WO2024001797A1

WO2024001797A1 - Identification device and electronic device

Info

Publication number: WO2024001797A1
Application number: PCT/CN2023/100287
Authority: WO
Inventors: 施祖传; 李战涛; 蔡奇; 叶海水
Original assignee: 华为技术有限公司
Priority date: 2022-06-28
Filing date: 2023-06-14
Publication date: 2024-01-04
Also published as: CN117351527A

Abstract

The present application provides an identification device (100) and an electronic device. The identification device (100) comprises a light-emitting module (10), a reflection module (20) and a camera module (30). The light-emitting module (10) emits infrared light which is irradiated to a finger (200), and is scattered via the finger (200) to form an incident light beam. The reflection module (20) reflects the incident light beam to form an imaging light beam, and irradiates the imaging light beam to the camera module (30). The camera module (30) receives the imaging light beam to form an infrared image of finger veins for identification. The reflection surface (21) of the reflection module (20) can be a plane. A first included angle can be formed between the reflection surface (21) and the horizontal plane, the first included angle being less than 45 degrees. The size of the identification device (100) in the thickness direction is reduced, and the identification device (100) is thus miniaturized and thinned.

Description

An identification device and electronic equipment

This application claims priority to the Chinese patent application filed with the China Patent Office on June 28, 2022, with application number 202210742856.0 and application title "An identification device and electronic equipment", the entire content of which is incorporated into this application by reference. .

Technical field

The embodiments of the present application relate to the technical field of electronic equipment, and in particular, to an identification device and an electronic equipment.

Background technique

Biometric identification technology uses automatic technology to measure the biological characteristics of the human body based on identity authentication requirements, and compares them with characteristic templates collected or entered in advance to complete identity verification. Biometric characteristics refer to unique, measurable or identifiable physiological characteristics, such as fingerprints, faces, irises, veins, etc. Among them, finger veins are an emerging biometric feature, which has the advantages of fast recognition speed, high accuracy, living body recognition, in-body characteristics, non-contact, and high user acceptance.

The principle of vein recognition is: the hemoglobin in the veins has the characteristics of absorbing infrared rays. At the same time, other tissues of the fingers, such as muscles and dermis, absorb less infrared rays. Therefore, when the fingers are irradiated with infrared light, a dark vein image can be formed. Medical research shows that each person’s finger vein network characteristics are unique, making them capable of becoming identity authentication features. Currently, the vein identification device includes an infrared light source, an infrared filter and a camera. As shown in Figure 1, the infrared light source can emit narrow-wave infrared light. The infrared light will be scattered when it shines on the finger, and part of the infrared light will shine through the finger to the camera. , the camera receives the infrared light to form an infrared image of the finger, and the veins in the finger have strong infrared absorption and will show dark stripes, so an image of the vein pattern can be obtained, which becomes an identifiable feature.

However, due to the large object distance required for clear imaging, the thickness of the identification device is large, which is not conducive to the thinning and miniaturization of the identification device.

Contents of the invention

Embodiments of the present application provide an identification device and electronic equipment, which solve the problem that the existing identification device has a large thickness and is not conducive to the thinning and miniaturization design of the identification device.

The first aspect of the application provides an identification device, including: a light-emitting module, a reflective module and a camera module. The reflective module includes a reflective surface. The light-emitting module is used to emit infrared light. The infrared light is scattered by the object to be measured to form an incident beam. The reflection The surface is used to reflect the incident beam to form an imaging beam, and the camera module is used to receive the imaging beam to form an infrared image of the object to be measured. The reflection module realizes the refraction of the optical path between the object to be measured (such as a finger) and the camera module, which can reduce the length of the object distance in the thickness direction, thereby reducing the thickness of the recognition device.

Wherein, the reflective surface is a plane, the reflective surface is inclined to the horizontal plane, and the reflective surface and the horizontal plane form a first included angle, and the first included angle is less than 45°. Under the condition that imaging is satisfied, the smaller the value of the first included angle α, the smaller the distance from the end of the reflective module away from the finger to the finger (or the light-emitting module), so the value of the first included angle α is smaller than 45°. It can further reduce the size of the entire identification device in the thickness direction, achieving miniaturization and reduction of the identification device. Thinning.

In a possible implementation, the first included angle α satisfies: α=45°-b, where 0°<b≤10°. It helps to ensure the imaging performance of the recognition device, meet the imaging quality requirements, and improve the accuracy of the recognition device while reducing the thickness of the recognition device.

In a possible implementation, 0°<b≤5°. The identification device can have a smaller thickness and better imaging performance, while meeting high imaging quality and miniaturization and thinning design requirements.

In a possible implementation, the optical axis of the camera module is tilted to the horizontal plane, the optical axis and the horizontal plane form a second included angle, and the second included angle β satisfies: β=2b. It is conducive to meeting the paraxial conditions of imaging of the camera module, thereby improving the quality of imaging and improving the accuracy of the identification device.

In a possible implementation manner, the reflection module at least includes a reflection mirror, that is, the reflection module can be composed of a single reflection mirror, which has a simple structure and is easy to implement.

In a possible implementation, an infrared filter is also included, and the infrared filter is used to transmit the incident light beam and filter out ambient light other than infrared light. Infrared filters can transmit infrared light, filter out ambient light in other light bands except infrared light, and improve imaging quality.

The second aspect of the application provides an identification device, which includes a light-emitting module, a reflective module and a camera module. The reflective module includes a reflective surface. The light-emitting module is used to emit infrared light. The infrared light is scattered by the object to be measured to form an incident beam. The reflective surface It is used to reflect the incident beam to form an imaging beam, and the camera module is used to receive the imaging beam to form an infrared image of the object to be measured.

