Illumination system and palm scanning device

Abstract

An illumination system and a palm scanning device, the illumination system being applied to the palm scanning device, and the illumination system comprising an illumination lamp (1) and a DMD reflector (2). The DMD reflector (2) is located on an emergent light path of the illuminating lamp (1). The DMD reflector (2) comprises a plurality of pixel reflectors (21), and the angles of the plurality of pixel reflectors (21) are adjustable, so that the field of view of a reflected light ray of the DMD reflector (2) is adjustable.

Description

Lighting system and palm brushing equipment

[0001] This disclosure claims priority to Chinese patent application No. 202323090555.3, filed on November 15, 2023, and utility model name “Lighting system and palm brushing device,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0002] The present disclosure relates to the technical field of electronic equipment, and in particular to a lighting system and a palm-brushing device. Background Art

[0003] As convenient payment becomes increasingly pervasive in our daily lives, various biometric technologies are increasingly finding their way into the field of identity recognition. Palm print and vein capture and recognition technology is also gaining increasing attention, leading to the emergence of palm scanning devices.

[0004] In related technologies, the palm-swiping device includes a lighting system and a camera. The lighting system includes a lamp for illuminating the palm, and the camera photographs the user's palm, so that the palm-swiping device can recognize the user's palm features and then confirm the user's identity.

[0005] Summary of the Invention

[0006] In a first aspect, the present disclosure provides a lighting system, which is applied to a palm brush device, and includes a lighting lamp and a digital micromirror device (DMD) reflector;

[0007] The DMD reflector is located on the outgoing light path of the lighting lamp;

[0008] The DMD reflector includes a plurality of pixel reflectors, and the angles of the plurality of pixel reflectors are adjustable, so that the field angle of the reflected light of the DMD reflector is adjustable.

[0009] In a second aspect, the present disclosure further provides a palm-brushing device, comprising the lighting system as described in any one of the first aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a schematic structural diagram of a lighting system according to an embodiment of the present disclosure;

[0011] FIG2 is a schematic structural diagram of a DMD reflector according to an embodiment of the present disclosure;

[0012] FIG3 is a schematic structural diagram of a lighting system according to an embodiment of the present disclosure;

[0013] FIG4 is a schematic structural diagram of a lighting system according to an embodiment of the present disclosure;

[0014] FIG5 is a schematic structural diagram of a lighting system according to an embodiment of the present disclosure;

[0015] FIG6 is a schematic structural diagram of a lighting system according to an embodiment of the present disclosure.

[0016] Legend: 1. Lighting lamp; 2. DMD reflector, 21. Pixel reflector; 3. Distance sensor; 4. Controller; 5. Camera. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0018] The terms used in the embodiments of the present disclosure are intended only to explain the embodiments of the present disclosure and are not intended to limit the present disclosure. Unless otherwise defined, the technical or scientific terms used in the embodiments of the present disclosure should have the ordinary meaning understood by a person of ordinary skill in the art to which the present disclosure belongs. The use of "one" or "a" and similar terms in this disclosure specification and claims does not indicate a limit on quantity, but rather indicates the presence of at least one. "Include" or "comprises" and similar terms mean that the elements or objects appearing before "include" or "comprises" include the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up," "down," "left," "right," etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. "Multiple" means two or more, unless otherwise expressly defined.

[0019] As convenient payment becomes increasingly pervasive in our daily lives, various biometric technologies are increasingly finding their way into the field of identity recognition. Palm print and vein capture and recognition technology is also gaining increasing attention, leading to the emergence of palm scanning devices.

[0020] In related art, a palm-scanning device includes a lighting system and a camera. The lighting system includes a lamp for illuminating the palm. The camera captures the user's palm, enabling the palm-scanning device to recognize the user's palm features and confirm the user's identity.

[0021] When a user uses a palm-scanning device, the distance between their palm and the device is not fixed. If the palm is too close to the device, the light emitted by the illumination lamp may not cover the entire palm, making it difficult for the camera to clearly capture the palm's features. If the palm is far away from the device, the light intensity when it reaches the palm will be weakened, making it difficult for the camera to clearly capture the palm's features.

