Portable fingerprint collection device for criminal investigation

Abstract

This solution provides a portable fingerprint acquisition device for criminal investigation, including a light source emitting component; a fingerprint multi-angle acquisition component, wherein the fingerprint multi-angle acquisition component includes a fingerprint acquisition channel and at least one reflector arranged around the fingerprint acquisition channel; a fingerprint channel cover placed on the fingerprint acquisition channel, wherein the fingerprint channel cover includes a brush roller and a brush arranged on the surface of the brush roller; an optical path acquisition component; and an image acquisition component; wherein the light source emitting component, the fingerprint multi-angle acquisition component, the optical path acquisition component, and the image acquisition component are sequentially designed on the fingerprint acquisition optical path, adopting a non-contact omnidirectional fingerprint acquisition structure, improving the accuracy and efficiency of fingerprint acquisition, and meeting the needs of criminal investigators for rapid evidence collection in mobile scenarios such as the field and crime scenes.

Description

Technical Field

[0001] This application relates to the field of fingerprint collection, and in particular to a portable fingerprint collection device for criminal investigation. Background Technology

[0002] As a unique biological characteristic of the human body, fingerprints play an irreplaceable role in criminal investigation, identity recognition, and other fields due to their stability and specificity.

[0003] Traditional fingerprint scanners mostly use a contact-based acquisition method, where a finger is pressed onto a collection surface (such as an optical prism or capacitive sensor surface) to acquire a fingerprint image from a single angle. However, this acquisition method has the following significant drawbacks:

[0004] 1. Incomplete information collection: Contact-based fingerprint collection can only capture the fingerprint texture of the area where the finger contacts the collection surface (mostly the front of the fingertip), while the texture of the fingertip edge, side and other parts is easily missed, resulting in missing fingerprint feature points and affecting the accuracy of subsequent comparisons; for fingers with shallow fingerprint texture, severe wear or wrinkles, images from a single perspective are even more difficult to meet the requirements of criminal investigation for details.

[0005] 2. Easily causes fingerprint contamination and deformation: During the contact collection process, sweat and oil on the surface of the fingers will remain on the collection surface, which not only contaminates the equipment, but may also interfere with subsequent collection; at the same time, uneven pressure may cause fingerprint pattern deformation, further reducing image quality.

[0006] In addition, while existing contactless fingerprint collection devices can avoid contact contamination, they mostly use a single lens or fixed-angle optical path design, which still makes it difficult to cover the full range of the finger's field of vision. Furthermore, the devices are large in size and lack portability, failing to meet the needs of criminal investigators for rapid evidence collection in mobile scenarios such as the field and crime scenes. Summary of the Invention

[0007] This application provides a portable fingerprint collection device for criminal investigation, which adopts a non-contact, omnidirectional fingerprint collection structure to improve the accuracy and efficiency of fingerprint collection and meet the needs of criminal investigators for rapid evidence collection in mobile scenarios such as the field and crime scenes.

[0008] To achieve the above objectives, this technical solution provides a portable fingerprint acquisition device for criminal investigation, including a light source emitting component; a fingerprint multi-angle acquisition component, wherein the fingerprint multi-angle acquisition component includes a fingerprint acquisition channel and at least one reflector arranged around the fingerprint acquisition channel; a fingerprint channel cover that is placed on the fingerprint acquisition channel, wherein the fingerprint channel cover includes a brush roller and a brush disposed on the surface of the brush roller; an optical path acquisition component; and an image acquisition component; wherein the light source emitting component, the fingerprint multi-angle acquisition component, the optical path acquisition component, and the image acquisition component are sequentially designed on the fingerprint acquisition optical path.

[0009] Compared with existing technologies, this technical solution has the following characteristics and beneficial effects:

[0010] 1. The fingerprint multi-angle acquisition component of this solution adopts a non-contact multi-angle acquisition design. By setting multiple right-angled triangular reflectors around the fingerprint acquisition channel, combined with the optical path acquisition component, it can achieve the acquisition of fingerprint images from all directions (front, side, and edge). This breaks through the limitations of traditional single-view acquisition, improves the integrity of fingerprint information through all-round acquisition, and avoids the omission of key features such as fingertip edges and creases by traditional single-view acquisition, thus providing more comprehensive feature point data for criminal investigation comparison.

[0011] 2. The fingerprint channel cover of this solution integrates the dual functions of cleaning the reflector and sealing the fingerprint acquisition channel. The fingerprint acquisition channel is dustproof and sealed by threaded connection and sealing gasket. At the same time, the reflector surface can be cleaned by tilting and rotating the brush roller to avoid contaminants affecting the imaging accuracy.

