Finger vein acquisition device

Abstract

The embodiment of the invention provides a finger vein collecting device, which comprises a shell, a finger vein collecting device and a finger vein collecting device, the flexible optical sensor is used for performing vein detection on the finger placed in the accommodating groove; the sensing module comprises a first light source and a proximity sensor, the first light source is used for emitting sensing light, and the proximity sensor is used for outputting a first preset signal under the condition that the frequency of reflected light meets a first preset condition; the light supplementing module comprises a second light source used for emitting reinforcing light and an ambient light sensor, and the ambient light sensor is used for outputting a second preset signal under the condition that the intensity of the ambient light meets a second preset condition; the control circuit board is configured to respond to a first preset signal and control the ambient light sensor to be turned on; and in response to a second preset signal, controlling the second light source to be turned on. According to the technical scheme provided by the embodiment of the invention, the infrared light can be intelligently reinforced while the approach of the finger of the user is monitored, so that the acquisition quality of the finger vein image is improved.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a finger vein collection device. Background Art

[0002] The finger vein collection device uses the absorption characteristics of human hemoglobin to near-infrared light to collect the texture image of the finger vein and is widely used in technical fields such as identity authentication and health monitoring.

[0003] Related technologies have proposed a finger vein acquisition device that uses a rigid circuit board integrated device. In this type of finger vein acquisition device, sensors, infrared LEDs and other devices are integrated at fixed positions on the rigid circuit board, resulting in a large size, tight internal space and difficult assembly of the finger vein acquisition device. In addition, infrared light may be severely attenuated after passing through the finger, which will affect the acquisition effect of the finger vein image. The existing finger vein acquisition devices have integrated sensors of a single type and limited functions, and cannot guarantee the acquisition quality of the finger vein image. Summary of the invention

[0004] The embodiment of the present application provides a finger vein collection device to solve or alleviate one or more technical problems in the prior art.

[0005] As one aspect of an embodiment of the present application, an embodiment of the present application provides a finger vein collection device, comprising: a housing, a top of which is provided with an inwardly recessed receiving groove, the bottom wall of which is in the shape of a curved surface; a flexible optical sensor, arranged on the bottom wall of the receiving groove, for performing vein detection on a finger placed in the receiving groove; a sensing module, arranged in the housing, comprising a first light source and a proximity sensor; the first light source is used to emit a sensing light to one side of the receiving groove; the proximity sensor is used to receive a reflected light of the finger to the sensing light, and output a first preset signal when the frequency of the reflected light meets a first preset condition; a fill light module, arranged in the housing, comprising a second light source and an ambient light sensor; the ambient light sensor is used to detect the intensity of the ambient light, and output a second preset signal when the intensity of the ambient light meets a second preset condition; the second light source is used to emit a reinforced light to one side of the receiving groove; a control circuit board, arranged in the housing, and electrically communicating with the flexible optical sensor, the sensing module and the fill light module respectively; the control circuit board is configured to: control the ambient light sensor to turn on in response to the first preset signal; and, control the second light source to turn on in response to the second preset signal.

[0006] In one embodiment, the finger vein collection device also includes: a first flexible connection part, the first connection end of the first flexible connection part is electrically connected to the first light source, the proximity sensor, the second light source and the ambient light sensor respectively, and the second connection end of the first flexible connection part is electrically connected to the control circuit board.

[0007] In one embodiment, the flexible optical sensor includes a first detection area and a second detection area adjacent to each other; the finger vein collection device also includes: two second flexible connection parts, the first connection ends of the two second flexible connection parts are respectively connected to the first detection area and the second detection area in a one-to-one correspondence, and the second connection ends of the two second flexible connection parts are respectively electrically connected to the control circuit board.

[0008] In one embodiment, a first connector and a second connector are provided on the control circuit board, the first connector is connected to the second connection end of the first flexible connection part, and the second connector is connected to the second connection end of the second flexible connection part; the control circuit board is provided with a keep-out area around the first connector and / or the second connector.

[0009] In one embodiment, the second connector includes a retractable limiting column and a pressure plate, the second flexible connection portion is provided with a limiting hole adjacent to the second connection end, the retractable limiting column passes through the limiting hole, and the pressure plate is pressed onto the second connection end of the second flexible connection portion.

[0010] In one embodiment, the first light source and the second light source are infrared light emitting diodes.

[0011] In one embodiment, the shell includes a bottom plate, a top plate and a middle frame, the bottom plate and the top plate are spaced apart, and the middle frame is connected between the bottom plate and the top plate; the surface of the top plate facing away from the bottom plate defines a receiving groove; wherein the sensing module, the fill light module and the control circuit board are all arranged between the bottom plate and the top plate.

[0012] In one embodiment, the shell further includes a accommodating portion, which is disposed on a side of the top plate adjacent to the bottom plate, and the interior of the accommodating portion defines a first sub-cavity and a second sub-cavity spaced apart from each other, the first sub-cavity being used to accommodate the proximity sensor, and the second sub-cavity being used to accommodate the ambient light sensor.

[0013] In one embodiment, there are two sensing modules and two fill light modules respectively; the proximity sensors of the two sensing modules are respectively arranged adjacent to the two side edges of the top plate in the first direction, and the first light source of each sensing module is integrated with the proximity sensor; the ambient light sensors of the two fill light modules are respectively arranged adjacent to the two side edges of the top plate in the first direction, and the second light sources of the two fill light modules are respectively arranged adjacent to the two side edges of the top plate in the second direction, and the second direction is perpendicular to the first direction.

[0014] In one embodiment, the middle frame is connected to the top plate and the bottom plate respectively via snap-fit ​​structures.

[0015] In one embodiment, the shell further includes a plurality of support columns spaced apart from each other, and the plurality of support columns are connected between the bottom plate and the top plate.

