Patent Publication Number: US-2023161138-A1

Title: Imaging lens system

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit under 35 USC 119(a) of Korean Patent Application No. 10-2021-0164504 filed on Nov. 25, 2021, in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. 
     BACKGROUND 
     1. Field 
     This application relates to an imaging lens system mountable on a rear camera of a vehicle and a camera for autonomous driving of a vehicle. 
     2. Description of Related Art 
     Vehicles produced recently may include a camera intended to reduce damages to persons and property caused by traffic accidents. For example, one or more cameras may be installed on front and rear bumpers of a vehicle to provide a driver with information on objects located on the front and rear sides of the vehicle. A vehicle camera may require a high-resolution performance as it is important for a vehicle camera to recognize objects around a vehicle and to provide the recognized information to a driver. However, it may be difficult for a vehicle camera to implement a high resolution due to a limitation in an installation space. For example, to implement a vehicle camera having a small f-number, i.e., a large aperture, it may be necessary to increase diameters of a front lens and other lenses, but due to structural and design limitations of vehicle components (e.g., a bumper) in which a camera is installed, it may be difficult to arbitrarily change sizes of the lenses. 
     SUMMARY 
     This Summary is provided to introduce a selection of concepts in simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. 
     In one general aspect, an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed in ascending numerical order along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging plane of the imaging lens system, wherein the imaging lens system satisfies the conditional expressions 0.13&lt;ImgH/TTL&lt;0.16 and 5.3&lt;TTL/f&lt;5.5, where ImgH is a maximum effective image height on the imaging plane, TTL is a distance along the optical axis from an object side of the first lens to the imaging plane, and f is a focal length of the imaging lens system. 
     The second lens may have a concave object-side surface in a paraxial region thereof. 
     The fourth lens may have a convex image-side surface in a paraxial region thereof. 
     The sixth lens may have a concave object-side surface in a paraxial region thereof. 
     The seventh lens may have a convex image-side surface in a paraxial region thereof. 
     The second lens may have a negative refractive power. 
     The fourth lens may have a positive refractive power. 
     The sixth lens may have a negative refractive power. 
     The imaging lens system may the conditional expression 0.49≤|f/f3|&lt;0.6, where f3 is a focal length of the third lens. 
     In another general aspect, an imaging lens system includes a first lens having a negative refractive power; a second lens having a negative refractive power; a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a refractive power; a sixth lens having a refractive power; and a seventh lens having a refractive power, wherein the first to seventh lenses are sequentially disposed in ascending numerical order along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging plane of the imaging lens system, and the imaging lens system satisfies the conditional expression 5.3&lt;TTL/f&lt;5.5, where TTL is a distance along the optical axis from an object side of the first lens to the imaging plane, and f is a focal length of the imaging lens system. 
     The seventh lens may have a convex image-side surface in a paraxial region thereof. 
     The seventh lens may have an image-side surface having an inflection point. 
     The imaging lens system may satisfy the conditional expression 0.03&lt;D34/D12&lt;0.20, where D12 is a distance along the optical axis from an image-side surface of the first lens to an object-side surface of the second lens, and D34 is a distance along the optical axis from an image-side surface of the third lens to an object-side surface of the fourth lens. 
     The imaging lens system may satisfy the conditional expression 0.60&lt;D34/D45&lt;3.0, where D34 is a distance along the optical axis from an image-side surface of the third lens to an object-side surface of the fourth lens, and D45 is a distance along the optical axis from an image-side surface of the fourth lens to an object-side surface of the fifth lens. 
     The imaging lens system may satisfy the conditional expression 2.8&lt;(R6+R7)/(R6-R7)&lt;5.8, where R6 is a radius of curvature of an image-side surface of the third lens at the optical axis, and R7 is a radius of curvature of an object-side surface of the fourth lens at the optical axis. 
     The imaging lens system may satisfy the conditional expression −0.10&lt;(R8+R9)/(R8−R9)&lt;0.3, where R8 is a radius of curvature of an image-side surface of the fourth lens at the optical axis, and R9 is a radius of curvature of an object-side surface of the fifth lens at the optical axis. 
     Other features and aspects will be apparent from the following detailed description, the drawings, and the claims. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a diagram illustrating a first embodiment of an imaging lens system. 
         FIG.  2    is aberration curves of the imaging lens system illustrated in  FIG.  1   . 
         FIG.  3    is a diagram illustrating a second embodiment of an imaging lens system. 
         FIG.  4    is aberration curves of the imaging lens system illustrated in  FIG.  3   . 
         FIG.  5    is a diagram illustrating a third embodiment of an imaging lens system. 
         FIG.  6    is aberration curves of the imaging lens system illustrated in  FIG.  5   . 
         FIG.  7    is a diagram illustrating a fourth embodiment of an imaging lens system. 
         FIG.  8    is aberration curves of the imaging lens system illustrated in  FIG.  7   . 
         FIG.  9    is a diagram illustrating a fifth embodiment of an imaging lens system. 
         FIG.  10    is aberration curves of the imaging lens system illustrated in  FIG.  9   . 
         FIG.  11    is a diagram illustrating a sixth embodiment of an imaging lens system. 
         FIG.  12    is aberration curves of the imaging lens system illustrated in  FIG.  11   . 
         FIG.  13    is a diagram illustrating a seventh embodiment of an imaging lens system. 
         FIG.  14    is aberration curves of the imaging lens system illustrated in  FIG.  13   . 
         FIG.  15    is a diagram illustrating an eighth embodiment of an imaging lens system. 
         FIG.  16    is aberration curves of the imaging lens system illustrated in  FIG.  15   . 
         FIG.  17    is a diagram illustrating a ninth embodiment of an imaging lens system. 
         FIG.  18    is aberration curves of the imaging lens system illustrated in  FIG.  17   . 
         FIG.  19    is a diagram illustrating a tenth embodiment of an imaging lens system. 
         FIG.  20    is aberration curves of the imaging lens system illustrated in  FIG.  19   . 
     
    
    
     Throughout the drawings and the detailed description, the same reference numerals refer to the same elements. The drawings may not be to scale, and the relative size, proportions, and depiction of elements in the drawings may be exaggerated for clarity, illustration, and convenience. 
     DETAILED DESCRIPTION 
     The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the disclosure of this application. For example, the sequences of operations described herein are merely examples, and are not limited to those set forth herein, but may be changed as will be apparent after an understanding of the disclosure of this application, with the exception of operations necessarily occurring in a certain order. Also, descriptions of features that are known in the art may be omitted for increased clarity and conciseness. 
     The features described herein may be embodied in different forms, and are not to be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways of implementing the methods, apparatuses, and/or systems described herein that will be apparent after an understanding of the disclosure of this application. 
     Use herein of the word “may” in describing the various examples, e.g., as to what an example may include or implement, means that at least one example exists in which such a feature is included or implemented, but not all examples are limited thereto. 
     Throughout the specification, when an element, such as a layer, region, or substrate, is described as being “on,” “connected to,” or “coupled to” another element, it may be directly “on,” “connected to,” or “coupled to” the other element, or there may be one or more other elements intervening therebetween. In contrast, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there can be no other elements intervening therebetween. 
     As used herein, the term “and/or” includes any one and any combination of any two or more of the associated listed items. 
     Although terms such as “first,” “second,” and “third” may be used herein to describe various members, components, regions, layers, or sections, these members, components, regions, layers, or sections are not to be limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or section from another member, component, region, layer, or section. Thus, a first member, component, region, layer, or section referred to in examples described herein may also be referred to as a second member, component, region, layer, or section without departing from the teachings of the examples. 
     Spatially relative terms such as “above,” “upper,” “below,” and “lower” may be used herein for ease of description to describe one element&#39;s relationship to another element as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as being “above” or “upper” relative to another element will then be “below” or “lower” relative to the other element. Thus, the term “above” encompasses both the above and below orientations depending on the spatial orientation of the device. The device may also be oriented in other ways (for example, rotated by 90° or at other orientations), and the spatially relative terms used herein are to be interpreted accordingly. 
     The terminology used herein is for describing various examples only, and is not to be used to limit the disclosure. The articles “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “includes,” and “has” specify the presence of stated features, numbers, operations, members, elements, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, members, elements, and/or combinations thereof. 
     Due to manufacturing techniques and/or tolerances, variations of the shapes illustrated in the drawings may occur. Thus, the examples described herein are not limited to the specific shapes illustrated in the drawings, but include changes in shape occurring during manufacturing. 
     The features of the examples described herein may be combined in various ways as will be apparent after an understanding of the disclosure of this application. Furthermore, although the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the disclosure of this application. 
     In the drawings, thicknesses, sizes, and shapes of lenses may have been slightly exaggerated for convenience of explanation. In particular, shapes of spherical surfaces or aspherical surfaces illustrated in the drawings are illustrated by way of example. That is, the shapes of the spherical surfaces or the aspherical surfaces are not limited to those illustrated in the drawings. 
     In the embodiments described herein, a first lens refers to a lens closest to an object (or a subject), and a seventh lens refers to a lens closest to an imaging plane (or an image sensor). 
     A unit of radiuses of curvature of lens surfaces, thicknesses of lenses and other optical elements, gaps between lenses and other optical elements, TTL (a distance from an object-side surface of the first lens to the imaging plane), BFL (a distance from an image-side surface of the seventh lens to the imaging plane), ImgH (a maximum effective image height on the imaging plane, which is equal to one half of a diagonal length of an effective imaging area of the imaging plane), focal lengths, and effective radiuses of surfaces of lenses and other optical elements are expressed in millimeters (mm). 
     Thicknesses of lenses and other optical elements, gaps between lenses and other optical elements, TTL, and BFL are measured along an optical axis of the imaging lens system. Radiuses of curvature of lens surfaces are measured at the optical axis. 
     Unless stated otherwise, a reference to a shape of a lens surface refers to a shape of a paraxial region of the lens surface. A paraxial region of a lens surface is a central portion of the lens surface surrounding and including the optical axis of the lens surface in which light rays incident to the lens surface make a small angle θ to the optical axis, and the approximations sin θ≈θ, tan θ≈θ, and cos θ≈1 are valid. 
     For example, a statement that an object-side surface of a lens is convex means that at least a paraxial region of the object-side surface of the lens is convex, and a statement that an image-side surface of the lens is concave means that at least a paraxial region of the image-side surface of the lens is concave. Therefore, even though the object-side surface of the lens may be described as convex, the entire object-side surface of the lens may not be convex, and a peripheral region of the object-side surface of the lens may be concave. Also, even though the image-side surface of the lens may be described as concave, the entire image-side surface of the lens may not be concave, and a peripheral region of the image-side surface of the lens may be convex. 
     An effective aperture radius or effective radius of a lens surface is a radius of a portion of the lens surface through which light actually passes, and is not necessarily a radius of an outer edge of the lens surface. Stated another way, the effective aperture radius or effective radius of a lens surface is a distance in a direction perpendicular to an optical axis of the lens surface between the optical axis and a marginal ray of light passing through the lens surface. The object-side surface of a lens and the image-side surface of the lens may have different effective aperture radiuses or effective radiuses. 
     The imaging lens system of the embodiments described herein may be configured to be mounted on a transportation device. For example, the imaging lens system may be mounted on a front and rear surveillance camera or an autonomous driving camera mounted on a passenger car, a truck, a fire truck, a forklift, or other transportation device. However, imaging lens system is not limited to the above-described examples. For example, the imaging lens system may be mounted on an imaging camera of a surveillance drone or a transportation drone. 
     An imaging lens system in a first embodiment may include a plurality of lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed in ascending numerical order along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging plane of the imaging lens system. 
     The imaging lens system in the first embodiment may satisfy a specific conditional expression. For example, the imaging lens system in the first embodiment may satisfy a conditional expression of 0.13&lt;ImgH/TTL&lt;0.16, where ImgH is a maximum effective image height on the imaging plane and TTL is a distance along the optical axis from the object-side surface of the first lens to the imaging plane. 
     As another example, the imaging lens system in the first embodiment may satisfy a conditional expression of 5.3&lt;TTL/f&lt;5.5, where TTL is as described above and f is a focal length of the imaging lens system. 
     An imaging lens system in a second embodiment may include a plurality of lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed in ascending numerical order along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging plane of the imaging lens system. 
     The imaging lens system in the second embodiment may include a lens having a predetermined refractive power. For example, the imaging lens system in the second embodiment may include a first lens having a negative refractive power and a second lens having a negative refractive power. The imaging lens system in the second embodiment may satisfy a specific conditional expression. For example, the imaging lens system in the second embodiment may satisfy a conditional expression 5.3&lt;TTL/f&lt;5.5, where TTL and f are as described above. 
     An imaging lens system in a third embodiment may be configured to satisfy one or more of the conditional expressions listed below. For example, the imaging lens system in the third embodiment may include seven lenses, and may satisfy two or more of the conditional expressions listed below. As another example, the imaging lens system in the third embodiment may include seven lenses, and may be configured to satisfy all of the conditional expressions listed below. 
       0.13&lt; ImgH/TTL&lt; 0.16  (Conditional Expression 1)
 