[0012] 3. The portable fingerprint collection device for criminal investigation in this solution has a compact overall structure and a real-time display function, making it convenient for criminal investigators to carry to the scene for real-time fingerprint collection. Attached Figure Description

[0013] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0014] Figure 1 This is a schematic diagram of the overall structure of a portable fingerprint collection device for criminal investigation provided in this solution.

[0015] Figure 2 This is a schematic diagram of a portable fingerprint collection device for criminal investigation provided in this solution.

[0016] Figure 3 This is a schematic diagram of the fingerprint multi-angle acquisition component provided in this solution.

[0017] In the diagram: 10-Fingerprint multi-angle acquisition component; 100-Fingerprint acquisition channel; 11-Reflector mounting bracket; 110-First channel; 111-Reflector mounting slot; 112-Mounting positioning component; 113-Mounting frame; 12-Reflector; 13-Fixing bracket; 131-Mounting positioning hole; 130-Second channel; 20-Fingerprint channel cover; 21-Cover body; 22-Brush roller; 23-Brush; 30-Optical path acquisition component; 31-Imaging lens group; 40-Image acquisition component; 41-Photosensitive chip; 50-Handle; 60-Display screen; 70-Outer shell. Detailed Implementation

[0018] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with one or more embodiments of this specification. Rather, they are merely examples of apparatuses and methods consistent with some aspects of one or more embodiments of this specification as detailed in the appended claims.

[0019] It should be noted that the steps of the corresponding methods are not necessarily performed in the order shown and described in this specification in other embodiments. In some other embodiments, the methods may include more or fewer steps than described in this specification. Furthermore, a single step described in this specification may be broken down into multiple steps in other embodiments; and multiple steps described in this specification may be combined into a single step in other embodiments.

[0020] Example 1

[0021] like Figures 1 to 3 As shown, this solution provides a portable fingerprint collection device for criminal investigation. This portable fingerprint collection device can collect images of the finger from all angles, thereby avoiding the problem of incomplete fingerprint information when collecting fingerprints from one side of the finger by traditional fingerprint collection devices. In addition, the fingerprint collection channel can be cleaned before fingerprint collection by the fingerprint channel cover, thereby ensuring the accuracy of the fingerprint information collected at the scene.

[0022] Specifically, the portable fingerprint collection device for criminal investigation includes:

[0023] Light source emitting assembly;

[0024] A fingerprint multi-angle acquisition component 10, wherein the fingerprint multi-angle acquisition component 10 includes a fingerprint acquisition channel 100 and at least one reflector 12 arranged around the fingerprint acquisition channel;

[0025] A fingerprint channel cover 20 is placed in the fingerprint acquisition channel 100, wherein the fingerprint channel cover 20 includes a brush roller 22 and a brush 23 disposed on the surface of the brush roller 22;

[0026] Optical path acquisition component 30; and

[0027] Image acquisition component 40;

[0028] The light source emitting component, the fingerprint multi-acquisition component 10, the optical path acquisition component 30 and the image acquisition component 40 are sequentially designed on the fingerprint acquisition optical path.

[0029] When fingerprints need to be collected, the target object places its fingerprint in the fingerprint collection channel 100 and turns on the light source emitting component (not shown in the figure) built into the portable fingerprint collection device. At this time, the light source emits light towards the fingerprint collection component 100. After passing through the collected fingerprint, the light is reflected to different reflectors 12 and then passes through the optical path collection component 30 and is collected by the image collection component 40, thereby realizing fingerprint collection.

[0030] In some embodiments, the light source emitting assembly includes an LED light source in a number equal to the number of reflectors, with an LED light source disposed on the side of each reflector and the illumination direction of the LED light source pointing toward the fingerprint area aligned with the reflector.

[0031] In other embodiments, the light source emitting assembly includes a ring light source array disposed at the entrance of the fingerprint acquisition channel 100. The ring light source array includes multiple LEDs corresponding to the reflectors. Each LED focuses light onto a specific area of ​​the fingerprint through a microlens (such as an aspherical lens) (e.g., the LED on the left side of the fingertip illuminates the left edge, and the LED on the right side illuminates the right edge). The emission angle of the LED is set at 30° to 45° with the normal direction of the corresponding reflector to ensure that the fingerprint reflected light is perpendicularly incident on the reflector.

