Fingerprint and finger vein acquisition equipment

Abstract

The utility model discloses fingerprint and finger vein acquisition equipment, and belongs to the field of biological feature recognition. Comprising a shell, the top of the shell is sunken downwards to form a finger placing position with a set length, a fingerprint collector is arranged in the front section of the finger placing position, and the collecting face of the fingerprint collector is arranged upwards; a finger vein acquisition window is formed in the shell at the bottom of the rear section of the finger placement position, and a finger vein acquisition lens is arranged at the finger vein acquisition window in the shell; light supplementing windows are formed in the positions, on the two sides of the rear section of the finger placing position, of the shell, and near-infrared light supplementing lamps are arranged at the positions, at the light supplementing windows, of the interior of the shell. The device is simple in shape, small in size, convenient to carry and use and low in production cost.

Description

Technical Field

[0001] This application relates to the field of biometric identification, and in particular to a fingerprint and finger vein acquisition device. Background Technology

[0002] Biometric identification technologies use the body's physiological characteristics to identify individuals, including iris recognition, facial recognition, voiceprint technology, fingerprint recognition, finger vein recognition, palm print recognition, and palm vein recognition. Among these, finger vein recognition and fingerprint recognition are the most widely used biometric technologies. Because the blood flow in veins varies from person to person, finger veins, as an important identification feature, have advantages such as lifelong uniqueness, stability, non-invasiveness, and difficulty in replication.

[0003] Fingerprint and finger vein recognition technology is an emerging technology that verifies both fingerprints and finger veins simultaneously, offering advantages such as high accuracy and difficulty in forgery. Existing fingerprint and finger vein acquisition devices, due to the large number of components involved, result in complex designs, large sizes, and high production costs. Utility Model Content

[0004] To address the problems of existing technologies, this application provides a fingerprint and finger vein acquisition device that is simple in design, compact in size, easy to carry and use, and has low production costs.

[0005] The technical solution provided in this application is as follows:

[0006] A fingerprint and finger vein acquisition device includes a housing. The top of the housing is recessed downward to form a finger placement position of a predetermined length. A fingerprint collector is disposed in the front section of the finger placement position, with the acquisition surface of the fingerprint collector facing upward. A finger vein acquisition window is opened on the bottom of the rear section of the housing, and a finger vein acquisition lens is disposed inside the housing at the finger vein acquisition window. Supplemental lighting windows are opened on both sides of the rear section of the housing, and near-infrared supplemental lights are disposed inside the housing at the supplemental lighting windows.

[0007] Furthermore, infrared filters are provided on the acquisition window and the supplementary lighting window.

[0008] Furthermore, a reflector is provided inside the housing, which is located directly below the infrared filter of the acquisition window. The reflector is tilted, and the finger vein acquisition lens is horizontally positioned on one side of the reflector. The finger vein image is reflected by the reflector and then acquired by the finger vein acquisition lens.

[0009] Furthermore, the near-infrared supplementary light is located outside the infrared filter of the supplementary light window, and the light emission direction of the near-infrared supplementary light is towards the infrared filter of the supplementary light window; the optical axis of the near-infrared supplementary light is tilted upwards, forming a predetermined first angle with the horizontal direction.

[0010] Furthermore, the finger placement position forms a predetermined second angle with the horizontal plane along its length direction.

[0011] Furthermore, a finger detector is provided at the bottom of the finger placement position located behind the finger vein acquisition window.

[0012] Furthermore, the finger detector includes a detection metal plate, a portion of which is located inside the housing, and another portion is exposed inside and outside the housing;

[0013] Alternatively, the finger detector may include a pressure sensor.

[0014] Furthermore, a fingertip limiting block is provided at the front end of the finger placement position, and the fingertip limiting block has an arc-shaped structure.

[0015] Furthermore, the casing is equipped with a power indicator light, a signal indicator light, a USB port, and a speaker.

