Lens module and camera module including the same

Abstract

A lens module is provided. The lens module includes at least one distributed refractive index lens and a lens barrel configured to accommodate the at least one distributed refractive index lens, wherein the at least one distributed refractive index lens is composed of a single layer and includes a plastic material.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2020-0155174 filed on November 19, 2020, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety for all purposes by reference. Technical Field

[0003] The following description relates to a lens module and a camera module including the lens module. Background Art

[0004] Recently, camera modules have been routinely implemented in mobile communication terminals such as (but not limited to) smart phones. According to the high-resolution trend of smartphone cameras, it is advantageous to shorten and lighten the lens module (a key component of the camera module). It is also beneficial to improve the development of module structure and improve the performance of lens materials. The camera modules of current mobile devices requiring high resolution generally adopt a combination of 6 or more aspherical lenses. The use of a combination of multiple aspherical lenses may lead to an increase in lens assembly cost and manufacturing cost due to the increase in the number of lenses used, and may also lead to an increase in manufacturing cost and quality cost according to the need for a high level of assembly alignment. In addition, in response to the demand for thinning mobile devices, a large number of lenses may be disadvantageous for achieving a small form factor of the camera module. Summary of the invention

[0005] The purpose of providing this summary is to introduce a selection of inventive concepts in a concise form, and these inventive concepts will be further described in the following detailed description. This summary is not intended to identify the key features or essential features of the subject matter claimed, nor is it intended to help determine the scope of the subject matter claimed.

[0006] In a general aspect, a lens module includes at least one distributed index lens; and a lens barrel configured to accommodate the at least one distributed index lens, wherein the at least one distributed index lens is composed of a single layer and includes a plastic material.

[0007] The maximum refractive index of at least one distributed index lens may be equal to or greater than 1.75.

[0008] A difference between a maximum refractive index and a minimum refractive index of at least one distributed index lens may be equal to or greater than 0.2.

[0009] At least one distributed refractive index lens may include an organic polymer and inorganic particles.

[0010] The organic polymer may include at least one of polycarbonate (PC) and polymethyl methacrylate (PMMA).

[0011] The refractive index of the inorganic particles may be equal to or greater than 2.0.

[0012] The diameter of the inorganic particles may be less than or equal to 10 nm.

[0013] The inorganic particles may include ZrO 2 、TiO 2 、ZnS、BaTiO 3 ,Si and WO 3 One or more of .

[0014] The content distribution of the inorganic particles may vary continuously within at least one distributed refractive index lens.

[0015] At least one distributed index lens may have a continuously varying refractive index.

[0016] At least one distributed index lens may have a continuously increasing or continuously decreasing refractive index.

[0017] The lens module may also include one or more lenses configured to be received in the lens barrel.

[0018] At least one of the plurality of lenses may include an organic polymer and inorganic particles.

[0019] In general terms, a camera module includes a lens barrel configured to accommodate at least one distributed index lens; a housing including the lens barrel; and an image sensor module coupled to the housing, wherein the at least one distributed index lens is composed of a single layer and includes a plastic material.

[0020] At least one distributed refractive index lens may include an organic polymer and inorganic particles.

[0021] At least one distributed index lens may have a continuously varying refractive index.

[0022] In general, an electronic device includes a camera module, the camera module including a housing; at least one single-layer distributed refractive index lens disposed in the housing; and at least one lens disposed in the housing; wherein the at least one single-layer distributed refractive index lens and the at least one lens are formed of a plastic material.

[0023] At least one single-layer distributed refractive index lens may include an organic polymer and inorganic particles.

[0024] At least one single-layer distributed refractive index lens may be disposed at an object-side surface of the camera module, and at least one lens may be disposed at an image-side surface of the camera module.

[0025] Other features and aspects will become apparent from the following detailed description, the accompanying drawings, and the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a cross-sectional view of an exemplary camera module according to one or more embodiments.

[0027] Figure 2 is a cross-sectional view of an exemplary camera module according to one or more embodiments.

[0028] Figure 3 is a flow chart illustrating a process of manufacturing a portion of a lens according to one or more implementations.

[0029] Figure 4 is a perspective view showing a portion of a lens according to one or more embodiments.

[0030] Figure 5 It shows that according to Figure 4 A plan view of the upper surface of a lens of an embodiment.

[0031] Figure 6 and Figure 7 Schematically shows the interior of a lens according to one or more embodiments, and is Figure 5 Cross-sectional view I-I'.

