Abstract:
Disclosed is a photographic optical lens system. The disclosed photographic optical lens system includes a stop, a lens group including at least one aspherical lens, and an image sensor configured to record an image transmitted through the lens group, wherein the photographic optical lens system satisfies the following Expression: 
       0.15≦( D   L1-L2 )/ OAL ≦0.4  &lt;Expression&gt;
 
     where D L1-L2  in Expression denotes a distance from a center of a first surface of a lens closest to an object (hereinafter, referred to as a first lens) to a center of a second surface of a second lens arranged directly next to the first lens, and OAL denotes a distance (a total length of the lens group) from the center of the first surface of the first lens to a center of a second surface of a lens arranged farthest from the object.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of Korean Patent Application No. 10-2016-0033673, filed on Mar. 21, 2016, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. 
       BACKGROUND 
       [0002]    1. Field 
         [0003]    One or more aspects of the disclosed embodiment relate to an optical system including a plurality of lenses, and more particularly, to an optical lens system that can be mounted on an apparatus capable of capturing an image. 
         [0004]    2. Brief Description of Related Developments 
         [0005]    Recently, various composite apparatuses formed by combining a plurality of apparatuses are being introduced. A combination of a mobile phone and a camera may be a representative example of the composite apparatus. Since a mobile phone itself has various functions, a space in which a camera may be mounted on the mobile phone is not large. Therefore, a camera to be mounted on a mobile phone needs to be miniaturized and slimmed. In addition, the camera to be mounted on a mobile phone needs to be lightweight. Accordingly, although a compact lens is implemented by using plastic as a material of a camera lens, there are limits to be overcome in terms of performance. 
       SUMMARY 
       [0006]    One or more aspects of the disclosed embodiment include a photographic optical lens system which is small and lightweight and has a high-resolution and a wide angle viewing range. 
         [0007]    Additional aspects of the disclosed embodiment will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented aspects of the disclosed embodiment. 
         [0008]    According to one or more aspects of the disclosed embodiment, a photographic optical lens system includes a stop, a lens group including at least one aspherical lens, and an image sensor configured to record an image transmitted through the lens group, wherein the photographic optical lens system satisfies the following Expression: 
         [0000]      0.15≦( D   L1-L2 )/ OAL ≦0.4  &lt;Expression&gt;
 
         [0000]    where, in Expression, D L1-L2  denotes a distance from a center of a first surface of a lens (hereinafter, referred to as a first lens) closest to an object to a center of a second surface of a second lens arranged directly next to the first lens, and OAL denotes a distance (a total length of the lens group) from the center of the first surface of the first lens to a center of a second surface of a lens arranged farthest from the object. 
         [0009]    In the optical lens system, the lens group may include a total of six lenses sequentially arranged on the same optical axis, including the first and second lenses. 
         [0010]    The optical lens system may further include a specific wavelength blocking portion provided between the lens group and the image sensor. 
         [0011]    The stop may be arranged next to the second lens. For example, when a lens arranged next to the second lens is referred to as a third lens, the stop may be arranged between a second surface of the third lens and the second lens. 
         [0012]    A refractive power of an odd-numbered lens and a refractive power of an even-numbered lens among the plurality of lenses included in the lens group may be opposite to each other. 
         [0013]    An effective diameter of the first lens among the six sequentially arranged lenses may be greater than an effective diameter of the third lens and may be smaller than an effective diameter of a sixth lens. 
         [0014]    An effective diameter of the first lens among the six sequentially arranged lenses may be equal to an effective diameter of a third lens. 
         [0015]    An effective diameter of the first lens among the six sequentially arranged lenses may be equal to an effective diameter of a sixth lens. 
         [0016]    An effective diameter of the first lens among the six sequentially arranged lenses, an effective diameter of a third lens, and an effective diameter of a sixth lens may be the same. 
         [0017]    A refractive index of a third lens among the six sequentially arranged lenses may be smaller than a refractive index of a fourth lens. 
         [0018]    An Abbe&#39;s number of a third lens among the six sequentially arranged lenses may be greater than an Abbe&#39;s number of a fourth lens. 
         [0019]    The first lens, a third lens, and a sixth lens among the six sequentially arranged lenses may satisfy the following Expression: 
         [0000]        DL 3≦ DL 1≦ DL 6  &lt;Expression&gt;
 
         [0000]    where DL 1 , DL 3 , and DL 6  respectively denote effective diameters of the first lens, the third lens, and the sixth lens. 
         [0020]    A third lens and a fourth lens among the six sequentially arranged lenses may satisfy the following Expression: 
         [0000]      0.7≦Ind3/Ind4&lt;1.5  &lt;Expression&gt;
 
         [0000]    where Ind 3  denotes a refractive index of the third lens and Ind 4  denotes a refractive index of the fourth lens. 
         [0021]    The optical lens system may satisfy the following Expressions: 
         [0000]      85≦FOV≦150  &lt;Expression&gt;
 
         [0000]    where FOV denotes an effective viewing angle of the optical lens system. 
         [0000]      0.6≦TTL/IH≦0.9  &lt;Expression&gt;
 
         [0000]    where IH denotes a height of an effective image and TTL denotes a distance from a center of the first surface of the first lens to the image sensor. 
         [0022]    The third lens and the fourth lens may satisfy the following Expression: 
         [0000]      1.5≦Abv3/Abv4≦3.0  &lt;Expression&gt;
 
         [0000]    where Abv 3  denotes the Abbe&#39;s number of the third lens and Abv 4  denotes the Abbe&#39;s number of the fourth lens. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0023]    These and/or other aspects of the disclosed embodiment will become apparent and more readily appreciated from the following description of the aspects of the disclosed embodiment, taken in conjunction with the accompanying drawings in which: 
           [0024]      FIG. 1  is a cross-sectional view illustrating a photographic optical lens system (a first optical lens system) according to one aspect of the disclosed embodiment; 
           [0025]      FIGS. 2 to 4  are aberration diagrams illustrating longitudinal spherical aberrations, astigmatic field curvatures, and distortion of the first optical lens system; 
           [0026]      FIG. 5  is a cross-sectional view illustrating a photographic optical lens system (a second optical lens system) according to another aspect of the disclosed embodiment; 
           [0027]      FIGS. 6 to 8  are aberration diagrams illustrating longitudinal spherical aberrations, astigmatic field curvatures, and distortion of the second optical lens system; 
           [0028]      FIG. 9  is a cross-sectional view illustrating a photographic optical lens system (a third optical lens system) according to still another aspect of the disclosed embodiment; and 
           [0029]      FIGS. 10 to 12  are aberration diagrams illustrating longitudinal spherical aberrations, astigmatic field curvatures, and distortion of the third optical lens system. 
       
    
    
