the processing procedure of the detection device 1 attached to the finger Fg will be described. FIG. 12 is a flowchart showing an example of the processing procedure executed by the detection device 1 according to the first embodiment. FIG. 13 is a diagram for explaining an example of a vein image D10, a skin pattern image D20, and a composite image D30. The processing procedure shown in FIG. 12 is realized by the control circuit 140 of the detection device 1 executing a program. The detection device 1 repeatedly executes the processing procedure shown in FIG. 12 at the detection timing when the detection device 1 is attached to the finger Fg. The detection timing includes, for example, the time of authentication, a preset date and time, a time period, and when the device is attached to the finger Fg. It is also assumed that the person to be authenticated changes the finger Fg between an extended state ST1 and a flexed state ST2 at the detection timing.

[0085] 12, the detection device 1 alternately turns on the first light source 61 and the second light source 62 and acquires a pulse wave from the optical sensor 10 (step S101). For example, the detection device 1 acquires the AC component and the DC component of the pulse wave when the first light source 61 and the second light source 62 are alternately turned on. After completing the process of step S101, the detection device 1 proceeds to step S102.

[0086] The detecting device 1 calculates a perfusion index based on the acquired pulse wave (step S102). For example, the detecting device 1 calculates the AC component / DC component of the acquired pulse wave and stores the calculation result as a perfusion index in the perfusion index information 132 of the storage circuitry 130. After completing the process of step S102, the detecting device 1 proceeds to step S103.

[0087] The detection device 1 determines whether the perfusion index is equal to or greater than the determination threshold (step S103). For example, the detection device 1 compares the perfusion index with the determination threshold of the threshold information 131 and makes a determination based on the comparison result. If the detection device 1 determines that the perfusion index is equal to or greater than the determination threshold (Yes in step S103), it considers the finger Fg to be in the extended state ST1 and proceeds to step S104.

[0088] The detection device 1 determines that the image detected by the optical sensor 10 is a vein image D10 (step S104). For example, the detection device 1 determines that an image indicating two-dimensional information generated by the image processing circuit 49 by combining the detection signals Vdet output from the photodiodes PD of the optical sensor 10 is the vein image D10. The detection device 1 then stores the binarized vein image D10 in the storage circuit 130 (step S105). As a result, the detection device 1 can store the vein image D10 in which the detected vein Fg10 can be identified in the storage circuit 130, as shown in FIG. 13. Returning to FIG. 12, when the detection device 1 completes the process of step S105, the process proceeds to step S108, which will be described later.

[0089] On the other hand, if the detection device 1 determines that the perfusion index is not equal to or greater than the determination threshold, i.e., that the perfusion index is smaller than the determination threshold (No in step S103), it considers the finger Fg to be in the flexed state ST2, and proceeds to step S106. The detection device 1 determines the image detected by the optical sensor 10 as a dermatogram image D20 (step S106). For example, the detection device 1 determines that an image representing two-dimensional information generated by the image processing circuit 49 by combining the detection signals Vdet output from the photodiodes PD of the optical sensor 10 is the dermatogram image D20. The detection device 1 then stores the binarized dermatogram image D20 in the storage circuit 130 (step S107). As a result, the detection device 1 can store the dermatogram image D20, which allows the detected dermatogram Fg20 to be identified, in the storage circuit 130, as shown in FIG. 13. Returning to FIG. 12, when the process of step S107 is completed, the detecting device 1 advances the process to step S108.

[0090] The detection device 1 determines whether the vein image D10 and the skin pattern image D20 have been acquired (step S108). For example, the detection device 1 determines that the vein image D10 and the skin pattern image D20 have been acquired if the vein image D10 and the skin pattern image D20 that can be associated are stored in the storage circuitry 130. If the detection device 1 determines that the vein image D10 and the skin pattern image D20 have not been acquired (No in step S108), the detection device 1 returns to step S101, which has already been described, to acquire the missing images, and continues the process. If the detection device 1 determines that the vein image D10 and the skin pattern image D20 have been acquired (Yes in step S108), the process proceeds to step S109.

[0091] The detection device 1 maps the vein image D10 and the skin pattern image D20 (step S109). For example, the detection device 1 associates the veins FG10 indicated by the vein image D10 with the skin pattern Fg20 indicated by the skin pattern image D20 in the detection area AA. The detection device 1 then stores the mapped composite image D30 in the storage circuitry 130 (step S110). For example, the detection device 1 associates the composite image D30 with the vein image D10 and the skin pattern image D20 and stores them in the storage circuitry 130. This allows the detection device 1 to store the composite image D30 in which the veins Fg10 and the skin pattern Fg20 can be identified in the storage circuitry 130, as shown in FIG. 13. Returning to FIG. 12, when the detection device 1 completes the process of step S110, it ends the processing procedure shown in FIG. 12.

