Patent Publication Number: US-2022236529-A1

Title: Optical imaging lens group

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the priority from Chinese Patent Application No. 202110095941.8, filed in the National Intellectual Property Administration (CNIPA) on Jan. 25, 2021, the contents of which are hereby incorporated by reference in their entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to the field of optical elements, and in particular, to an optical imaging lens group. 
     BACKGROUND 
     With the rapid development of the lens assembly industry, the imaging quality of optical imaging lens groups used in portable electronic products such as smart phones is getting higher and higher. At the same time, users have more and more requirements for the function of a mobile phone camera, especially in terms of the zoom characteristics of the lens assembly. At present, most mobile phone cameras on the market use mechanical zoom to achieve zoom function. However, a camera having the mechanical zoom function is large in size and not easy to be installed in the mobile phone, and the magnets and coils therein may also interfere with the image quality to a certain extent. 
     In view of the current trend of miniaturization of portable electronic products such as smart phones, the optical imaging lens group applied thereto should meet the characteristics of miniaturization, lightness and thinness as much as possible in order to be compatible with the portable electronic products. How to make the optical imaging lens group have the zoom function on the basis of ensuring the imaging quality and miniaturization, has become one of the problems that many lens assembly designers need to solve urgently. 
     SUMMARY 
     One aspect of the present disclosure provides an optical imaging lens group, and the optical imaging lens group along an optical axis from an object side to an image side sequentially includes: an autofocus assembly, a first lens, a second lens, a third lens, a fourth lens, and at least one subsequent lens, where a radius of curvature of an image-side surface of the autofocus assembly is variable. 
     In an embodiment, at least one of the surfaces from the object-side surface of first lens to the image-side surface of the last lens is aspherical surface. 
     In an embodiment, a radius of curvature R 5  of an object-side surface of the third lens and a radius of curvature R 6  of an image-side surface of the third lens satisfy: 1.5&lt;|R 5 /R 6 |&lt;3.5. 
     In an embodiment, a radius of curvature R 1  of an object-side surface of the first lens and a radius of curvature R 2  of an image-side surface of the first lens satisfy: −3.5&lt;(R 2 /10)|R 1 &lt;−0.5. 
     In an embodiment, a center thickness CT 1  of the first lens on the optical axis and a center thickness CT 4  of the fourth lens on the optical axis satisfy: 1.0&lt;CT 4 /CT 1 &lt;3.0. 
     In an embodiment, a center thickness CT 3  of the third lens on the optical axis and a center thickness CT 5  of the fifth lens on the optical axis satisfy: 1.5&lt;CT 5 /CT 3 &lt;3.5. 
     In an embodiment, a spaced interval T 12  between the first lens and the second lens on the optical axis and a spaced interval T 23  between the second lens and the third lens on the optical axis satisfy: 2.0&lt;T 23 /T 12 &lt;9.5. 
     In an embodiment, an effective focal length f 2  of the second lens and a total effective focal length f of the optical imaging lens group satisfy: −3.0&lt;f 2 /f&lt;−1.0. 
     In an embodiment, an effective focal length f 3  of the third lens and a total effective focal length f of the optical imaging lens group satisfy: −6.5&lt;f 3 /f&lt;−3.0. 
     In an embodiment, a distance TTL from the object-side surface of the first lens to an imaging plane of the optical imaging lens group on the optical axis and half of a diagonal length ImgH of an effective pixel area on the imaging plane of the optical imaging lens group satisfy: 2.0&lt;TTL/ImgH&lt;2.5. 
     In an embodiment, a distance BFL from an image-side surface of a lens closest to an imaging plane of the optical imaging lens group to the imaging plane of the optical imaging lens group on the optical axis and a center thickness D of the autofocus assembly on the optical axis satisfy: 0.5&lt;BFL/D&lt;1. 
     In an embodiment, half of a maximum field-of-view Semi-FOV of the optical imaging lens group satisfies: Semi-FOV≥30°. 
     In an embodiment, the autofocus assembly along the optical axis from the object side sequentially comprises: an optical filter, a liquid material and a flexible film, where the optical filter and the liquid material are cemented together; and the flexible film is arranged on an image-side surface of the liquid material. 
     The present disclosure provides an optical imaging lens group suitable for portable electronic products, having stable image quality, autofocus function, miniaturization, and good imaging quality through a reasonable distribution of the refractive power and optimization of optical parameters. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       By reading detailed description of non-limiting embodiments with reference to the following accompanying drawings, other features, objectives and advantages of the present disclosure will be more apparent: 
         FIG. 1  is a schematic structural diagram illustrating an optical imaging lens group according to Example 1 of the present disclosure; 
         FIGS. 2A-2D  respectively illustrate a longitudinal aberration curve, an astigmatic curve, a distortion curve and a lateral color curve of the optical imaging lens group according to Example 1; 
         FIG. 3A  and  FIG. 3B  respectively illustrate a modulation transfer function (MTF) curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 1 when a distance from the object is 350 mm, within a waveband range of 430 nm to 650 nm; 
         FIG. 4A  and  FIG. 4B  respectively illustrate an MTF curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 1 when a distance from the object is 150 mm, within a waveband range of 430 nm to 650 nm; 
         FIG. 5A  and  FIG. 5B  respectively illustrate an MTF curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 1 when a distance from the object is infinite, within a waveband range of 430 nm to 650 nm; 
         FIG. 6  is a schematic structural diagram illustrating an optical imaging lens group according to Example 2 of the present disclosure; 
         FIGS. 7A-7D  respectively illustrate a longitudinal aberration curve, an astigmatic curve, a distortion curve and a lateral color curve of the optical imaging lens group according to Example 2; 
         FIG. 8A  and  FIG. 8B  respectively illustrate a modulation transfer function (MTF) curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 2 when a distance from the object is 350 mm, within a waveband range of 430 nm to 650 nm; 
         FIG. 9A  and  FIG. 9B  respectively illustrate an MTF curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 2 when a distance from the object is 150 mm, within a waveband range of 430 nm to 650 nm; 
         FIG. 10A  and  FIG. 10B  respectively illustrate an MTF curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 2 when a distance from the object is infinite, within a waveband range of 430 nm to 650 nm; 
         FIG. 11  is a schematic structural diagram illustrating an optical imaging lens group according to Example 3 of the present disclosure: 
         FIGS. 12A-12D  respectively illustrate a longitudinal aberration curve, an astigmatic curve, a distortion curve and a lateral color curve of the optical imaging lens group according to Example 3; 
         FIG. 13A  and  FIG. 13B  respectively illustrate a modulation transfer function (MTF) curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 3 when a distance from the object is 350 mm, within a waveband range of 430 nm to 650 nm; 
         FIG. 14A  and  FIG. 14B  respectively illustrate an MTF curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 3 when a distance from the object is 150 mm, within a waveband range of 430 nm to 650 nm; 
         FIG. 15A  and  FIG. 15B  respectively illustrate an MTF curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 3 when a distance from the object is infinite, within a waveband range of 430 nm to 650 nm; 
         FIG. 16  is a schematic structural diagram illustrating an optical imaging lens group according to Example 4 of the present disclosure; 
         FIGS. 17A-17D  respectively illustrate a longitudinal aberration curve, an astigmatic curve, a distortion curve and a lateral color curve of the optical imaging lens group according to Example 4; 
         FIG. 18A  and  FIG. 18B  respectively illustrate a modulation transfer function (MTF) curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 4 when a distance from the object is 350 mm, within a waveband range of 430 nm to 650 nm; 
         FIG. 19A  and  FIG. 19B  respectively illustrate an MTF curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 4 when a distance from the object is 150 mm, within a waveband range of 430 nm to 650 nm; 
         FIG. 20A  and  FIG. 20B  respectively illustrate an MTF curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 4 when a distance from the object is infinite, within a waveband range of 430 nm to 650 nm; 
         FIG. 21  is a schematic structural diagram illustrating an optical imaging lens group according to Example 5 of the present disclosure: 
         FIGS. 22A-22D  respectively illustrate a longitudinal aberration curve, an astigmatic curve, a distortion curve and a lateral color curve of the optical imaging lens group according to Example 5; 
         FIG. 23A  and  FIG. 23B  respectively illustrate a modulation transfer function (MTF) curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 5 when a distance from the object is 350 mm, within a waveband range of 430 nm to 650 nm; 
         FIG. 24A  and  FIG. 24B  respectively illustrate an MTF curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 5 when a distance from the object is 150 mm, within a waveband range of 430 nm to 650 nm; 
         FIG. 25A  and  FIG. 25B  respectively illustrate an MTF curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 5 when a distance from the object is infinite, within a waveband range of 430 nm to 650 nm; 
         FIG. 26  is a schematic structural diagram illustrating an optical imaging lens group according to Example 6 of the present disclosure; 
         FIGS. 27A-27D  respectively illustrate a longitudinal aberration curve, an astigmatic curve, a distortion curve and a lateral color curve of the optical imaging lens group according to Example 6; 
         FIG. 28A  and  FIG. 28B  respectively illustrate a modulation transfer function (MTF) curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 6 when a distance from the object is 350 mm, within a waveband range of 430 nm to 650 nm; 
         FIG. 29A  and  FIG. 29B  respectively illustrate an MTF curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 6 when a distance from the object is 150 mm, within a waveband range of 430 nm to 650 nm; 
         FIG. 30A  and  FIG. 30B  respectively illustrate an MTF curve diagram and a focus shift curve diagram of the optical imaging lens group in Example 6 when a distance from the object is infinite, within a waveband range of 430 nm to 650 nm; and 
         FIG. 31A  and  FIG. 31B  respectively illustrate schematic structural diagrams of an autofocus assembly in the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     For a better understanding of the present disclosure, various aspects of the present disclosure will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely an illustration for the exemplary implementations of the present disclosure rather than a limitation to the scope of the present disclosure in any way. Throughout the specification, the same reference numerals designate the same elements. The expression “and/or” includes any and all combinations of one or more of the associated listed items. 
     It should be noted that in the specification, the expressions, such as “first.” “second” and “third” are only used to distinguish one feature from another, rather than represent any limitations to the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present disclosure. 
     In the accompanying drawings, the thicknesses, sizes and shapes of the lenses have been slightly exaggerated for the convenience of explanation. Specifically, shapes of spherical surfaces or aspheric surfaces shown in the accompanying drawings are shown by examples. That is, the shapes of the spherical surfaces or the aspheric surfaces are not limited to the shapes of the spherical surfaces or the aspheric surfaces shown in the accompanying drawings. The accompanying drawings are merely illustrative and not strictly drawn to scale. 
     In this text, the paraxial area refers to an area near the optical axis. If the surface of a lens is a convex surface and the position of the convex surface is not defined, it indicates that the surface of the lens is a convex surface at least in the paraxial area; and if the surface of a lens is a concave surface and the position of the concave surface is not defined, it indicates that the surface of the lens is a concave surface at least in the paraxial area. The surface closest to the object in each lens is referred to as the object-side surface, and the surface closest to the image plane in each lens is referred to as the image-side surface. 
     It should be further understood that the terms “comprising,” “including,” “having”, “containing” and/or “contain,” when used in the specification, specify the presence of stated features, elements and/or components, but do not exclude the presence or addition of one or more other features, elements, components and/or combinations thereof. In addition, expressions, such as “at least one of,” when preceding a list of features, modify the entire list of features rather than an individual element in the list. Further, the use of “may,” when describing embodiments of the present disclosure, refers to “one or more embodiments of the present disclosure.” Also, the term “exemplary” is intended to refer to an example or illustration. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. It should be further understood that terms (i.e., those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     It should also be noted that the embodiments in the present disclosure and the features in the embodiments may be combined with each other on a non-conflict basis. The present disclosure will be described below in detail with reference to the accompanying drawings and in combination with the embodiments. 
     The features, principles, and other aspects of the present disclosure are described in detail below. 
