Detection device

Abstract

To provide a detection device that can accurately detect both veins and pulse waves. [Solution] The detection device comprises a housing, a first optical sensor for detecting veins of the object to be detected, and a second optical sensor for detecting pulse waves of the object to be detected. The housing has a first mounting surface at a position facing the object to be detected and a second mounting surface at a position facing the object to be detected but different from the first mounting surface. The first optical sensor is positioned on the first mounting surface, and the second optical sensor is positioned on the second mounting surface. The position of the second mounting surface is closer to the object to be detected housed in the housing than the position of the first mounting surface.

Description

Technical Field

[0001] The present disclosure relates to a detection device.

Background Art

[0002] Optical sensors capable of detecting fingerprint patterns and vein patterns are known (for example, Patent Document 1). Such optical sensors are incorporated into wearable devices such as smartwatches, wristwatches, and wristbands, and are used to acquire biological information such as pulse waves.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, the same optical sensor can detect veins and pulse waves. However, the contact load (the pressure received from the finger to the optical sensor) that can detect veins well and the contact load that can detect pulse waves well are different. Therefore, there is a possibility that veins can be detected but pulse waves cannot be detected, or that pulse waves can be detected but veins cannot be detected.

[0005] An object of the present disclosure is to provide a detection device that can detect both veins and pulse waves well.

Means for Solving the Problems

[0006] A detection device according to one aspect of the present disclosure comprises a housing, a first optical sensor for detecting veins, and a second optical sensor for detecting pulse waves, wherein the housing has a first mounting surface and a second mounting surface at different positions facing the object to be detected housed in the housing, the first optical sensor is positioned on the first mounting surface, and the second optical sensor is positioned on the second mounting surface, the position of the second mounting surface is closer to the object to be detected housed in the housing than the position of the first mounting surface. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a schematic diagram showing an example of the external appearance of the detection device according to Embodiment 1, when a finger is placed inside the device and viewed from the side of the housing. [Figure 2] Figure 2 is a cross-sectional view taken along line II-II' in Figure 1. [Figure 3] Figure 3 is a schematic plan view showing the optical sensor according to Embodiment 1. [Figure 4] Figure 4 is a block diagram showing the optical sensor according to Embodiment 1. [Figure 5] Figure 5 is a circuit diagram showing the optical sensor according to the first embodiment. [Figure 6] Figure 6 is a cross-sectional view taken along line VI-VI' in Figure 2. [Figure 7] Figure 7 is a schematic diagram showing an example of the external appearance of the detection device according to Embodiment 2, when a finger is placed inside the device and viewed from the side of the housing. [Figure 8] Figure 8 is a plan view of the detection device according to Embodiment 2. [Modes for carrying out the invention]

[0008] The embodiments for implementing this disclosure will be described in detail with reference to the drawings. This disclosure is not limited to the embodiments described below. Furthermore, the components described below include those that can be easily conceived by a person skilled in the art, and those that are substantially the same. In addition, the components described below can be combined as appropriate. The disclosure is merely an example, and any modifications that a person skilled in the art can easily conceive while maintaining the spirit of this disclosure are naturally included within the scope of this disclosure. Furthermore, in order to make the explanation clearer, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the actual embodiment, but these are merely examples and do not limit the interpretation of this disclosure. Furthermore, in this disclosure and in each drawing, elements similar to those described above with respect to previously shown drawings are denoted by the same reference numerals, and detailed explanations may be omitted as appropriate.

[0009] In this disclosure, when describing a manner in which one structure is placed on top of another structure, unless otherwise specified, the term "on top of" includes both cases: when one structure is placed directly on top of another structure so as to be in contact with it, and when another structure is placed above another structure via yet another structure.

[0010] (Embodiment 1) Figure 1 is a schematic diagram showing an example of the external appearance of the detection device according to Embodiment 1, when a finger is placed inside the device and viewed from the side of the housing. Figure 2 is a cross-sectional view taken along line II-II' in Figure 1. Figure 3 is a schematic plan view showing the optical sensor according to Embodiment 1. As shown in Figures 1 and 2, the detection device 1 according to the embodiment is a cylindrical device that can be attached to and removed from the human body, which is the object to be detected. The detection device 1 measures the biological information of the object to be detected.