       5.3&lt; TTL/f&lt; 5.5  (Conditional Expression 2)
 
       0.49≤| f/f 3|&lt;0.6  (Conditional Expression 3)
 
         L 1 ER 1/ TTL&lt; 0.5  (Conditional Expression 4)
 
         f 2/ f 3&lt;0  (Conditional Expression 5)
 
         f 5/ f 6&lt;0  (Conditional Expression 6)
 
         L 1 ER 1/ ImgH&lt; 3.0  (Conditional Expression 7)
 
       25&lt;| V 5− V 6|  (Conditional Expression 8)
 
         f 56&lt;0  (Conditional Expression 9)
 
       80 °&lt;HFOV &lt;90°  (Conditional Expression 10)
 
       94 °&lt;DFOV &lt;104°  (Conditional Expression 11)
 
     In the conditional expressions listed above, ImgH is a maximum effective image height on the imaging plane, TTL is a distance along the optical axis from an object-side surface of the first lens to the imaging plane, f is a focal length of the imaging lens system, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f5 is a focal length of the fifth lens, f6 is a focal length of the sixth lens, L1ER1 is an effective radius of an object-side surface of the first lens, V5 is an Abbe number of the fifth lens, V6 is an Abbe number of the sixth lens, f56 is a combined focal length of the fifth and sixth lenses, HFOV is a field of view of the imaging plane in a horizontal direction expressed in degrees, and DFOV is a field of view of the imaging plane in a diagonal direction expressed in degrees. 
     The imaging lens system in the third embodiment may satisfy some of the conditional expressions listed above in a more limited manner as listed below: 
       0.26&lt; DER 1/ TTL&lt; 0.46  (Conditional Expression 12)
 
       -2.0&lt; f 2/ f 3&lt;−1.0  (Conditional Expression 13)
 
       -1.6&lt; f 5/ f 6&lt;−1.2  (Conditional Expression 14)
 
       2.0&lt; L 1 ER 1 /ImgH &lt;3.0  (Conditional Expression 15)
 
       -100&lt; f 56&lt;−18  (Conditional Expression 16)
 
     An imaging lens system in a fourth embodiment may be configured to satisfy one or more of the conditional expressions listed below. For example, the imaging lens system in the fourth embodiment may include seven lenses, and may satisfy two or more of the conditional expressions listed below. As another example, the imaging lens system in the fourth embodiment may include seven lenses and may be configured to satisfy all of the conditional expressions listed below: 
       1.6&lt; f -number&lt;1.9  (Conditional Expression 17)
 
       0.7 &lt;ImgH/f&lt; 1.0  (Conditional Expression 18)
 
       0.03&lt; D 34/ D 12&lt;0.20  (Conditional Expression 19)
 
       0.60&lt; D 34/ D 45&lt;3.0  (Conditional Expression 20)
 
       1.64 &lt;SumNd/ 7&lt;1.76  (Conditional Expression 21)
 
       24 &lt;SumV/SumNd &lt;29  (Conditional Expression 22)
 
       2.8&lt;( R 6+ R 7)/( R 6- R 7)&lt;5.8  (Conditional Expression 23)
 
       -0.10&lt;( R 8+ R 9)/( R 8- R 9)&lt;0.3  (Conditional Expression 24)
 
       0.08 mm/°&lt; DER 1 /HFOV &lt;0.140 mm/°  (Conditional Expression 25)
 
     In the conditional expressions listed above, f-number is equal to the focal length f of the imaging lens system divided by an entrance pupil diameter of the imaging lens system and is a dimensionless quantity, D12 is a distance along the optical axis from an image-side surface of the first lens to an object-side surface of the second lens, D34 is a distance along the optical axis from an image-side surface of the third lens to an object-side surface of the fourth lens, D45 is a distance along the optical axis from an image-side surface of the fourth lens to an object-side surface of the fifth lens, SumV is a sum of the Abbe numbers of the first to seventh lenses, SumNd is a sum of the refractive indices of the first to seventh lenses, R6 is a radius of curvature of an image-side surface of the third lens, R7 is a radius of curvature of an object-side surface of the fourth lens, R8 is a radius of curvature of an image-side surface of the fourth lens, and R9 is a radius of curvature of an object-side surface of the fifth lens. 
     An imaging lens system in an embodiment may include one or more lenses having the properties described below. For example, the imaging lens system in the first embodiment may include one of the first to seventh lenses having the properties described below. As another example, the imaging lens system in the second to fourth embodiments may include one or more of the first to seventh lenses having the properties described below. However, the imaging lens system in the aforementioned embodiments does not necessarily include a lens having the properties described below. Hereinafter, the first to seventh lenses will be described. 
     The first lens may have a refractive power. For example, the first lens may have a negative refractive power. One surface of the first lens may be convex. For example, the first lens may have a convex object-side surface. The first lens may include a spherical surface. For example, both surfaces of the first lens may be spherical. The first lens may be formed of a material having a high light transmissivity and an excellent workability. For example, the first lens may be formed of a plastic material or a glass material. The first lens may be configured to have a predetermined refractive index. For example, the refractive index of the first lens may be greater than 1.7. For example, the refractive index of the first lens may be greater than 1.70 and less than 1.8. However, the refractive index of the first lens is not limited to the above-described range. For example, the first lens may have a refractive index of less than 1.7 only when the refractive index of the second lens is greater than 1.9. The first lens may have a predetermined Abbe number. For example, the Abbe number of the first lens may be 40 or more. For example, the Abbe number of the first lens may be greater than 40 and less than 82. 
     The second lens may have a refractive power. For example, the second lens may have a negative refractive power. One surface of the second lens may be concave. For example, the second lens may have a concave object-side surface. The second lens may include an aspherical surface. For example, both surfaces of the second lens may be aspherical. The second lens may be formed of a material having a high light transmissivity and an excellent workability. For example, the second lens may be formed of a plastic material or a glass material. The second lens may be configured to have a predetermined refractive index. For example, the refractive index of the second lens may be greater than 1.5. For example, the refractive index of the second lens may be greater than 1.56 and less than 1.92. The second lens may have a predetermined Abbe number. For example, the Abbe number of the second lens may be 20 or more. For example, the Abbe number of the second lens may be greater than 20 and less than 40. 
     The third lens may have a refractive power. For example, the third lens may have a positive refractive power. One surface of the third lens may be convex. For example, the third lens may have a convex object-side surface or a convex image-side surface. The third lens may include an aspherical surface. For example, both surfaces of the third lens may be aspherical. The third lens may be formed of a material having a high light transmissivity and an excellent workability. For example, the third lens may be formed of a plastic material or a glass material. The third lens may be configured to have a predetermined refractive index. For example, the refractive index of the third lens may be greater than 1.6 and less than 1.9. The third lens may have a predetermined Abbe number. For example, the Abbe number of the third lens may be greater than 20 and less than 30. 
     The fourth lens may have a refractive power. For example, the fourth lens may have a positive refractive power. One surface of the fourth lens may be convex. For example, the fourth lens may have a convex image-side surface. The fourth lens may include a spherical surface. For example, both surfaces of the fourth lens may be spherical. The fourth lens may be formed of a material having a high light transmissivity and an excellent workability. For example, the fourth lens may be formed of a plastic material or a glass material. The fourth lens may be configured to have a predetermined refractive index. For example, the refractive index of the fourth lens may be greater than 1.46 and less than 1.64. The fourth lens may have a predetermined Abbe number. For example, the Abbe number of the fourth lens may be greater than 56 and less than 90. 
     The fifth lens may have a refractive power. For example, the fifth lens may have a positive refractive power. One surface of the fifth lens may be convex. For example, the fifth lens may have a convex object-side surface. The fifth lens may include a spherical surface. For example, both surfaces of the fifth lens may be spherical. The fifth lens may be formed of a material having a high light transmissivity and an excellent workability. For example, the fifth lens may be formed of a plastic material or a glass material. The fifth lens may be configured to have a predetermined refractive index. For example, the refractive index of the fifth lens may be greater than 1.56. For example, the refractive index of the fifth lens may be greater than 1.56 and less than 1.70. The fifth lens may have a predetermined Abbe number. For example, the Abbe number of the fifth lens may be 50 or more. For example, the Abbe number of the fifth lens may be greater than 52 and less than 64. 
     The sixth lens may have a refractive power. For example, the sixth lens may have a negative refractive power. One surface of the sixth lens may be concave. As an example, the sixth lens may have a concave object-side surface. The sixth lens may include a spherical surface. For example, both surfaces of the sixth lens may be spherical. The sixth lens may be formed of a material having a high light transmissivity and an excellent workability. For example, the sixth lens may be formed of a plastic material or a glass material. The sixth lens may be configured to have a predetermined refractive index. For example, the refractive index of the sixth lens may be greater than 1.70 and less than 1.80. The sixth lens may have a predetermined Abbe number. For example, the Abbe number of the sixth lens may be greater than 20 and less than 30. 
     The seventh lens may have a refractive power. For example, the seventh lens may have a positive refractive power. One surface of the seventh lens may be convex. For example, the seventh lens may have a convex image-side surface. The seventh lens may include an aspherical surface. For example, both surfaces of the seventh lens may be aspherical. The seventh lens may include an inflection point. For example, an inflection point may be formed on at least one of an object-side surface and an image-side surface of the seventh lens. The seventh lens may be formed of a material having a high light transmissivity and an excellent workability. For example, the seventh lens may be formed of a plastic material or a glass material. The seventh lens may be configured to have a predetermined refractive index. For example, the refractive index of the seventh lens may be greater than 1.60 and less than 1.90. The seventh lens may have a predetermined Abbe number. For example, the Abbe number of the seventh lens may be greater than 40 and less than 64. 
     The first to seventh lenses may include a spherical surface or an aspherical surface as described above. The aspherical surfaces of the lenses may be represented by Equation 1 below. 
     
