Patent Publication Number: US-11385443-B2

Title: Optical imaging lens

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of China application serial no. 201911111733.1, filed on Nov. 14, 2019. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
     TECHNICAL FIELD 
     The invention relates to an optical element, and more particularly, to an optical imaging lens. 
     BACKGROUND 
     In recent years, optical imaging lenses have evolved and are being applied in a wider range. In addition to requiring a large aperture of the lens and maintaining a short system length, there are also increasing demands for high pixels and high resolution. High pixels imply that an image height of the lens needs to be increased by using a larger image sensor to receive imaging rays to satisfy the demand for high pixels. However, even though the large aperture is designed to enable the lens to receive more imaging rays, high pixels will require even higher resolution of the lens in order to handle more and complex imaging rays. Therefore, how to add multiple lenses to the limited system length while increasing the resolution, the aperture and the image height is a design challenge of the optical imaging lens as well as a problem to be solved. 
     SUMMARY 
     The invention provides an optical imaging lens having a shorter system length, a larger aperture (with smaller Fno value) and a larger image height. 
     An embodiment of the invention provides an optical imaging lens, which includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element sequentially along an optical axis from an object side to an image side. Each of the first lens element to the seventh lens element includes an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing the imaging rays to pass through. A periphery region of the image-side surface of the first lens element is convex. A periphery region of the image-side surface of the third lens element is concave. The fourth lens element has positive refracting power. An optical axis region of the image-side surface of the fifth lens element is concave. An optical axis region of the image-side surface of the sixth lens element is concave. The optical imaging lens includes only the first lens element to the seventh lens element as lens elements having refracting power, and satisfies the following condition expression: (G67+T7)/(T1+T2)≥1.600, wherein G67 is an air gap from the sixth lens element to the seventh lens element along the optical axis, T1 is a thickness of the first lens element along the optical axis, T2 is a thickness of the second lens element along the optical axis, and T7 is a thickness of the seventh lens element along the optical axis. 
     An embodiment of the invention provides an optical imaging lens, which includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element sequentially along an optical axis from an object side to an image side. Each of the first lens element to the seventh lens element includes an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing the imaging rays to pass through. A periphery region of the image-side surface of the third lens element is concave. The fourth lens element has positive refracting power, and a periphery region of the object-side surface of the fourth lens element is concave. An optical axis region of the image-side surface of the fifth lens element is concave. An optical axis region of the image-side surface of the sixth lens element is concave. An optical axis region of the object-side surface of the seventh lens element is convex. The optical imaging lens includes only the first lens element to the seventh lens element as lens elements having refracting power, and satisfies the following condition expression: (G67+T7)/(T1+T2)≥1.600, wherein G67 is an air gap from the sixth lens element to the seventh lens element along the optical axis, T1 is a thickness of the first lens element along the optical axis, T2 is a thickness of the second lens element along the optical axis, and T7 is a thickness of the seventh lens element along the optical axis. 
     An embodiment of the invention provides an optical imaging lens, which includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element sequentially along an optical axis from an object side to an image side. Each of the first lens element to the seventh lens element includes an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing the imaging rays to pass through. A periphery region of the image-side surface of the third lens element is concave. A periphery region of the object-side surface of the fourth lens element is concave. The fifth lens element has negative refracting power, and an optical axis region of the image-side surface of the fifth lens element is concave. An optical axis region of the image-side surface of the sixth lens element is concave. An optical axis region of the object-side surface of the seventh lens element is convex. The optical imaging lens includes only the first lens element to the seventh lens element as lens elements having refracting power, and satisfies the following condition expression: (G67+T7)/(T1+T2)≥1.600, wherein G67 is an air gap from the sixth lens element to the seventh lens element along the optical axis, T1 is a thickness of the first lens element along the optical axis, T2 is a thickness of the second lens element along the optical axis, and T7 is a thickness of the seventh lens element along the optical axis. 
     Based on the above, the optical imaging lens according to the embodiment of the invention has the following advantageous effects. With the design that satisfies the concave and convex surfaces of the lens elements, the condition of the refracting power, and the design that satisfies the above conditional expressions, the optical imaging lens can have the shorter system length, the larger aperture (with smaller Fno value) and the larger image height. 
     To make the aforementioned more comprehensible, several embodiments accompanied with drawings are described in detail as follows. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view illustrating a surface structure of a lens element. 
         FIG. 2  is a schematic view illustrating a concave and convex surface structure of a lens element and a ray focal point. 
         FIG. 3  is a schematic view illustrating a surface structure of a lens element according to a first example. 
         FIG. 4  is a schematic view illustrating a surface structure of a lens element according to a second example. 
         FIG. 5  is a schematic view illustrating a surface structure of a lens element according to a third example. 
         FIG. 6  is a schematic view illustrating an optical imaging lens according to a first embodiment of the invention. 
         FIG. 7A  to  FIG. 7D  illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the first embodiment of the invention. 
         FIG. 8  shows detailed optical data of the optical imaging lens according to the first embodiment of the invention. 
         FIG. 9  shows aspheric parameters of the optical imaging lens according to the first embodiment of the invention. 
         FIG. 10  is a schematic view illustrating an optical imaging lens according to a second embodiment of the invention. 
         FIG. 11A  to  FIG. 11D  illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the second embodiment of the invention. 
         FIG. 12  shows detailed optical data of the optical imaging lens according to the second embodiment of the invention. 
         FIG. 13  shows aspheric parameters of the optical imaging lens according to the second embodiment of the invention. 
         FIG. 14  is a schematic view illustrating an optical imaging lens according to a third embodiment of the invention. 
         FIG. 15A  to  FIG. 15D  illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the third embodiment of the invention. 
         FIG. 16  shows detailed optical data of the optical imaging lens according to the third embodiment of the invention. 
         FIG. 17  shows aspheric parameters of the optical imaging lens according to the third embodiment of the invention. 
         FIG. 18  is a schematic view illustrating an optical imaging lens according to a fourth embodiment of the invention. 
         FIG. 19A  to  FIG. 19D  illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the fourth embodiment of the invention. 
         FIG. 20  shows detailed optical data of the optical imaging lens according to the fourth embodiment of the invention. 
         FIG. 21  shows aspheric parameters of the optical imaging lens according to the fourth embodiment of the invention. 
         FIG. 22  is a schematic view illustrating an optical imaging lens according to a fifth embodiment of the invention. 
         FIG. 23A  to  FIG. 23D  illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the fifth embodiment of the invention. 
         FIG. 24  shows detailed optical data of the optical imaging lens according to the fifth embodiment of the invention. 
         FIG. 25  shows aspheric parameters of the optical imaging lens according to the fifth embodiment of the invention. 
         FIG. 26  is a schematic view illustrating an optical imaging lens according to a sixth embodiment of the invention. 
         FIG. 27A  to  FIG. 27D  illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the sixth embodiment of the invention. 
         FIG. 28  shows detailed optical data of the optical imaging lens according to the sixth embodiment of the invention. 
         FIG. 29  shows aspheric parameters of the optical imaging lens according to the sixth embodiment of the invention. 
