Intelligent door lock with fingerprint wet state recognition module

Abstract

The utility model discloses a kind of intelligent door lock with fingerprint wet state identification module, belong to intelligent door lock technical field.This kind of intelligent door lock with fingerprint wet state identification module, including lock body, lock body is close to the inside of bottom end and is provided with optical fingerprint collection window;Lock body is located in the inside of optical fingerprint collection window one side and is equipped with built-in light source for emitting probe light;Lock body is located in the inside of optical fingerprint collection window bottom end and is equipped with optical image sensor for capturing reflected light signal;The signal output end of optical image sensor is connected with the signal input end of fingerprint identification module, and fingerprint identification module is used to process the light signal transmitted by optical image sensor to identify fingerprint;The inside of lock body is provided with central control unit;The input end of central control unit is electrically connected with the output end of fingerprint identification module, and the utility model can effectively realize the accurate collection and identification of wet state fingerprint, with higher practical value.

Description

Technical Field

[0001] This utility model relates to the field of smart door lock technology, specifically a smart door lock with a fingerprint wet recognition module. Background Technology

[0002] Smart locks are a new type of lock that integrates electronic technology, biometric technology, and mechanical structure. Compared to traditional mechanical locks, they eliminate the reliance on physical keys, unlocking via electronic methods such as fingerprints, passwords, and card swipes. They are widely used in homes, apartments, and offices. Their core components include the lock body, an identity recognition module (such as fingerprint or password recognition), a central control unit, and an actuator (such as the lock cylinder drive module). During operation, the recognition module verifies the user's identity, and after the central control unit's judgment, it drives the actuator to complete the lock cylinder opening and closing action. Smart locks not only improve unlocking convenience but also feature anti-pry alarms and temporary authorization functions, better balancing security and flexibility, making them an important part of modern home and office security.

[0003] Based on the above, the inventors have discovered the following problems: In actual use, when the user's fingers are wet (such as after washing hands without drying them, after rain, or after exercising with sweat), the fingerprint recognition success rate of current smart door locks drops significantly or even fails completely. Traditional fingerprint recognition modules mostly rely on capacitive acquisition principles. Sweat and water stains on the surface of the fingers will form a conductive layer, interfering with the acquisition and recognition of capacitive signals, resulting in the inability to accurately capture fingerprint patterns and affecting the user experience.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a smart door lock with a fingerprint wet recognition module in order to achieve a more practical value. Utility Model Content

[0005] The purpose of this invention is to provide a smart door lock with a fingerprint wet recognition module to solve the problems mentioned in the background art.

[0006] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0007] A smart door lock with a wet fingerprint recognition module includes a lock body. An optical fingerprint acquisition window is located inside the lock body near its bottom. A built-in light source for emitting detection light is installed inside the lock body on one side of the optical fingerprint acquisition window. An optical image sensor for capturing reflected light signals is installed inside the lock body at the bottom of the optical fingerprint acquisition window. The signal output terminal of the optical image sensor is connected to the signal input terminal of the fingerprint recognition module, which processes the light signal transmitted by the optical image sensor to identify fingerprints. A central control unit is located inside the lock body. The input terminal of the central control unit is electrically connected to the output terminal of the fingerprint recognition module.

[0008] Furthermore, the fingerprint recognition module receives the detection light emitted by the built-in light source through the optical fingerprint acquisition window; the fingerprint recognition module captures the reflected light signal through the optical image sensor.

[0009] The beneficial effects of adopting the above-mentioned further solution are that, relying on the optical fingerprint acquisition window, the fingerprint recognition module can concentrate the detection light of the built-in light source on the fingerprint area of ​​the finger, reduce the dispersion and loss of light signals, and ensure that the light can fully cover the grooves and protrusions of the fingerprint; by directly capturing the reflected light signal through the optical image sensor, the transmission distance of the light signal is shortened, the influence of external interference on the signal is reduced, and the fingerprint image obtained by the sensor is clearer and more detailed, providing high-quality initial data for subsequent fingerprint processing and recognition, and further improving the success rate of wet fingerprint recognition; the detection light emitted by the built-in light source shines on the finger to be recognized through the optical fingerprint acquisition window, and the reflected light signal after being reflected by the finger is captured by the optical image sensor, which then transmits the captured light signal to the fingerprint recognition module.

[0010] Furthermore, the fingerprint recognition module includes a fingerprint image processing module, a fingerprint feature extraction module, and a fingerprint feature comparison module. The fingerprint image processing module is used to process the initial fingerprint image, the fingerprint feature extraction module is used to extract fingerprint features, and the fingerprint feature comparison module is used to compare the extracted fingerprint features with a preset stored legitimate fingerprint feature database.