       
         
           
             
               
                 
                   Z 
                   = 
                   
                     
                       
                         cr 
                         2 
                       
                       
                         1 
                         + 
                         
                           
                             1 
                             - 
                             
                               
                                 ( 
                                 
                                   1 
                                   + 
                                   k 
                                 
                                 ) 
                               
                               ⁢ 
                               
                                 c 
                                 2 
                               
                               ⁢ 
                               
                                 r 
                                 2 
                               
                             
                           
                         
                       
                     
                     + 
                     
                       Ar 
                       4 
                     
                     + 
                     
                       Br 
                       6 
                     
                     + 
                     
                       Cr 
                       8 
                     
                     + 
                     
                       Dr 
                       10 
                     
                     + 
                     
                       Er 
                       12 
                     
                     + 
                     
                       Fr 
                       14 
                     
                     + 
                     
                       Gr 
                       16 
                     
                     + 
                     
                       Hr 
                       18 
                     
                     + 
                     
                       Jr 
                       20 
                     
                   
                 
               
               
                 
                   ( 
                   1 
                   ) 
                 
               
             
           
         
       
     
     In Equation 1, c is a curvature of a lens surface and is equal to a reciprocal of a radius of curvature of the lens surface at an optical axis of the lens surface, k is a conic constant, r is a distance from any point on the lens surface to the optical axis of the lens surface in a direction perpendicular to the optical axis of the lens surface, A, B, C, D, E, F, G, H, and J are aspherical constants, Z (or sag) is a distance in a direction parallel to the optical axis of the lens surface from the point on the lens surface at the distance r from the optical axis of the lens surface to a tangential plane perpendicular to the optical axis and intersecting a vertex of the lens surface. 
     The imaging lens system in the embodiments described above may further include a stop, a filter, and a cover glass. As an example, the imaging lens system may further include a stop disposed between the fourth lens and the fifth lens. As another example, the imaging lens system may further include a filter and a cover glass disposed between the seventh lens and the imaging plane. The stop may be configured to adjust the amount of light incident on the imaging plane. The filter may be configured to block a specific wavelength of light or a specific range of wavelengths of light, and the cover glass may be configured to block foreign substances from reaching the imaging plane. As an example, the filter may be configured to block infrared light, but may additionally or alternatively be configured to block ultraviolet light. 
       FIG.  1    is a diagram illustrating a first embodiment of an imaging lens system, and  FIG.  2    is aberration curves of the imaging lens system illustrated in  FIG.  1   . 
     Referring to  FIG.  1   , an imaging lens system  100  may include a first lens  110 , a second lens  120 , a third lens  130 , a fourth lens  140 , a fifth lens  150 , a sixth lens  160 , and a seventh lens  170 . 
     The first lens  110  may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens  120  may have a negative refractive power, and may have a concave object-side surface and a convex image-side surface. The third lens  130  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The fourth lens  140  may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. The fifth lens  150  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The sixth lens  160  may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens  170  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the image-side surface of the seventh lens  170 . The fifth lens  150  and the sixth lens  160  may be bonded to each other. In greater detail, a radius of curvature of the image-side surface of the fifth lens  150  and a radius of curvature of the object-side surface of the sixth lens  160  may be configured to be substantially the same, and the image-side surface of the fifth lens  150  may be in contact with the object-side surface of the sixth lens  160  in a center of the optical axis. 
     The imaging lens system  100  may further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the fourth lens  140  and the fifth lens  150 , and the filter IF and the cover glass CG may be disposed between the seventh lens  170  and the imaging plane IP. The imaging plane IP may be formed in at a position at which light incident through the first lens  110  to the seventh lens  170  is focused. For example, the imaging plane IP may be formed on one surface of an image sensor IS of a camera module or within the image sensor IS. 
     Tables 1 and 2 below list the lens properties and aspherical values of the first embodiment of the imaging lens system. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                 Surface 
                   
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe 
                 Effective 
               
               
                 No. 
                 Component 
                 Curvature 
                 Distance 
                 Index 
                 Number 
                 Radius 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 S1 
                 First Lens 
                 27.2287 
                 0.6000 
                 1.777 
                 49.6 
                 4.692 
               
               
                 S2 
                   
                 4.5548 
                 4.9502 
                   
                   
                 3.542 
               
               
                 S3 
                 Second Lens 
                 −3.3431 
                 1.6907 
                 1.601 
                 30.4 
                 3.003 
               
               
                 S4 
                   
                 −6.6665 
                 0.1000 
                   
                   
                 3.269 
               
               
                 S5 
                 Third Lens 
                 6.2933 
                 2.1939 
                 1.618 
                 26.3 
                 3.423 
               
               
                 S6 
                   
                 −36.9517 
                 0.1906 
                   
                   
                 3.208 
               
               
                 S7 
                 Fourth Lens 
                 −24.3693 
                 1.3176 
                 1.623 
                 60.3 
                 3.186 
               
               
                 S8 
                   
                 −12.5741 
                 0.0000 
                   
                   
                 3.024 
               
               
                 S9 
                 Stop 
                 Infinity 
                 0.3000 
                   
                   
                 2.865 
               
               
                 S10 
                 Fifth Lens 
                 8.2508 
                 2.8899 
                 1.618 
                 60.6 
                 3.025 
               
               
                 S11 
                 Sixth Lens 
                 −3.9900 
                 0.6000 
                 1.749 
                 28.1 
                 2.984 
               
               
                 S12 
                   
                 6.6444 
                 0.1000 
                   
                   
                 3.105 
               
               
                 S13 
                 Seventh Lens 
                 7.7338 
                 1.6902 
                 1.650 
                 55.5 
                 3.132 
               
               
                 S14 
                   
                 −10.2819 
                 2.7218 
                   
                   
                 3.186 
               
               
                 S15 
                 Filter 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.432 
               
               
                 S16 
                   
                 Infinity 
                 0.5500 
                   
                   
                 3.454 
               
               
                 S17 
                 Cover Glass 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.498 
               
               
                 S18 
                   
                 Infinity 
                 3.8036 
                   
                   
                 3.519 
               
               
                 S19 
                 Imaging Plane 
                 Infinity 
                 0.0015 
                   
                   
                 3.827 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 2 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
               
               
                 No. 
                 S3 
                 S4 
                 S5 
                 S6 
                 S13 
                 S14 
               
               
                   
               
             
            
               
                 k 
                 −1.26022E+00 
                 −2.71647E+00 
                 −2.04937E−01 
                 −5.87526E+01 
                 0.00000E+00 
                 0.00000E+00 
               
               
                 A 
                  2.59351E−03 
                  2.46173E−03 
                 −1.65008E−05 
                 −1.57045E−04 
                 2.44654E−04 
                 1.10893E−03 
               
               
                 B 
                 −1.10782E−04 
                 −2.47393E−05 
                  2.58956E−05 
                  6.35081E−05 
                 2.80354E−05 
                 3.28342E−05 
               
               
                 C 
                  5.54083E−07 
                 −6.16987E−07 
                  7.87004E−08 
                 −1.02142E−06 
                 −7.33986E−07  
                 2.71772E−07 
               
               
                 D 
                 0 
                 0 
                 0 
                 0 
                 4.00308E−08 
                 4.64438E−08 
               
               
                 E 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 F 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 G 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 H 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 J 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
       FIG.  3    is a diagram illustrating a second embodiment of an imaging lens system, and  FIG.  4    is aberration curves of the imaging lens system illustrated in  FIG.  3   . 
     Referring to  FIG.  3   , an imaging lens system  200  may include a first lens  210 , a second lens  220 , a third lens  230 , a fourth lens  240 , a fifth lens  250 , a sixth lens  260 , and a seventh lens  270 . 
     The first lens  210  may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens  220  may have a negative refractive power, and may have a concave object-side surface and a convex image-side surface. The third lens  230  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The fourth lens  240  may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. The fifth lens  250  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The sixth lens  260  may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens  270  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the image-side surface of the seventh lens  270 . The fifth lens  250  and the sixth lens  260  may be bonded to each other. In greater detail, a radius of curvature of the image-side surface of the fifth lens  250  and a radius of curvature of the object-side surface of the sixth lens  260  may be configured to be substantially the same, and the image-side surface of the fifth lens  250  may be in contact with the object-side surface of the sixth lens  260  in a center of the optical axis. 
     The imaging lens system  200  may further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the fourth lens  240  and the fifth lens  250 , and the filter IF and the cover glass CG may be disposed between the seventh lens  270  and the imaging plane IP. The imaging plane IP may be formed at a position at which light incident through the first lens  210  to the seventh lens  270  is focused. For example, the imaging plane IP may be formed on one surface of an image sensor IS of a camera module or within the image sensor IS. 
     Tables 3 and 4 below list the lens properties and aspherical values of the second embodiment of the imaging lens system. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 3 
               
               
                   
               
               
                 Surface 
                   
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe 
                 Effective 
               
               
                 No. 
                 Component 
                 Curvature 
                 Distance 
                 Index 
                 Number 
                 Radius 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 S1 
                 First Lens 
                 34.2208 
                 0.6000 
                 1.777 
                 49.6 
                 4.708 
               