     The optical imaging lens group according to exemplary implementations of the present disclosure may include an autofocus assembly and at least five lenses having refractive powers. The at least five lenses having refractive power are a first lens, a second lens, a third lens, a fourth lens and at least one subsequent lens, respectively. The autofocus assembly and the at least five lenses having refractive power are sequentially arranged from the object side to the image side along the optical axis. There may be a spaced interval between the autofocus assembly and the first lens. There may be a spaced interval between any two adjacent lenses from the first lens to a lens closest to an imaging plane. 
     According to an exemplary implementation of the present disclosure, the autofocus assembly along the optical axis from the object side may sequentially include: an optical filter, a liquid material and a flexible film. The optical filter and the liquid material are cemented together, that is, the optical filter and an object-side surface of the liquid material are cemented together, which not only helps to save space of the optical imaging lens group, but also helps to realize an autofocusing function of the lens assembly group. The flexible film may be provided on the image-side surface of the liquid material. 
     According to an exemplary implementation of the present disclosure, a radius of curvature of an image-side surface of the autofocus assembly is variable, that is, the image-side surface of the liquid material and the shape of the flexible film are variable. In other words, the radius of curvature of the image-side surface of the autofocus assembly may be changed with the change of a distance between the optical imaging lens group and the object, so as to realize the autofocusing function of the optical imaging lens group. 
     According to an exemplary implementation of the present disclosure, the autofocus assembly includes: an optical filter, a liquid material and a flexible film.  FIG. 31A  shows a schematic structural diagram of an optical filter T 1 , a liquid material T 2  and a flexible film T 3  in embodiments of the present disclosure, where the liquid material T 2  and the flexible film T 3  are both planar structures.  FIG. 31B  shows a schematic structural diagram of the optical filter T 1 , the liquid material T 2 , and the flexible film T 3  in embodiments of the present disclosure, where the image-side surface of the liquid material T 2  and the flexible film T 3  are deformed. Particularly, the liquid material T 2  may be disposed between the optical filter T 1  and the flexible film T 3 , and the liquid material T 2  may be connected to a conductive material (not shown). When an external voltage is applied to the conductive material, the image-side surface of the liquid material T 2  may be deformed, which in turn drives the flexible film T 3  to deform, and thus changes the focal length of the autofocus assembly, thereby adjusting the total effective focal length of the optical imaging lens group. It should be understood that the liquid material T 2  in embodiments of the present disclosure does not only include one material. In actual production, in order to reasonably adjust the total effective focal length of the optical imaging lens group, a variety of liquid materials, such as a first liquid material and a second liquid material, may be disposed between the optical filter T 1  and the flexible film T 3  according to specific needs. In addition, the first liquid material, the second liquid material, and the like are not compatible with each other. When a voltage is applied to the conductive material, the liquid material T 2  may be deformed, which in turn drives the flexible film T 3  and the surface type of the contact surface between the first liquid material and the second liquid material to change, so that the focal length of the autofocus assembly is changed, thereby adjusting the total effective focal length of the optical imaging lens group. 
     According to an exemplary implementation of the present disclosure, drive systems such as voice coil motors, micro-electromechanical systems, piezoelectric systems, and memory metals may be used to apply a voltage to the conductive material. The drive system may adjust the focal length of the optical imaging lens group to make the optical imaging lens group have a good imaging position, so that the optical imaging lens group can clearly image at different distances from the object. 
     In an exemplary implementation, the optical imaging lens group may satisfy: 1.5&lt;|R 5 /R 6 |&lt;3.5, where R 5  is a radius of curvature of an object-side surface of the third lens, and R 6  is a radius of curvature of an image-side surface of the third lens. More particularly, R 5  and R 6  may further satisfy: 1.5&lt;|R 5 /R 6 |&lt;3.2. Satisfying 1.5&lt;|R 5 /R 6 |&lt;3.5 may effectively constrain the shape of the third lens, and then may effectively control an aberration contribution rate of the object-side surface and the image-side surface of the third lens, so as to effectively balance aberrations related to the lens assembly group and an aperture band, and effectively improve an imaging quality of the lens assembly group. 
     In an exemplary implementation, the optical imaging lens group may satisfy: −3.5&lt;(R 2 /10)/R 1 &lt;−0.5, where R 1  is a radius of curvature of an object-side surface of the first lens, and R 2  is a radius of curvature of an image-side surface of the first lens. More particularly, R 2  and R 1  may further satisfy: −3.5&lt;(R 2 /10)/R 1 &lt;−0.9. By satisfying −3.5&lt;(R 2 /10)/R 1 &lt;−0.5, the first lens contributes to the large object-side field-of-view, thereby effectively balancing an on-axis aberration generated by the optical imaging lens group, and improving the ability of subsequent lenses to correct an off-axis aberration. 
     In an exemplary implementation, the optical imaging lens group may satisfy: 1.0&lt;CT 4 /CT 1 &lt;3.0, where CT 1  is a center thickness of the first lens on the optical axis, and CT 4  is a center thickness of the fourth lens on the optical axis. More particularly, CT 4  and CT 1  may further satisfy: 1.0&lt;CT 4 /CT 1 &lt;2.9. Satisfying 1.0&lt;CT 4 /CT 1 &lt;3.0 may control the distortion contribution of each field-of-view of the optical imaging lens group within a reasonable range, thereby helping to improve the imaging quality. 
     In an exemplary implementation, the optical imaging lens group may satisfy: 1.5&lt;CT 5 /CT 3 &lt;3.5, where CT 3  is a center thickness of the third lens on the optical axis, and CT 5  is a center thickness of the fifth lens on the optical axis. More particularly, CT 5  and CT 3  may further satisfy: 1.5&lt;CT 5 /CT 3 &lt;3.3. Satisfying 1.5&lt;CT 5 /CT 3 &lt;3.5 may control the distortion contribution of each field-of-view of the optical imaging lens group within a reasonable range, thereby helping to improve the imaging quality. 
     In an exemplary implementation, the optical imaging lens group may satisfy: 2.0&lt;T 23 /T 12 &lt;9.5, where T 12  is a spaced interval between the first lens and the second lens on the optical axis, and T 23  is a spaced interval between the second lens and the third lens on the optical axis. More particularly, T 23  and T 12  may further satisfy: 2.0&lt;T 23 /T 12 &lt;9.3. Satisfying 2.0&lt;T 23 /T 12 &lt;9.5 may control a field curvature and distortion produced by the subsequent lenses within a certain range, so that an off-axis field-of-view of the lens assembly group has a good imaging quality. 
     In an exemplary implementation, the optical imaging lens group may satisfy: −3.0&lt;f 2 /f&lt;−1.0, where f 2  is an effective focal length of the second lens, and f is a total effective focal length of the optical imaging lens group. More particularly, f 2  and f may further satisfy: −2.8&lt;f 2 /f&lt;−1.3. Satisfying −3.0&lt;f 2 /f&lt;−1.0 may reduce a deflection angle of light, and improve the imaging quality of the optical imaging lens group. 
     In an exemplary implementation, the optical imaging lens group may satisfy: −6.5&lt;f 3 /f&lt;−3.0, where f 3  is an effective focal length of the third lens, and f is a total effective focal length of the optical imaging lens group. More particularly, f 3  and f may further satisfy: −6.3&lt;f 3 /f&lt;−3.1. Satisfying −6.5&lt;f 3 /f&lt;−3.0 may constrain an on-axis spherical aberration generated by the third lens within a reasonable interval, thereby ensuring the imaging quality of an on-axis field-of-view of the optical imaging lens group. 
     In an exemplary implementation, the optical imaging lens group may satisfy: 2.0&lt;TTL/ImgH&lt;2.5, where TTL is a distance from the object-side surface of the first lens to an imaging plane of the optical imaging lens group on the optical axis, and ImgH is half of a diagonal length of an effective pixel area on the imaging plane of the optical imaging lens group. More particularly, TTL and ImgH may further satisfy: 2.0&lt;TTL/ImgH&lt;2.1. Satisfying 2.0&lt;TTL/ImgH&lt;2.5 is conducive to the realization of characteristics such as miniaturization and high pixel of the optical imaging lens group. 
     In an exemplary implementation, the optical imaging lens group may satisfy: 0.5&lt;BFL/D&lt;1, where BFL is a distance from an image-side surface of a lens closest to an imaging plane of the optical imaging lens group to the imaging plane of the optical imaging lens group on the optical axis, and D is a center thickness of the autofocus assembly on the optical axis. Satisfying 0.5&lt;BFL/D&lt;1 may constrain the on-axis spherical aberration within a reasonable interval to improve the imaging quality of the optical imaging lens group. 
     In an exemplary implementation, the optical imaging lens group may satisfy: Semi-FOV≥30°, where Semi-FOV is half of a maximum field-of-view of the optical imaging lens group. More particularly. Semi-FOV may further satisfy: Semi-FOV≥32°. Satisfying Semi-FOV≥30° is conducive to obtaining a large field-of-view and improving the ability of the optical imaging lens group to collect object information. 
     In an exemplary implementation, the optical imaging lens group further includes a diaphragm provided between the autofocus assembly and the first lens. Alternatively, the optical imaging lens group may further include a protective glass for protecting a photosensitive element on the imaging plane. Embodiments of the present disclosure propose an optical imaging lens group having characteristics such as miniaturization, autofocus, stable image quality, and high imaging quality. The optical imaging lens group according to the above implementations of the present disclosure may employ a plurality of lenses, such as five lenses as described above. By reasonably distributing the refractive powers of the lenses, the surface shapes, the center thicknesses of the respective lenses and the spaced intervals along the optical axis between the lenses, it may effectively converge incident light, reduce a total track length of the imaging lens assembly and improve the processability of the imaging system, making the optical imaging lens group more conducive to production and processing. 
     In implementations of the present disclosure, at least one of the surfaces of the lenses is an aspheric surface, that is, at least one of the surfaces from the object-side surface of the first lens to the image-side surface of the last lens is an aspheric surface. The characteristic of the aspheric lens is: the curvature is continuously changing from the center of the lens to the periphery of the lens. Unlike the spherical lens with a constant curvature from the center of the lens to the periphery, the aspheric lens has a better radius of curvature characteristic, having advantages of improving the distortion aberration and improving the astigmatic aberration. The use of the aspheric lens can eliminate as much as possible the aberrations that occur during the imaging, thereby improving the imaging quality. Alternatively, at least one of the object-side surface and the image-side surface of each of the first lens, the second lens, the third lens, the fourth lens and at least one subsequent lens is an aspheric surface. Alternatively, the object-side surface and the image-side surface of each of the first lens, the second lens, the third lens, the fourth lens and at least one subsequent lens are aspheric surfaces. 
     However, it should be understood by those skilled in the art that the various results and advantages described in the present specification may be obtained by changing the number of the lenses constituting the optical imaging lens group without departing from the technical solution claimed by the present disclosure. For example, although the optical imaging lens group having five lenses or six lenses is described as an example in the implementations, the optical imaging lens group is not limited to include five lenses or six lenses. If desired, the optical imaging lens group may also include other numbers of lenses. 
     Examples of the optical imaging lens group that may be applied to the above implementations are further described below with reference to the accompanying drawings. 
     Example 1 
     An optical imaging lens group according to Example 1 of the present disclosure is described below with reference to  FIGS. 1-5B .  FIG. 1  is a schematic structural diagram illustrating the optical imaging lens group according to Example 1 of the present disclosure. 
     As shown in  FIG. 1 , the optical imaging lens group from an object side to an image side sequentially includes: an autofocus assembly T (including an optical filter, a liquid material and a flexible film), a diaphragm STO, a first lens E 1 , a second lens E 2 , a third lens E 3 , a fourth lens E 4 , a fifth lens E 5 , a sixth lens E 6  and an imaging plane S 13 . 
     The first lens E 1  has positive refractive power, an object-side surface S 1  of the first lens is a convex surface, and an image-side surface S 2  of the first lens is a convex surface. The second lens E 2  has negative refractive power, an object-side surface S 3  of the second lens is a concave surface, and an image-side surface S 4  of the second lens is a concave surface. The third lens E 3  has negative refractive power, an object-side surface S 5  of the third lens is a convex surface, and an image-side surface S 6  of the third lens is a concave surface. The fourth lens E 4  has positive refractive power, an object-side surface S 7  of the fourth lens is a concave surface, and an image-side surface S 8  of the fourth lens is a convex surface. The fifth lens E 5  has positive refractive power, an object-side surface S 9  of the fifth lens is a concave surface, and an image-side surface S 10  of the fifth lens is a convex surface. The sixth lens E 6  has negative refractive power, an object-side surface S 11  of the sixth lens is a convex surface, and an image-side surface S 12  of the sixth lens is a concave surface. Light from an object sequentially passes through the optical filter to the image-side surface S 12  of the sixth lens E 6  and is finally imaged on the imaging plane  13 . 
     Table 1 is a table illustrating basic parameters of the optical imaging lens group of Example 1, where the units for the radius of curvature, the thickness/distance and the focal length are millimeter (mm). 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                   
                   