     DETAILED DESCRIPTION 
       [0030]    Reference will now be made in detail to aspects of the disclosed embodiment, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the present aspects of the disclosed embodiment may have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the aspects of the disclosed embodiment are merely described below, by referring to the figures, to explain aspects of the present description. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list. 
         [0031]    Hereinafter, photographic optical lens systems according to various aspects of the disclosed embodiment will be described in detail with reference to the accompanying drawings. Thicknesses of layers or regions illustrated in the drawings during the description are exaggerated for clarity of description. In the following description, the same reference numerals denote the same members. 
         [0032]    In the following description, a first surface of each lens represents an incident surface on which light is incident, and a second surface represents an emission surface through which light is emitted. 
         [0033]      FIG. 1  illustrates a photographic optical lens system (hereinafter, referred to as a first optical lens system) according to an example aspect. 
         [0034]    Referring to  FIG. 1 , a first optical lens system  10  includes a lens group. The lens group includes a plurality of lenses. The plurality of lenses may include at least one aspherical lens. Also, at least one of a light incident surface and light emission surface of one lens, which is selected from the plurality of lenses included in the first optical lens system  10 , may be an aspherical surface. The first optical lens system  10  may include first, second, third, fourth, fifth, and sixth lenses  20 ,  30 ,  40 ,  50 ,  60 , and  70  as an example of the lens group. The total number of lenses of the first optical lens system  10  may be more or less than six. The first optical lens system  10  may further include a stop S 1 , a specific wavelength blocking portion  80 , and an image sensor  90 , and may include a member other than these members as necessary. The first to sixth lenses  20  to  70  may be sequentially arranged between an object to be photographed and the image sensor  90 . Therefore, the object may be located in front of the first lens  20 . The first to sixth lenses  20  to  70  may be non-glass lenses and may be, for example, plastic lenses. The first to sixth lenses  20  to  70  are sequentially arranged from the object toward the image sensor  90 . 
         [0035]    Light incident on the first lens  20  sequentially passes through the second to sixth lenses  30  to  70  and reaches the image sensor  90 . The specific wavelength blocking portion  80  may be arranged between the sixth lens  70  and the image sensor  90 . The specific wavelength blocking portion  80  may be, for example, an infrared blocking filter or a similar member, but the presently disclosed embodiment is not limited thereto, and the specific wavelength blocking portion  80  may be a filter or member which blocks other wavelengths. 
         [0036]    The stop S 1  may be located between the second lens  30  and a second surface  40   b  of the third lens  40  within a range that does not deviate from the first optical lens system  10 . For example, the stop S 1  may be located between the second lens  30  and the third lens  40 . Some light incident on the third lens  40  may be limited by the stop S 1 . The stop S 1  may be located near a first surface  40   a  of the third lens  40  and may manually or automatically adjust an amount of light incident on the third lens  40 . Positions of the stop S 1  and the blocking portion  80  may be adjusted as necessary. The image sensor  90  and the blocking portion  80  may be arranged to be parallel to each other. All of the stop S 1 , the first to sixth lenses  20  to  70 , and the blocking portion  80  may be aligned on the same optical axis. The image sensor  90  may also be aligned on the optical axis. 
         [0037]    Next, optical characteristics of the first to sixth lenses  20  to  70  included in the lens group will be described. Some of the first to sixth lenses  20  to  70  may have different refractive powers from those of the other lenses. 
         [0038]    Specifically, the first lens  20  may be a lens having a positive refractive power. A first surface  20   a  of the first lens  20  may be, for example, an aspherical surface. A center portion of a second surface  20   b  of the first lens  20  may be convex toward the image sensor  90 . The second surface  20   b  may be, for example, an aspherical surface. 
         [0039]    The second lens  30  located next to the first lens  20  may be a lens having a negative refractive power. A first surface  30   a  of the second lens  30  may be a surface which is convex toward the first lens  20 . The first surface  30   a  of the second lens  30  may be, for example, an aspherical surface. A second surface  30   b  of the second lens  30  may also be a surface which is convex toward the first lens  20 . The second surface  30   b  may be a curved surface and may be, for example, an aspherical surface. 
         [0040]    The third lens  40  may be a lens having a positive refractive power. The first surface  40   a  of the third lens  40  may be a curved surface which is convex toward the second lens  30 . The first surface  40   a  of the third lens  40  may be, for example, an aspherical surface. The second surface  40   b  of the third lens  40  may be a curved surface which is convex toward the fourth lens  50  and may be, for example, an aspherical surface. 
         [0041]    The fourth lens  50  may be a lens having a negative refractive power. The fourth lens  50  has a shape which is convex toward the image sensor  90  as a whole. Therefore, first and second surfaces  50   a  and  50   b  of the fourth lens  50  may be curved surfaces which are convex toward the image sensor  90  and may be, for example, aspherical surfaces. 
         [0042]    The fifth lens  60  may be a lens having a positive refractive power. The fifth lens  60  may have a shape which is convex toward the image sensor  90  as a whole. A second surface  60   b  of the fifth lens  60  may be more convex toward the image sensor  90  than a first surface  60   a  of the fifth lens  60 . All of the first surface  60   a  and the second surface  60   b  of the fifth lens  60  may be curved surfaces and may be, for example, aspherical surfaces. A center portion of the fifth lens  60  may be thicker than edges of the fifth lens  60 . 
         [0043]    The sixth lens  70  may be a lens having a negative refractive power. At least one of first and second surfaces  70   a  and  70   b  of the sixth lens  70  may be an aspherical surface. At least one of both of the surfaces of the sixth lens  70  may have at least one inflection point. For example, the second surface  70   b  of the sixth lens  70  may be an aspherical surface having one or more inflection points. A center portion of the first surface  70   a  of the sixth lens  70  may be convex toward the object, and a portion between edges and a center portion of the sixth lens  70  may be convex toward the image sensor  90 . A center region including the optical axis of the second surface  70   b  of the sixth lens  70  may be concave with respect to the image sensor  90 . That is, the center region of the second surface  70   b  may be convex toward the object. The second surface  70   b  has regions which are convex toward the image sensor  90  from the center region to the edges. That is, regions of the second surface  70   b  between the center region and the edges may be convex toward the image sensor  90 . Thickest portions of the sixth lens  70  are located between the center region and the edges. A thickness of the center region (e.g., a thickness of a portion through which the optical axis passes) of the sixth lens  70  may be relatively thin. 
         [0044]    In the first optical lens system  10 , an effective diameter of the first lens  20  may be greater than that of the third lens  40 . In another example, the effective diameter of the first lens  20  may be greater than that of the third lens  40 . In still another example, the effective diameter of the first lens  20  may be smaller than or equal to that of the sixth lens  70 . 
         [0045]    The refractive powers of the above-described first to sixth lenses  20  to  70  may be distributed so that an aberration is minimized. For example, the refractive powers of the first to sixth lenses  20  to  70  may be distributed so that a chromatic aberration is minimized. For example, a lens having a relatively low refractive index may be used as the third lens  40  and a lens having a relatively high refractive index may be used as the fourth lens  50 . 
         [0046]    Also, the optical characteristics of the first to sixth lenses  20  to  70  may vary so that an aberration is minimized. For example, as a method of minimizing a chromatic aberration, a lens having a relatively high Abbe&#39;s number may be used as the third lens  40  and a lens having a relatively low Abbe&#39;s number may be used as the fourth lens  50 . 
         [0047]    When the first to sixth lenses  20  to  70  are arranged in this way, the first to sixth lenses  20  to  70  are arranged in consideration of some or all optical characteristics of the lenses, and thus an aberration of the first optical lens system  10  may be corrected. 
         [0048]    A portion of the blocking portion  80  provided next to the sixth lens  70  may come into contact with the second surface  70   b  of the sixth lens  70  or may be spaced apart from the second surface  70   b  of the sixth lens  70 . 
         [0049]    An overall focal length and performance of the first optical lens system  10  may vary according to a thickness, a focal length, a position, and the like of each of the first to sixth lenses  20  to  70  included in the first optical lens system  10 . 
         [0050]    The first optical lens system  10  may satisfy the following Expressions 1 to 7, and the members included in the first optical lens system  10  may have optical characteristics causing the first optical lens system  10  to satisfy the following Expressions 1 to 7. 
         [0000]      85≦FOV≦150  &lt;Expression 1&gt;
 
         [0051]    In Expression 1, FOV denotes an effective viewing angle, that is, a wide angle range, of the optical lens system. Considering the optical characteristics of the members included in the first optical lens system  10  to be described below, the first optical lens system  10  satisfies Expression 1. Therefore, the first optical lens system  10  may have a function of a wide-angle lens having a wide viewing angle. 
         [0000]      0.6≦TTL/IH≦0.9  &lt;Expression 2&gt;
 
         [0052]    In Expression 2, IH denotes a height of an effective image and TTL denotes a total length of the optical lens system, which is measured along the optical axis, that is, a distance from a vertex (or the center) of the first surface of the first lens to the image sensor. 
         [0053]    Expression 2 defines the overall length of the optical lens system with respect to a size of the image sensor. When the optical lens system satisfies Expression 2, a wide-angle and ultra-slim optical lens system may be manufactured. Therefore, when the first optical lens system  10  satisfies Expression 2, the first optical lens system  10  may be mounted on a small device, for example, a mobile communication device. 
         [0000]        DL 3≦ DL 1≦ DL 6  &lt;Expression 3&gt;
 