               
                 S2 
                   
                 4.6587 
                 4.8374 
                   
                   
                 3.569 
               
               
                 S3 
                 Second Lens 
                 −2.9907 
                 1.3789 
                 1.586 
                 34.7 
                 3.135 
               
               
                 S4 
                   
                 −5.2871 
                 0.1000 
                   
                   
                 3.425 
               
               
                 S5 
                 Third Lens 
                 6.7569 
                 2.6405 
                 1.608 
                 28.0 
                 3.589 
               
               
                 S6 
                   
                 −29.2590 
                 0.6275 
                   
                   
                 3.287 
               
               
                 S7 
                 Fourth Lens 
                 −18.2154 
                 1.0150 
                 1.535 
                 66.0 
                 3.156 
               
               
                 S8 
                   
                 −10.2202 
                 0.0000 
                   
                   
                 3.054 
               
               
                 S9 
                 Stop 
                 Infinity 
                 0.3000 
                   
                   
                 2.865 
               
               
                 S10 
                 Fifth Lens 
                 7.2801 
                 2.4907 
                 1.606 
                 61.3 
                 3.114 
               
               
                 S11 
                 Sixth Lens 
                 −6.0000 
                 0.6000 
                 1.762 
                 27.6 
                 3.080 
               
               
                 S12 
                   
                 6.0978 
                 0.1000 
                   
                   
                 3.127 
               
               
                 S13 
                 Seventh Lens 
                 7.0663 
                 1.9275 
                 1.623 
                 60.3 
                 3.157 
               
               
                 S14 
                   
                 −10.4315 
                 2.7218 
                   
                   
                 3.221 
               
               
                 S15 
                 Filter 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.454 
               
               
                 S16 
                   
                 Infinity 
                 0.5500 
                   
                   
                 3.474 
               
               
                 S17 
                 Cover Glass 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.515 
               
               
                 S18 
                   
                 Infinity 
                 3.8082 
                   
                   
                 3.535 
               
               
                 S19 
                 Imaging Plane 
                 Infinity 
                 0.0000 
                   
                   
                 3.827 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 4 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
               
               
                 No. 
                 S3 
                 S4 
                 S5 
                 S6 
                 S13 
                 S14 
               
               
                   
               
             
            
               
                 k 
                 −1.34648E+00 
                 −2.44187E+00 
                 −2.42564E−01 
                 −7.80509E+01 
                 0.00000E+00 
                 0.00000E+00 
               
               
                 A 
                  2.77606E−03 
                  2.42651E−03 
                 −5.40172E−05 
                 −9.03204E−05 
                 3.37739E−04 
                 1.09522E−03 
               
               
                 B 
                 −1.20855E−04 
                 −2.00450E−05 
                  2.86947E−05 
                  6.42230E−05 
                 2.89340E−05 
                 3.44935E−05 
               
               
                 C 
                  2.09243E−07 
                 −1.37096E−06 
                  1.94235E−07 
                 −5.88885E−08 
                 −9.00864E−07  
                 −3.86445E−08  
               
               
                 D 
                 0 
                 0 
                 0 
                 0 
                 3.40525E−08 
                 4.16807E−08 
               
               
                 E 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 F 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 G 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 H 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 J 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
       FIG.  5    is a diagram illustrating a third embodiment of an imaging lens system, and  FIG.  6    is aberration curves of the imaging lens system illustrated in  FIG.  5   . 
     Referring to  FIG.  5   , an imaging lens system  300  may include a first lens  310 , a second lens  320 , a third lens  330 , a fourth lens  340 , a fifth lens  350 , a sixth lens  360 , and a seventh lens  370 . 
     The first lens  310  may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens  320  may have a negative refractive power, and may have a concave object-side surface and a convex image-side surface. The third lens  330  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The fourth lens  340  may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. The fifth lens  350  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The sixth lens  360  may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens  370  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the image-side surface of the seventh lens  370 . The fifth lens  350  and the sixth lens  360  may be bonded to each other. In greater detail, a radius of curvature of the image-side surface of the fifth lens  350  and a radius of curvature of the object-side surface of the sixth lens  360  may be configured to be substantially the same, and the image-side surface of the fifth lens  350  may be in contact with the object-side surface of the sixth lens  360  in a center of the optical axis. 
     The imaging lens system  300  may further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the fourth lens  340  and the fifth lens  350 , and the filter IF and the cover glass CG may be disposed between the seventh lens  370  and the imaging plane IP. The imaging plane IP may be formed at a position at which light incident through the first lens  310  to the seventh lens  370  is focused. For example, the imaging plane IP may be formed on one surface of an image sensor IS of a camera module or within the image sensor IS. 
     Tables 5 and 6 below list the lens properties and aspherical values of the third embodiment of the imaging lens system. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 5 
               
               
                   
               
               
                 Surface 
                   
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe 
                 Effective 
               
               
                 No. 
                 Component 
                 Curvature 
                 Distance 
                 Index 
                 Number 
                 Radius 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 S1 
                 First Lens 
                 23.1884 
                 0.6500 
                 1.777 
                 49.6 
                 4.789 
               
               
                 S2 
                   
                 4.5162 
                 5.1326 
                   
                   
                 3.578 
               
               
                 S3 
                 Second Lens 
                 −3.2754 
                 1.4695 
                 1.722 
                 30.7 
                 2.979 
               
               
                 S4 
                   
                 −6.1331 
                 0.1000 
                   
                   
                 3.261 
               
               
                 S5 
                 Third Lens 
                 6.9693 
                 2.5463 
                 1.699 
                 27.9 
                 3.421 
               
               
                 S6 
                   
                 −28.5661 
                 0.5409 
                   
                   
                 3.184 
               
               
                 S7 
                 Fourth Lens 
                 −19.2482 
                 0.8799 
                 1.559 
                 65.5 
                 3.090 
               
               
                 S8 
                   
                 −10.0461 
                 0.0000 
                   
                   
                 3.052 
               
               
                 S9 
                 Stop 
                 Infinity 
                 0.3000 
                   
                   
                 2.993 
               
               
                 S10 
                 Fifth Lens 
                 8.7504 
                 2.8431 
                 1.609 
                 57.8 
                 2.981 
               
               
                 S11 
                 Sixth Lens 
                 −4.4919 
                 0.6500 
                 1.753 
                 26.1 
                 2.937 
               
               
                 S12 
                   
                 7.6962 
                 0.1000 
                   
                   
                 3.078 
               
               
                 S13 
                 Seventh Lens 
                 9.9616 
                 1.5838 
                 1.648 
                 53.5 
                 3.081 
               
               
                 S14 
                   
                 −9.5299 
                 2.7218 
                   
                   
                 3.146 
               
               
                 S15 
                 Filter 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.416 
               
               
                 S16 
                   
                 Infinity 
                 0.5500 
                   
                   
                 3.439 
               
               
                 S17 
                 Cover Glass 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.486 
               
               
                 S18 
                   
                 Infinity 
                 3.6292 
                   
                   
                 3.509 
               
               
                 S19 
                 Imaging Plane 
                 Infinity 
                 0.0000 
                   
                   
                 3.826 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 6 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
               
               
                 No. 
                 S3 
                 S4 
                 S5 
                 S6 
                 S13 
                 S14 
               
               
                   
               
             
            
               
                 k 
                 −1.37253E+00 
                 −2.57160E+00 
                 −2.68985E−01 
                 −5.58542E+01 
                 0.00000E+00 
                 0.00000E+00 
               
               
                 A 
                  2.81547E−03 
                  2.46100E−03 
                 −6.51837E−05 
                 −8.20675E−05 
                 3.68914E−04 
                 1.04387E−03 
               
               
                 B 
                 −1.27300E−04 
                 −2.23332E−05 
                  2.75520E−05 
                  5.79077E−05 
                 3.20447E−05 
                 3.14249E−05 
               
               
                 C 
                  1.40530E−06 
                 −1.41928E−06 
                 −3.23353E−07 
                 −7.82116E−07 
                 −1.32687E−07  
                 1.64455E−06 
               
               
                 D 
                 −7.30335E−08 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 E 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 F 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 G 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 H 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 J 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
       FIG.  7    is a diagram illustrating a fourth embodiment of an imaging lens system, and  FIG.  8    is aberration curves of the imaging lens system illustrated in  FIG.  7   . 
     Referring to  FIG.  7   , an imaging lens system  400  may include a first lens  410 , a second lens  420 , a third lens  430 , a fourth lens  440 , a fifth lens  450 , a sixth lens  460 , and a seventh lens  470 . 
     The first lens  410  may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens  420  may have a negative refractive power, and may have a concave object-side surface and a convex image-side surface. The third lens  430  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The fourth lens  440  may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. The fifth lens  450  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The sixth lens  460  may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens  470  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the image-side surface of the seventh lens  470 . The fifth lens  450  and the sixth lens  460  may be bonded to each other. In greater detail, a radius of curvature of the image-side surface of the fifth lens  450  and a radius of curvature of the object-side surface of the sixth lens  460  may be configured to be substantially the same, and the image-side surface of the fifth lens  450  may be in contact with the object-side surface of the sixth lens  460  in a center of the optical axis. 
     The imaging lens system  400  may further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the fourth lens  440  and the fifth lens  450 , and the filter IF and the cover glass CG may be disposed between the seventh lens  470  and the imaging plane IP. The imaging plane IP may be formed at a position at which light incident through the first lens  410  to the seventh lens  470  is focused. For example, the imaging plane IP may be formed on one surface of an image sensor IS of a camera module or within the image sensor IS. 
     Tables 7 and 8 below list the lens properties and aspherical values of the fourth embodiment of the imaging lens system. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 7 
               
               
                   
               
               
                 Surface 
                   
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe 
                 Effective 
               
               
                 No. 
                 Component 
                 Curvature 
                 Distance 
                 Index 
                 Number 
                 Radius 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 S1 
                 First Lens 
                 16.3708 
                 0.6000 
                 1.777 
                 49.6 
                 4.972 
               
               
                 S2 
                   
                 4.5113 
                 5.1140 
                   
                   
                 3.716 
               
               
                 S3 
                 Second Lens 
                 −3.5483 
                 1.6447 
                 1.877 
                 31.1 
                 3.057 
               
               
                 S4 
                   
                 −7.1741 
                 0.2664 
                   
                   
                 3.347 
               
               
                 S5 
                 Third Lens 
                 6.9348 
                 2.0886 
                 1.713 
                 27.7 
                 3.573 
               
               
                 S6 
                   
                 −30.0100 
                 0.6818 
                   
                   
                 3.394 
               
               
                 S7 
                 Fourth Lens 
                 −19.4052 
                 0.8931 
                 1.542 
                 69.0 
                 3.224 
               
