Camera module of brush palm recognition equipment

Abstract

The utility model provides a camera module of brush palm recognition equipment, and belongs to the technical field of optics. The brush palm identification equipment camera module comprises a lens module and an image sensor. The lens module mainly comprises a first lens assembly and a second lens assembly, the first lens assembly comprises a plastic lens and / or a spherical glass lens, and the second lens assembly comprises a free-form surface lens and / or a molded glass lens. The first lens assembly, the second lens and the image sensor are fixed in the lens barrel, and the image sensor is located on the image side of the first lens assembly and the second lens. The free-form surface lens and the molded glass lens can enlarge the field of view of the lens module, so that when the palm is close to the lens module or slightly deviates from the lens module, the lens module can obtain a complete palm image. Meanwhile, the free-form surface lens and the molded glass lens can improve the distortion of the lens module and improve the definition, thereby facilitating the acquisition of a clear palm image. Therefore, the user identity can be quickly and accurately identified.

Description

Technical Field

[0001] The present disclosure relates to the field of optical technology, and in particular to a camera module of a palm recognition device. Background Art

[0002] The camera module of the palm recognition device can obtain the user's palm image and then confirm the user's identity by identifying the palm features.

[0003] In the related art, when a user uses the camera module of a palm recognition device, he needs to place his hand above the camera module of the palm recognition device. In addition, the palm generally needs to be 5cm-15cm away from the camera module of the palm recognition device so that the camera module of the palm recognition device can obtain a clear palm image. If the palm is too close to the camera module of the palm recognition device, it will be difficult for the camera module of the palm recognition device to obtain a complete palm image, which will make it difficult for the camera module of the palm recognition device to identify the user. Utility Model Content

[0004] The present disclosure provides a camera module for a palm swiping recognition device, which can solve the technical problems existing in the related technologies. The technical solution of the camera module for the palm swiping recognition device is as follows.

[0005] The present disclosure provides a camera module for a palm recognition device, wherein the camera module for the palm recognition device comprises a lens module and an image sensor;

[0006] The lens module mainly comprises a lens barrel, a first lens assembly and a second lens assembly, wherein the first lens assembly comprises a plastic lens and / or a spherical glass lens, and the second lens assembly comprises a free-form surface lens and / or a molded glass lens;

[0007] The first lens assembly, the second lens assembly and the image sensor are fixed inside the lens barrel, and the image sensor is located at the image side of the first lens assembly and the second lens assembly.

[0008] In a possible implementation, the degree of freedom of the free-form surface lens is 30-80.

[0009] In a possible implementation, the free-form surface lens is located on the image side of the first lens assembly.

[0010] In a possible implementation, the molded glass lens has 10-30 degrees of freedom.

[0011] In a possible implementation, the first lens assembly includes three plastic lenses;

[0012] The second lens component includes the molded glass lens, the molded glass lens has two plastic lenses on the object side and one plastic lens on the image side.

[0013] In a possible implementation, the second lens assembly includes the free-form surface lens and the molded glass lens, and the free-form surface lens is located on the image side of the molded glass lens.

[0014] In a possible implementation manner, the inner wall of the lens barrel has an anti-glare coating.

[0015] In a possible implementation, the lens module is an infrared lens module;

[0016] The lens module also includes an infrared filter, which is located on the object side of the image sensor and is used to transmit infrared light and filter visible light.

[0017] In a possible implementation, the palm recognition device camera module includes two lens modules;

[0018] One of the lens modules is a visible light lens module for transmitting visible light, and the other lens module is an infrared light lens module for transmitting infrared light.

[0019] In a possible implementation, the two lens modules are arranged along a first direction, wherein the first direction is parallel to a plane where a horizontal field of view angle of the lens module is located.

[0020] In a possible implementation manner, surfaces of the first lens assembly and the second lens assembly have anti-reflection films.

[0021] The technical solution provided by the present disclosure includes at least the following beneficial effects:

[0022] The present disclosure provides a camera module of a palm recognition device, wherein the lens module in the camera module of the palm recognition device includes a first lens assembly and a second lens assembly. The lens of the second lens assembly is a free-form surface lens or a molded glass lens, or the second lens assembly includes a free-form surface lens and a molded glass lens. Both the free-form surface lens and the molded glass lens can increase the field of view of the lens module, so when the lens module is used to shoot a palm, if the palm is close to the lens module or the palm is slightly offset, the lens module can also obtain a complete palm image. At the same time, both the free-form surface lens and the molded glass lens can improve the distortion of the lens module, so that the distortion of the lens module is smaller, and the clarity is improved, thereby avoiding the distortion of the image obtained by the lens module, which is conducive to obtaining a clear palm image. In this way, when the palm is close to the lens module, the lens module can obtain a complete and clear image, which is conducive to the camera module of the palm recognition device to quickly and accurately identify the identity of the user.

