Lens module and manufacturing method thereof

Abstract

The present invention provides a lens module and a manufacturing method thereof. The manufacturing method includes: providing a working mold, one side surface of the working mold includes a plurality of protrusions or depressions and a planar area located on the periphery of the protrusions or depressions, and a serial number mark is formed on the planar area of the working mold; providing a substrate, and forming a first lens layer on the surface of the substrate and a first light shielding layer; aligning and pressing the first lens layer located between the working mold and the substrate to form a plurality of first lenses, and transferring the serial number mark on the working mold to the planar area of the first lens. In the present invention, the serial number mark is transferred to the surface of the first lens by a transfer method, and the serial number mark has better recognition and is convenient for tracking. The first light shielding layer does not need to be etched and damaged to form a serial number mark, which ensures the integrity of the first light shielding layer, avoids stray light from entering through the etched and damaged area, can achieve a better light shielding effect, and is beneficial to the final imaging; moreover, only one light shielding layer is used, saving the process.

Description

Technical Field

[0001] The present invention belongs to the field of camera module manufacturing, and particularly relates to a lens module and a manufacturing method thereof. Background Art

[0002] The main components of a lens module include a lens and an image sensor. Its main working principle is as follows: The optical image generated by the scene through the lens is projected onto the surface of the image sensor and converted into an electrical signal. The lens is composed of different lens combinations and is an important part of the lens module, playing a crucial role in the imaging effect. The quality of the lens mainly determines the picture clarity, the image display range, and at the same time affects the maximum pixel. The image sensor is the core module of the lens module, which converts light into an electrical signal.

[0003] In order to have traceability and distinguish different lens module individuals, it is usually necessary to make a serial number mark on each lens module. A serial number mark of a lens module is formed on the light-shielding layer in the lens module through an etching process. However, there is a problem of stray light incident on the serial number mark area on the light-shielding layer, and it requires two processes to form the light-shielding layer, and the process is relatively complex. Summary of the Invention

[0004] The purpose of the present invention is to provide a lens module and a manufacturing method thereof. In the present invention, the serial number mark is transferred to the surface of the first lens by a transfer method, and the serial number mark has better recognition and is convenient for tracking. The first light-shielding layer does not need to be etched and damaged to form the serial number mark, so as to ensure the integrity of the first light-shielding layer and avoid stray light from entering through the etched damage, so a better light-shielding effect can be achieved, which is beneficial to the final imaging; and only one light-shielding layer is used, saving the process.

[0005] The present invention provides a manufacturing method of a lens module, including:

[0006] Forming a lens stack layer, the formation of the lens stack layer includes: providing a working mold, one side surface of the working mold includes a plurality of protrusions or depressions and a planar area located on the periphery of the protrusions or depressions, and a serial number mark is formed on the planar area of the working mold; providing a substrate, forming a first light-shielding layer on the surface of the substrate, the first light-shielding layer has a plurality of openings, and the positions of the openings correspond to the positions of the protrusions or depressions; forming a first lens layer on the surface of the substrate and the first light-shielding layer; aligning and pressing the first lens layer located between the working mold and the substrate to form a plurality of first lenses, each first lens includes a curved surface area and a planar area surrounding the curved surface area; transferring the serial number mark on the working mold to the planar area of the first lens; removing the working mold;

[0007] Cutting the lens stack layer to form a lens assembly;

[0008] Provide an image sensor, and bond the image sensor with the lens assembly to form a lens module.

[0009] Furthermore, provide the working mold, which specifically includes:

[0010] Provide a metal mold, one side surface of the metal mold includes a plurality of protrusions or depressions and a planar area located on the periphery of the protrusions or depressions, and a master serial number mark corresponding to the serial number mark is formed on the planar area of the metal mold;

[0011] Form a working mold layer on the upper surface of the metal mold, the working mold layer covers the protrusions or depressions of the metal mold and extends to cover the upper surface of the metal mold;

[0012] Provide a carrier plate, the lower surface of the carrier plate is planar; align and press the working mold layer located between the carrier plate and the metal mold to form the working mold; transfer the master serial number mark on the metal mold to the working mold by pressing, and then remove the metal mold.