               
                 S8 
                   
                 −10.7718 
                 0.0000 
                   
                   
                 3.128 
               
               
                 S9 
                 Stop 
                 Infinity 
                 0.3000 
                   
                   
                 2.928 
               
               
                 S10 
                 Fifth Lens 
                 8.5417 
                 3.1464 
                 1.607 
                 58.0 
                 3.107 
               
               
                 S11 
                 Sixth Lens 
                 −4.2751 
                 0.6000 
                 1.749 
                 25.7 
                 3.070 
               
               
                 S12 
                   
                 7.7675 
                 0.1006 
                   
                   
                 3.214 
               
               
                 S13 
                 Seventh Lens 
                 10.2983 
                 1.4257 
                 1.735 
                 47.1 
                 3.214 
               
               
                 S14 
                   
                 −10.5262 
                 2.7218 
                   
                   
                 3.245 
               
               
                 S15 
                 Filter 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.473 
               
               
                 S16 
                   
                 Infinity 
                 0.5500 
                   
                   
                 3.493 
               
               
                 S17 
                 Cover Glass 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.534 
               
               
                 S18 
                   
                 Infinity 
                 3.5669 
                   
                   
                 3.554 
               
               
                 S19 
                 Imaging Plane 
                 Infinity 
                 0.0000 
                   
                   
                 3.832 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 8 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
               
               
                 No. 
                 S3 
                 S4 
                 S5 
                 S6 
                 S13 
                 S14 
               
               
                   
               
             
            
               
                 k 
                 −1.41513E+00 
                 −2.61666E+00 
                 −2.77108E−01 
                 −5.37751E+01 
                 0.00000E+00 
                 0.00000E+00 
               
               
                 A 
                  2.91518E−03 
                  2.47729E−03 
                 −6.87241E−05 
                 −1.06289E−04 
                 4.31147E−04 
                 1.10599E−03 
               
               
                 B 
                 −1.23618E−04 
                 −2.08587E−05 
                  2.69573E−05 
                  5.39755E−05 
                 2.95271E−05 
                 3.56385E−05 
               
               
                 C 
                  1.81365E−06 
                 −1.19453E−06 
                 −3.27656E−07 
                 −8.91816E−07 
                 1.79876E−07 
                 1.74588E−06 
               
               
                 D 
                 −5.62274E−08 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 E 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 F 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 G 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 H 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 J 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
       FIG.  9    is a diagram illustrating a fifth embodiment of an imaging lens system, and  FIG.  10    is aberration curves of the imaging lens system illustrated in  FIG.  9   . 
     Referring to  FIG.  9   , an imaging lens system  500  may include a first lens  510 , a second lens  520 , a third lens  530 , a fourth lens  540 , a fifth lens  550 , a sixth lens  560 , and a seventh lens  570 . 
     The first lens  510  may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens  520  may have a negative refractive power, and may have a concave object-side surface and a convex image-side surface. The third lens  530  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The fourth lens  540  may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. The fifth lens  550  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The sixth lens  560  may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens  570  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the image-side surface of the seventh lens  570 . The fifth lens  550  and the sixth lens  560  may be bonded to each other. In greater detail, a radius of curvature of the image-side surface of the fifth lens  550  and a radius of curvature of the object-side surface of the sixth lens  560  may be configured to be substantially the same, and the image-side surface of the fifth lens  550  may be in contact with the object-side surface of the sixth lens  560  in a center of the optical axis. 
     The imaging lens system  500  may further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the fourth lens  540  and the fifth lens  550 , and the filter IF and the cover glass CG may be disposed between the seventh lens  570  and the imaging plane IP. The imaging plane IP may be formed at a position at which light incident through the first lens  510  to the seventh lens  570  is focused. For example, the imaging plane IP may be formed on one surface of an image sensor IS of a camera module or within the image sensor IS. 
     Tables 9 and 10 below list the lens properties and aspherical values of the fifth embodiment of the imaging lens system. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 9 
               
               
                   
               
               
                 Surface 
                   
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe 
                 Effective 
               
               
                 No. 
                 Component 
                 Curvature 
                 Distance 
                 Index 
                 Number 
                 Radius 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 S1 
                 First Lens 
                 19.1919 
                 0.6000 
                 1.777 
                 49.6 
                 4.891 
               
               
                 S2 
                   
                 4.4868 
                 4.9686 
                   
                   
                 3.653 
               
               
                 S3 
                 Second Lens 
                 −3.5939 
                 1.6680 
                 1.814 
                 32.0 
                 3.097 
               
               
                 S4 
                   
                 −7.2852 
                 0.1000 
                   
                   
                 3.426 
               
               
                 S5 
                 Third Lens 
                 7.0500 
                 1.9718 
                 1.754 
                 27.7 
                 3.658 
               
               
                 S6 
                   
                 −30.9595 
                 0.6497 
                   
                   
                 3.494 
               
               
                 S7 
                 Fourth Lens 
                 −16.0765 
                 1.6036 
                 1.609 
                 57.8 
                 3.361 
               
               
                 S8 
                   
                 −9.0919 
                 0.0000 
                   
                   
                 3.208 
               
               
                 S9 
                 Stop 
                 Infinity 
                 0.3000 
                   
                   
                 2.919 
               
               
                 S10 
                 Fifth Lens 
                 8.1759 
                 2.4946 
                 1.628 
                 55.5 
                 3.079 
               
               
                 S11 
                 Sixth Lens 
                 −4.3502 
                 0.6000 
                 1.769 
                 25.0 
                 3.045 
               
               
                 S12 
                   
                 11.0043 
                 0.8000 
                   
                   
                 3.114 
               
               
                 S13 
                 Seventh Lens 
                 14.0791 
                 1.3776 
                 1.603 
                 58.6 
                 3.379 
               
               
                 S14 
                   
                 −11.6573 
                 2.7218 
                   
                   
                 3.388 
               
               
                 S15 
                 Filter 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.566 
               
               
                 S16 
                   
                 Infinity 
                 0.5500 
                   
                   
                 3.582 
               
               
                 S17 
                 Cover Glass 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.615 
               
               
                 S18 
                   
                 Infinity 
                 3.2946 
                   
                   
                 3.630 
               
               
                 S19 
                 Imaging Plane 
                 Infinity 
                 0.0000 
                   
                   
                 3.827 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 10 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
               
               
                 No. 
                 S3 
                 S4 
                 S5 
                 S6 
                 S13 
                 S14 
               
               
                   
               
             
            
               
                 k 
                 −1.35785E+00 
                 −2.56521E+00 
                 −2.64203E−01 
                 −4.09982E+01 
                 0.00000E+00 
                 0.00000E+00 
               
               
                 A 
                  2.77907E−03 
                  2.42620E−03 
                 −6.65400E−05 
                 −1.23359E−04 
                 3.10948E−04 
                 1.25100E−03 
               
               
                 B 
                 −1.34868E−04 
                 −3.09190E−05 
                  2.68557E−05 
                  5.81456E−05 
                 2.69251E−05 
                 3.38497E−05 
               
               
                 C 
                  2.97043E−06 
                 −9.42852E−07 
                 −7.20636E−08 
                 −6.31487E−07 
                 1.21524E−06 
                 1.85444E−06 
               
               
                 D 
                 −1.21191E−07 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 E 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 F 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 G 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 H 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 J 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
       FIG.  11    is a diagram illustrating a sixth embodiment of an imaging lens system, and  FIG.  12    is aberration curves of the imaging lens system illustrated in  FIG.  11   . 
     Referring to  FIG.  11   , an imaging lens system  600  may include a first lens  610 , a second lens  620 , a third lens  630 , a fourth lens  640 , a fifth lens  650 , a sixth lens  660 , and a seventh lens  670 . 
     The first lens  610  may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens  620  may have a negative refractive power, and may have a concave object-side surface and a convex image-side surface. The third lens  630  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The fourth lens  640  may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. The fifth lens  650  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The sixth lens  660  may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens  670  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the image-side surface of the seventh lens  670 . The fifth lens  650  and the sixth lens  660  may be bonded to each other. In greater detail, a radius of curvature of the image-side surface of the fifth lens  650  and a radius of curvature of the object-side surface of the sixth lens  660  may be configured to be substantially the same, and the image-side surface of the fifth lens  650  may be in contact with the object-side surface of the sixth lens  660  in a center of the optical axis. 
     The imaging lens system  600  may further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the fourth lens  640  and the fifth lens  650 , and the filter IF and the cover glass CG may be disposed between the seventh lens  670  and the imaging plane IP. The imaging plane IP may be formed at a position at which light incident through the first lens  610  to the seventh lens  670  is focused. For example, the imaging plane IP may be formed on one surface of an image sensor IS of a camera module or within the image sensor IS. 
     Tables 11 and 12 below list the lens properties and aspherical values of the sixth embodiment of the imaging lens system. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 11 
               
               
                   
               
               
                 Surface 
                   
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe 
                 Effective 
               
               
                 No. 
                 Component 
                 Curvature 
                 Distance 
                 Index 
                 Number 
                 Radius 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 S1 
                 First Lens 
                 16.6536 
                 0.6000 
                 1.777 
                 49.6 
                 4.896 
               
               
                 S2 
                   
                 4.3915 
                 4.9034 
                   
                   
                 3.639 
               
               
                 S3 
                 Second Lens 
                 −3.6380 
                 1.6479 
                 1.817 
                 28.6 
                 3.081 
               
               
                 S4 
                   
                 −7.4329 
                 0.4000 
                   
                   
                 3.378 
               
               
                 S5 
                 Third Lens 
                 7.0805 
                 1.7442 
                 1.750 
                 26.1 
                 3.637 
               
               
                 S6 
                   
                 −30.0069 
                 0.6382 
                   
                   
                 3.517 
               
               
                 S7 
                 Fourth Lens 
                 −16.7446 
                 1.6023 
                 1.559 
                 65.6 
                 3.378 
               
               
                 S8 
                   
                 −9.2538 
                 0.0000 
                   
                   
                 3.198 
               
               
                 S9 
                 Stop 
                 Infinity 
                 0.3000 
                   
                   
                 2.919 
               
               
                 S10 
                 Fifth Lens 
                 8.8333 
                 2.5215 
                 1.632 
                 55.2 
                 3.057 
               
               
                 S11 
                 Sixth Lens 
                 −4.1692 
                 0.6000 
                 1.770 
                 25.0 
                 3.026 
               
               
                 S12 
                   
                 10.6835 
                 0.4000 
                   
                   
                 3.120 
               
               
                 S13 
                 Seventh Lens 
                 13.8285 
                 1.5710 
                 1.622 
                 56.3 
                 3.260 
               