[0092] 12 includes, but is not limited to, steps S105 and S107 for binarizing the image. In the processing procedure shown in FIG. 12, steps S105 and S107 may be modified so that the image is stored in the storage circuitry 130 without being binarized.

[0093] As described above, the detection device 1 measures the blood perfusion index based on the image acquired by the optical sensor 10 when irradiated with near-infrared light. If the perfusion index is equal to or greater than the threshold, the detection device 1 determines the image as a vein image D10. If the perfusion index is smaller than the threshold, the detection device 1 determines the image as a skin pattern image D20. Thus, while the detection device 1 is attached to a finger Fg, the detection device 1 can distinguish between the vein image D10 and the skin pattern image D20 simply by changing the state of the finger Fg. As a result, the detection device 1, which is small and lightweight with its ring-shaped (finger ring-shaped) housing 200, can be worn at all times and can detect multiple different types of images. Furthermore, the detection device 1 can detect multiple types of biometric images simply by changing the finger Fg between the extended state ST1 and the bent state ST2, without causing any inconvenience to the person to be authenticated. Furthermore, since the relationship between the vein image D10 and the skin pattern image D20 in the mapping example differs for each individual, even if there are unclear points in the signals, the detection device 1 can identify them from the positional relationship between the vein image D10 and the skin pattern image D20.

[0094] The detecting device 1 further includes a second light source 62 that emits red light. The detecting device 1 measures a perfusion index based on an image detected by the optical sensor 10 when the control circuit 140 alternately emits red light and near-infrared light using the optical sensor 10, and determines that the image is a vein image D10 when the perfusion index is equal to or greater than a determination threshold, and determines that the image is a skin pattern image D20 of the surface of a living body when the perfusion index is less than the determination threshold. This allows the detecting device 1 to obtain images corresponding to the irradiation of red light and near-infrared light, thereby detecting different images and determining blood oxygen saturation from the ratio of near-infrared light to red light.

[0095] Furthermore, since the detection device 1 can be wirelessly charged while being worn, it is possible to prevent power shortages in the battery 300 even when detected images and the like are transmitted to an external device. This allows the detection device 1 to have the housing 200 worn for a long period of time, improving convenience.

[0096] (Embodiment 2) Next, a description will be given of the functional configuration of the detection device 1A according to embodiment 2. Fig. 14 is a configuration diagram showing an example of the functional configuration of the detection device 1A according to embodiment 2. Fig. 15 is a cross-sectional schematic diagram of the detection device 1A according to embodiment 2.

[0097] 14, the detection device 1A includes the above-described optical sensor 10, a plurality of light sources 60, a communication circuit 120, a memory circuit 130, a control circuit 140, and a pressure sensor 150. That is, the detection device 1A has a configuration in which the pressure sensor 150 is added to the detection device 1 according to the first embodiment. The pressure sensor 150 is electrically connected to the control circuit 140. The detection device 1A has the same basic configuration as the detection device 1, and therefore, only the different configurations will be described below.

[0098] As shown in FIG. 15 , the pressure sensor 150 is provided on the housing 200 so as to come into contact with the finger Fg wearing the housing 200 at least when the finger Fg is in the bent state ST2. In this embodiment, the detection device 1A will be described as having the pressure sensor 150 provided near the optical sensor 10 of the housing 200, which is in contact with the finger pad Fg-1 of the finger Fg. However, this is not limited to this. The detection device 1A may have the pressure sensor 150 provided at a location where the finger Fg comes into contact when the finger Fg is in the bent state ST2, or at a location where the pressure value changes between the extended state ST1 and the bent state ST2 of the finger Fg. The pressure sensor 150 supplies pressure information indicating the pressure corresponding to the contact state with the finger Fg to the control circuit 140. When the finger Fg comes into contact in the bent state ST2, the pressure value changes to a value greater than that in the extended state ST1. Note that the pressure sensor 150 may be, for example, a pressure switch composed of a sensor and an electronic switch.

[0099] 14, the threshold information 131 of the memory circuit 130 includes information such as a pressure threshold for determining whether the finger Fg is in the extended state ST1 or the bent state ST2. The pressure threshold may be set to a value obtained by calibration using the finger Fg attached to the housing 200, or may be set to a value obtained according to the size of the finger Fg using machine learning, simulation, or the like. For example, when the pressure threshold is equal to or less than the pressure threshold, the finger Fg is in the extended state ST1, and when the pressure threshold is greater than the pressure threshold, the finger Fg is in the bent state ST2.