[0023] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description, are used to explain the principles of the present disclosure. In the drawings:

[0025] Figure 1 is a structural schematic diagram of a camera module of a palm recognition device shown in an embodiment of the present disclosure;

[0026] Figure 2 is a structural schematic diagram of a camera module of a palm recognition device shown in an embodiment of the present disclosure;

[0027] Figure 3 is a structural schematic diagram of a camera module of a palm recognition device shown in an embodiment of the present disclosure;

[0028] Figure 4 is a structural schematic diagram of a lens module shown in an embodiment of the present disclosure;

[0029] Figure 5 is a structural schematic diagram of a lens module shown in an embodiment of the present disclosure;

[0030] Figure 6 is a structural schematic diagram of a lens module shown in an embodiment of the present disclosure;

[0031] Figure 7 is a structural schematic diagram of a camera module of a palm recognition device shown in an embodiment of the present disclosure;

[0032] Figure 8is a structural schematic diagram of a lens module shown in an embodiment of the present disclosure;

[0033] Fig. 9 is a structural schematic diagram of a camera module of a palm recognition device shown in an embodiment of the present disclosure;

[0034] Fig.10 is a structural schematic diagram of a camera module of a palm recognition device shown in an embodiment of the present disclosure;

[0035] Fig.11 It is a structural schematic diagram of a lens module shown in an embodiment of the present disclosure.

[0036] Legend:

[0037] 1. lens module, 11. lens barrel, 12. first lens assembly, 121. plastic lens, 122. spherical glass lens, 13. second lens assembly, 131. free-form surface lens, 132. molded glass lens, 14. infrared filter film, 15. anti-reflection film;

[0038] 2. Image sensor.

[0039] The above drawings show clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0040] 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.

[0041] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limit, but indicate that there is at least one. Words such as "include" or "include" mean that the elements or objects appearing in front of "include" or "include" include the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like 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.

[0042] Contactless palm recognition and payment has been proven to be a very popular method among users. It is more convenient than traditional card swiping, code scanning, etc., and safer than other biometric recognition methods such as face scanning (such as less privacy concerns, ability to distinguish between twins, etc.). According to the statistical results of a large number of users, when a user uses the camera module of a palm recognition device, the distance between the palm and the lens module of the camera module of the palm recognition device is usually 3cm-5cm. In the related art, the FOV (Field of View) of the camera module of a palm recognition device is small. When a user uses the camera module of a palm recognition device, the palm generally needs to be 5cm-15cm away from the lens. If the palm is 3cm away from the lens module, the camera module of the palm recognition device cannot obtain a complete palm image.

[0043] In the related art, some camera modules of palm recognition devices sink the lens module to increase the distance between the palm and the lens module, but this will cause the overall size of the camera module of the palm recognition device to be larger and cause dust to accumulate easily on the outside of the lens module. Therefore, without changing the position of the lens module, if you want the lens module to be able to shoot the palm at a close distance, you should use a wide-angle lens module, that is, increase the field of view of the lens module. However, traditional wide-angle lenses have large distortion and low clarity, and cannot meet the shooting requirements of palm recognition.

[0044] In view of the above technical problems, the present disclosure provides a camera module for a palm recognition device, such as Figure 1-Figure 3As shown, the camera module of the palm recognition device includes a lens module 1 and an image sensor 2. A first lens assembly 12 and a second lens assembly 13, and the second lens assembly 13 includes a free-form surface lens 131 and / or a molded glass lens 132. The first lens assembly 12, the second lens assembly 13 and the image sensor 2 are fixed inside the lens barrel 11, and the image sensor 2 is located on the image side of the first lens assembly 12 and the second lens assembly 13.