[0013] Furthermore, in the process of forming the lens stack layer, after removing the working mold, it further includes:

[0014] Form a second lens layer on the side surface of the substrate away from the first lens layer; the second lens layer includes a plurality of second lenses connected together; each of the second lenses includes a curved surface area and a planar area surrounding the curved surface area; the number, size and position of the curved surface areas on the second lenses respectively correspond to the number, size and position of the curved surface areas on the first lenses.

[0015] Furthermore, the material of the working mold includes: resin; the material of the metal mold includes at least one of stainless steel, copper, nickel, and chromium.

[0016] Furthermore, after bonding the image sensor with the lens assembly, the manufacturing method further includes:

[0017] Form a second light-shielding layer, the second light-shielding layer covers the peripheral sidewalls of the lens assembly and the peripheral sidewalls of the image sensor and the surface of the image sensor away from the first lens.

[0018] Furthermore, the side surface of the first lens where the serial number mark is formed is the end surface of the lens assembly away from the image sensor.

[0019] The present invention also provides a lens module, including:

[0020] A lens assembly, which at least includes a stacked substrate and a first lens from bottom to top; the first lens includes a curved surface area and a flat area surrounding the curved surface area; a first light-shielding layer with an opening is formed between the substrate and the first lens, and the opening corresponds to the position of the curved surface area; a serial number mark is formed on the flat area of the surface of the first lens away from the substrate;

[0021] An image sensor, which is bonded to the lens assembly.

[0022] Further, a second lens is formed on the surface of the substrate away from the first lens, and the second lens includes a curved surface area and a flat area surrounding the curved surface area; the number, size and position of the curved surface areas on the second lens respectively correspond to the number, size and position of the curved surface areas on the first lens.

[0023] Further, a support portion is arranged on the flat area on the periphery of the second lens in a direction perpendicular to the substrate, and the bottom of the support portion is bonded to the image sensor; an air layer is formed between the second lens and the image sensor.

[0024] Further, the lens module further includes: a second light-shielding layer, which covers the peripheral side wall of the lens assembly, the peripheral side wall of the image sensor, and the surface of the image sensor away from the first lens.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention provides a lens module and a manufacturing method thereof. The manufacturing method includes: forming a lens stack layer, and the formation of the lens stack layer includes: providing a working mold, one side surface of the working mold includes a plurality of protrusions or depressions and a planar area located on the periphery of the protrusions or depressions, and a serial number mark is formed on the planar area of the working mold; providing a substrate, forming a first light-shielding layer on the surface of the substrate, the first light-shielding layer has a plurality of openings, and the positions of the openings correspond to the positions of the protrusions or depressions; forming a first lens layer on the surfaces of the substrate and the first light-shielding layer; aligning and pressing the first lens layer located between the working mold and the substrate to form a plurality of first lenses, each first lens includes a curved surface area and a planar area surrounding the curved surface area; transferring the serial number mark on the working mold to the planar area of the first lens; removing the working mold; cutting the lens stack layer to form a lens assembly; providing an image sensor, and bonding the image sensor with the lens assembly to form a lens module. In the present invention, the serial number mark is transferred to the surface of the first lens by a transfer method, which has better recognition and is convenient for tracking. It avoids the damage to the light-shielding layer caused by etching the serial number mark on the existing light-shielding layer, thereby causing stray light to enter; the first light-shielding layer does not need to be etched and damaged, which can ensure the integrity of the first light-shielding layer. The area in the thickness direction corresponding to the serial number mark is blocked by the first light-shielding layer and is not transparent, so a better light-shielding effect can be achieved, and the final imaging effect is good; moreover, only one light-shielding layer is used, saving additional light-shielding layer processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. is a schematic structural diagram of a lens module.

[0028] Figure 2 FIG. is a schematic flow chart of the manufacturing method of the lens module according to an embodiment of the present invention.

