Abstract:
A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group. The second lens group includes a positive lens element, and two negative lens elements. The following conditions (1) and (2) are satisfied: 
       2.0&lt;| VD   1   t−VD   1   w |/( ft/fw )&lt; 3.4    (1),
 
       and 
       0.89&lt;| m   2   w/m   3   w|   (2),
 
     wherein VD 1   t  and VD 1   w  designate the distances, at the long and short focal length extremities, from the image-side surface of the lens element provided closest to the image side within the first lens group to the object-side surface of the positive lens element provided closest to the object side within the second lens group; ft and fw designate the entire focal length of the zoom lens system at the long and short focal length extremities; and m 2   w  and m 3   w  designate the lateral magnification of the second and third lens groups at the short focal length extremity when focused on an object at infinity.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a zoom lens system that is provided for imaging. 
         [0003]    2. Description of Related Art 
         [0004]    Due to the rapid popularization of digital cameras in recent years, lower-priced digital cameras have been in demand, and also there has been a strong demand for price reduction in regard to photographic optical systems. Furthermore, in compact digital cameras, there is a tendency for excellent portability to be desired, so that attempts are made to further miniaturize and slim down the digital camera. On the other hand, the number of pixels of solid-state image sensors, such as CCDs, etc., is increasing year by year. Accordingly, a high-quality photographic optical system that can cope with such fineness of pixel pitch is in demand. 
         [0005]    A negative-lead zoom lens system is utilized as a zoom lens system for use in a compact digital camera having a zoom ratio of approximately 3:1 through 4:1. For example, Japanese Unexamined Patent Publication Nos. 2005-084597 and 2009-092740 both disclose a negative-lead zoom lens system having a negative lens group, a positive lens group and a positive lens group, in that order from the object side, i.e., a zoom lens system having three lens groups, in which a zoom ratio of approximately 3.7:1 is achieved. 
         [0006]    However, the overall length of these optical systems and the thickness of each lens group are large, and hence do not satisfy the requirements for miniaturization. In order to achieve miniaturization of a camera at a non-photographable state, it is necessary for the overall length of the lens system to be reduced and for the thickness of each lens group to be made thinner. In order to shorten the overall length of the lens system, the refractive power of each lens group can be strengthened and the amount movement thereof during zooming can be reduced; however, the amount of aberrations occurring at the refractive surfaces of the lens elements increases so that aberration correction thereof becomes difficult. Moreover, the market demands such lens systems to be further miniaturized while attaining a higher zoom ratio and a higher optical quality. 
       SUMMARY OF THE INVENTION 
       [0007]    The present invention has been devised with the above-mentioned issued in mind, and provides a zoom lens system that simultaneously achieves further miniaturization, a higher zoom ratio and a higher optical quality. 
         [0008]    According to an aspect of the present invention, a zoom lens system is provided, including a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short focal length extremity to the long focal length extremity, each of the first through third lens groups move along the optical axis. The second lens group includes a positive lens element, a negative lens element and a negative lens element, in that order from the object side, and wherein the following conditions (1) and (2) are satisfied: 
         [0000]      2.0 &lt;|VD 1 t−VD 1 w |/( ft/fw )&lt;3.4(mm).   (1),
 
         [0000]      and 
         [0000]      0.89 &lt;|m 2 w/m 3 w|   (2),
 
         [0000]    wherein VD 1   t  designates the distance (mm) along the optical axis, at the long focal length extremity, from the surface on the image side of the lens element provided closest to the image side within the first lens group to the surface on the object side of the positive lens element provided closest to the object side within the second lens group; VD 1   w  designates the distance (mm) along the optical axis, at the short focal length extremity, from the surface on the image side of the lens element provided closest to the image side within the first lens group to the surface on the object side of the positive lens element provided closest to the object side within the second lens group; ft designates the focal length (mm) of the entire zoom lens system at the long focal length extremity; fw designates the focal length (mm) of the entire zoom lens system at the short focal length extremity; m 2   w  designates the lateral magnification of the second lens group at the short focal length extremity when focused on an object at infinity; and m 3   w  designates the lateral magnification of the third lens group at the short focal length extremity when focused on an object at infinity. 