[0032] Preferably, the light source of the light source emitting component is selected as near-infrared light or white light. Near-infrared light can penetrate the skin surface and enhance the contrast between the dermal texture and the epidermis, making it suitable for recognizing blurry or aged fingerprints. White light restores the true texture of the fingerprint and is suitable for most common scenarios. When used with a filter, the contrast can be further enhanced.

[0033] Regarding the fingerprint multi-angle acquisition component 10 in this solution:

[0034] like Figure 3 As shown, the multi-angle acquisition component 10 of this solution includes a reflector mounting bracket 11, a plurality of reflectors 12 installed in the reflector mounting bracket 11, and a fixing bracket 13 for fixing the reflector mounting bracket 11. The center positions of the reflector mounting bracket 11 and the fixing bracket 13 are connected to form a fingerprint acquisition channel 100, and the plurality of reflectors 12 are arranged around the fingerprint acquisition channel 100.

[0035] The reflector mounting bracket 11 of this solution includes a mounting frame 113, with a first channel 110 formed through the center of the mounting frame 113, and the mounting frame 113 is provided with a plurality of reflector mounting slots 111 arranged around the first channel 110, and the reflector mounting slots 111 and the first channel 110 are connected.

[0036] Specifically, the mounting frame 113 of this solution is designed as a frustum shape, and a cylindrical first channel 110 is formed through the central axis of the mounting frame 113. The mounting frame 113 is provided with a plurality of triangular mirror mounting slots 111 that are connected to the first channel 110.

[0037] Furthermore, in order to enable the light collected in the first channel 110 to be reflected by the reflector 12 and then collected by the optical path acquisition component 30, the reflector mounting slot 111 is designed as a right-angled triangle with open sides. The first right-angled side of each reflector mounting slot 111 is connected to the first channel 110, and the second right-angled side is positioned along the optical path relative to the optical path acquisition component 30. The advantage of this design is that the light collected in the first channel 110 can be reflected to the optical path acquisition component 30.

[0038] Of course, the shape of the reflector 12 matches the shape of the reflector mounting slot 111, and the reflector 12 is also a right-angled triangle. It should be noted that multiple reflector mounting slots 111 are arranged circumferentially on the reflector mounting bracket 11, but the number of reflectors 12 may be less than the number of reflector mounting brackets 11 depending on the actual requirements of the acquisition direction.

[0039] To assemble the fingerprint multi-angle acquisition component 10, the fingerprint multi-angle acquisition component 10 includes a fixing frame 13, wherein the fixing frame 13 and the reflector mounting frame 11 are fixed by a threaded nut, the reflector mounting frame 11 is fixed on the fixing frame 13, and the fixing frame 13 is connected to the housing 70, wherein the optical path acquisition component 30 and the image acquisition component 40 are both placed inside the housing 70.

[0040] In some embodiments, the mirror mounting bracket 11 is provided with a mounting positioning member 112, and the corresponding position of the fixing bracket 13 is also provided with a mounting positioning hole 131. When assembling the mirror mounting bracket 11 and the fixing bracket 13, the mounting positioning member 112 is set to the mounting positioning hole 131 and the two are fixed by nuts.

[0041] The mounting bracket 13 has a conductive second channel 130, wherein the first channel 110 and the second channel 130 are located on the same axis and are the same size and shape. The first channel 110 and the second channel 130 are connected to form a fingerprint acquisition channel 10. It is worth mentioning that, unlike the traditional method of fingerprint acquisition which requires pressing on the acquisition surface, this solution adopts a non-contact fingerprint acquisition method. That is, the person being acquired inserts their finger into the fingerprint acquisition channel 100 without touching any acquisition surface. The fingerprint is acquired simply by illuminating it with the light source of the light source emitting component, and the light source is reflected by the reflector 12 to the light source acquisition component 30.

[0042] Regarding the fingerprint channel cover 20 in this solution:

[0043] Although the portable fingerprint collection device for criminal investigation in this solution is a non-contact fingerprint collection method, if the fingerprint collection channel 100 is exposed to the environment for a long time, dust and other substances in the environment will enter the surface of the reflector, which will affect the accuracy of subsequent fingerprint collection. Therefore, this solution designs a fingerprint channel cover 20 that matches the fingerprint collection channel 100.

