Patent Publication Number: US-11662543-B2

Title: Multi-group lens, camera module, and electronic device thereof

Description:
FIELD OF THE INVENTION 
     The present invention relates to the field of optical lens and camera module, and further relates to a multi-group lens assembly and a camera module, and an electronic device therefor, and more particularly to a multi-lens lens assembly suitable for a high-pixel camera module. 
     BACKGROUND OF THE INVENTION 
     A lens assembly is an indispensable and extremely important part of a camera module. Performance of the lens assembly itself directly affects imaging quality of the camera module. 
     With continuous development of various smart devices, such as a smart phone, a wearable device or the like, requirements for the camera module and the performance of the camera module itself are constantly increasing. 
     In the development of the camera module, one of the most outstanding performances is that the imaging quality requirements of the camera module are getting higher and higher, for example, the pixel is required to be higher and higher. The imaging quality of the camera module is related to many components, such as the performance of the photosensitive element, the number of lenses of the lens assembly, the process precision that can be achieved during manufacturing, and the design performance of the optical lens, etc. Therefore, the development of the camera module needs to cooperate with development in many aspects. Correspondingly, the development of different components also depends on the development needs of other components. For example, in the early days, when overall performance of the camera module was poor, the pixels of the photosensitive element were lower, and the lens assembly only required two or three pieces of lenses, and in recent years, the factors such as the photosensitive element and the manufacturing process of the camera module or the like are changing with each passing day, and the requirements for the lens assembly are also leaps and bounds. The multi-lens lens assembly has become an unstoppable development direction. 
     A closer look at structure of a traditional lens assembly reveals that the lens assembly usually includes a lens barrel and a lens. The designed and manufactured lenses are sequentially mounted in the lens barrel, thereby forming a lens assembly with a complete optical system, which can be assembled to form a camera module to achieve complete image collection and reproduction. 
     It should be noted here that the optical system is a very sensitive system. In the process of manufacturing, the lens assembly is first theoretical optically designed, then the lenses are manufactured, and then the lenses are sequentially assembled in the lens barrel to form the lens assembly. It can be seen that, between the theoretical optical design and the actual application product, errors are inevitable, especially in the process of lens assembly, there is a certain error for each lens, and after a plurality of lenses are assembled, a whole cumulative error is formed. It is easy to understand that this cumulative error will increase with the increase in the number of the lenses, which is an obvious and difficult problem to solve when the traditional integrated structure lens assembly is exposed to the needs of multi-lens lens assembly. 
     In the traditional integrated lens assembly, the lenses are sequentially fixed in the lens barrel. That is to say, once the lenses are mounted in the lens barrel, the position can hardly be adjusted. On one hand, the mounting process precision is extremely high. On the other hand, the yield of the product is low. 
     Secondly, in modern camera modules and related fields, the demand for camera modules and related components is huge, so the yield in mass production is an important factor in determining whether an ideal design can be practically applied. In the assembly process of the camera module, AA calibration (Active Alignment), that is, to make the optical axes of each component consistent by adjusting in different directions, is an important step in adjusting the optical system. To a certain extent, the AA calibration process affects the yield of the camera module. The traditional lens assembly is mounted on the lens assembly holder or mounted on the motor. During the AA calibration process, the lens assembly can only follow the lens assembly holder or motor movement, and can&#39;t make any adjustments by itself. That is to say, the lens assembly has no effect on AA calibration. In fact, the optical system is mainly composed of a lens assembly and a photosensitive element, and in a camera module composed of a traditional lens assembly, the lens assembly is not directly adjustable. 
     Thirdly, in the design and manufacturing process of the lens assembly, from the ideal optical system to the product made of the actual lenses and the lens barrel, the actual implementation process needs to be considered during the manufacture of the lens assembly, for example, when the actual lens barrel and lenses are manufactured, what standards need to be met in the initial stage, and how to adjust in the latter stage, these are the issues that must be considered to make the lens assembly from theoretical design to actual products, and even more so for multi-lens optical lens assembly in this way. 
     It can be seen from the above that the traditional integrated lens assembly cannot meet the needs of multiple lenses. The development of the lens assembly needs to cross this traditional structural limitation. Further, in the design and production process, it is necessary to explore the design and structure that suits it, so that the theoretical optical design can be put into actual mass production, and has good product yield. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor, wherein the multi-group lens assembly forms an integral lens assembly by at least two group units, thereby breaking through the traditional integrated lens assembly structure, and is suitable for a multi-lens lens assembly. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor, wherein cumulative error of the integral lens assembly is shared by a plurality of group units, and by adjusting spatial range of the plurality of group units during assembling process, the cumulative error of the multi-group lens assembly is reduced. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor, wherein the multi-group lens assembly is particularly suitable for forming a lens assembly of 6, 7 or more pieces of lenses, which is suitable for multi-lens development needs of conventional lens assembly. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor, wherein the multi-group lens assembly is composed of at least two group units, wherein there is a first gap between at least two adjacent group units, so that optical system of actual product meets optical design requirements. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor, wherein the first gap enables the multi-group lens assembly to be AA-calibrated during actual production, and after AA calibration, an expected result is well maintained in subsequent assembling. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor, wherein the first gap cooperates with a pre-design difference between an actual value and a theoretical value of the multi-group unit in actual production, so that optical systems of the actual group unit and the theoretical group unit with difference are consistent. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor wherein there is a second gap between at least two adjacent group lens assemblies, so that the multi-group lens assembly can be stably assembled in actual production. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor, wherein the first gap and the second gap communicate with each other, so that a connection medium can be adjusted in the space of the first gap and the second gap to facilitate stable assembling. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor, wherein the providing of the first gap and the second gap enables the multi-group lens assembly to transform from a theoretical design to an actual product, and achieves the expected optical system design through a stable assembly process, which improves the product yield, and suitable for practical mass production applications. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and electronic device therefor, wherein the size of the first gap is determined by the result of the AA calibration, and the group unit is brought closer to the first gap of a predetermined value during assembly, so that a relative determined position of the group unit finally meets the design requirements of the optical system. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor, wherein the second gap is larger than the first gap, so that the connection medium can be moved from a position corresponding to the first gap to a position corresponding to the second gap during assembling, thereby alleviating an interaction force between the group units, so that the assembly process is more stable, and the mutual influence between the group units is small. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and electronic device therefor, wherein the connection medium has elasticity to buffer the interaction force of assembly between the group units. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor, wherein at least one adjusting element is provided between at least two adjacent group units, so that the first gap and the second gap are formed between the two group units. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and electronic device therefor, wherein the adjusting element is selectively integrally provided in the group unit. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor, wherein in some embodiments, the adjusting element is integrally provided on the group unit located above, and is protruded from an extension platform of the group unit at intervals. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor, wherein in some embodiments, the adjusting element is integrally provided on the group unit located below, is protruded from an upper surface of the group unit at intervals. 
     An object of the present invention is to provide a multi-group lens assembly and a camera module, and an electronic device therefor, wherein a plurality of adjusting elements are provided between at least two adjacent group units, and each of the adjusting elements is symmetrically arranged, so that the force between the two group units is uniform. 
     In order to achieve the above at least one object of the present invention, an aspect of the present invention is to provide a multi-group lens assembly including: 
     at least two group units; at least one first gap between at least two adjacent group units to compensate for difference between the multi-group lens assembly and an optical design system, so that an optical system of the multi-group lens assembly conforms to the optical design system. 
     In the multi-group lens assembly according to some embodiments, the multi-group lens assembly includes two group units, which are a first group unit and a second group unit, respectively, wherein the first group unit includes a first bearing component and at least one first group lens, the first group lens is mounted in the first bearing component, and the second group unit includes a second bearing component and at least one second group lens, the second group lens is mounted in the second bearing component, so as to form two units of lens assembly separately. 
     In the multi-group lens assembly according to some embodiments, the first bearing component forms the first gap with the second bearing component, and a connection medium is provided in the first gap. 
     In the multi-group lens assembly according to some embodiments, the first bearing component includes a first main body and an extension platform, the extension platform forms the first gap with the second bearing component of the second group unit. 
     In the multi-group lens assembly according to some embodiments, the extension platform forms a ring structure. 
     In the multi-group lens assembly according to some embodiments, wherein the first main body has a first accommodating cavity, a first upper light passing hole and a first lower light passing hole, the first group lens is accommodated in the first accommodating cavity, the light passes through the first upper light passing hole to arrive at the first group lens, and passes through the first lower light passing hole to arrive at the second group unit. 
     In the multi-group lens assembly according to some embodiments, the second main body has a second accommodating cavity, a second upper light passing hole and a second lower light passing hole, the second group lens is accommodated in the second accommodating cavity, the light passing through the first group unit passes through the second upper light passing hole to arrive at the second group lens in the second group unit, and passes out of the second group unit through the lower light passing hole. 
     In the multi-group lens assembly according to some embodiments, the first main body below the extension platform extends into the second upper light passing hole of the second main body. 
     In the multi-group lens assembly according to some embodiments, the second bearing component includes an inner extension edge, the inner extension edge extends inwardly from the second main body to form the second upper light passing hole. 