[0045] The first lens assembly 12 may include only the plastic lens 121, or only the spherical glass lens 122, or may include both the plastic lens 121 and the spherical glass lens 122 (eg, Figure 4 The present embodiment does not specifically limit the number and arrangement of the plastic lens 121 and the spherical glass lens 122. The second lens assembly 13 may only include the free-form surface lens 131 (such as Figure 1 As shown), it may also include only molded glass lens 132 (as shown Figure 2 As shown), it can also include a free-form surface lens 131 and a molded glass lens 132 (as shown Figure 3 shown).

[0046] Plastic lenses can also be called P (Plastic) lenses, spherical glass lenses can also be called G (Glass) lenses, molded glass lenses can also be called GM (Glass Moding) lenses, and free-form lenses can also be called FreeForm lenses.

[0047] The free-form surface lens 131 can increase the field of view of the lens module 1, improve the distortion of the lens module 1, and improve the RI (Relative Illumination) and MTF (Modulation Transfer Function) of the lens module 1, which is beneficial to improving the image quality.

[0048] The molded glass lens 132 has the advantages of good thermal stability, high refractive index, low dispersion, high perspective, distortion elimination and expanded field of view, so that while increasing the field of view angle of the lens module 1, the distortion of the lens module 1 can also be reduced. The molded glass lens 132 is also conducive to the use of the camera module of the palm recognition device under more stringent conditions. In addition, the traditional glass lens manufacturing technology requires complicated steps, such as rough grinding, fine grinding, polishing, etc., and the time spent is relatively increased. The production of the molded glass lens 132 only requires a glass preform, and the finished product can be pressed directly by molding, so it is very suitable for mass production. Therefore, the use of the molded glass lens 132 in the camera module of the palm recognition device can improve production efficiency and is conducive to the mass production of the camera module of the palm recognition device.

[0049] The lens module 1 and the image sensor 2 in the disclosed embodiment can also be used in a face recognition module.

[0050] The technical solution provided by the embodiment of the present disclosure is that the lens module 1 in the camera module of the palm recognition device includes a first lens assembly 12 and a second lens assembly 13. The second lens assembly 13 is a free-form surface lens 131 or a molded glass lens 132, or the second lens assembly 13 includes a free-form surface lens 131 and a molded glass lens 132. Both the free-form surface lens 131 and the molded glass lens 132 can increase the field of view of the lens module 1, so when the lens module 1 is used to shoot the palm, if the palm is close to the lens module 1 or the palm is slightly offset, the lens module 1 can also obtain a complete palm image. At the same time, both the free-form surface lens 131 and the molded glass lens 132 can improve the distortion of the lens module 1, so that the distortion of the lens module 1 is small and the clarity is improved, thereby avoiding the distortion of the image obtained by the lens module 1, which is conducive to obtaining a clear palm image. In this way, when the palm is close to the lens module 1, the lens module 1 can obtain a complete and clear image, which is conducive to the camera module of the palm recognition device to quickly and accurately identify the user's identity.

[0051] According to calculations, when the second lens assembly 13 includes a free-form surface lens 131 and a molded glass lens 132, the horizontal viewing angle of the lens module 1 can reach 125°-135°, and the vertical viewing angle can reach 115°-125°.

[0052] In some examples, the degree of freedom of the free-form surface lens 131 is 30-80. In the related art, the degree of freedom of the free-form surface lens is at most 40. The free-form surface lens 131 provided in the embodiment of the present disclosure has more degrees of freedom, so it can greatly improve the distortion of the lens module 1. Experiments have shown that the distortion rate of the lens module 1 in the horizontal direction is -13.3%, and the distortion rate in the vertical direction is -6.6%. Compared with the -35% horizontal distortion rate and -22% vertical distortion rate of the lens module in the traditional palm swiping recognition device, the distortion rate of the lens module 1 in the embodiment of the present disclosure is greatly reduced. In this way, the palm image obtained by the lens module 1 can be clearer.

[0053] In some examples, such as Figure 1 and Figure 3 As shown, the free-form surface lens 131 is located on the image side of the first lens assembly 12. When assembling the lens module 1, the lenses are placed starting from the object side of the lens module 1 and gradually arranged toward the image side. The free-form surface lens 131 is placed on the image side of the first lens assembly 12 in order to install the free-form surface lens 131 last. In this way, collision with other lenses can be avoided when installing the free-form surface lens 131.

[0054] Of course, in other examples, the free-form surface lens 131 may also be located on the object side of the first lens assembly 12. Alternatively, when the first lens assembly 12 includes a plurality of lenses, the free-form surface lens 131 may also be located inside the first lens assembly 12, that is, between the plurality of lenses of the first lens assembly 12, which is not specifically limited in the embodiments of the present disclosure.