[0016] In one embodiment, the top plate is also provided with a plurality of positioning columns extending in a direction toward the bottom plate, and the control circuit board is provided with a plurality of positioning holes corresponding one-to-one to the plurality of positioning columns and the plurality of supporting columns, and the positioning holes are used for the positioning columns or the supporting columns to pass through; wherein the cross-sectional shape of the positioning holes is an ellipse.

[0017] The technical solution of the embodiment of the present application can monitor in real time whether the user's finger is approaching through the cooperation of the sensing module and the fill light module. While monitoring the approach of the finger, the finger vein acquisition device provided by the embodiment of the present application can intelligently enhance the infrared light according to the intensity of the ambient light, significantly reducing the impact of insufficient ambient light on the acquisition effect of the finger vein image, and improving the acquisition quality of the finger vein image.

[0018] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0020] Figure 1 A schematic structural diagram of a finger vein collection device according to an embodiment of the present application is shown.

[0021] Figure 2 A three-dimensional schematic diagram of a finger vein collection device according to an embodiment of the present application is shown.

[0022] Figure 3 A schematic diagram showing the back side of a control circuit board of a finger vein collection device according to an embodiment of the present application at one viewing angle is shown.

[0023] Figure 4 A schematic diagram showing the back side of the control circuit board of the finger vein collection device according to an embodiment of the present application at another viewing angle is shown.

[0024] Figure 5 A front view of a finger vein collection device according to an embodiment of the present application is shown.

[0025] Figure 6 A control architecture diagram of a finger vein collection device according to an embodiment of the present application is shown.

[0026] Figure 7 A top view of the housing of a finger vein collection device according to an embodiment of the present application is shown.

[0027] Figure 8 A control timing diagram of a finger vein collection device according to an embodiment of the present application is shown.

[0028] Description of reference numerals:

[0029] 1- Finger vein collection device;

[0030] 10-housing; 11-bottom plate; 12-top plate; 13-middle frame; 14-accommodating portion; 15-buckle structure; 16-support column; 17-positioning column;

[0031] 20-Flexible optical sensor;

[0032] 30-sensing module; 31-first light source; 32-proximity sensor;

[0033] 40- fill light module; 41- second light source; 42- ambient light sensor;

[0034] 50-control circuit board; 51-first connector; 52-second connector; 521-retractable limit column; 522-pressing plate; 54-positioning hole;

[0035] 61-first flexible connection portion; 62-second flexible connection portion;

[0036] First direction - X; Second direction - Y;

[0037] 2-Finger; 3-Computer. DETAILED DESCRIPTION

[0038] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0039] Compared with muscle tissue, human hemoglobin has a stronger absorption effect on near-infrared light with a wavelength of 700nm-1000nm. The finger vein acquisition device can utilize the absorption characteristics of human hemoglobin to near-infrared light to collect the texture image of the finger vein, and is widely used in technical fields such as identity verification and health monitoring. Specifically, when the near-infrared light irradiates the user's finger, part of the near-infrared light penetrates the finger tissue and is absorbed by the hemoglobin in the finger vein, while part of the infrared light that is not absorbed is reflected and received by the flexible optical sensor. Because hemoglobin absorbs part of the near-infrared light, the vein area appears as a darker part in the image, while other parts are brighter. By processing the image collected by the flexible optical sensor, the user's finger vein image can be extracted for user identity recognition or health monitoring.

[0040] The related art proposes a finger vein collection device using a hard circuit board integrated device. The integrated positions of the sensors, infrared LEDs and other devices on this finger vein collection device are relatively fixed, which not only has a large external volume, but also has the defects of tight internal space and difficult assembly. In addition, the infrared light may be severely attenuated after passing through the finger, and the insufficient intensity of the light reflected by the finger will affect the collection effect of the finger vein image, and the collection quality of the finger vein image cannot be guaranteed.

[0041] In view of the above-mentioned defects existing in the related art, the embodiment of the present application proposes a finger vein acquisition device 1, which can monitor in real time whether the user's finger 2 is approaching through the cooperation of the sensing module 30 and the fill light module 40. While monitoring the approach of the finger 2, the finger vein acquisition device 1 provided in the embodiment of the present application can intelligently enhance the infrared light according to the intensity of the reflected light in the current environment, significantly reducing the influence of the insufficient reflected light intensity of the finger 2 on the acquisition effect of the finger vein image, and improving the acquisition quality of the finger vein image.

[0042] Figure 1 A schematic diagram of a finger vein collection device 1 according to an embodiment of the present application is shown. Figure 2 FIG. 1 is a perspective schematic diagram of a finger vein collection device 1 according to an embodiment of the present application. Figure 1 and Figure 2 As shown, the finger vein collection device 1 provided in the embodiment of the present application includes a housing 10 , a flexible optical sensor 20 , a sensing module 30 , a fill light module 40 and a control circuit board 50 .

[0043] Specifically, the top of the housing 10 is provided with an inwardly recessed receiving groove, and the bottom wall of the receiving groove is in the shape of a curved surface. The flexible optical sensor 20 is arranged on the bottom wall of the receiving groove, and is used to perform vein detection on the finger 2 placed in the receiving groove. The sensing module 30 is arranged on the housing 10, and includes a first light source 31 and a proximity sensor 32. The first light source 31 is used to emit a sensing light to one side of the receiving groove. The proximity sensor 32 is used to receive the reflected light of the finger 2 to the sensing light, and output a first preset signal when the frequency of the reflected light meets the first preset condition. The fill light module 40 is arranged on the housing 10, and includes a second light source 41 and an ambient light sensor 42. The ambient light sensor 42 is used to detect the intensity of the ambient light, and output a second preset signal when the intensity of the ambient light meets the second preset condition. The second light source 41 is used to emit a reinforcement light to one side of the receiving groove. The control circuit board 50 is arranged on the housing 10, and is electrically communicated with the flexible optical sensor 20, the sensing module 30 and the fill light module 40 respectively. The control circuit board 50 is configured to: control the ambient light sensor 42 to turn on in response to a first preset signal; and control the second light source 41 to turn on in response to a second preset signal.