     In the multi-group lens assembly according to some embodiments, the first main body forms a fourth gap with the inner extension edge, so that relative positions of the first group unit and the second group unit are adjusted. 
     In the multi-group lens assembly according to some embodiments, the extension platform forms the first gap with the inner extension edge. 
     In the multi-group lens assembly according to some embodiments, the multi-group lens assembly includes at least one adjusting element, the adjusting element is provided on the extension platform of the first group unit, and the adjusting element forms the first gap with the inner extension edge. 
     In the multi-group lens assembly according to some embodiments, at least two adjacent group units have at least one second gap, and the second gap communicates with the first gap. 
     In the multi-group lens assembly according to some embodiments, the adjusting element partially extends downwardly from the extension platform to form the first gap and second gap between the extension platform and the inner extension edge. 
     In the multi-group lens assembly according to some embodiments, wherein the extension platform of the first group unit forms the second gap with the inner extension edge of the second group unit. 
     In the multi-group lens assembly according to some embodiments, the multi-group lens assembly includes at least one adjusting element, the adjusting element is provided on the inner extension edge of the second bearing component, and the inner extension edge forms the first gap with the extension platform. 
     In the multi-group lens assembly according to some embodiments, the second bearing component includes an outer convex wall, the outer convex wall extends upwardly from the second main body to form an inner mounting groove, and the extension platform is accommodated in the inner mounting groove. 
     In the multi-group lens assembly according to some embodiments, the outer convex wall forms a third gap with the outer extension platform. 
     In the multi-group lens assembly according to some embodiments, the second bearing component includes an inner convex wall, and the inner convex wall extends upwardly from the second main body to form an outer mounting groove. 
     In the multi-group lens assembly according to some embodiments, the adjusting element partially extends downwardly from the exterior of the extension platform to form a U-shaped structure with the first main body. 
     In the multi-group lens assembly according to some embodiments, the adjusting element extends from the outer mounting groove. 
     In the multi-group lens assembly according to some embodiments, a connection medium is provided in the first gap, so as to fix the first group unit and the second group unit. 
     In the multi-group lens assembly according to some embodiments, the connection medium is one or more selected from the group consisting of UV glue, thermosetting glue, UV thermosetting glue, and epoxy glue. 
     In the multi-group lens assembly according to some embodiments, a connection medium is provided in the first gap and the second gap, so as to fix the first group unit and the second group unit. 
     In the multi-group lens assembly according to some embodiments, a connection medium is provided in the third gap, so as to fix the first group unit and the second group unit. 
     In the multi-group lens assembly according to some embodiments, the adjusting element is symmetrically arranged at intervals. 
     In the multi-group lens assembly according to some embodiments, the number of adjusting elements is one selected from 2, 3, 4, 5, 6, 7 and 8. 
     In the multi-group lens assembly according to some embodiments, the number of lenses of the multi-group lens assembly is 7. 
     In the multi-group lens assembly according to some embodiments, the number of the lenses of the first group unit is 4, and the number of the lenses of the second group unit is 3. 
     In the multi-group lens assembly according to some embodiments, the number of lenses of the first group unit and the second group unit is a combination selected from (4, 3), (3, 4), (6, 1), (1, 6), (5, 2), and (2, 5). 
     In the multi-group lens assembly according to some embodiments, the first group unit includes at least one first optical path element, which is arranged in cooperation with the lens to form a light path of the first group unit. 
     In the multi-group lens assembly according to some embodiments, the optical path element and the first group lens are alternately provided. 
     In the multi-group lens assembly according to some embodiments, the second group unit includes a second optical path element, which is arranged in cooperation with the second group lens to form a light path of the second group unit. 
     In the multi-group lens assembly according to some embodiments, the first bearing component has at least one reinforcing fixing groove corresponding to a position of the first group lens located at a bottom end of the first group unit, for accommodating a bonding medium to reinforce and fix the first group lens. 
     In the multi-group lens assembly according to some embodiments, the second bearing component has at least one reinforcing fixing groove corresponding to a position of the second group lens located at a bottom end of the second group unit, for accommodating a bonding medium to reinforce and fix the second group lens. 
     In the multi-group lens assembly according to some embodiments, the first group unit and the second group unit are assembled by active calibration. 
     Another aspect of the present invention is to provide a camera module including: a multi-group lens assembly; and a photosensitive component; wherein the multi-group lens assembly is located in a photosensitive path of the photosensitive component; 
     wherein the multi-group lens assembly includes at least two group units; at least one first gap is between at least two adjacent group units to compensate for a difference between the multi-group lens assembly and an optical design system, so that an optical system of the multi-group lens assembly conforms to the optical design system. 
     Another aspect of the present invention is to provide an electronic device including: a device main body; and a camera module, wherein the camera module cooperates with the device main body to implement image collection and reproduction. 
     In the electronic device according to some embodiments, the electronic device is one selected from the group consisting of a smart phone, a wearable device, a computer device, a television, a vehicle, a camera and a monitoring device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a block diagram of manufacturing principle of a multi-group lens assembly according to embodiments of the present invention. 
         FIG.  2    is an overall perspective view of a multi-group lens assembly according to a first embodiment of the present invention. 
         FIG.  3    is an overall cross-sectional view of the multi-group lens assembly according to the first embodiment of the present invention. 
         FIG.  4 A  is a partial enlarged view of a part of the multi-group lens assembly according to the first embodiment of the present invention, for illustrating a first gap and a third gap. 
         FIG.  4 B  is a partial enlarged view of a part of the multi-group lens assembly according to the first embodiment of the present invention, for illustrating a second gap and the third gap. 
         FIG.  5    is a perspective view of the first group unit of the multi-group lens assembly in an erected state according to the first embodiment of the present invention. 
         FIG.  6    is a perspective view of the first group unit of the multi-group lens assembly in an inverted state according to the first embodiment of the present invention. 
         FIG.  7    is a perspective view of a second group unit of a multi-group lens assembly in an erected state according to the first embodiment of the present invention. 
         FIG.  8    is a perspective view of the second group unit of the multi-group lens assembly in an inverted state according to the first embodiment of the present invention. 
         FIG.  9    is a schematic view of the assembly process of the first group unit according to the first embodiment of the present invention. 
         FIG.  10    is a schematic view of the assembly process of the second group unit according to the first embodiment of the present invention. 
         FIGS.  11 A to  11 C  are schematic views of different fixing manners of two group units according to the first embodiment of the invention. 
         FIG.  12    is a schematic view of a camera module constructed by the multi-group lens assembly according to the first embodiment of the present invention. 
         FIG.  13    is a schematic view of an assembly process of the camera module constructed by the multi-group lens assembly according to the above embodiment of the present invention. 
         FIG.  14    is a schematic view of another assembly process of the camera module constructed by the multi-group lens assembly according to the above embodiment of the present invention. 
         FIG.  15    is a schematic view of variations in positions of the gap between the multi-group lens assemblies in the above-described adjustment process according to the present invention. 
         FIG.  16    is a cross-sectional view of a multi-group lens assembly according to a second embodiment of the present invention. 
         FIG.  17 A  is a partial enlarged schematic view of a part of the multi-group lens assembly according to the second embodiment of the present invention, for illustrating a first gap and a third gap. 
         FIG.  17 B  is a partial enlarged schematic view of a part of the multi-group lens assembly according to the second embodiment of the present invention, for illustrating a second gap and the third gap. 
         FIG.  18    is a cross-sectional view of a multi-group lens assembly according to a third embodiment of the present invention. 
         FIG.  19    is a partial enlarged schematic view of the multi-group lens assembly according to the third embodiment of the present invention, for illustrating a first gap. 
         FIG.  20    is a cross-sectional view of a multi-group lens assembly according to a fourth embodiment of the present invention. 
         FIGS.  21 A to  21 E  are block diagrams of different lens arrangement manner of the multi-group lens assembly according to the above-described embodiments of the present invention. 
         FIG.  22    is a schematic view of an application of a camera module constructed by the multi-group lens assembly according to the above embodiments of the present invention. 
     
    
    
     DETAIL DESCRIPTION OF THE INVENTION 
     The following description is presented to disclose the present invention to enable those skilled in the art to practice the present invention. The preferred embodiments in the following description are by way of embodiment only, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention as defined in the following description may be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions without departing from the spirit and scope of the present invention. 
     It should be understood by those skilled in the art that in the disclosure of the present invention, The orientation or positional relationship indicated by the terms “longitudinal”, “transverse”, “upper”, “lower”, “front”, “back”, “left”, “right”, “upright”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, thus the above terms should not be construed as limiting the invention. 
     It will be understood that the term “a” is understood to mean “at least one” or “one or more”, that is, in one embodiment, the number of one element may be one, and in other embodiments, the number of the element can be multiple, and the term “a” cannot be construed as limiting the quantity. 
     With a continuous development of smart devices, requirements for camera modules are getting higher and higher, and the corresponding lens assembly with multiple lenses has become an important trend in the development of an optical lens assembly. After designing optical systems with various performances in line with the expected range, the physical components and the corresponding manufacturing process are required to realize the theoretical design, which is indispensable for the actual manufacturing industry, and the actual production also in turn guides and corrects the theoretical design. 