                   
                   
                 Material 
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface 
                 Surface 
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe 
                 Focal 
                 Conic 
               
               
                 number 
                 type 
                 curvature 
                 Distance 
                 index 
                 number 
                 length 
                 coefficient 
               
               
                   
               
               
                 OBJ 
                 Spherical 
                 infinite 
                 D1 
                   
                   
                   
                   
               
               
                   
                 Spherical 
                 infinite 
                 0.2100 
                 1.52 
                 64.2 
                   
                   
               
               
                   
                   
                 infinite 
                 0.2650 
                 1.55 
                 29.9 
                   
                   
               
               
                   
                   
                 RT 
                 0.0200 
                 1.53 
                 65.4 
                   
                   
               
               
                   
                   
                   
                 0.5014 
                   
                   
                   
                   
               
               
                 STO 
                 Spherical 
                 infinite 
                 −0.2587 
                   
                   
                   
                   
               
               
                 S1 
                 Aspheric 
                 1.6201 
                 0.6894 
                 1.55 
                 56.1 
                 2.89 
                 −0.5929 
               
               
                 S2 
                 Aspheric 
                 −49.5013 
                 0.0523 
                   
                   
                   
                 −90.0000 
               
               
                 S3 
                 Aspheric 
                 −54.1298 
                 0.2878 
                 1.67 
                 20.4 
                 −7.14 
                 90.0000 
               
               
                 S4 
                 Aspheric 
                 5.2246 
                 0.4800 
                   
                   
                   
                 −36.5869 
               
               
                 S5 
                 Aspheric 
                 8.8787 
                 0.2897 
                 1.67 
                 20.4 
                 −22.51 
                 70.1770 
               
               
                 S6 
                 Aspheric 
                 5.5049 
                 0.1561 
                   
                   
                   
                 −40.8963 
               
               
                 S7 
                 Aspheric 
                 −4.5183 
                 0.9823 
                 1.55 
                 56.1 
                 9.52 
                 −64.1922 
               
               
                 S8 
                 Aspheric 
                 −2.6031 
                 0.4535 
                   
                   
                   
                 −7.6668 
               
               
                 S9 
                 Aspheric 
                 −330.6803 
                 0.5099 
                 1.55 
                 56.1 
                 26.42 
                 90.0000 
               
               
                 S10 
                 Aspheric 
                 −13.8248 
                 0.0351 
                   
                   
                   
                 19.8743 
               
               
                 S11 
                 Aspheric 
                 5.1427 
                 0.7290 
                 1.54 
                 55.8 
                 −4.27 
                 −6.1367 
               
               
                 S12 
                 Aspheric 
                 1.5061 
                 0.7464 
                   
                   
                   
                 −5.3965 
               
               
                 S13 
                 Spherical 
                 infinite 
                   
                   
                   
                   
                   
               
               
                   
               
            
           
         
       
     
     In this example, the optical filter and the liquid material may be cemented together. By changing the radius of curvature of a flexible film surface of the autofocus assembly T and the radius of curvature of an image-side surface of the liquid material, the total effective focal length of the optical imaging lens group may be changed with the change of a distance from the object, thereby realizing the autofocusing function of the optical imaging lens group. Particularly, when the distance D 1  between the optical imaging lens group and the object is 350 mm, the image-side surface of the autofocus assembly T (i.e., the image-side surface of the liquid material and the flexible film surface) is a plane, and the radius of curvature RT is infinite. When the distance D 1  between the optical imaging lens group and the object is 150 mm, the image-side surface of the autofocus assembly T is a concave surface, and the radius of curvature RT is 3.5000. When the distance D 1  between the optical imaging lens group and the object is infinite, the image-side surface of the autofocus assembly T is a convex surface, and the radius of curvature RT is −4.7200. 
     In this example, a total effective focal length f of the optical imaging lens group is 4.32 mm, a total track length TTL of the optical imaging lens group (that is, a distance from the object-side surface of the optical filter T 1  to the imaging plane S 13  of the optical imaging lens group on the optical axis) is 6.10 mm, half of a diagonal length ImgH of an effective pixel area on the imaging plane S 13  of the optical imaging lens group is 3.01 mm, half of a maximum field-of-view Semi-FOV of the optical imaging lens group is 33.5°, and an F number Fno of the optical imaging lens group is 2.47. 
     In Example 1, the object-side surface and the image-side surface of any one of the first lens E 1  to the sixth lens E 6  are aspheric. The surface shape x of each aspheric lens may be defined by using, but not limited to, the following aspheric formula: 
     
       
         
           
             
               
                 
                   x 
                   = 
                   
                     
                       
                         ch 
                         2 
                       
                       
                         1 
                         + 
                         
                           
                             1 
                             - 
                             
                               
                                 ( 
                                 
                                   k 
                                   + 
                                   1 
                                 
                                 ) 
                               
                               ⁢ 
                               
                                 c 
                                 2 
                               
                               ⁢ 
                               
                                 h 
                                 2 
                               
                             
                           
                         
                       
                     
                     + 
                     
                       ∑ 
                       
                         Aih 
                         i 
                       
                     
                   
                 
               
               
                 
                   ( 
                   1 
                   ) 
                 
               
             
           
         
       
     
     Where, x is the sag—the axis-component of the displacement of the surface from the aspheric vertex, when the surface is at height h from the optical axis; c is a paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is reciprocal of the radius of curvature R in the above Table 1); k is a conic coefficient; Ai is a correction coefficient for the i-th order of the aspheric surface. Table 2 below shows high-order coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18  and A 20  applicable to each aspheric surface S 1  to S 12  in Example 1. 
     
       
         
           
               
               
               
               
               
               
               
               
               
               
             
               
                 TABLE 2 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 number 
                 A4 
                 A6 
                 A8 
                 A10 
                 A12 
                 A14 
                 A16 
                 A18 
                 A20 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 S1 
                  1.0296E−02 
                 −2.4203E−04 
                 −1.4226E−04 
                 −2.8771E−05 
                 −4.2040E−06  
                 −7.9621E−07 
                 −1.4047E−07 
                  1.8692E−07 
                  4.2623E−08 
               
               
                 S2 
                 −5.5534E−03 
                  1.7644E−04 
                 −7.6308E−04 
                  1.8111E−04 
                 −2.6962E−05  
                  8.6179E−06 
                  9.9705E−06 
                  6.7136E−06 
                  1.6807E−06 
               
               
                 S3 
                  1.0319E−02 
                  3.5280E−03 
                 −4.2814E−04 
                  2.4584E−04 
                 −3.3894E−05  
                 −1.1887E−06 
                  1.6944E−06 
                  2.3219E−06 
                  7.6846E−07 
               
               
                 S4 
                  1.8089E−02 
                  2.2612E−03 
                  9.2393E−06 
                  1.4574E−04 
                 −1.5613E−05 
                 −2.8036E−06 
                 −1.1931E−06 
                  2.7139E−07 
                 −2.9233E−07 
               
               
                 S5 
                 −1.3718E−01 
                 −2.1811E−03  
                 −4.0528E−04 
                  1.6685E−04 
                  1.6111E−05  
                 −8.6210E−06 
                 −1.1876E−05 
                 −2.5638E−06 
                 −1.4730E−06 
               
               
                 S6 
                 −1.2537E−01 
                  1.3528E−02 
                  1.7672E−03 
                  6.7892E−04 
                  2.2966E−04 
                 −1.5683E−06 
                 −4.2877E−05 
                 −1.3144E−05  
                 −4.3326E−07 
               
               
                 S7 
                 −7.8883E−02 
                  1.4772E−02 
                 −1.6314E−03 
                  4.1378E−05 
                  2.5336E−04  
                  7.3899E−05 
                 −3.4555E−05 
                 −1.2093E−05 
                  6.8585E−07 
               
               
                 S8 
                 −4.8903E−02 
                  3.5957E−02 
                 −1.9871E−02 
                 −8.9538E−04 
                  8.5157E−04  
                 −2.6132E−04 
                 −5.9855E−05 
                  1.1045E−04 
                  5.3485E−05 
               
               
                 S9 
                 −1.3920E−01 
                 −9.2185E−03  
                  4.1265E−03 
                 −3.7932E−03 
                  1.9884E−03 
                 −5.3684E−04 
                  4.3315E−05 
                 −6.3244E−05 
                  1.7739E−05 
               
               
                 S10 
                  1.1645E−02 
                 −1.3014E−02  
                 −3.4175E−03 
                 −1.1953E−03 
                  1.3716E−03  
                 −1.4832E−03 
                  4.3250E−04 
                 −1.3907E−04 
                  8.4365E−05 
               
               
                 S11 
                 −7.4011E−01  
                  2.6516E−01 
                 −1.0114E−01 
                  2.9875E−02 
                 −1.0111E−02  
                  2.9050E−03 
                 −9.5191E−05 
                 −1.2255E−04 
                  1.2168E−04 
               
               
                 S12 
                 −9.8969E−01 
                  1.5224E−01 
                 −8.6318E−02 
                  1.7272E−02 
                 −1.3166E−02 
                  4.4595E−03 
                 −4.6653E−04 
                  8.4923E−04 
                 −1.4684E−04 
               
               
                   
               
            
           
         
       
     