         FIG. 30  is a schematic view illustrating an optical imaging lens according to a seventh embodiment of the invention. 
         FIG. 31A  to  FIG. 31D  are diagrams illustrating longitudinal spherical aberration and other aberrations of the optical imaging lens according to the seventh embodiment. 
         FIG. 32  shows detailed optical data of the optical imaging lens according to the seventh embodiment of the invention. 
         FIG. 33  shows aspheric parameters of the optical imaging lens according to the seventh embodiment of the invention. 
         FIG. 34  is a schematic view illustrating an optical imaging lens according to an eighth embodiment of the invention. 
         FIG. 35A  to  FIG. 35D  are diagrams illustrating longitudinal spherical aberration and other aberrations of the optical imaging lens according to the eighth embodiment. 
         FIG. 36  shows detailed optical data of the optical imaging lens according to the eighth embodiment of the invention. 
         FIG. 37  shows aspheric parameters of the optical imaging lens according to the eighth embodiment of the invention. 
         FIG. 38  is a schematic view illustrating an optical imaging lens according to a ninth embodiment of the invention. 
         FIG. 39A  to  FIG. 39D  are diagrams illustrating a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the ninth embodiment. 
         FIG. 40  shows detailed optical data of the optical imaging lens according to the ninth embodiment of the invention. 
         FIG. 41  shows aspheric parameters of the optical imaging lens according to the ninth embodiment of the invention. 
         FIG. 42  and  FIG. 43  show important parameters and values in related relational expressions of the optical lens assembly according to the first to the sixth embodiments of the invention. 
         FIG. 44  and  FIG. 45  show important parameters and values in related relational expressions of the optical lens assembly according to the sixth to the ninth embodiments of the invention. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     The terms “optical axis region”, “periphery region”, “concave”, and “convex” used in this specification and claims should be interpreted based on the definition listed in the specification by the principle of lexicographer. 
     In the present disclosure, the optical system may comprise at least one lens element to receive imaging rays that are incident on the optical system over a set of angles ranging from parallel to an optical axis to a half field of view (HFOV) angle with respect to the optical axis. The imaging rays pass through the optical system to produce an image on an image plane. The term “a lens element having positive refracting power (or negative refracting power)” means that the paraxial refracting power of the lens element in Gaussian optics is positive (or negative). The term “an object-side (or image-side) surface of a lens element” refers to a specific region of that surface of the lens element at which imaging rays can pass through that specific region. Imaging rays include at least two types of rays: a chief ray Lc and a marginal ray Lm (as shown in  FIG. 1 ). An object-side (or image-side) surface of a lens element can be characterized as having several regions, including an optical axis region, a periphery region, and, in some cases, one or more intermediate regions, as discussed more fully below. 
       FIG. 1  is a radial cross-sectional view of a lens element  100 . Two referential points for the surfaces of the lens element  100  can be defined: a central point, and a transition point. The central point of a surface of a lens element is a point of intersection of that surface and the optical axis I. As illustrated in  FIG. 1 , a first central point CP 1  may be present on the object-side surface  110  of lens element  100  and a second central point CP 2  may be present on the image-side surface  120  of the lens element  100 . The transition point is a point on a surface of a lens element, at which the line tangent to that point is perpendicular to the optical axis I. The optical boundary OB of a surface of the lens element is defined as a point at which the radially outermost marginal ray Lm passing through the surface of the lens element intersects the surface of the lens element. All transition points lie between the optical axis I and the optical boundary OB of the surface of the lens element. If multiple transition points are present on a single surface, then these transition points are sequentially named along the radial direction of the surface with reference numerals starting from the first transition point. For example, the first transition point, e.g., TP 1 , (closest to the optical axis I), the second transition point, e.g., TP 2 , (as shown in  FIG. 4 ), and the Nth transition point (farthest from the optical axis I). 
     The region of a surface of the lens element from the central point to the first transition point TP 1  is defined as the optical axis region, which includes the central point. The region located radially outside of the farthest Nth transition point from the optical axis I to the optical boundary OB of the surface of the lens element is defined as the periphery region. In some embodiments, there may be intermediate regions present between the optical axis region and the periphery region, with the number of intermediate regions depending on the number of the transition points. 
     The shape of a region is convex if a collimated ray being parallel to the optical axis I and passing through the region is bent toward the optical axis I such that the ray intersects the optical axis I on the image side A 2  of the lens element. The shape of a region is concave if the extension line of a collimated ray being parallel to the optical axis I and passing through the region intersects the optical axis I on the object side A 1  of the lens element. 
     Additionally, referring to  FIG. 1 , the lens element  100  may also have a mounting portion  130  extending radially outward from the optical boundary OB. The mounting portion  130  is typically used to physically secure the lens element to a corresponding element of the optical system (not shown). Imaging rays do not reach the mounting portion  130 . The structure and shape of the mounting portion  130  are only examples to explain the technologies, and should not be taken as limiting the scope of the present disclosure. The mounting portion  130  of the lens elements discussed below may be partially or completely omitted in the following drawings. 
     Referring to  FIG. 2 , optical axis region Z 1  is defined between central point CP and first transition point TP 1 . Periphery region Z 2  is defined between TP 1  and the optical boundary OB of the surface of the lens element. Collimated ray  211  intersects the optical axis I on the image side A 2  of lens element  200  after passing through optical axis region Z 1 , i.e., the focal point of collimated ray  211  after passing through optical axis region Z 1  is on the image side A 2  of the lens element  200  at point R in  FIG. 2 . Accordingly, since the ray itself intersects the optical axis I on the image side A 2  of the lens element  200 , optical axis region Z 1  is convex. On the contrary, collimated ray  212  diverges after passing through periphery region Z 2 . The extension line EL of collimated ray  212  after passing through periphery region Z 2  intersects the optical axis I on the object side A 1  of lens element  200 , i.e., the focal point of collimated ray  212  after passing through periphery region Z 2  is on the object side A 1  at point M in  FIG. 2 . Accordingly, since the extension line EL of the ray intersects the optical axis I on the object side A 1  of the lens element  200 , periphery region Z 2  is concave. In the lens element  200  illustrated in  FIG. 2 , the first transition point TP 1  is the border of the optical axis region and the periphery region, i.e., TP 1  is the point at which the shape changes from convex to concave. 
     Alternatively, there is another way for a person having ordinary skill in the art to determine whether an optical axis region is convex or concave by referring to the sign of “Radius” (the “R” value), which is the paraxial radius of shape of a lens surface in the optical axis region. The R value is commonly used in conventional optical design software such as Zemax and CodeV. The R value usually appears in the lens data sheet in the software. For an object-side surface, a positive R value defines that the optical axis region of the object-side surface is convex, and a negative R value defines that the optical axis region of the object-side surface is concave. Conversely, for an image-side surface, a positive R value defines that the optical axis region of the image-side surface is concave, and a negative R value defines that the optical axis region of the image-side surface is convex. The result found by using this method should be consistent with the method utilizing intersection of the optical axis by rays/extension lines mentioned above, which determines surface shape by referring to whether the focal point of a collimated ray being parallel to the optical axis I is on the object-side or the image-side of a lens element. As used herein, the terms “a shape of a region is convex (concave),” “a region is convex (concave),” and “a convex- (concave-) region,” can be used alternatively. 