[0032] Throughout the drawings and detailed description, unless otherwise described or provided, the same reference numerals will be understood to refer to the same elements, features and structures. For the purposes of clarity, illustration and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions and depictions of the elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0033] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the method, device and / or system described in the present application. However, various changes, modifications and equivalences of the method, device and / or system described in the present application will be apparent after understanding the disclosure of the present application. For example, the order of operations described in the present application is merely an example, and except for the operations that must occur in a specific order, it is not limited to the order set forth in the present application, but can be changed, which will be apparent after understanding the disclosure of the present application. In addition, in order to increase clarity and conciseness, the description of features known after understanding the disclosure of the present application can be omitted, but it should be noted that the omission of features and their descriptions is not intended to admit that they belong to common knowledge.

[0034] The features described in this application can be implemented in different forms and should not be understood as being limited to the examples described in this application. Rather, the examples described in this application are provided only to illustrate some of the many possible ways to implement the methods, devices and / or systems described in this application that will be apparent after understanding the disclosure of this application.

[0035] Although the terms "first", "second" and "third" may be used in this application to describe various members, components, regions, layers or parts, these members, components, regions, layers or parts are not limited by these terms. More specifically, these terms are only used to distinguish one member, component, region, layer or part from another member, component, region, layer or part. Therefore, without departing from the teachings of the examples described in this application, the first member, first component, first region, first layer or first part mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second part.

[0036] Throughout the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, no other elements may be present between the element and the other element.

[0037] The terms used in this application are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a", "an" and "the" are intended to also include plural forms. The words "include", "comprise" and "have" indicate the presence of the features, numbers, operations, components, elements and / or their combinations, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or their combinations.

[0038] Unless otherwise defined, all terms (including technical and scientific terms) used in this application have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs after understanding the disclosure of the present application. Terms such as those defined in commonly used dictionaries will be interpreted as having the same meaning as their meaning in the context of the relevant technology and the disclosure of the present application, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this application.

[0039] When defining the terms of directions, the optical axis direction is based on the vertical direction of the lens barrel 10 .

[0040] Figure 1 is a cross-sectional view of an exemplary camera module according to one or more embodiments, and Figure 2 is a cross-sectional view of an exemplary camera module according to one or more embodiments.

[0041] Reference Figure 1 , an example camera module 500A according to one or more embodiments includes a lens module 100 , a housing 200 , and an image sensor module 300 .

[0042] The lens module 100 is accommodated in the housing 200. In an example, the housing 200 may have upper and lower portions that are opened, and the lens module 100 is accommodated in an inner space of the housing 200.

[0043] The image sensor module 300 may be disposed below the housing 200. The image sensor module 300 is a device that converts light incident through the lens module 100 into an electrical signal. In an example, the image sensor module 300 may include a printed circuit board 310 and an image sensor 330 connected to the printed circuit board 310, and may further include an infrared filter 350.

[0044] The infrared filter 350 may block light in the infrared region among the light incident through the lens module 100. The image sensor 330 converts the light incident through the lens module 100 into an electrical signal. In a non-limiting example, the image sensor 330 may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The electrical signal converted by the image sensor 330 is output as an image through the display unit. The image sensor 330 may be fixed to the printed circuit board 310 and may be electrically connected to the printed circuit board 310 by wire bonding.

[0045] Hereinafter, each configuration of the examples will be described in more detail.

[0046] The lens module 100 may include a lens barrel 10 , a distributed refractive index lens G disposed in the lens barrel 10 , and a plurality of lenses L.

[0047] The lens barrel 10 may have a cylindrical shape so that at least one lens L configured to image a subject may be accommodated therein. Figure 1 The distributed refractive index lens G and a plurality of lenses L may be disposed on or in front of the camera module 500A, and the distributed refractive index lens G and a plurality of lenses L may be disposed within the lens barrel 10 along the optical axis.

[0048] The refractive index distribution lens G and / or the plurality of lenses L in the lens barrel 10 may include an optical portion and a flange portion. The optical portion may be configured to refract light reflected from an object, and the flange portion may be configured to fix the lens to the lens barrel 10.

[0049] When a plurality of distributed index lenses G and / or a plurality of lenses L are provided, the distributed index lenses G and / or the plurality of lenses L may have different diameters, respectively, and the lens barrel 10 may have a stepped inner surface to accommodate the distributed index lenses G and the plurality of lenses L having various diameters. In addition, the distributed index lenses G and / or the plurality of lenses L may have shapes different from each other.