[0011] The beneficial effect of adopting the above-mentioned further solution is that the detection light emitted by the built-in light source shines on the finger to be identified through the optical fingerprint acquisition window. The reflected light signal after being reflected by the finger is captured by the optical image sensor and converted into an initial fingerprint image. The fingerprint image processing module performs grayscale correction, defogging and de-reflection processing on the initial fingerprint image to eliminate light spot interference caused by moisture on the surface of the wet finger and extract a clear fingerprint ridge contour. The fingerprint feature extraction module extracts a set of fingerprint feature points based on the endpoints, bifurcation points, inflection points and other features of the ridge contour. The fingerprint feature comparison module compares the extracted set of fingerprint feature points with the preset stored legal fingerprint feature library, generates a signal of matching pass or matching failure based on the comparison result, and transmits the matching result to the central control unit to complete the optical fingerprint recognition process.

[0012] Furthermore, a password touch screen is provided on one side of the outer wall of the lock body, and the password signal output terminal of the password touch screen is electrically connected to the password signal input terminal of the central control unit.

[0013] The beneficial effects of adopting the above-mentioned further solutions are that the password touch screen, as an alternative to fingerprint unlocking, can meet the needs of different scenarios. For example, when a user's finger is injured and fingerprints cannot be collected, password unlocking can effectively make up for the limitations of fingerprint recognition. The password signal is directly transmitted to the central control unit, and after rapid verification, it can control the door lock opening and closing, making the operation convenient.

[0014] Furthermore, a lock cylinder is provided inside the lock body, and a lock cylinder motor drive module is provided inside the lock body. The control terminal of the lock cylinder motor drive module is electrically connected to the output terminal of the central control unit, and the lock cylinder motor drive module is used to drive the lock cylinder switch.

[0015] The beneficial effect of adopting the above-mentioned further solution is that after the central control unit receives a valid fingerprint or correct password signal, it sends a control command to the lock cylinder motor drive module. The lock cylinder motor drive module can accurately control the operation of the lock cylinder motor, driving the lock cylinder to complete the unlocking or locking action without manual operation, thus improving the convenience of use.

[0016] Furthermore, a power conversion module is provided inside the lock body. A power module is provided on one side of the lock body located on the power conversion module. The input terminal of the power conversion module is connected to the mains power, and the output terminal of the power conversion module is connected to the power module and the central control unit respectively.

[0017] The beneficial effects of adopting the above-mentioned further solutions are that the power conversion module can convert the mains power into the voltage required by each component of the smart lock (such as the working voltage of the central control unit and the fingerprint recognition module), providing a stable real-time power supply for the smart lock; the power module (such as the backup battery) can automatically take over the power supply when the mains power is interrupted, ensuring that the smart lock will not be unusable due to power outages, solving users' concerns about unlocking during power outages, and the dual power supply guarantee allows the smart lock to operate stably in various power environments, improving the reliability of use.

[0018] Furthermore, a handle is provided on the outer wall of the lock body.

[0019] The beneficial effect of adopting the above-mentioned further solution is that after the central control unit verifies and drives the lock cylinder to unlock, the user can easily complete the door opening action by holding the handle.

[0020] Compared with existing technologies, the advantages of this invention are as follows: This smart door lock with a wet fingerprint recognition module uses an optical fingerprint acquisition window with a built-in light source to penetrate sweat and water stains on the surface of the finger, allowing the detection light to stably illuminate the fingerprint ridge area; the optical image sensor can accurately capture the light signal reflected by the fingerprint ridge, and can clearly acquire fingerprint images even when the finger is wet, avoiding acquisition failure due to water obstruction; the fingerprint recognition module receives the light signal, processes it, and then transmits the result to the central control unit, forming a complete process of acquisition, processing, and judgment, ensuring the stability and accuracy of fingerprint recognition in wet conditions, realizing accurate acquisition and recognition of wet fingerprints, and solving the pain point of traditional smart door locks being unable to recognize wet hands. Attached Figure Description

[0021] Figure 1 A three-dimensional structural diagram of a smart door lock with a fingerprint wet recognition module provided by this utility model;

[0022] Figure 2 A partial side cross-sectional view of a smart door lock with a fingerprint wet recognition module provided by this utility model;

[0023] Figure 3 This utility model provides a system framework for a smart door lock with a fingerprint wetness recognition module. Figure 1 ;

[0024] Figure 4 A system block diagram of the fingerprint recognition module of a smart door lock with a wet fingerprint recognition module provided by this utility model;

[0025] Figure 5 This utility model provides a system framework for a smart door lock with a fingerprint wetness recognition module. Figure 2 .