[0100] When near-infrared light is irradiated, the control circuit 140 determines that the image is a vein image D10 when the pressure value of the pressure sensor 150 is equal to or less than the pressure threshold, and determines that the image is a skin pattern image D20 of the surface of the living body when the pressure value is greater than the pressure threshold. The control circuit 140 stores the determined image in the memory circuit 130 in association with the determination result, pressure information, etc.

[0101] An example of the functional configuration of the detection device 1A according to this embodiment has been described above. Note that the configuration described above using Figures 14 and 15 is merely an example, and the functional configuration of the detection device 1A according to this embodiment is not limited to this example. The functional configuration of the detection device 1A according to this embodiment can be flexibly modified according to specifications and operation.

[0102] [Example of processing procedure of the detection device according to the second embodiment] Next, the processing procedure of the detection device 1A attached to the finger Fg will be described. FIG. 16 is a flowchart showing an example of the processing procedure executed by the detection device 1A according to the second embodiment. The processing procedure shown in FIG. 16 is realized by the control circuit 140 of the detection device 1A executing a program. The detection device 1A repeatedly executes the processing procedure shown in FIG. 16, for example, at the detection timing when the detection device 1A is attached to the finger Fg. Note that the processing procedures of the following step S101 and steps S104 to S110 are the same as the processing procedures of step S101 and steps S104 to S110 shown in FIG. 12, and therefore the description will be simplified.

[0103] 16, the detection device 1A alternately turns on the first light source 61 and the second light source 62 and acquires a pulse wave from the optical sensor 10 (step S101). Note that the detection device 1A may turn on only the infrared light. After completing the process of step S101, the detection device 1A proceeds to step S111.

[0104] The detection device 1A acquires pressure information from the pressure sensor 150 (step S111). Then, the detection device 1A determines whether the value (pressure) of the pressure sensor 150 is equal to or less than the pressure threshold value (step S112). For example, the detection device 1A compares the pressure value with the pressure threshold value of the threshold value information 131 and makes a determination based on the comparison result. If the detection device 1A determines that the value of the pressure sensor 150 is equal to or less than the pressure threshold value (Yes in step S112), it considers that the finger Fg is in the extended state ST1 and proceeds to step S104.

[0105] The detection device 1A determines that the image detected by the optical sensor 10 is a vein image D10 (step S104). Then, the detection device 1A stores the binarized vein image D10 in the storage circuitry 130 (step S105). This allows the detection device 1A to store the vein image D10 in which the detected vein Fg10 can be identified in the storage circuitry 130. When the process of step S105 is completed, the detection device 1A proceeds to step S108, which will be described later.

[0106] Furthermore, if the detection device 1A determines that the value of the pressure sensor 150 is not equal to or less than the pressure threshold, i.e., that the value of the pressure sensor 150 is greater than the pressure threshold (No in step S112), it considers the finger Fg to be in the bent state ST2 and proceeds to step S106. The detection device 1A determines that the image detected by the optical sensor 10 is a dermatogram image D20 (step S106). The detection device 1A then stores the binarized dermatogram image D20 in the storage circuitry 130 (step S107). This allows the detection device 1A to store the dermatogram image D20, which allows the detected dermatogram Fg20 to be identified, in the storage circuitry 130. After completing step S107, the detection device 1A proceeds to step S108.

[0107] The detection device 1A determines whether the vein image D10 and the skin pattern image D20 have been acquired (step S108). If the detection device 1A determines that the vein image D10 and the skin pattern image D20 have not been acquired (No in step S108), the process returns to step S101, which has already been described, to acquire the missing images, and continues the process. If the detection device 1A determines that the vein image D10 and the skin pattern image D20 have been acquired (Yes in step S108), the process proceeds to step S109.

[0108] The detection device 1A maps the vein image D10 and the skin pattern image D20 (step S109). Then, the detection device 1A stores the mapped composite image D30 in the storage circuitry 130 (step S110). This allows the detection device 1A to store the composite image D30 in which the veins Fg10 and the skin pattern Fg20 can be identified in the storage circuitry 130. When the process of step S110 is completed, the detection device 1A ends the processing procedure shown in FIG. 16.

[0109] As described above, when irradiated with near-infrared light, the detection device 1A determines the image acquired by the optical sensor 10 as a vein image D10 when the pressure value of the pressure sensor 150 is equal to or less than the pressure threshold, and as a skin pattern image D20 when the pressure value is greater than the pressure threshold. As a result, the detection device 1A can distinguish between the vein image D10 and the skin pattern image D20 while attached to the finger Fg by simply changing the state of the finger Fg. Furthermore, since the detection device 1A can be wirelessly charged while attached, power shortages in the battery 300 can be reduced even when detected images are transmitted to an external device. As a result, the detection device 1A can be worn at all times and can detect multiple different types of images. Furthermore, the detection device 1A can detect multiple types of biometric images simply by changing the finger Fg between the extended state ST1 and the bent state ST2, without causing any inconvenience to the person to be authenticated. Furthermore, since the relationship between the vein image D10 and the skin pattern image D20 in the mapping example differs for each individual, the detection device 1A can identify the relationship from the positional relationship between the vein image D10 and the skin pattern image D20 even if there are unclear points in the signals.