         [0054]    In Expression 3, DL 1 , DL 3 , and DL 6  respectively denote effective diameters of the first lens, the third lens, and the sixth lens included in the optical lens system. 
         [0055]    Expression 3 defines a size of an effective diameter of a lens. An optical lens system which satisfies Expression 3 may maintain high optical performance while implementing wide angle performance. 
         [0056]    For example, in order for the first optical lens system  10  to satisfy Expression 3, the effective diameter of the first lens  20  may be greater than the effective diameter of the third lens  40  and smaller than the effective diameter of the sixth lens  70 . In another aspect of the disclosed embodiment, the effective diameter of the first lens  20  may be equal to the effective diameter of the third lens  40 . In still another aspect of the disclosed embodiment, the effective diameter of the first lens  20  may be equal to the effective diameter of the sixth lens  70 . 
       &lt;Expression 4&gt; 
       [0057]    A condition in which the stop is located between the third lens and the fourth lens as a condition in which a position of the stop is defined. 
         [0058]    When the stop S 1  of the first optical lens system  10  satisfies Expression 4, the first optical lens system  10  may maintain high optical performance while maintaining a wide angle. 
         [0000]      0.15≦( D   L1-L2 )/ OAL ≦0.4  &lt;Expression 5&gt;
 
         [0059]    In Expression 5, D L1-L2  denotes a distance from the center of the first surface of the first lens of the optical lens system to the center of the second surface of the second lens. Also, OAL denotes a distance from the center of the first surface of the first lens to the center of the second surface of the sixth lens. Therefore, Expression 5 defines a range of thicknesses of the first through second lenses with respect to a length (a total length) of the lens group. The fact that the optical lens system satisfies Expression 5 means that the corresponding optical lens system may achieve high performance while securing an ultra-wide viewing angle. 
         [0000]      0.7≦Ind3/Ind4&lt;1.1  &lt;Expression 6&gt;
 
         [0060]    In Expression 6, Ind 3  denotes a refractive index of the third lens of the optical lens system and Ind 4  denotes a refractive index of the fourth lens. 
         [0061]    When the first optical lens system  10  satisfies Expression 6, the first optical lens system  10  may minimize an aberration, and may minimize, for example, a chromatic aberration. 
         [0000]      1.5≦Abv3/Abv4≦3.0  &lt;Expression 7&gt;
 
         [0062]    In Expression 7, Abv 3  denotes an Abbe&#39;s number of the third lens of the optical lens system and Abv 4  denotes an Abbe&#39;s number of the fourth lens. 
         [0063]    When the first optical lens system  10  satisfies Expression 7, the first optical lens system  10  may minimize an aberration, and may minimize, for example, a chromatic aberration. 
         [0064]    The following Table 1 illustrates variables related to Expressions 1 to 7, definitions of the variables, values of the variables, and values of Expressions 1 to 7 measured with those variable values in the first optical lens system  10 . 
         [0000]    
       
         
               
               
               
             
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                 Item 
                 Value 
                 Definition (Others) 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 IH 
                 6.87 
                 A height of an effective image 
               
               
                 Semi IH 
                 3.43 
                 Half of a height of an effective image 
               
               
                 TTL 
                 5.20 
                 A distance from the center of the 
               
               
                   
                   
                 top of a first lens to a sensor 
               
               
                 OAL 
                 4.05 
                 A distance from the center of a first 
               
               
                   
                   
                 surface of a first lens to the center of a 
               
               
                   
                   
                 second surface of a sixth lens 
               
               
                 FOV 
                 98.98 
                 An effective diameter of angle of view 
               
               
                   
                   
                 (a diagonal direction) 
               
               
                 θ 
                 49.49 
                 Half of an effective diameter of angle 
               
               
                   
                   
                 of view (a diagonal direction) 
               
               
                 E.F.L 
                 2.83 
                 A focal length of an optical lens system 
               
               
                 B.F.L 
                 1.15 
                 A distance from the center of a second 
               
               
                   
                   
                 surface of a sixth lens to a sensor 
               
               
                 Fno 
                 1.89 
                 E.F.L/EPD 
               
               
                 tan(θd/2) 
                 0.461 
                 A tangent value of half of a θ value 
               
               
                 DL1 
                 3.893 
                 An effective diameter of a first lens 
               
               
                   
                   
                 (an aspherical surface) 
               
               
                 DL3 
                 1.660 
                 An effective diameter of a third lens 
               
               
                   
                   
                 (an aspherical surface) 
               
               
                 DL6 
                 5.710 
                 An effective diameter of a sixth lens 
               
               
                   
                   
                 (an aspherical surface) 
               
               
                 D L1-L2   
                 0.852 
                 A distance from the center of a first 
               
               
                   
                   
                 surface to the center of a second 
               
               
                   
                   
                 surface of a second lens 
               
               
                 Ind3 
                 1.544 
                 A refractive index of a third lens 
               
               
                 Ind4 
                 1.650 
                 A refractive index of a fourth lens 
               
               
                 Abv3 
                 56.093 
                 An Abbe&#39;s number of a third lens 
               
               
                 Abv4 
                 21.474 
                 An Abbe&#39;s number of a fourth lens 
               
               
                 Expression 1 
                 98.98 
               
               
                 Expression 2 
                 0.76 
               
               
                 Expression 3 
                 Satisfied 
               
               
                 Expression 4 
                 Satisfied 
               
               
                 Expression 5 
                 0.21 
               
               
                 Expression 6 
                 0.94 
               
               
                 Expression 7 
                 2.61 
               
               
                   
               
             
          
         
       
     
         [0065]    Referring to Table 1, it may be seen that the first optical lens system  10  satisfies Expression 1 to 7. 
         [0066]    The following Table 2 illustrates an implementation example of optical characteristics for each of the members (the lenses, the stop, the blocking portion, and the image sensor) included in the first optical lens system  10 , and illustrates radiuses of curvature (R), lens thicknesses or distances (T) between lenses or adjacent components, refractive indexes (Nd), and Abbe&#39;s numbers (Vd). The refractive index (Nd) denotes a refractive index of a lens measured using a d-line. The Abbe&#39;s number (Vd) denotes an Abbe&#39;s number of a lens with respect to a d-line. A mark * after a surface number indicates that the corresponding surface is an aspherical surface. Units of values of R and T are mm. 
         [0000]    
       
         
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                 Component 
                 Surface 
                 R 
                 T 
                 Nd 
                 Vd 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 First lens 20 
                 20a* 
                 −5.52860 
                 0.50997 
                 1.53175 
                 55.85588 
               
               
                   
                 20b* 
                 −2.42434 
                 0.06712 
                 — 
                 — 
               
               
                 Second lens 30 
                 30a* 
                 1.68981 
                 0.27441 
                 1.63916 
                 23.51650 
               
               
                   
                 30b* 
                 1.19762 
                 0.40201 
                 — 
                 — 
               
               
                 Stop S1 
                 — 
                 Infinity 
                 0.09026 
                 — 
                 — 
               
               
                 Third lens 40 
                 40a* 
                 4.22113 
                 0.48002 
                 1.54410 
                 56.09278 
               
               
                   
                 40b* 
                 −2.44692 
                 0.42651 
                 — 
                 — 
               
               
                 Fourth lens 50 
                 50a* 
                 −3.79995 
                 0.20000 
                 1.65041 
                 21.47439 
               
               
                   
                 50b* 
                 −24.52324 
                 0.24777 
                 — 
                 — 
               
               
                 Fifth lens 60 
                 60a* 
                 −2.31608 
                 0.75051 
                 1.54410 
                 56.09278 
               
               
                   
                 60b* 
                 −0.85074 
                 0.03000 
                 — 
                 — 
               
               
                 Sixth lens 70 
                 70a* 
                 2.21906 
                 0.56895 
                 1.53175 
                 55.85588 
               
               
                   
                 70b* 
                 0.76645 
                 0.56066 
                 — 
                 — 
               
               
                 Blocking 
                 Front 
                 Infinity 
                 0.21000 
                 1.51680 
                 64.19733 
               
               
                 portion 80 
                 surface 
               
               
                   
                 Back 
                 Infinity 
                 0.38680 
                 — 
                 — 
               
               
                   
                 surface 
               
               
                 Image sensor 90 
                 — 
                 Infinity 
                 −0.00500 
                 — 
                 — 
               
               
                   
               
             
          
         
       
     
         [0067]    The aspherical surfaces of the first to sixth lenses  20  to  70  included in the first optical lens system  10  satisfy the following aspherical surface equation, Expression 8. 
         [0000]    
       
         
           
             
               
                 
                   Z 
                   = 
                   
                     
                       