Among them, the reflective surface is a convex surface. According to the imaging rules, the light beam is reflected by the convex surface to form a reduced image. That is to say, when reflecting the same size image, the size of the reflective surface required by the reflective module is relatively small, which can reduce the reflection. The thickness of the module thereby reduces the thickness of the entire identification device, thereby achieving the purpose of miniaturization and thinning of the identification device.

In a possible implementation, the convex surface at least includes a sphere, a quadratic surface or a free-form surface.

When the convex surface is a spherical surface, the radius of curvature of the convex surface is 10mm-200mm. On the condition that the thickness of the recognition device is reduced, the distortion can be reduced and the compensation for the distortion can be easily realized, which is conducive to ensuring the imaging quality.

In a possible implementation, the reflection module at least includes a reflection mirror.

In a possible implementation, an infrared filter is also included, and the infrared filter is used to transmit the incident light beam and filter out ambient light other than infrared light.

The third aspect of the present application provides an identification device, which includes a light-emitting module, a reflective module and a camera module. The reflective module includes a light-incident surface, a reflective surface and a light-emitting surface.

The light-emitting module is used to emit infrared light. The infrared light is scattered by the object to be measured to form an incident beam. The incident surface is used to transmit the incident beam to the reflective surface. The reflective surface is used to reflect the incident beam to the light-emitting surface. The light-emitting surface is used to transmit the incident light to the light-emitting surface. The light beam passes through to form an imaging beam, and the camera module is used to receive the imaging light beam to form an infrared image of the object to be measured.

At least one of the light incident surface, the reflective surface and the light emergent surface is a curved surface. When the reflective surface is a curved surface, the curved surface is a convex surface that bulges toward the inside of the reflection module. When at least one of the light incident surface and the light emergent surface is a curved surface, the curved surface is a convex surface that faces the inside of the reflective module. The raised convex surface on the outside of the reflective module.

The incident beam enters the reflective module through the light incident surface and is irradiated to the reflective surface. The reflective surface converts the incident beam into It is reflected to the light-emitting surface, and the light-emitting surface allows the incident light beam to pass through to form an imaging light beam that is output from the reflective module. The light beam can form a reduced image when passing through the convex surface or being reflected by the convex surface, so that the light-incoming surface and the light-emitting surface are convex surfaces convex toward the outside of the reflective module, and the reflective surface is a convex surface convex toward the inside of the reflective module, which can reduce the thickness of the reflective module. , thereby reducing the thickness of the entire identification device.

In a possible implementation manner, the light-incident surface and the light-emitting surface are both flat surfaces, and the reflective surface is a convex surface. The incident light beam shines through the light incident surface onto the convex reflecting surface, and the light beam is reflected by the convex surface to form a reduced image. The reflective surface reflects the incident light beam to the light exit surface. When reflecting an image of the same size, the size of the required reflective surface is relatively small, and the size of the required light-emitting surface can also be reduced, thereby reducing the thickness of the reflective module, thereby reducing the thickness of the entire identification device.

In a possible implementation, the reflective surface and the light-emitting surface are both flat surfaces, and the light-incident surface is a convex surface. The incident light beam passes through the convex light incident surface and shines on the reflective surface. The light beam passes through the convex surface to form a reduced image. Therefore, the size of the required reflective surface and light exit surface is smaller, and the size of the reflective module can also be reduced. thickness.

In a possible implementation manner, the reflective surface is a flat surface, and both the light-incident surface and the light-emitting surface are convex surfaces. The incident light beam passes through the convex light incident surface to achieve a reduction in imaging and reduce the thickness of the required reflective surface and light exit surface. The reflective surface reflects the incident light beam to the light-emitting surface, and the incident light beam passes through the outwardly convex light-emitting surface to form an imaging beam, and is irradiated to the camera module to form an infrared image of the finger vein. The light-emitting surface can achieve a secondary reduction in imaging, further reduce the required thickness dimensions of the reflective surface and the light-emitting surface, and further reduce the thickness of the reflective module.

In a possible implementation, the reflection module is a triangular prism. It has higher setting stability, is conducive to improving the reliability of the identification device, and is easy to assemble and implement.

In a possible implementation, two ends of the light incident surface intersect with the first end of the light exit surface and the first end of the reflective surface respectively.

The reflective module has a flat-angle structure on one end opposite to the light-incident surface to remove part of the reflective surface and the light-emitting surface. The two ends of the flat-angle structure intersect with the second end of the light-emitting surface and the second end of the reflective surface respectively. By forming a flat-angle structure on the reflective module, the size of the reflective surface and the light-emitting surface can be reduced while ensuring imaging performance, thereby reducing the thickness of the reflective module. It is easy to operate and implement, and has good flexibility. The volume to be removed can be selected according to the actual needs of the imaging field of view, which is conducive to further reducing the thickness of the identification device.

A fourth aspect of the present application provides an electronic device, including a housing and any one of the above identification devices, and the identification device is disposed in the housing.

By including an identification device, the identification device has a smaller thickness while ensuring imaging performance, which is conducive to meeting the miniaturization and thinning design requirements of electronic equipment.

In a possible implementation, the infrared image includes a preset infrared image or an infrared image to be identified.

It also includes a processing module, which is connected to the camera module. The processing module is used to obtain the preset infrared image and the infrared image to be identified respectively. The processing module is also used to compare the preset infrared image and the infrared image to be identified, and obtain the comparison result. .