[0016] Furthermore, the side of the housing is provided with several outwardly protruding connecting protrusions, and the connecting protrusions are provided with connecting holes.

[0017] This application has the following beneficial effects:

[0018] In use, this application involves placing a finger in the finger placement area, collecting fingerprints via a fingerprint scanner at the front of the finger placement area, and simultaneously collecting finger veins at the rear. This application utilizes a finger placement area on the top of the housing, a fingerprint scanner at the front of the finger placement area for fingerprint collection, and a finger vein collection structure at the rear of the finger placement area for finger vein collection. Furthermore, near-infrared supplementary lighting is applied to both sides of the rear of the finger placement area for finger vein collection. This fingerprint and finger vein collection device features a simple design, compact size, ease of portability and use, and low production costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating an example of the fingerprint and finger vein acquisition device of this application;

[0020] Figure 2 This is a schematic diagram of another example of the fingerprint and finger vein acquisition device of this application;

[0021] Figure 3 This is a schematic diagram of the optical path for collecting finger vein images.

[0022] Figure 4 This is a schematic diagram illustrating yet another example of the fingerprint and finger vein acquisition device of this application;

[0023] Figure 5 for Figure 4 A sectional view. Detailed Implementation

[0024] To make the technical problems, technical solutions and advantages of this application clearer, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0025] This application provides a fingerprint and finger vein acquisition device, such as... Figure 1-5 As shown, the device includes a housing 1, with a downward-curving top forming a finger placement position 2. The finger placement position 2 is an elongated groove structure of a predetermined length. A fingerprint scanner 3 is disposed in the front section of the finger placement position 2. The fingerprint scanner 3 can be a capacitive fingerprint scanner or a semiconductor fingerprint scanner, etc., with its collecting surface facing upwards.

[0026] A finger vein acquisition window 4 is provided on the bottom rear section of the housing of the finger placement position 2. A finger vein acquisition lens 5 is provided inside the housing 1 at the finger vein acquisition window 4. The finger vein acquisition lens 5 has a CMOS sensor or similar sensor. A supplementary lighting window 6 is provided on both sides of the rear section of the housing of the finger placement position 2. A near-infrared supplementary light 7 is provided inside the housing 1 at the supplementary lighting window 6.

[0027] In use, finger 11 is placed in the finger placement position 2, and fingerprints are collected by the fingerprint collector 3 at the front of the finger placement position 2, while finger veins are simultaneously collected at the rear of the finger placement position 2. This application uses a finger placement position on the top of the housing, a fingerprint collector at the front of the finger placement position for fingerprint collection, and a finger vein collection structure at the rear of the finger placement position for finger vein collection. Furthermore, near-infrared supplementary lighting is applied to both sides of the rear of the finger placement position for finger vein collection. The fingerprint and finger vein collection device of this application has a simple design, is compact, easy to carry and use, and has low production costs.

[0028] To reduce the impact of ambient light on the image captured by finger vein imaging, infrared filters 8 and 9 are installed on the acquisition window 4 and the supplementary lighting window 6.

[0029] A reflector 10 is disposed inside the housing 1, located directly below the infrared filter 8 of the acquisition window 4. The reflector 10 is tilted, and the finger vein acquisition lens 5 is horizontally disposed to one side of the reflector 10, facing the reflector 10. The finger vein acquisition lens 5, the reflector 10, and the infrared filter 8 form a reflected light path. The finger vein image of the finger 11 is reflected by the reflector 10 and then acquired by the finger vein acquisition lens 5. Figure 3 As shown.

[0030] The near-infrared supplementary light 7 is located outside the infrared filter 9 of the supplementary light window 6, and the light emission direction of the near-infrared supplementary light 7 is towards the infrared filter 9 of the supplementary light window 6. Furthermore, the optical axis of the near-infrared supplementary light 7 is tilted upwards, forming a predetermined first angle with the horizontal direction.