     In general, the production of an optical lens assembly requires several important steps, such as the optical design process, the actual hardware design, and the actual production assembly process. Referring to  FIG.  1   , which is a schematic diagram of the design implementation process of the present invention, it takes a multi-group lens assembly provided by the present invention as an embodiment. Firstly, an optical design process is required to obtain optical system design parameters, which meet the expected requirements, such as meet expected imaging quality requirements. Learned in the design process, as the problem described in the background, the original lens assembly with fewer lenses cannot meet the design requirements, and then the optical system composed of a larger number of lenses is designed, and each lens parameter needs to meet the predetermined condition, such as designing an optical system composed of 6 pieces, 7 pieces and more pieces of lenses. However, for an integrated lens assembly of a traditional structure, due to structural limitations and limitations of the assembly manufacturing process, when multiple lenses, such as 6 pieces, 7 or more pieces are used, the imaging quality and the precision of the manufacturing process or the like cannot meet the design requirements of the optical system, and it is difficult to overcome. Therefore, the present invention breaks through the traditional integrated lens assembly structure in actual hardware design, to form an integrated lens assembly by at least two group units together, and relative positions of each group unit can be adjusted in space, for example, in a six-axis space, so that the overall cumulative error of the multi-group lens assembly is small, and the overall number of lenses is large, for example, it is easy to reach the design requirements of 6, 7 or more pieces. And further, the multi-group lens assembly provides a mating structure between the group units, so that the group units are stably combined, the optical paths are consistent, and stray light is prevent from entering into the interior from the jointing position of two groups units. And further, in the implementation component of the optical system, it is necessary to consider the limitation of the assembly process, the actual production situation, and in order to facilitate the later assembly adjustment, there is a predetermined difference between the actual production parameter value and the optical design parameter value of the group unit, and the two are not exactly the same, to provide the possibility of subsequent assembly adjustment. Further, when the multi-group lens assembly constitutes the camera module, a AA calibration is an important step to ensure a high imaging quality, and the multi-group lens assembly of the present invention is further provided with at least one first gap, which is provided between at least two adjacent group units, so as to compensate the inconsistency in optical imaging quality caused by the difference between the design parameter value and the actual production value through the first gap to cooperate with AA calibration process, thereby the imaging quality requirements of the actual product of the group unit meet the expected optical imaging quality requirements. Further, a multi-group unit needs to form an integrated lens assembly, which needs to be stably fixed, and the result after fixing needs to be consistent with that before fixing, so that the image quality is guaranteed, which is one of the important factors for ensuring the yield of the lens assembly or camera module product. Further, the multi-group unit of the present invention provides a connection medium, such as glue, provided in the first gap, so that the multi-group unit can be stably fixed. Further, the present invention provides a second gap, which is communicated with the first gap, so that the connection medium can move between the first gap and the second gap, so that the interaction force of each of the group units is small, and it is easier to obtain an expected mounting requirement, so that the image quality is guaranteed. Further, in some embodiments of the invention, the first gap and the second gap are formed, for example, it is integrally provided in the group unit by providing at least one adjusting element between the group units, so that the multi-lens optical system of the optical system design that meets the predetermined requirements is realized by the multi-group lens assembly of the present invention, and is applied to the actual production process, and can have good yield, especially suitable for product realization of multi-lens optical system, such as an optical system with 6, 7 or more pieces of lenses. 
     Of course, the present invention also proposes other improvements and brings many other advantages, and will not be enumerated here, and some embodiments will be described in detail by way of example to facilitate understanding of the present invention, but it should be understood by those skilled in the art that the specific structures in the following embodiments are merely illustrative and are not limitations of the inventive concept of the present invention. 
     For convenience of description and understanding, the following is an example of a multi-group lens assembly composed of two group units, and in other embodiments of the present invention, the multi-group lens assembly may include more group units, such as three, four or more, each of the group unit may be combined by the concept of the present invention, or may be combined by combining the concept of the present invention with other ways, and it should be understood by those skilled in the art that the number of group units is not a limitation of the present invention, and the scope of the present invention in combination with a multi-group lens assembly is not a limitation of the present invention. 
     As shown in  FIGS.  2  to  11 C , which is a multi-group lens assembly  10  according to a first embodiment of the present invention, the present invention provides a multi-group lens assembly  10  which is suitable for a multi-lens lens assembly, for example, with 6, 7 or more pieces of lenses. That is to say, the multi-group lens assembly  10  includes a plurality of lenses, such as 6, 7 or more pieces of lenses. 
     The multi-group lens assembly  10  is adapted to be assembled to form a camera module  100 , and is particularly adapted to be assembled to form a camera module  100  with high pixels. 
     The multi-group lens assembly  10  includes at least two group units, each of which forms an integral optical system of the multi-group lens assembly  10  together. That is to say, the optical system of multi-lens is realized by a combination of at least two group units, instead of being implemented by a single lens assembly as a conventional integrated lens assembly. 
     It is worth mentioning that the lenses in each group unit of the multi-group lens assembly  10  can be allocated and combined according to different needs, such as various different distribution modes as illustrated in  FIGS.  21 A to  21 E . In this embodiment of the present invention, only one of them is selected for description, and it should be understood by those skilled in the art that the number of lenses and the manner of distribution thereof are not limited by the present invention. 
     Further, there is a first gap  15  between at least two adjacent group units, and the first gap  15  compensates for a difference between the multi-group lens assembly  10  and the optical design system, so that the optical system of the multi-group lens assembly  10  conforms to the optical design system. 
     More specifically, the multi-group lens assembly  10  includes two group units, which are a first group unit  11  and a second group unit  12 , respectively. When the first group unit  11  and the second group unit  12  constitute an integral lens assembly, the first group unit  11  is located above the second group unit  12 , and the optical axis of the first group unit  11  and the second group unit  12  are consistent. That is to say, in this embodiment of the present invention, the optical system of the multi-group lens assembly  10  is composed of two optical systems corresponding to the first group unit  11  and the second group unit  12 , respectively. That is to say, to a certain extent, when the first group unit  11  and the second group unit  12  are each independently present, the function of one integral lens assembly cannot be implemented, and when the first group unit  11  and the second group units  12  cooperate with each other, they constitute a integral lens assembly that can meet the imaging quality requirements. 
     Further, the first group unit  11  includes a first bearing component  111  and at least one first group lens  112 , and the first group lens  112  is mounted in the first bearing component  111 , so as to form an independent component. The second group unit  12  includes a second bearing component  121  and at least one second group lens  122 . The second group lens  122  is mounted in the second bearing component  121 , so as to form another independent component. 
     The first bearing component  111  is provided above the second bearing component  121 , so that the optical paths of the first group unit  11  and the second group unit  12  are consistent. 
     There is a first gap  15  between the first group unit  11  and the second group unit  12 , and the first gap  15  is used to compensate for the design difference between the multi-group lens assembly  10  and the optical design system, so that the imaging quality requirements of the actual optical system of the multi-group lens assembly  10  composed of the first group unit  11  and the second group unit  12  is consistent with that of the designed optical system. 
     More specifically, the first gap  15  is located between the first bearing component  111  and the second bearing component  121 , so as to facilitate adjustment of the first bearing component  111  and the second bearing component  121 . 
     The multi-group lens assembly  10  includes a connection medium  14  provided in the first gap  15 , so that the first group unit  11  and the second group unit  12  are stably fixed. The connection medium  14  is exemplified by, but not limited to, one or more selected from the group consisting of UV glue, thermosetting glue, UV thermosetting glue, and epoxy glue. 
     The multi-group lens assembly  10  has a second gap  16  that communicates with the first gap  15 , so that the connection medium  14  can be moved from a position corresponding the first gap  15  to a position corresponding to the second gap  16  during manufacturing, thereby reducing the interaction force between the first group unit  11  and the second group unit  12 , and reducing the influence on the relative position. 
     More specifically, the second gap  16  is located between the first bearing component  111  and the second bearing component  121 . 
     A height of the first gap  15  is greater than a height of the second gap  16 , so that the connection medium  14  is moved from the position corresponding to the first gap  15  to the position corresponding to the second gap  16  during manufacturing, and a larger accommodating space is provided. 
     When the first group unit  11  and the second group unit  12  are assembled, the connection medium  14  is provided below the first bearing component  111  and/or above the second bearing component  121 , the first group unit  11  and the second group unit  12  are then assembled at predetermined positions, so that their relative positions reach a predetermined position. In the process of bonding, the connection medium  14  is under the interaction force of the first group unit  11  and the second group unit  12 , such as under the action of pressing, moves from a position corresponding to the first gap  15  to a position corresponding to the second gap  16 . Since the height of the second gap  16  is greater than that of the first gap  15 , an accommodating space of the connection medium  14  is expanded, so that the original interaction force at the position corresponding to the first gap  15  is alleviated. 
     It is worth mentioning that, during assembly, sizes of the first gap  15  and the second gap  16  are determined by requirements for the camera module  100  composed of the multi-group lens assembly  10  composed of the first group unit  11  and the second group unit  12 . That is to say, at the time of assembly, the size of the gap is determined according to the focus result of the camera module  100 , and the relative positions of the first group unit  11  and the second group unit  12  are adjusted, so that the first gap  15  meets predetermined requirement. 