[0029] Figures 3 to 8 FIGS. are schematic diagrams of each step of the manufacturing method of the lens module according to an embodiment of the present invention.

[0030] Among them, the reference numerals are as follows:

[0031] 01 - Lens 1; 02 - First light-shielding layer; 03 - Serial number mark; 04 - Glass substrate; 05 - Second light-shielding layer; 06 - Lens 2; 07 - Image sensor chip;

[0032] 11 - Metal mold; 12 - Working mold; 13 - Carrier plate; 14 - Serial number mark; 15 - Substrate; 16 - First light-shielding layer; 17 - First lens; 18 - Second lens; 19 - Support part; 20 - Image sensor; 21 - Second light-shielding layer; 22 - Solder ball. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] As described in the background art, there is a problem of stray light incident on the serial number marking area of the light-shielding layer of a lens module, and a process of forming the light-shielding layer twice is required, which is relatively complex.

[0034] Specifically, as Figure 1 shown, Figure 1 FIG. is a schematic structural diagram of a lens module. Above the image sensor chip 07, a second lens 06, a glass substrate 04, and a first lens 01 are sequentially arranged; a first light-shielding layer 02 is arranged between the first lens 01 and the glass substrate 04. A serial number mark 03 is formed in the first light-shielding layer 02 by photolithographic patterning. During the process of forming the serial number mark 03 by patterning, part of the first light-shielding layer 02 is etched away to form a gap. By sacrificing the integrity of the first light-shielding layer 02, the serial number mark 03 of the lens is etched on the first light-shielding layer 02. Stray light is likely to enter from the gap in the area of the serial number mark 03, and there is a risk of stray light incident in the area of the serial number mark 03. To make corresponding improvements, a second light-shielding layer 05 is further arranged between the second lens 06 and the glass substrate 04. In this process, two light-shielding layer processes (the first light-shielding layer 02 and the second light-shielding layer 05) are carried out, and the process is relatively complex. However, there is still a problem of stray light incident in the area of the serial number mark 03, and the light-shielding performance is poor.

[0035] Based on the above research, the present invention provides a lens module and a manufacturing method thereof. The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0036] For the sake of description, some embodiments of the present application may use spatial relative terms such as "above", "below", "top", "bottom", etc. to describe the relationship between one element or component and another (or other) element or component as shown in the drawings of the embodiments. It should be understood that in addition to the orientations described in the drawings, the spatial relative terms are also intended to include different orientations of the device during use or operation. For example, if the device in the drawing is flipped, the element or component described as "below" or "beneath" other elements or components will then be positioned "above" or "on top of" other elements or components. The terms "first", "second", etc. in the following are used to distinguish between similar elements and are not necessarily used to describe a specific order or time sequence. It should be understood that these terms can be replaced under appropriate circumstances.

[0037] An embodiment of the present invention provides a manufacturing method of a lens module, as Figure 2 shown, including:

[0038] Step S1: Form a lens stack layer. The formation of the lens stack layer includes: providing a working mold, one side surface of the working mold includes a plurality of protrusions or depressions and a planar area located on the periphery of the protrusions or depressions, and a serial number mark is formed on the planar area of the working mold; providing a substrate, forming a first light-shielding layer on the surface of the substrate, the first light-shielding layer has a plurality of openings, and the positions of the openings correspond to the positions of the protrusions or depressions; forming a first lens layer on the surface of the substrate and the first light-shielding layer; aligning and pressing the first lens layer between the working mold and the substrate to form a plurality of first lenses, each first lens includes a curved surface area and a planar area surrounding the curved surface area; transferring the serial number mark on the working mold to the planar area of the first lens; removing the working mold;

[0039] Step S2: After cutting the lens stack layer, a lens assembly is formed;

[0040] Step S3: Provide an image sensor, and bond the image sensor with the lens assembly to form a lens module.

[0041] The following will Figures 3 to 8 introduce in detail each step of the manufacturing method of the lens module according to the embodiments of the present invention.