[0044] For example, the shape and size of the receiving groove on the top of the housing 10 can be designed with reference to ergonomic principles, and the curved surface presented by the bottom wall shape of the receiving groove can match the curvature of the surface of the human finger 2 to ensure the accuracy of finger vein collection and the comfort of the user during vein collection. At the same time, the shape and size of the housing 10 can match the layout of its internal components to ensure the rational use of the internal space of the finger vein collection device 1. In addition, the housing 10 can be made of high-strength, wear-resistant plastics, alloys and other materials, and the surface of the housing 10 can be provided with anti-slip textures or coatings to increase the stability of the user's grip.

[0045] In the embodiment of the present application, the flexible optical sensor 20 can be arranged on the bottom wall of the receiving groove, and is used to perform vein detection on the finger 2 placed in the receiving groove. Exemplarily, the flexible optical sensor 20 can adopt a flexible polymer substrate, combined with a highly sensitive photoelectric detection material, such as a silicon-based photodiode, to accurately capture the optical signal reflected by the user's finger 2, and convert it into an electrical signal for transmission to the control circuit board 50. The embodiment of the present application does not limit the specific type of the flexible optical sensor 20. The flexible optical sensor 20 can be arranged on the bottom wall of the receiving groove, and cooperate with the bottom wall of the receiving groove of the housing 10 to form a curved surface shape, so as to increase the fitting area with the user's finger 2, and improve the acquisition accuracy of the vein image and the user's comfort.

[0046] Exemplarily, the sensing module 30, the fill light module 40 and the control circuit board 50 may be disposed inside the housing 10. The sensing module 30 may include a first light source 31 and a proximity sensor 32, wherein the first light source 31 is used to emit a sensing light toward one side of the receiving groove, and the sensing light forms a reflected light after encountering the finger 2 approaching the receiving groove, and when the reflected light received by the proximity sensor 32 meets the first preset condition, the proximity sensor 32 outputs a first preset signal to the control circuit board 50. The first preset condition may be that the frequency of the reflected light received by the proximity sensor 32 is the same as or close to the predicted frequency of the sensing light.

[0047] In some examples, the first light source 31 may be an infrared light source for emitting infrared light, the proximity sensor 32 may be an infrared light proximity sensor 32, and the reflected light received by the proximity sensor 32 may be a pulse light signal at a preset frequency. It should be noted that in order to avoid the influence of external ambient light on the detection result of the proximity sensor 32, the light intensity of the sensing light emitted by the first light source 31 may be greater than the light intensity of the external ambient light under normal circumstances.

[0048] Exemplarily, the fill light module 40 may include a second light source 41 and an ambient light sensor 42. The ambient light sensor 42 may be used to detect the intensity of ambient light, and output a second preset signal to the control circuit board 50 when the intensity of ambient light meets the second preset condition, and the second light source 41 may be used to emit a reinforcement light to one side of the accommodating groove. The second preset condition may be that the intensity of ambient light is greater than or equal to the intensity threshold. It should be noted that the intensity of the reflected light of the infrared light will be attenuated after being reflected by the finger 2. When the intensity of the external ambient light is insufficient, the intensity of the light signal reflected by the user's finger 2 based on the external ambient light is relatively weak, resulting in the grayscale value of the finger vein image collected by the finger vein acquisition device 1 may be low, and the image quality may not meet the biometric recognition standard. Based on this, the reinforcement light emitted by the second light source 41 can reinforce the intensity of the light signal reflected by the user's finger 2 when the intensity of the external ambient light is relatively weak, thereby improving the accuracy and reliability of the vein detection results of the flexible optical sensor 20.

[0049] In some examples, the ambient light sensor 42 may be a photoresistor, a photodiode, or any other type of sensor, and the second light source 41 may be an infrared light source for emitting infrared light.

[0050] In some specific examples, the first light source 31 and the second light source 41 can use high-efficiency, low-power infrared light emitting diodes, and can emit near-infrared light with a wavelength range of 700nm-1000nm.

[0051] Exemplarily, the control circuit board 50 is in electrical communication with the flexible optical sensor 20, the sensing module 30 and the fill light module 40, respectively, so that the control circuit board 50 can receive the first preset signal sent by the proximity sensor 32 and the second preset signal sent by the ambient light sensor 42. The control circuit board 50 can be configured to: control the ambient light sensor 42 to turn on in response to the first preset signal; and control the second light source 41 to turn on in response to the second preset signal.

[0052] In the embodiment of the present application, the ambient light sensor 42 may be in a normally closed state, and the ambient light sensor 42 is turned on by the control circuit board 50 only when the control circuit board 50 receives the first preset signal. In other words, before the user's finger 2 approaches or is not placed in the receiving slot, the ambient light sensor 42 is in a dormant state, and is turned on under the control of the control circuit board 50 only after the user's finger 2 approaches or is placed in the receiving slot. It should be noted that, compared with the setting mode in which the ambient light sensor 42 is always in the turned-on state, when the ambient light sensor 42 detects that the intensity of the ambient light is not enough to turn on the second light source 41, the reinforcement light emitted by the second light source 41 interferes with the sensing light emitted by the first light source 31, thereby affecting the detection accuracy of the proximity sensor 32. It can be seen from the above example that the proximity sensor 32 in the embodiment of the present application can sense the finger 2 without being interfered by the second light source 41, thereby improving the accuracy of the sensing module 30 sensing the position of the finger 2.

[0053] In addition, the control circuit board 50 can also be configured to: in response to the first preset signal, control the flexible optical sensor 20 to turn on. The flexible optical sensor 20 can be in a normally closed state, and the flexible optical sensor 20 is controlled to turn on by the control circuit board 50 only when the control circuit board 50 receives the first preset signal sent by the proximity sensor 32. Such a setting can reduce the energy consumption of the finger vein collection device 1.