                         Y 
                         2 
                       
                       
                         R 
                         ( 
                         
                           1 
                           + 
                           
                             
                               1 
                               - 
                               
                                 
                                   ( 
                                   
                                     1 
                                     + 
                                     K 
                                   
                                   ) 
                                 
                                  
                                 
                                   
                                     Y 
                                     2 
                                   
                                   / 
                                   
                                     R 
                                     2 
                                   
                                 
                               
                             
                           
                         
                       
                     
                     + 
                     
                       AY 
                       4 
                     
                     + 
                     
                       BY 
                       6 
                     
                     + 
                     
                       CY 
                       8 
                     
                     + 
                     
                       DY 
                       10 
                     
                     + 
                     
                       EY 
                       12 
                     
                     + 
                     
                       FY 
                       14 
                     
                     + 
                     
                       GY 
                       16 
                     
                     + 
                     
                       HY 
                       18 
                     
                     + 
                     
                       JY 
                       20 
                     
                   
                 
               
               
                 
                   &lt; 
                   
                     Expression 
                      
                     
                         
                     
                      
                     8 
                   
                   &gt; 
                 
               
             
           
         
       
     
         [0068]    In Expression 8, Z denotes a distance measured in an optical axis direction from a vertex of each lens to, Y denotes a distance in a direction perpendicular to the optical axis, R denotes a radius of curvature, K denotes a conic constant, and A, B, C, D, E, F, G, H, and J denote aspherical coefficients. 
         [0069]    The following Table 3 illustrates aspherical coefficients of the lenses included in the first optical lens system  10 . 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 3 
               
               
                   
               
             
             
               
                 Surface 
                 K 
                 A 
                 B 
                 C 
                 D 
                 E 
               
               
                   
               
               
                 20a* 
                 −99.77563 
                 0.08774 
                 −0.05628 
                 0.03630 
                 −0.01931 
                 0.00856 
               
               
                 20b* 
                 −98.60463 
                 0.08963 
                 −0.11761 
                 0.12705 
                 −0.09576 
                 0.04826 
               
               
                 30a* 
                 −0.22262 
                 0.33339 
                 −2.65886 
                 10.01128 
                 −27.56063 
                 52.38082 
               
               
                 30b* 
                 0.82648 
                 −0.41622 
                 1.10972 
                 −9.09869 
                 44.41684 
                 −143.03416 
               
               
                 40a* 
                 0.40588 
                 0.00168 
                 −0.06148 
                 −0.33661 
                 4.06664 
                 −18.96472 
               
               
                 40b* 
                 1.64341 
                 −0.14453 
                 0.91069 
                 −6.86821 
                 31.37089 
                 −91.50398 
               
               
                 50a* 
                 6.99638 
                 −0.25815 
                 0.21256 
                 −2.11620 
                 9.60165 
                 −22.26753 
               
               
                 50b* 
                 208.99956 
                 −0.10015 
                 −0.17798 
                 0.28979 
                 0.09896 
                 −0.55510 
               
               
                 60a* 
                 1.73828 
                 0.17094 
                 −0.11903 
                 −0.18967 
                 0.53017 
                 −0.57535 
               
               
                 60b* 
                 −0.86927 
                 0.31370 
                 −0.46747 
                 0.70097 
                 −0.79238 
                 0.58338 
               
               
                 70a 
                 −19.32692 
                 −0.06474 
                 −0.03170 
                 0.04197 
                 −0.01926 
                 0.00505 
               
               
                 70b 
                 −4.43809 
                 −0.07544 
                 0.03513 
                 −0.01422 
                 0.00440 
                 −0.00099 
               
               
                   
               
             
          
           
               
                 Surface 
                 F 
                 G 
                 H 
                 J 
               
               
                   
               
               
                 20a* 
                 −0.00294 
                 0.00069 
                 −0.00010 
                 0.00001 
               
               
                 20b* 
                 −0.01613 
                 0.00346 
                 −0.00044 
                 0.00002 
               
               
                 30a* 
                 −66.12386 
                 52.77386 
                 −24.04731 
                 4.76027 
               
               
                 30b* 
                 300.42903 
                 −396.28398 
                 297.30021 
                 −96.98726 
               
               
                 40a* 
                 47.80209 
                 −67.89631 
                 51.31210 
                 −15.97398 
               
               
                 40b* 
                 170.65581 
                 −196.43829 
                 126.95012 
                 −35.11260 
               
               
                 50a* 
                 31.21341 
                 −26.30813 
                 12.20539 
                 −2.39211 
               
               
                 50b* 
                 0.66062 
                 −0.41088 
                 0.13377 
                 −0.01796 
               
               
                 60a* 
                 0.41021 
                 −0.21265 
                 0.07012 
                 −0.01024 
               
               
                 60b* 
                 −0.23918 
                 0.04277 
                 0.00055 
                 −0.00081 
               
               
                 70a* 
                 −0.00080 
                 0.00007 
                 0.00000 
                 0.00000 
               
               
                 70b* 
                 0.00015 
                 −0.00001 
                 0.00000 
                 0.00000 
               
               
                   
               
             
          
         
       
     