[0011] As shown in Figure 1, the detection device 1 comprises a housing 100. For example, the detection device 1 is attached to the finger Fg of the object to be detected by inserting the finger Fg into the housing portion 80, which is the hollow part of the housing 100. The finger Fg includes the thumb, index finger, middle finger, ring finger, little finger, etc. The detection device 1 can detect biological information from the attached finger Fg. The finger Fg is an example of the object to be detected. The object to be detected is the human body or a part of the human body. Biological information includes, for example, pulse wave, pulse rate, vascular image, etc.

[0012] In the following explanation, the first direction Dx is the direction in which the finger Fg of the object to be detected is inserted into the housing 100. The second direction Dy is perpendicular to the first direction Dx. The second direction Dy may intersect the first direction Dx without being perpendicular to it. The third direction Dz is perpendicular to both the first direction Dx and the second direction Dy. Furthermore, "plan view" refers to the positional relationship when viewed from a direction parallel to the third direction Dz.

[0013] The housing 100 is equipped with an optical sensor 30 on its inner surface 110. The housing 100 is also equipped with a light source 60 and an optical filter layer 50 on its inner surface 110. The inner surface 110 of the housing 100 in Embodiment 1 is a cylindrical inner surface.

[0014] The optical sensor 30 includes a first optical sensor 10A and a second optical sensor 10B. The first optical sensor 10A detects the vein of finger Fg, and the second optical sensor 10B detects the pulse wave of finger Fg.

[0015] The housing 100 is a mounting member into which the finger Fg is attached in the housing 80. The housing 100 is formed in a cylindrical (annular) shape from a material such as metal or an impermeable synthetic resin. However, the housing 100 may be composed of a combination of multiple materials, such as a permeable resin material and a metal material.

[0016] The housing 100 has a first mounting surface 101 on its inner surface 110, which is positioned opposite to the finger Fg, and a second mounting surface 102, which is positioned opposite to the finger Fg but at a different position from the first mounting surface 101.

[0017] A step 103 is provided between the first mounting surface 101 and the second mounting surface 102. As a result, the position of the second mounting surface 102 is higher than the position of the first mounting surface 101. Consequently, the position of the second mounting surface 102 is closer to the finger Fg than the first mounting surface 101.

[0018] The first optical sensor 10A is disposed on the first mounting surface 101, and the second optical sensor 10B is disposed on the second mounting surface 102. Also, the position of the second mounting surface 102 is arranged to be closer to the finger Fg, which is the detected object to be accommodated in the housing 100, than the position of the first mounting surface 101.

[0019] The housing 100 has a recess 111 provided so as to surround the first optical sensor 10A and a convex portion 112 protruding toward the finger Fg, which is the detected object. The first mounting surface 101 is disposed on the bottom surface of the recess 111, and the second mounting surface 102 is disposed on the top of the convex portion 112.

[0020] The optical filter layer 50 is disposed above the first optical sensor 10A. The optical filter layer 50 is also called a collimating aperture or a collimator. Note that the optical filter layer 50 may be a louver or a microlens. The optical filter layer 50 reduces the noise included in the detection value detected by the first optical sensor 10A by limiting the angular range of the light passing through. Note that the optical filter layer 50 may be disposed above the second optical sensor 10B according to the detection sensitivity.

[0021] The housing 100 has a pressing device 70 at a position sandwiching the finger Fg, which is the detected object, with respect to the first optical sensor 10A. Similarly, the second optical sensor 10B and the pressing device 70 sandwich the finger Fg, which is the detected object. The pressing device 70 presses the finger Fg against the first optical sensor 10A or the second optical sensor 10B by pushing the finger Fg.

[0022] An opening OP is provided in a part of the housing 100. The opening OP is a slit that extends along the first direction Dx of the housing 100. When the pressurizing device 70 expands, the ceiling portion of the housing 100, which has become movable at the opening OP, generates a reaction force that pushes the pressurizing device 70 back towards finger Fg.