         [0009]    It is desirable for the following condition (3) to be satisfied: 
         [0000]      2.8 &lt;f 2/ rb &lt;4.0 (3), wherein  f 2 
         [0000]    designates the combined focal length of the second lens group, and rb designates the radius of curvature of the surface on the image side of the negative lens element provided closest to the image side within the second lens group. 
         [0010]    It is desirable for the positive lens element and the negative lens element, which is provided on the object side within the second lens group, to be bonded to each other to constitute a cemented lens. 
         [0011]    It is desirable for the negative lens element provided on the image side within the second lens group to be a resin lens element provided with aspherical surfaces on both sides thereof. 
         [0012]    It is desirable for the third lens group to be one positive lens element that constitutes a focusing lens group that is moved along the optical axis thereof during a focusing operation, and wherein the one positive lens element is made of resin and is provided with at least one aspherical surface. 
         [0013]    According to the present invention, a zoom lens system is provided that simultaneously achieves further miniaturization, a higher zoom ratio and a higher optical quality. 
         [0014]    The present disclosure relates to subject matter contained in Japanese Patent Application No. 2010-41487 (filed on Feb. 26, 2010) and No. 2010-234411 (filed on Oct. 19, 2010) which are expressly incorporated herein in their entireties. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0015]    The present invention will be discussed below in detail with reference to the accompanying drawings, in which: 
           [0016]      FIG. 1  shows a lens arrangement of a first numerical embodiment of the zoom lens system, according to the present invention, at the long focal length extremity when focused on an object at infinity; 
           [0017]      FIGS. 2A ,  2 B,  2 C and  2 D show various aberrations that occurred in the lens arrangement shown in  FIG. 1 ; 
           [0018]      FIG. 3  shows a lens arrangement of the first numerical embodiment of the zoom lens system at an intermediate focal length when focused on an object at infinity; 
           [0019]      FIGS. 4A ,  4 B,  4 C and  4 D show various aberrations that occurred in the lens arrangement shown in  FIG. 3 ; 
           [0020]      FIG. 5  shows a lens arrangement of the first numerical embodiment of the zoom lens system at the short focal length extremity when focused on an object at infinity; 
           [0021]      FIGS. 6A ,  6 B,  6 C and  6 D show various aberrations that occurred in the lens arrangement shown in  FIG. 5 ; 
           [0022]      FIG. 7  shows a lens arrangement of a second numerical embodiment of the zoom lens system, according to the present invention, at the long focal length extremity when focused on an object at infinity; 
           [0023]      FIGS. 8A ,  8 B,  8 C and  8 D show various aberrations that occurred in the lens arrangement shown in  FIG. 7 ; 
           [0024]      FIG. 9  shows a lens arrangement of the second numerical embodiment of the zoom lens system at an intermediate focal length when focused on an object at infinity; 
           [0025]      FIGS. 10A ,  10 B,  10 C and  10 D show various aberrations that occurred in the lens arrangement shown in  FIG. 9 ; 
           [0026]      FIG. 11  shows a lens arrangement of the second numerical embodiment of the zoom lens system at the short focal length extremity when focused on an object at infinity; 
           [0027]      FIGS. 12A ,  12 B,  12 C and  12 D show various aberrations that occurred in the lens arrangement shown in  FIG. 11 ; 
           [0028]      FIG. 13  shows a lens arrangement of a third numerical embodiment of the zoom lens system, according to the present invention, at the long focal length extremity when focused on an object at infinity; 
           [0029]      FIGS. 14A ,  14 B,  14 C and  14 D show various aberrations that occurred in the lens arrangement shown in  FIG. 13 ; 
           [0030]      FIG. 15  shows a lens arrangement of the third numerical embodiment of the zoom lens system at an intermediate focal length when focused on an object at infinity; 
           [0031]      FIGS. 16A ,  16 B,  16 C and  16 D show various aberrations that occurred in the lens arrangement shown in  FIG. 15 ; 