     It is also worth mentioning that in the traditional integrated lens assembly, the lenses are successively mounted in the lens barrel, a range in which the lens can be adjusted is small, and once the lens is fixed, the relative position of the lens and the lens barrel is fixed. When all of the lenses are assembled, the cumulative error of the entire lens assembly is determined, and cannot be adjusted. In the present invention, the first group unit  11  and the second group unit  12  are each independently constituted without affecting each other, and when the first group unit  11  and the second group unit  12  are assembled into an integral lens assembly, the first group unit  11  and the second group unit  12  can be relatively adjusted, so that the lens assembly can be further calibrated to reduce the overall error, in particular, it is possible to perform adjustment of different directions of the three-dimensional space, such as the six-axis direction adjustment. 
     The multi-group lens assembly  10  includes at least one adjusting element  13 , the adjusting element  13  is located between the first group unit  11  and the second group unit  12 , so as to form the first gap  15  and the second gap  16 . And the mutual influence of the first group unit  11  and the second group unit  12  in the process of combining with each other is reduced by the adjusting element  13 . That is to say, when the first group unit  11  and the second group unit  12  are fixedly connected by the connection medium  14 , the connection medium  14  is contacted by the adjusting element  13  instead of an entire flat bottom surface of the first group unit  11 , so that comparing to the first group unit  11  without the adjusting element  13 , the initial contact area between the first group unit  11  with the adjusting element  13  and the connection medium  14  is small, so that the interaction force when the first group unit  11  and/or the second group unit  12  are relatively adjusted is small, for example, during relative rotation or movement, the mutual pulling force brought by the viscous connection medium  14  is small, so that the adjustment of one of the group units has less influence on the other group unit, so that when the multi-group lens assembly  10  is calibrated by AA, the calibration standard is easily reached, and the calibration result is more accurate. 
     The first bearing component  111  includes a first main body  1111  and an outer extension platform  1112 . The outer extension platform  1112  extends outwardly from the first main body  1111 . In particular, the outer extension platform  1112  extends integrally horizontally outward from the first main body  1111 , so that an annular brim structure is formed, for example, formed in an integrated manner by a die. 
     The outer extension platform  1112  can be provided at positions with different heights outside the first main body  1111 , such as at positions with different heights of a bottom portion, a lower portion, near the lower portion, an upper portion, near the upper portion, and a middle portion. In this embodiment of the present invention, the outer extension platform  1112  is provided at a middle position outside the first main body  1111 , and the first main body  1111  is divided into two parts, a part located above the outer extension platform  1112  and a part located below the outer extension platform  1112 . After the first group unit  11  and the second group unit  12  are assembled, a part of the first main body  1111  located above the outer extension platform  1112  is in an external space, and a part of the first main body  1111  located below the outer extension platform  1112  extends into the second group unit  12 . 
     The outer extensions platform  1112  can be set with different heights, for example, in some embodiments, a relatively small height is set, so that the top surface  11121  of the outer extension platform is lower than the top end of the first main body  1111 . For example, in some embodiments, a relatively large height is set, so that the top surface  11121  of the outer extension platform is consistent with the top end of the first main body  1111 , so that the upper portion of the multi-group lens assembly  10  has a different shape. 
     In this embodiment of the invention, the first main body  1111  and the outer extension platform  1112  can be manufactured in an integrated manner by a die. In other embodiments, the outer extension platform  1112  can be connected to the first main body  1111  by adhering. Of course, in other embodiments, the first main body  1111  and the outer extension platform  1112  may also be formed by other manners. It should be understood by those skilled in the art that the position and height of the outer extension platform  1112  and the manner in which the first main body  1111  and the outer extension platform  1112  are fixed are not limitations of the present invention. 
     Further, in this embodiment of the present invention, the first group lens  112  of the first group unit  11  includes four lenses, which are a first lens  1121 , a second lens  1122 , a third lens  1123  and a fourth lens  1124 . The first lens  1121 , the second lens  1122 , the third lens  1123 , and the fourth lens  1124  are sequentially arranged from top to bottom. In this embodiment and the accompanying drawings of the present invention, the first group unit  11  composed of four lenses is illustrated and described as an example. In other embodiments of the present invention, the number of lenses of the first group unit  11  may also be other numbers, such as 2, 3, 4, 5 or more pieces. It will be understood by those skilled in the art that the number of lenses of the first group unit  11  is not a limitation of the present invention. 
     The first main body  1111  has a first accommodating cavity  11111 , a first upper light passing hole  11112  and a first lower light passing hole  11113 . The first lens  1121 , the second lens  1122 , the third lens  1123 , and the fourth lens  1124  are sequentially accommodated in the first accommodating cavity  11111  from top to bottom. 
     The first upper light passing hole  11112  is located at an upper portion of the first main body  1111  for communicating with the outside, so that light enters the first group unit  11 , that is, the external light is made to arrive at the first lens  1121 , the second lens  1122 , the third lens  1123 , and the fourth lens  1124  in the first accommodating cavity  11111 . 
     The first lower light passing hole  11113  is located at a lower portion of the first main body  1111  and communicates with the second group unit  12 , so that light passing through the first group unit  11  arrives at the second group unit  12 . 
     In other words, in this embodiment, the first lens  1121  is adjacent to the first upper light passing hole  11112 , and the fourth lens  1124  is adjacent to the first lower light passing hole  11113 . 
     Further, in this embodiment of the invention, the second group lens  122  of the second group unit  12  includes three lenses, which are a fifth lens  1221 , a sixth lens  1222  and a seventh lens  1223 , respectively. The fifth lens  1221 , the sixth lens  1222 , and the seventh lens  1223  are sequentially arranged from top to bottom. In this embodiment and the accompanying drawings of the present invention, the second group unit  12  composed of three lenses is illustrated and described as an example. In other embodiments of the present invention, the number of lenses of the second group unit  12  may also be other numbers, such as 2, 3, 4, 5 or more pieces. It will be understood by those skilled in the art that the number of lenses of the second group unit  12  is not a limitation of the present invention. 
     The second main body  1211  has a second accommodating cavity  12111 , a second upper light passing hole  12112  and a second lower light passing hole  12113 . The fifth lens  1221 , the sixth lens  1222 , and the seventh lens  1223  are sequentially accommodated in the second accommodating cavity  12111  from top to bottom. 
     The second upper light passing hole  12112  is located at an upper portion of the second main body  1211  for communicating with the first group unit  11 , so that the light passing through the first group unit  11  arrives at the second group unit  12 , that is, the light arrives at the fifth lens  1221 , the sixth lens  1222  and the seventh lens  1223  located in the second accommodating cavity  12111 . 
     The second lower light passing hole  12113  is located at a lower portion of the second main body  1211  and communicates with the outside, so that the light passing through the second group unit  12  arrives at the outside, for example, arrives at the photosensitive element  22  of the camera module  100 , thereby the first group unit  11  and the second group unit  12  form a integral optical system. 
     That is to say, in this embodiment of the present invention, the first lens  1121 , the second lens  1122 , the third lens  1123 , and the fourth lens  1124  of the first group unit  11  constitutes an integrated optical system composed of 7 lenses with the fifth lens  1221 , the sixth lens  1222  and the seventh lens  1223  of the second group unit  12 , and functions as an integral lens assembly. 
     In this embodiment of the present invention, the first group unit  11  includes at least one first optical path element  113 , the first optical path element  113  is provided adjacent to the lens, so as to form a predetermined light path on the lens. For example, the first optical path element  113  can be a space ring that blocks the light of the edge of the lens and forms a predetermined light path at center of the lens. The first optical path element  113  can be a coating that optically covers the edge of the lens to form a predetermined light path at the center of the lens. In other words, The first optical path element  113  is provided in cooperation with the lens, so as to form a predetermined light path in the lens. 
     More specifically, in this embodiment of the invention, the first group unit  11  includes three of the first optical path elements  113  provided between two adjacent lenses, respectively, for example, provided between the first lens  1121  and the second lens  1122 , between the second lens  1122  and the third lens  1123 , and between the third lens  1123  and the fourth lens  1124 , respectively. 
     The second group unit  12  includes at least one second optical path element  123 , the second optical path element  123  is provided at a position adjacent to the lens, so as to form a predetermined light path on the lens. For example, the second optical path element  123  can be a space ring that blocks light at the edge of the lens and forms a predetermined light path at the center of the lens assembly. The second optical path element  123  can be a coating that optically covers the edge of the lens to form a predetermined light path at the center of the lens. 
     More specifically, in this embodiment of the invention, the second group unit  12  includes three of the second optical path elements  123  provided between two adjacent lenses, respectively, for example, provided at the top of the fourth lens  1124 , between the fourth lens  1124  and the fifth lens  1221 , between the fifth lens  1221  and the sixth lens  1222 , and between the sixth lens  1222  and the seventh lens  1223 , respectively. In particular, the optical path element between the third lens  1123  and the fourth lens  1124  is provided on a top surface of the fourth lens  1124 , so that the external light is blocked from the first group and the second group bonding position to arrive at the lens of the multi-group lens assembly  10 . The second optical path element  123  can be a space ring, an opaque coating, such as a black glue layer, etc., it will be understood by those skilled in the art that the type of the second optical path element  123  is not a limitation of the present invention. 