       FIG. 2A  illustrates the longitudinal aberration curve of the optical imaging lens group according to Example 1, representing deviations of focal points converged by light of different wavelengths after passing through the lens assembly.  FIG. 2B  illustrates the astigmatic curve of the optical imaging lens group according to Example 1, representing a curvature of a tangential plane and a curvature of a sagittal plane.  FIG. 2C  illustrates the distortion curve of the optical imaging lens group according to Example 1, representing the amounts of distortion corresponding to different image heights.  FIG. 2D  illustrates the lateral color curve of the optical imaging lens group according to Example 1, representing deviations of different image heights on an imaging plane after light passes through the lens assembly.  FIG. 3A ,  FIG. 4A  and  FIG. 5A  respectively illustrate MTF curve diagrams within a waveband range of 430 nm-650 nm of the optical imaging lens group in Example 1, w % ben the distances from the object are 350 mm, 150 mm and infinite respectively, representing the pixel size of a tangential field-of-view and a sagittal field-of-view at different frequencies.  FIG. 3B ,  FIG. 4B  and  FIG. 5B  respectively illustrate focus shift curve diagrams within a waveband range of 430 nm-650 nm of the optical imaging lens group in Example 1, when the distances from the object are 350 mm, 150 mm and infinite respectively, representing the pixel size of a tangential field-of-view and a sagittal field-of-view under different focal shifts (that is, a difference between the actual focal length and a theoretical focal length). It can be seen from  FIG. 2A  to  FIG. 5B  that the optical imaging lens group provided in Example 1 can achieve good imaging quality. 
     Example 2 
     An optical imaging lens group according to Example 2 of the present disclosure is described below with reference to  FIG. 6  to  FIG. 10B . In this example and the following examples, for the purpose of brevity, the description of parts similar to those in Example 1 will be omitted.  FIG. 6  illustrates a schematic structural diagram of the optical imaging lens group according to Example 2 of the present disclosure. 
     As shown in  FIG. 6 , the optical imaging lens group from an object side to an image side sequentially includes: an autofocus assembly T (including an optical filter, a liquid material and a flexible film), a diaphragm STO, a first lens E 1 , a second lens E 2 , a third lens E 3 , a fourth lens E 4 , a fifth lens E 5 , a sixth lens E 6  and an imaging plane S 13 . 
     The first lens E 1  has positive refractive power, an object-side surface S 1  of the first lens is a convex surface, and an image-side surface S 2  of the first lens is a convex surface. The second lens E 2  has negative refractive power, an object-side surface S 3  of the second lens is a concave surface, and an image-side surface S 4  of the second lens is a concave surface. The third lens E 3  has negative refractive power, an object-side surface S 5  of the third lens is a convex surface, and an image-side surface S 6  of the third lens is a concave surface. The fourth lens E 4  has positive refractive power, an object-side surface S 7  of the fourth lens is a convex surface, and an image-side surface S 8  of the fourth lens is a convex surface. The fifth lens E 5  has positive refractive power, an object-side surface S 9  of the fifth lens is a convex surface, and an image-side surface S 10  of the fifth lens is a concave surface. The sixth lens E 6  has negative refractive power, an object-side surface S 11  of the sixth lens is a convex surface, and an image-side surface S 12  of the sixth lens is a concave surface. Light from an object sequentially passes through the optical filter to the image-side surface S 12  of the sixth lens E 6  and is finally imaged on the imaging plane S 13 . 
     In this example, a total effective focal length f of the optical imaging lens group is 4.24 mm, a total track length TTL of the optical imaging lens group is 6.08 mm, half of a diagonal length ImgH of an effective pixel area on the imaging plane S 13  of the optical imaging lens group is 3.01 mm, half of a maximum field-of-view Semi-FOV of the optical imaging lens group is 34.00 and an F number Fno of the optical imaging lens group is 2.47. 
     Table 3 is a table illustrating basic parameters of the optical imaging lens group of Example 2, where the units for the radius of curvature, the thickness/distance and the focal length are millimeter (mm). Table 4 shows high-order coefficients applicable to each aspheric surface in Example 2, where the surface shape of each aspheric surface may be defined by the formula (1) given in the above Example 1. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 3 
               
             
            
               
                   
               
               
                   
                   
                   
                   
                 Material 
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface 
                 Surface 
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe 
                 Focal 
                 Conic 
               
               
                 number 
                 type 
                 curvature 
                 Distance 
                 index 
                 number 
                 length 
                 coefficient 
               
               
                   
               
               
                 OBJ 
                 Spherical 
                 infinite 
                 D1 
                   
                   
                   
                   
               
               
                   
                 Spherical 
                 infinite 
                 0.2100 
                 1.52 
                 64.2 
                   
                   
               
               
                   
                   
                 infinite 
                 0.2650 
                 1.55 
                 29.9 
                   
                   
               
               
                   
                   
                 RT 
                 0.0200 
                 1.53 
                 65.4 
                   
                   
               
               
                   
                   
                   
                 0.5014 
                   
                   
                   
                   
               
               
                 STO 
                 Spherical 
                 infinite 
                 −0.2356 
                   
                   
                   
                   
               
               
                 S1 
                 Aspheric 
                 1.7260 
                 0.6643 
                 1.55 
                 56.1 
                 3.09 
                 −0.5682 
               
               
                 S2 
                 Aspheric 
                 −60.0000  
                 0.0505 
                   
                   
                   
                 −90.0000 
               
               
                 S3 
                 Aspheric 
                 −51.0127 
                 0.3922 
                 1.67 
                 20.4 
                 −7.12 
                 90.0000 
               
               
                 S4 
                 Aspheric 
                 5.2502 
                 0.3108 
                   
                   
                   
                 −78.7024 
               
               
                 S5 
                 Aspheric 
                 8.3957 
                 0.2800 
                 1.67 
                 20.4 
                 −19.25 
                 65.2622 
               
               
                 S6 
                 Aspheric 
                 5.0071 
                 0.0772 
                   
                   
                   
                 −5.2622 
               
               
                 S7 
                 Aspheric 
                 40.0000 
                 1.0000 
                 1.55 
                 56.1 
                 12.32 
                 90.0000 
               
               
                 S8 
                 Aspheric 
                 −8.0147  
                 0.3089 
                   
                   
                   
                 16.6918 
               
               
                 S9 
                 Aspheric 
                 3.5800  
                 0.7500 
                 1.55 
                 56.1 
                 19.27 
                 −30.4183 
               
               
                 S10 
                 Aspheric 
                 5.0253 
                 0.3040 
                   
                   
                   
                 2.8691 
               
               
                 S11 
                 Aspheric 
                 20.8277 
                 0.6000 
                 1.54 
                 55.8 
                 −4.22 
                 20.0090 
               
               
                 S12 
                 Aspheric 
                 2.0207 
                 0.5823 
                   
                   
                   
                 −9.3778 
               
               
                 S13 
                 Spherical 
                 infinite 
                   
                   
                   
                   
                   
               
               
                   
               
            
           
         
       
     
     In this example, the optical filter and the liquid material may be cemented together. By changing the radius of curvature of a flexible film surface of the autofocus assembly T and the radius of curvature of an image-side surface of the liquid material, the total effective focal length of the optical imaging lens group may be changed with the change of a distance from the object, thereby realizing the autofocusing function of the optical imaging, lens group. When the distance D 1  between the optical imaging lens group and the object is 350 mm, the image-side surface of the autofocus assembly T is a plane, and the radius of curvature RT is infinite. When the distance D 1  between the optical imaging lens group and the object is 150 mm, the image-side surface of the autofocus assembly T is a concave surface, and the radius of curvature RT is 3.5100. When the distance D 1  between the optical imaging lens group and the object is infinite, the image-side surface of the autofocus assembly T is a convex surface, and the radius of curvature RT is −4.7000. 
     
       
         
           
               
               
               
               
               
               
               
               
               
               
             
               
                 TABLE 4 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 number 
                 A4 
                 A6 
                 A8 
                 A10 
                 A12 
                 A14 
                 A16 
                 A18 
                 A20 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 S1 
                  1.0698E−02 
                  2.9047E−04 
                 −1.3499E−05 
                 −4.5550E−06 
                 −5.5519E−07 
                 −3.0859E−07 
                 −1.2225E−07  
                 −6.4487E−08  
                  7.1798E−08 
               
               
                 S2 
                  1.6635E−02 
                 −6.2880E−04 
                 −1.3447E−03 
                 −8.6848E−04 
                 −4.7305E−04 
                 −1.1744E−04  
                 −3.8421E−06  
                  1.1750E−05 
                  3.5828E−06 
               
               
                 S3 
                  8.8145E−03 
                  1.9865E−03 
                  1.1115E−04 
                  7.3044E−05 
                 −2.2719E−05  
                 −6.4188E−06 
                 −2.6706E−06 
                 −5.2677E−08 
                  3.0250E−07 
               
               
                 S4 
                  7.0583E−03 
                 −2.0357E−03 
                  5.1697E−04 
                  1.0793E−04  
                  1.2115E−04 
                  6.9786E−05  
                  3.5630E−05 
                  1.1723E−05 
                  2.1670E−06 
               
               
                 S5 
                 −1.2904E−01 
                 −3.8264E−03  
                 −6.7258E−04 
                  2.2485E−06 
                 −5.9759E−05 
                 −9.2584E−06 
                 −3.9346E−06 
                  1.3508E−06 
                 −1.2062E−07 
               
               
                 S6 
                 −1.0611E−01 
                  1.6448E−02 
                  2.1024E−04 
                  5.8884E−04 
                 −1.5351E−04  
                 −2.3987E−05 
                 −8.6251E−07  
                  1.2119E−05 
                  2.3025E−08 
               
               
                 S7 
                 −3.1278E−02 
                  1.6319E−02 
                 −1.4024E−03 
                  6.0811E−04  
                 −1.4066E−04 
                 −5.5211E−05 
                  1.6483E−06 
                  1.4525E−05 
                 −1.9043E−06 
               
               
                 S8 
                 −2.7974E−01 
                  7.7526E−02 
                  4.3655E−03 
                  3.1422E−03 
                 −2.7204E−03 
                 −2.2246E−03 
                 −1.0961E−03 
                 −3.1587E−04 
                 −5.9137E−05 
               
               
                 S9 
                 −5.5362E−01 
                 −2.1349E−02  
                  5.3442E−03 
                  1.7192E−03 
                  1.1096E−03 
                  2.1137E−05  
                 −9.4731E−05 
                 −7.4130E−05 
                 −1.7671E−05 
               
               
                 S10 
                 −5.0099E−01 
                 −2.7629E−02 
                  3.5507E−03 
                 −3.7470E−03 
                  4.9740E−04 
                 −1.1798E−04  
                 −2.0482E−04 
                  2.6472E−05 
                 −1.6554E−06 
               
               
                 S11 
                 −2.9963E−01 
                  1.0984E−01 
                 −7.4837E−02 
                  5.3471E−02  
                 −1.9835E−02 
                  1.2383E−02  
                 −3.3726E−03  
                  2.0055E−03 
                 −4.1789E−04 
               
               
                 S12 
                 −1.2857E+00 
                  1.0121E−01 
                 −7.8000E−02 
                  2.4552E−02  
                 −8.1869E−03 
                  5.7698E−03  
                 −3.9455E−03  
                 −1.0519E−03 
                 −1.0787E−03 
               
               
                   
               
            
           
         
       
     