           [0032]      FIG. 17  shows a lens arrangement of the third numerical embodiment of the zoom lens system at the short focal length extremity when focused on an object at infinity; 
           [0033]      FIGS. 18A ,  18 B,  18 C and  18 D show various aberrations that occurred in the lens arrangement shown in  FIG. 17 ; 
           [0034]      FIG. 19  shows a lens arrangement of a fourth numerical embodiment of the zoom lens system, according to the present invention, at the long focal length extremity when focused on an object at infinity; 
           [0035]      FIGS. 20A ,  20 B,  20 C and  20 D show various aberrations that occurred in the lens arrangement shown in  FIG. 19 ; 
           [0036]      FIG. 21  shows a lens arrangement of the fourth numerical embodiment of the zoom lens system at an intermediate focal length when focused on an object at infinity; 
           [0037]      FIGS. 22A ,  22 B,  22 C and  22 D show various aberrations that occurred in the lens arrangement shown in  FIG. 21 ; 
           [0038]      FIG. 23  shows a lens arrangement of the fourth numerical embodiment of the zoom lens system at the short focal length extremity when focused on an object at infinity; 
           [0039]      FIGS. 24A ,  24 B,  24 C and  24 D show various aberrations that occurred in the lens arrangement shown in  FIG. 23 ; 
           [0040]      FIG. 25  shows a lens arrangement of a fifth numerical embodiment of the zoom lens system, according to the present invention, at the long focal length extremity when focused on an object at infinity; 
           [0041]      FIGS. 26A ,  26 B,  26 C and  26 D show various aberrations that occurred in the lens arrangement shown in  FIG. 25 ; 
           [0042]      FIG. 27  shows a lens arrangement of the fifth numerical embodiment of the zoom lens system at an intermediate focal length when focused on an object at infinity; 
           [0043]      FIGS. 28A ,  28 B,  28 C and  28 D show various aberrations that occurred in the lens arrangement shown in  FIG. 27 ; 
           [0044]      FIG. 29  shows a lens arrangement of the fifth numerical embodiment of the zoom lens system at the short focal length extremity when focused on an object at infinity; 
           [0045]      FIGS. 30A ,  30 B,  30 C and  30 D show various aberrations that occurred in the lens arrangement shown in  FIG. 29 ; and 
           [0046]      FIG. 31  shows a zoom path of the zoom lens system according to the present invention. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0047]    The zoom lens system according to the present invention includes a negative first lens group G 1 , a positive second lens group G 2 , and a positive third lens group G 3 , in that order from the object side, as shown in the zoom path diagram of  FIG. 31 . A diaphragm S is provided in between the first lens group G 1  and the second lens group G 2  and moves integrally with the second lens group G 2 . “I” designates the imaging plane. 
         [0048]    Upon zooming from the short focal length extremity (W) to the long focal length extremity (T), the first through third lens groups G 1  through G 3  move along the optical axis in a manner such that the distance between the first lens group G 1  and the second lens group G 2  decreases, and the distance between the second lens group G 2  and the third lens group G 3  increases. More specifically, upon zooming from the short focal length extremity (W) to the long focal length extremity (T), the first lens group G 1  first moves toward the image side and thereafter moves toward the object side, the second lens group G 2  monotonically moves toward the object side, and the third lens group G 3  moves monotonically toward the image side. 
         [0049]    The first lens group G 1  is configured of a negative lens element  10  and a positive lens element  11 , in that order from the object side. The negative lens element  10  is a negative biconcave lens element (numerical embodiments 1 through 4) or is a negative meniscus lens element (numerical embodiment 5) having a convex surface on the object side. In each of the first through fifth numerical embodiments, the positive lens element  11  is a positive meniscus lens element having a convex surface on the object side and having an aspherical surface on each side thereof. 