[0023] The pressurizing device 70 has an elastic body that contains gas and changes size according to the gas pressure of the gas. The elastic body is bag-shaped and made of natural rubber or elastomer, into which a pipe is inserted. The pressurizing device 70 is connected to a pump on the control device 200 via a pipe inserted into the opening OP. The pressurizing device 70 drives the pump according to the control of the control device 200, and the gas pressure inside the elastic body can be changed. As a result, the pressurizing device 70 can vary the pressing force applied to finger Fg.

[0024] The control device 200 is a device that controls the pressurizing or depressurizing operation of the pressurizing device 70. By applying pressure to the pressurizing device 70, the control device 200 can cause the pressurizing device 70 to press against the finger Fg and bring it into close contact with the first optical sensor 10A and the second optical sensor 10B. In this case, the first optical sensor 10A is subjected to a pressing force per unit area such that it touches the finger Fg but does not exert a contact load. The second optical sensor 10B is subjected to a pressing force per unit area greater than that applied from the finger Fg to the first optical sensor 10A.

[0025] As a result, the pressure device 70 changes the load on finger Fg, which in turn changes the pressing force that finger Fg exerts against the first optical sensor 10A and the second optical sensor 10B.

[0026] Furthermore, the control device 200 is equipped with a display device 210. The display device 210 displays biological information such as veins and pulse waves, allowing the observer to monitor it.

[0027] The following explanation will describe the case where the light sensor 30 is the first light sensor 10A. The second light sensor 10B is the same as the first light sensor 10A, so its explanation will be omitted.

[0028] As shown in Figure 3, the optical sensor 30 includes an array substrate 2 (substrate 21), sensor pixels PX, a scanning line driving circuit 15, a signal line selection circuit 16, and a detection circuit 40.

[0029] The control device 200 is electrically connected to the substrate 21 via the wiring board 510. The wiring board 510 is, for example, a flexible printed circuit board or a rigid circuit board. The wiring board 510 is provided with a detection circuit 40. The third direction Dz is the normal direction of the substrate 21.

[0030] The control device 200 is, for example, an FPGA (Field Programmable Gate Array). The control device 200 supplies control signals to the scan line drive circuit 15 and the signal line selection circuit 16 to control the detection operation of multiple sensor pixels PX.

[0031] The detection circuit 40 supplies voltage signals such as the sensor power supply potential VDDSNS (see Figure 5) to the scan line drive circuit 15 and the signal line selection circuit 16. In Embodiment 1, the detection circuit 40 is shown as being located on the wiring board 510, but it is not limited to this. The detection circuit 40 may also be located on the board 21.

[0032] The substrate 21 has a detection region AA and a peripheral region GA. The detection region AA is the region where multiple photodiodes PD are provided. The peripheral region GA is the region outside the detection region AA and is the region where multiple photodiodes PD are not provided. In other words, the peripheral region GA is the region between the outer periphery of the detection region AA and the outer edge of the substrate 21.

[0033] The photodiode PD is an organic photodiode (OPD) using an organic semiconductor. The second light sensor 10B may be a PIN (Positive Intrinsic Negative) photodiode using an inorganic semiconductor such as silicon.

[0034] Each of the multiple sensor pixels PX is a light sensor 30 having a photodiode PD as a sensor element. Each photodiode PD outputs an electrical signal corresponding to the light irradiated upon it. The multiple sensor pixels PX are arranged in a matrix in the detection area AA. The multiple photodiodes PD perform detection according to the gate drive signals supplied from the scan line drive circuit 15. Each of the multiple photodiodes PD outputs an electrical signal corresponding to the light irradiated upon it as a detection signal Vdet to the signal line selection circuit 16. The light sensor 30 detects biological information based on the detection signals Vdet from the multiple photodiodes PD.

[0035] The scan line driving circuit 15 and the signal line selection circuit 16 are provided in the peripheral region GA. Specifically, the scan line driving circuit 15 is provided in the region of the peripheral region GA that extends along the second direction Dy. The signal line selection circuit 16 is provided in the region of the peripheral region GA that extends along the first direction Dx.