[0055] In some examples, such as Figure 5 and Figure 6 As shown, the number of free-form surface lenses 131 can be one or more, and the embodiment of the present disclosure does not limit the number of free-form surface lenses 131. The multiple free-form surface lenses 131 can be arranged adjacent to each other in sequence, or can be arranged alternately with the multiple lenses of the first lens assembly 12.

[0056] In some examples, the molded glass lens 132 is an aspherical lens, and the degree of freedom of the molded glass lens 132 is 10-30. The molded glass lens 132 can increase the field of view of the lens module 1 and reduce the distortion of the lens module 1. The degree of freedom of the molded glass lens 132 in the lens module in the related art is usually 16. The degree of freedom of the molded glass lens 132 provided in the embodiment of the present disclosure is larger, which is conducive to further improving the field of view of the lens module 1 and reducing the distortion of the lens module 1.

[0057] Ordinary spherical glass may cause defocus due to chromatic aberration of the spherical surface, while aspherical lenses can make up for this deficiency and can clear the chromatic aberration of the spherical surface. In addition, optical imaging requires more than two or three spherical lenses to perform imaging functions, which can be replaced by an aspherical lens. In this way, the number of lenses in the lens module 1 can be reduced.

[0058] In some examples, such as Figure 3 As shown, the first lens assembly 12 includes three plastic lenses 121. The second lens assembly 13 includes a molded glass lens 132, the molded glass lens 132 has two plastic lenses 121 on the object side and one plastic lens 121 on the image side, the two plastic lenses 121, one molded glass lens 132, one plastic lens 121 and one free-form surface lens 131 are arranged in sequence, and placing the molded glass lens 132 in the middle of the multiple lenses can provide good support for the lens barrel 11.

[0059] In other examples, such as Figure 4As shown, the first lens assembly 12 may also include two plastic lenses 121 and one spherical glass lens 122, and the object side of the molded glass lens 132 has two plastic lenses 121 and the image side has one spherical glass lens 122. The disclosed embodiment does not specifically limit the number and type of lenses in the first lens assembly 12, and the relative positions of the first lens assembly 12 and the molded glass lens 132.

[0060] In some examples, such as Figure 3 As shown, the second lens assembly 13 includes a free-form surface lens 131 and a molded glass lens 132 , and the free-form surface lens 131 is located on the image side of the molded glass lens 132 .

[0061] In other examples, such as Figure 6 and Figure 7 As shown, the free-form surface lens 131 may be located on the object side of the molded glass lens 132 .

[0062] like Figure 2-Figure 7 As shown, the disclosed embodiment does not specifically limit the number and arrangement of the plastic lens 121, the spherical glass lens 122, the free-form surface lens 131, and the molded glass lens 132. The plastic lens 121, the spherical glass lens 122, the free-form surface lens 131, and / or the molded glass lens 132 can be arranged in a free combination.

[0063] Since the lens module 1 provided in the embodiment of the present disclosure has a large field of view, more light sources will enter the lens module 1, making it easier for the lens module 1 to produce glare. That is, light spots are easily generated on the palm image obtained by the lens module 1, and the light spots will cover part of the palm features, making it difficult for the camera module of the palm recognition device to identify the user's identity. In order to reduce the glare of the lens module 1, in some examples, the inner wall of the lens barrel 11 has an anti-glare coating, such as ink. In this way, the anti-glare coating can absorb part of the light, prevent the palm image from being blocked by the light spots, and facilitate the camera module of the palm recognition device to identify the user's identity.

[0064] In some examples, the lens module 1 is an infrared lens module. Figure 8 As shown, the lens module 1 further includes an infrared filter 14 , which is located on the object side of the image sensor 2 , and is used to transmit infrared light and absorb visible light.

[0065] Accordingly, the image sensor 2 is an infrared image sensor. Thus, when the surrounding environment is dark, the lens module 1 can capture the infrared image of the palm, which is beneficial for the camera module of the palm recognition device to obtain the palm features in a dark environment.

[0066] In some examples, when the lens module 1 is a visible light lens module, the lens module 1 may also have a filter for filtering infrared light and transmitting visible light.