         [0070]      FIG. 2  illustrates longitudinal spherical aberrations of the first optical lens system  10  when the lenses included in the first optical lens system  10  have dimensions and aspherical coefficients according to the above implementation example. In  FIG. 2 , a first graph G 1  illustrates a result when a wavelength of incident light is 435.8343 nm and a second graph G 2  illustrates a result when a wavelength of incident light is 486.1327 nm. A third graph G 3  illustrates a result when a wavelength of incident light is 546.0740 nm, and a fourth graph G 4  illustrates a result when a wavelength of incident light is 587.5618 nm. A fifth graph G 5  illustrates a result when a wavelength of incident light is 656.2725 nm. 
         [0071]      FIG. 3  illustrates astigmatic field curvatures of the first optical lens system  10  when the lenses included in the first optical lens system  10  have dimensions and aspherical coefficients according to the above implementation example.  FIG. 3  illustrates results measured by using light having a wavelength of 546.0740 nm. 
         [0072]    In  FIG. 3 , a first graph G 31  illustrates a tangential field curvature and a second graph G 32  illustrates a sagittal field curvature. 
         [0073]      FIG. 4  illustrates distortion of the first optical lens system  10  when the lenses included in the first optical lens system  10  have dimensions and aspherical coefficients according to the above implementation example. A result of  FIG. 4  is obtained by using light having a wavelength of 546.0740 nm. 
         [0074]    Next, a photographic optical lens system according to another aspect of the disclosed embodiment will be described. 
         [0075]      FIG. 5  illustrates a photographic optical lens system (hereinafter, referred to as a second optical lens system) according to another aspect of the disclosed embodiment. 
         [0076]    Referring to  FIG. 5 , a second optical lens system  100  includes a plurality of lenses. The plurality of lenses may form one lens group. The plurality of lenses may include at least one aspherical lens. Also, at least one of a light incident surface and light emission surface of one lens, which is selected from the plurality of lenses included in the second optical lens system  100 , may be an aspherical surface. The second optical lens system  100  may include first, second, third, fourth, fifth, and sixth lenses  120 ,  130 ,  140 ,  150 ,  160 , and  170 . The total number of lenses of the second optical lens system  100  may be more or less than six. The second optical lens system  100  may further include a stop S 2 , a specific wavelength blocking portion  180 , an image sensor  190 , and the like in addition to the first to sixth lenses  120  to  170 . The first to sixth lenses  120  to  170  may be sequentially arranged between an object to be photographed by the second optical lens system  100  and the image sensor  190 . Therefore, the object may be located in front of the first lens  120 . The first to sixth lenses  120  to  170  may be non-glass lenses and may be, for example, plastic lenses. The first to sixth lenses  120  to  170  are sequentially arranged from the object toward the image sensor  190 . 
         [0077]    Light incident on the first lens  120  sequentially passes through the second to sixth lenses  130  to  170  and reaches the image sensor  190 . The blocking portion  180  is provided between the sixth lens  170  and the image sensor  190 . The blocking portion  180  may be, for example, an infrared blocking filter or a similar member, but the presently disclosed embodiment is not limited thereto, and the blocking portion  180  may be a filter or member which blocks other wavelengths. 
         [0078]    The stop S 2  may be located between the second lens  130  and a second surface  140   b  of the third lens  140 . For example, the stop S 2  may be located between the second lens  130  and the third lens  140 . The stop S 2  may be located near a first surface  140   a  of the third lens  140  and may manually or automatically adjust an amount of light incident on the third lens  140 . Positions of the stop S 2  and the blocking portion  180  may be adjusted as necessary. The image sensor  190  and the blocking portion  180  may be parallel to each other. All of the stop S 2 , the first to sixth lenses  120  to  170 , and the blocking portion  180  may be aligned on the same optical axis. The image sensor  190  may also be aligned on the optical axis. 
         [0079]    Next, optical characteristics of the first to sixth lenses  120  to  170  will be described. Some of the first to sixth lenses  120  to  170  may have different refractive powers from those of the other lenses. 
         [0080]    Specifically, the first lens  120  may have a positive refractive power and may be an aspherical lens. A first surface  120   a  of the first lens  120  may be, for example, an aspherical surface. A second surface  120   b  of the first lens  120  may also be a curved surface having a predetermined curvature and may be, for example, an aspherical surface. 
         [0081]    The second lens  130  located next to the first lens  120  may have a negative refractive power. A first surface  130   a  of the second lens  130  may be a surface which is convex toward the first lens  120 . The first surface  130   a  of the second lens  130  may be, for example, an aspherical surface. The second surface  130   b  of the second lens  130  may also be a curved surface which is convex toward the first lens  120  and may be, for example, an aspherical surface. 
         [0082]    The third lens  140  may be a lens having a positive refractive power. The first surface  140   a  of the third lens  140  may be a curved surface which is convex toward the second lens  130  and may be, for example, an aspherical surface. The second surface  140   b  of the third lens  140  may be a curved surface which is convex toward the fourth lens  150  and may be, for example, an aspherical surface. Degrees of asphericality of the first and second surfaces  140   a  and  140   b  of the third lens  140  may be different from each other. 
         [0083]    The fourth lens  150  may be a lens having a negative refractive power. First and second surfaces  150   a  and  150   b  of the fourth lens  150  may be aspherical surfaces. The fourth lens  150  has a convex shape toward the image sensor  190  as a whole. 
         [0084]    The fifth lens  160  may be a lens having a positive refractive power. The fifth lens  160  may have a shape which is convex toward the image sensor  190  as a whole. A second surface  160   b  of the fifth lens  160  may be more convex toward the image sensor  190  than a first surface  160   a  of the fifth lens  160 . All of the first surface  160   a  and the second surface  160   b  of the fifth lens  160  may be curved surfaces and may be, for example, aspherical surfaces. A center portion of the fifth lens  160  may be thicker than edges of the fifth lens  160 . Degrees of asphericality of the first and second surfaces  160   a  and  160   b  of the fifth lens  160  may be different from each other. 
         [0085]    The sixth lens  170  may be a lens having a negative refractive power. At least one of first and second surfaces  170   a  and  170   b  of the sixth lens  170  may be an aspherical surface. At least one of both of the surfaces of the sixth lens  170  may have at least one inflection point. For example, the second surface  170   b  of the sixth lens  170  may be an aspherical surface having one or more inflection points. A center portion of the first surface  170   a  of the sixth lens  170  may be convex toward the object, and portions between edges and the center portion of the sixth lens  170  may be convex toward the image sensor  190 . A center region including the optical axis of the second surface  170   b  of the sixth lens  170  may be concave with respect to the image sensor  190 . That is, the center region of the second surface  170   b  may be convex toward the object. The second surface  170   b  has regions which are convex toward the image sensor  190  from the center region to the edges. That is, regions of the second surface  170   b  between the center region and the edges may be convex toward the image sensor  190 . Thickest portions of the sixth lens  170  are located between the center region and the edges. A thickness of the center region (e.g., a thickness of a portion through which the optical axis passes) of the sixth lens  170  may be relatively thin. 
         [0086]    In the second optical lens system  100 , an effective diameter of the first lens  120  may be greater than that of the third lens  140 . In another example, the effective diameter of the first lens  120  may be greater than that of the third lens  140 . In still another example, the effective diameter of the first lens  120  may be smaller than or equal to that of the sixth lens  170 . 
         [0087]    The refractive powers of the first to sixth lenses  120  to  170  of the second optical lens system  100  may be dispersed so that an aberration of the second optical lens system  100  is minimized. For example, the first to sixth lenses  120  to  170  may have a refractive power dispersion in which a chromatic aberration of the second optical lens system  100  is minimized. For example, a lens having a relatively low refractive index may be used as the third lens  140 , and a lens having a relatively high refractive index may be used as the fourth lens  150 . 
         [0088]    Also, the optical characteristics of the first to sixth lenses  120  to  170  may vary so that an aberration is minimized. For example, as a method of minimizing a chromatic aberration, a lens having a relatively high Abbe&#39;s number may be used as the third lens  140  and a lens having a relatively low Abbe&#39;s number may be used as the fourth lens  150 . 
         [0089]    The first to sixth lenses  120  to  170  are arranged in this way, and thus an aberration of the second optical lens system  100  may be corrected. 
         [0090]    A portion of the blocking portion  180  provided next to the sixth lens  170  may come into contact with the second surface  170   b  of the sixth lens  170  or may be spaced apart from the second surface  170   b  of the sixth lens  170 . 
         [0091]    An overall focal length and performance of the second optical lens system  100  may vary according to a thickness, a focal length, a position, and the like of each of the first to sixth lenses  120  to  170  included in the second optical lens system  100 . 
         [0092]    The following Table 4 illustrates variables related to the above-described Expressions 1 to 7, values of the variables, and values of Expressions 1 to 7 measured with these variable values in the first optical lens system  10 . 
         [0000]    
       
         
               
               
               
             
               
               
               
             
           
               
                   
                 TABLE 4 
               
               
                   
                   
               
               
                   
                 Item 
                 Value 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 IH 
                 6.87 
               
               
                   
                 Semi IH 
                 3.43 
               
               
                   
                 TTL 
                 5.20 
               
               
                   
                 OAL 
                 3.99 
               
               
                   
                 FOV 
                 99.12 
               
               
                   
                 θ 
                 49.56 
               
               
                   
                 E.F.L 
                 2.82 
               
               
                   
                 B.F.L 
                 1.21 
               
               
                   
                 Fno 
                 1.89 
               
               
                   
                 tan(θd/2) 
                 0.462 
               
               
                   
                 DL1 
                 3.843 
               
               
                   
                 DL3 
                 1.640 
               
               
                   
                 DL6 
                 5.583 
               
               
                   
                 D L1-L2   
                 0.838 
               
               
                   
                 Ind3 
                 1.544 
               
               
                   
                 Ind4 
                 1.650 
               
               
                   
                 Abv3 
                 56.093 
               
               
                   
                 Abv4 
                 21.474 
               
               
                   
                 Expression 1 
                 99.12 
               
               
                   
                 Expression 2 
                 0.76 
               
               
                   
                 Expression 3 
                 Satisfied 
               
               
                   
                 Expression 4 
                 Satisfied 
               
               
                   
                 Expression 5 
                 0.21 
               
               
                   
                 Expression 6 
                 0.94 
               
               
                   
                 Expression 7 
                 2.61 
               
               
                   
                   
               
             
          
         
       
     
         [0093]    The values of Expressions 1 to 7 in Table 4 are in a range of Expressions 1 to 7. From these results, it may be seen that the second optical lens system  100  satisfies Expressions 1 to 7. 
         [0094]    The following Table 5 illustrates an implementation example of optical characteristics for each of the members (the lenses, the stop, the blocking portion, and the image sensor) included in the second optical lens system  100 , and illustrates radiuses of curvature (R), lens thicknesses or distances (T) between lenses or adjacent components, refractive indexes (Nd), and Abbe&#39;s numbers (Vd). The refractive index (Nd) denotes a refractive index of a lens measured using a d-line. The Abbe&#39;s number (Vd) denotes an Abbe&#39;s number of a lens with respect to a d-line. A mark * after a surface number indicates that the corresponding surface is an aspherical surface. Units of values of R and T are mm. 
         [0000]    
       
         
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 5 
               
               
                   
               
               