[0036] Figure 4 is a block diagram showing an optical sensor according to Embodiment 1. The detection circuit 40 comprises a detection control circuit 11, a signal processing circuit 44, a coordinate extraction circuit 45, a memory circuit 46, a detection timing control circuit 47, and an analog front end circuit (AFE) 48.

[0037] The detection control circuit 11 supplies control signals to the scan line drive circuit 15, the signal line selection circuit 16, and the detection timing control circuit 47, respectively, and controls their operation. The detection control circuit 11 supplies various control signals, such as the start signal STV and the clock signal CK, to the scan line drive circuit 15. The detection control circuit 11 also supplies various control signals, such as the selection signal ASW, to the signal line selection circuit 16.

[0038] The scan line drive circuit 15 is a circuit that drives multiple scan lines GL (see Figure 5) based on various control signals. The scan line drive circuit 15 sequentially or simultaneously selects multiple scan lines GL and supplies a gate drive signal VGL to the selected scan lines GL. As a result, the scan line drive circuit 15 selects multiple photodiodes PD connected to the scan lines GL.

[0039] The signal line selection circuit 16 is a switch circuit that sequentially or simultaneously selects multiple signal lines SL (see Figure 5). The signal line selection circuit 16 is, for example, a multiplexer. Based on the selection signal ASW supplied from the detection control circuit 11, the signal line selection circuit 16 connects the selected output signal line SL to the detection circuit 40. As a result, the signal line selection circuit 16 outputs the detection signal Vdet of the photodiode PD to the detection circuit 40.

[0040] The detection timing control circuit 47 controls the detection circuit 40, the signal processing circuit 44, and the coordinate extraction circuit 45 to operate synchronously based on the control signal supplied from the detection control circuit 11.

[0041] The analog front-end circuit 48 is a signal processing circuit having at least the functions of a detection signal amplification circuit 42 and an A / D conversion circuit 43. The detection signal amplification circuit 42 is a circuit that amplifies the detection signal Vdet, and is, for example, an integrator circuit. The A / D conversion circuit 43 converts the analog signal output from the detection signal amplification circuit 42 into a digital signal.

[0042] The signal processing circuit 44 is a logic circuit that detects predetermined physical quantities input to each of the multiple sensor pixels PX based on the output signal of the detection circuit 40. When a finger Fg is in contact with or near the sensor, the signal processing circuit 44 can detect information based on the light reflected by the finger Fg based on the signal from the detection circuit 40. The signal processing circuit 44 can also extract other biological information, such as pulse wave, pulse rate, and blood oxygen saturation, based on the signal from the detection circuit 40.

[0043] 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.

[0044] The coordinate extraction circuit 45 is a logic circuit that determines the detected coordinates of finger Fg (for example, the detected position of blood vessels in the palm or wrist) when contact or proximity of finger Fg is detected in the signal processing circuit 44. The coordinate extraction circuit 45 combines the detection signals Vdet output from each sensor pixel PX to generate two-dimensional information showing the shape of the surface irregularities of the skin and the blood vessel image. Alternatively, the coordinate extraction circuit 45 may output the detection signal Vdet as the sensor output Vo without calculating the detected coordinates.

[0045] Some or all of the functions of the detection control circuit 11 may be included in the control device 200. Also, some or all of the functions of the detection circuit 40 may be included in the control device 200.

[0046] Figure 5 is a circuit diagram showing the optical sensor according to the first embodiment. Figure 5 also shows the circuit configuration of the detection circuit 40. As shown in Figure 5, the sensor pixel PX includes a photodiode PD, a capacitive element Ca, and a drive transistor Tr. The capacitive element Ca is the capacitance (sensor capacitance) formed on the photodiode PD and is equivalently connected in parallel with the photodiode PD.

[0047] Figure 5 shows two scan lines GL(m) and GL(m+1) aligned in the second direction Dy, among multiple scan lines GL. It also shows two signal lines SL(n) and SL(n+1) aligned in the first direction Dx, among multiple signal lines SL. The sensor pixel PX is the region enclosed by the scan lines GL and the signal lines SL.