[0054] The sensing module 30 provided in the embodiment of the present application can be used to monitor in real time whether the user's finger 2 is close to the finger vein acquisition device 1, and the fill light module 40 can be used to detect the intensity of the current ambient light through the ambient light sensor 42 when the user's finger 2 is detected to be close, and to reinforce the infrared light when the ambient light intensity is insufficient. The control circuit board 50 can control the working process of the finger vein acquisition device 1 through electrical communication with the flexible optical sensor 20, the sensing module 30 and the fill light module 40, ensure that the ambient light sensor 42 is activated to detect the intensity of the current ambient reflected light when the user's finger 2 is close, and activate the second light source 41 for fill light when the light intensity reflected by the finger 2 is insufficient, so as to ensure the acquisition quality of the finger vein image.

[0055] Specifically, the first light source 31 can emit a sensing light of a specific frequency to one side of the receiving groove in real time. When the user's finger 2 approaches the receiving groove, part of the sensing light will be reflected by the user's finger 2. After receiving the reflected light, the proximity sensor 32 of the sensing module 30 can determine whether the frequency of the reflected light meets the first preset condition. Exemplarily, the proximity sensor 32 matches the reflected light with the specific frequency of the sensing light from the first light source 31. If the match is successful, the vein information of the user is collected and the first preset signal is output to the control circuit board 50 to indicate that the user's finger 2 has approached. Further, the control circuit board 50 can control the ambient light sensor 42 to turn on in response to the first preset signal. The ambient light sensor 42 can detect the intensity of the infrared light reflected by the current environment, that is, the intensity of the ambient light. If the intensity of the ambient light meets the second preset condition, that is, the intensity of the infrared light reflected by the current environment is lower than the set threshold, resulting in the image grayscale of the flexible optical sensor 20 failing to meet the recognition requirements, the ambient light sensor 42 outputs a second preset signal to the control circuit board 50. After receiving the second preset signal, the control circuit board 50 controls the second light source 41 to turn on, and the second light source 41 emits reinforcement light to one side of the receiving groove to reinforce the light reflected by the finger 2 to ensure the acquisition quality of the finger vein image.

[0056] In summary, the finger vein acquisition device 1 provided in the embodiment of the present application can improve the accuracy of finger vein acquisition and user comfort by adopting a receiving groove with a curved bottom wall shape and a flexible optical sensor 20 adapted to the bottom wall shape of the receiving groove. In addition, by setting a sensing module 30 and a fill light module 40 that are communicatively connected to the control circuit board 50, it is possible to monitor in real time whether the user's finger 2 is approaching. When the finger 2 is detected to be approaching, the ambient light sensor 42 of the fill light module 40 is controlled to be turned on to detect the intensity of the ambient light, and when the intensity of the ambient light does not meet the preset intensity, the second light source 41 is controlled to be turned on to reinforce the intensity of the light signal reflected by the finger 2, which can significantly reduce the influence of insufficient ambient light intensity on the acquisition effect of the finger vein image, improve the acquisition quality of the finger vein image, and thus improve the accuracy of finger vein detection.

[0057] In one embodiment, there are two sensing modules 30 and two fill light modules 40. The proximity sensors 32 of the two sensing modules 30 are respectively arranged adjacent to the two side edges of the top plate 12 in the first direction X, and the first light source 31 of each sensing module 30 is integrated with the proximity sensor 32. The ambient light sensors 42 of the two fill light modules 40 are respectively arranged adjacent to the two side edges of the top plate 12 in the first direction X, and the second light sources 41 of the two fill light modules 40 are respectively arranged adjacent to the two side edges of the top plate 12 in the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0058] Exemplarily, the first direction X may be the width direction of the control circuit board 50, and the second direction Y may be the length direction of the control circuit board 50. The proximity sensors 32 of the two sensing modules 30 may be arranged on two side edges of the control circuit board 50 that are oppositely arranged in the width direction thereof, and the first light source 31 of each sensing module 30 is integrated on the respective proximity sensors 32. The ambient light sensors 42 of the two fill light modules 40 may be arranged on two side edges of the control circuit board 50 that are oppositely arranged in the width direction thereof, and the proximity sensors 32 and the ambient light sensors 42 on any side edge may be arranged side by side in the length direction of the control circuit board 50. The second light sources 41 of the two fill light modules 40 may be arranged on opposite sides of the control circuit board 50 in the length direction thereof.

[0059] Through the above implementation, on the one hand, the sensing module 30 and the fill light module 40 can have a certain redundancy, so that when any sensing module 30 or any fill light module 40 fails, the other sensing module 30 or the other fill light module 40 can ensure the normal function, thereby improving the reliability of the finger vein collection device 1. On the other hand, the two sensing modules 30 and the two fill light modules 40 can also run synchronously, thereby improving the detection sensitivity of the finger 2 and the fill light effect.

[0060] Figure 3 A schematic diagram showing the back side of the control circuit board 50 of the finger vein collection device 1 according to an embodiment of the present application at a viewing angle is shown. Figures 1 to 3 As shown, in one embodiment, the finger vein collection device 1 also includes a first flexible connection portion 61, and the first connection end of the first flexible connection portion 61 is electrically connected to the first light source 31, the proximity sensor 32, the second light source 41 and the ambient light sensor 42 respectively, and the second connection end of the first flexible connection portion 61 is electrically connected to the control circuit board 50.

[0061] Exemplarily, the first flexible connection part 61 can adopt a flexible printed circuit board (Flexible Printed Circuit, FPC) or a flexible flat cable (Flexible Flat Cable, FFC), these materials have good flexibility and conductivity, and can realize electrical connection in the limited space inside the finger vein collection device 1. FPC is usually made of polyimide or polyester film as a substrate, combined with a copper foil circuit, and has the advantages of being light, resistant to bending and highly reliable. FFC is composed of a plurality of parallel arranged wires, and has the characteristics of simple structure and low cost. Preferably, the first flexible connection part 61 can adopt a flexible printed circuit board.