Description of drawings

Figure 1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of another electronic device provided by an embodiment of the present application;

Figure 3 is a schematic structural diagram of an identification device in the related art;

Figure 4 is a schematic structural diagram of an identification device provided by an embodiment of the present application;

Figure 5 is a simulation diagram of an identification device provided by an embodiment of the present application;

Figure 6 is a simulation diagram of a recognition device in a comparison group provided by an embodiment of the present application;

Figure 7 is a schematic structural diagram of another identification device provided by an embodiment of the present application;

Figure 8 is a schematic structural diagram of a reflection module in another identification device provided by an embodiment of the present application;

Figure 9 is a simulation diagram of another identification device provided by an embodiment of the present application;

Figure 10 is a schematic structural diagram of another identification device provided by an embodiment of the present application;

Figure 11 is a schematic structural diagram of yet another identification device provided by an embodiment of the present application;

Figure 12 is a schematic structural diagram of another identification device provided by an embodiment of the present application;

Figure 13 is a schematic structural diagram of yet another identification device provided by an embodiment of the present application;

Figure 14 is a schematic structural diagram of another identification device provided by an embodiment of the present application;

Figure 15 is a schematic structural diagram of yet another identification device provided by an embodiment of the present application.

Explanation of reference symbols:
100-Identification device;
10-Light-emitting module;
20-reflective module; 21-reflective surface; 22-light incident surface; 23-light emitting surface;
30-camera module;
40-Infrared filter;
200-finger.

Detailed ways

The terms used in the embodiments of the present application are only used to explain specific embodiments of the present application and are not intended to limit the present application.

An electronic device provided by the embodiment of the present application may include door locks, safes, attendance machines, mice, car handles and other devices, and may also include convenient mobile terminals such as mobile phones, tablet computers, notebook computers, smart watches, and personal digital assistants. equipment.

In the embodiment of the present application, the electronic device and the identification device are explained by taking the electronic device as a door lock as an example.

The electronic device may include a housing and an identification device, and the identification device may be disposed in the housing. The identification device can be used to obtain an image of the object to be tested to identify the characteristics of the object to be measured. Specifically, the feature can be a biological characteristic, for example, a fingerprint of a finger. The identification device can be used to obtain an image of the finger fingerprint to identify the fingerprint. identification. Alternatively, it can also be a finger vein, and the identification device can be used to obtain a finger vein image to identify the finger vein. Alternatively, the feature can also be other designated features, for example, it can be blood oxygen. The identification device can be used to obtain a distribution image of blood oxygen in a living body to realize the identification and detection of blood oxygen concentration. In the embodiment of the present application, the implementation of authentication and identification of electronic equipment is explained by taking the identification device to obtain a finger vein image and thereby realizing the identification of finger veins as an example.

FIG. 1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.

The electronic device may also include a processing module 400. The processing module 400 may be a processor and may have functions such as computing, storing, and processing data. Among them, as shown in Figure 1, the processing module 400 can be integrated in the identification device 100, That is, the recognition device 100 includes the processing module 400. Specifically, the processing module 400 can be connected to the camera module 30 of the recognition device 100. The camera module 30 can form an infrared image of the finger vein and transmit it to the processing module 400.

It should be noted that, in order to achieve identity authentication and recognition, the infrared image of the user's finger veins can be obtained for the first time through the identification device 100. This image is a preset infrared image, and the camera module 30 can transmit the formed preset infrared image to the processing module. 400. The processing module 400 can store and process the preset infrared image.

When the user performs identity recognition, the camera module 30 of the identification device 100 can obtain the infrared image of the finger vein again, and use this image as the infrared image to be identified. The camera module 30 can transmit the obtained infrared image to be identified to the processing module 400 for processing. The module 400 can compare the infrared image to be identified and the preset infrared image, and obtain a comparison result. For example, the comparison result can be that the infrared image to be identified and the preset infrared image are the same, or that the infrared image to be identified is the same as the preset infrared image. Infrared images are different. The electronic device can identify the user's identity based on the comparison results.

For example, the electronic device may also include a main control module 500 and a lock structure 300. The main control module 500 is used to implement overall control of the electronic device, and the lock structure 300 is used to implement locking and unlocking of the electronic device. The processing module 400 can be connected to the main control module 500. The processing module 400 can transmit the obtained comparison results to the main control module 500. The main control module 500 can be connected to the lock structure 300. The main control module 500 can implement comparison according to the comparison results. Recognize the user's identity and control the opening or closing of the lock structure 300. For example, when the comparison result is that the infrared image to be identified is the same as the preset infrared image, the main control module 500 controls the lock structure 300 to open to unlock the electronic device. When the comparison result is that the infrared image to be identified is different from the preset infrared image, the main control module 500 controls the lock structure 300 to close to achieve locking of the electronic device.

FIG. 2 is a schematic structural diagram of another electronic device provided by an embodiment of the present application.

Alternatively, the processing module 400 and the identification device 100 can be independently installed in the electronic device, and the processing module 400 can serve as the main control module of the electronic device to implement overall control of the electronic device. The processing module 400 can be connected to the camera module of the identification device 100. The camera module can form a finger vein image and transmit it to the processing module 400. The function of the processing module 400 can be the same as the above-mentioned processing module. The processing module 400 can obtain the preset infrared image of the finger vein. image and the infrared image to be identified, and compare the two to obtain the comparison result.

As shown in Figure 2, the processing module 400 can be connected to the identification device 100 and the lock structure 300 respectively. After the processing module 400 obtains the comparison result, it can realize the identification of the user's identity based on the comparison result. The processing module 400 can also identify the lock structure 300. The control is realized by opening or closing. For example, when the comparison result is that the infrared image to be identified is the same as the preset infrared image, the processing module 400 controls the lock structure 300 to open. When the comparison result is that the infrared image to be identified is different from the preset infrared image. , then the processing module 400 controls the lock structure 300 to close.

It should be noted that the processing module 400 can be used as a main control module of an electronic device. In addition to controlling the lock structure 300, the processing module 400 can also be connected to other structures of the electronic device to control other functions. , for example, can be connected to the display screen of electronic equipment.

Figure 3 is a schematic structural diagram of an identification device in the related art.