[0067] In some examples, such as Fig. 9 As shown, the camera module of the palm recognition device includes two lens modules 1. One lens module 1 is a visible light lens module for transmitting visible light, and the other lens module 1 is an infrared light lens module for transmitting infrared light. Correspondingly, the camera module of the palm recognition device includes two image sensors 2. One image sensor 2 is a color image sensor for receiving visible light transmitted by the visible light lens module to form a color image. The other image sensor 2 is an infrared image sensor for receiving infrared light transmitted by the infrared lens module to form a black and white image. When the two lens modules 1 are used at the same time, more palm features can be captured, which is conducive to the camera module of the palm recognition device to quickly identify the user's identity.

[0068] It should be noted that the types, quantities and arrangements of the lenses in the visible light lens module and the infrared light lens module may be the same or different.

[0069] In some examples, such as Fig. 9 and Fig.10 As shown, the two lens modules 1 are arranged along the first direction, wherein the first direction is parallel to the plane where the horizontal field of view angle α of the lens module 1 is located. The length-to-width ratio of the overlapping area of ​​the field of view of the infrared lens module and the visible light lens module is the length-to-width ratio of the palm image finally obtained. Arranging the two lens modules 1 in the above manner can make the frame of the palm image 4:3. In this way, the image obtained by the camera module of the palm recognition device can be closer to the ratio of the palm center, and when the palm is close, it is easier to obtain a complete palm image.

[0070] Of course, in other examples, the two lens modules 1 may also be arranged in other ways according to actual needs, and the embodiments of the present disclosure do not specifically limit this.

[0071] In some examples, such as Fig.11 As shown, the surface of the first lens assembly 12 and the second lens assembly 13 has an anti-reflection film 15. The anti-reflection film 15 is used to increase the refraction of the lens module and reduce the reflection, suppress the glare of the lens module, and increase the transmittance. In this way, it is beneficial for the camera module of the palm recognition device to obtain a clearer image. Among them, each lens in the first lens assembly 12 and each lens in the second lens assembly 13 are coated with an anti-reflection film.

[0072] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A palm recognition device camera module, characterized in that: The palm recognition device camera module comprises a lens module (1) and an image sensor (2); The lens module (1) comprises a lens barrel (11), a first lens assembly (12) and a second lens assembly (13), wherein the first lens assembly (12) comprises a plastic lens (121) and / or a spherical glass lens (122), and the second lens assembly (13) comprises a free-form surface lens (131) and / or a molded glass lens (132); The first lens assembly (12), the second lens assembly (13) and the image sensor (2) are fixed inside the lens barrel (11), and the image sensor (2) is located on the image side of the first lens assembly (12) and the second lens assembly (13).

2. The palm recognition device camera module according to claim 1, characterized in that: The degree of freedom of the free-form surface lens (131) is 30-80.

3. The palm recognition device camera module according to claim 2, characterized in that: The free-form surface lens (131) is located on the image side of the first lens assembly (12).

4. The palm recognition device camera module according to claim 1, characterized in that: The molded glass lens (132) has a degree of freedom of 10-30.

5. The camera module of palm recognition device according to claim 1, characterized in that: The first lens assembly (12) comprises three plastic lenses (121); The second lens assembly (13) includes the molded glass lens (132), wherein the molded glass lens (132) has two plastic lenses (121) on the object side and one plastic lens (121) on the image side.

6. The palm recognition device camera module according to claim 1, characterized in that: The second lens assembly (13) includes the free-form surface lens (131) and the molded glass lens (132), wherein the free-form surface lens (131) is located on the image side of the molded glass lens (132).

7. The camera module of palm recognition device according to claim 1, characterized in that: The inner wall of the lens barrel (11) is provided with an anti-glare coating.

8. The camera module of the palm recognition device according to any one of claims 1 to 7, characterized in that: The lens module (1) is an infrared lens module; The lens module (1) further comprises an infrared filter (14), wherein the infrared filter (14) is located on the object side of the image sensor (2), and the infrared filter (14) is used to transmit infrared light and filter visible light.

9. The camera module of the palm recognition device according to claim 8, characterized in that: The palm recognition device camera module comprises two lens modules (1); One of the lens modules (1) is a visible light lens module for transmitting visible light, and the other of the lens modules (1) is an infrared light lens module for transmitting infrared light.

10. The camera module of the palm recognition device according to any one of claims 1 to 7, characterized in that: The surfaces of the first lens assembly (12) and the second lens assembly (13) are provided with anti-reflection films (15).

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