[0042] As Figure 3 and Figure 4 shown, provide a working mold 12, specifically including: providing a metal mold 11, one side surface of the metal mold 11 includes a plurality of protrusions or depressions and a planar area located on the periphery of the protrusions or depressions, Figure 3 The case of the depression is shown in , and the size of the protrusion or depression is related to the size of the first lens to be formed subsequently. A master plate serial number mark is formed on the planar area of the metal mold 11; a working mold layer is formed on the upper surface of the metal mold 11, and the working mold layer covers the protrusions or depressions of the metal mold 11 and extends to cover the upper surface of the metal mold 11; provide a carrier plate 13, the lower surface of the carrier plate 13 is planar; align and press the working mold layer between the carrier plate 13 and the metal mold 11 to form the working mold 12; transfer the master plate serial number mark on the metal mold 11 to the working mold 12 by pressing, and then remove the metal mold 11 to form the serial number mark 14 on the working mold 12. In this embodiment, the working mold layer can be coated on the surface of the metal mold 11 by a coating process. At this time, the working mold layer is in a colloidal state with fluidity and is formed after UV curing. The material of the working mold 12 includes, for example, a photocurable resin, and the photocurable resin includes one or a mixture of several of monofunctional (meth)acrylate, difunctional (meth)acrylate, polyfunctional (meth)acrylate, ethoxylated polyfunctional acrylate, propoxylated polyfunctional acrylate, and (meth)acrylate containing hydroxyl.

[0043] The material of the carrier plate 13 can be glass. The material of the metal mold 11 includes at least one of metals such as stainless steel, copper, nickel, and chromium. With the repeated use of the metal mold 11 in the imprinting production process, the wear of the metal mold 11 will inevitably occur. The preparation process of the metal mold 11 is complex and costly, and once it is worn, it cannot be repaired. Transfer the pattern on the metal mold 11 to the working mold 12. The working mold 12 is used multiple times in the process of manufacturing the lens module. After the working mold 12 is scrapped after multiple uses, the metal mold 11 needs to be remade and reused. In this way, the usage frequency of the metal mold 11 is greatly reduced, the wear rate of the metal mold 11 is reduced, and the service life of the metal mold 11 is greatly extended.

[0044] It should be understood that in this embodiment Figure 3 only shows a metal mold 11 and a carrier plate 13 schematically, but it should not be limited to this. The shapes and sizes of the metal mold 11 and the carrier plate 13 can be designed according to the shapes and sizes of the lenses to be formed according to actual needs.

[0045] Next, as Figure 5 shown, provide a substrate 15, and form a first light-shielding layer 16 on the surface of the substrate 15. The middle area of the first light-shielding layer 16 has an opening for light to enter. The first light-shielding layer 16 is, for example, a black photoresist. The black photoresist is a material with a photosensitive effect and can be opaque after curing. Expose the black photoresist to form an opening. In this embodiment, since the first light-shielding layer 16 is formed by an exposure process, the process is simple and easy to control, and the shape and size of the first light-shielding layer 16 can be very precise. Of course, the material of the first light-shielding layer 16 is not limited to the black photoresist, and can also be a plastic or metal material, etc., so as to have stronger wear resistance and stability; the first light-shielding layer 16 can also be black paint, and the black paint can be formed by spraying and baking processes. The process for forming the first light-shielding layer 16 is not limited to the exposure process, and can also be a coating or sputtering process.

[0046] As Figure 6 shown, form a first lens layer on the surface of the substrate 15 and the first light-shielding layer 16. In this embodiment, the first lens layer can be coated on the surface of the substrate 15 and the first light-shielding layer 16 by a coating process. At this time, the first lens layer is in a colloidal state with fluidity. Provide the working mold 12, align and press the working mold 12 and the substrate 15, press the first lens layer into a fixed shape, form a plurality of first lenses 17 connected together, and heat to cure the first lens layer. Transfer the serial number mark 14 on the working mold 12 to the first lens 17 by pressing.