[0110] Furthermore, the detection device 1A can determine whether the finger Fg is in an extended state ST1 or a flexed state ST2 by combining the perfusion index and the pressure value described above. For example, when the perfusion index is equal to or greater than the determination threshold and the pressure value is equal to or less than the pressure threshold, the detection device 1A determines that the finger Fg is in an extended state ST1 and determines the image at that time as a vein image D10. When the perfusion index is smaller than the determination threshold and the pressure value is greater than the pressure threshold, the detection device 1A determines that the finger Fg is in a flexed state ST2 and determines the image at that time as a skin pattern image D20. In this way, the detection device 1 can improve the accuracy of the determination by distinguishing images based on the perfusion index and the pressure value of the pressure sensor 150.

[0111] In the above-described embodiments, the detection device 1, 1A is described as including the first light source 61 and the second light source 62, but may be configured to include only the first light source 61. The detection device 1, 1A may be a wristband. In this case, the detection device 1, 1A may be configured to distinguish between images of an extended wrist and an image of an extended wrist.

[0112] The components of each of the above-described embodiments can be combined as appropriate. Furthermore, other effects and advantages brought about by the aspects described in the present embodiments that are obvious from the description in this specification or that can be conceived by a person skilled in the art are naturally understood to be brought about by the present invention. [Explanation of symbols]

[0113] 1,1A detection device 10. Optical Sensor 21 Sensor board 60 light source 61 1st light source 62 Second light source 120 Communication Circuit 130 Memory circuit 131 Threshold Information 132 Perfusion index information 140 Control circuit 150 Pressure Sensor 200 cabinets 201 Through hole 210 Inner surface 220 Outer surface 230 1st area 240 Second area 300 battery 410 receiving element 411 Coil 420 Rectifier circuit 430 Conversion Circuit 500 Power Supply Device 510 Feed element 511 Transmission coil 520 power supply D10 Vein image D20 skin pattern image D30 composite image Fg finger Fg10 vein Fg20 Skin pattern

Claims

1. a ring-shaped housing that can be attached to a living body; a first light source provided inside the housing and configured to emit near-infrared light; an optical sensor capable of detecting the near-infrared light; a control circuit for controlling the lighting of the first light source; Equipped with The control circuit measures a perfusion index of blood flow based on image data acquired by the optical sensor when the near-infrared light is irradiated, and determines the image data as a vein image when the perfusion index is equal to or greater than a predetermined value, and determines the image data as a skin pattern image of the surface of a living body when the perfusion index is smaller than the predetermined value. Detection device.

2. a ring-shaped housing that can be attached to a living body; a first light source provided inside the housing and configured to emit near-infrared light; an optical sensor capable of detecting the near-infrared light; a pressure sensor capable of detecting different pressure states of an object inserted into the through-hole of the housing; a control circuit for controlling the lighting of the first light source; Equipped with When the near-infrared light is irradiated, the control circuit determines that the image data acquired by the optical sensor is a vein image when the value of the pressure sensor is equal to or less than a pressure threshold, and determines that the image data is a skin pattern image of the surface of a living body when the value of the pressure sensor is greater than the pressure threshold. Detection device.

3. The control circuit measures a perfusion index of blood flow based on image data acquired by the optical sensor when the optical sensor irradiates the near-infrared light, and determines the image data as a vein image when the perfusion index is equal to or greater than a predetermined value, and determines the image data as a skin pattern image of the surface of a living body when the perfusion index is smaller than the predetermined value. The detection device according to claim 2 .

4. Further provided is a second light source that emits red light; The control circuit measures the perfusion index based on image data detected by the optical sensor when the red light and the near-infrared light are alternately irradiated, and determines the image data as a vein image when the perfusion index is equal to or greater than a predetermined value, and determines the image data as a skin pattern image of the surface of a living body when the perfusion index is smaller than the predetermined value.

4. The detection device according to claim 1 or 3.

5. The first light sources and the second light sources are alternately arranged. The detection device according to claim 4.

6. The predetermined value is set in the range of 1% to 50%.

4. The detection device according to claim 1 or 3.

7. The housing is a ring.

3. The detection device according to claim 1 or 2.

8. The control circuit stores a composite image obtained by mapping the vein image and the skin pattern image in a storage circuit.

3. The detection device according to claim 1 or 2.

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