[0048] A drive transistor Tr is provided corresponding to each of the multiple photodiodes PD. The drive transistor Tr is composed of a thin-film transistor, and in this example, it is composed of an n-channel MOS (Metal Oxide Semiconductor) type TFT (Thin Film Transistor).

[0049] Each of the multiple scan lines GL is connected to the gate of a plurality of drive transistors Tr arranged in the first direction Dx. Each of the multiple signal lines SL is connected to one of the source and drain of a plurality of drive transistors Tr arranged in the second direction Dy. The other of the source and drain of the plurality of drive transistors Tr is connected to the anode and capacitive element Ca of the photodiode PD.

[0050] The cathode of the photodiode PD is supplied with a sensor power supply signal VDDSNS from the detection circuit 40. In addition, the signal line SL and the capacitive element Ca are supplied with a sensor reference voltage COM, which is the initial potential of the signal line SL and the capacitive element Ca, from the detection circuit 40 via the reset transistor TrR.

[0051] During the exposure period, when light is shone onto the sensor pixel PX, a current flows through the photodiode PD in proportion to the amount of light, causing charge to accumulate in the capacitive element Ca. During the readout period, when the drive transistor Tr is turned on, a current flows through the signal line SL in proportion to the charge accumulated in the capacitive element Ca. The signal line SL is connected to the detection circuit 40 via the output transistor TrS of the signal line selection circuit 16. As a result, the detection device 1 can detect a signal corresponding to the amount of light shone onto the photodiode PD for each sensor pixel PX.

[0052] The detection circuit 40 is connected to the signal line SL when the switch SSW is turned on during the readout period. The detection signal amplification circuit 42 of the detection circuit 40 converts the current or charge supplied from the signal line SL into a voltage. A reference potential (Vref) with a fixed potential is input to the non-inverting input (+) of the detection signal amplification circuit 42, and the signal line SL is connected to the inverting input (-). In this embodiment, the same signal as the sensor reference voltage COM is input as the reference potential (Vref) voltage. The detection circuit 40 calculates the difference between the detection signal Vdet when light is irradiated and the detection signal Vdet when light is not irradiated as the sensor output Vo. The detection signal amplification circuit 42 also has a capacitive element Cb and a reset switch RSW. During the reset period, the reset switch RSW is turned on, and the charge of the capacitive element Cb is reset.

[0053] The first light sensor 10A shown in Figure 2 has multiple photodiodes PD arranged along the first mounting surface 101, as shown in Figure 3. The number of pixels is, for example, 126 × 260.

[0054] The second optical sensor 10B shown in Figure 2 has at least one photodiode PD. The number of pixels of the second optical sensor 10B may be the same as the number of pixels of the first optical sensor 10A, or it may be fewer than the number of pixels of the first optical sensor 10A. To measure pulse waves, the second optical sensor 10B only needs to have at least one pixel.

[0055] Note that the drive transistor Tr is not limited to an n-type TFT, but may be composed of a p-type TFT. Also, the pixel circuit of the sensor pixel PX shown in Figure 3 is merely an example, and the sensor pixel PX may be provided with multiple transistors corresponding to one photodiode PD. If the second light sensor 10B differs from the first light sensor 10A in that it has only one sensor pixel, the scan line drive circuit 15, the signal line selection circuit 16, the multiple scan lines GL, and the multiple signal lines SL become unnecessary.

[0056] Figure 6 is a cross-sectional view taken along line VI-VI' in Figure 2. In Figure 6, the housing 100 extends in a first direction Dx and has a housing portion 80 parallel to the first direction Dx. The housing portion 80 is capable of accommodating a part of the object to be detected, for example, a finger Fg.

[0057] In a plan view, the longitudinal direction of the first light sensor 10A extends in the first direction Dx. Two first light sensors 10A are arranged adjacent to each other in the first direction Dx, and one light filter layer 50 is provided on top of the two first light sensors 10A.