       FIG. 7A  illustrates the longitudinal aberration curve of the optical imaging lens group according to Example 2, representing deviations of focal points converged by light of different wavelengths after passing through the lens assembly.  FIG. 7B  illustrates the astigmatic curve of the optical imaging lens group according to Example 2, representing a curvature of a tangential plane and a curvature of a sagittal plane.  FIG. 7C  illustrates the distortion curve of the optical imaging lens group according to Example 2, representing the amounts of distortion corresponding to different image heights.  FIG. 7D  illustrates the lateral color curve of the optical imaging lens group according to Example 2, representing deviations of different image heights on an imaging plane after light passes through the lens assembly.  FIG. 8A ,  FIG. 9A  and  FIG. 10A  respectively illustrate MTF curve diagrams within a waveband range of 430 nm-650 nm of the optical imaging lens group in Example 2, w % ben the distances from the object are 350 mm, 150 mm and infinite respectively, representing the pixel size of a tangential field-of-view and a sagittal field-of-view at different frequencies.  FIG. 8B ,  FIG. 9B  and  FIG. 10B  respectively illustrate focus shift curve diagrams within a waveband range of 430 nm-650 nm of the optical imaging lens group in Example 2, when the distances from the object are 350 mm, 150 mm and infinite respectively, representing the pixel size of a tangential field-of-view and a sagittal field-of-view under different focal shifts. It can be seen from  FIG. 7A  to  FIG. 10B  that the optical imaging lens group provided in Example 2 can achieve good imaging quality. 
     Example 3 
     An optical imaging lens group according to Example 3 of the present disclosure is described below with reference to  FIG. 11  to  FIG. 15B .  FIG. 11  illustrates a schematic structural diagram of the optical imaging lens group according to Example 3 of the present disclosure. 
     As shown in  FIG. 11 , the optical imaging lens group from an object side to an image side sequentially includes: an autofocus assembly T (including an optical filter, a liquid material and a flexible film), a diaphragm STO, a first lens E 1 , a second lens E 2 , a third lens E 3 , a fourth lens E 4 , a fifth lens E 5 , a sixth lens E 6  and an imaging plane S 13 . 
     The first lens E 1  has positive refractive power, an object-side surface S 1  of the first lens is a convex surface, and an image-side surface S 2  of the first lens is a convex surface. The second lens E 2  has negative refractive power, an object-side surface S 3  of the second lens is a concave surface, and an image-side surface S 4  of the second lens is a convex surface. The third lens E 3  has negative refractive power, an object-side surface S 5  of the third lens is a convex surface, and an image-side surface S 6  of the third lens is a concave surface. The fourth lens E 4  has negative refractive power, an object-side surface S 7  of the fourth lens is a concave surface, and an image-side surface S 8  of the fourth lens is a convex surface. The fifth lens E 5  has positive refractive power, an object-side surface S 9  of the fifth lens is a convex surface, and an image-side surface S 10  of the fifth lens is a concave surface. The sixth lens E 6  has negative refractive power, an object-side surface S 11  of the sixth lens is a convex surface, and an image-side surface S 12  of the sixth lens is a concave surface. Light from an object sequentially passes through the optical filter to the image-side surface S 12  of the sixth lens E 6  and is finally imaged on the imaging plane S 13 . 
     In this example, a total effective focal length f of the optical imaging lens group is 4.42 mm, a total track length TTL of the optical imaging lens group is 6.12 mm, half of a diagonal length ImgH of an effective pixel area on the imaging plane S 13  of the optical imaging lens group is 3.01 mm, half of a maximum field-of-view Semi-FOV of the optical imaging lens group is 32.9°, and an F number Fno of the optical imaging lens group is 2.47. 
     Table 5 is a table illustrating basic parameters of the optical imaging lens group of Example 3, where the units for the radius of curvature, the thickness/distance and the focal length are millimeter (mm). Table 6 shows high-order coefficients applicable to each aspheric surface in Example 3, where the surface shape of each aspheric surface may be defined by the formula (1) given in the above Example 1. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 5 
               
             
            
               
                   
               
               
                   
                   
                   
                   
                 Material 
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface 
                 Surface 
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe 
                 Focal 
                 Conic 
               
               
                 number 
                 type 
                 curvature 
                 Distance 
                 index 
                 number 
                 length 
                 coefficient 
               
               
                   
               
               
                 OBJ 
                 Spherical 
                 infinite 
                 D1 
                   
                   
                   
                   
               
               
                   
                 Spherical 
                 infinite 
                 0.2100 
                 1.52 
                 64.2 
                   
                   
               
               
                   
                   
                 infinite 
                 0.2650 
                 1.55 
                 29.9 
                   
                   
               
               
                   
                   
                 RT 
                 0.0200 
                 1.53 
                 65.4 
                   
                   
               
               
                   
                   
                   
                 0.5014 
                   
                   
                   
                   
               
               
                 STO 
                 Spherical 
                 infinite 
                 −0.2605 
                   
                   
                   
                   
               
               
                 S1 
                 Aspheric 
                 1.6943 
                 0.6070 
                 1.55 
                 56.1 
                 2.84 
                 −0.6163 
               
               
                 S2 
                 Aspheric 
                 −16.2443 
                 0.1045 
                   
                   
                   
                 −9.6866 
               
               
                 S3 
                 Aspheric 
                 −6.9104 
                 0.5233 
                 1.67 
                 20.4 
                 −12.09 
                 49.5874 
               
               
                 S4 
                 Aspheric 
                 −50.0000 
                 0.2112 
                   
                   
                   
                 90.0000 
               
               
                 S5 
                 Aspheric 
                 19.7104 
                 0.2800 
                 1.67 
                 20.4 
                 −13.95 
                 67.3853 
               
               
                 S6 
                 Aspheric 
                 6.2824 
                 0.2409 
                   
                   
                   
                 32.6353 
               
               
                 S7 
                 Aspheric 
                 −4.9856 
                 0.6938 
                 1.55 
                 56.1 
                 −9.26 
                 −54.3063 
               
               
                 S8 
                 Aspheric 
                 −384.7455 
                 0.0914 
                   
                   
                   
                 90.0000 
               
               
                 S9 
                 Aspheric 
                 3.6915 
                 0.7600 
                 1.55 
                 56.1 
                 6.95 
                 −13.0868 
               
               
                 S10 
                 Aspheric 
                 128.8601 
                 0.3830 
                   
                   
                   
                 90.0000 
               
               
                 S11 
                 Aspheric 
                 7.8096 
                 0.8600 
                 1.54 
                 55.8 
                 −4.88 
                 −5.7874 
               
               
                 S12 
                 Aspheric 
                 1.8852 
                 0.6319 
                   
                   
                   
                 −5.8246 
               
               
                 S13 
                 Spherical 
                 infinite 
                   
                   
                   
                   
                   
               
               
                   
               
            
           
         
       
     
     In this example, the optical filter and the liquid material may be cemented together. By changing the radius of curvature of a flexible film surface of the autofocus assembly T and the radius of curvature of an image-side surface of the liquid material, the total effective focal length of the optical imaging lens group may be changed with the change of a distance from the object, thereby realizing the autofocusing function of the optical imaging lens group. When the distance D 1  between the optical imaging lens group and the object is 350 mm, the image-side surface of the autofocus assembly T is a plane, and the radius of curvature RT is infinite. When the distance D 1  between the optical imaging lens group and the object is 150 mm, the image-side surface of the autofocus assembly T is a concave surface, and the radius of curvature RT is 3.5180. When the distance D 1  between the optical imaging lens group and the object is infinite, the image-side surface of the autofocus assembly T is a convex surface, and the radius of curvature RT is −4.7000. 
     
       
         
           
               
               
               
               
               
               
               
               
               
               
             
               
                 TABLE 6 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 number 
                 A4 
                 A6 
                 A8 
                 A10 
                 A12 
                 A14 
                 A16 
                 A18 
                 A20 
               
               
                   
               
             
            
               
                 S1 
                  9.9766E−03 
                  9.5467E−05 
                 −4.9088E−05  
                 −9.2612E−06  
                 −1.4284E−06 
                  4.5169E−07  
                 −3.4986E−07 
                  1.7643E−47 
                 −1.5095E−08 
               
               
                 S2 
                 −6.3355E−03 
                 −1.5555E−03 
                 −1.9454E−03  
                 −1.6051E−03 
                 −1.0524E−03 
                 −5.5191E−04  
                 −2.1870E−04 
                 −6.1025E−05  
                 −9.2421E−06 
               
               
                 S3 
                  1.5024E−02 
                  3.6118E−03 
                  7.2833E−04 
                  1.8001E−04  
                  5.4475E−05 
                  1.1598E−05  
                  3.7393E−06 
                  1.1575E−06  
                  1.2701E−06 
               
               
                 S4 
                 −5.2579E−02 
                  1.3513E−04 
                 −1.2619E−04  
                 −2.0654E−04  
                 −3.1259E−05 
                 −2.3296E−05  
                 −3.2476E−06 
                 −3.8621E−06  
                 −3.6996E−07 
               
               
                 S5 
                 −1.0684E−01 
                 −8.1279E−06 
                 −2.3982E−04 
                 −9.1154E−04 
                 −1.9885E−04 
                 −1.0017E−04  
                 −3.3820E−05 
                 −1.2130E−05  
                 −3.6355E−06 
               
               
                 S6 
                 −2.3727E−02 
                  5.7420E−03 
                 −2.1741E−03  
                 −2.9342E−03  
                 −1.0357E−03 
                 −5.6596E−04 
                 −1.9176E−04  
                 −5.4997E−05 
                 −1.2527E−05 
               
               
                 S7 
                 −7.0621E−03 
                  1.3126E−02 
                  1.6649E−03 
                  6.0518E−04  
                  2.0486E−04 
                 −1.1995E−04  
                 −6.7238E−05 
                 −1.0231E−05  
                 −4.5147E−06 
               
               
                 S8 
                 −1.1343E−01 
                  4.4988E−02 
                 −2.0875E−02 
                  2.5064E−03  
                  1.6126E−03 
                  7.4863E−05  
                  3.0324E−04 
                  2.5980E−04  
                 −2.9821E−05 
               
               
                 S9 
                 −1.7256E−01  
                  3.6873E−02 
                 −1.2072E−02 
                 −7.5377E−04  
                  3.4774E−04 
                 −4.0428E−05  
                 −2.1172E−04 
                  9.0789E−05  
                 −3.3049E−05 
               
               
                 S10 
                 −1.9169E−01 
                  6.0849E−02 
                 −6.5409E−03  
                 −8.1156E−03 
                 −7.3946E−04 
                  1.7072E−03 
                 −7.2269E−04 
                  1.1961E−04  
                 −6.9227E−05 
               
               
                 S11 
                 −9.5117E−01 
                  3.4769E−01 
                 −7.5196E−02 
                 −1.1849E−02 
                 −2.7502E−03 
                  4.6420E−03  
                 −3.8193E−03 
                 −7.4647E−04 
                  5.0657E−05 
               
               
                 S12 
                 −1.3740E+00 
                  1.5609E−01 
                 −5.4627E−02 
                  3.8671E−02 
                 −6.2934E−03 
                  4.0709E−03 
                 −4.4908E−03 
                 −7.3672E−04 
                 −1.0734E−03 
               
               
                   
               
            
           
         
       
     