               
                 S14 
                   
                 −10.8697 
                 2.7218 
                   
                   
                 3.289 
               
               
                 S15 
                 Filter 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.501 
               
               
                 S16 
                   
                 Infinity 
                 0.5500 
                   
                   
                 3.520 
               
               
                 S17 
                 Cover Glass 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.559 
               
               
                 S18 
                   
                 Infinity 
                 3.4997 
                   
                   
                 3.577 
               
               
                 S19 
                 Imaging Plane 
                 Infinity 
                 0.0000 
                   
                   
                 3.827 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 12 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
               
               
                 No. 
                 S3 
                 S4 
                 S5 
                 S6 
                 S13 
                 S14 
               
               
                   
               
             
            
               
                 k 
                 −1.37430E+00 
                 −2.73477E+00 
                 −2.34952E−01 
                 −4.88088E+01 
                 0.00000E+00 
                 0.00000E+00 
               
               
                 A 
                  2.80317E−03 
                  2.45675E−03 
                 −5.35972E−05 
                 −1.24562E−04 
                 3.38486E−04 
                 1.27979E−03 
               
               
                 B 
                 −1.36388E−04 
                 −3.08647E−05 
                  2.75344E−05 
                  5.58890E−05 
                 3.13715E−05 
                 3.51918E−05 
               
               
                 C 
                  3.24503E−06 
                 −7.22831E−07 
                 −1.18602E−08 
                 −6.94896E−07 
                 1.04575E−06 
                 2.25264E−06 
               
               
                 D 
                 −1.22944E−07 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 E 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 F 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 G 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 H 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 J 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
       FIG.  13    is a diagram illustrating a seventh embodiment of an imaging lens system, and  FIG.  14    is aberration curves of the imaging lens system illustrated in  FIG.  13   . 
     Referring to  FIG.  13   , an imaging lens system  700  may include a first lens  710 , a second lens  720 , a third lens  730 , a fourth lens  740 , a fifth lens  750 , a sixth lens  760 , and a seventh lens  770 . 
     The first lens  710  may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens  720  may have a negative refractive power, and may have a concave object-side surface and a convex image-side surface. The third lens  730  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The fourth lens  740  may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. The fifth lens  750  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The sixth lens  760  may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens  770  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the image-side surface of the seventh lens  770 . The fifth lens  750  and the sixth lens  760  may be bonded to each other. In greater detail, a radius of curvature of the image-side surface of the fifth lens  750  and a radius of curvature of the object-side surface of the sixth lens  760  may be configured to be substantially the same, and the image-side surface of the fifth lens  750  may be in contact with the object-side surface of the sixth lens  760  in a center of the optical axis. 
     The imaging lens system  700  may further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the fourth lens  740  and the fifth lens  750 , and the filter IF and the cover glass CG may be disposed between the seventh lens  770  and the imaging plane IP. The imaging plane IP may be formed at a position at which light incident through the first lens  710  to the seventh lens  770  is focused. For example, the imaging plane IP may be formed on one surface of an image sensor IS of a camera module or within the image sensor IS. 
     Tables 13 and 14 below list the lens properties and aspherical values of the seventh embodiment of the imaging lens system. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 13 
               
               
                   
               
               
                 Surface 
                   
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe 
                 Effective 
               
               
                 No. 
                 Component 
                 Curvature 
                 Distance 
                 Index 
                 Number 
                 Radius 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 S1 
                 First Lens 
                 16.1626 
                 0.6000 
                 1.777 
                 49.6 
                 4.895 
               
               
                 S2 
                   
                 4.3633 
                 4.7502 
                   
                   
                 3.633 
               
               
                 S3 
                 Second Lens 
                 −3.6903 
                 1.5571 
                 1.798 
                 31.9 
                 3.120 
               
               
                 S4 
                   
                 −7.5730 
                 0.6000 
                   
                   
                 3.386 
               
               
                 S5 
                 Third Lens 
                 7.1387 
                 1.7514 
                 1.753 
                 26.8 
                 3.673 
               
               
                 S6 
                   
                 −29.5482 
                 0.4968 
                   
                   
                 3.553 
               
               
                 S7 
                 Fourth Lens 
                 −17.0790 
                 1.6585 
                 1.501 
                 80.6 
                 3.465 
               
               
                 S8 
                   
                 −9.1529 
                 0.0000 
                   
                   
                 3.259 
               
               
                 S9 
                 Stop 
                 Infinity 
                 0.3000 
                   
                   
                 2.965 
               
               
                 S10 
                 Fifth Lens 
                 9.2570 
                 2.6240 
                 1.640 
                 54.3 
                 3.094 
               
               
                 S11 
                 Sixth Lens 
                 −4.1184 
                 0.6000 
                 1.777 
                 24.8 
                 3.059 
               
               
                 S12 
                   
                 10.1395 
                 0.4000 
                   
                   
                 3.163 
               
               
                 S13 
                 Seventh Lens 
                 12.4033 
                 1.6378 
                 1.697 
                 49.6 
                 3.338 
               
               
                 S14 
                   
                 −12.6823 
                 2.7218 
                   
                   
                 3.337 
               
               
                 S15 
                 Filter 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.528 
               
               
                 S16 
                   
                 Infinity 
                 0.5500 
                   
                   
                 3.545 
               
               
                 S17 
                 Cover Glass 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.581 
               
               
                 S18 
                   
                 Infinity 
                 3.4524 
                   
                   
                 3.598 
               
               
                 S19 
                 Imaging Plane 
                 Infinity 
                 0.0000 
                   
                   
                 3.827 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 14 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
               
               
                 No. 
                 S3 
                 S4 
                 S5 
                 S6 
                 S13 
                 S14 
               
               
                   
               
             
            
               
                 k 
                 −1.42428E+00 
                 −3.19630E+00 
                 −2.14262E−01 
                 −6.84015E+01 
                 0.00000E+00 
                 0.00000E+00 
               
               
                 A 
                  2.86234E−03 
                  2.51994E−03 
                 −4.01721E−05 
                 −1.43060E−04 
                 4.94696E−04 
                 1.32352E−03 
               
               
                 B 
                 −1.45168E−04 
                 −3.49901E−05 
                  2.55250E−05 
                  5.27135E−05 
                 3.00677E−05 
                 3.62756E−05 
               
               
                 C 
                  3.61538E−06 
                 −5.74516E−07 
                  4.18969E−08 
                 −6.10374E−07 
                 9.45284E−07 
                 2.22051E−06 
               
               
                 D 
                 −1.31695E−07 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 E 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 F 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 G 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 H 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 J 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
       FIG.  15    is a diagram illustrating an eighth embodiment of an imaging lens system, and  FIG.  16    is aberration curves of the imaging lens system illustrated in  FIG.  15   . 
     Referring to  FIG.  15   , an imaging lens system  800  may include a first lens  810 , a second lens  820 , a third lens  830 , a fourth lens  840 , a fifth lens  850 , a sixth lens  860 , and a seventh lens  870 . 
     The first lens  810  may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens  820  may have a negative refractive power, and may have a concave object-side surface and a convex image-side surface. The third lens  830  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The fourth lens  840  may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. The fifth lens  850  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The sixth lens  860  may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens  870  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the image-side surface of the seventh lens  870 . The fifth lens  850  and the sixth lens  860  may be bonded to each other. In greater detail, a radius of curvature of the image-side surface of the fifth lens  850  and a radius of curvature of the object-side surface of the sixth lens  860  may be configured to be substantially the same, and the image-side surface of the fifth lens  850  may be in contact with the object-side surface of the sixth lens  860  in a center of the optical axis. 
     The imaging lens system  800  may further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the fourth lens  840  and the fifth lens  850 , and the filter IF and the cover glass CG may be disposed between the seventh lens  870  and the imaging plane IP. The imaging plane IP may be formed at a position at which light incident through the first lens  810  to the seventh lens  870  is focused. For example, the imaging plane IP may be formed on one surface of an image sensor IS of a camera module or within the image sensor IS. 
     Tables 15 and 16 below list the lens properties and aspherical values of the eighth embodiment of the imaging lens system. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 15 
               
               
                   
               
               
                 Surface 
                   
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe 
                 Effective 
               
               
                 No. 
                 Component 
                 Curvature 
                 Distance 
                 Index 
                 Number 
                 Radius 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 S1 
                 First Lens 
                 15.0650 
                 0.6000 
                 1.777 
                 49.6 
                 4.938 
               
               
                 S2 
                   
                 4.3982 
                 4.7494 
                   
                   
                 3.673 
               
               
                 S3 
                 Second Lens 
                 −3.8361 
                 1.5971 
                 1.872 
                 32.5 
                 3.110 
               
               
                 S4 
                   
                 −8.2125 
                 0.6000 
                   
                   
                 3.359 
               
               
                 S5 
                 Third Lens 
                 7.1102 
                 1.7223 
                 1.772 
                 26.9 
                 3.664 
               
               
                 S6 
                   
                 −29.8213 
                 0.4878 
                   
                   
                 3.550 
               
               
                 S7 
                 Fourth Lens 
                 −17.3620 
                 1.7015 
                 1.500 
                 81.0 
                 3.464 
               
               
                 S8 
                   
                 −9.2978 
                 0.0000 
                   
                   
                 3.249 
               
               
                 S9 
                 Stop 
                 Infinity 
                 0.3000 
                   
                   
                 2.965 
               
               
                 S10 
                 Fifth Lens 
                 9.2182 
                 2.6927 
                 1.647 
                 53.6 
                 3.097 
               
               
                 S11 
                 Sixth Lens 
                 −4.0666 
                 0.6000 
                 1.784 
                 24.5 
                 3.061 
               
               
                 S12 
                   
                 9.9762 
                 0.4000 
                   
                   
                 3.171 
               
               
                 S13 
                 Seventh Lens 
                 13.1196 
                 1.5210 
                 1.758 
                 45.9 
                 3.346 
               
               
                 S14 
                   
                 −13.2757 
                 2.7218 
                   
                   
                 3.337 
               
               
                 S15 
                 Filter 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.527 
               
               
                 S16 
                   
                 Infinity 
                 0.5500 
                   
                   
                 3.544 
               
               
                 S17 
                 Cover Glass 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.580 
               
               
                 S18 
                   
                 Infinity 
                 3.4565 
                   
                   
                 3.598 
               
               
                 S19 
                 Imaging Plane 
                 Infinity 
                 0.0000 
                   
                   
                 3.826 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 16 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
               
               
                 No. 
                 S3 
                 S4 
                 S5 
                 S6 
                 S13 
                 S14 
               
               
                   
               
             