       FIG. 3 ,  FIG. 4  and  FIG. 5  illustrate examples of determining the shape of lens element regions and the boundaries of regions under various circumstances, including the optical axis region, the periphery region, and intermediate regions as set forth in the present specification. 
       FIG. 3  is a radial cross-sectional view of a lens element  300 . As illustrated in  FIG. 3 , only one transition point TP 1  appears within the optical boundary OB of the image-side surface  320  of the lens element  300 . Optical axis region Z 1  and periphery region Z 2  of the image-side surface  320  of lens element  300  are illustrated. The R value of the image-side surface  320  is positive (i.e., R&gt;0). Accordingly, the optical axis region Z 1  is concave. 
     In general, the shape of each region demarcated by the transition point will have an opposite shape to the shape of the adjacent region(s). Accordingly, the transition point will define a transition in shape, changing from concave to convex at the transition point or changing from convex to concave. In  FIG. 3 , since the shape of the optical axis region Z 1  is concave, the shape of the periphery region Z 2  will be convex as the shape changes at the transition point TP 1 . 
       FIG. 4  is a radial cross-sectional view of a lens element  400 . Referring to  FIG. 4 , a first transition point TP 1  and a second transition point TP 2  are present on the object-side surface  410  of lens element  400 . The optical axis region Z 1  of the object-side surface  410  is defined between the optical axis I and the first transition point TP 1 . The R value of the object-side surface  410  is positive (i.e., R&gt;0). Accordingly, the optical axis region Z 1  is convex. 
     The periphery region Z 2  of the object-side surface  410 , which is also convex, is defined between the second transition point TP 2  and the optical boundary OB of the object-side surface  410  of the lens element  400 . Further, intermediate region Z 3  of the object-side surface  410 , which is concave, is defined between the first transition point TP 1  and the second transition point TP 2 . Referring once again to  FIG. 4 , the object-side surface  410  includes an optical axis region Z 1  located between the optical axis I and the first transition point TP 1 , an intermediate region Z 3  located between the first transition point TP 1  and the second transition point TP 2 , and a periphery region Z 2  located between the second transition point TP 2  and the optical boundary OB of the object-side surface  410 . Since the shape of the optical axis region Z 1  is designed to be convex, the shape of the intermediate region Z 3  is concave as the shape of the intermediate region Z 3  changes at the first transition point TP 1 , and the shape of the periphery region Z 2  is convex as the shape of the periphery region Z 2  changes at the second transition point TP 2 . 
       FIG. 5  is a radial cross-sectional view of a lens element  500 . Lens element  500  has no transition point on the object-side surface  510  of the lens element  500 . For a surface of a lens element with no transition point, for example, the object-side surface  510  the lens element  500 , the optical axis region Z 1  is defined as the region between 0-50% of the distance between the optical axis I and the optical boundary OB of the surface of the lens element and the periphery region is defined as the region between 50%-100% of the distance between the optical axis I and the optical boundary OB of the surface of the lens element. Referring to lens element  500  illustrated in  FIG. 5 , the optical axis region Z 1  of the object-side surface  510  is defined between the optical axis I and 50% of the distance between the optical axis I and the optical boundary OB. The R value of the object-side surface  510  is positive (i.e., R&gt;0). Accordingly, the optical axis region Z 1  is convex. For the object-side surface  510  of the lens element  500 , because there is no transition point, the periphery region Z 2  of the object-side surface  510  is also convex. It should be noted that lens element  500  may have a mounting portion (not shown) extending radially outward from the periphery region Z 2 . 
       FIG. 6  is a schematic view illustrating an optical imaging lens according to a first embodiment of the invention, and  FIG. 7A  to  FIG. 7D  illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the first embodiment of the invention. Referring to  FIG. 6 , an optical imaging lens  10  in the first embodiment of the invention includes an aperture stop  0 , a first lens element  1 , a second lens element  2 , a third lens element  3 , a fourth lens element  4 , a fifth lens element  5 , a sixth lens element  6 , a seventh lens element  7  and a filter  9  sequentially along the optical axis I of the optical imaging lens  10  from the object side A 1  to the image side A 2 . When rays emitted from an object to be captured enter the optical imaging lens  10 , the rays pass through the aperture stop  0 , the first lens element  1 , the second lens element  2 , the third lens element  3 , the fourth lens element  4 , the fifth lens element  5 , the sixth lens element, the seventh lens element  7  and the filter  9 , an image may be formed on an image plane  99 . The filter  9  is disposed between an image-side surface  76  of the seventh lens element  7  and the image plane  99 . It should be noted that, the object side is one side that faces toward the object to be captured, and the image side is one side that faces toward the image plane  99 . In this embodiment, the filter may be an IR Cut Filter, but the invention is not limited thereto. 
     In this embodiment, each of the first lens element  1 , the second lens element  2 , the third lens element  3 , the fourth lens element  4 , the fifth lens element  5 , the sixth lens element  6 , the seventh lens element  7  and the filter  9  of the optical imaging lens  10  includes an object-side surface  15 ,  25 ,  35 ,  45 ,  55 ,  65 ,  75 ,  95  facing toward the object side and allowing the imaging rays to pass through and an image-side surface  16 ,  26 ,  36 ,  46 ,  56 ,  66 ,  76 ,  96  facing toward the image side and allowing the imaging rays to pass through. In this embodiment, the first lens element  1  is placed between the aperture stop  0  and the second lens element  2 . 
     The first lens element  1  has positive refracting power. The first lens element  1  is made of plastic material. An optical axis region  151  of the object-side surface  15  of the first lens element  1  is convex, and a periphery region  153  thereof is concave. An optical axis region  161  of the image-side surface  16  of the first lens element  1  is concave, and a periphery region  163  thereof is convex. In this embodiment, each of the object-side surface  15  and the image-side surface  16  of the first lens element  1  is an aspheric surface, but the invention is not limited thereto. 
     The second lens element  2  has negative refracting power. The second lens element  2  is made of plastic material. An optical axis region  251  of the object-side surface  25  of the second lens element  2  is convex, and a periphery region  253  thereof is convex. An optical axis region  261  of the image-side surface  26  of the second lens element  2  is concave, and a periphery region  263  thereof is concave. In this embodiment, each of the object-side surface  25  and the image-side surface  26  of the second lens element  2  is an aspheric surface, but the invention is not limited thereto. 
     The third lens element  3  has positive refracting power. The third lens element  3  is made of plastic material. An optical axis region  351  of the object-side surface  35  of the third lens element  3  is convex, and a periphery region  353  thereof is convex. An optical axis region  361  of the image-side surface  36  of the third lens element  3  is concave, and a periphery region  363  thereof is concave. In this embodiment, each of the object-side surface  35  and the image-side surface  36  of the third lens element  3  is an aspheric surface, but the invention is not limited thereto. 