[0047] The first lens layer is formed into the first lens 17 (glass wafer-level lens) through a hot pressing and molding process. Each first lens 17 includes a curved surface area and a flat area surrounding the curved surface area. The curved surface area is formed by pressing the protrusions on the surface of the working mold 12, and the flat area is formed by pressing the surfaces of the working mold 12 and the substrate 15.

[0048] The serial number mark 14 on the working mold 12 is transferred to the flat area of the first lens 17; the projection of the first light-shielding layer 16 on the first lens 17 covers the area where the serial number mark 14 is located, so that the stray light incident from the area where the serial number mark 14 is located is effectively blocked by the first light-shielding layer 16. Generally, the central area of the curved surface area serves as the light-transmitting area, while the edge area of the curved surface area has astigmatism or distortion, resulting in poor imaging quality, and the flat area serves as the area for fixing the lens. The curved surface area of the first lens 17 corresponds to the opening position of the first light-shielding layer 16, and the flat area of the first lens 17 corresponds to the position of the first light-shielding layer 16. As Figure 6 and Figure 7 shown, after the first lens layer is cured, the first lens layer is demolded from the working mold 12, and the working mold 12 and the carrier plate 13 are removed.

[0049] Next, as Figure 8 shown, a second lens layer is formed on the surface of the substrate 15 on the side away from the first lens 17. The second lens layer includes a plurality of second lenses 18 connected together. Each second lens 18 includes a curved surface area and a flat area surrounding the curved surface area. The number, size, and position of the curved surface areas on the second lenses 18 respectively correspond to the number, size, and position of the curved surface areas on the first lenses 17. A support portion 19 is provided on the flat area on the circumferential side of each second lens 18 in a direction perpendicular to the substrate 15. The support portion 19 and the second lens 18 can be integrally provided or separately provided.

[0050] A lens stack layer is formed by sequentially laminating the second lens layer, the substrate 15, and the first lens layer. The wafer-level lens stack layer is cut to form a lens assembly. Specifically, as Figure 8 shown, the lens assembly includes the second lens 18, the substrate 15, and the first lens 17 from bottom to top.

[0051] Both the first lens 17 and the second lens 18 can be wafer-level glass lenses. Glass has better light transmittance and higher refractive index, which can obtain a larger amount of incident light. The substrate 15 can be made of glass. Glass has low dispersion and multi-layer coating, which can improve the image quality. The second lens 18 can also be a wafer-level resin lens. The lens of the present invention has a high degree of design freedom, a smaller module volume, better optical performance, a lower thermal expansion and contraction effect, and higher environmental temperature adaptability. The lens assembly can be designed to be square and can be modularly designed, and can be extended to a 2x2 lens module in the future. The wafer-level process is more suitable for mobile consumer electronic devices. Especially when the structure of the 3D vision transmitting end is complex, the wafer-level optical element can effectively reduce the volume and space. At the same time, the device has good consistency, light weight, low height, and high beam quality, and has a cost advantage after mass production using semiconductor processes.

[0052] Assemble the lens assembly and the image sensor 20. Specifically, glue can be applied or an adhesive layer can be formed on the image sensor 20 first; then. Align (position accurately) the lens assembly with the image sensor 20, and then bond the lens assembly and the image sensor 20 through the adhesive layer to form a lens module. Solder balls 22 are formed on the side of the image sensor 20 away from the first lens 17. An air layer is formed in the space enclosed by the second lens 18 and the image sensor 20. After the lens assembly and the image sensor 20 are assembled, a second light-shielding layer 21 can be formed; the second light-shielding layer 21 covers the peripheral side walls of the lens assembly and the image sensor 20 and the surface of the image sensor 20 on the side away from the first lens 17. The second light-shielding layer 21 prevents stray light from entering from the side wall and the bottom of the lens module and affecting the imaging quality.