[0058] Of the multiple first light sensors 10A, one first light sensor 10A and the other first light sensor 10A are positioned to avoid the first joint of the finger Fg, and the other first light sensor 10A is positioned between the first joint and the second joint of the finger Fg. Alternatively, of the multiple first light sensors 10A, one first light sensor 10A is positioned between the first and second joints of the finger Fg, and the other first light sensor 10A is positioned between the second and third joints of the finger Fg.

[0059] As shown in Figures 2 and 6, the light source 60 has a plurality of first light sources 61 and a plurality of second light sources 62. The first light sources 61 emit infrared light or near-infrared light. The second light sources 62 emit at least one of infrared light, near-infrared light, or green light.

[0060] Infrared light has a wavelength of approximately 660 nm, for example. Near-infrared light has a wavelength of approximately 850 nm, for example. Green light has a wavelength of approximately 525 nm, for example.

[0061] The distance between infrared light and near-infrared light is, for example, 5 mm to 6 mm. The distance between green light and infrared or near-infrared light is, for example, 3 mm to 4 mm.

[0062] The first light source 61 is positioned near the first light sensor 10A. Multiple first light sources 61 are positioned at intervals along the first direction Dx. The second light source 62 is positioned adjacent to the second light sensor 10B.

[0063] Light emitted from the first light source 61 passes through the finger Fg, etc., and enters the sensor pixel PX (see Figure 3) of the first light sensor 10A. As a result, the first light sensor 10A detects the vascular pattern, such as veins, of the finger Fg, etc.

[0064] Meanwhile, the light emitted from the second light source 62 is reflected inside the finger Fg, etc., and incident on the sensor pixel PX (see Figure 3) of the second light sensor 10B. As a result, the second light sensor 10B detects the pulse wave of the finger Fg, etc.

[0065] The first light source 61 has a first light and a second light. The first light is red visible light (red light) of about 660 nm. The second light is infrared light of about 850 nm. The first light source 61 can emit either the first light or the second light. When the first light source 61 emits the first light, the first light sensor 10A acquires a first detection value. Next, the first light source 61 emits the second light, and the first light sensor 10A acquires a second detection value. The control device 200 can calculate the blood oxygen saturation from the difference between the first detection value and the second detection value.

[0066] Most of the oxygen in the blood is reversibly bound to hemoglobin in red blood cells, with only a small portion dissolved in the plasma. More specifically, the percentage of oxygen bound to the blood as a whole is called oxygen saturation (SpO2). By determining the amount of light absorbed by the blood (hemoglobin) from the difference between the first and second detection values, it is possible to calculate blood oxygen saturation.

[0067] As shown in Figure 6, the detection device 1 comprises a housing 100, a first optical sensor 10A, and a second optical sensor 10B. As shown in Figure 2, the inside of the housing 100 has a first mounting surface 101 and a second mounting surface 102, positioned opposite the finger Fg. The first optical sensor 101A is positioned on the first mounting surface 101, and the second optical sensor 10B is positioned on the second mounting surface 102. The position of the second mounting surface 102 is positioned closer to the finger Fg housed in the housing 100 than the position of the first mounting surface 101. As a result, the second optical sensor 10B is closer to the finger Fg than the first optical sensor 10A.

[0068] When a finger Fg is inserted into the housing 80, the finger Fg is pressed against the first optical sensor 10A and the second optical sensor 10B, and measurement begins. The pressure applied to the finger Fg against the first optical sensor 10A is less than the pressure applied to the finger Fg against the second optical sensor 10B. As a result, the first optical sensor 10A can detect veins well, while the second optical sensor 10B can easily detect pulse waves well. This is because the contact load of the finger Fg that allows the first optical sensor 10A to detect veins well (the pressure applied to the finger Fg against the first optical sensor 10A) is different from the contact load of the finger Fg that allows the second optical sensor 10B to detect pulse waves well (the pressure applied to the finger Fg against the second optical sensor 10B).

[0069] In Embodiment 1, a step 103 is provided between the first mounting surface 101 and the second mounting surface 102, so that the contact load of finger Fg on the first optical sensor 10A and the contact load of finger Fg on the second optical sensor 10B are different.