[0031] like Figure 3 As shown, the near-infrared fill light 7 has an emission angle of 60°, and its optical axis is tilted upward at an angle of 15° to the horizontal direction, so that all the light from the near-infrared fill light 7 is tilted upward as much as possible to illuminate the effective area of ​​the finger.

[0032] The ergonomics of existing fingerprint and finger vein acquisition devices are flawed. They only consider the angles of the fingerprint and finger vein acquisition surfaces separately, without taking into account the actual state of the human finger during acquisition.

[0033] To address the aforementioned issues, this application comprehensively considers the actual state of the human finger during data collection, and sets the finger placement position 2 at a predetermined second angle to the horizontal plane along its length. During human data collection, the fingers are used almost in a straight line, and the fingers naturally form an angle of 5-10° with the horizontal plane. This application, by tilting the finger placement position 2, adapts to the actual finger position during data collection, thus conforming to ergonomics. Preferably, the value of the second angle is within the range of 5-10°.

[0034] To detect whether a finger 11 is present in the finger placement position 2, this application provides a finger detector 12 at the bottom of the finger placement position 2 located behind the finger vein acquisition window 4.

[0035] Existing technologies typically use photoelectric sensors or distance sensors for finger detection, which suffer from drawbacks such as insensitive detection and unstable signals. Furthermore, the sensors in existing finger detection technologies are housed within an inner casing, making assembly complex.

[0036] In one example, such as Figure 1-2 As shown, the finger detector 12 of this application includes a detection metal piece, part of which is located inside the housing, and the other part is exposed inside and outside the housing 1. The exposed detection metal piece is pressed down by the finger 11 to detect the presence of a finger, resulting in more sensitive detection, a more stable signal, and simpler assembly.

[0037] In another example, such as Figure 4 , 5 As shown, the finger detector of this application includes a pressure sensor, which can be a bridge-type pressure sensor, etc.

[0038] The pressure applied during finger vein image acquisition has a significant impact on the image quality. Pressing the finger too hard can obstruct blood flow in the blood vessels, resulting in poor image quality. Furthermore, since the pressure applied during each vein image acquisition varies, the image quality of the same finger can differ, and significant differences can lead to a decrease in the matching success rate.

[0039] This application places a pressure sensor at the bottom of the finger placement area (i.e., at the base of the finger) behind the finger vein acquisition window. During finger vein image acquisition, the sensor judges the pressure applied by the finger to determine if the base of the finger is properly positioned on the acquisition window. It acquires finger vein images when the pressure is normal, and stops acquiring vein images when the pressure falls below a predetermined range. This improves the quality of the acquired finger vein images, ensures consistency across acquisitions, and enhances the accuracy of fingerprint and finger vein recognition.

[0040] Specifically, if the pressure value is too high, the user is notified to reduce the pressure. If there is no pressure value or the pressure value is too low, the user is reminded to place the base of their finger against the pressure sensor of the finger vein acquisition window. If the pressure value is appropriate, the finger vein image is acquired through the finger vein acquisition lens 5 and stored or sent to a connected host computer or other devices.

[0041] In addition, during the acquisition of finger vein images, ambient light and internal reflected light from the device can affect the image quality. This application detects that when the pressure value is within the set pressure range, the finger is completely in contact with the finger vein acquisition window. In this state, the finger completely covers the finger vein acquisition window, minimizing the impact of ambient light and internal reflected light from the device on the image quality and improving the accuracy of fingerprint finger vein recognition.

[0042] A fingertip limiting block 13 may be provided at the front end of the finger placement position 2. The fingertip limiting block 13 has an arc-shaped structure that matches the shape of the fingertip. The fingertip limiting block 13 is used to limit the maximum frontal position that the finger 11 can reach within the finger placement position 2, so that the position of the finger 11 is suitable for fingerprint and finger vein collection.