[0062] In some examples, the first flexible connection portion 61 may have multiple first connection ends, and the multiple first connection ends are respectively connected to each proximity sensor 32 , each first light source 31 , each ambient light sensor 42 , and each second light source 41 in a one-to-one correspondence.

[0063] More specifically, the first flexible connection portion 61 can be generally located on the side of the control circuit board 50 facing the accommodating groove (i.e., the back side), and the first flexible connection portion 61 is respectively provided with first connection ends on both sides in the second direction Y, and the first connection ends on both sides can be bent upward and electrically connected to the two second light sources 41 accordingly.

[0064] According to the above embodiment, by providing the first flexible connection portion 61, a stable electrical connection between the first light source 31, the proximity sensor 32, the second light source 41, the ambient light sensor 42 and the control circuit board 50 is ensured, thereby ensuring the accuracy and real-time performance of signal transmission. The control circuit board 50 can timely control the working state of each light source and sensor according to the received signal, thereby realizing efficient detection of the veins of the finger 2 and automatic adjustment of the ambient light conditions. As a result, the detection accuracy, response speed and service life of the finger vein detection device are improved, and the requirements for efficient and reliable finger vein collection are met.

[0065] Secondly, the wiring structure inside the finger vein detection device can be significantly simplified, the use of cables can be reduced, and the assembly efficiency and reliability of the device can be improved. In addition, the first flexible connection part 61 using FPC can adapt to the curved surface design inside the housing 10 and the different position arrangements of various components, avoiding electrical connection failures caused by cable bending or stretching, and can also reduce the overall weight of the device, improving portability and user experience.

[0066] Figure 4 A schematic diagram of the back side of the control circuit board 50 of the finger vein collection device 1 according to an embodiment of the present application is shown at another viewing angle, wherein the control circuit board 50 is made transparent to show the structure of the first flexible connection portion 61 located on the side of the control circuit board 50 facing the receiving groove; Figure 5 FIG. 1 is a front view of a finger vein collection device 1 according to an embodiment of the present application. Figures 1 to 5 As shown, in one embodiment, the flexible optical sensor 20 includes a first detection area and a second detection area adjacent to each other. The finger vein collection device 1 also includes two second flexible connecting parts 62, the first connecting ends of the two second flexible connecting parts 62 are respectively connected to the first detection area and the second detection area in a one-to-one correspondence, and the second connecting ends of the two second flexible connecting parts 62 are respectively electrically connected to the control circuit board 50.

[0067] In the embodiment of the present application, the finger vein acquisition device 1 further optimizes the design of the flexible optical sensor 20 to improve the signal transmission efficiency and detection sensitivity of the finger vein detection. Specifically, the flexible optical sensor 20 includes a first detection area and a second detection area adjacent to each other. The two detection areas are respectively arranged to receive the light signal reflected by the finger 2, and the corresponding detection results are output, thereby improving the signal transmission efficiency and detection sensitivity. The finger vein acquisition device 1 also includes two second flexible connecting parts 62, the first connecting ends of the two second flexible connecting parts 62 are respectively connected to the first detection area and the second detection area in a one-to-one correspondence, and the second connecting ends of the two second flexible connecting parts 62 are respectively electrically connected to the control circuit board 50. The first detection area and the second detection area are connected to the control circuit board 50 through the flexible connecting part, which can realize stable transmission and accurate detection of signals.

[0068] Exemplarily, the two second flexible connection parts 62 may also be formed by a flexible printed circuit board (Flexible Printed Circuit, FPC) or a flexible flat cable (Flexible Flat Cable, FFC).

[0069] Preferably, both second flexible connection parts 62 can be made of FPC. The first connection end of one of the second flexible connection parts 62 is electrically connected to the binding area set at the side edge of the first detection area, and the second connection end bypasses one side of the control circuit board 50 in the second direction Y and is electrically connected to the side of the control circuit board 50 away from the receiving groove; the first connection end of the other second flexible connection part 62 is electrically connected to the binding area set at the side edge of the second detection area, and the second connection end bypasses the other side of the control circuit board 50 in the second direction Y and is electrically connected to the side of the control circuit board 50 away from the receiving groove.

[0070] Through the above-mentioned embodiment, by using two second flexible connecting parts 62 to electrically connect the flexible optical sensor 20 and the control circuit board 50, the connection stability between the first detection area and the second detection area of ​​the flexible optical sensor 20 and the control circuit board 50 is ensured, and the accuracy and real-time performance of signal transmission are guaranteed. The control circuit board 50 can process and analyze the finger vein image in a timely manner according to the received signal, thereby realizing efficient detection of the veins of the finger 2. The overall design improves the detection accuracy, response speed and service life of the device, and meets the requirements of efficient and reliable finger vein collection. At the same time, by optimizing the design of the flexible optical sensor 20 and the second flexible connecting part 62, the portability and user experience of the device can be improved, and it can adapt to a variety of application scenarios.

[0071] Secondly, it can ensure that the signals of the first detection area and the second detection area of ​​the flexible optical sensor 20 can be stably transmitted to the control circuit board 50. In addition, by adopting the second flexible connection part 62, it can adapt to the complex layout inside the finger vein collection device 1 and avoid electrical connection failures caused by cable bending or stretching. At the same time, the high flexibility and high reliability of the second flexible connection part 62 can improve the assembly efficiency and overall reliability of the device, reduce the use of traditional rigid cables, and simplify the wiring structure.

[0072] In one embodiment, a first connector 51 and a second connector 52 are provided on the control circuit board 50 . The first connector 51 is connected to the second connection end of the first flexible connection portion 61 , and the second connector 52 is connected to the second connection end of the second flexible connection portion 62 .