Specifically, as shown in Figure 3, the identification device 1 usually includes an infrared light source 101, an infrared filter 103 and a camera 102. The infrared filter 103 is arranged parallel to the horizontal plane, and the infrared light source 101, the infrared filter 103 and the camera 102 They can be arranged sequentially in the thickness direction (the direction perpendicular to the horizontal plane). The finger 200 can be inserted into the optical path of the infrared light source 101 and the camera 102. Specifically, the finger 200 can be inserted between the infrared light source 101 and the infrared filter 103.

The infrared light source 101 emits infrared light. The infrared light will be scattered when it shines on the finger 200. Part of the infrared light will shine through the finger 200 to the camera 102. The camera 102 receives the infrared light passing through the finger 200 and can form an infrared image of the finger. Among them, veins absorb infrared light better than other tissues of fingers (such as muscles, dermis, etc.), and infrared light passes through Dark stripes will appear when passing through the veins, thus forming an image of a vein network on the infrared image, thus obtaining an infrared image of the finger veins.

Vein recognition utilizes the uniqueness of human finger vein network characteristics and the strong infrared absorption characteristics of hemoglobin in finger veins to achieve identity authentication. It has the characteristics of in vivo detection and in vivo detection, and is not easy to be copied and misappropriated, and has received extensive research and attention. As vein recognition technology is applied in more and more scenarios, the requirements for the volume and thickness of vein recognition devices are becoming higher and higher, and recognition devices are gradually developing in the direction of miniaturization and thinning.

In the above-mentioned vein identification device, according to the imaging principle, a certain object distance is required for clear imaging, that is, a certain distance requirement needs to be met between the finger 200 and the camera 102, and the thickness (length in the thickness direction) of the identification device 1 will Restricted by the object distance, the thickness of the identification device 1 is relatively large, and the entire identification device 1 is large in size, which cannot meet the design requirements for miniaturization and thinning of the identification device 1 .

Based on this, embodiments of the present application provide an identification device. The identification device has a small thickness and volume, which is conducive to the miniaturization and thinning of the identification device. It can be applied to general scenarios such as door locks, attendance, identification and authentication in specific places, and can also be used in finance and other applications that require high confidentiality levels. Scenario identification and authentication, etc., or it can also be applied to any other scenario that requires identification.

Figure 4 is a schematic structural diagram of an identification device provided by an embodiment of the present application.

The direction parallel to the horizontal plane is the horizontal direction, such as the x direction in the figure, and the direction perpendicular to the horizontal plane is the thickness direction, such as the y direction in the figure.

As shown in FIG. 4 , the identification device 100 may include a light-emitting module 10 , a reflective module 20 and a camera module 30 . The reflective module 20 may be located on the optical path between the light-emitting module 10 and the camera module 30 .

The light-emitting module 10 can emit infrared light. For example, the light-emitting module 10 can emit narrow-wave infrared light. The infrared light emitted by the light-emitting module 10 can illuminate the finger 200 and be scattered on the finger 200. Part of the infrared light can pass through the finger 200, and part of the infrared light can be reflected by the finger 200.

Taking the infrared light that can illuminate the reflective module 20 after being scattered by the finger 200 as the incident beam, for example, as shown in FIG. 4 , the light-emitting module 10 and the reflective module 20 can be arranged in sequence along the thickness direction, and the camera module 30 can be located on the reflective module. 20 is on one side in the horizontal direction. When using the identification device, the finger 200 can be located between the light-emitting module 10 and the reflective module 20. The infrared light passing through the finger 200 is an incident beam and can be irradiated onto the reflective module 20.

The reflective module 20 can reflect and refract the infrared light irradiated thereon, and change the optical path direction of the infrared light. The infrared light emitted by the light-emitting module 10 passes through the finger 200 to form an incident beam. The incident beam is illuminated on the reflective module 20. The reflective module 20 reflects the incident beam and forms an imaging beam. The imaging beam is illuminated on the camera module 30, and the camera module 30 receives the imaging beam. , an infrared image of the finger 200 can be formed, thereby obtaining an infrared image of the finger veins for identity authentication and recognition.

The reflection module 20 realizes the refraction of the optical path between the finger 200 and the camera module 30 , thereby reducing the length of the object distance in the thickness direction, thereby reducing the thickness of the identification device 100 .

It should be noted that the light-emitting module 10 and the reflective module 20 may be located on the same side of the finger 200. For example, the electronic device may also include a light-transmissive touch panel (not shown in the figure), and the touch panel is disposed on the housing. On the device, the touchpad can be set parallel to the horizontal plane, and fingers can be placed on the touchpad during use. The infrared light emitted by the light-emitting module 10 can be illuminated on the finger 200 through the touch panel, and the incident light beam formed by scattering by the finger 200 can also be illuminated on the reflective module 20 through the touch panel.

With the side of the touch panel facing the inside of the housing as the bottom of the touch panel, the light emitting module 10, the reflective module 20 and the camera module 30 can all be located below the touch panel. When using the recognition device, the finger 200 is located on the touch panel. Above, the infrared light emitted by the light-emitting module 10 is scattered by the finger, and the part reflected by the finger forms an incident beam. The incident beam is reflected by the reflection module 20 to form an imaging beam. The camera module 30 receives the imaging beam and obtains an infrared image of the finger vein.

Alternatively, the light-emitting module 10 and the reflective module 20 can be located on opposite sides of the finger, the light-emitting module 10 can be located above the touch pad, and the reflective module 20 and the camera module 30 can be located below the touch pad, such as shown in Figure 3. The light-emitting module 10 and the reflective module 20 are arranged along the thickness direction. When using the identification device, the finger 200 is located between the light-emitting module 10 and the reflective module 20 . The infrared light passing through the finger 200 forms an incident beam. The incident beam is reflected by the reflective module 20 and forms an imaging beam. The camera module 30 receives the imaging beam and obtains an infrared image of the finger vein.