                 Component 
                 Surface 
                 R 
                 T 
                 Nd 
                 Vd 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 First lens 120 
                 120a* 
                 −5.44904 
                 0.50563 
                 1.53175 
                 55.85588 
               
               
                   
                 120b* 
                 −2.40268 
                 0.06216 
                 — 
                 — 
               
               
                 Second lens 130 
                 130a* 
                 1.69043 
                 0.27051 
                 1.63916 
                 23.51650 
               
               
                   
                 130b* 
                 1.19932 
                 0.39624 
                 — 
                 — 
               
               
                 Stop S2 
                   
                 Infinity 
                 0.09090 
                 — 
                 — 
               
               
                 Third lens 140 
                 140a* 
                 4.45305 
                 0.47367 
                 1.54410 
                 56.09278 
               
               
                   
                 140b* 
                 −2.37343 
                 0.41628 
                 — 
                 — 
               
               
                 Fourth lens 150 
                 150a* 
                 −3.56713 
                 0.20000 
                 1.65041 
                 21.47439 
               
               
                   
                 150b* 
                 −25.55904 
                 0.25889 
                 — 
                 — 
               
               
                 Fifth lens 160 
                 160a* 
                 −2.29470 
                 0.75886 
                 1.54410 
                 56.09278 
               
               
                   
                 160b* 
                 −0.83514 
                 0.03000 
                 — 
                 — 
               
               
                 Sixth lens 170 
                 170a* 
                 1.92788 
                 0.52656 
                 1.53175 
                 55.85588 
               
               
                   
                 170b* 
                 0.72734 
                 0.56066 
                 — 
                 — 
               
               
                 Blocking 
                 Front 
                 Infinity 
                 0.21000 
                 1.51680 
                 64.19733 
               
               
                 portion 180 
                 surface 
               
               
                   
                 Back 
                 Infinity 
                 0.43894 
                 — 
                 — 
               
               
                   
                 surface 
               
               
                 Image sensor 190 
                   
                 Infinity 
                 0.00069 
               
               
                   
               
             
          
         
       
     
         [0095]    The aspherical surface of each of the first to sixth lenses  120  to  170  included in the second optical lens system  100  also satisfy Expression 8. 
         [0096]    The following Table 6 illustrates aspherical coefficients of the lenses included in the second optical lens system  100 . 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 6 
               
               
                   
               
             
             
               
                 Surface 
                 K 
                 A 
                 B 
                 C 
                 D 
                 E 
               
               
                   
               
               
                 120a* 
                 −106.27524 
                 0.08632 
                 −0.04788 
                 0.02348 
                 −0.00730 
                 0.00139 
               
               
                 120b* 
                 −102.67840 
                 0.09552 
                 −0.12788 
                 0.14318 
                 −0.11263 
                 0.05919 
               
               
                 130a* 
                 −0.24386 
                 0.36427 
                 −2.94190 
                 11.42789 
                 −32.13067 
                 61.99330 
               
               
                 130b* 
                 0.82909 
                 −0.41380 
                 1.01855 
                 −8.27195 
                 40.19410 
                 −129.57881 
               
               
                 140a* 
                 1.01221 
                 −0.00039 
                 −0.00355 
                 −0.79117 
                 6.20825 
                 −25.21447 
               
               
                 140b* 
                 1.60343 
                 −0.14009 
                 0.94956 
                 −7.49554 
                 35.66161 
                 −107.99058 
               
               
                 150a* 
                 6.74108 
                 −0.26434 
                 0.26153 
                 −2.25130 
                 10.21451 
                 −24.43358 
               
               
                 150b* 
                 356.96640 
                 −0.11588 
                 −0.13558 
                 0.26860 
                 0.05848 
                 −0.53780 
               
               
                 160a* 
                 1.73356 
                 0.16873 
                 −0.16790 
                 −0.01954 
                 0.20147 
                 −0.18831 
               
               
                 160b* 
                 −0.86994 
                 0.32456 
                 −0.47399 
                 0.65419 
                 −0.67735 
                 0.44816 
               
               
                 170a 
                 −16.38430 
                 −0.05763 
                 −0.04030 
                 0.04547 
                 −0.01986 
                 0.00498 
               
               
                 170b 
                 −4.32224 
                 −0.08060 
                 0.03767 
                 −0.01599 
                 0.00521 
                 −0.00122 
               
               
                   
               
             
          
           
               
                 Surface 
                 F 
                 G 
                 H 
                 J 
               
               
                   
               
               
                 120a* 
                 −0.00022 
                 0.00006 
                 −0.00001 
                 0.00000 
               
               
                 120b* 
                 −0.02057 
                 0.00456 
                 −0.00059 
                 0.00003 
               
               
                 130a* 
                 −79.19102 
                 63.81958 
                 −29.31929 
                 5.84503 
               
               
                 130b* 
                 273.52660 
                 −363.65088 
                 275.43980 
                 −90.77175 
               
               
                 140a* 
                 59.17009 
                 −80.39069 
                 58.82370 
                 −17.84899 
               
               
                 140b* 
                 208.59512 
                 −248.36244 
                 165.90213 
                 −47.44261 
               
               
                 150a* 
                 35.42803 
                 −30.83975 
                 14.76694 
                 −2.98842 
               
               
                 150b* 
                 0.73469 
                 −0.51074 
                 0.18402 
                 −0.02727 
               
               
                 160a* 
                 0.11039 
                 −0.05888 
                 0.02321 
                 −0.00396 
               
               
                 160b* 
                 −0.15377 
                 0.01454 
                 0.00493 
                 −0.00103 
               
               
                 170a* 
                 −0.00074 
                 0.00006 
                 0.00000 
                 0.00000 
               
               
                 170b* 
                 0.00019 
                 −0.00002 
                 0.00000 
                 0.00000 
               
               
                   
               
             
          
         
       
     