[0022] Therefore, to allow the camera to capture clear images for subsequent recognition, it is necessary to ensure that the lighting fully covers the palm at a relatively close position, that is, to achieve a large FOV (Field of View) illumination. It is also necessary to ensure that the lighting can effectively compensate for the brightness of the palm at a relatively far position, that is, to achieve a high illumination requirement.

[0023] However, when the FOV of the lighting lamp is large, although the coverage area of ​​the lighting lamp is large, the brightness of the light per unit area is dim. This makes the brightness of the palm surface dim when the palm is far away from the palm-swiping device, making it difficult for the camera to obtain clear palm features. In addition, when the palm is far away from the palm-swiping device, the proportion of the palm in the field of view angle area is significantly reduced, that is, only the light from the middle part of the lighting lamp shines on the palm, while the light from the edge of the lighting lamp does not shine on the palm, resulting in a large amount of light being wasted, making the lighting efficiency of the lighting system low.

[0024] In view of the above technical problems, the embodiments of the present disclosure provide a lighting system for use in a palm brush device. As shown in Figures 1 and 2, the lighting system includes a lighting lamp 1 and a DMD (Digital Micromirror Device) reflector 2. The DMD reflector 2 is located in the outgoing light path of the lighting lamp 1 and includes multiple pixel reflectors 21. The multiple pixel reflectors 21 have adjustable angles (or adjustable deflection angles) and are used to reflect light emitted by the lighting lamp 1 outward.

[0025] The DMD mirror 2 is a MEMS (Micro-Electro-Mechanical System) with electronic input and optical output. The DMD mirror 2 is composed of many small aluminum reflective mirrors (pixel mirrors 21), each of which is called a pixel. Each pixel mirror 21 can rotate to different angles under voltage control. The DMD mirror 2 uses MEMS manufacturing technology to integrate the pixel mirrors 21 and CMOS (Complementary Metal Oxide Semiconductor) SRAM (Static Random Access Memory) on the same chip.

[0026] In the technical solution provided by the embodiments of the present disclosure, since the DMD reflector 2 includes multiple pixel reflectors 21, and the angle of each pixel reflector 21 is adjustable, even if the field of view angle of the lighting lamp 1 is fixed, when the lighting lamp shines on the DMD reflector 2, the field of view angle of the light reflected by the DMD reflector 2 is also adjustable.

[0027] In this way, when the palm is close to the palm-brushing device, the deflection angle of the pixel reflector 21 is adjusted so that the field angle of the light reflected by the DMD reflector 2 is larger, so that the reflected light can cover the entire palm and the brightness of the light on the palm is uniform. When the palm is far away from the palm-brushing device, the deflection angle of the pixel reflector 21 is adjusted so that the field angle of the light reflected by the DMD reflector 2 is smaller, so that the light is concentrated in a smaller area, and the light intensity at the position of the palm is stronger. Among them, since the palm is far away from the palm-brushing device, the light can cover the entire palm even at a smaller field angle, so that the brightness of the light on the palm is uniform. In addition, by concentrating the light, the utilization rate of the light is improved, that is, the lighting efficiency of the lighting system is improved, which is conducive to reducing the power consumption of the palm-brushing device.

[0028] It can be seen that the field of view angle of the lighting system provided by the embodiment of the present disclosure is adjustable, so that the palm brushing device can obtain a clear palm image whether the palm is close to or far away from the palm brushing device.

[0029] Because the lighting system provided by the disclosed embodiments does not illuminate the palm directly with the illuminating lamp 1, but instead reflects the light reflected by the DMD reflector 2 toward the palm, compared to related technologies, the illuminating lamp 1 does not need to have a large field of view. In some examples, the field of view of the illuminating lamp 1 is 20°-60°, while the field of view of the light reflected by the DMD reflector 2 is 90°-120°. This allows the light emitted by the illuminating lamp 1 to have a higher edge brightness, resulting in a higher brightness after reflection from the DMD reflector 2, thereby illuminating the edge of the palm.