     The fourth lens element  4  has positive refracting power. The fourth lens element  4  is made of plastic material. An optical axis region  451  of the object-side surface  45  of the fourth lens element  4  is convex, and a periphery region  453  thereof is concave. An optical axis region  461  of the image-side surface  46  of the fourth lens element  4  is concave, and a periphery region  463  thereof is convex. In this embodiment, each of the object-side surface  45  and the image-side surface  46  of the fourth lens element  4  is an aspheric surface, but the invention is not limited thereto. 
     The fifth lens element  5  has negative refracting power. The fifth lens element  5  is made of plastic material. An optical axis region  551  of the object-side surface  55  of the fifth lens element  5  is convex, and a periphery region  553  thereof is concave. An optical axis region  561  of the image-side surface  56  of the fifth lens element  5  is concave, and a periphery region  563  thereof is convex. In this embodiment, each of the object-side surface  55  and the image-side surface  56  of the fifth lens element  5  is an aspheric surface, but the invention is not limited thereto. 
     The sixth lens element  6  has positive refracting power. The sixth lens element  6  is made of plastic material. An optical axis region  651  of the object-side surface  65  of the sixth lens element  6  is convex, and a periphery region  653  thereof is concave. An optical axis region  661  of the image-side surface  66  of the sixth lens element  6  is concave, and a periphery region  663  thereof is convex. In this embodiment, each of the object-side surface  65  and the image-side surface  66  of the sixth lens element  6  is an aspheric surface, but the invention is not limited thereto. 
     The seventh lens element  7  has negative refracting power. The seventh lens element  7  is made of plastic material. An optical axis region  751  of the object-side surface  75  of the seventh lens element  7  is convex, and a periphery region  753  thereof is concave. An optical axis region  761  of the image-side surface  76  of the seventh lens element  7  is concave, and a periphery region  763  thereof is convex. In this embodiment, each of the object-side surface  75  and the image-side surface  76  of the seventh lens element  7  is an aspheric surface, but the invention is not limited thereto. 
     In this embodiment, lens elements having refracting power included by the optical imaging lens  10  are only the seven lens elements described above. 
     Other detailed optical data of the first embodiment are shown in  FIG. 8 . In the optical imaging lens  10  of the first embodiment, an overall effective focal length (EFL) is 4.393 mm (millimeter), a half field of view (HFOV) is 43.546°, a F-number (Fno) is 1.580, a system length is 5.459 mm and an image height is 4.500 mm, wherein the system length refers to a distance from the object-side surface  15  of the first lens element  1  to the image plane  99  along the optical axis I. 
     Further, in this embodiment, all of the object-side surfaces  15 ,  25 ,  35 ,  45 ,  55 ,  65 , and  75  and the image-side surfaces  16 ,  26 ,  36 ,  46 ,  56 ,  66 , and  76  of the first lens element  1 , the second lens element  2 , the third lens element  3 , the fourth lens element  4 , the fifth lens element  5 , the sixth lens element  6  and the seventh lens element  7  ( 14  surfaces in total) are the aspheric surfaces, wherein the object-side surfaces  15 ,  25 ,  35 ,  45 ,  55 ,  65  and  75  and the light input surfaces  16 ,  26 ,  36 ,  46 ,  56 ,  66  and  76  are common even a sphere surfaces. These aspheric surfaces are defined by the following equation. 
     
       
         
           
             
               
                 
                   
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     Therein,
         R: a radius of curvature of the surface of the lens element close to the optical axis I;   Z: a depth of the aspheric surface (a perpendicular distance between the point on the aspheric surface that is spaced from the optical axis I by the distance Y and a tangent plane tangent to a vertex of the aspheric surface on the optical axis I);   Y: a distance from a point on an aspheric curve to the optical axis I;   K: a conic constant;   a 2i : the 2i-th aspheric coefficient.       

     The aspheric coefficients of the object-side surface  15  of the first lens element  1  to the image-side surface  76  of the seventh lens element  7  in Equation (1) are shown in  FIG. 9 . In  FIG. 9 , a field number “15” indicates that the respective row includes the aspheric coefficients of the object-side surface  15  of the first lens element  1 , and the same applies to the rest of fields. In the present embodiment and the following embodiments, the 2i-th aspheric coefficients a 2  are all 0. 
     In addition, the relationship between the important parameters in the optical imaging lens  10  of the first embodiment is shown in  FIGS. 42 and 43 . 
     Therein,
         EFL is the effective focal length of the optical imaging lens  10 ;   HFOV is the half field of view of the optical imaging lens  10 ;   Fno is the f-number of the optical imaging lens  10 ;   ImgH is an image height of the optical imaging lens  10 ;   T1 is a thickness of the first lens element  1  along the optical axis I;   T2 is a thickness of the second lens element  2  along the optical axis I;   T3 is a thickness of the third lens element  3  along the optical axis I;   T4 is a thickness of the fourth lens element  4  along the optical axis I;   T5 is a thickness of the fifth lens element  5  along the optical axis I;   T6 is a thickness of the sixth lens element  6  along the optical axis I;   T7 is a thickness of the seventh lens element  7  along the optical axis I;   G12 is a distance from the image-side surface  16  of the first lens element  1  to the object-side surface  25  of the second lens element  2  along the optical axis I, that is, an air gap from the first lens element  1  to the second lens element  2  along the optical axis I;   G23 is a distance from the image-side surface  26  of the second lens element  2  to the object-side surface  35  of the third lens element  3  along the optical axis I, that is, an air gap from the second lens element  2  to the third lens element  3  along the optical axis I;   G34 is a distance from the image-side surface  36  of the third lens element  3  to the object-side surface  45  of the fourth lens element  4  along the optical axis I, that is, an air gap from the third lens element  3  to the fourth lens element  4  along the optical axis I;   G45 is a distance from the image-side surface  46  of the fourth lens element  4  to the object-side surface  55  of the fifth lens element  5  along the optical axis I, that is, an air gap from the fourth lens element  4  to the fifth lens element  5  along the optical axis I;   G56 is a distance from the image-side surface  56  of the fifth lens element  5  to the object-side surface  65  of the sixth lens element  6  along the optical axis I, that is, an air gap from the fifth lens element  5  to the sixth lens element  6  along the optical axis I;   G67 is a distance from the image-side surface  66  of the sixth lens element  6  to the object-side surface  75  of the seventh lens element  7  along the optical axis I, that is, an air gap from the sixth lens element  6  to the seventh lens element  7  along the optical axis I;   G7F is a distance from the image-side surface  76  of the seventh lens element  7  to the object-side surface  95  of the filter  9  along the optical axis I, that is, an air gap from the seventh lens element  7  to the filter  9  along the optical axis I;   TF is a thickness of the filter  9  along the optical axis I;   GFP is a distance from the image-side surface  95  of the filter  9  to the image plane  99  along the optical axis I, that is, an air gap from the filter  9  to the image plane  99  along the optical axis I;   TTL is a distance from the object-side surface  15  of the first lens element  1  to the image plane  99  along the optical axis I;   BFL is a distance from the image-side surface  76  of the seventh