       FIG. 12A  illustrates the longitudinal aberration curve of the optical imaging lens group according to Example 3, representing deviations of focal points converged by light of different wavelengths after passing through the lens assembly.  FIG. 12B  illustrates the astigmatic curve of the optical imaging lens group according to Example 3, representing a curvature of a tangential plane and a curvature of a sagittal plane.  FIG. 12C  illustrates the distortion curve of the optical imaging lens group according to Example 3, representing the amounts of distortion corresponding to different image heights.  FIG. 12D  illustrates the lateral color curve of the optical imaging lens group according to Example 3, representing deviations of different image heights on an imaging plane after light passes through the lens assembly.  FIG. 13A ,  FIG. 14A  and  FIG. 15A  respectively illustrate MTF curve diagrams within a waveband range of 430 nm-650 nm of the optical imaging lens group in Example 3, when the distances from the object are 350 mm, 150 mm and infinite respectively, representing the pixel size of a tangential field-of-view and a sagittal field-of-view at different frequencies.  FIG. 13B ,  FIG. 14B  and  FIG. 15B  respectively illustrate focus shift curve diagrams within a waveband range of 430 nm-650 nm of the optical imaging lens group in Example 3, when the distances from the object are 350 mm, 150 mm and infinite respectively, representing the pixel size of a tangential field-of-view and a sagittal field-of-view under different focal shifts. It can be seen from  FIG. 12A  to  FIG. 15B  that the optical imaging lens group provided in Example 3 can achieve good imaging quality. 
     Example 4 
     An optical imaging lens group according to Example 4 of the present disclosure is described below with reference to  FIG. 16  to  FIG. 20B .  FIG. 16  illustrates a schematic structural diagram of the optical imaging lens group according to Example 4 of the present disclosure. 
     As shown in  FIG. 16 , the optical imaging lens group from an object side to an image side sequentially includes: an autofocus assembly T (including an optical filter, a liquid material and a flexible film), a diaphragm STO, a first lens E 1 , a second lens E 2 , a third lens E 3 , a fourth lens E 4 , a fifth lens E 5  and an imaging plane S 11 . 
     The first lens E 1  has positive refractive power, an object-side surface S 1  of the first lens is a convex surface, and an image-side surface S 2  of the first lens is a convex surface. The second lens E 2  has negative refractive power, an object-side surface S 3  of the second lens is a concave surface, and an image-side surface S 4  of the second lens is a convex surface. The third lens E 3  has negative refractive power, an object-side surface S 5  of the third lens is a convex surface, and an image-side surface S 6  of the third lens is a concave surface. The fourth lens E 4  has positive refractive power, an object-side surface S 7  of the fourth lens is a concave surface, and an image-side surface S 8  of the fourth lens is a convex surface. The fifth lens E 5  has negative refractive power, an object-side surface S 9  of the fifth lens is a convex surface, and an image-side surface S 10  of the fifth lens is a concave surface. Light from an object sequentially passes through the optical filter to the image-side surface S 10  of the fifth lens E 5  and is finally imaged on the imaging plane S 11 . 
     In this example, a total effective focal length f of the optical imaging lens group is 4.36 mm, a total track length TTL of the optical imaging lens group (that is, a distance from the object-side surface of the optical filter T 1  to the imaging plane S 11  of the optical imaging lens group on the optical axis) is 6.17 mm, half of a diagonal length ImgH of an effective pixel area on the imaging plane S 11  of the optical imaging lens group is 3.01 mm, half of a maximum field-of-view Semi-FOV of the optical imaging lens group is 33.3°, and an F number Fno of the optical imaging lens group is 2.47. 
     Table 7 is a table illustrating basic parameters of the optical imaging lens group of Example 4, where the units for the radius of curvature, the thickness/distance and the focal length are millimeter (mm). Table 8 shows high-order coefficients applicable to each aspheric surface in Example 4, where the surface shape of each aspheric surface may be defined by the formula 1 given in the above Example 1. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 7 
               
             
            
               
                   
               
               
                   
                   
                   
                   
                 Material 
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface 
                 Surface 
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe  
                 Focal 
                 Conic 
               
               
                 number 
                 type 
                 curvature 
                 Distance 
                 index 
                 number 
                 length 
                 coefficient 
               
               
                   
               
               
                 OBJ 
                 Spherical 
                 infinite 
                 D1 
                   
                   
                   
                   
               
               
                   
                 Spherical 
                 infinite 
                 0.2100 
                 1.52 
                 64.2 
                   
                   
               
               
                   
                   
                 infinite 
                 0.2650 
                 1.55 
                 29.9 
                   
                   
               
               
                   
                   
                 RT 
                 0.0200 
                 1.53 
                 65.4 
                   
                   
               
               
                   
                   
                   
                 0.5014 
                   
                   
                   
                   
               
               
                 STO 
                 Spherical 
                 infinite 
                 −0.2600 
                   
                   
                   
                   
               
               
                 S1 
                 Aspheric 
                 1.6467  
                 0.6002 
                 1.55 
                 56.1 
                 2.81 
                 −0.5657 
               
               
                 S2 
                 Aspheric 
                 −20.0290 
                 0.1069 
                   
                   
                   
                 −90.0000 
               
               
                 S3 
                 Aspheric 
                 −4.8061 
                 0.2959 
                 1.67 
                 20.4 
                 −8.63 
                 −24.7560 
               
               
                 S4 
                 Aspheric 
                 −30.0000 
                 0.4202 
                   
                   
                   
                 90.0000 
               
               
                 S5 
                 Aspheric 
                 15.9716 
                 0.3072 
                 1.67 
                 20.4 
                 −15.90 
                 90.0000 
               
               
                 S6 
                 Aspheric 
                 6.3211 
                 0.1521 
                   
                   
                   
                 −4.2959 
               
               
                 S7 
                 Aspheric 
                 −6.8701 
                 1.6940 
                 1.55 
                 56.1 
                 5.38 
                 −90.0000 
               
               
                 S8 
                 Aspheric 
                 −2.2369  
                 0.4609 
                   
                   
                   
                 −6.8222 
               
               
                 S9 
                 Aspheric 
                 7.2189 
                 0.6161 
                 1.54 
                 55.8 
                 −3.37 
                 −9.3307 
               
               
                 S10 
                 Aspheric 
                 1.4028 
                 0.7801 
                   
                   
                   
                 −4.7569 
               
               
                 S11 
                 Spherical 
                 infinite 
                   
                   
                   
                   
                   
               
               
                   
               
            
           
         
       
     
     In this example, the optical filter and the liquid material may be cemented together. By changing the radius of curvature of a flexible film surface of the autofocus assembly T and the radius of curvature of an image-side surface of the liquid material, the total effective focal length of the optical imaging lens group may be changed with the change of a distance from the object, thereby realizing the autofocusing function of the optical imaging lens group. When the distance D 1  between the optical imaging lens group and the object is 350 mm, the image-side surface of the autofocus assembly T is a plane, and the radius of curvature RT is infinite. When the distance D 1  between the optical imaging lens group and the object is 150 mm, the image-side surface of the autofocus assembly T is a concave surface, and the radius of curvature RT is 3.5050. When the distance D 1  between the optical imaging lens group and the object is infinite, the image-side surface of the autofocus assembly T is a convex surface, and the radius of curvature RT is −4.7150. 
     
       
         
           
               
               
               
               
               
               
               
               
               
               
             
               
                 TABLE 8 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 number 
                 A4 
                 A6 
                 A8 
                 A10 
                 A12 
                 A14 
                 A16 
                 A18 
                 A20 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 S1 
                  1.0907E−02 
                 −2.2412E−04 
                 −1.6837E−04 
                 −3.6577E−05 
                 −5.0834E−06 
                 −5.0391E−07 
                  3.7614E−09 
                  4.2097E−08 
                 −1.0675E−08 
               
               
                 S2 
                 −3.6535E−03 
                 −3.2260E−04  
                 −3.2132E−04 
                 −1.6471E−05 
                 −1.2138E−04 
                 −8.1696E−05  
                 −3.2769E−05 
                 −7.1535E−06 
                  7.7555E−08 
               
               
                 S3 
                  3.7921E−03 
                  2.5726E−03 
                 −1.3414E−04 
                  1.1389E−04  
                 −1.0646E−04 
                 −6.4163E−05  
                 −3.0029E−05 
                 −9.2995E−06 
                 −1.6600E−06 
               
               
                 S4 
                 −7.2603E−03 
                  3.1495E−04 
                 −3.8203E−04 
                  5.0565E−05  
                 −2.1726E−05 
                 −4.7425E−06  
                 −2.7897E−06 
                 −4.8042E−07 
                 −6.5213E−07 
               
               
                 S5 
                 −1.3010E−01 
                  2.3882E−03 
                 −6.3214E−04  
                 −5.3113E−05 
                 −6.1863E−05 
                 −1.9156E−05 
                 −1.3484E−05  
                 −3.6461E−06 
                 −1.6678E−06 
               
               
                 S6 
                 −1.0634E−01  
                  1.8342E−02 
                  9.9273E−04 
                  3.3995E−04 
                  2.9382E−05 
                  9.3539E−06  
                 −1.3419E−05 
                 −5.6644E−06 
                 −1.9520E−06 
               
               
                 S7 
                 −7.0677E−02 
                  1.1320E−02 
                  9.9246E−04 
                  6.5629E−04  
                  1.9069E−04 
                 −3.7528E−06 
                 −6.3136E−05 
                 −3.2552E−05 
                 −9.8428E−06 
               
               
                 S8 
                 −9.1719E−03 
                  3.7445E−02 
                 −1.3878E−02 
                  1.6731E−03  
                 −5.8103E−04 
                  2.5193E−04 
                 −6.9311E−05  
                  6.1701E−06 
                  5.6877E−07 
               
               
                 S9 
                 −8.1295E−01 
                  2.6531E−01 
                 −1.0474E−01 
                  2.4538E−02  
                 −1.1802E−02  
                  3.6528E−03 
                 −1.8184E−03 
                  5.6450E−04 
                 −1.6619E−04 
               
               
                 S10 
                 −8.8334E−01 
                  1.5869E−01 
                 −7.1378E−02 
                  2.2588E−02  
                 −1.1191E−02  
                  4.3254E−03 
                 −2.0077E−03  
                  7.1033E−04 
                 −3.0007E−04 
               
               
                   
               
            
           
         
       
     