         [0097]      FIGS. 6 to 8  illustrate longitudinal spherical aberrations, astigmatic field curvatures, and distortion of the second optical lens system  100  when the lenses included in the second optical lens system  100  have dimensions and aspherical coefficients according to the above implementation example. Light used for obtaining the results of  FIGS. 6 to 8  may be the same as the light used for obtaining the results of  FIGS. 2 to 4 . 
         [0098]    First to fifth graphs G 61  to G 65  of  FIG. 6  respectively correspond to the first to fifth graphs G 1  to G 5  of  FIG. 2 . Also, first and second graphs G 71  and G 72  of  FIG. 7  respectively correspond to the first and second graphs G 31  and G 32  of  FIG. 3 . 
         [0099]    Next, a photographic optical lens system according to still another aspect of the disclosed embodiment will be described. 
         [0100]      FIG. 9  illustrates the photographic optical lens system (hereinafter, referred to as a third optical lens system) according to still another aspect of the disclosed embodiment. 
         [0101]    Referring to  FIG. 9 , a third optical lens system  200  may include a lens group similar to the first and second optical lens systems  10  and  100 . A plurality of lenses included in the lens group may include at least one aspherical lens. Also, at least one of a light incident surface and light emission surface of one lens, which is selected from the plurality of lenses included in the third optical lens system  200 , may be an aspherical surface. The third optical lens system  200  may include six lenses  220  to  270 . The total number of lenses of the third optical lens system  200  may be more or less than six. The third optical lens system  200  may further include a stop S 3 , a specific wavelength blocking portion  280 , an image sensor  290 , and the like in addition to the six lenses  220  to  270 . The first, second, third, fourth, fifth, and sixth lenses  220  to  270  may be sequentially arranged between an object to be photographed by the third optical lens system  200  and the image sensor  290 . Therefore, the object may be located in front of the first lens  220 . The first to sixth lenses  220  to  270  may be non-glass lenses and may be, for example, plastic lenses. The first to sixth lenses  220  to  270  are sequentially arranged from the object toward the image sensor  290 . 
         [0102]    Light incident on the first lens  220  sequentially passes through the second to sixth lenses  230  to  270  and reaches the image sensor  290 . The blocking portion  280  is provided between the sixth lens  270  and the image sensor  290 . The blocking portion  280  may be, for example, an infrared blocking filter or a similar member, but the presently disclosed embodiment is not limited thereto, and the blocking portion  280  may be a filter or member which blocks other wavelengths. The stop S 3  may be located between the second lens  230  and a second surface  240   b  of the third lens  240 . For example, the stop S 3  may be located between the second lens  230  and the third lens  240 . The stop S 3  may be located near a first surface  240   a  of the third lens  240  and may manually or automatically adjust an amount of light incident on the third lens  240 . Positions of the stop S 3  and the blocking portion  280  may be adjusted as necessary. The image sensor  290  and the blocking portion  280  may be parallel to each other. All of the stop S 3 , the first to sixth lenses  220  to  270 , and the blocking portion  280  may be aligned on the same optical axis. The image sensor  290  may also be aligned on the optical axis. 
         [0103]    Next, optical characteristics of the first to sixth lenses  220  to  270  will be described. Some of the first to sixth lenses  220  to  270  may have different refractive powers from those of the other lenses. 
         [0104]    Specifically, the first lens  220  may be a lens having a positive refractive power. The first lens  220  may be an aspherical lens. A first surface  220   a  of the first lens  220  may be an aspherical surface. A second surface  220   b  of the first lens  220  may be a curved surface having a predetermined curvature and may be, for example, an aspherical surface. 
         [0105]    The second lens  230  may be a lens having a negative refractive power. A first surface  230   a  of the second lens  230  may be a surface which is convex toward the first lens  220 . The first surface  230   a  of the second lens  230  may be, for example, an aspherical surface. A second surface  230   b  of the second lens  230  may also be a curved surface which is convex toward the first lens  220  and may be, for example, an aspherical surface. 
         [0106]    The third lens  240  may be a lens having a positive refractive power. The first surface  240   a  of the third lens  240  may be a curved surface which is convex toward the second lens  230  and may be, for example, an aspherical surface. The second surface  240   b  of the third lens  240  may be a curved surface which is convex toward the image sensor  290  and may be, for example, an aspherical surface. Degrees of asphericality of the first and second surfaces  240   a  and  240   b  of the third lens  240  may be different from each other. 
         [0107]    The fourth lens  250  may be a lens having a negative refractive power. First and second surfaces  250   a  and  250   b  of the fourth lens  250  may be aspherical surfaces. The fourth lens  250  may have a convex shape toward the image sensor  290  as a whole. 
         [0108]    The fifth lens  260  may be a lens having a positive refractive power. The fifth lens  260  may have a shape which is convex toward the image sensor  290  as a whole. A second surface  260   b  of the fifth lens  260  may be more convex toward the image sensor  290  than a first surface  260   a  of the fifth lens  260 . All of the first surface  260   a  and the second surface  260   b  of the fifth lens  260  may be curved surfaces and may be, for example, aspherical surfaces. A center portion of the fifth lens  260  may be thicker than edges of the fifth lens  260 . Degrees of asphericality of the first and second surfaces  260   a  and  260   b  of the fifth lens  260  may be different from each other. 
         [0109]    The sixth lens  270  may be a lens having a negative refractive power. At least one of first and second surfaces  270   a  and  270   b  of the sixth lens  270  may be an aspherical surface. At least one of both of the surfaces of the sixth lens  270  may have at least one inflection point. For example, the second surface  270   b  of the sixth lens  270  may be an aspherical surface having one or more inflection points. A center portion of the first surface  270   a  of the sixth lens  270  may be convex toward the object. However, portions between the center portion and edges of the first surface  270   a  may be convex toward the image sensor  290 . A center region including the optical axis of the second surface  270   b  of the sixth lens  270  may be concave with respect to the image sensor  290 . That is, the center region of the second surface  270   b  may be convex toward the object. The second surface  270   b  has regions which are convex toward the image sensor  290  from the center region to the edges. That is, regions of the second surface  270   b  between the center region and the edges may be convex toward the image sensor  290 . Thickest portions of the sixth lens  270  are located between the center region and the edges. A thickness of the center region (e.g., a thickness of a portion through which the optical axis passes) of the sixth lens  270  may be relatively thin. 
         [0110]    In the third optical lens system  200 , an effective diameter of the first lens  220  may be greater than that of the third lens  240 . For example, the effective diameter of the first lens  220  may be equal to or greater than that of the third lens  240 . In another example, the effective diameter of the first lens  220  may be smaller than or equal to that of the sixth lens  270 . 
         [0111]    The refractive powers of the first to sixth lenses  220  to  270  of the third optical lens system  200  may be dispersed so that an aberration of the third optical lens system  200  is minimized. For example, the first to sixth lenses  220  to  270  may have a refractive power dispersion in which a chromatic aberration of the third optical lens system  200  is minimized. For example, a lens having a relatively low refractive index may be used as the third lens  240 , and a lens having a relatively high refractive index may be used as the fourth lens  250 . 
         [0112]    Also, the optical characteristics of the first to sixth lenses  220  to  270  may vary so that an aberration is minimized. For example, as a method of minimizing a chromatic aberration, a lens having a relatively high Abbe&#39;s number may be used as the third lens  240  and a lens having a relatively low Abbe&#39;s number may be used as the fourth lens  250 . 
         [0113]    In the third optical lens system  200 , the first to sixth lenses  220  to  270  are arranged in this way, and thus an aberration of the third optical lens system  200  may be corrected. 
         [0114]    A portion of the blocking portion  280  provided next to the sixth lens  270  may come into contact with the second surface  270   b  of the sixth lens  270  or may be spaced apart from the second surface  270   b  of the sixth lens  270 . 
         [0115]    An overall focal length and performance of the third optical lens system  200  may vary according to a thickness, a focal length, a position, and the like of each of the first to sixth lenses  220  to  270  included in the third optical lens system  200 . 
         [0116]    The following Table 7 illustrates variables related to the above-described Expressions 1 to 7, values of the variables, and values of Expressions 1 to 7 measured with these variable values in the third optical lens system  200 . 
         [0000]    
       
         
               
               
               
             
               
               
               
             
           
               
                   
                 TABLE 7 
               
               
                   
                   
               
               
                   
                 Item 
                 Value 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 IH 
                 6.87 
               
               
                   
                 Semi IH 
                 3.43 
               
               
                   
                 TTL 
                 5.20 
               
               
                   
                 OAL 
                 4.01 
               
               
                   
                 FOV 
                 98.92 
               
               
                   
                 θ 
                 49.46 
               
               
                   
                 E.F.L 
                 2.83 
               
               
                   
                 B.F.L 
                 1.19 
               
               
                   
                 Fno 
                 1.89 
               
               
                   
                 tan(θd/2) 
                 0.461 
               
               
                   
                 DL1 
                 3.782 
               
               
                   
                 DL3 
                 1.660 
               
               
                   
                 DL6 
                 5.702 
               
               
                   
                 D L1-L2   
                 0.853 
               
               
                   
                 Ind3 
                 1.544 
               
               
                   
                 Ind4 
                 1.639 
               
               
                   
                 Abv3 
                 56.093 
               
               
                   
                 Abv4 
                 23.517 
               
               
                   
                 Expression 1 
                 98.92 
               
               
                   
                 Expression 2 
                 0.76 
               
               
                   
                 Expression 3 
                 Satisfied 
               
               
                   
                 Expression 4 
                 Satisfied 
               
               
                   
                 Expression 5 
                 0.21 
               
               
                   
                 Expression 6 
                 0.94 
               
               
                   
                 Expression 7 
                 2.39 
               
               
                   
                   
               
             
          
         
       
     
         [0117]    The values of Expressions 1 to 7 in Table 7 are in the range of Expressions 1 to 7. Therefore, it may be seen that the third optical lens system  200  also satisfies Expressions 1 to 7. 
         [0118]    The following Table 8 illustrates an implementation example of optical characteristics for each of the members (the lenses, the stop, the blocking portion, and the image sensor) included in the third optical lens system  200 , and illustrates radiuses of curvature (R), lens thicknesses or distances (T) between the lenses or adjacent components, refractive indexes (Nd), and Abbe&#39;s numbers (Vd). The refractive index (Nd) denotes a refractive index of a lens measured using a d-line. The Abbe&#39;s number (Vd) denotes an Abbe&#39;s number of a lens with respect to a d-line. A mark * after a surface number indicates that the corresponding surface is an aspherical surface. Units of values of R and T are mm. 
         [0000]    
       
         
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 8 
               
               
                   
               
               
                 Component 
                 Surface 
                 R 
                 T 
                 Nd 
                 Vd 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 First lens 220 
                 220a* 
                 −5.67700 
                 0.49137 
                 1.53175 
                 55.85588 
               