[0070] The control device 200 controls the pressurizing device 70 while displaying the vein biometric information from the first optical sensor 10A and the pulse wave biometric information from the second optical sensor 10B on the display device 210. The pressurizing device 70 expands the elastic body and presses finger Fg against the first optical sensor 10A and the second optical sensor 10B.

[0071] The vein biometric information from the first optical sensor 10A becomes a clear image when the contact load of finger Fg against the first optical sensor 10A is appropriate. The observer can observe the changes in the vein biometric information from the first optical sensor 10A and the pulse wave biometric information from the second optical sensor 10B while varying the pressing force applied to finger Fg by the pressurizing device 70. The detection device 1 of Embodiment 1 can control the pressurizing device 70 so that a clear image is obtained from the vein biometric information from the first optical sensor 10A while detecting the pulse wave from the second optical sensor 10B.

[0072] (Embodiment 2) Figure 7 is a schematic diagram showing an example of the external appearance of the detection device according to Embodiment 2, when a finger is placed inside the device and viewed from the side of the housing. Figure 8 is a plan view of the detection device according to Embodiment 2. In the following description, the same reference numerals are used for the same components as those described in the above-described embodiments, and redundant explanations are omitted.

[0073] As shown in Figures 7 and 8, the detection device 1A of Embodiment 2 is U-shaped, unlike the cylindrical shape of Embodiment 1. The upper side of the detection device 1A of Embodiment 2 is open in the third direction Dz and does not have a pressurizing device 70. The pressurizing device 70 may be provided inside the housing 100, as in Embodiment 1.

[0074] As shown in Figure 7, the housing 100 has a first mounting surface 101 on its inner surface 110, which is positioned opposite to the finger Fg, and a second mounting surface 102, which is positioned opposite to the finger Fg but at a different position from the first mounting surface 101.

[0075] The position of the second mounting surface 102 is higher than the position of the first mounting surface 101. As a result, the position of the second mounting surface 102 is closer to finger Fg than the position of the first mounting surface 101.

[0076] The first light sensor 10A is positioned on the first mounting surface 101, and the second light sensor 10B is positioned on the second mounting surface 102. Furthermore, the position of the second mounting surface 102 is positioned closer to the finger Fg, which is the object to be detected and housed in the housing 100, than the position of the first mounting surface 101.

[0077] As shown in Figure 8, in a plan view, the longitudinal direction of the first light sensor 10A extends in the second direction Dy. The two first light sensors 10A are arranged adjacent to each other with respect to the first direction Dx.

[0078] Multiple first light sources 61 are arranged at intervals along the first direction Dx. Multiple first light sources 61 are also arranged at intervals along the second direction Dy. Therefore, in a plan view, the multiple first light sources 61 are arranged so as to sandwich the first light sensor 10A in the second direction Dy. The second light source 62 is arranged adjacent to the second light sensor 10B.

[0079] In Embodiment 2, when the finger Fg is inserted into the housing 80 from the third direction Dz, the finger Fg is pressed against the first optical sensor 10A and the second optical sensor 10B, and measurement begins. The pressure applied to the finger Fg against the first optical sensor 10A is less than the pressure applied to the finger Fg against the second optical sensor 10B. As a result, the first optical sensor 10A can detect veins well, while the second optical sensor 10B can easily detect pulse waves well.

[0080] Light emitted from the first light source 61 passes through the finger Fg, etc., and enters the sensor pixel PX (see Figure 3) of the first light sensor 10A. As a result, the first light sensor 10A detects the vascular pattern, such as veins, of the finger Fg, etc.

[0081] Meanwhile, the light emitted from the second light source 62 is reflected inside the finger Fg, etc., and incident on the sensor pixel PX (see Figure 3) of the second light sensor 10B. As a result, the second light sensor 10B detects the pulse wave of the finger Fg, etc.