       FIG. 17A  illustrates the longitudinal aberration curve of the optical imaging lens group according to Example 4, representing deviations of focal points converged by light of different wavelengths after passing through the lens assembly.  FIG. 17B  illustrates the astigmatic curve of the optical imaging lens group according to Example 4, representing a curvature of a tangential plane and a curvature of a sagittal plane.  FIG. 17C  illustrates the distortion curve of the optical imaging lens group according to Example 4, representing the amounts of distortion corresponding to different image heights.  FIG. 17D  illustrates the lateral color curve of the optical imaging lens group according to Example 4, representing deviations of different image heights on an imaging plane after light passes through the lens assembly.  FIG. 18A ,  FIG. 19A  and  FIG. 20A  respectively illustrate MTF curve diagrams within a waveband range of 430 nm-650 nm of the optical imaging lens group in Example 4, when the distances from the object are 350 mm, 150 mm and infinite respectively, representing the pixel size of a tangential field-of-view and a sagittal field-of-view at different frequencies.  FIG. 18B ,  FIG. 19B  and  FIG. 20B  respectively illustrate focus shift curve diagrams within a waveband range of 430 nm-650 nm of the optical imaging lens group in Example 4, when the distances from the object are 350 mm, 150 mm and infinite respectively, representing the pixel size of a tangential field-of-view and a sagittal field-of-view under different focal shifts. It can be seen from  FIG. 17A  to  FIG. 20B  that the optical imaging lens group provided in Example 4 can achieve good imaging quality. 
     Example 5 
     An optical imaging lens group according to Example 5 of the present disclosure is described below with reference to  FIG. 21  to  FIG. 25B .  FIG. 21  illustrates a schematic structural diagram of the optical imaging lens group according to Example 5 of the present disclosure. 
     As shown in  FIG. 21 , the optical imaging lens group from an object side to an image side sequentially includes: an autofocus assembly T (including an optical filter, a liquid material and a flexible film), a diaphragm STO, a first lens E 1 , a second lens E 2 , a third lens E 3 , a fourth lens E 4 , a fifth lens E 5  and an imaging plane S 11 . 
     The first lens E 1  has positive refractive power, an object-side surface S 1  of the first lens is a convex surface, and an image-side surface S 2  of the first lens is a convex surface. The second lens E 2  has negative refractive power, an object-side surface S 3  of the second lens is a concave surface, and an image-side surface S 4  of the second lens is a concave surface. The third lens E 3  has negative refractive power, an object-side surface S 5  of the third lens is a convex surface, and an image-side surface S 6  of the third lens is a concave surface. The fourth lens E 4  has positive refractive power, an object-side surface S 7  of the fourth lens is a concave surface, and an image-side surface S 8  of the fourth lens is a convex surface. The fifth lens E 5  has negative refractive power, an object-side surface S 9  of the fifth lens is a convex surface, and an image-side surface S 10  of the fifth lens is a concave surface. Light from an object sequentially passes through the optical filter to the image-side surface S 10  of the fifth lens E 5  and is finally imaged on the imaging plane S 11 . 
     In this example, a total effective focal length f of the optical imaging lens group is 4.32 mm, a total track length TTL of the optical imaging lens group is 6.04 mm, half of a diagonal length ImgH of an effective pixel area on the imaging plane S 11  of the optical imaging lens group is 3.01 mm, half of a maximum field-of-view Semi-FOV of the optical imaging lens group is 33.5°, and an F number Fno of the optical imaging lens group is 2.47. 
     Table 9 is a table illustrating basic parameters of the optical imaging lens group of Example 5, where the units for the radius of curvature, the thickness/distance and the focal length are millimeter (mm). Table 10 shows high-order coefficients applicable to each aspheric surface in Example 5, where the surface shape of each aspheric surface may be defined by the formula (1) given in the above Example 1. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 9 
               
             
            
               
                   
               
               
                   
                   
                   
                   
                 Material 
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface 
                 Surface 
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe  
                 Focal 
                 Conic 
               
               
                 number 
                 type 
                 curvature 
                 Distance 
                 index 
                 number 
                 length 
                 coefficient 
               
               
                   
               
               
                 OBJ 
                 Spherical 
                 infinite 
                 D1 
                   
                   
                   
                   
               
               
                   
                 Spherical 
                 infinite 
                 0.2100 
                 1.52 
                 64.2 
                   
                   
               
               
                   
                   
                 infinite 
                 0.2650 
                 1.55 
                 29.9 
                   
                   
               
               
                   
                   
                 RT 
                 0.0200 
                 1.53 
                 65.4 
                   
                   
               
               
                   
                   
                   
                 0.5214 
                   
                   
                   
                   
               
               
                 STO 
                 Spherical 
                 infinite 
                 −0.2542 
                   
                   
                   
                   
               
               
                 S1 
                 Aspheric 
                 1.6074 
                 0.7125 
                 1.55 
                 56.1 
                 2.85 
                 −0.6040 
               
               
                 S2 
                 Aspheric 
                 −40.2450  
                 0.0457 
                   
                   
                   
                 −86.2329 
               
               
                 S3 
                 Aspheric 
                 −35.1553  
                 0.2981 
                 1.67 
                 20.4 
                 −6.71 
                 90.0000 
               
               
                 S4 
                 Aspheric 
                 5.1398 
                 0.4151 
                   
                   
                   
                 −41.0033 
               
               
                 S5 
                 Aspheric 
                 8.7565 
                 0.3101 
                 1.67 
                 20.4 
                 −26.71 
                 68.7842 
               
               
                 S6 
                 Aspheric 
                 5.7860 
                 0.1800 
                   
                   
                   
                 −38.6127 
               
               
                 S7 
                 Aspheric 
                 −4.1289 
                 1.0000 
                 1.55 
                 56.1 
                 10.49 
                 −40.7434 
               
               
                 S8 
                 Aspheric 
                 −2.6041 
                 0.5568 
                   
                   
                   
                 −5.5496 
               
               
                 S9 
                 Aspheric 
                 4.3569 
                 0.9943 
                 1.54 
                 55.8 
                 −5.84 
                 −7.8878 
               
               
                 S10 
                 Aspheric 
                 1.6782 
                 0.7824 
                   
                   
                   
                 −4.8223 
               
               
                 S11 
                 Spherical 
                 infinite 
                   
                   
                   
                   
                   
               
               
                   
               
            
           
         
       
     
     In this example, the optical filter and the liquid material may be cemented together. By changing the radius of curvature of a flexible film surface of the autofocus assembly T and the radius of curvature of an image-side surface of the liquid material, the total effective focal length of the optical imaging lens group may be changed with the change of a distance from the object, thereby realizing the autofocusing function of the optical imaging lens group. When the distance D 1  between the optical imaging lens group and the object is 350 mm, the image-side surface of the autofocus assembly T is a plane, and the radius of curvature RT is infinite. When the distance D 1  between the optical imaging lens group and the object is 150 mm, the image-side surface of the autofocus assembly T is a concave surface, and the radius of curvature RT is 3.4900. When the distance D 1  between the optical imaging lens group and the object is infinite, the image-side surface of the autofocus assembly T is a convex surface, and the radius of curvature RT is −4.7400. 
     
       
         
           
               
               
               
               
               
               
               
               
               
               
             
               
                 TABLE 10 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 number 
                 A4 
                 A6 
                 A8 
                 A10 
                 A12 
                 A14 
                 A16 
                 A18 
                 A20 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 S1 
                  1.0090E−02  
                 −3.6167E−04  
                 −1.7005E−04 
                 −3.3561E−05 
                 −5.0109E−06 
                 −9.0343E−07 
                 −4.9707E−08 
                  1.0708E−07  
                 −2.0308E−08 
               
               
                 S2 
                 −6.2499E−03  
                 −2.5262E−04 
                 −6.6909E−04 
                  1.7185E−04 
                 −3.3181E−05 
                  3.2573E−06  
                  3.8087E−06 
                  3.0262E−06 
                  8.1315E−07 
               
               
                 S3 
                  1.0243E−02  
                  3.2819E−03 
                 −3.2089E−04 
                  2.5385E−04  
                 −3.6305E−05 
                  1.7849E−06  
                  1.7578E−06 
                  1.7039E−06  
                  7.6696E−07 
               
               
                 S4 
                  1.7109E−02  
                  2.1672E−03 
                  1.2067E−04 
                  1.3256E−04  
                 −1.9285E−05 
                 −3.6781E−06  
                 −2.5115E−06 
                 −4.3294E−07 
                 −5.3613E−07 
               
               
                 S5 
                 −1.3754E−01 
                 −2.2867E−03  
                 −3.1903E−04 
                  1.3656E−04 
                 −2.4999E−05 
                 −7.4614E−06  
                 −1.3341E−05  
                 −3.2317E−06 
                 −2.2383E−06 
               
               
                 S6 
                 −1.2354E−01 
                  1.4348E−02 
                  1.9148E−03 
                  6.4894E−04  
                  7.0004E−05 
                  4.0825E−05  
                 −2.1631E−05 
                 −1.0531E−05  
                 −4.4911E−06 
               
               
                 S7 
                 −8.4696E−02 
                  1.4425E−02 
                 −1.4191E−03 
                  9.1645E−05  
                  5.6724E−05 
                  8.0676E−05  
                  2.9725E−06 
                 −3.2164E−06  
                 −3.8107E−06 
               
               
                 S8 
                 −2.9584E−02 
                  4.9493E−02 
                 −1.9951E−02 
                  1.1629E−03  
                  4.2545E−04 
                  1.2357E−04  
                 −1.6430E−04 
                  2.2638E−06 
                  7.8958E−06 
               
               
                 S9 
                 −7.0542E−01 
                  2.6406E−01 
                 −9.6432E−02  
                  2.8900E−02 
                 −8.8125E−03 
                  2.1854E−03  
                 −7.0726E−04 
                  1.5403E−04  
                 −3.4764E−05 
               
               
                 S10 
                 −9.6836E−01 
                  1.5622E−01 
                 −8.4658E−02 
                  1.7526E−02  
                 −9.7556E−03 
                  3.2183E−03 
                 −1.0254E−03 
                  4.0427E−04 
                 −1.5206E−04 
               
               
                   
               
            
           
         
       
     
       FIG. 22A  illustrates the longitudinal aberration curve of the optical imaging lens group according to Example 5, representing deviations of focal points converged by light of different wavelengths after passing through the lens assembly.  FIG. 22B  illustrates the astigmatic curve of the optical imaging lens group according to Example 5, representing a curvature of a tangential plane and a curvature of a sagittal plane.  FIG. 22C  illustrates the distortion curve of the optical imaging lens group according to Example 5, representing the amounts of distortion corresponding to different image heights.  FIG. 22D  illustrates the lateral color curve of the optical imaging lens group according to Example 5, representing deviations of different image heights on an imaging plane after light passes through the lens assembly.  FIG. 23A ,  FIG. 24A  and  FIG. 25A  respectively illustrate MTF curve diagrams within a waveband range of 430 nm-650 nm of the optical imaging lens group in Example 5, when the distances from the object are 350 mm, 150 mm and infinite respectively, representing the pixel size of a tangential field-of-view and a sagittal field-of-view at different frequencies.  FIG. 23B ,  FIG. 24B  and  FIG. 25B  respectively illustrate focus shift curve diagrams within a waveband range of 430 nm-650 of the optical imaging lens group in Example 5, when the distances from the object are 350 mm, 150 mm and infinite respectively, representing the pixel size of a tangential field-of-view and a sagittal field-of-view under different focal shifts. It can be seen from  FIG. 22A  to  FIG. 25B  that the optical imaging lens group provided in Example 5 can achieve good imaging quality. 
     Example 6 
     An optical imaging lens group according to Example 6 of the present disclosure is described below with reference to  FIG. 26  to  FIG. 30B .  FIG. 26  illustrates a schematic structural diagram of the optical imaging lens group according to Example 6 of the present disclosure. 
     As shown in  FIG. 26 , the optical imaging lens group from an object side to an image side sequentially includes: an autofocus assembly T (including an optical filter, a liquid material and a flexible film), a diaphragm STO, a first lens E 1 , a second lens E 2 , a third lens E 3 , a fourth lens E 4 , a fifth lens E 5  and an imaging plane S 11 . 
     The first lens E 1  has positive refractive power, an object-side surface S 1  of the first lens is a convex surface, and an image-side surface S 2  of the first lens is a convex surface. The second lens E 2  has negative refractive power, an object-side surface S 3  of the second lens is a concave surface, and an image-side surface S 4  of the second lens is a concave surface. The third lens E 3  has negative refractive power, an object-side surface S 5  of the third lens is a concave surface, and an image-side surface S 6  of the third lens is a concave surface. The fourth lens E 4  has positive refractive power, an object-side surface S 7  of the fourth lens is a convex surface, and an image-side surface S 8  of the fourth lens is a convex surface. The fifth lens E 5  has negative refractive power, an object-side surface S 9  of the fifth lens is a convex surface, and an image-side surface S 10  of the fifth lens is a concave surface. Light from an object sequentially passes through the optical filter to the image-side surface S 10  of the fifth lens E 5  and is finally imaged on the imaging plane S 11 . 
     In this example, a total effective focal length f of the optical imaging lens group is 4.32 mm, a total track length TTL of the optical imaging lens group is 6.17 mm, half of a diagonal length ImgH of an effective pixel area on the imaging plane S 11  of the optical imaging lens group is 3.01 mm, half of a maximum field-of-view Semi-FOV of the optical imaging lens group is 33.6°, and an F number Fno of the optical imaging lens group is 2.47. 
     Table 11 is a table illustrating basic parameters of the optical imaging lens group of Example 6, where the units for the radius of curvature, the thickness/distance and the focal length are millimeter (mm). Table 12 shows high-order coefficients applicable to each aspheric surface in Example 6, where the surface shape of each aspheric surface may be defined by the formula (1) given in the above Example 1. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 11 
               