[0030] In some examples, as shown in FIG1 , the lighting system further includes a distance sensor 3 and a controller 4. The distance sensor 3 is used to detect the distance from the palm. The controller 4 is electrically connected to the DMD reflector 2 and the distance sensor 3. The controller 4 is used to adjust the angle of the pixel reflector 21 based on the distance detected by the distance sensor 3. The distance sensor 3 includes an infrared modulated spectrum reflection intensity detection device or an infrared time-of-flight detection device. The distance sensor 3 can detect whether the palm is facing the palm brushing device and measure the distance between the palm and the palm brushing device.

[0031] In some examples, as shown in the upper portion of FIG1 , when the distance sensor 3 detects that the distance to the palm is a first distance, the controller 4 adjusts the field of view angle of the light reflected by the DMD reflector 2 to the first field of view angle. As shown in the lower portion of FIG1 , when the distance sensor 3 detects that the distance to the palm is a second distance, the controller 4 adjusts the field of view angle of the light reflected by the DMD reflector 2 to the second field of view angle. The first distance is less than the second distance, and the first field of view angle is greater than the second field of view angle.

[0032] In this way, when the palm is close to the palm brushing device, the viewing angle of the reflected light of the DMD reflector 2 is larger. When the palm is far from the palm brushing device, the viewing angle of the reflected light of the DMD reflector 2 is smaller.

[0033] In some examples, the lighting system includes a plurality of distance sensors 3 .

[0034] Among them, since the palm is not always located directly above the DMD reflector 2, multiple distance sensors 3 are provided to accurately obtain the position of the palm (i.e., the spatial position), so that the controller 4 can more accurately control the deflection angle of each pixel reflector 2. Among them, the spatial position includes the distance between the palm and the palm-brushing device, and the distance the palm is offset relative to the central axis of the palm-brushing device. For example, through the detection of multiple distance sensors 3, the specific position of the palm in the camera acquisition area can be determined, such as in the middle of the acquisition area, upper left, lower left, upper right or lower right. Among them, the acquisition area is located above the lighting system and is divided into four areas: upper left, lower left, upper right and lower right by the horizontal and vertical coordinate axes.

[0035] In some examples, the controller 4 is configured to determine the spatial position of the palm based on the distances detected by the multiple distance sensors 3. Based on the spatial position of the palm, the angles of the multiple pixel mirrors 21 are adjusted to adjust the direction and field of view of the reflected light from the DMD mirror 2 so that the reflected light better illuminates the palm.

[0036] For example, as shown in FIG3 to FIG5 , when it is determined that the palm is located directly above the DMD reflective mirror 2 , the central light of the reflected light of the DMD reflective mirror 2 is controlled to face directly upward.

[0037] For another example, as shown in FIG6 , when it is determined that the palm is located at the upper left of the DMD reflective mirror 2 , the reflected light of the DMD reflective mirror 2 is controlled to be reflected toward the upper left as a whole.

[0038] In some examples, as shown in FIG. 2 , a plurality of pixel reflectors 21 are arranged in an array, and the deflection angles of the plurality of pixel reflectors 21 are different, thereby reflecting light to different angles.

[0039] As shown in FIG3 , when the palm is close to the DMD reflector 2 , the multiple pixel reflectors 21 reflect the incident light to the palm, and the field angle of the reflected light is large, so that the reflected light can cover the palm.

[0040] As shown in Figure 4, when the palm is far away from the DMD reflector 2, the reflected light from the multiple pixel reflectors 21 converges toward the center, making the field of view of the reflected light smaller, thereby increasing the light intensity. In this way, the palm can be illuminated with lower power consumption.

[0041] In addition, as shown in FIG5 , multiple pixel reflectors 21 can also reflect part of the light at the edge of the lighting lamp 1 toward the center of the palm, and reflect part of the light at the center of the lighting lamp 1 toward the edge of the palm, thereby making the brightness of the light on the palm more uniform and making the palm clearer.

[0042] In some examples, the resolution of the DMD reflector 2 is 1080P, so that the DMD reflector 2 can include more pixel reflectors 21, so that the DMD reflector 2 can more accurately adjust the field angle of the reflected light.

[0043] Of course, in other examples, the resolution of the DMD reflector 2 may be set to 540P, 720P or other resolutions according to actual needs, and the embodiments of the present disclosure do not specifically limit this.