lens element  7  to the image plane  99  along the optical axis I;   AAG is a sum of six air gaps of the first lens element  1  to the seventh lens element  7  along the optical axis I, that is, a sum of the air gaps G12, G23, G34, G45, G56 and G67;   ALT is a sum of seven lens thicknesses of the first lens element  1  to the seventh lens element  7  along the optical axis I, i.e., a sum of the thicknesses T1, T2, T3, T4, T5, T6 and T7;   TL is a distance from the object-side surface  15  of the first lens element  1  to the image-side surface  76  of the seventh lens element  7  along the optical axis I;   Besides, it is further defined that:   f1 is a focal length of the first lens element  1 ;   f2 is a focal length of the second lens element  2 ;   f3 is a focal length of the third lens element  3 ;   f4 is a focal length of the fourth lens element  4 ;   f5 is a focal length of the fifth lens element  5 ;   f6 is a focal length of the sixth lens element  6 ;   f7 is a focal length of the seventh lens element  7 ;   n1 is a refractive index of the first lens element  1 ;   n2 is a refractive index of the second lens element  2 ;   n3 is a refractive index of the third lens element  3 ;   n4 is a refractive index of the fourth lens element  4 ;   n5 is a refractive index of the fifth lens element  5 ;   n6 is a refractive index of the sixth lens element  6 ;   n7 is a refractive index of the seventh lens element  7 ;   V1 is an Abbe number of the first lens element  1 , and the Abbe number may also be referred to as a dispersion coefficient;   V2 is an Abbe number of the second lens element  2 ;   V3 is an Abbe number of the third lens element  3 ;   V4 is an Abbe number of the fourth lens element  4 ;   V5 is an Abbe number of the fifth lens element  5 ;   V6 is an Abbe number of the sixth lens element  6 ; and   V7 is an Abbe number of the seventh lens element  7 ;       

     Referring to  FIG. 7A  to  FIG. 7D , the diagram of  FIG. 7A  illustrates longitudinal spherical aberration of the first embodiment; the diagrams of  FIG. 7B  and  FIG. 7C  respectively illustrate the field curvature aberration in sagittal direction and the field curvature aberration in tangential direction on the image plane  99  when wavelengths are 470 nm, 555 nm and 650 nm in the first embodiment; the diagram of  FIG. 7D  illustrates the distortion aberration on the image plane  99  when the wavelengths are 470 nm, 555 nm and 650 nm in the first embodiment. The longitudinal spherical aberration in the first embodiment is shown in  FIG. 7A , in which the curve of each wavelength is close to one another and approaches the center position, which indicates that the off-axis ray of each wavelength at different heights is concentrated around the imaging point. The skew margin of the curve of each wavelength indicates that the imaging point deviation of the off-axis ray at different heights is controlled within the range of ±0.035 mm. Therefore, it is evident that the first embodiment can significantly improve spherical aberration of the same wavelength. In addition, the curves of the three representative wavelengths are close to one another, which represents that the imaging positions of the rays with different wavelengths are concentrated. Therefore, the chromatic aberration can also be significantly improved. 
     In the two diagrams of the field curvature aberrations as illustrated in  FIG. 7B  and  FIG. 7C , the three representative wavelengths have the focal length variation within ±0.10 mm in the entire field of view, which indicates that aberration of the optical system provided by the first embodiment can be effectively eliminated. In  FIG. 7D , the diagram of distortion aberration shows that the distortion aberration in the first embodiment is maintained within the range of ±16%, which indicates that the distortion aberration in the first embodiment can comply with the imaging quality required by the optical system. Accordingly, compared to the existing optical lenses, with the system length shortened to 5.459 mm, the first embodiment can still provide a favorable imaging quality. Therefore, the first embodiment can shorten the lens length and provide a good imaging quality while maintaining favorable optical properties. 
       FIG. 10  is a schematic view illustrating an optical imaging lens according to a second embodiment of the invention, and  FIG. 11A  to  FIG. 11D  illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the second embodiment of the invention. Referring to  FIG. 10 , the optical imaging lens  10  according to the second embodiment of the invention is similar to that of the first embodiment, while the optical data, the aspheric coefficients, and the parameters of the lens elements  1 ,  2 ,  3 ,  4 ,  5 ,  6  and  7  in these two embodiments are different to some extent. In addition, in this embodiment, the periphery region  153  of the object-side surface  15  of the first lens element  1  is convex. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in  FIG. 10 . 
     Detailed optical data of the optical imaging lens  10  of the second embodiment are shown in  FIG. 12 . In the optical imaging lens  10  of the second embodiment, an overall effective focal length (EFL) is 3.884 millimeter (mm), a half field of view (HFOV) is 44.262°, an F-number (Fno) is 1.580, a system length is 5.220 mm and an image height is 4.500 mm. 
       FIG. 13  shows the aspheric coefficients of the object-side surface  15  of the first lens element  1  to the image-side surface  76  of the seventh lens element  7  in Equation (1) according to the second embodiment. 
     In addition, the relationship between the important parameters in the optical imaging lens  10  of the second embodiment is shown in  FIGS. 42 and 43 . 
     The longitudinal spherical aberration of the second embodiment is shown in  FIG. 11A , in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.07 mm. In the two diagrams of the field curvature aberrations as illustrated in  FIG. 11B  and  FIG. 11C , the three representative wavelengths have the focal length variation in sagittal direction within ±0.08 mm and the focal length variation in tangential direction within ±0.16 mm in the entire field of view. In  FIG. 11D , the diagram of distortion aberration shows that the distortion aberration in the second embodiment is maintained within the range of ±20%. 
     In view of the above description, it can be known that the system length TTL of the second embodiment is shorter than that of the first embodiment. The field curvature in sagittal direction of the second embodiment is better than that of the first embodiment. In addition, a thickness difference between the optical axis of the lens elements and the periphery region of the second embodiment is smaller than that of the first embodiment, and is thus easier to manufacture so a higher yield rate can be achieved. 
       FIG. 14  is a schematic view illustrating an optical imaging lens according to a third embodiment of the invention, and  FIG. 15A  to  FIG. 15D  illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the third embodiment of the invention. Referring to  FIG. 14 , the optical imaging lens  10  according to the third embodiment of the invention is similar to that of the first embodiment, while the optical data, the aspheric coefficients, and the parameters of the lens elements  1 ,  2 ,  3 ,  4 ,  5 ,  6  and  7  in these two embodiments are different to some extent. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in  FIG. 14 . 
     Detailed optical data of the optical imaging lens  10  of the third embodiment are shown in  FIG. 16 . In the optical imaging lens  10  of the third embodiment, an overall effective focal length (EFL) is 4.191 millimeter (mm), a half field of view (HFOV) is 45.359°, an F-number (Fno) is 1.580, a system length is 5.570 mm and an image height is 4.500 mm. 
       FIG. 17  shows the aspheric coefficients of the object-side surface  15  of the first lens element  1  to the image-side surface  76  of the seventh lens element  7  in Equation (1) according to the third embodiment. 
     In addition, the relationship between the important parameters in the optical imaging lens  10  of the third embodiment is shown in  FIGS. 42 and 43 . 