Of course, in some other examples, the light-emitting module 10 may also be located on one side of the touch panel in the horizontal direction. In the embodiment of the present application, the light-emitting module 10 and the reflective module 20 are arranged along the thickness direction, and the finger is located between the light-emitting module 10 and the reflective module 20 as an example.

As shown in FIG. 4 , the identification device 100 may also include an infrared filter 40 , which is located between the finger 200 and the reflective module 20 . For example, when the identification device 100 is installed on an electronic device, the infrared filter 40 40 can be located under the touch panel. The infrared filter 40 can transmit infrared light and filter out ambient light in other light bands except infrared light in the environment. The incident light beam passes through the infrared filter 40 and then illuminates the reflection module. 20. Helps improve imaging quality.

The light-emitting module 10 may be an infrared lamp, for example, an infrared LED light. Of course, in some other examples, the light-emitting module 10 may also be any other device capable of emitting infrared light.

The camera module 30 may be a camera. Of course, in some other examples, the camera module 30 may also be any other module or device capable of realizing the camera function.

The identification device 100 may also include a support structure member (not shown in the figure), and the light-emitting module 10, the reflection module 20, the camera module 30, the infrared filter 40, etc. may be disposed on the support structure member to achieve identification. The integration of various structural components in the identification device 100 improves the reliability of the identification device 100 and facilitates assembly.

The structure of the identification device provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

Embodiment 1

Referring to FIG. 4 , in this embodiment, the reflective module 20 has a reflective surface 21 . The infrared light emitted by the light-emitting module 10 passes through the finger 200 and forms an incident beam. The incident beam irradiates onto the reflective surface 21 and is reflected by the reflective surface 21 . An imaging beam is formed, and the imaging beam is irradiated to the camera module 30. The camera module 30 receives the imaging beam and forms an infrared image of the finger vein.

The reflective surface 21 may be a flat surface, and the reflective surface 21 may be arranged inclined to a horizontal plane. Specifically, taking the inclination angle formed between the reflective surface 21 and the horizontal plane as the first included angle, such as the first included angle α shown in FIG. 4 , the value of the first included angle α can be made less than 45°.

It should be understood that, under the condition that the above-mentioned optical path structure is satisfied to ensure imaging performance, the smaller the value of the first included angle α, the smaller the distance from the end of the reflective module 20 away from the finger 200 to the finger 200 (or the light-emitting module 10 ). Therefore, making the value of the first included angle α less than 45° can further reduce the size of the entire identification device 100 in the thickness direction, thereby achieving miniaturization and thinning of the identification device 100 .

Specifically, the value of the first included angle α can satisfy: α=45°-b, that is, the difference between the first included angle and 45° is b. That , 0°<b≤10°, that is to say, the value range of the first included angle α is: 35≤α<45°. This helps to ensure the imaging performance of the identification device 100 while reducing the thickness of the identification device 100, meet imaging quality requirements, and improve the accuracy of the identification device 100.

Among them, when 0°<b≤5°, that is, when the value range of the first angle α is: 40≤α<45°, the identification device 100 can have a smaller thickness and better imaging performance. At the same time, it meets the needs of high imaging quality and miniaturization and thinning design.

It should be understood that when the first included angle is 45°, the reflective surface 21 of the reflective module 20 can achieve vertical refraction of the optical path, and the incident light beam irradiated on the reflective surface is in phase with the imaging light beam reflected by the reflective surface 21. Vertically, at this time, the optical axis of the camera module 30 can be parallel to the horizontal plane. The optical axis of the camera module 30 may refer to the optical axis of the lens in the camera module, that is, a straight line passing through the center of the lens and perpendicular to the mirror surface of the lens.

When the first included angle is less than 45°, specifically, the difference from 45° is a, the optical axis (see optical axis L in FIG. 4 ) of the camera module 30 can be set at an angle to the horizontal plane, so that the optical axis is aligned with the horizontal plane. The inclination angle between them is the second included angle, such as the second included angle β in Figure 4. Then the second included angle β can be satisfied: β=2b. It is beneficial to meet the paraxial conditions of imaging of the camera module 30, thereby improving the quality of imaging and improving the accuracy of the identification device 100.

The reflective module 20 may be a single reflective mirror. Of course, in some other examples, the reflective module 20 may also be other structural components having a reflective surface 21 capable of reflecting light beams.

FIG. 5 is a simulation schematic diagram of an identification device provided by an embodiment of the present application, and FIG. 6 is a simulation schematic diagram of an identification device in a comparison group provided by an embodiment of the present application.

Among them, it should be noted that the structure and composition of the recognition device of the comparison group in Figure 6 are the same as the structure and composition of the recognition device in this embodiment, and the field of view is also the same. The difference is that in the comparison group, the first included angle between the reflective surface 21 and the horizontal plane is 45°. In the identification device shown in the embodiment of the present application, the first included angle between the reflective surface 21 and the horizontal plane is 41°.

As shown in FIG. 5 and FIG. 6 , when the same light-emitting module, camera module, etc. architecture is used and the same field of view is achieved, when the first included angle between the reflective surface 21 and the horizontal plane is 41°, The identification device has a smaller thickness. Specifically, compared with the first included angle of 45°, the thickness of the identification device is reduced by 14.3%.

Embodiment 2

FIG. 7 is a schematic structural diagram of another identification device provided by an embodiment of the present application. FIG. 8 is a schematic structural diagram of a reflection module in another identification device provided by an embodiment of the present application.

As shown in Figure 7, what is different from Embodiment 1 is that in this embodiment of the present application, the reflective surface 21 of the reflective module 20 is a convex surface. For example, as shown in Figure 8, the reflective module 20 has a convex reflective surface 21. Reflector.