     Further, the second bearing component  121  includes an inner extension edge  1212  extending inwardly from the second main body  1211  to form the second upper light passing hole  12112 . In particular, the inner extension edge  1212  is formed integrally by extending inwardly from the second main body  1211 , such as formed in an integrated manner by a die. 
     According to this embodiment of the invention, the first main body  1111  of the first bearing component  111  of the first group unit  11  extends into the second upper light passing hole  12112 , the outer extension platform  1112  of the first bearing component  111  of the first group unit  11  is continued from the inner extension edge  1212  of the second bearing component  121  of the second group unit  12 , so that the first group unit  11  and the second group unit  12  form a mating structure. 
     Further, the first gap  15  and the second gap  16  are provided between the outer extension platform  1112  of the first bearing component  111  of the first group unit  11  and the inner extension edge  1212  of the second bearing component  121  of the second group unit  12 . 
     More specifically, the adjusting element  13  is provided below the outer extension platform  1112 , located between the outer extension platform  1112  of the first bearing component  111  and the inner extension edge  1212  of the second bearing component  121 . More specifically, in this embodiment of the invention, the adjusting element  13  extends integrally downwardly from the outer extension platform  1112 , so that the first gap  15  is formed between the bottom surface  131  of the adjusting element and the top surfaces  12121  of the inner extension edge of the second bearing component, and the second gap  16  is formed between a bottom surface  11122  of the outer extension platform of the first bearing component  111  and a top surface  12121  of the inner extension edge of the second bearing component  121 . 
     In another embodiment of the present invention, the adjusting member  13  may be provided under the outer extension platform  1112  by adhering, that is to say, not be provided on the outer extension platform  1112  by an integrated molding manner. 
     The first main body  1111 , the outer extension platform  1112 , and the adjusting element  13  may be connected to each other in an integrated molding manner by a die, or may be connected in a fixed manner by an adhering medium. The constituent materials of the first main body  1111 , the outer extension platform  1112 , and the adjusting element  13  may be the same, for example, they are all made of plastic, or they may be different materials. It should be understood by those skilled in the art that the present invention is not limited in these aspects. 
     In other embodiments, the adjusting element  13  may be provided on the second group unit  12 , for example, the adjusting element  13  is provided on the top surface  12121  of the inner extension edge of the second group unit  12 , so that a space between the outer extension platform  1112  of the first group unit  11  and the inner extension edge  1212  of the second group unit  12  is partitioned into a plurality of the first gap  15  and a plurality of the second gaps  16 . For example, the bottom surface  131  of the adjusting element forms the first gap  15  with the bottom surface  11122  of the outer extension platform of the first group unit  11 , the second gap  16  is formed between the bottom surface  11122  of the outer extension platform of the first group unit  11  and the top surface  12121  of the inner extension edge of the second group unit  12 . Further, in this manner, the connection medium  14  may be provided in the first gap  15  and the second gap  16 , so that the first group unit  11  and the second group unit  12  are connected stably. It will be understood by those skilled in the art that the location of the adjusting element  13  is not a limitation of the invention. 
     Further, the multi-group lens assembly  10  includes a plurality of the adjusting elements  13  symmetrically arranged under the outer extension platform  1112 , so that when the first group unit  11  and the second group unit  12  are combined, the interaction force is uniform. A plurality of the adjusting elements  13  separate a space between the outer extension platform  1112  and the inner extension edge  1212  of the second group unit  12  into a plurality of the first gaps  15  and a plurality of the second gaps  16 . 
     More specifically, in this embodiment of the present invention, the multi-group lens assembly  10  includes a plurality of the adjusting elements  13 , for example, 2, 3, 4, or more. Each of the adjusting elements  13  is symmetrically provided below the outer extension platform  1112 . Each of the adjusting elements  13  is spaced apart below the outer extension platform  1112 , and the space between the outer extension platform  1112  of the first group unit  11  and the inner extension edge  1212  of the second group unit  12  is partitioned into four of the first gaps  15  and four of the second gaps  16 . 
     The second bearing component  121  includes an outer convex wall  1213 , the outer convex wall  1213  extends upwardly from the outside of the second main body  1211  and forms an inner mounting groove  1214  with the inner extension edge  1212 . The outer extension platform  1112  of the first group unit  11  is accommodated in the inner mounting groove  1214 . 
     In this embodiment of the present invention, the outer convex wall  1213  is an annular wall, and correspondingly, the inner mounting groove  1214  is an annular groove. The annular outer convex wall  1213  is provided to form an accommodating space of the connection medium  14 , so that the first group unit  11  and the second group unit  12  can be connected and fixed in a vertical direction, the connection is more stable, and the connection medium  14  does not flow to outside. 
     In other embodiments of the present invention, the outer convex wall  1213  may be other structures, such as spaced convex structures, it will be understood by those skilled in the art that the structure of the outer convex wall  1213  is not a limitation of the present invention. Of course, in other embodiments, the outer convex wall  1213  may not be provided, referring to  FIG.  20   , in the fourth embodiment of the present invention, the second bearing component  121  does not include the outer convex wall  1213 , that is to say, the top surface of the second group unit  12  is flat and is a flat extending plane. 
     There is a third gap  17  between the outer convex wall  1213  and the outer extension platform  1112  of the first bearing component  111  of the first group unit  11  to facilitate the assembly of the first group unit  11  and the second group unit  12 . 
     For example, in some embodiments, the connection medium  14  is provided in the third gap  17 , so that the connection of the first group unit  11  and the second group unit  12  is more stable. In some embodiments, the connection medium  14  is a UV glue, and the third gap  17  is in communication with the outside to provide a larger exposure area for the connection medium  14 , so that the connection medium  14  reaches stable performance more quickly. 
     It is worth mentioning that, in the present invention, the outer extension platform  1112  divides the first main body  1111  into two parts, a main body upper portion  11115  and a main body lower portion  11116 , respectively. The main body upper portion  11115  is located above the outer extension platform  1112 , and the main body lower portion  11116  is located below the outer extension platform  1112 . When the first group unit  11  is combined with the second group unit  12 , the main body lower portion  11116  extends into the second upper light passing hole  12112  of the first group unit  11 , an outer extension platform  1112  extends over the second group unit  12  and the inner extension edge  1212 . For example, the outer extension platform  1112  is supported on the inner extension edge  1212  of the second group unit  12 , and the outer extension platform  1112  is accommodated in the outer convex wall  1213  and the inner extension edge  1212  of the second main body  1211  unit to form the inner mounting groove  1214 . Thereby, a mating structure is formed between the first group unit  11  and the second group unit  12 , so that the first group unit  11  and the second group unit  12  are stably and cooperatively assembled to form an integral lens assembly. 
     The mating structure of the first group unit  11  and the second group unit  12  brings many advantages, for example, the main body lower portion  11116  of the first main body  1111  extends into the second upper light passing hole  12112 , the second upper light passing hole  12112  limits the position of the first main body  1111 , so that the first group unit  11  and the second group unit  12  are easier to assemble accurately. The first main body  1111  extends into the second group unit  12 , so that the distance between the lens in the first group unit  11  and the lens in the second group unit  12  is reduced, thereby reducing the total optical length. The first main body  1111  extends into a gap between the lens at the most bottom part of the first group unit  11  the lens at the most top part of the second group unit  12  to deeply control, so that the optical system of the multi-group lens assembly  10  conforms to the optical design system requirement, for example, controlling a gap between the fourth lens  1124  and the fifth lens  1221 , so that a gap between the fourth lens  1124  and the fifth lens  1221  meets a predetermined requirement. An extension platform  1112  extends over the inner extension edge  1212 , and can provide support for the outer extension platform  1112  through the inner extension edge  1212 , that is, the first group unit  11  is stably supported by the second group unit  12 , the depth of extension of the first group unit  11  into the second group unit  12  can be adjusted by the setting position of the outer extension platform  1112 . The first group unit  11  extends into the second group unit  12 , so that the external stray light is blocked by the first main body  1111  of the first group unit  11  from entering the multi-group lens assembly  10  through the combined position of the first group unit  11  and the second group unit  12 , and has a better light shielding effect. The outer convex wall  1213  is located outside the outer extension platform  1112  to prevent the connection medium  14  from leaking to the outside, and the outer convex wall  1213  further blocks the external stray light to enter the multi-group lens assembly  10  through the combined position of the first group unit  11  and the second group unit  12 . 
     It is also worth mentioning that there is a fourth gap  18  between the main body lower portion  11116  of the first group unit  11  and the inner extension edge  1212  of the second group unit  12 , so as to adjust the positions of the first group unit  11  and the second group unit  12  in a horizontal direction, and due to a third gap  17  between the outer extension platform  1112  of the first group unit  11  and the outer convex wall  1213  of the second group unit  12 , the relative positions of the first group unit  11  and the second group unit  12  can be adjusted relatively freely in a space, for example, be adjusted mutually in the six-axis direction, and the adjustment of the inner tilt angle can also be in a certain range. Thus, the adjustment range of the first group unit  11  and the second group unit  12  is relative large, thereby making the optical axes of the first group unit  11  consistent with that of the second group unit  12 , and/or it is easy to make the optical system composed of the first group unit  11  and the second group unit  12  meet predetermined requirements and improve imaging quality, which are all unattainable by the traditional integrated lens assembly. 