[0026] In the diagram: 1. Lock body; 2. Lock cylinder; 3. Handle; 4. Password touch screen; 5. Optical fingerprint acquisition window; 6. Built-in light source; 7. Optical image sensor; 8. Fingerprint recognition module; 801. Fingerprint image processing module; 802. Fingerprint feature extraction module; 803. Fingerprint feature comparison module; 9. Central control unit; 10. Lock cylinder motor drive module; 11. Power supply module. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1-5This utility model provides a technical solution: a smart door lock with a fingerprint wet recognition module, including a lock body 1. The lock body 1 has an optical fingerprint acquisition window 5 near its bottom. A built-in light source 6 for emitting detection light is installed inside the lock body 1 on one side of the optical fingerprint acquisition window 5. An optical image sensor 7 for capturing reflected light signals is installed inside the lock body 1 at the bottom of the optical fingerprint acquisition window 5. The signal output terminal of the optical image sensor 7 is connected to the signal input terminal of a fingerprint recognition module 8, which processes the light signal transmitted by the optical image sensor 7 to identify fingerprints. A central control unit 9 is installed inside the lock body 1. The input terminal of the central control unit 9 is electrically connected to the output terminal of the fingerprint recognition module 8. The fingerprint recognition module 8 receives the detection light emitted by the built-in light source 6 through the optical fingerprint acquisition window 5. The fingerprint recognition module 8 captures reflected light signals through the optical image sensor 7. The fingerprint recognition module 8 includes a fingerprint image processing module 801, a fingerprint feature extraction module 802, and a fingerprint feature comparison module 803. The fingerprint image processing module 801 processes the initial fingerprint image, and the fingerprint feature extraction module 802... The fingerprint feature comparison module 803 is used to extract fingerprint features and compare the extracted fingerprint features with a preset stored database of legitimate fingerprint features. The optical fingerprint acquisition window 5, in conjunction with the built-in light source 6, can penetrate sweat and water stains on the finger surface, allowing the detection light to stably illuminate the fingerprint ridge area. The optical image sensor 7 can accurately capture the light signal reflected from the fingerprint ridge, clearly acquiring the fingerprint image even when the finger is wet, avoiding acquisition failure due to moisture obstruction. The reflected light signal after being reflected by the finger is captured by the optical image sensor 7 and converted into an initial fingerprint image. The image processing module 801 performs grayscale correction, dehazing, and de-reflection processing on the initial fingerprint image to eliminate light spot interference caused by moisture on the wet finger surface and extract a clear fingerprint ridge contour. The fingerprint feature extraction module 802 extracts a set of fingerprint feature points based on the endpoints, bifurcation points, and turning points of the ridge contour. The fingerprint feature comparison module 803 compares the extracted set of fingerprint feature points with a preset stored legal fingerprint feature database, generates a signal indicating whether the match is successful or unsuccessful based on the comparison result, and transmits the matching result to the central control unit 9 to complete the optical fingerprint recognition process.

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figures 1-5This utility model provides a technical solution: a password touch screen 4 is provided on one side of the outer wall of the lock body 1. The password signal output terminal of the password touch screen 4 is electrically connected to the password signal input terminal of the central control unit 9. A lock cylinder 2 is provided inside the lock body 1. A lock cylinder motor drive module 10 is provided inside the lock body 1. The control terminal of the lock cylinder motor drive module 10 is electrically connected to the output terminal of the central control unit 9. The lock cylinder motor drive module 10 is used to drive the lock cylinder 2 to switch. A power conversion module is provided inside the lock body 1. A power module 11 is provided on one side of the lock body 1 located at the power conversion module. The input terminal of the power conversion module is connected to the mains power. The output terminal of the power conversion module is connected to the power module 11 and the central control unit 9 respectively. The outer wall is equipped with a handle 3; the password touch screen 4 serves as an alternative to fingerprint unlocking, meeting the needs of different scenarios. For example, when a user's finger is injured and fingerprints cannot be collected, password unlocking can effectively compensate for the limitations of fingerprint recognition; the password signal is directly transmitted to the central control unit 9, and after quick verification, it can control the door lock opening and closing, making operation convenient; after receiving a valid fingerprint or correct password signal, the central control unit 9 sends a control command to the lock cylinder motor drive module 10, which can accurately control the operation of the lock cylinder motor, driving the lock cylinder 2 to complete the unlocking action without manual operation, improving ease of use; after the central control unit 9 verifies and drives the lock cylinder 2 to unlock, the user can easily open the door by holding the handle 3.