Continuing to refer to FIG. 7 , the infrared light emitted by the light-emitting module 10 passes through the finger 200 to form an incident beam. The incident beam irradiates the convex reflective surface 21 and is reflected by the reflective surface 21 to form an imaging beam. The imaging beam is irradiated to the camera module. 30. The camera module 30 receives the imaging beam and forms an infrared image of the finger vein.

According to the imaging law, the light beam is reflected by a convex surface to form a reduced image, so that the reflective surface 21 is a convex surface. When reflecting an image of the same size, the size of the reflective surface 21 required by the reflective module 20 is relatively small, which can reduce the reflective module 20 thickness (dimension in the thickness direction), thereby reducing the thickness of the entire identification device 100, which is beneficial to miniaturization and thinning of the identification device 100.

It should be noted that the connecting straight line between the two ends of the reflective surface 21 can be arranged obliquely to the horizontal plane. For example, as shown in FIG. 7 , the connecting straight line between the two ends of the reflective surface 21 and the horizontal piece Forming the tilt angle γ, tilt The angle γ can be equal to 45°, and of course the tilt angle γ can also be less than 45°.

It should be understood that when the reflective surface 21 of the reflective module 20 is a convex surface, the incident light beam is reflected by the convex reflective surface 21 to form an imaging light beam, and the camera module 30 receives the imaging light beam and forms an infrared image of the finger vein. The introduction of the convex surface will have a certain distortion effect on the imaging of the camera module 30 . The degree of distortion can be adjusted by adjusting the curvature of the reflective surface 21 to reduce or avoid the impact on imaging quality and ensure the accuracy of the identification device 100 .

Of course, in some other examples, the above distortion can also be compensated and adjusted in other ways. For example, the image algorithm of the camera module 30 can be adjusted to compensate for the impact of distortion on imaging, reducing or avoiding the impact on imaging quality.

The shape of the reflective surface 21 of the reflective module 20 may be a regular or irregular convex surface such as a sphere, a quadratic surface, or a free-form surface.

Specifically, when the reflective surface 21 is a spherical surface, the thickness of the identification device 100 can be reduced, the distortion can be reduced, and the compensation for the distortion can be easily realized, which is beneficial to ensuring the imaging quality.

The radius of curvature of the spherical surface can be 10 mm to 200 mm, so that the identification device 100 has a smaller thickness and better imaging quality.

Figure 9 is a simulation diagram of another identification device provided by an embodiment of the present application.

A simulation comparison was conducted between the recognition device and the comparison group in the embodiment of the present application. The comparison group can be found in Embodiment 1. Its structure is the same as that of the recognition device in the embodiment of the present application, and the size of the field of view is also the same. The difference is that in the comparison group, the reflective surface 21 is a flat surface (see Figure 6). In the identification device shown in the embodiment of the present application, the reflective surface 21 is a spherical surface, and its radius of curvature is 100 mm.

As shown in FIG. 9 and FIG. 6 , when the same light-emitting module, camera module, etc. architecture is used and the same field of view is achieved, when the reflective surface 21 is a convex surface, the identification device 100 has a smaller thickness. Specifically, compared with when the reflective surface 21 is flat, the thickness of the identification device 100 is reduced by 10.6%.

Embodiment 3

Figure 10 is a schematic structural diagram of another identification device provided by an embodiment of the present application.

Referring to FIG. 10 , in the embodiment of the present application, the reflective module 20 includes a light incident surface 22 , a reflective surface 21 and a light exit surface 23 , where both the light incident surface 22 and the light exit surface 23 can transmit infrared light. For example, the reflective module 20 may be a prism with at least three sides. Specifically, the reflection module 20 may be a triangular prism, the three surfaces of which form a light incident surface 22, a reflective surface 21 and a light exit surface 23 respectively.

Of course, in some other examples, the reflection module 20 can also be prisms of other shapes, such as trapezoids, polygonal prisms, etc., or the reflection module 20 can also be prisms of other irregular shapes. When the reflective module 20 is a prism, it has higher installation stability, which is beneficial to improving the reliability of the identification device 100 and is easy to assemble and implement.

Continuing to refer to FIG. 10 , the infrared light emitted by the light-emitting module 10 passes through the finger 200 to form an incident beam. The incident beam enters the reflective module 20 through the light incident surface 22 and is transmitted to the reflective surface 21 . The reflective surface 21 illuminates the incident beam. The light beam is reflected to the light-emitting surface 23. The light-emitting surface 23 transmits the incident light beam to form an imaging light beam and outputs it from the reflection module 20. The imaging light beam is irradiated to the camera module 30. The camera module 30 receives the imaging light beam and forms an infrared image of the finger vein.

Among them, at least one of the light incident surface 22, the reflective surface 21, and the light exit surface 23 can be a curved surface. Specifically, when the light incident surface 22 is a curved surface, the light incident surface 22 can be formed by protruding toward the outside of the reflective module 20. convex surface. When the reflective surface 21 is a convex surface, the reflective surface 21 may be a convex surface formed toward the interior of the reflective module 20 . When the light-emitting surface 23 is a convex surface, the light-emitting surface 23 The light surface 23 may be a convex surface formed by protruding toward the outside of the reflective module 20 .

For example, take a triangular prism as an example. Among the three faces of a triangular prism, two adjacent faces can be convex outwards. Anti-reflection coatings can be coated on these two convex faces to respectively form the incident light. Surface 22 and light exit surface 23. The other surface can be convex inward, and a reflective film or the like can be coated on the inward convex surface to form the reflective surface 21 .