[0053] Based on this, as Figure 8 shown, this embodiment also provides a lens module, including:

[0054] A lens assembly, which at least includes a stacked substrate 15 and a first lens 17 from bottom to top; the first lens 17 includes a curved surface area and a planar area surrounding the curved surface area; a first light-shielding layer 16 with an opening is formed between the substrate 15 and the first lens 17, and the position of the opening corresponds to the curved surface area in the direction perpendicular to the substrate 15 (vertically); a serial number mark 14 is formed on the planar area of the surface of the first lens 17 away from the substrate 15;

[0055] An image sensor 20, and the image sensor 20 is bonded to the lens assembly.

[0056] Specifically, a second lens 18 is formed on a surface of the substrate 15 away from the first lens 17. The second lens 18 includes a curved surface area and a flat surface area surrounding the curved surface area. The number, size, and position of the curved surface areas on the second lens 18 correspond to the number, size, and position of the curved surface areas on the first lens 17 respectively. The flat surface areas of the first lens 17 and the second lens 18 are also corresponding in position in a direction perpendicular to the substrate 15 (vertical direction).

[0057] Support portions 19 are provided on the flat surface area on the peripheral side of the second lens 18 in a direction perpendicular to the substrate 15. The bottom of the support portion 19 is bonded to the image sensor 20. An air layer is formed between the second lens 18 and the image sensor 20.

[0058] The lens module further includes a second light-shielding layer 21. The second light-shielding layer 21 covers the peripheral side walls of the lens assembly and the image sensor 20 and the surface of the image sensor 20 away from the first lens 17. The optical areas of the first lens 17 and the second lens 18 of the lens assembly overlap or are close to each other in the projection on the image sensor 20. The photosensitive surface of the image sensor 20 faces the lens assembly. The lens assembly is mounted on the photosensitive surface of the image sensor 20. The first light-shielding layer 16 is located in the flat surface area (non-optical area) between the substrate 15 and the first lens 17. The first light-shielding layer 16 prevents light from entering from the non-optical area outside the curved surface area of the first lens 17 and affecting the imaging quality. The second light-shielding layer 21 covers the peripheral side walls of the lens assembly and the peripheral side walls of the image sensor 20 and the surface of the image sensor 20 away from the second lens 18. The second light-shielding layer 21 prevents stray light from entering from the side walls and the bottom of the lens module and affecting the imaging quality.

[0059] As an alternative embodiment, the lens assembly in the present invention is not limited to including two lenses, and may also include three to six or even more lenses, which are set according to actual requirements.

[0060] In summary, the present invention provides a lens module and a manufacturing method thereof. The manufacturing method includes: providing a working mold, one surface of the working mold includes a plurality of protrusions or depressions and a flat surface area located on the periphery of the protrusions or depressions, and a serial number mark is formed on the flat surface area of the working mold; providing a substrate, and forming a first light-shielding layer having a plurality of openings on the surface of the substrate; forming a first lens layer on the surface of the substrate and the first light-shielding layer; aligning and pressing the first lens layer located between the working mold and the substrate to form a plurality of first lenses, and transferring the serial number mark on the working mold to the flat surface area of the first lens. The present invention transfers the serial number mark to the surface of the first lens by a transfer method, and the serial number mark has better recognition and is convenient for tracking. The first light-shielding layer does not need to be etched and damaged to form a serial number mark, so as to ensure the integrity of the first light-shielding layer, avoid stray light from entering from the etched and damaged area, and thus can achieve a better light-shielding effect and is beneficial to the final imaging; moreover, only one light-shielding layer is used, saving the process.

[0061] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the methods disclosed in the embodiments, since they correspond to the devices disclosed in the embodiments, the description is relatively simple. For related parts, reference can be made to the description in the method part.