     Further, according to still another embodiment of the present invention, the first main body  1111  of the first group unit  11  may have at least one first reinforcing groove provided at a bottom position of the first main body  1111 . The first reinforcing groove is used for accommodating a bonding medium to reinforce and fix the lens at the bottom end. For example, in this embodiment of the present invention, the first reinforcing groove is provided at a position corresponding to the fourth lens  1124 , so that the fourth lens  1124  is reinforced and fixed by providing the bonding medium in the first reinforcing groove. The adhering medium and the connection medium  14  may be a same substance or different substances. It should be understood by those skilled in the art that the material types of the connection medium  14  and the adhering medium are not limitations of the present invention. 
     Further, in other embodiments, the first main body  1111  may have a plurality of the first reinforcing grooves spaced and symmetrically arranged at a bottom position of the first main body  1111 , so that the lens is uniformly stressed. For example, four of the first reinforcing grooves are symmetrically arranged at the bottom position of the first main body  1111 . Of course, the number of the first reinforcing grooves may also be other numbers, and the first reinforcing groove can be different shapes, such as a trapezoid, a semicircle, a square, a triangle or a polygon, etc. The first reinforcing groove may also be an annular communicating groove. It will be understood by those skilled in the art that the specific shape and number of the first reinforcing grooves are not limitations of the present invention. The first reinforcing groove may further be a reinforcing fixing hole penetrating the first main body  1111 , and the fourth lens  1124  is reinforced and fixed by providing the adhering medium to the reinforcing fixing hole. 
     Further, according to other embodiments of the present invention, the second main body  1211  of the second group unit  12  may have at least one second reinforcing groove provided at a bottom position of the second main body  1211 . The second reinforcing groove is used for accommodating the adhering medium to reinforce and fix the lens at the bottom end. For example, in this embodiment of the invention, the second reinforcing groove is provided at a position corresponding to the seventh lens  1223 , so that the seventh lens assembly  1223  is reinforced and fixed by providing the adhering medium in the second reinforcing groove. The adhering medium and the connection medium  14  may be a same substance or different substances. It should be understood by those skilled in the art that the material types of the connection medium  14  and the adhering medium are not limitations of the present invention. 
     Further, in other embodiments, the second main body  1211  has a plurality of the second reinforcing grooves spaced and symmetrically arranged at a bottom position of the first main body  1111 . For example, the four reinforcing grooves are symmetrically arranged at the bottom position of the second main body  1211 . Of course, the number of the second reinforcing grooves may be other numbers, and the second reinforcing groove may be different shapes, such as a trapezoid, a semicircle, a square, a triangle or a polygon, etc. The second reinforcing groove may also be an annular communicating groove. It will be understood by those skilled in the art that the specific shape and number of the second reinforcing groove are not limitations of the present invention. The second reinforcing groove may further be a reinforcing fixing hole penetrating the second main body  1211 , and the seventh lens  1223  is reinforced and fixed by providing the adhering medium to the reinforcing fixing hole. 
     Further, the first group unit  11  and the second group unit  12  may each include a pressing ring  19  for fixing the lenses located at the bottom of the first group unit  11  and the bottom of the second group unit  12 , respectively, for example, fixing the first fourth lens  1124  and the seventh lens  1223 . In other words, The pressing ring  19  is provided at a position adjacent to the lens at the bottom end, so as to support and fix the lens at the bottom of the lens. 
     For example, referring to  FIG.  9   , the assembly process of the first group unit  11  can be the following. The first bearing component  111  is first inverted on an assembly worktable, and then the first lens  1121  is assembled to a corresponding position of the first bearing component  111 , so that the first lens  1121  is accommodated in the first accommodating cavity  11111 , and the first lens  1121  is adjusted to meet a predetermined requirement and then fixed, and then the first optical path element  113  is provided at a position corresponding to the first lens  1121 , and continues to assemble the second lens  1122 , the other first optical path element  113 , the third lens  1123 , the other first optical path element  113  and the fourth lens  1124 . After assembling the fourth lens  1124 , applying an adhering medium, such as glue, to the first reinforcing groove corresponding to the fourth lens  1124  to reinforce and fix the fourth lens  1124 , so that the fourth lens  1124  at the bottom of the first main body  1111  is stably connected. And the pressing ring  19  may be first provided, and then the adhering medium is provided for fixing at a position where the pressing ring  19  is located, thereby implementing the assembly of the first group unit  11 . 
     It is worth mentioning that, for the sake of clarity, in this embodiment and the drawings of the present invention, the multi-group lens assembly  10  composed of the first group unit  11  with four lenses and the second group unit  12  with three lenses is described as an example, but in other embodiments of the present invention, the first group unit  11  may include other numbers of lenses, such as one, two, three or more pieces. The second group unit  12  can include other numbers of lenses, such as one, two, three or more pieces. Each of the lenses may be the same lens or different lenses designed according to the requirements of the optical system. 
     After the first group unit  11  and the second group unit  12  are obtained by assembling, the multi-group lens assembly  10  of the present invention can be obtained by assembling the first group unit  11  and the second group unit  12 . The multi-group lens assembly  10  may be assembled separately or may be formed during the process of assembling the camera module  100 . 
     For example, in one way, the assembly process of the multi-group lens assembly  10  can be the following. 
     The connection medium  14 , such as a UV thermosetting glue is first applied in the inner mounting groove  1214  of the second group unit  12 , then the first group unit  11  is overlapped with the second group unit  12 , and the positions of the first group unit  11  and the second group unit  12  are made to be cooperated with each other, for example, so that the outer extension platform  1112  of the first group unit  11  corresponds to the inner mounting groove  1214  of the second group unit  12 , the main body lower portion  11116  of the first main body  1111  extends into the second upper light passing hole  12112  of the second group unit  12 . Active calibration of the first group unit  11  and the second group unit  12  are further performed, so that the optical axes of the first group unit  11  and the second group unit  12  are consistent. Further, the connection medium  14  is provided in the third gap  17 . Further, the first group unit  11  and the second group unit  12  are pre-fixed, for example, the third gap  17  is irradiated with ultraviolet light to pre-cure the connection medium  14 . Finally, the first group unit  11  and the second group unit  12  are cured and fixed, for example, the first group unit  11  and the second group unit  12  are fixed in a baking manner by heating, thereby obtaining the multi-group lens assembly  10 . With such a method, the multi-group lens assembly  10  including more group units can be assembled. 
     For example, in another way, the assembly process of the multi-group lens assembly  10  can be the following. 
     Firstly, active calibration of the first group unit  11  and the second group unit  12  are performed, so that the relative positions of the first group unit  11  and the second group unit  12  are determined, and then the connection medium  14  is applied to the inner mounting groove  1214  of the second group unit  12 , and the first group unit  11  and the second group unit  12  are further provided at an actively calibrated position. Further, the first group unit  11  and the second group unit  12  are pre-fixed, such as by ultraviolet light irradiation, and finally, the first group unit  11  and the second group unit  12  are fixed, for example, the first group unit  11  and the second group unit  12  are fixed in a baking manner by heating. 
     As shown in  FIG.  10   , it is a schematic view of an assembly process of the second group unit  12  of the multi-group lens assembly  10  according to the above-described embodiment of the present invention. In order to facilitate the fixed assembly of the second group unit  12 , the present invention provides an assembly fixture  400  that cooperates with the upper end structure of the second group unit  12 , so that when the second main body  1211  of the second group unit  12  is inverted, it can be stably supported. 
     The assembly fixture  400  has a bearing protrusion  401  that cooperates with the inner mounting groove  1214  of the second bearing component  121  of the second group unit  12 , so that when the second supporting member  121  is inverted on the assembly fixture  400 , the bearing protrusion  401  is accommodated in the inner mounting groove  1214 , and supported by the inner extension edge  1212  of the second bearing component  121 , so that the second bearing component  121  is stably and reversely supported. 
     The bearing protrusion  401  may be an annular structure that cooperates with the annular inner mounting groove  1214 . Of course, when the inner mounting groove  1214  is of other structures, the bearing protrusions  401  can be correspondingly set as a mating structure. 
     For example, the assembly process of the second group unit  12  can be the following. The second bearing component  121  of the second group unit  12  is first inverted on the assembly fixture  400 , then the second optical path element  123  is mounted in the second bearing component  121 , and then the fifth lower lens is mounted in the second bearing component  121 , and continuously, the other optical path element, the sixth lens  1222 , the other optical path element, and the seventh lens  1223  are sequentially assembled. After the assembly of the seventh lens  1223  is implemented, the adhering medium needs to be applied to the second reinforcing groove to reinforce and fix the seventh lens  1223 . 