[0031] Specifically, the working principle of this smart door lock with a wet fingerprint recognition module is as follows: During use, the optical fingerprint acquisition window 5, in conjunction with the built-in light source 6, can penetrate sweat and water stains on the finger surface, allowing the detection light to stably illuminate the fingerprint ridge area. The optical image sensor 7 can accurately capture the light signal reflected from the fingerprint ridge, clearly acquiring the fingerprint image even when the finger is wet, avoiding acquisition failure due to moisture obstruction. The reflected light signal after being reflected by the finger is captured by the optical image sensor 7 and converted into an initial fingerprint image. The fingerprint image processing module 801 performs grayscale correction, defogging, and de-reflection processing on the initial fingerprint image, eliminating light spot interference caused by moisture on the wet finger surface and extracting a clear fingerprint ridge contour. The fingerprint feature extraction module 802 extracts a set of fingerprint feature points based on the endpoints, bifurcation points, and turning points of the ridge contour. The fingerprint feature comparison module 803 compares the extracted fingerprint features... The fingerprint sensor is compared with a pre-stored database of valid fingerprint features. Based on the comparison result, a signal indicating a successful or unsuccessful match is generated and transmitted to the central control unit 9 to complete the optical fingerprint recognition process. After receiving a valid fingerprint, the central control unit 9 sends a control command to the lock cylinder motor drive module 10. The lock cylinder motor drive module 10 can precisely control the operation of the lock cylinder motor, driving the lock cylinder 2 to complete the unlocking action without manual operation, thus improving ease of use. After the central control unit 9 verifies and drives the lock cylinder 2 to unlock, the user can easily open the door by holding the handle 3. The password touch screen 4 serves as another unlocking method besides fingerprint unlocking, meeting the needs of different scenarios. For example, when a user's finger is injured and fingerprints cannot be collected, password unlocking can effectively compensate for the limitations of fingerprint recognition. The password signal is directly transmitted to the central control unit 9, and after rapid verification, the door lock can be controlled, making operation convenient.

[0032] It should be noted that all standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. Furthermore, since this application is mainly used to protect mechanical devices, the control methods and circuit connections will not be explained in detail in this application.

Claims

1. A smart door lock with a fingerprint wet-state recognition module, characterized in that, The lock body (1) includes an optical fingerprint acquisition window (5) located inside near the bottom; a built-in light source (6) for emitting detection light is installed inside the lock body (1) on one side of the optical fingerprint acquisition window (5); an optical image sensor (7) for capturing reflected light signals is installed inside the lock body (1) at the bottom of the optical fingerprint acquisition window (5); the signal output terminal of the optical image sensor (7) is connected to the signal input terminal of the fingerprint recognition module (8), and the fingerprint recognition module (8) is used to process the light signal transmitted by the optical image sensor (7) to identify fingerprints; a central control unit (9) is provided inside the lock body (1); the input terminal of the central control unit (9) is electrically connected to the output terminal of the fingerprint recognition module (8).

2. The smart door lock with a fingerprint wet recognition module according to claim 1, characterized in that, The fingerprint recognition module (8) receives the detection light emitted by the built-in light source (6) through the optical fingerprint acquisition window (5); the fingerprint recognition module (8) captures the reflected light signal through the optical image sensor (7).

3. A smart door lock with a fingerprint wet-state recognition module according to claim 2, characterized in that, The fingerprint recognition module (8) includes a fingerprint image processing module (801), a fingerprint feature extraction module (802), and a fingerprint feature comparison module (803). The fingerprint image processing module (801) is used to process the initial fingerprint image, the fingerprint feature extraction module (802) is used to extract fingerprint features, and the fingerprint feature comparison module (803) is used to compare the extracted fingerprint features with a preset stored legal fingerprint feature library.

4. A smart door lock with a fingerprint wet recognition module according to claim 1, characterized in that, A password touch screen (4) is provided on one side of the outer wall of the lock body (1), and the password signal output terminal of the password touch screen (4) is electrically connected to the password signal input terminal of the central control unit (9).

5. A smart door lock with a fingerprint wet recognition module according to claim 4, characterized in that, The lock body (1) is provided with a lock cylinder (2) inside. The lock body (1) is provided with a lock cylinder motor drive module (10) inside. The control end of the lock cylinder motor drive module (10) is electrically connected to the output end of the central control unit (9). The lock cylinder motor drive module (10) is used to drive the lock cylinder (2) to switch.

6. A smart door lock with a fingerprint wet recognition module according to claim 5, characterized in that, The lock body (1) is equipped with a power conversion module. The lock body (1) has a power module (11) on one side of the power conversion module. The input end of the power conversion module is connected to the mains power, and the output end of the power conversion module is connected to the power module (11) and the central control unit (9) respectively.

7. A smart door lock with a fingerprint wet recognition module according to claim 6, characterized in that, The outer wall of the lock body (1) is provided with a handle (3).

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