            
               
                 k 
                 −1.46074E+00 
                 −3.43384E+00 
                 −2.20716E−01 
                 −7.80143E+01 
                 0.00000E+00 
                 0.00000E+00 
               
               
                 A 
                  2.91563E−03 
                  2.55480E−03 
                 −4.12789E−05 
                 −1.53185E−04 
                 5.91838E−04 
                 1.32233E−03 
               
               
                 B 
                 −1.46012E−04 
                 −3.50124E−05 
                  2.40618E−05 
                  5.12545E−05 
                 2.94577E−05 
                 3.80176E−05 
               
               
                 C 
                  3.70225E−06 
                 −4.37633E−07 
                  7.48676E−08 
                 −5.80952E−07 
                 1.00705E−06 
                 2.22702E−06 
               
               
                 D 
                 −1.14625E−07 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 E 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 F 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 G 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 H 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 J 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
       FIG.  17    is a diagram illustrating a ninth embodiment of an imaging lens system, and  FIG.  18    is aberration curves of the imaging lens system illustrated in  FIG.  17   . 
     Referring to  FIG.  17   , an imaging lens system  900  may include a first lens  910 , a second lens  920 , a third lens  930 , a fourth lens  940 , a fifth lens  950 , a sixth lens  960 , and a seventh lens  970 . 
     The first lens  910  may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens  920  may have a negative refractive power, and may have a concave object-side surface and a convex image-side surface. The third lens  930  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The fourth lens  940  may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. The fifth lens  950  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The sixth lens  960  may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens  970  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the image-side surface of the seventh lens  970 . The fifth lens  950  and the sixth lens  960  may be bonded to each other. In greater detail, a radius of curvature of the image-side surface of the fifth lens  950  and a radius of curvature of the object-side surface of the sixth lens  960  may be configured to be substantially the same, and the image-side surface of the fifth lens  950  may be in contact with the object-side surface of the sixth lens  960  in a center of the optical axis. 
     The imaging lens system  900  may further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the fourth lens  940  and the fifth lens  950 , and the filter IF and the cover glass CG may be disposed between the seventh lens  970  and the imaging plane IP. The imaging plane IP may be formed at a position at which light incident through the first lens  910  to the seventh lens  970  is focused. For example, the imaging plane IP may be formed on one surface of an image sensor IS of a camera module or within the image sensor IS. 
     Tables 17 and 18 below list the lens properties and aspherical values of the ninth embodiment of the imaging lens system. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 17 
               
               
                   
               
               
                 Surface 
                   
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe 
                 Effective 
               
               
                 No. 
                 Component 
                 Curvature 
                 Distance 
                 Index 
                 Number 
                 Radius 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 S1 
                 First Lens 
                 17.3122 
                 0.6000 
                 1.719 
                 48.1 
                 4.995 
               
               
                 S2 
                   
                 4.3799 
                 4.6314 
                   
                   
                 3.673 
               
               
                 S3 
                 Second Lens 
                 −3.9437 
                 1.5894 
                 1.883 
                 34.6 
                 3.149 
               
               
                 S4 
                   
                 −8.6781 
                 0.6000 
                   
                   
                 3.398 
               
               
                 S5 
                 Third Lens 
                 7.1248 
                 1.8038 
                 1.779 
                 26.9 
                 3.739 
               
               
                 S6 
                   
                 −29.8527 
                 0.4328 
                   
                   
                 3.616 
               
               
                 S7 
                 Fourth Lens 
                 −17.4933 
                 1.7703 
                 1.499 
                 81.6 
                 3.557 
               
               
                 S8 
                   
                 −9.2736 
                 0.0000 
                   
                   
                 3.341 
               
               
                 S9 
                 Stop 
                 Infinity 
                 0.3000 
                   
                   
                 2.965 
               
               
                 S10 
                 Fifth Lens 
                 9.3357 
                 2.6629 
                 1.654 
                 53.0 
                 3.150 
               
               
                 S11 
                 Sixth Lens 
                 −4.0851 
                 0.6000 
                 1.790 
                 24.3 
                 3.116 
               
               
                 S12 
                   
                 10.3206 
                 0.4000 
                   
                   
                 3.227 
               
               
                 S13 
                 Seventh Lens 
                 13.2137 
                 1.5968 
                 1.777 
                 44.9 
                 3.412 
               
               
                 S14 
                   
                 −13.8555 
                 2.7218 
                   
                   
                 3.386 
               
               
                 S15 
                 Filter 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.557 
               
               
                 S16 
                   
                 Infinity 
                 0.5500 
                   
                   
                 3.572 
               
               
                 S17 
                 Cover Glass 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.605 
               
               
                 S18 
                   
                 Infinity 
                 3.4409 
                   
                   
                 3.620 
               
               
                 S19 
                 Imaging Plane 
                 Infinity 
                 0.0000 
                   
                   
                 3.826 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 18 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
               
               
                 No. 
                 S3 
                 S4 
                 S5 
                 S6 
                 S13 
                 S14 
               
               
                   
               
             
            
               
                 k 
                 −1.46450E+00 
                 −3.65234E+00 
                 −2.20978E−01 
                 −8.73938E+01 
                 0.00000E+00 
                 0.00000E+00 
               
               
                 A 
                  2.90752E−03 
                  2.56648E−03 
                 −4.08368E−05 
                 −1.57674E−04 
                 6.35293E−04 
                 1.33318E−03 
               
               
                 B 
                 −1.50550E−04 
                 −3.89931E−05 
                  2.33950E−05 
                  5.08818E−05 
                 2.96639E−05 
                 3.80317E−05 
               
               
                 C 
                  3.94211E−06 
                 −2.66328E−07 
                  8.20802E−08 
                 −5.50635E−07 
                 9.00507E−07 
                 2.15142E−06 
               
               
                 D 
                 −1.16696E−07 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 E 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 F 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 G 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 H 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 J 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
       FIG.  19    is a diagram illustrating a tenth embodiment of an imaging lens system, and  FIG.  20    is aberration curves of the imaging lens system illustrated in  FIG.  19   . 
     Referring to  FIG.  19   , an imaging lens system  1000  may include a first lens  1010 , a second lens  1020 , a third lens  1030 , a fourth lens  1040 , a fifth lens  1050 , a sixth lens  1060 , and a seventh lens  1070 . 
     The first lens  1010  may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens  1020  may have a negative refractive power, and may have a concave object-side surface and a convex image-side surface. The third lens  1030  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The fourth lens  1040  may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. The fifth lens  1050  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The sixth lens  1060  may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens  1070  may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the image-side surface of the seventh lens  1070 . The fifth lens  1050  and the sixth lens  1060  may be bonded to each other. In greater detail, a radius of curvature of the image-side surface of the fifth lens  1050  and a radius of curvature of the object-side surface of the sixth lens  1060  may be configured to be substantially the same, and the image-side surface of the fifth lens  1050  may be in contact with the object-side surface of the sixth lens  1060  in a center of the optical axis. 
     The imaging lens system  1000  may further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the fourth lens  1040  and the fifth lens  1050 , and the filter IF and the cover glass CG may be disposed between the seventh lens  1070  and the imaging plane IP. The imaging plane IP may be formed at a position at which light incident through the first lens  1010  to the seventh lens  1070  is focused. For example, the imaging plane IP may be formed on one surface of an image sensor IS of a camera module or within the image sensor IS. 
     Tables 19 and 20 below list the lens properties and aspherical values of the tenth embodiment of the imaging lens system. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 19 
               
               
                   
               
               
                 Surface 
                   
                 Radius of 
                 Thickness/ 
                 Refractive 
                 Abbe 
                 Effective 
               
               
                 No. 
                 Component 
                 Curvature 
                 Distance 
                 Index 
                 Number 
                 Radius 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 S1 
                 First Lens 
                 24.7568 
                 0.6000 
                 1.501 
                 80.8 
                 5.427 
               
               
                 S2 
                   
                 4.1322 
                 4.5937 
                   
                   
                 3.708 
               
               
                 S3 
                 Second Lens 
                 −4.6651 
                 1.9139 
                 1.907 
                 25.8 
                 3.174 
               
               
                 S4 
                   
                 −13.2240 
                 0.6103 
                   
                   
                 3.337 
               
               
                 S5 
                 Third Lens 
                 7.0710 
                 1.7364 
                 1.774 
                 24.8 
                 3.590 
               
               
                 S6 
                   
                 −32.4107 
                 0.2951 
                   
                   
                 3.465 
               
               
                 S7 
                 Fourth Lens 
                 −15.9122 
                 1.6996 
                 1.499 
                 81.6 
                 3.459 
               
               
                 S8 
                   
                 −9.0263 
                 0.0000 
                   
                   
                 3.255 
               
               
                 S9 
                 Stop 
                 Infinity 
                 0.3000 
                   
                   
                 2.965 
               
               
                 S10 
                 Fifth Lens 
                 9.4940 
                 2.7559 
                 1.661 
                 52.4 
                 3.120 
               
               
                 S11 
                 Sixth Lens 
                 −4.0538 
                 0.6000 
                 1.786 
                 24.4 
                 3.095 
               
               
                 S12 
                   
                 9.8804 
                 0.4411 
                   
                   
                 3.233 
               
               
                 S13 
                 Seventh Lens 
                 12.2028 
                 1.7283 
                 1.889 
                 40.8 
                 3.475 
               
               
                 S14 
                   
                 −16.8499 
                 2.7218 
                   
                   
                 3.414 
               
               
                 S15 
                 Filter 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.577 
               
               
                 S16 
                   
                 Infinity 
                 0.5500 
                   
                   
                 3.593 
               
               
                 S17 
                 Cover Glass 
                 Infinity 
                 0.4000 
                 1.519 
                 64.2 
                 3.625 
               
               
                 S18 
                   
                 Infinity 
                 3.1540 
                   
                   
                 3.640 
               
               
                 S19 
                 Imaging Plane 
                 Infinity 
                 0.0000 
                   
                   
                 3.827 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 20 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
                   
                   
               
               
                 No. 
                 S3 
                 S4 
                 S5 
                 S6 
                 S13 
                 S14 
               
               
                   
               
             
            
               
                 k 
                 −1.40701E+00 
                 −4.13654E+00 
                 −2.42329E−01  
                 −9.42803E+01 
                 0.00000E+00 
                 0.00000E+00 
               
               
                 A 
                  2.84216E−03 
                  2.56955E−03 
                 −5.12652E−05  
                 −1.92022E−04 
                 6.42895E−04 
                 1.28000E−03 
               
               
                 B 
                 −1.54505E−04 
                 −4.87954E−05 
                 2.23483E−05 
                  4.93296E−05 
                 3.26155E−05 
                 3.96969E−05 
               
               
                 C 
                  4.27883E−06 
                 −1.36039E−07 
                 2.01660E−07 
                 −3.63703E−07 
                 5.03002E−07 
                 2.07459E−06 
               
               
                 D 
                 −1.18726E−07 
                 0 
                 0.00000E+00 
                 0 
                 0 
                 0 
               
               
                 E 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 F 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 G 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 H 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                 J 
                 0 
                 0 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
     Tables 21 and 22 below list optical properties values and conditional expression values of the first to tenth embodiments of the imaging lens system. 
     