     Referring to  FIGS.  11 A to  11 C , different ways in which the connection medium  14  can be provided are illustrated. In one way, referring to  FIG.  11 A , two connection media are mainly provided between the outer extension platform  1112  of the first group unit  11  and the inner extension edge  1212  of the second group unit  12 , and between the outer extension platform  1112  of the first group unit  11  and the outer convex wall  1213  of the second group unit  12 , that is, the connection medium  14  is provided in the first gap  15  and the second gap  16  as well as the third gap  17 . 
     In another way, referring to  FIG.  11 B , the connection medium  14  is mainly provided between the outer extension platform  1112  of the first group unit  11  and the inner extension edge  1212  of the second group unit  12 , that is, the connection medium  14  is provided in the first gap  15  and the second gap  16 . 
     In one way, referring to  FIG.  11 C , the connection medium  14  is mainly provided between the outer extension platform  1112  of the first group unit  11  and the outer convex wall  1213  of the second group unit  12 , that is, the connection medium  14  is provided in the third gap  17 . 
     It is worth mentioning that the providing position of the connection medium  14  is related to the multi-group lens assembly  10  and the assembly method of the camera module  100  composed of the multi-group lens assembly, for example, in the manner shown in  FIG.  11 A , the AA calibration may be performed on the first group unit  11  and the second group unit  12 , and then the connection medium  14  is provided in the second group unit  12 , after assembling the first group unit  11  and the second group unit  12 , the connection medium  14  is further provided in the third gap  17  and further fixed, so that the first gap  15 , the second gap  16 , and the three gaps  17  are all filled by the connection medium  14 . That is to say, in this way, the AA calibration is performed firstly, and the glue is applied for fixation, and then complemented to strengthen the fixation. For example, in  FIG.  11 B , the AA calibration may be first performed on the first group unit  11  and the second group unit  12 , and then the connection medium  14  is provided in the second group unit  12 , after the first group unit  11  and the second group unit  12  are assembled, the connection medium  14  is not further provided in the third gap  17 , so that only the first gap  15  and the second gap  16  are filled with the connection medium  14 . For example, in  FIG.  11 C , the connection medium  14  can be directly applied to the third gap  17  during AA adjustment, so that the first group unit  11  and the second group unit  12  are fixedly connected. 
     It can be understood that the filling amount of the connection medium  14  in the first gap  15 , the second gap  16 , and the third gap  17  is not a limitation of the present invention. In the above embodiments and the accompanying drawings, it is only an example to illustrate the possible location of the connection medium  14  and is not absolute. In the specific manufacturing process, one or more of the first gap  15  and the second gap  16  and the third gap  17  may be respectively filled due to the amount and the providing position of the connection medium  14  provided. 
     As shown in  FIG.  12   , a camera module  100  is composed of the multi-group lens assembly  10  of the present invention. The camera module  100  includes a multi-group lens assembly  10 , a photosensitive component  20 , a lens assembly bearing element  30 , and a filter element  40 . 
     The multi-group lens assembly  10  is mounted in the lens assembly bearing element  30 , and the filter element  40  is provided between the multi-group lens assembly  10  and the photosensitive component  20 , so that the light passing through the multi-group lens assembly  10  is filtered by the filter element  40 , and the lens assembly bearing element  30  is mounted on the photosensitive component  20 , so that the multi-group lens assembly  10  is positioned in the photosensitive path of the photosensitive component  20 . 
     In some embodiments, the lens assembly bearing element  30  can be a driving element, such as a piezoelectric motor or a voice coil motor to facilitate forming an autofocus camera module. When the lens assembly bearing element  30  is a driving element, the lens assembly bearing element  30  is electrically connected to the photosensitive component  20 , so as to obtain driving energy through the photosensitive component  20 . 
     In some embodiments, the lens assembly bearing element  30  can be a fixed element, so as to form a fixed focus camera module  100 . 
     Of course, in some embodiments, the lens assembly bearing element  30  may be omitted, and the multi-group lens assembly  10  may be directly mounted on the photosensitive component  20  to form a fixed focus camera module  100 . 
     According to this embodiment of the present invention, the photosensitive component  20  includes a circuit board  21 , a photosensitive element  22 , and a lens assembly holder  23 . The photosensitive element  22  is electrically connected to the circuit board  21 , so as to implement the photoelectric conversion process. For example, in some embodiments, the photosensitive element  22  is mounted on the circuit board  21  by a surface mount process SMT, and is electrically connected to the circuit board  21  through a connection gold wire. In some embodiments, the photosensitive element  22  may be provided on the circuit board  21  by means of a Flip Chip (FC). Of course, the photosensitive element  22  and the circuit board  21  may also have other structural relationships, and the invention is not limited in this aspect. 
     The filter element  40  is mounted on the lens assembly holder  23  above the photosensitive element  22 . The lens assembly holder  23  is mounted on the circuit board  21 . The lens assembly bearing element  30  is mounted on the lens assembly holder  23  to facilitate providing a mounting position through the lens assembly holder  23 . 
     For example, in some embodiments, referring to  FIG.  13   , the assembly process of the camera module  100  may be performed by first forming the photosensitive component  20 , for example, the photosensitive assembly  20  is assembled by assembling the photosensitive element  22 , the circuit board  21  and the lens assembly holder  23 , and then the second group unit  12  is assembled to the lens assembly bearing element  30 . Further, the lens assembly bearing element  30  with the second group unit  12  is mounted on the photosensitive component  20 , such as adhesively fixed to the photosensitive component  20 , and then the first group unit  12  is provided on the second group unit  11 , and AA calibration is performed on the multi-group lens assembly to determine a relative position of the first group unit  11  and the second group unit  12 , and record the relative position. Further, The connection medium  14  is provided between the first group unit  11  and the second group unit  12 , so that the first group unit  11  and the second group unit  12  are stably fixed, thereby the connection medium  14  is squeezed and filled in the first gap  15  and the second gap  16  and the third gap  17  formed by the first group unit  11  and the second group unit  12 . Further, a fixed curing process of the connection medium  14  may be provided, for example, the connection medium  14  is irradiated by ultraviolet light through the third gap  17 , and fixed by baking, so that the first group unit  11  and the second group unit are stably connected and fixed by the connection medium  14 . In particular, when the first bearing component  111  is a driving component, the first bearing component  111  needs to be electrically connected to the photosensitive component  20 , so that the first bearing component  111  obtains driven energy from the photosensitive component  20 . 
     In other words, in this assembly manner, the multi-group lens assembly  10  is simultaneously assembled in the process of assembling the camera module  100 , and when the camera module  100  is assembled, the camera module  100  is optically calibrated by adjusting the relative positions of the first group unit  11  and the second group unit  12 , that is, by adjusting the multi-group lens assembly  10 , the imaging quality of the camera module  100  meets the predetermined standard, which is completely unachievable in the camera module  100  composed of the traditional integrated lens assembly. 
     It is worth mentioning that, as performing the AA calibration, the AA calibration may be performed by adjusting the first group unit  11 , or may be formed by adjusting the overall assembly with the second group unit  12  and the photosensitive component  20 . That is to say, after the first group unit  11  is mounted on the second group unit  12 , two independent integral assemblies are formed to constitute the camera module  100 , and the AA calibration can be implemented by adjusting the upper portion or the lower portion, of course, the AA calibration can also be implemented by adjusting the two portions simultaneously. It will be understood by those skilled in the art that in the process of the AA calibration, relatively adjusted objects, such as first group unit  11  and/or second group unit  12 , are not limitations of the present invention. 
     In other embodiments, referring to  FIG.  14   , the assembly process of the camera module  100  may be performed by assembling the first group unit  11  and the second group unit  12  to form the multi-group lens assembly  10  firstly, and then assembling the multi-group lens assembly  10  to the first bearing component  111 , and then performing the AA calibration when assembling the first bearing component  111  carried with the multi-group lens assembly  10  and the photosensitive assembly  20 , it should be understood by those skilled in the art that the order of the assembly flow of the camera module  100  is not a limitation of the present invention. 
     It is worth mentioning that, referring to  FIG.  15   , a predetermined amount of the connection medium  14  is provided on a top surface of the second group unit  12 , that is, a top surface  12121  of the inner extension edge during assembly, when the first group unit  11  is assembled to the second group unit  12 , a gap between the first group unit  11  and the second group unit  12  and the connection medium  14  change gradually under the interaction of the first group unit  11  and the second group unit  12 , and finally the first gap  15  and the second gap  16  and the third gap  17  with a certain distance are formed. For example, in the process of the first group unit  11  being close to the second group unit  12 , the bottom surface  131  of the adjusting element  13  below the outer extension platform  1112  of the first group unit  11  firstly contacts with the connection medium  14 , and as the first group unit  11  gradually approaches the second group unit  12 , the connection medium  14  moves under the action of the adjusting element  13 , expands to the space where the second gap  16  is located, and fills the second gap  16  until the first gap  15  meets a predetermined range of the AA calibration, that is, the first group unit  11  is made to arrive at the position recorded during the AA calibration. It can be understood that, in this process, since the first gap  15 , the second gap  16 , the third gap  17 , and the fourth gap  18  are in communication with each other, the connection medium  14  can move between the first gap  15 , the second gap  16 , the third gap  17 , and the fourth gap  18 , and since the connection medium  14  has elasticity, so as to make the interaction force of the first group unit  11  and the second group unit  12  relatively moderate, and the adjusting element  13  reduces the contact area where the first group unit  11  and the second group unit  12  interact with each other, so that when the first group unit  11  and the second group unit  12  are assembled, little influence is on the holding positions of the first group unit  11  and/or the second group unit  12 , so as to get closer to the relative position of the previous AA calibration. When more connection medium  14  is applied, the connection medium  14  provides a better buffer function for the first group unit  11  and the second group unit  12 , and the second gap  16  provides an accommodating space for the connection medium  14 , so that the distance of the first gap  15  can reach a distance corresponding to a predetermined AA calibration position, such as a relatively small distance, and due to the movement of the connection medium  14 , the connection medium  14  does not create a large resistance to the first group unit  11  and the second group unit  12 . 