               
                   
                 220b* 
                 −2.45419 
                 0.06818 
                 — 
                 — 
               
               
                 Second lens 230 
                 230a* 
                 1.68712 
                 0.29354 
                 1.63916 
                 23.51650 
               
               
                   
                 230b* 
                 1.18827 
                 0.40781 
                 — 
                 — 
               
               
                 Stop S3 
                   
                 Infinity 
                 0.07544 
               
               
                 Third lens 240 
                 240a* 
                 3.89121 
                 0.47992 
                 1.54410 
                 56.09278 
               
               
                   
                 240b* 
                 −2.56440 
                 0.40893 
                 — 
                 — 
               
               
                 Fourth lens 250 
                 250a* 
                 −3.43376 
                 0.20000 
                 1.63916 
                 23.51650 
               
               
                   
                 250b* 
                 −24.69074 
                 0.22990 
                 — 
                 — 
               
               
                 Fifth lens 260 
                 260a* 
                 −2.48594 
                 0.77873 
                 1.54410 
                 56.09278 
               
               
                   
                 260b* 
                 −0.87018 
                 0.03000 
                 — 
                 — 
               
               
                   
                 270a* 
                 1.93808 
                 0.55094 
                 1.53175 
                 55.85588 
               
               
                 Sixth lens 270 
                 270b* 
                 0.74407 
                 0.56066 
                 — 
                 — 
               
               
                 Blocking 
                 Front 
                 Infinity 
                 0.21000 
                 1.51680 
                 64.19733 
               
               
                 portion 280 
                 surface 
               
               
                   
                 Back 
                 Infinity 
                 0.41333 
                 — 
                 — 
               
               
                   
                 surface 
               
               
                 Image sensor 290 
                   
                 Infinity 
                 0.00123 
               
               
                   
               
             
          
         
       
     
         [0119]    The aspherical surface of each of the first to sixth lenses  220  to  270  included in the third optical lens system  200  satisfy Expression 8. 
         [0120]    The following Table 9 illustrates aspherical coefficients of each surface of the lenses included in the third optical lens system  200 . 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 9 
               
               
                   
               
             
             
               
                 Surface 
                 K 
                 A 
                 B 
                 C 
                 D 
                 E 
               
               
                   
               
               
                 220a* 
                 −96.51954 
                 0.09079 
                 −0.05750 
                 0.03337 
                 −0.01424 
                 0.00474 
               
               
                 220b* 
                 −89.05781 
                 0.08826 
                 −0.11634 
                 0.12751 
                 −0.09736 
                 0.04976 
               
               
                 230a* 
                 −0.18732 
                 0.26033 
                 −2.01495 
                 6.79782 
                 −17.16013 
                 30.59851 
               
               
                 230b* 
                 0.82345 
                 −0.44162 
                 1.56904. 
                 −13.44060 
                 69.13900 
                 −230.75298 
               
               
                 240a* 
                 1.80512 
                 0.00195 
                 −0.06971 
                 −0.15765 
                 2.95436 
                 −15.35725 
               
               
                 240b* 
                 1.55626 
                 −0.13191 
                 0.71777 
                 −5.62696 
                 26.28551 
                 −77.94579 
               
               
                 250a* 
                 6.87682 
                 −0.27024 
                 0.16475 
                 −2.26420 
                 11.39031 
                 −27.89602 
               
               
                 250b* 
                 135.85730 
                 −0.06475 
                 −0.36147 
                 0.67292 
                 −0.29718 
                 −0.38418 
               
               
                 260a* 
                 1.81911 
                 0.24991 
                 −0.29235 
                 0.01569 
                 0.37655 
                 −0.45177 
               
               
                 260b* 
                 −0.87317 
                 0.31798 
                 −0.45982 
                 0.64106 
                 −0.67504 
                 0.46473 
               
               
                 270a 
                 −12.04534 
                 −0.07702 
                 −0.03333 
                 0.05076 
                 −0.02492 
                 0.00687 
               
               
                 270b 
                 −4.16813 
                 −0.07851 
                 0.03330 
                 −0.01126 
                 0.00281 
                 −0.00050 
               
               
                   
               
             
          
           
               
                 Surface 
                 F 
                 G 
                 H 
                 J 
               
               
                   
               
               
                 220a* 
                 −0.00132 
                 0.00029 
                 −0.00004 
                 0.00000 
               
               
                 220b* 
                 −0.01681 
                 0.00361 
                 −0.00045 
                 0.00002 
               
               
                 230a* 
                 −36.83343 
                 28.35302 
                 −12.55851 
                 2.42942 
               
               
                 230b* 
                 495.65192 
                 −661.49763 
                 498.28334 
                 −162.17304 
               
               
                 240a* 
                 41.45228 
                 −62.24450 
                 49.55720 
                 −16.23274 
               
               
                 240b* 
                 147.14972 
                 −170.72170 
                 110.79375 
                 −30.63908 
               
               
                 250a* 
                 40.63591 
                 −35.34601 
                 16.88664 
                 −3.40690 
               
               
                 250b* 
                 0.71705 
                 −0.51770 
                 0.18372 
                 −0.02630 
               
               
                 260a* 
                 0.27389 
                 −0.10352 
                 0.02484 
                 −0.00289 
               
               
                 260b* 
                 −0.16864 
                 0.01793 
                 0.00540 
                 −0.00122 
               
               
                 270a* 
                 −0.00113 
                 0.00010 
                 0.00000 
                 0.00000 
               
               
                 270b* 
                 0.00006 
                 0.00000 
                 0.00000 
                 0.00000 
               
               
                   
               
             
          
         
       
     
         [0121]      FIGS. 10 to 12  illustrate longitudinal spherical aberrations, astigmatic field curvatures, and distortion of the third optical lens system  200  when the lenses included in the third optical lens system  200  have dimensions and aspherical coefficients according to the above implementation example. Light used for obtaining the results of  FIGS. 10 to 12  may be the same as the light used for obtaining the results of  FIGS. 2 to 4 . 
         [0122]    First to fifth graphs G 01  to G 05  of  FIG. 10  may respectively correspond to the first to fifth graphs G 1  to G 5  of  FIG. 2 . Also, first and second graphs G 11  and G 22  of  FIG. 11  may respectively correspond to the first and second graphs G 31  and G 32  of  FIG. 3 . 
         [0123]    The disclosed photographic optical lens systems satisfy Expressions 1 to 7. Therefore, since the disclosed optical lens systems satisfy Expressions 1 to 5, a relatively wide viewing angle, that is, a wide angle, along with high resolution may be secured. 
         [0124]    Also, since the refractive power distributions of the lenses of the disclosed optical lens systems are adjusted so that the disclosed optical lens systems satisfy Expressions 6 and 7, various aberrations including a chromatic aberration in the disclosed optical lens systems may be corrected. 
         [0125]    In addition, since the total lengths of the disclosed optical lens systems are defined so that the disclosed optical lens systems satisfy Expression 2 with respect to sizes of image sensors, the entire optical lens systems may be miniaturized and slimmed. Accordingly, the disclosed optical lens systems may be applied to various apparatuses requiring a compact size and a wide angle while requiring image capturing, and may be applied to, for example, mobile communication devices, security cameras, action cameras, drones, and the like. 
         [0126]    Also, since a low sensitivity design may be achieved while implementing a high optical performance due to a power arrangement dispersion according to an appropriate stop position setting, mass production may also be ensured. 
         [0127]    Also, since each lens is made of plastic and an aspherical surface is applied thereto, a weight of the lens may be reduced, a manufacturing cost may be reduced, and a compact photographing lens having a high resolution and a wide angle may be implemented when compared to the lens made of glass. 
         [0128]    While many details have been described in the above description, these will be construed as exemplary aspects of the disclosed embodiment rather than limiting the scope of the inventive concept. Therefore, the technical scope of the inventive concept is not defined by the described aspects of the disclosed embodiment, but will be defined by the scope of the appended claims. 
         [0129]    It should be understood that aspects of the disclosed embodiment described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features within each aspect of the disclosed embodiment should typically be considered as available for other similar features in other aspects of the disclosed embodiment. 
         [0130]    While one or more aspects of the disclosed embodiment have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the following claims.