     The longitudinal spherical aberration of the third embodiment is shown in  FIG. 15A , in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.05 mm. In the two diagrams of the field curvature aberrations as illustrated in  FIG. 15B  and  FIG. 15C , the three representative wavelengths have the focal length variation within ±0.12 mm in the entire field of view. In  FIG. 15D , the diagram of distortion aberration shows that the distortion aberration in the third embodiment is maintained within the range of ±6%. 
     In view of the above description, it can be known that the distortion aberration of the third embodiment is better than that of the first embodiment. In addition, a thickness difference between the optical axis of the lens elements and the periphery region of the third embodiment is smaller than that of the first embodiment, and is thus easier to manufacture so a higher yield rate can be achieved. 
       FIG. 18  is a schematic view illustrating an optical imaging lens according to a fourth embodiment of the invention, and  FIG. 19A  to  FIG. 19D  illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the fourth embodiment of the invention. Referring to  FIG. 18 , the optical imaging lens  10  according to the fourth embodiment of the invention is similar to that of the first embodiment, while the optical data, the aspheric coefficients, and the parameters of the lens elements  1 ,  2 ,  3 ,  4 ,  5 ,  6  and  7  in these two embodiments are different to some extent. In addition, in this embodiment, the periphery region  153  of the object-side surface  15  of the first lens element  1  is convex. Refracting power of the sixth lens element  6  is negative. Refracting power of the seven lens element  7  is positive. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in  FIG. 18 . 
     Detailed optical data of the optical imaging lens  10  of the fourth embodiment are shown in  FIG. 20 . In the optical imaging lens  10  of the fourth embodiment, an overall effective focal length (EFL) is 2.967 millimeter (mm), a half field of view (HFOV) is 33.543°, an F-number (Fno) is 1.580, a system length is 6.708 mm and an image height is 4.500 mm. 
       FIG. 21  shows the aspheric coefficients of the object-side surface  15  of the first lens element  1  to the image-side surface  76  of the seventh lens element  7  in Equation (1) according to the fourth embodiment. 
     In addition, the relationship between the important parameters in the optical imaging lens  10  of the fourth embodiment is shown in  FIGS. 42 and 43 . 
     The longitudinal spherical aberration of the fourth embodiment is shown in  FIG. 19A , in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.6 mm. In the two diagrams of the field curvature aberrations as illustrated in  FIG. 19B  and  FIG. 19C , the three representative wavelengths have the focal length variation within ±0.56 mm in the entire field of view. In  FIG. 19D , the diagram of distortion aberration shows that the distortion aberration in the fourth embodiment is maintained within the range of ±110%. 
     In view of the above description, it can be known that a thickness difference between the optical axis of the lens elements and the periphery region of the fourth embodiment is smaller than that of the first embodiment, and is thus easier to manufacture so a higher yield rate can be achieved. 
       FIG. 22  is a schematic view illustrating an optical imaging lens according to a fifth embodiment of the invention, and  FIG. 23A  to  FIG. 23D  illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the fifth embodiment of the invention. Referring to  FIG. 22 , the optical imaging lens  10  according to the fifth embodiment of the invention is similar to that of the first embodiment, while the optical data, the aspheric coefficients, and the parameters of the lens elements  1 ,  2 ,  3 ,  4 ,  5 ,  6  and  7  in these two embodiments are different to some extent. In addition, in this embodiment, the periphery region  363  of the image-side surface  36  of the third lens element  3  is convex. The optical axis region  451  of the object-side surface  45  of the fourth lens element  4  is concave. The optical axis region  461  of the image-side surface  46  of the fourth lens element  4  is convex. Refracting power of the seven lens element  7  is positive. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in  FIG. 22 . 
     Detailed optical data of the optical imaging lens  10  of the fifth embodiment are shown in  FIG. 24 . In the optical imaging lens  10  of the fifth embodiment, an overall effective focal length (EFL) is 4.815 millimeter (mm), a half field of view (HFOV) is 39.667°, an F-number (Fno) is 1.580, a system length is 6.018 mm and an image height is 4.500 mm. 
       FIG. 25  shows the aspheric coefficients of the object-side surface  15  of the first lens element  1  to the image-side surface  76  of the seventh lens element  7  in Equation (1) according to the fifth embodiment. 
     In addition, the relationship between the important parameters in the optical imaging lens  10  of the fifth embodiment is shown in  FIGS. 42 and 43 . 
     The longitudinal spherical aberration of the fifth embodiment is shown in  FIG. 23A , in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.045 mm. In the two diagrams of the field curvature aberrations as illustrated in  FIG. 23B  and  FIG. 23C , the three representative wavelengths have the focal length variation within ±0.16 mm in the entire field of view. In  FIG. 23D , the diagram of distortion aberration shows that the distortion aberration in the fifth embodiment is maintained within the range of ±16%. 
     In view of the above description, it can be known that a thickness difference between the optical axis of the lens elements and the periphery region of the fifth embodiment is smaller than that of the first embodiment, and is thus easier to manufacture so a higher yield rate can be achieved. 
       FIG. 26  is a schematic view illustrating an optical imaging lens according to a sixth embodiment of the invention, and  FIG. 27A  to  FIG. 27D  illustrate a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the sixth embodiment of the invention. Referring to  FIG. 26 , the optical imaging lens  10  according to the sixth embodiment of the invention is similar to that of the first embodiment, while the optical data, the aspheric coefficients, and the parameters of the lens elements  1 ,  2 ,  3 ,  4 ,  5 ,  6  and  7  in these two embodiments are different to some extent. In addition, in this embodiment, the optical axis region  461  of the image-side surface  46  of the fourth lens element  4  is convex. The optical axis region  551  of the object-side surface  55  of the fifth lens element  5  is concave. The sixth lens element  6  has negative refracting power. The seventh lens element  7  has positive refracting power. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in  FIG. 26 . 
     Detailed optical data of the optical imaging lens  10  of the sixth embodiment are shown in  FIG. 28 . In the optical imaging lens  10  of the sixth embodiment, an overall effective focal length (EFL) is 4.149 millimeter (mm), a half field of view (HFOV) is 40.267°, an F-number (Fno) is 1.580, a system length is 5.665 mm and an image height is 4.500 mm. 
       FIG. 29  shows the aspheric coefficients of the object-side surface  15  of the first lens element  1  to the image-side surface  76  of the seventh lens element  7  in Equation (1) according to the sixth embodiment. 
     In addition, the relationship between the important parameters in the optical imaging lens  10  of the sixth embodiment is shown in  FIGS. 44 and 45 . 
     The longitudinal spherical aberration of the sixth embodiment is shown in  FIG. 27A , in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.07 mm. In the two diagrams of the field curvature aberrations as illustrated in  FIG. 27B  and  FIG. 27C , the three representative wavelengths have the focal length variation within ±0.07 mm in the entire field of view. In  FIG. 27D , the diagram of distortion aberration shows that the distortion aberration in the sixth embodiment is maintained within the range of ±30%. 