     The providing of the adjustment element  13  and the first gap  15  and the second gap  16  enables the multi-group lens assembly  10  and the camera module  100  composed of the multi-group lens assembly  10  to be performed the AA calibration in actual production process, and a better AA calibration effect can be achieved, and the production yield of the multi-group lens assembly  10  and the camera module  100  is improved, which is suitable for mass production applications. 
     As shown in  FIGS.  16  to  17 B , a multi-group lens assembly  10  according to a second embodiment of the present invention is illustrated. In this embodiment, the second bearing component  121  includes an inner convex wall  1215 , the inner convex wall  1215  extends upwardly from the outside of the second body  1211  and forms an outer mounting groove  1216  with the inner extension edge  1212 . The outer extension platform  1112  of the first group unit  11  is accommodated in the outer mounting groove  1216 . That is, the inner convex wall  1215  partially extends upwardly from the inner extension edge  1212  of the second bearing component  121  to form the outer mounting groove  1216  that communicates with the outside. 
     In this embodiment of the present invention, the inner convex wall  1215  is an annular wall, and correspondingly, the outer mounting groove  1216  is an annular groove. In other embodiments of the present invention, the inner convex wall  1215  may be other structures, such as spaced convex structures, it will be understood by those skilled in the art that the structure of the convex wall is not a limitation of the present invention. 
     Further, the adjusting element  13  is provided below the outer extension platform  1112  of the first bearing component  111  of the first group unit  11  and partially extends downwardly from the outer extension platform  1112 . 
     Further, the adjusting element  13  extends downwardly from the outer portion of the outer extension platform  1112 , that is to say, in this manner, there is a gap between the adjusting element  13  and the outer wall of the first main body  1111 , instead of being integrally connected, so as to cooperate with the structure of the second bearing component  121  of the second group unit  12 . Specifically, the outer extension platform  1112  and the first main body  1111  form a U-shaped structure so as to accommodate the inner convex wall  1215  of the second bearing component  121  of the second group unit  12 . 
     There is the fourth gap  18  between the lower portion of the first main body  1111  and the inner convex wall  1215  so as to adjust the assembling of the first group unit  11  and the second group unit  12 . 
     As shown in  FIGS.  18  and  19   , a multi-group lens assembly  10  in accordance with a third embodiment of the present invention is illustrated. In this embodiment, the outer extension platform  1112  of the first bearing component  111  of the first group unit  11  forms the first gap  15  with the inner extension edge  1212  of the second bearing component  121  of the second group unit  12 , and the connection medium  14  is provided in the first gap  15  to compensate for the difference between the actual production value and the optical design value of the multi-group unit by the AA calibration, so that the imaging quality meets optical design requirements. 
     Further, the surface of the second bearing component  121  of the second group unit  12  is an extended plane that cooperates with the outer extension platform  1112 . 
     That is to say, in this embodiment, the first group unit  11  has no obvious adjusting element  13 , and by controlling the height of the outer extension platform  1112 , the height cooperating relationship of the first group unit  11  and the second group unit  12  and the position of the first gap  15  formed are controlled. 
     In other words, the second group unit  12  does not have the outer convex wall  1213 , so that the top surface of the second group unit  12  forms a flat planar extension structure. 
     In this embodiment, an assembling method of the multi-group lens assembly  10  can be the following. The connection medium  14  is first provided on a top surface of the second group unit  12 , that is, a top surface of the inner extension edge  1212 , and then the first group unit  11  is provided in the second group unit  12 , so that the first group unit  11  extends into the second group unit  12 . Further, the AA calibration is performed to the first group unit  11  and/or the second group unit  12 , so that the imaging quality of the multi-group lens assembly  10  formed by the first group unit  11  and the second group unit  12  meets expected requirements. That is, the first gap  15  is made to meet the requirement of compensating for the difference. The connection medium  14  is then cured, so that the first group unit  11  is stably connected to the second group unit  12 . 
     Referring to  FIGS.  21 A to  21 E , in the above embodiments and the accompanying drawings, the first group unit  11  being four pieces of lenses and the second group unit  12  being three pieces of lenses is taken as an example, and in the other embodiments of the present invention, the number of lenses of the first group unit  11  and the second group unit  12  may be other numbers. 
     For example, in one embodiment, the first group unit  11  includes 3 pieces of lenses, which are a first lens  1121 , a second lens  1122 , and a third lens  1123 . The second group unit  12  includes 4 pieces of lenses, which are a fourth lens  1124 , a fifth lens  1221 , a sixth lens  1222  and a seventh lens  1223 . The first lens  1121 , the second lens  1122 , the third lens  1123 , the fourth lens  1124 , the fifth lens  1221 , the sixth lens  1222 , and the seventh lens  1223  constitute an optical system with 7 pieces of lenses. 
     For example, in one embodiment, the first group unit  11  includes 6 pieces of lenses, which are a first lens  1121 , a second lens  1122 , a third lens  1123 , a fourth lens  1124 , a fifth lens  1221  and a sixth lens  1222 . The second group unit  12  includes a seventh lens  1223 . The first lens  1121 , the second lens  1122 , the third lens  1123 , the fourth lens  1124 , the fifth lens  1221 , the sixth lens  1222  and the seventh lens  1223  constitute an optical system with 7 pieces of lenses. 
     For example, in one embodiment, the first group unit  11  includes a first lens  1121 , and the second group unit  12  includes 6 pieces of lenses, which are a second lens  1122 , a third lens  1123 , a fourth lens  1124 , a fifth lens  1221 , a sixth lens  1222  and a seventh lens  1223 . The first lens  1121 , the second lens  1122 , the third lens  1123 , the fourth lens  1124 , the fifth lens  1221 , the sixth lens  1222 , and the seventh lens  1223  constitute an optical system with 7 pieces of lenses. 
     For example, in one embodiment, the first group unit  11  includes five pieces of lenses, which are a first lens  1121 , a second lens  1122 , a third lens  1123 , a fourth lens  1124 , and a fifth lens  1221 , the second lens unit  12  includes two pieces of lenses, which are a sixth lens  1222  and a seventh lens  1223 , respectively. The first lens  1121 , the second lens  1122 , the third lens  1123 , the fourth lens  1124 , the fifth lens  1221 , the sixth lens  1222 , and the seventh lens  1223  constitute an optical system with 7 pieces of lenses. 
     For example, in one embodiment, the first group unit  11  includes two pieces of lenses, which are a first lens  1121  and a second lens  1122 , respectively, the second group unit  12  includes 5 pieces of lenses, which are a third lens  1123 , a fourth lens  1124 , a fifth lens  1221 , a sixth lens  1222  and a seventh lens  1223 , respectively. The first lens  1121 , the second lens  1122 , the third lens  1123 , the fourth lens  1124 , the fifth lens  1221 , the sixth lens  1222 , and the seventh lens  1223  constitute an optical system with 7 pieces of lenses. 
     In other embodiments of the present invention, the number of lenses of the first group unit  11  and the number of the second group unit  12  may also be a combination of other numbers, so as to form the multi-group lens assembly with different lens numbers, and it will be understood by those skilled in the art that the number of lenses of each group unit of the multi-group unit and the total number of lenses formed are not limitations of the present invention. 
     That is to say, the number of lenses of the first group unit  11  and the second group unit  12  of the multi-group lens assembly  10  with 7 pieces of lenses may be one of a combinations selected from: (4, 3), (3, 4), (6, 1), (1, 6), (5, 2), and (2, 5). Of course, when the total number of lenses of the multi-group lens assembly is other numbers, it may be a combination of the number of lenses in other group units. 
     Referring to  FIG.  22   , the multi-group lens assembly  10  can be assembled and applied to different types of camera modules  100 , and the camera module  100  can be applied to an electronic device  200 , which is by way of example but not limited to a smart mobile phones, a wearable devices, a computer equipment, a television, a vehicle, a camera, surveillance device, etc. The electronic device  200  can include an electronic device main body  300 . The camera module  100  is mounted in the electronic device main body  300 , and cooperates with the electronic device body  300  to implement image collection and reproduction. 
     It should be understood by those skilled in the art that the embodiments of the present invention described in the above description and the accompanying drawings are only by way of illustration and not a limitation of the present invention. The object of the invention has been achieved completely and efficiently. The function and structural principle of the present invention have been shown and described in the embodiments, and the embodiments of the present invention may have any variation or modification without departing from the principle.