[0082] In Embodiment 2, the control device 200 displays the vein biometric information from the first optical sensor 10A and the pulse wave biometric information from the second optical sensor 10B on the display device 210. This allows observation of changes in the vein biometric information from the first optical sensor 10A and the pulse wave biometric information from the second optical sensor 10B. By adjusting the force with which finger Fg presses against the first optical sensor 10A and the second optical sensor 10B, it is possible to detect the pulse wave from the second optical sensor 10B while simultaneously observing a clear image of the vein biometric information from the first optical sensor 10A.

[0083] While preferred embodiments of this disclosure have been described above, this disclosure is not limited to such embodiments. The contents disclosed in the embodiments are merely examples, and various modifications are possible without departing from the spirit of this disclosure. Any modifications made without departing from the spirit of this disclosure will naturally fall within the technical scope of this disclosure. At least one of various omissions, substitutions, and modifications of components can be made without departing from the gist of each embodiment and each modification described above. [Explanation of symbols]

[0084] 1. 1A detection device 100 cabinets 200 Control device 101 First mounting surface 102 Second mounting surface 111 recess 112 Convex part 10A First Light Sensor 10B Second Optical Sensor 50 light filter layers 70 Pressurizing device 80 Storage Unit 60 light source 61 1st light source 62 Second light source 1st direction Dx 2nd direction Dy Third direction Dz

Claims

1. The system comprises a housing, a first optical sensor for detecting veins in the object to be detected, and a second optical sensor for detecting the pulse wave of the object to be detected. The housing has a first mounting surface at a position facing the object to be detected, and a second mounting surface at a position facing the object to be detected but different from the first mounting surface. The first light sensor is positioned on the first mounting surface, The second light sensor is positioned on the second mounting surface, The position of the second mounting surface is positioned closer to the object to be detected housed in the housing than the position of the first mounting surface. Detection device.

2. A step is provided between the first mounting surface and the second mounting surface. The detection device according to claim 1.

3. The housing has a recess provided so as to surround the first light sensor and a protrusion that projects toward the object to be detected, The first mounting surface is positioned on the bottom surface of the recess, The second mounting surface is positioned on the top of the protrusion, The detection device according to claim 1.

4. The first light sensor has a plurality of photodiodes arranged along the first mounting surface, The second light sensor has at least one photodiode, The detection device according to claim 1.

5. The housing has a pressurizing device that pushes the object to be detected, positioned so as to sandwich the object to be detected between the first or second optical sensor. The detection device according to claim 1.

6. The pressurizing device can vary the pressing force applied to the object to be detected. The detection device according to claim 5.

7. The pressurizing device has an elastic body that contains a gas inside and whose size changes according to the gas pressure of the gas, and the gas pressure can be changed. The detection device according to claim 5.

8. The housing extends in a first direction and has a housing portion parallel to the first direction, The aforementioned housing section is capable of housing a part of the object to be detected, The first light sensor has a plurality of photodiodes, The first light sensor extends in the first direction, The detection device according to claim 1.

9. The housing comprises a first light source that emits infrared light or near-infrared light, and a second light source that emits at least one of infrared light, near-infrared light, and green light. The detection device according to claim 8.

10. Multiple first light sources are arranged along the first direction, The second light source is positioned adjacent to the second light sensor, The detection device according to claim 9.

11. The aforementioned plurality of photodiodes are OPDs (Organic Photodiodes). The detection device according to any one of claims 8 to 10.

12. The housing extends in a first direction and has a housing portion parallel to the first direction, The aforementioned housing section is capable of arranging a part of the object to be detected, The first light sensor has multiple photodiodes, The first light sensor extends in a second direction intersecting the first direction. The detection device according to claim 1.

13. The housing comprises a first light source that emits infrared light or near-infrared light, and a second light source that emits at least one of infrared light, near-infrared light, and green light. The detection device according to claim 12.

14. Multiple first light sources are arranged in a plan view so as to sandwich the first light sensor in the second direction. The second light source is positioned adjacent to the second light sensor, The detection device according to claim 13.

15. The aforementioned plurality of photodiodes are OPDs (Organic Photodiodes). The detection device according to any one of claims 12 to 14.

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