[0050] exist Figure 1 In the example of , the refractive index distribution lens G and the plurality of lenses L may have a convex shape. However, this is merely an example, and the plurality of lenses L may have different shapes, including a concave shape or an uneven shape, depending on the purpose and embodiment.

[0051] In an example, the lens barrel 10 may be formed to have inner diameters of various widths.

[0052] The refractive index distribution lens G and / or the plurality of lenses L may be sequentially stacked in the lens barrel 10 to be configured. Figure 1 In this example, three lenses G1, L1, and L2 are shown. However, the three lenses G1, L1, and L2 are only one example, and the examples may include at least three lenses or less than three lenses.

[0053] In an example, a greater number of lenses may be included, or a smaller number of lenses may also be included, depending on the resolution to be achieved.

[0054] The distributed index lens G is called a gradient index (GRIN) lens, and there is a continuous change in refractive index in the lens material of the distributed index lens G. That is, in the distributed index lens G, the refractive index within the lens may have a gradient, slope, or inclination, and may change continuously.

[0055] In addition, the direction in which the refractive index has an inclination is not limited to this, and may increase from the first surface toward the second surface of the refractive index distributed lens G, or may decrease from the first surface toward the second surface of the refractive index distributed lens G, and may change irregularly inside the refractive index distributed lens G.

[0056] The radiated light or light is continuously bent in the refractive index distribution lens G, and the focusing characteristics can be determined by the change of the refractive index in the lens material. Compared with the structure in the past in which a plurality of lenses with different refractive indices are provided for changing the refractive index, the number of lenses implemented can be reduced by using the refractive index distribution lens G according to the example, and therefore, the thickness of the entire lens module 100 can be reduced, so that the entire component can be thinner.

[0057] In the example of the distributed index lens G, the maximum refractive index (RI max ) may be 1.75 or greater, and the maximum refractive index (RI max ) and minimum refractive index (RI min ) is 0.1 or more, preferably 0.2 or more. However, the examples are not limited thereto.

[0058] In an example, by using the distributed index lens G in the mobile camera modules 500A and 500B, a refractive index difference may be obtained while reducing the number of lenses in the camera modules.

[0059] The plurality of lenses L may include respective lenses L1 and L2, and may be conventional lenses having a constant refractive index unlike the above-described distributed index lens G.

[0060] exist Figure 1 In the example of FIG. 1 , the lens module 100 is shown to include a refractive index distribution lens G1 and lenses L1 and L2. However, in some examples, a single-layer refractive index distribution lens G1 may be implemented without lenses L1 and L2. In this example, the module may have a structure of a lens module 100 including a single-layer refractive index distribution lens G1 instead of a plurality of lenses.

[0061] In addition, Figure 1 In the example, a structure in which the refractive index distribution lens G1, the lens L1 and the lens L2 are sequentially arranged from the object side to the imaging side can be realized. However, in the example, the arrangement of each lens in the plurality of lenses can be arbitrarily changed according to the corresponding example. In the example, the refractive index distribution lens G1 can also be arranged between the plurality of lenses L.

[0062] In the lens module 100 and the camera modules 500A and 500B according to the example ( Figure 2 ), the refractive index distribution lens G and the plurality of lenses L may include a plastic material. In the example of the refractive index distribution lens G and the plurality of lenses L including the example of the plastic material, there is an advantage in that the weight can be much lighter than that of the lens including the glass material, and in terms of cost, the production cost can be reduced, thereby achieving an effect of improving productivity.

[0063] In addition, refer to Figure 3 and Figure 4 Regarding the specific material of the refractive index distribution lens G according to the example, the refractive index distribution lens G (including plastic material) may include an organic-inorganic composite material 13, which is a composite material of an organic polymer 11 and inorganic particles 12, and the organic polymer 11 and the inorganic particles 12 may be optical polymers and inorganic nanoparticles, respectively.

[0064] In addition, according to an example, the refractive index distribution lens G can have a structure having a refractive index slope by embedding nanoscale particles in an organic matrix, and the nanoscale particles dispersed in a liquid curable matrix can be cured using a potential difference to move within the matrix, thereby forming a refractive index slope.

[0065] In addition, the organic-inorganic composite material 13 may have a structure in which inorganic nanoparticles are distributed in an inorganic oxide gel to form a composite with a polymer compound.