       
         
           
               
               
               
               
               
               
             
               
                 TABLE 21 
               
               
                   
               
             
            
               
                 Optical 
                 First 
                 Second 
                 Third 
                 Fourth 
                 Fifth 
               
               
                 Property 
                 Embodiment 
                 Embodiment 
                 Embodiment 
                 Embodiment 
                 Embodiment 
               
               
                   
               
               
                 f1 
                 −7.1256 
                 −7.0064 
                 −7.3336 
                 −8.2002 
                 −7.6772 
               
               
                 f2 
                 −13.8020 
                 −15.1107 
                 −12.4067 
                 −10.1548 
                 −10.9312 
               
               
                 f3 
                 8.8748 
                 9.2828 
                 8.2538 
                 8.0920 
                 7.7917 
               
               
                 f4 
                 39.9779 
                 41.6546 
                 36.3387 
                 43.1035 
                 31.6156 
               
               
                 f5 
                 4.7860 
                 5.8456 
                 5.3083 
                 5.1727 
                 4.8947 
               
               
                 f6 
                 −3.2516 
                 −3.8834 
                 −3.6850 
                 −3.6060 
                 −3.9860 
               
               
                 f7 
                 7.0469 
                 7.0593 
                 7.7607 
                 7.2968 
                 10.7948 
               
               
                 TTL 
                 24.5000 
                 24.4973 
                 24.4970 
                 24.5000 
                 24.5004 
               
               
                 BFL 
                 7.8769 
                 7.8799 
                 7.7010 
                 7.6387 
                 7.3664 
               
               
                 f 
                 4.5301 
                 4.5625 
                 4.5030 
                 4.4610 
                 4.4950 
               
               
                 f-number 
                 1.8718 
                 1.8714 
                 1.8000 
                 1.8000 
                 1.8000 
               
               
                 ImgH 
                 3.3250 
                 3.6250 
                 3.6250 
                 3.6250 
                 3.6250 
               
               
                 HFOV 
                 82.0000 
                 82.0000 
                 82.0000 
                 82.0000 
                 81.9900 
               
               
                 DFOV 
                 100.9800 
                 101.5000 
                 100.5900 
                 100.0000 
                 100.4600 
               
               
                 f56 
                 −20.2397 
                 −21.7682 
                 −23.3670 
                 −25.6419 
                 −81.8220 
               
               
                   
               
               
                 Optical 
                 Sixth 
                 Seventh 
                 Eighth 
                 Ninth 
                 Tenth 
               
               
                 Property 
                 Embodiment 
                 Embodiment 
                 Embodiment 
                 Embodiment 
                 Embodiment 
               
               
                   
               
               
                 f1 
                 −7.8477 
                 −7.8710 
                 −8.2002 
                 −8.3139 
                 −9.9994 
               
               
                 f2 
                 −10.8328 
                 −10.9777 
                 −9.9482 
                 −9.7160 
                 −8.8899 
               
               
                 f3 
                 7.7944 
                 7.7934 
                 7.5941 
                 7.5498 
                 7.6482 
               
               
                 f4 
                 34.3946 
                 36.7654 
                 37.3819 
                 36.9288 
                 38.6505 
               
               
                 f5 
                 4.8484 
                 4.8221 
                 4.7379 
                 4.7143 
                 4.6783 
               
               
                 f6 
                 −3.8274 
                 −3.7022 
                 −3.6184 
                 −3.6359 
                 −3.5872 
               
               
                 f7 
                 10.0307 
                 9.2510 
                 8.9224 
                 8.9317 
                 8.1930 
               
               
                 TTL 
                 24.5000 
                 24.5000 
                 24.5000 
                 24.5000 
                 24.5000 
               
               
                 BFL 
                 7.5714 
                 7.5242 
                 7.5283 
                 7.5127 
                 7.2258 
               
               
                 f 
                 4.4764 
                 4.4741 
                 4.4642 
                 4.4856 
                 4.5171 
               
               
                 f-number 
                 1.8122 
                 1.7800 
                 1.7690 
                 1.7690 
                 1.6944 
               
               
                 ImgH 
                 3.6250 
                 3.6250 
                 3.6250 
                 3.6250 
                 3.6250 
               
               
                 HFOV 
                 82.0000 
                 82.0000 
                 82.0000 
                 82.0000 
                 82.0000 
               
               
                 DFOV 
                 94.6600 
                 100.2000 
                 100.0700 
                 100.3600 
                 94.9900 
               
               
                 f56 
                 −47.3826 
                 −36.3797 
                 −35.7203 
                 −37.8010 
                 −36.8699 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
             
               
                 TABLE 22 
               
               
                   
               
             
            
               
                 Conditional 
                 First 
                 Second 
                 Third 
                 Fourth 
                 Fifth 
               
               
                 Expression 
                 Embodiment 
                 Embodiment 
                 Embodiment 
                 Embodiment 
                 Embodiment 
               
               
                   
               
               
                 ImgH/TTL 
                 0.13571 
                 0.14798 
                 0.14798 
                 0.14796 
                 0.14796 
               
               
                 TTL/f 
                 5.40827 
                 5.36928 
                 5.44015 
                 5.49204 
                 5.45059 
               
               
                 |f/f3| 
                 0.51045 
                 0.49150 
                 0.54557 
                 0.55128 
                 0.57690 
               
               
                 L1ER1/TTL 
                 0.38303 
                 0.38433 
                 0.39097 
                 0.40589 
                 0.29818 
               
               
                 f2/f3 
                 −1.55520 
                 −1.62781 
                 −1.50315 
                 −1.25491 
                 −1.40293 
               
               
                 f5/f6 
                 −1.47189 
                 −1.50527 
                 −1.44053 
                 −1.43445 
                 −1.22796 
               
               
                 L1ER1/ImgH 
                 2.82233 
                 2.59726 
                 2.64212 
                 2.74327 
                 2.01531 
               
               
                 |V5-V6| 
                 32.46100 
                 33.68000 
                 31.72500 
                 32.29300 
                 30.52800 
               
               
                 D34/D12 
                 0.03851 
                 0.12972 
                 0.10539 
                 0.13332 
                 0.13076 
               
               
                 D34/D45 
                 0.63547 
                 2.09163 
                 1.80316 
                 2.27265 
                 2.16562 
               
               
                 ImgH/f 
                 0.73398 
                 0.79452 
                 0.80502 
                 0.81260 
                 0.80645 
               
               
                 SumNd/7 
                 1.66210 
                 1.64237 
                 1.68099 
                 1.71420 
                 1.70767 
               
               
                 SumV/SumNd 
                 26.72196 
                 28.48703 
                 26.44418 
                 25.69645 
                 25.61952 
               
               
                 (R6 + R7)/(R6 − R7) 
                 4.87355 
                 4.29882 
                 5.13149 
                 4.65969 
                 3.16039 
               
               
                 (R8 + R9)/(R8 − R9) 
                 0.20760 
                 0.16800 
                 0.06893 
                 0.11547 
                 0.05305 
               
               
                 L1ER1/HFOV 
                 0.11444 
                 0.11482 
                 0.11680 
                 0.12127 
                 0.08910 
               
               
                   
               
               
                 Conditional 
                 Sixth 
                 Seventh 
                 Eighth 
                 Ninth 
                 Tenth 
               
               
                 Expression 
                 Embodiment 
                 Embodiment 
                 Embodiment 
                 Embodiment 
                 Embodiment 
               
               
                   
               
               
                 ImgH/TTL 
                 0.14796 
                 0.14796 
                 0.14796 
                 0.14796 
                 0.14796 
               
               
                 TTL/f 
                 5.47315 
                 5.47596 
                 5.48811 
                 5.46193 
                 5.42383 
               
               
                 |f/f3| 
                 0.57431 
                 0.57409 
                 0.58785 
                 0.59414 
                 0.59061 
               
               
                 L1ER1/TTL 
                 0.39964 
                 0.39955 
                 0.40314 
                 0.40778 
                 0.44306 
               
               
                 f2/f3 
                 −1.38981 
                 −1.40858 
                 −1.31000 
                 −1.28692 
                 −1.16236 
               
               
                 f5/f6 
                 −1.26676 
                 −1.30249 
                 −1.30940 
                 −1.29658 
                 −1.30417 
               
               
                 L1ER1/ImgH 
                 2.70104 
                 2.70043 
                 2.72466 
                 2.75601 
                 2.99445 
               
               
                 |V5-V6| 
                 30.20800 
                 29.55700 
                 29.08700 
                 28.64300 
                 27.93200 
               
               
                 D34/D12 
                 0.13016 
                 0.10458 
                 0.10272 
                 0.09346 
                 0.06424 
               
               
                 D34/D45 
                 2.12745 
                 1.65597 
                 1.62615 
                 1.44277 
                 0.98367 
               
               
                 ImgH/f 
                 0.80980 
                 0.81022 
                 0.81202 
                 0.80814 
                 0.80251 
               
               
                 SumNd/7 
                 1.70374 
                 1.70603 
                 1.72994 
                 1.72874 
                 1.71664 
               
               
                 SumV/SumNd 
                 25.68672 
                 26.59334 
                 25.93273 
                 25.89718 
                 27.51017 
               
               
                 (R6 + R7)/(R6 − R7) 
                 3.52513 
                 3.73940 
                 3.78700 
                 3.83079 
                 2.92893 
               
               
                 (R8 + R9)/(R8 − R9) 
                 0.02325 
                 −0.00566 
                 0.00430 
                 −0.00333 
                 −0.02526 
               
               
                 L1ER1/HFOV 
                 0.11941 
                 0.11938 
                 0.12045 
                 0.12184 
                 0.13238 
               
               
                   
               
            
           
         
       
     
     The embodiments described above may provide an imaging lens system that may provide a small f-number without excessively increasing sizes of lenses and a high resolution. 
     While this disclosure includes specific examples, it will be apparent after an understanding of the disclosure of this application that various changes in form and details may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only, and not for purposes of limitation. Descriptions of features or aspects in each example are to be considered as being applicable to similar features or aspects in other examples. Suitable results may be achieved if the described techniques are performed in a different order, and/or if components in a described system, architecture, device, or circuit are combined in a different manner, and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the disclosure is defined not by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.