[0062] The above description is only a description of the preferred embodiments of the present invention, and does not limit any scope of the rights of the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A manufacturing method of a lens module, characterized in that Including forming a lens stack layer, the formation of the lens stack layer includes: Providing a working mold, one side surface of the working mold includes a plurality of protrusions or depressions and a planar area located on the periphery of the protrusions or depressions, and a serial number mark is formed on the planar area of the working mold; Providing a substrate, forming a first light-shielding layer on the surface of the substrate, the first light-shielding layer has a plurality of openings, and the positions of the openings correspond to the positions of the protrusions or depressions; Forming a first lens layer on the surface of the substrate and the first light-shielding layer; Aligning and pressing the first lens layer located between the working mold and the substrate to form a plurality of first lenses, each first lens includes a curved surface area and a planar area surrounding the curved surface area; transferring the serial number mark on the working mold to the planar area of the first lens; removing the working mold; the projection of the first light-shielding layer on the first lens covers the area where the serial number mark is located; After cutting the lens stack layer, a lens assembly is formed; Providing an image sensor, and bonding the image sensor with the lens assembly to form a lens module.

2. The manufacturing method of the lens module according to claim 1, characterized in that Providing the working mold specifically includes: Providing a metal mold, one side surface of the metal mold includes a plurality of protrusions or depressions and a planar area located on the periphery of the protrusions or depressions, and a master serial number mark corresponding to the serial number mark is formed on the planar area of the metal mold; Forming a working mold layer on the upper surface of the metal mold, the working mold layer covers the protrusions or depressions of the metal mold and extends to cover the upper surface of the metal mold; Providing a carrier plate, the lower surface of the carrier plate is planar; aligning and pressing the working mold layer located between the carrier plate and the metal mold to form the working mold; transferring the master serial number mark on the metal mold to the working mold by pressing, and then removing the metal mold.

3. The manufacturing method of the lens module according to claim 1, wherein In the process of forming the lens stack layer, after removing the working mold, it further includes: Forming a second lens layer on the side surface of the substrate away from the first lens layer; the second lens layer includes a plurality of second lenses connected together; each second lens includes a curved surface area and a planar area surrounding the curved surface area; the number, size and position of the curved surface areas on the second lenses respectively correspond to the number, size and position of the curved surface areas on the first lenses.

4. The manufacturing method of the lens module according to claim 2, wherein, The material of the working mold includes: resin; the material of the metal mold includes at least one of stainless steel, copper, nickel, and chromium.

5. The manufacturing method of the lens module according to claim 1, characterized in that, After bonding the image sensor with the lens assembly, the manufacturing method further includes: Forming a second light-shielding layer, the second light-shielding layer covers the peripheral side walls of the lens assembly and the image sensor and the surface of the image sensor away from the first lens.

6. The manufacturing method of the lens module according to claim 1, characterized in that The side surface of the first lens with the serial number mark formed thereon is the end surface of the lens assembly away from the image sensor.

7. A lens module is formed by using the manufacturing method of the lens module according to any one of claims 1 to 6, and is characterized in that, Including: The lens assembly includes at least a substrate and a first lens stacked from bottom to top; the first lens includes a curved surface area and a flat area surrounding the curved surface area; a first light-shielding layer with an opening is formed between the substrate and the first lens, and the opening corresponds to the position of the curved surface area; a serial number mark is formed on the flat area of the surface of the first lens away from the substrate; the projection of the first light-shielding layer on the first lens covers the area where the serial number mark is located; An image sensor, which is bonded to the lens assembly.

8. The lens module according to claim 7, wherein, a second lens is formed on the surface of the substrate away from the first lens, and the second lens includes a curved surface area and a flat area surrounding the curved surface area; the number, size and position of the curved surface areas on the second lens respectively correspond to the number, size and position of the curved surface areas on the first lens.

9. The lens module according to claim 8, wherein, Support portions are provided on the flat area on the circumferential side of the second lens in a direction perpendicular to the substrate, and the bottom of the support portions is bonded to the image sensor; an air layer is formed between the second lens and the image sensor.

10. The lens module according to claim 7, wherein The lens module further includes a second light-shielding layer, which covers the circumferential side wall of the lens assembly, the circumferential side wall of the image sensor, and the surface of the image sensor away from the first lens.

Images