[0044] like Figure 2 As shown, the fingerprint channel cover 20 of this solution includes a cover body 21, a brush roller 22 connected to the cover body 21, and brushes 23 disposed around the brush roller 22. The size of the brush roller 22 is smaller than the size of the fingerprint acquisition channel 100. The length of the brushes 23 is designed such that when the brush roller 22 is inserted into the fingerprint acquisition channel 100, the edge of the brushes 23 matches the edge of the fingerprint acquisition channel 100. The advantage of this design is that when it is not necessary to clean the surface of the reflector 12, only the brush roller 22 needs to be inserted into the fingerprint acquisition channel 100. At this time, the cover body 21 covers the surface of the fingerprint acquisition channel 100 to prevent air pollutants from entering, but the brushes 23 do not contact the reflector 12. When it is necessary to clean the surface of the reflector 12, only the brush roller 22 needs to be tilted inside the fingerprint acquisition channel 100 so that part of the brushes 23 can contact the corresponding reflector 12 surface for cleaning. The brush roller 22 can be rotated to clean the reflectors 12 from different positions.

[0045] In some embodiments, the main outline of the cover 21 of the fingerprint channel cover 20 matches the entrance end of the fingerprint acquisition channel 100. The outer periphery of the fingerprint acquisition channel 100 is designed with external threads, and the edge of the cover 21 is provided with internal threads. By tightening, the gap between the cover 21 and the fingerprint acquisition channel 100 is compressed, effectively preventing dust and moisture from entering the fingerprint acquisition channel 100.

[0046] Furthermore, a flexible sealing gasket is provided around the outer periphery of the fingerprint acquisition channel 100 to ensure that it can fit tightly with the reflector mounting bracket 11 when the cover 21 is closed on the fingerprint acquisition channel 100.

[0047] Regarding the optical path acquisition component 30 in this solution:

[0048] The optical path acquisition component 30 of this solution is used to receive the fingerprint light signal reflected by the reflector 12. Specifically, the optical path acquisition component 30 includes an imaging lens group 31 for focusing the fingerprint light reflected by the reflector 12. Since the reflector 12 is arranged around the fingerprint acquisition channel 100, the imaging lens group 31 of this solution needs to match the optical path characteristics of multi-directional reflected light. A wide-angle lens or multiple sub-lenses can be used to correspond to the reflection direction of different reflectors to ensure that the fingerprint light at each angle can be effectively focused.

[0049] Furthermore, to better collect fingerprint reflections from different reflectors 12, the imaging lens group 31 of this solution includes an angle rotation structure and an optical lens mounted on the angle rotation component. The angle rotation structure rotates the lens to the optical path direction of the corresponding reflector to collect the corresponding fingerprint reflection. Correspondingly, the controller controls the angle rotation structure to rotate the lens sequentially to the optical path direction of the corresponding reflector based on the position of the reflector 12, in order to collect the fingerprint reflection from the current reflector.

[0050] Specifically, the angle rotation structure includes a micro motor connected to the controller and a rotating shaft connected to the output shaft of the micro motor. The lens is fixed at the top of the rotating shaft, and the rotation of the rotating shaft drives the rotation of the lens. Furthermore, in order to provide real-time feedback on the lens angle, a photoelectric encoder or Hall sensor is installed on the side of the rotating shaft to sense the rotation angle of the lens in real time.

[0051] In some embodiments, the lens is fixed to the top of the rotating shaft by a locking ring or a snap-fit ​​structure to ensure that the optical axis and the rotating shaft are coaxial.

[0052] Regarding the image acquisition component 40 in this solution:

[0053] The image acquisition component 40 of this solution receives the light signal focused by the optical path acquisition component 30 and converts it into an electrical signal (digital image data). In some embodiments, the image acquisition component 40 includes a photosensitive chip 41 corresponding to the optical path of the optical path acquisition component 30.

[0054] Preferably, the image sensor 41 should be a high-resolution sensor (CMOS or CCD), and the pixel density should meet the clarity requirements of fingerprint acquisition (usually not less than 500 dpi).

[0055] In addition, a display screen 60 is provided on the casing 70 of the portable fingerprint collection device for criminal investigation. The display screen 60 is connected to the image sensor 41 to display the fingerprint image collected by the image sensor 41 in real time.

[0056] Since the portable fingerprint collection device for criminal investigation in this solution can collect fingerprints from multiple angles, the display screen 60 can also display fingerprint images of the same finger from multiple different angles.

[0057] To facilitate carrying the portable fingerprint collection device for criminal investigation, a handle 50 is provided on the outer shell of the device, so that criminal investigators can easily carry it.