[0066] Thus, the organic-inorganic composite material 13 may have a structure in which the nano-scale inorganic particles 12 are dispersed in the organic polymer 11 , and thus, it may be used as a high refractive index optical material compared to a single material of the organic polymer 11 .

[0067] The inorganic particles 12 may be distributed in the organic polymer 11 so that the content thereof varies continuously, and the boundaries between regions in which different contents are distributed may be unclear. In addition, the inorganic particles 12 may be distributed so as to have an increasing or decreasing tendency in any direction within the organic polymer 11. In addition, the content of the inorganic particles 12 may also be distributed so as to increase and then decrease, or may be distributed so as to decrease and then increase the content of the inorganic particles 12.

[0068] The organic polymer 11 may include an organic material having a high refractive index. For example, the organic polymer 11 may include any desired known plastics, and may include one or more of polyacrylic acid, polymethacrylic acid, polyacrylate, polymethacrylate, polymethyl methacrylate (PMMA), polyolefin, polystyrene, polyamide, polyimide, a polyethylene compound such as polyvinyl chloride, polyvinyl alcohol, polyvinyl butyral, polyvinyl acetate, poly(ethylene-vinyl acetate), polyester, polyethylene terephthalate, polydiallyl phthalate, polycarbonate, polyether, polyoxymethylene, polyethylene oxide, polyether ketone, polysulfone, polyepoxide, fluorine-containing polymer, polytetrafluoroethylene, and organopolysiloxane.

[0069] The inorganic particles 12 may include one or more compounds that can be polycondensed by hydrolysis of silicon (Si), aluminum (Al), boron (B), lead (Pb), tin (Sn), titanium (Ti), zirconium (Zr), vanadium (V), tungsten (W) and zinc (Zn), in particular, compounds of silicon (Si), aluminum (Al), titanium (Ti) and zirconium (Zr) or mixtures thereof. For example, the inorganic particles 12 may also include zirconium oxide (ZrO 2 ), titanium oxide (TiO 2 ), zinc sulfide (ZnS), barium titanate (BaTiO 3 ), silicon (Si) crystal, amorphous silicon (Si) and tungsten oxide (WO 3 ), but other high refractive index nano inorganic particles can also be used, but are not limited to these.

[0070] In the example of the inorganic particles 12, inorganic particles having a refractive index of 2.0 or higher can be used. Therefore, since the refractive index distribution lens G according to the example can have a structure of the organic-inorganic composite material 13 in which the inorganic particles 12 are dispersed in the organic polymer 11 as described above, the inclination of the refractive index can be controlled by controlling the volume ratio or content of the inorganic particles 12. In the example, as the content of the inorganic particles 12 distributed in the organic-inorganic composite material 13 increases, the refractive index of the refractive index distribution lens G can increase. In addition, even in the same refractive index distribution lens G, a region with a high content of the inorganic particles 12 can have a higher refractive index than other regions with a low content of the inorganic particles 12.

[0071] In the example, regarding the size of the inorganic particles 12, the diameter of the inorganic particles 12 may be 10 nm or less. When the diameter of the inorganic particles 12 is too large, the transmittance of the lens may decrease due to a scattering phenomenon, and the example inorganic particles 12 may be distributed in the organic polymer 11 while maintaining a small size.

[0072] Reference Figure 1 , you can set the object based on Figure 1 5 , and shows that the refractive index distribution lens G1 is formed to increase the content of the inorganic particles 12 from a first surface of the camera module close to the object toward a second surface far from the object and close to the imaging surface.

[0073] Therefore, in Figure 1 In the example of the refractive index distribution lens G1, a refractive index slope can be formed so that the refractive index increases from a first surface close to the object toward a second surface away from the object. However, the refractive index distribution lens G according to the example is not limited to this structure, and the distribution of the inorganic particles 12 can be changed according to use and design.

[0074] In an example, the content of the inorganic particles 12 may decrease from a first object side surface close to the object to a second image side surface far from the object of the refractive index distribution lens G. In this example, a refractive index slope in which the refractive index decreases from a first surface (e.g., the object side surface) toward a second surface (e.g., the image side surface) of the refractive index distribution lens G may be formed.

[0075] In addition, as another example, the content of the inorganic particles 12 can be formed to change from the first surface of the refractive index distribution lens G close to the object toward the second surface far from the object, so that the content of the inorganic particles 12 can have a maximum or minimum refractive index value in any area between the first surface and the second surface. In this example, the refractive index slope can be formed to have a maximum or minimum refractive index value in any area between one surface and the other surface of the refractive index distribution lens G.