[0073] Exemplarily, the first connector 51 and the second connector 52 can be respectively arranged on the side of the control circuit board 50 away from the receiving groove. The first connector 51 and the second connector 52 can respectively adopt vertical connectors with a self-locking function, and the second connection ends of the first flexible connection part 61 and the second flexible connection part 62 can adopt gold fingers 2 adapted to the vertical connector.

[0074] Such a configuration, on the one hand, improves the convenience of connecting the first flexible connection part 61 and the second flexible connection part 62 with the control circuit board 50, and on the other hand, helps to reduce the number of first connectors 51 and second connectors 52, reducing the space occupied by the control circuit board 50, thereby helping to reduce the size of the control circuit board 50, and further reducing the external dimensions of the finger vein collection device 1.

[0075] Furthermore, the control circuit board 50 is provided with a keep-out area around the first connector 51 and / or the second connector 52 .

[0076] It can be understood that the forbidden area refers to a blank area on the control circuit board 50 where no components or circuit structures are arranged. By setting the forbidden area around the first connector 51 and / or the second connector 52, when the first flexible connection part 61 or the second flexible connection part 62 is deformed or the position changes, the circuit structure on the first flexible connection part 61 or the second flexible connection part 62 can contact the control circuit board 50 in the surrounding area of ​​the first connector 51 and / or the second connector 52 to cause an electrical connection failure, which can reduce the influence of external interference on the signal, thereby improving the working reliability of the finger vein collection device 1.

[0077] Figure 6 FIG. 1 shows a control architecture diagram of a finger vein collection device 1 according to an embodiment of the present application. Figure 6As shown, the control architecture of the finger vein collection device 1 of the embodiment of the present application includes a control circuit board 50, a first flexible connection part 61 and two second flexible connection parts 62. The control circuit board 50 includes a control chip (MCU) and a restart module (RESET), a clock module (CLOCK), a communication module, a first connector 51 (FPC CONNECTOR 1) and two second connectors 52 (FPC CONNECTOR 2) respectively connected to the control chip for communication. The communication module includes a first interface module (USB PHY) connected to the driver chip for communication and a second interface module (TYPE C) connected to the first interface module for communication, wherein the second interface module is used to be electrically connected to the computer 3 to transmit the detection result of the finger vein device to the computer 3. The first flexible connection portion 61 and the two second flexible connection portions 62 are respectively communicatively connected with the corresponding connectors through the gold fingers 2, wherein the first flexible connection portion 61 is used to connect the first connector 51 with the proximity sensor 32 (IR SENSOR), the ambient light sensor 42 (ALS SENSOR), the first light source 31 and the second light source 41 (IR LED), respectively, and the two second flexible connection portions 62 are used to communicatively connect the respective corresponding second connectors 52 with the ROIC (Readout Integrated Circuit) of the first detection area and the second detection area of ​​the flexible optical sensor 20, respectively.

[0078] In one embodiment, Figure 5 As shown, the second connector 52 includes a retractable limiting column 521 and a pressure plate 522, the second flexible connection part 62 is provided with a limiting hole adjacent to the second connection end, the retractable limiting column 521 is passed through the limiting hole, and the pressure plate 522 is pressed on the second connection end of the second flexible connection part 62.

[0079] Exemplarily, the telescopic limit column 521 may include a first section and a second section that are nested, and the first section can slide between a first position and a second position relative to the second section. In addition, an elastic member is also provided between the first section and the second section, and under the elastic force of the elastic member, the first section is always in the first position relative to the second section.

[0080] During the assembly process, the limiting hole of the second flexible connection part 62 can be sleeved on the retractable limiting column 521, and the second connection end of the second flexible connection part 62 can be pressed against the surface of the control circuit board 50 through the pressing plate 522 to achieve the connection and fixation of the second flexible connection part 62 on the control circuit board 50. When the second flexible connection part 62 needs to be removed from the control circuit board 50, the first section of the retractable limiting column 521 can be pressed downward to move the first section relative to the second section to the second position, at which time the first section is disengaged from the limiting hole on the second flexible connection part 62, so that the second connection end of the second flexible connection part 62 can be removed from the lower side of the pressing plate 522.

[0081] Through the above-mentioned implementation, the disassembly and assembly convenience and the connection stability of the second flexible connection part 62 and the control circuit board 50 are improved.

[0082] like Figure 1 and Figure 2 In one embodiment, the housing 10 includes a bottom plate 11, a top plate 12 and a middle frame 13 (not shown in the figure). The bottom plate 11 and the top plate 12 are spaced apart, and the middle frame 13 is connected between the bottom plate 11 and the top plate 12; the surface of the top plate 12 facing away from the bottom plate 11 defines a receiving groove. Among them, the sensing module 30, the fill light module 40 and the control circuit board 50 are all arranged between the bottom plate 11 and the top plate 12.

[0083] Figure 7 FIG. 1 is a top view of the housing 10 of the finger vein collection device 1 according to an embodiment of the present application. Figure 7 As shown, optionally, the middle frame 13 is connected to the top plate 12 and the bottom plate 11 respectively via snap-fit ​​structures 15 .

[0084] Exemplarily, the snap structure 15 may include a slot and a protrusion structure. The number of the slots may be multiple and arranged at intervals on the middle frame 13, and the protrusion structure may be multiple corresponding to the multiple slots and arranged on the edge of the top plate 12 or the bottom plate 11, and each protrusion structure is locked in the corresponding slot.

[0085] According to the above embodiment, the middle frame 13 is connected to the bottom plate 11 and the top plate 12 without fasteners, and the assembly connection can be achieved through the snap-fit ​​structure 15, thereby improving the assembly convenience and connection stability.