     In view of the above description, it can be known that the field curvature aberration of the sixth embodiment is better than that of the first embodiment. In addition, a thickness difference between the optical axis of the lens elements and the periphery region of the sixth embodiment is smaller than that of the first embodiment, and is thus easier to manufacture so a higher yield rate can be achieved. 
       FIG. 30  is a schematic view illustrating an optical imaging lens according to a seventh embodiment of the invention, and  FIG. 31A  to  FIG. 31D  are diagrams illustrating longitudinal spherical aberration and other aberrations of the optical imaging lens according to the seventh embodiment. Referring to  FIG. 30 , the optical imaging lens  10  according to the seventh embodiment of the invention is similar to that of the first embodiment, while the optical data, the aspheric coefficients, and the parameters of the lens elements  1 ,  2 ,  3 ,  4 ,  5 ,  6  and  7  in these two embodiments are different to some extent. In addition, in this embodiment, the sixth lens element  6  has negative refracting power. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in  FIG. 30 . 
     Detailed optical data of the optical imaging lens  10  of the seventh embodiment are shown in  FIG. 32 . In the optical imaging lens  10  of the seventh embodiment, an overall effective focal length (EFL) is 12.103 millimeter (mm), a half field of view (HFOV) is 25.943°, an F-number (Fno) is 4.550, a system length is 9.086 mm and an image height is 4.500 mm. 
       FIG. 33  shows the aspheric coefficients of the object-side surface  15  of the first lens element  1  to the image-side surface  76  of the seventh lens element  7  in Equation (1) according to the seventh embodiment. 
     In addition, the relationship between the important parameters in the optical imaging lens  10  of the seventh embodiment is shown in  FIGS. 44 and 45 . 
     The longitudinal spherical aberration of the seventh embodiment is shown in  FIG. 31A , in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.6 mm. In the two diagrams of the field curvature aberrations as illustrated  FIG. 31B  and  FIG. 31C , the three representative wavelengths have the focal length variation within ±0.6 mm in the entire field of view. In  FIG. 31D , the diagram of distortion aberration shows that the distortion aberration in the seventh embodiment is maintained within the range of ±20%. 
     In view of the above description, it can be known that a thickness difference between the optical axis of the lens elements and the periphery region of the seventh embodiment is smaller than that of the first embodiment, and is thus easier to manufacture so a higher yield rate can be achieved. 
       FIG. 34  is a schematic view illustrating an optical imaging lens according to an eighth embodiment of the invention, and  FIG. 35A  to  FIG. 35D  are diagrams illustrating longitudinal spherical aberration and other aberrations of the optical imaging lens according to the eighth embodiment. Referring to  FIG. 34 , the optical imaging lens  10  according to the eighth embodiment of the invention is similar to that of the first embodiment, while the optical data, the aspheric coefficients, and the parameters of the lens elements  1 ,  2 ,  3 ,  4 ,  5 ,  6  and  7  in these two embodiments are different to some extent. In addition, in this embodiment, the periphery region  153  of the object-side surface  15  of the first lens element  1  is convex. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in  FIG. 34 . 
     Detailed optical data of the optical imaging lens  10  of the eighth embodiment are shown in  FIG. 36 . In the optical imaging lens  10  of the eighth embodiment, an overall effective focal length (EFL) is 4.030 millimeter (mm), a half field of view (HFOV) is 46.363°, an F-number (Fno) is 1.580, a system length is 5.440 mm and an image height is 4.500 mm. 
       FIG. 37  shows the aspheric coefficients of the object-side surface  15  of the first lens element  1  to the image-side surface  76  of the seventh lens element  7  in Equation (1) according to the eighth embodiment. 
     In addition, the relationship between the important parameters in the optical imaging lens  10  of the eighth embodiment is shown in  FIGS. 44 and 45 . 
     The longitudinal spherical aberration of the eighth embodiment is shown in  FIG. 35A , in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.07 mm. In the two diagrams of the field curvature aberrations as illustrated in  FIG. 35B  and  FIG. 35C , the three representative wavelengths have the focal length variation in sagittal direction within ±0.08 mm and the focal length variation in tangential direction within ±0.16 mm in the entire field of view. In  FIG. 35D , the diagram of distortion aberration shows that the distortion aberration in the eighth embodiment is maintained within the range of ±6%. 
     In view of the above description, it can be known that the system length TTL of the eighth embodiment is shorter than that of the first embodiment. The field curvature in sagittal direction of the eighth embodiment is better than that of the first embodiment. The distortion aberration of the eighth embodiment is better than that of the first embodiment. In addition, a thickness difference between the optical axis of the lens elements and the periphery region of the eighth embodiment is smaller than that of the first embodiment, and is thus easier to manufacture so a higher yield rate can be achieved. 
       FIG. 38  is a schematic view illustrating an optical imaging lens according to a ninth embodiment of the invention, and  FIG. 39A  to  FIG. 39D  are diagrams illustrating a longitudinal spherical aberration and other aberrations of the optical imaging lens according to the ninth embodiment. Referring to  FIG. 38 , the optical imaging lens  10  according to the ninth embodiment of the invention is similar to that of the first embodiment, while the optical data, the aspheric coefficients, and the parameters of the lens elements  1 ,  2 ,  3 ,  4 ,  5 ,  6  and  7  in these two embodiments are different to some extent. In addition, in this embodiment, the periphery region  153  of the object-side surface  15  of the first lens element  1  is convex. For clear illustration, it should be noted that the same reference numbers of the optical axis regions and the periphery regions with surface shapes similar to those in the first embodiment are omitted in  FIG. 38 . 
     Detailed optical data of the optical imaging lens  10  of the ninth embodiment are shown in  FIG. 40 . In the optical imaging lens  10  of the ninth embodiment, an overall effective focal length (EFL) is 4.082 millimeter (mm), a half field of view (HFOV) is 43.400°, an F-number (Fno) is 1.580, a system length is 5.322 mm and an image height is 4.500 mm. 
       FIG. 41  shows the aspheric coefficients of the object-side surface  15  of the first lens element  1  to the image-side surface  76  of the seventh lens element  7  in Equation (1) according to the ninth embodiment. 
     In addition, the relationship between the important parameters in the optical imaging lens  10  of the ninth embodiment is shown in  FIGS. 44 and 45 . 
     The longitudinal spherical aberration of the ninth embodiment is shown in  FIG. 39A , in which imaging point deviations of the off-axis rays at different heights are controlled within the range of ±0.07 mm. In the two diagrams of the field curvature aberrations as illustrated  FIG. 39B  and  FIG. 39C , the three representative wavelengths have the focal length variation within ±0.14 mm in the entire field of view. In  FIG. 39D , the diagram of distortion aberration shows that the distortion aberration in the ninth embodiment is maintained within the range of ±16%. 
     In view of the above description, it can be known that the system length TTL of the ninth embodiment is shorter than that of the first embodiment. 
     Referring to  FIG. 42 ,  FIG. 43 ,  FIG. 44  and  FIG. 45 ,  FIG. 42 ,  FIG. 43 ,  FIG. 44  and  FIG. 45  are table diagrams showing the optical parameters provided in the first embodiment to the ninth embodiment. 