             
            
               
                   
               
               
                   
                   
                   
                   
                 Material 
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface 
                 Surface 
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe  
                 Focal 
                 Conic 
               
               
                 number 
                 type 
                 curvature 
                 Distance 
                 index 
                 number  
                 length 
                 coefficient 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 OBJ 
                 Spherical 
                 infinite 
                 D1 
                   
                   
                   
                   
               
               
                   
                 Spherical 
                 infinite 
                 0.2100 
                 1.52 
                 64.2 
                   
                   
               
               
                   
                   
                 infinite 
                 0.2650 
                 1.55 
                 29.9 
                   
                   
               
               
                   
                   
                 RT 
                 0.0200 
                 1.53 
                 65.4 
                   
                   
               
               
                   
                   
                   
                 0.5014 
                   
                   
                   
                   
               
               
                 STO 
                 Spherical 
                 infinite 
                 −0.2454 
                   
                   
                   
                   
               
               
                 S1 
                 Aspheric 
                 1.7282 
                 0.8000 
                 1.55 
                 56.1  
                 3.08 
                 −0.5471 
               
               
                 S2 
                 Aspheric 
                 −50.0000 
                 0.1224 
                   
                   
                   
                 −90.0000 
               
               
                 S3 
                 Aspheric 
                 −42.4316  
                 0.2615 
                 1.67 
                 20.4  
                 −6.12 
                 −90.0000 
               
               
                 S4 
                 Aspheric 
                 4.5233 
                 0.3385 
                   
                   
                   
                 −42.2362 
               
               
                 S5 
                 Aspheric 
                 −37.1114 
                 0.5352 
                 1.67 
                 20.4  
                 −22.04 
                 −90.0000 
               
               
                 S6 
                 Aspheric 
                 24.4490 
                 0.2000 
                   
                   
                   
                 90.0000 
               
               
                 S7 
                 Aspheric 
                 40.0000 
                 1.0000 
                 1.55 
                 56.1  
                 5.65 
                 −90.0000 
               
               
                 S8 
                 Aspheric 
                 −3.3106 
                 0.6132 
                   
                   
                   
                 −9.8607 
               
               
                 S9 
                 Aspheric 
                 5.9191 
                 0.8300 
                 1.54 
                 55.8  
                 −4.05 
                 −34.0991 
               
               
                 S10 
                 Aspheric 
                 1.5115 
                 0.7182 
                   
                   
                   
                 −5.0098 
               
               
                 S11 
                 Spherical 
                 infinite 
                   
                   
                   
                   
                   
               
               
                   
               
            
           
         
       
     
     In this example, the optical filter and the liquid material may be glued together. By changing the radius of curvature of a flexible film surface of the autofocus assembly T and the radius of curvature of an image-side surface of the liquid material, the total effective focal length of the optical imaging lens group may be changed with the change of a distance from the object, thereby realizing the autofocusing function of the optical imaging lens group. When the distance D 1  between the optical imaging lens group and the object is 350 mm, the image-side surface of the autofocus assembly T is a plane, and the radius of curvature RT is infinite. When the distance D 1  between the optical imaging lens group and the object is 150 mm, the image-side surface of the autofocus assembly T is a concave surface, and the radius of curvature RT is 3.4940. When the distance D 1  between the optical imaging lens group and the object is infinite, the image-side surface of the autofocus assembly T is a convex surface, and the radius of curvature RT is −4.7350. 
     
       
         
           
               
               
               
               
               
               
               
               
               
               
             
               
                 TABLE 12 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 number 
                 A4 
                 A6 
                 A8 
                 A10 
                 A12 
                 A14 
                 A16 
                 A18 
                 A20 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 S1 
                  1.1114E−02 
                  4.3631E−04 
                  8.5437E−06 
                 −1.2169E−06  
                  5.7589E−07 
                 −3.1064E−07 
                 −1.1454E−07 
                 −9.2960E−08 
                  6.1804E−08 
               
               
                 S2 
                  1.5140E−02 
                 −2.6299E−03 
                 −8.7383E−04  
                 −1.9044E−04 
                  1.0766E−04 
                  2.8461E−04 
                  1.5349E−04  
                  4.0934E−05 
                  2.2320E−06 
               
               
                 S3 
                  4.0795E−03 
                  2.0500E−03 
                  1.5840E−04 
                  1.9467E−04  
                 −6.2310E−05 
                 −1.6441E−05  
                 −3.4727E−06 
                  2.1913E−06 
                  1.4434E−06 
               
               
                 S4 
                  1.3378E−02 
                  5.0634E−03 
                  3.7607E−04 
                 −1.5412E−03  
                 −3.0557E−04 
                  9.6257E−04 
                  8.0176E−04 
                  3.1928E−04 
                  5.7178E−05 
               
               
                 S5 
                 −1.1696E−01  
                 −1.3863E−03 
                 −1.2493E−04 
                  3.6307E−04 
                  5.0650E−05 
                 −1.2026E−06 
                 −2.0209E−05 
                 −5.2394E−06 
                 −2.5678E−06 
               
               
                 S6 
                 −1.0606E−01 
                  1.4576E−02 
                 −5.8702E−04 
                  4.3059E−04  
                 −2.3199E−05 
                  3.7069E−05  
                 −1.6244E−05 
                  3.4521E−06 
                 −7.7561E−07 
               
               
                 S7 
                 −3.9889E−02 
                  1.5708E−02 
                 −3.0124E−03 
                  1.8477E−04 
                 −4.1415E−05 
                  5.0469E−05 
                 −2.1667E−05 
                  4.5325E−06 
                 −4.0680E−07 
               
               
                 S8 
                 −1.2830E−02 
                  5.5171E−02 
                 −1.7749E−02  
                  4.0492E−05  
                 −1.8286E−04 
                  3.9021E−04  
                 −1.1077E−04 
                 −4.3547E−06 
                  4.0046E−06 
               
               
                 S9 
                 −1.1312E+00 
                  2.2683E−01 
                 −1.6012E−01 
                  9.9672E−03  
                  2.0193E−03 
                  1.2397E−02 
                  4.8306E−03 
                  2.8267E−03 
                  5.2410E−04 
               
               
                 S10 
                 −8.9821E−01 
                  1.3654E−01 
                 −6.1664E−02 
                  1.7585E−02  
                 −7.7842E−03 
                  2.9398E−03  
                 −1.1816E−03 
                  3.7272E−04 
                 −1.5750E−04 
               
               
                   
               
            
           
         
       
     
       FIG. 27A  illustrates the longitudinal aberration curve of the optical imaging lens group according to Example 6, representing deviations of focal points converged by light of different wavelengths after passing through the lens assembly.  FIG. 27B  illustrates the astigmatic curve of the optical imaging lens group according to Example 6, representing a curvature of a tangential plane and a curvature of a sagittal plane.  FIG. 27C  illustrates the distortion curve of the optical imaging lens group according to Example 6, representing the amounts of distortion corresponding to different image heights.  FIG. 27D  illustrates the lateral color curve of the optical imaging lens group according to Example 6, representing deviations of different image heights on an imaging plane after light passes through the lens assembly.  FIG. 28A ,  FIG. 29A  and  FIG. 30A  respectively illustrate MTF curve diagrams within a waveband range of 430 nm-650 nm of the optical imaging lens group in Example 6, when the distances from the object are 350 mm, 150 mm and infinite respectively, representing the pixel size of a tangential field-of-view and a sagittal field-of-view at different frequencies.  FIG. 28B ,  FIG. 29B  and  FIG. 30B  respectively illustrate focus shift curve diagrams within a waveband range of 430 nm-650 nm of the optical imaging lens group in Example 6, when the distances from the object are 350 mm, 150 mm and infinite respectively, representing the pixel size of a tangential field-of-view and a sagittal field-of-view under different focal shifts. It can be seen from  FIG. 27A  to  FIG. 30B  that the optical imaging lens group provided in Example 6 can achieve good imaging quality. 
     In view of the above, examples 1 to 6 respectively satisfy the relationship shown in Table 13. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 13 
               
               
                   
               
               
                 Conditional/ 
                   
                   
                   
                   
                   
                   
               
               
                 Example 
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 |R5/R6| 
                 1.61 
                 1.68 
                 3.14 
                 2.53 
                 1.51 
                 1.52 
               
               
                 (R2/10)/R1 
                 −3.06 
                 −3.48 
                 −0.96 
                 −1.22 
                 −2.50 
                 −2.89 
               
               
                 CT4/CT1 
                 1.42 
                 1.51 
                 1.14 
                 2.82 
                 1.40 
                 1.25 
               
               
                 CT5/CT3 
                 1.76 
                 2.68 
                 2.71 
                 2.01 
                 3.21 
                 1.55 
               
               
                 T23/T12 
                 9.17 
                 6.15 
                 2.02 
                 3.93 
                 9.09 
                 2.77 
               
               
                 f2/f 
                 −1.65 
                 −1.68 
                 −2.73 
                 −1.98 
                 −1.55 
                 −1.42 
               
               
                 f3/f 
                 −5.21 
                 −4.54 
                 −3.16 
                 −3.64 
                 −6.18 
                 −5.10 
               
               
                 TTL/ImgH 
                 2.03 
                 2.02 
                 2.03 
                 2.05 
                 2.01 
                 2.05 
               
               
                 BFL/D 
                 0.94 
                 0.73 
                 0.79 
                 0.98 
                 0.98 
                 0.90 
               
               
                   
               
            
           
         
       
     
     The present disclosure further provides an imaging apparatus, having an electronic photosensitive element, which may be a photosensitive Charge-Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS). The imaging apparatus may be an independent imaging device such as a digital camera, or may be an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging apparatus is equipped with the optical imaging lens group described above. 
     The foregoing is only a description of the preferred examples of the present disclosure and the applied technical principles. It should be appreciated by those skilled in the art that the inventive scope of the present disclosure is not limited to the technical solutions formed by the particular combinations of the above technical features. The inventive scope should also cover other technical solutions formed by any combinations of the above technical features or equivalent features thereof without departing from the concept of the invention, such as, technical solutions formed by replacing the features as disclosed in the present disclosure with (but not limited to), technical features with similar functions.