[0044] In some examples, there is only one lighting lamp 1. Since the lighting lamp 1 does not directly illuminate the palm, but the light emitted by the lighting lamp 1 is reflected by the DMD reflector 2, and since the reflected light of the DMD reflector 2 is relatively uniform, there is no need to arrange multiple lighting lamps 1 in multiple locations, thereby reducing the overall power of the lighting system.

[0045] Of course, in other examples, the number of the lighting lamps 1 may also be multiple, and the embodiments of the present disclosure do not specifically limit this.

[0046] In some examples, the lighting lamp 1 is an LED (Light Emitting Diode), which can emit light of a specific wavelength at a certain angle and achieve different brightness changes when driven by different currents and duty cycles to meet the needs of camera image acquisition.

[0047] In some examples, the lighting lamp 1 is an infrared lamp, that is, the lighting lamp 1 emits infrared light.

[0048] In other examples, the lighting lamp 1 may also emit visible light, or emit infrared light and visible light at the same time, which is not specifically limited in the embodiments of the present disclosure.

[0049] The present disclosure also provides a palm brushing device. As shown in FIG1 , the palm brushing device includes the lighting system described above.

[0050] As shown in FIG1 , the palm scanning device further includes a camera 5 , which is used to obtain a palm image.

[0051] The technical solution provided by the embodiment of the present disclosure is that the field of view of the lighting system in the palm-brushing device when illuminating the palm is adjustable, so that the palm-brushing device (camera 5) can obtain a clear palm image whether the palm is close to or far away from the palm-brushing device.

[0052] The above descriptions are merely optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A lighting system, the lighting system being applied to a palm brushing device, the lighting system comprising a lighting lamp (1) and a digital micromirror device (DMD) reflector (2); The DMD reflector (2) is located on the outgoing light path of the lighting lamp (1); The DMD reflector (2) comprises a plurality of pixel reflectors (21), and the angles of the plurality of pixel reflectors (21) are adjustable, so that the viewing angle of the reflected light of the DMD reflector (2) is adjustable.

2. The lighting system according to claim 1, wherein the viewing angle of the lighting lamp (1) is 20°-60°, and the viewing angle of the reflected light of the DMD reflector (2) is 90°-120°.

3. The lighting system according to claim 1, further comprising a distance sensor (3) and a controller (4); The distance sensor (3) is used to detect the distance from the palm; The controller (4) is electrically connected to the DMD reflector (2) and the distance sensor (3), and the controller (4) is used to adjust the angles of the multiple pixel reflectors (21) according to the distance detected by the distance sensor (3).

4. The lighting system according to claim 3, when the distance from the palm detected by the distance sensor (3) is a first distance, the controller (4) adjusts the field of view angle of the reflected light of the DMD reflector (2) to the first field of view angle; When the distance from the palm detected by the distance sensor (3) is a second distance, the controller (4) adjusts the field of view angle of the reflected light of the DMD reflector (2) to the second field of view angle; in, The first distance is smaller than the second distance, and the first field of view angle is larger than the second field of view angle.

5. The lighting system according to claim 3, comprising a plurality of said distance sensors (3).

6. The lighting system according to claim 5, wherein the controller (4) is used to determine the spatial position of the palm according to the distances detected by the plurality of distance sensors (3); Based on the spatial position of the palm, the angles of the plurality of pixel reflectors (21) are adjusted to adjust the direction and field angle of the reflected light of the DMD reflector (2).

7. The lighting system according to any one of claims 1 to 6, wherein the plurality of pixel reflectors (21) are arranged in an array.

8. According to the lighting system according to any one of claims 1 to 6, the resolution of the DMD reflector (2) is 1080P.

9. The lighting system according to any one of claims 1 to 6, wherein the number of the lighting lamp (1) is one.

10. The lighting system according to any one of claims 1 to 6, wherein the lighting lamp (1) is a light emitting diode (LED).

11. The lighting system according to any one of claims 1 to 6, wherein the lighting lamp (1) is an infrared lamp.

12. A palm-brushing device, comprising the lighting system according to any one of claims 1-11.

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