The incident beam enters the reflective module 20 through the light incident surface 22 and is transmitted to the reflective surface 21. The reflective surface 21 reflects the incident beam to the light exit surface 23. The light exit surface 23 allows the incident beam to pass through to form an imaging beam from the reflection module 20. output. According to the imaging rules, the light beam can form a reduced image when passing through a convex surface or being reflected by a convex surface. Therefore, making at least one of the light incident surface 22, the reflective surface 21, and the light exit surface 23 the above-mentioned convex surface can reduce the thickness of the reflective module 20. Thus, the thickness of the entire identification device 100 is reduced.

It should be noted that one of the light-incident surface 22, the reflective surface 21, and the light-emitting surface 23 can be a curved surface, and the others can be flat surfaces. Alternatively, two of the above three can be curved surfaces and the rest can be flat surfaces. Alternatively, all the above three can be curved surfaces.

Specifically, in a possible implementation, as shown in FIG. 10 , the light incident surface 22 of the reflective module 20 can be a plane, the light exit surface 23 of the reflective module 20 can also be a plane, and only the reflective surface 21 is facing the reflection. The raised convex surface in the module 20.

The infrared light emitted by the light-emitting module 10 passes through the finger 200 to form an incident beam. The incident beam enters the reflective module 20 through the light incident surface 22 and is illuminated on the convex reflective surface 21. The beam is reflected by the convex surface to form a reduced image. The reflective surface 21 reflects the incident light beam to the light-emitting surface 23. The incident light beam passes through the light-emitting surface 23 to form an imaging beam and is irradiated to the camera module 30. The camera module 30 receives the imaging beam and forms an infrared image of the finger vein. When reflecting images of the same size, the required size of the reflective surface 21 is relatively small, and the required size of the light-emitting surface 23 can also be reduced, thereby reducing the thickness of the reflective module 20 and thus reducing the size of the entire identification device. 100 thickness.

Since the reflective surface 21 is convex, the required sizes of the reflective surface 21 and the light-emitting surface 23 are smaller. The reflective module 20 with the small-sized reflective surface 21 and the light-emitting surface 23 can be formed through size control when the reflective module 20 is formed. Alternatively, the sizes of the reflective surface 21 and the light-emitting surface 23 can also be cut and adjusted after molding.

Figure 11 is a schematic structural diagram of yet another identification device provided by an embodiment of the present application.

For example, as shown in FIG. 11 , a flat-angle structure may be formed on the end of the reflective module 20 opposite to the light incident surface 22 . The two ends of the light incident surface 22 are respectively connected to the first end of the light exit surface 23 and the first end of the reflective surface 21 . The two ends of the flat-angle structure intersect with the second end of the light-emitting surface 23 and the second end of the reflective surface 21 respectively, forming a trapezoidal structure as shown in FIG. 11 .

For example, on the basis of the prism in FIG. 10 , part of the reflective surface 21 and the light-emitting surface 23 can be removed by cutting, thereby forming a flat-angle structure on the reflective module 20 . Under the condition of ensuring imaging performance, the size of the reflective surface 21 and the light-emitting surface 23 is reduced to reduce the thickness of the reflective module 20, thereby reducing the thickness of the identification device 100. It is easy to operate and implement, and has good flexibility. The volume to be removed can be selected according to the actual demand of the imaging field of view, which is beneficial to further reducing the thickness of the identification device 100.

It should be understood that when the reflective module 20 is formed, the reflective module 20 can also have a trapezoidal structure as shown in Figure 11. The end of the reflective module 20 opposite to the light incident surface 22 has a flat-angle structure, and the reflective surface 21 and The light-emitting surfaces 23 all have smaller sizes.

Figure 12 is a schematic structural diagram of another identification device provided by an embodiment of the present application.

Or, in another possible implementation, as shown in FIG. 12 , the reflective surface 21 of the reflective module 20 can The light-emitting surface 23 of the reflective module 20 may also be a flat surface, and only the light-incident surface 22 may be a convex surface protruding toward the outside of the reflective module 20 .

The infrared light emitted by the light-emitting module 10 passes through the finger 200 to form an incident light beam. The incident light beam passes through the convex light incident surface 22 and irradiates onto the reflective surface 21. The light beam passes through the convex surface to form a reduced image. The reflective surface 21 reflects the incident light beam to the light-emitting surface 23. The incident light beam passes through the light-emitting surface to form an imaging beam and is irradiated to the camera module 30. The camera module 30 receives the imaging beam and forms an infrared image of the finger vein. The light beam forms a reduced image after passing through the light incident surface 21, so the required sizes of the reflective surface 21 and the light exit surface 23 will be smaller, and the thickness of the reflective module 20 can also be reduced, thereby reducing the thickness of the entire identification device 100.

Figure 13 is a schematic structural diagram of yet another identification device provided by an embodiment of the present application.

As shown in Figure 13, a flat-angle structure can also be formed on the end of the reflective module 20 opposite to the light incident surface 22, thereby removing part of the reflective surface 21 and the light exit surface 23, and further reducing the size of the identification device while ensuring imaging performance. 100 thickness.

Figure 14 is a schematic structural diagram of another identification device provided by an embodiment of the present application.

Or, in another possible implementation, as shown in FIG. 14 , the reflective surface 21 of the reflective module 20 can be a flat surface, the light-incident surface 22 can be a convex surface protruding toward the outside of the reflective module 20 , and the light-emitting surface 23 can also be A convex surface protruding toward the outside of the reflective module 20 .

The infrared light emitted by the light-emitting module 10 passes through the finger 200 to form an incident beam, and the incident beam passes through the convex light incident surface 22 to achieve a reduction in imaging and reduce the required thickness of the reflective surface 21 and the light exit surface 23 . The reflective surface 21 reflects the incident beam to the light-emitting surface 23. The incident beam passes through the outwardly convex light-emitting surface 23 to form an imaging beam, and is irradiated to the camera module 30. The camera module 30 receives the imaging beam and forms an infrared image of the finger vein. The light-emitting surface 23 can achieve a secondary reduction in imaging, further reduce the required thickness dimensions of the reflective surface 21 and the light-emitting surface 23 , further reduce the thickness of the reflective module 20 , and reduce the thickness of the identification device 100 .