     In order to effectively shorten the system length TTL of the optical imaging lens  10  and to enable the optical imaging lens  10  to have a large image height ImgH so the image sensor can receive more light and appropriately increase the optical imaging quality, the optical imaging lens  10  in the embodiments of the invention satisfies the following condition expression: (G67+T7)/(T1+T2)≥1.600, wherein a more preferable range is 1.600≤(G67+T7)/(T1+T2)≤6.100. 
     For achieving the shortened system length for the lens and ensuring the imaging quality, shortening the air gaps of the lens elements or properly shortening the thicknesses of the lens elements is also one of the measures taken in the invention. Moreover, when the difficulty in the manufacturing process is further taken into consideration, if the numerical limitations in the following condition expressions can be satisfied, a more preferable configuration may also be accomplished for the optical imaging lens  10  according to the embodiments of the invention. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: EFL/(AAG+BFL)≤2.000, wherein a more preferable range is 0.800≤EFL/(AAG+BFL)≤2.000. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: (T5+T6+T7)/(T1+G12)≥1.900, wherein a more preferable range is 1.900≤(T5+T6+T7)/(T1+G12)≤11.000. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: TL/AAG≥1.600, wherein a more preferable range is 1.600≤TL/AAG≤3.500. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: TTL/BFL≤7.650, wherein a more preferable range is 4.300≤TTL/BFL≤7.650. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: (G45+T7)/(T1+G12+T2)≥1.400, wherein a more preferable range is 1.400≤(G45+T7)/(T1+G12+T2)≤4.200. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: ALT/(G34+G45+G56)≤4.500, wherein a more preferable range is 1.000≤ALT/(G34+G45+G56)≤4.500. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: TL/(T2+G23+T3)≤7.000, wherein a more preferable range is 4.400≤TL/(T2+G23+T3)≤7.000. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: (T4+G45+T5+G56+T6)/(T2+G23+T3)≤2.600, wherein a more preferable range is 1.500≤(T4+G45+T5+G56+T6)/(T2+G23+T3)≤2.600. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: TTL/(T5+G56+T6)≤8.000, wherein a more preferable range is 2.900≤TTL/(T5+G56+T6)≤8.000. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: (T4+G45)/(T2+T5+G56)≥0.900, wherein a more preferable range is 0.900≤(T4+G45)/(T2+T5+G56)≤4.800. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: (EFL+BFL)/AAG≤4.200, wherein a more preferable range is 1.400≤(EFL+BFL)/AAG≤4.200. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: (T3+G34+T4)/(T1+G12+T2)≥1.600, wherein a more preferable range is 1.600≤(T3+G34+T4)/(T1+G12+T2)≤10.700. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: (T5+G56+T6)/(T3+G34+T4)≤1.000, wherein a more preferable range is 0.300≤(T5+G56+T6)/(T3+G34+T4)≤1.000. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: AAG/(T6+T7)≤2.200, wherein a more preferable range is 0.700≤AAG/(T6+T7)≤2.200. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: (T5+T7)/(G12+G67)≥1.200, wherein a more preferable range is 1.200≤(T5+T7)/(G12+G67)≤6.200. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: TTL/EFL≤2.700, wherein a more preferable range is 0.700≤TTL/EFL≤2.700. 
     The optical imaging lens  10  in the embodiments of the invention further satisfies the following condition expression: (EFL+AAG)/ALT≥1.800, wherein a more preferable range is 1.800≤(EFL+AAG)/ALT≤6.100. 
     In addition, lens limitations may be further added by using any combination relation of the parameters selected from the provided embodiments to implement the design for the lens with the same framework set forth in the embodiments of the invention. Due to the unpredictability in an optical system design, with the framework set forth in the invention, if aforementioned conditions are satisfied, the optical imaging lens in the embodiments of the invention can achieve a shortened depth, an enlarged available aperture, an improved imaging quality, a reduced area ratio of the optical imaging lens placed on the camera, or an improved assembly yield so the shortcomings in the conventional art can be solved. 
     The aforementioned limitation relational expressions are provided in an exemplary sense and can be selectively combined and applied to the embodiments of the invention in different manners; the invention should not be limited to the above examples. In implementation of the invention, apart from the above-described relations, it is also possible to add additional detailed structure such as more concave and convex curvatures arrangement of a specific lens element or a plurality of lens elements so as to enhance control of system property and/or resolution. It should be noted that the above-described details can be optionally combined and applied to the other embodiments of the invention under the condition where they are not in conflict with one another. 
     To sum up, the optical imaging lens  10  described in the embodiments of the invention may have at least one of the following advantages and/or achieve at least one of the following effects. 
     1. The longitudinal spherical aberrations, the astigmatic aberrations, and the distortion aberrations provided in the embodiments of the invention all comply with usage specifications. Moreover, the off-axis rays of the three representative wavelengths of red, green and blue at different heights are all focused near the imaging point, and the skew margin of the curve of each wavelength shows that the imaging point deviation of the off-axis rays at different heights is under control to provide the capability of suppressing spherical aberrations, image aberrations, and distortion. With further examination upon the imaging quality data, inter-distances between the three representative wavelengths of red, green and blue are fairly close, which represents that light rays with different wavelengths in the invention can be well focused under different circumstances to provide the capability of suppressing dispersion. In summary, the invention can achieve excellent image quality through design and mutual matching of the lenses. 
     2. In the optical imaging lens of the embodiments of the invention, by designing the periphery region of the image-side surface of the first lens element to be convex, designing the periphery region of the image-side surface of the third lens element to be concave, designing the fourth lens element to be positive refracting power, designing the optical axis region of the image-side surface of the fifth lens element to be concave and designing the optical axis region of the image-side surface of the sixth lens element to be concave, the entire optical imaging lens have good imaging quality while effectively increasing luminous flux. 
     3. In the optical imaging lens of the embodiments of the invention, by designing the periphery region of the image-side surface of the third lens element to be concave, designing the periphery region of the object-side surface of the fourth lens element to be concave, designing the optical axis region of the image-side surface of the fifth lens element to be concave, designing the optical axis region of the image-side surface of the sixth lens element to be concave, designing the optical axis region of the object-side surface of the seventh lens element to be convex, and then designing the fourth lens element to be positive refracting power or designing the fifth lens element to be negative refracting power, the optical imaging lens can achieve the purpose of correcting optical system aberrations and reducing distortion. 
     4. The design of the lens elements adopting the aspheric surface in each embodiment of the invention is more advantageous for optimizing image quality. 
     5. The plastic material selected and used by the lens elements in each embodiment of the invention contributes to light weight, and can reduce the weight and cost of the optical imaging lens. 
     All of the numerical ranges including the maximum and minimum values and the values therebetween which are obtained from the combining proportion relation of the optical parameters disclosed in each embodiment of the invention are implementable. 
     Although the present disclosure has been described with reference to the above embodiments, it will be apparent to one of ordinary skill in the art that modifications to the described embodiments may be made without departing from the spirit of the disclosure. Accordingly, the scope of the disclosure will be defined by the attached claims and not by the above detailed descriptions.