[0086] In one embodiment, the shell 10 also includes a accommodating portion 14, which is arranged on a side of the top plate 12 adjacent to the bottom plate 11, and the interior of the accommodating portion 14 is defined by a first sub-cavity and a second sub-cavity spaced apart from each other, the first sub-cavity is used to accommodate the proximity sensor 32, and the second sub-cavity is used to accommodate the ambient light sensor 42.

[0087] Exemplarily, the accommodating portion 14 can be disposed adjacent to the middle of the accommodating groove in the second direction Y. The proximity sensor 32 disposed in the first sub-cavity will not receive the reinforcement light emitted by the second light source 41 due to the obstruction of the inner wall of the first sub-cavity, so that the proximity sensor 32 will not be disturbed by the reinforcement light, thereby improving the detection accuracy of the proximity sensor 32. Correspondingly, the ambient light sensor 42 disposed in the second sub-cavity will not receive the sensing light emitted by the first light source 31 integrated with the proximity sensor 32 due to the obstruction of the inner wall of the second sub-cavity, so that the ambient light sensor 42 will not be disturbed by the sensing light, thereby improving the detection accuracy of the ambient light sensor 42.

[0088] In addition, the depth of the second sub-cavity is smaller than the depth of the first sub-cavity, so that the ambient light sensor 42 can be closer to the receiving groove, which is beneficial for the ambient light sensor 42 to detect the intensity of the ambient light more accurately.

[0089] Through the above implementation, mutual interference between the sensing module 30 and the fill light module 40 can be avoided, thereby improving the working reliability and detection accuracy of the finger vein detection device.

[0090] In one embodiment, there are two sensing modules 30 and two fill light modules 40; the proximity sensors 32 of the two sensing modules 30 are respectively arranged adjacent to the two side edges of the top plate 12 in the first direction X, and the first light source 31 of each sensing module 30 is integrated with the proximity sensor 32; the ambient light sensors 42 of the two fill light modules 40 are respectively arranged adjacent to the two side edges of the top plate 12 in the first direction X, and the second light sources 41 of the two fill light modules 40 are respectively arranged adjacent to the two side edges of the top plate 12 in the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0091] Through the above implementation, on the one hand, the sensing module 30 and the fill light module 40 can have a certain redundancy, so that when any sensing module 30 or any fill light module 40 fails, the other sensing module 30 or the other fill light module 40 can ensure the normal function, thereby improving the reliability of the finger vein collection device 1. On the other hand, the two sensing modules 30 and the two fill light modules 40 can also run synchronously, thereby improving the detection sensitivity of the finger 2 and the fill light effect.

[0092] like Figure 4 As shown, in one embodiment, the housing 10 further includes a plurality of support columns 16 spaced apart from each other, and the plurality of support columns 16 are connected between the bottom plate 11 and the top plate 12. The top and bottom ends of each support column 16 are fixedly connected to the top plate 12 and the bottom plate 11, respectively.

[0093] Through the above-mentioned embodiment, the overall structural strength of the housing 10 can be improved.

[0094] Continue to refer to Figure 4 As shown, in one embodiment, the top plate 12 is further provided with a plurality of positioning posts 17 extending in a direction toward the bottom plate 11, and the control circuit board 50 is provided with a plurality of positioning holes 54 corresponding to the plurality of positioning posts 17 and the plurality of supporting posts 16, and the positioning holes 54 are used for the positioning posts 17 or the supporting posts 16 to pass through. The cross-sectional shape of the positioning holes 54 is an ellipse.

[0095] For example, the number of support columns 16 may be 4, and they are respectively arranged adjacent to the 4 vertex corners of the control circuit board 50. The number of positioning columns 17 may be 4, and they are respectively arranged adjacent to the central area of ​​the control circuit board 50. The heights of the positioning columns 17 and the limiting columns may be different, for example, the height of the limiting column may be less than the height of the positioning columns 17. The control circuit board 50 may be provided with 8, and they are respectively arranged in one-to-one correspondence with the 4 support columns 16 and the 4 positioning columns 17, so as to allow the corresponding support columns 16 or positioning columns 17 to pass through, thereby realizing the limiting effect of the control circuit board 50 relative to the housing 10.

[0096] In addition, the cross-sectional shape of the support column 16 and the positioning column 17 can be circular, and by setting the positioning hole 54 to be elliptical, the support column 16 or the positioning column 17 can have a certain displacement space in the positioning hole 54, so that the control circuit board 50 can have a small displacement space relative to the middle frame 13. Therefore, after the control circuit board 50 is correspondingly inserted with the multiple support columns 16 and the multiple positioning columns 17, the external connector on the control circuit board 50 can be pushed into the through hole opened on the middle frame 13 through the aforementioned displacement space, so that the external connector can communicate with the external device.

[0097] Figure 8 The control timing diagram of the finger vein collection device 1 according to the embodiment of the present application is shown below. Figure 8 The control process of the vein collection device according to the embodiment of the present application is described.

[0098] Exemplarily, the control circuit board 50 is connected to the flexible optical sensor 20 through the DSPI protocol. The pixel matrix of the flexible optical sensor 20 includes multiple rows of pixels, each row of pixels is driven by a corresponding gate drive signal, for example, multiple rows of pixels can be driven by Gate1, Gate2...Gate400 respectively. The control process of the finger vein collection device 1 may include the following timing stages:

[0099] Power-on initialization stage: the flexible optical sensor 20 receives a power-on signal sent by the control circuit board 50 through the DSPI protocol;

[0100] One-time clearing stage: Based on the current frame, turn on the ALL GATE ON signal for 10ms to clear the residual image left when the previous frame was exposed;

[0101] Reset stage: receiving the Gate1, Gate2…Gate400 drive signals in sequence to turn on each row of pixels one by one. The duration of this stage is 20.8mm.

[0102] Common exposure stage: All row pixels are turned on, so that the entire optical sensor is in an exposure state to ensure that each pixel can collect light signals. This stage lasts for 4.4ms.