[0058] In summary, this portable fingerprint collection device for criminal investigation utilizes an innovatively designed multi-angle fingerprint acquisition component. By coordinating a reflector surrounding the fingerprint acquisition channel with the optical path acquisition component, it achieves non-contact acquisition of fingerprint images from all angles, effectively solving the problem of incomplete information caused by single-angle acquisition in traditional devices. Simultaneously, the integrated fingerprint channel cover, through a brush roller structure, can both seal the channel to isolate contaminants when not in use and flexibly clean the reflector surface, ensuring the clarity and accuracy of fingerprint images acquired on-site. The device features a compact design, equipped with a handle and display screen, balancing portability and intuitive operation, meeting the core needs of rapid, efficient, and comprehensive evidence collection at criminal investigation scenes. Its complete fingerprint information acquired from multiple angles provides more reliable data support for subsequent fingerprint comparison and case solving, demonstrating significant practical application value.

[0059] Those skilled in the art should understand that the technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A portable fingerprint collection device for criminal investigation, characterized in that, include: Light source emitting assembly; A fingerprint multi-angle acquisition component (10), wherein the fingerprint multi-angle acquisition component (10) includes a fingerprint acquisition channel (100) and at least one reflector (12) arranged around the fingerprint acquisition channel; A fingerprint channel cover (20) is placed in conjunction with the fingerprint acquisition channel (100), wherein the fingerprint channel cover (20) includes a brush roller (22) and a brush (23) disposed on the surface of the brush roller (22). Optical path acquisition component (30); and Image acquisition component (40); The light source emitting component, the fingerprint multi-angle acquisition component (10), the optical path acquisition component (30) and the image acquisition component (40) are sequentially designed on the fingerprint acquisition optical path.

2. The portable fingerprint collection device for criminal investigation according to claim 1, characterized in that, The light source emitting assembly includes a ring light source array disposed at the entrance of the fingerprint acquisition channel (100), wherein the ring light source array includes multiple LEDs corresponding to the reflectors.

3. The portable fingerprint collection device for criminal investigation according to claim 1, characterized in that, The multi-angle acquisition component (10) includes a reflector mounting bracket (11), a plurality of reflectors (12) installed in the reflector mounting bracket (11), and a fixing bracket (13) for fixing the reflector mounting bracket (11). The center of the reflector mounting bracket (11) and the fixing bracket (13) are connected to form a fingerprint acquisition channel (100), and the plurality of reflectors (12) are arranged around the fingerprint acquisition channel (100).

4. The portable fingerprint collection device for criminal investigation according to claim 3, characterized in that, The mirror mounting bracket (11) includes a mounting frame (113), with a first channel (110) formed through the center of the mounting frame (113), and the mounting frame (113) is provided with a plurality of mirror mounting slots (111) arranged around the first channel (110), and the mirror mounting slots (111) and the first channel (110) are connected.

5. The portable fingerprint collection device for criminal investigation according to claim 4, characterized in that, The reflector mounting slot (111) is designed as a right-angled triangle with two sides open. The first right-angled side of each reflector mounting slot (111) is open to the first channel (110), and the second right-angled side is set along the optical path relative to the position of the optical path acquisition component (30). The shape of the reflector (12) matches the shape of the reflector mounting slot (111).

6. The portable fingerprint collection device for criminal investigation according to claim 1, characterized in that, The fingerprint channel cover (20) includes a cover body (21), a brush roller (22) connected to the cover body (21), and a brush (23) disposed around the brush roller (22). The size of the brush roller (22) is smaller than the size of the fingerprint acquisition channel (100). The length of the brush (23) is designed such that when the brush roller (22) extends into the fingerprint acquisition channel (100), the edge of the brush (23) matches the edge of the fingerprint acquisition channel (100).

7. The portable fingerprint collection device for criminal investigation according to claim 6, characterized in that, The main outline of the cover (21) of the fingerprint channel cover (20) matches the entrance end of the fingerprint acquisition channel (100). The outer periphery of the fingerprint acquisition channel (100) is designed with external threads, and the edge of the cover (21) is set with internal threads.

8. The portable fingerprint collection device for criminal investigation according to claim 1, characterized in that, The optical path acquisition component (30) includes an imaging lens group (31) for focusing fingerprint light reflected by the reflector (12), and the imaging lens group (31) includes an angle rotation structure and an optical lens disposed on the angle rotation component.

9. The portable fingerprint collection device for criminal investigation according to claim 1, characterized in that, The housing (70), the optical path acquisition component (30) and the image acquisition component (40) are all placed inside the housing (70), and the display screen (60) is provided on the housing (70), wherein the display screen (60) and the image sensor (41) are connected.

10. The portable fingerprint collection device for criminal investigation according to claim 9, characterized in that, A handle (50) is provided on the outer casing (70).

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