Among them, it should be noted that, as shown in FIG. 14 , the incident light beam passes through the two convex surfaces of the light incident surface 22 and the light exit surface 23 to achieve a secondary reduction in imaging, which will lengthen the focal length of the reflection module 20 and make the camera module 30 and the reflection module 20 longer. The object distance of module 20 in the horizontal direction is relatively increased.

Referring to FIG. 15 , a flat-angle structure can also be formed on the end of the reflective module 20 opposite to the light incident surface 22 , and part of the reflective surface 21 and the light exit surface 23 can be removed to further reduce the size of the identification device 100 while ensuring imaging performance. thickness of.

In the description of the embodiments of this application, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a fixed connection. Indirect connection through an intermediary can be an internal connection between two elements or an interactive relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

The terms "first", "second", "third", "fourth", etc. (if present) in the description and claims of the embodiments of this application and the above-mentioned drawings are used to distinguish similar objects, and It is not necessary to describe a specific order or sequence.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, but not to limit them; although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art It should be understood that the technical solutions recorded in the foregoing embodiments can still be modified, or the technical solutions described in the foregoing embodiments can still be modified. Some or all of the technical features are equivalently substituted; and these modifications or substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of each embodiment of the present application.

Claims

An identification device, characterized in that it includes: a light-emitting module, a reflection module and a camera module. The reflection module includes a reflective surface. The light-emitting module is used to emit infrared light. The infrared light is scattered by the object to be measured to form an incident beam. , the reflective surface is used to reflect the incident beam to form an imaging beam, and the camera module is used to receive the imaging beam to form an infrared image of the object to be measured;

The reflective surface is a plane, the reflective surface is inclined to the horizontal plane, the reflective surface forms a first included angle with the horizontal plane, and the first included angle is less than 45°.
The identification device according to claim 1, characterized in that the first included angle α satisfies: α=45°-b, where 0°<b≤10°.
The identification device according to claim 2, characterized in that 0°<b≤5°.
The identification device according to claim 2 or 3, characterized in that the optical axis of the camera module is tilted to the horizontal plane, and the optical axis and the horizontal plane form a second included angle, and the second included angle β satisfies: β=2b.
The identification device according to any one of claims 1 to 4, characterized in that the reflection module at least includes a reflection mirror.
The identification device according to any one of claims 1 to 5, further comprising an infrared filter for transmitting the incident light beam and filtering out the environment other than the infrared light. Light.
An identification device, characterized in that it includes a light-emitting module, a reflective module and a camera module, the reflective module includes a reflective surface, the light-emitting module is used to emit infrared light, the infrared light is scattered by the object to be measured to form an incident beam, The reflective surface is used to reflect the incident light beam to form an imaging beam, and the camera module is used to receive the imaging light beam to form an infrared image of the object to be measured. The reflective surface is a convex surface.
The identification device according to claim 7, wherein the convex surface at least includes a spherical surface, a quadratic surface or a free-form surface;

When the convex surface is a spherical surface, the radius of curvature of the convex surface is 10 mm-200 mm.
An identification device, characterized in that it includes a light-emitting module, a reflective module and a camera module, and the reflective module includes a light-incident surface, a reflective surface and a light-emitting surface;

The light-emitting module is used to emit infrared light. The infrared light is scattered by the object to be measured to form an incident light beam. The light incident surface is used to transmit the incident light beam to the reflective surface. The reflective surface is used to transmit the incident light beam to the reflective surface. The incident beam is reflected to the light-emitting surface, the light-emitting surface is used to transmit the incident beam to form an imaging beam, and the camera module is used to receive the imaging beam to form an infrared image of the object to be measured;

At least one of the light incident surface, the reflective surface and the light exit surface is a curved surface. When the reflective surface is a curved surface, the curved surface is a convex surface that projects toward the inside of the reflective module. When the light incident surface is a curved surface, When at least one of the surface and the light-emitting surface is a curved surface, the curved surface is a convex surface protruding toward the outside of the reflective module.
The identification device according to claim 9, wherein the light-incident surface and the light-emitting surface are both flat surfaces, and the reflective surface is a convex surface.
The identification device according to claim 9, wherein the reflective surface and the light-emitting surface are both flat surfaces, and the light-incident surface is a convex surface.
The identification device according to claim 9, characterized in that the reflective surface is a plane, and the light incident surface Both the light-emitting surface and the light-emitting surface are convex surfaces.
The identification device according to any one of claims 9-12, characterized in that the reflection module is a triangular prism.
The identification device according to any one of claims 9-12, wherein the two ends of the light-incident surface intersect with the first end of the light-emitting surface and the first end of the reflective surface respectively;

A flat-angle structure is formed on the end of the reflective module opposite to the light-incident surface to remove part of the reflective surface and the light-emitting surface. The two ends of the flat-angle structure are respectively connected to the second end and the light-emitting surface. The second ends of the reflective surfaces intersect.
An electronic device, characterized in that it includes a casing and the identification device according to any one of claims 1 to 6; or, it includes a casing and the identification device according to claim 7 or 8; or it includes a casing. And the identification device according to any one of the above claims 9-14;

The identification device is arranged in the housing.
The electronic device according to claim 15, wherein the infrared image includes a preset infrared image or an infrared image to be recognized;

It also includes a processing module connected to the camera module. The processing module is used to obtain the preset infrared image and the infrared image to be identified respectively. The processing module is also used to compare the preset infrared image. Assume an infrared image and the infrared image to be identified, and obtain a comparison result.