[0103] Image acquisition stage: receiving driving signals of Gate1, Gate2, ... Gate400 in sequence to turn on each row of pixels one by one, so that all rows of pixels of the flexible optical sensor 20 output the acquired signals in sequence. The duration of this stage is 20.8 mm.

[0104] Second clearing stage: Based on the current frame, turn on the ALL GATE ON signal for 10ms to clear the residual image left when the current frame is exposed; repeat this cycle to collect the next frame.

[0105] In the last 10 ms period of the reset phase, the signals collected by the first 200 rows of pixels are transmitted; and in the entire period of the secondary clearing phase, the signals collected by the last 200 rows of pixels are transmitted.

[0106] The other components of the finger vein collection device 1 of the above embodiment may adopt various technical solutions known to ordinary technicians in the field now and in the future, and will not be described in detail here.

[0107] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0108] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0109] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0110] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0111] It should be noted that although the various steps of the method in the present application are described in a specific order in the accompanying drawings, this does not require or imply that these steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps can be omitted, multiple steps can be combined into one step for execution, and / or one step can be decomposed into multiple steps for execution, etc. The above-mentioned drawings are only schematic illustrations of the processing included in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It is easy to understand that the processing shown in the above-mentioned drawings does not indicate or limit the time sequence of these processing. In addition, it is also easy to understand that these processing can be, for example, performed synchronously or asynchronously in multiple modules.

[0112] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0113] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A finger vein collection device, characterized in that: include: The housing has a top with an inwardly recessed receiving groove, and the bottom wall of the receiving groove is a curved surface; A flexible optical sensor, disposed on the bottom wall of the receiving groove, for detecting the vein of a finger placed in the receiving groove; a sensing module, disposed in the housing, comprising a first light source and a proximity sensor; the first light source is used to emit a sensing light to one side of the receiving groove; the proximity sensor is used to receive the reflected light of the finger to the sensing light, and output a first preset signal when the frequency of the reflected light meets a first preset condition; A fill light module is arranged in the housing, and comprises a second light source and an ambient light sensor; the ambient light sensor is used to detect the intensity of the ambient light, and output a second preset signal when the intensity of the ambient light meets a second preset condition; the second light source is used to emit a reinforcement light to one side of the receiving groove; A control circuit board is arranged in the shell and electrically communicates with the flexible optical sensor, the sensing module and the fill light module respectively; the control circuit board is configured to: control the ambient light sensor to turn on in response to the first preset signal; and control the second light source to turn on in response to the second preset signal.

2. The finger vein collection device according to claim 1, characterized in that: Also includes: A first flexible connection part, wherein a first connection end of the first flexible connection part is electrically connected to the first light source, the proximity sensor, the second light source and the ambient light sensor respectively, and a second connection end of the first flexible connection part is electrically connected to the control circuit board.

3. The finger vein collection device according to claim 2, characterized in that: The flexible optical sensor includes a first detection area and a second detection area adjacent to each other; the finger vein collection device also includes: Two second flexible connection parts, the first connection ends of the two second flexible connection parts are respectively connected to the first detection area and the second detection area in a one-to-one correspondence, and the second connection ends of the two second flexible connection parts are respectively electrically connected to the control circuit board.

4. The finger vein collection device according to claim 3, characterized in that: The control circuit board is provided with a first connector and a second connector, the first connector is connected to the second connection end of the first flexible connection part, and the second connector is connected to the second connection end of the second flexible connection part; the control circuit board is provided with a forbidden area around the first connector and / or the second connector.

5. The finger vein collection device according to claim 4, characterized in that: The second connector includes a retractable limiting column and a pressure plate, the second flexible connection portion is provided with a limiting hole adjacent to the second connection end, the retractable limiting column passes through the limiting hole, and the pressure plate is pressed on the second connection end of the second flexible connection portion.

6. The finger vein collection device according to claim 1, characterized in that: The first light source and the second light source are infrared light emitting diodes.

7. The finger vein collection device according to claim 1, characterized in that: The shell includes a bottom plate, a top plate and a middle frame, the bottom plate and the top plate are spaced apart, and the middle frame is connected between the bottom plate and the top plate; the surface of the top plate facing away from the bottom plate defines the accommodating groove; wherein the sensing module, the fill light module and the control circuit board are all arranged between the bottom plate and the top plate.

8. The finger vein collection device according to claim 7, characterized in that: The shell also includes a accommodating portion, which is arranged on a side of the top plate adjacent to the bottom plate, and the interior of the accommodating portion defines a first sub-cavity and a second sub-cavity spaced apart from each other, the first sub-cavity is used to accommodate the proximity sensor, and the second sub-cavity is used to accommodate the ambient light sensor.

9. The finger vein collection device according to claim 7, characterized in that: There are two sensing modules and two fill light modules respectively; the proximity sensors of the two sensing modules are respectively arranged adjacent to the two side edges of the top plate in the first direction, and the first light source of each sensing module is integrated with the proximity sensor; the ambient light sensors of the two fill light modules are respectively arranged adjacent to the two side edges of the top plate in the first direction, and the second light sources of the two fill light modules are respectively arranged adjacent to the two side edges of the top plate in the second direction, and the second direction is perpendicular to the first direction.

10. The finger vein collection device according to claim 7, characterized in that: The middle frame is connected to the top plate and the bottom plate respectively through snap-fit ​​structures.

11. The finger vein collection device according to claim 10, characterized in that: The shell also includes a plurality of support columns spaced apart from each other, and the plurality of support columns are connected between the bottom plate and the top plate.

12. The finger vein collection device according to claim 11, characterized in that: The top plate is also provided with a plurality of positioning columns extending in a direction toward the bottom plate, and the control circuit board is provided with a plurality of positioning holes corresponding one-to-one to the plurality of positioning columns and the plurality of supporting columns, and the positioning holes are used for the positioning columns or the supporting columns to pass through; wherein the cross-sectional shape of the positioning holes is an ellipse.

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