[0076] In an example, the plurality of lenses L other than the distributed refractive index lens G may also include the above-described organic-inorganic composite material 13. However, unlike the above-described distributed refractive index lens G, the inside of the lens L may have a constant refractive index regardless of the region.

[0077] In the example, refer to Figure 1 and 2 , which shows the arrangement of the inorganic particles 12 in the refractive index distribution lens G1. However, as shown in the figure, the inorganic particles 12 may be distributed while forming a layer, or the inorganic particles 12 may be distributed without forming a layer. In other words, the boundary may not be divided according to the content of the inorganic particles 12, and the inorganic particles 12 may be irregularly distributed with only a tendency to increase or decrease.

[0078] The refractive index distribution lens G and / or the plurality of lenses L may be sequentially stacked inside the lens barrel 10 to be configured to be sequentially stacked, and a spacer may be provided between the refractive index distribution lens G and / or the plurality of lenses L to maintain the gap between the lenses and block unnecessary light. The spacer may be coated with a light blocking material, or a light blocking film may be attached to block unnecessary light. In addition, the spacer may be made of an opaque material. For example, the spacer may be made of a non-ferrous metal such as copper or aluminum.

[0079] Figure 2 is a cross-sectional view of a camera module according to one or more embodiments.

[0080] Reference Figure 2 In an example of a camera module 500B according to one or more embodiments, Figure 1Compared with the camera module 500A according to the example, the difference between the two camera modules 500A and 500B is that a plurality of refractive index distribution lenses G1 and G2 are provided, and the lens L1 is provided in a single number. Therefore, in this example, the above-mentioned difference is mainly described, and the description of the configuration overlapping with the camera module 500A according to the example can be equally applied to the camera module 500B according to another example.

[0081] Reference Figure 2 In the example of the camera module 500B, a plurality of distributed refractive index lenses G1 and G2 may be provided, and the description in the camera module 500A according to the above example may be equally applied to the plurality of distributed refractive index lenses G1 and G2.

[0082] In addition, Figure 2 In the example, a structure is disclosed in which a plurality of refractive index distribution lenses G1 and G2 are arranged at a position close to an object, and a lens L1 is further arranged at a position close to an imaging surface, but this arrangement is merely an example, and according to the example, the plurality of refractive index distribution lenses G1 and G2 and the lens L1 may have any arrangement relationship.

[0083] In addition, two layers of a plurality of distributed refractive index lenses G1 and G2 may be provided. However, this is merely an example, and more than two additional distributed refractive index lenses G may be provided. By providing a plurality of distributed refractive index lenses G1 and G2 as described above, various designs may be realized, and the same refractive index difference may be maintained while further reducing the thickness compared to the example using a single distributed refractive index lens.

[0084] Figure 3 A process for manufacturing a portion of a lens according to one or more embodiments is shown.

[0085] Reference Figure 3 , a solution of an organic polymer 11 and highly concentrated nano inorganic particles 12 may be applied on a substrate 14. Thereafter, by rotating the substrate 14 together with a heating process, a structure in which the content distribution of the inorganic particles 12 in the organic-inorganic composite material 13 of the refractive index distribution lens G according to the example is continuously set may be obtained.

[0086] Compared to a conventional method of compressing lenses having different refractive indices by pressing or laminating, the refractive index distribution lens G according to the example can have a continuous distribution of the inorganic particles 12. In the example of a structure in which a plurality of lenses are stacked, a phenomenon of lens separation may occur due to insufficient adhesion between the lenses, but in this example, the lenses are manufactured by the above method to form a single layer, so the lens separation problem may not occur.

[0087] In addition, in the example of a structure in which a plurality of lenses are stacked, a gap may be generated between the stacked lenses, thereby possibly reducing transmittance. However, in this example, since the lenses are manufactured by the above method, the problem of the occurrence of the gap can be solved.

[0088] Figure 4 is a perspective view showing a portion of an exemplary lens according to one or more embodiments, and Figure 5 It shows that according to Figure 4 0026] FIG10 is a plan view of the upper surface of an exemplary lens of an example.

[0089] Figure 4 and Figure 5 The arrangement of the inorganic particles 12 in the organic-inorganic composite material 13 constituting the refractive index distribution lens G is shown. However, as shown in the figure, the inorganic particles 12 may be distributed while forming a layer, or the inorganic particles 12 may be distributed without forming a layer. In other words, the boundary may not be divided according to the content of the inorganic particles 12, and the inorganic particles 12 may be irregularly distributed in the organic polymer 11 while having only a tendency to increase or decrease.