[0043] The housing 1 can also be equipped with a power indicator light 14, a signal indicator light 15, a USB interface 16, and a speaker 17 to realize various expansion functions.

[0044] Existing fingerprint and finger vein acquisition devices have a single assembly method, only allowing for embedded assembly, and cannot be used independently as desktop devices. This application features a compact structural design, enabling it to be used as a standalone desktop device on various support platforms such as desktops. Figure 1 , 4As shown. An anti-slip pad 18 can be provided on the bottom surface of the housing 1 to prevent slipping when used on a desktop.

[0045] Alternatively, this application can also be used as an embedded device. When used as an embedded device, the sides of the housing 1 are provided with several outwardly protruding connecting protrusions 19, and the connecting protrusions 19 are provided with connecting holes 20 for connection during embedding. Figure 2 As shown.

[0046] In addition, when this application is used as an embedded and desktop device, all other components are the same except that the embedded housing 1 has a connecting protrusion 19. Embedded and desktop devices can share a large number of parts, and many parts do not need to be designed independently. With fewer parts, the production cost is low, and it is low-carbon and environmentally friendly.

[0047] The fingerprint collector 3, finger vein acquisition lens 5, near-infrared supplementary light 7, finger detector 12, and speaker 17 mentioned above are connected to and controlled by the control module 21. The control module 21 controls the fingerprint collector 3 to acquire fingerprint images via the SPI interface, controls the finger vein acquisition lens 5 to acquire finger vein images via the MIPI interface, obtains the pressure value of the pressure sensor via the I2C interface, and issues various prompts in voice form through the speaker 17.

[0048] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles described in this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A fingerprint and finger vein acquisition device, characterized in that, The device includes a housing with a downwardly recessed top forming a finger placement area of ​​a predetermined length. A fingerprint scanner is installed in the front section of the finger placement area, with the scanning surface of the fingerprint scanner facing upwards. A finger vein scanning window is provided on the bottom of the rear section of the housing, and a finger vein scanning lens is installed inside the housing at the finger vein scanning window. Supplemental lighting windows are provided on both sides of the rear section of the housing, and near-infrared supplemental lights are installed inside the housing at the supplemental lighting windows. Infrared filters are provided on the acquisition window and the supplementary lighting window; A reflector is provided inside the housing. The reflector is located directly below the infrared filter of the acquisition window. The reflector is tilted. The finger vein acquisition lens is horizontally positioned on one side of the reflector. The finger vein image is reflected by the reflector and then acquired by the finger vein acquisition lens. The near-infrared supplementary light is located outside the infrared filter of the supplementary light window, and the light emission direction of the near-infrared supplementary light is towards the infrared filter of the supplementary light window; the optical axis of the near-infrared supplementary light is tilted upwards at an angle of 15° to the horizontal direction.

2. The fingerprint and finger vein acquisition device according to claim 1, characterized in that, The finger placement position forms a predetermined second angle with the horizontal plane along its length direction.

3. The fingerprint and finger vein acquisition device according to claim 2, characterized in that, A finger detector is provided at the bottom of the finger placement position located behind the finger vein acquisition window.

4. The fingerprint and finger vein acquisition device according to claim 3, characterized in that, The finger detector includes a detection metal plate, part of which is located inside the housing and the other part is exposed inside and outside the housing; Alternatively, the finger detector may include a pressure sensor.

5. The fingerprint and finger vein acquisition device according to claim 4, characterized in that, The finger placement position is provided with a fingertip limiting block at the front end, and the fingertip limiting block has an arc-shaped structure.

6. The fingerprint and finger vein acquisition device according to claim 5, characterized in that, The casing is equipped with a power indicator light, a signal indicator light, a USB port, and a speaker.

7. The fingerprint and finger vein acquisition device according to claim 6, characterized in that, The sides of the housing are provided with several outwardly protruding connecting protrusions, and the connecting protrusions are provided with connecting holes.

Images