[0090] Figure 6 and Figure 7 yes Figure 5 The cross-sectional views II' of FIG. 1 and FIG. 2 respectively show the arrangement of the inorganic particles 12 distributed in the organic polymer 11.

[0091] like Figure 6 As shown, the inorganic particles 12 may be distributed such that the content thereof decreases toward the side surface in the organic polymer 11, and as shown in Figure 7 As shown, the content of the inorganic particles 12 may be distributed such that the content thereof decreases toward the upper portion in the organic polymer 11 .

[0092] Figure 6 and Figure 7 The distribution of the inorganic particles 12 disclosed in is a partial example, and as described above, the inorganic particles 12 may be arranged to increase or decrease in any direction while having a content that continuously changes in the organic polymer 11 according to the example.

[0093] Through the above-described embodiments, the lens module according to the embodiments can prevent the light incident into the lens module from being reflected on the inner surface of the lens barrel to cause a flare phenomenon.

[0094] Hereinafter, the description of the overlapping contents is the same as the above description and thus will be omitted.

[0095] Although the present disclosure includes specific examples, it will be apparent after understanding the disclosure of the present application that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described in this application should be understood only in a descriptive sense, and not for limiting purposes. The description of the features or aspects in each example should be understood to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented by other components or their equivalents, appropriate results can still be achieved. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. Lens module, including: at least one distributed refractive index lens, comprising a first surface and a second surface opposite to the first surface in the optical axis direction; a lens barrel configured to accommodate the at least one distributed index lens; and a housing including the lens barrel, wherein the at least one distributed refractive index lens is composed of a single layer and includes an organic polymer and inorganic particles, and Wherein, the at least one distributed refractive index lens has a refractive index that changes continuously between the first surface and the second surface.

2. The lens module according to claim 1, wherein: The maximum refractive index of the at least one distributed refractive index lens is equal to or greater than 1.

75.

3. The lens module according to claim 2, wherein: A difference between a maximum refractive index and a minimum refractive index of the at least one distributed index lens is equal to or greater than 0.

2.

4. The lens module according to claim 1, wherein: The organic polymer includes at least one of polycarbonate and polymethyl methacrylate.

5. The lens module according to claim 1, wherein: The inorganic particles have a refractive index equal to or greater than 2.

0.

6. The lens module according to claim 5, wherein: The diameter of the inorganic particles is less than or equal to 10 nm.

7. The lens module according to claim 6, wherein: The inorganic particles include one or more of ZrO2, TiO2, ZnS, BaTiO3, Si and WO3.

8. The lens module according to claim 1, wherein: The content distribution of the inorganic particles changes continuously within the at least one distributed refractive index lens.

9. The lens module according to claim 1, wherein: The at least one distributed refractive index lens has a continuously increasing or continuously decreasing refractive index. 10 . The lens module of claim 9 , further comprising one or more lenses configured to be received in the lens barrel.

11. The lens module according to claim 10, wherein: At least one lens of the plurality of lenses includes an organic polymer and inorganic particles.

12. Camera module, including: a lens barrel configured to accommodate at least one distributed refractive index lens, the at least one distributed refractive index lens including a first surface and a second surface opposite to the first surface in the optical axis direction; A housing, comprising the lens barrel; an image sensor module coupled to the housing; and an infrared filter configured to block light in the infrared region from being incident on the image sensor module, wherein the at least one distributed refractive index lens is composed of a single layer and includes an organic polymer and inorganic particles, and Wherein, the at least one distributed refractive index lens has a refractive index that changes continuously between the first surface and the second surface.

13. Electronic equipment, including: Camera module, including: case; at least one single-layer distributed refractive index lens, disposed in the housing and comprising a first surface and a second surface opposite to the first surface in the optical axis direction; at least one lens disposed in the housing; and an image sensor module coupled to the housing, wherein the at least one single-layer distributed refractive index lens comprises an organic polymer and inorganic particles, and Wherein, the at least one single-layer distributed refractive index lens has a refractive index that changes continuously between the first surface and the second surface.

14. The electronic device according to claim 13, wherein: The at least one single-layer distributed refractive index lens is disposed at an object-side surface of the camera module, and the at least one lens is disposed at an image-side surface of the camera module.

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