         [0050]    As shown in the lens arrangements of the first through fifth embodiments, the second lens group G 2  is configured of a cemented lens  22  having a positive lens element  20  and a negative lens element  21 , in that order from the object side, and a negative lens element  23 , in that order from the object side. The positive lens element  20  is a positive biconvex lens element and the negative lens element  21  is a biconcave negative lens element. The negative lens element  23  is a negative meniscus lens element having a convex surface on the object side and is a resin lens having an aspherical surface on each side thereof. 
         [0051]    The third lens group G 3  is a focusing lens group that is moved during a focusing operation and is configured of a single positive lens element  30 . The positive lens element  30  is configured of a biconvex positive lens element (first through third and fifth numerical embodiments) or a positive meniscus lens element (fourth numerical embodiment) having a convex surface on the image side and is a resin lens having an aspherical surface on each side thereof. 
         [0052]    Condition (1) specifies the ratio of the change in distance between the first and second lens groups G 1  and G 2  during zooming to the zoom ratio of the zoom lens system, in order to achieve further miniaturization, a higher zoom ratio and a higher quality. 
         [0053]    In order to achieve a small (miniaturized) zoom lens system that has a high zoom ratio, the refractive power of each lens group can be strengthened, and the distance between the first lens group G 1  and the second lens group G 2  that contribute to zooming can be shortened. However, if the upper limit of condition (1) is exceeded, the refractive power of each lens group becomes weak, which is advantageous with respect to aberration correction; however, in order attain a desired zoom ratio, it is necessary to increase the distance between the first lens group G 1  and the second lens group G 2 , causing difficulties in achieving miniaturization. If the lower limit of condition (1) is exceeded, the refractive power of each lens group (first and second lens groups G 1  and G 2 ) that contributes to zooming is strengthened, which is advantageous for further miniaturizing the zoom lens system, however, aberration correction becomes difficult. 
         [0054]    Condition (2) specifies the ratio of the lateral magnification of the second lens group G 2  to that of the third lens group G 3  when focusing on an object at infinity at the short focal length extremity. Satisfying condition (2) enables further miniaturization of the zoom lens system. 
         [0055]    If the lower limit of condition (2) is exceeded, the refractive power of the second lens group G 2  weakens, which is advantageous for aberration correction; however, since the distance along the optical axis from the second lens group G 2  to the imaging plane increases, miniaturization of the zoom lens system becomes difficult. 
         [0056]    Condition (3) specifies the ratio of the combined focal length of the second lens group G 2  to the radius of curvature of the surface on the image side of the lens element provided closest to the image side within the second lens group G 2 . Satisfying condition (3) enables a reduction in the overall length of the zoom lens system. 
         [0057]    If the upper limit of condition (3) is exceeded, the abaxial light rays passing through the zoom lens system diverge so it becomes difficult to maintain telecentricity. 
         [0058]    If the lower limit of condition (3) is exceeded, the diverging effect of the abaxial light rays at the short focal length extremity becomes small, so that the overall length of the zoom lens system cannot be adequately shortened. 
         [0059]    The second lens group G 2 , as shown in each numerical embodiment, is configured of a positive lens element, a negative lens element and a negative lens element, in that order from the object side. 
         [0060]    According to this arrangement, it is desirable for the third lens element within the second lens group G 2  (i.e., the negative lens element on the image side) to be a resin lens having an aspherical surface on each side thereof in order to achieve a higher optical quality and reduce costs. The aspherical surfaces correct spherical and coma aberrations over the entire zooming range; moreover, by forming both of these surfaces as aspherical surfaces, the aberration correction burden is shared so that occurrence of aberrations can be reduced at each aspherical surface. Accordingly, it becomes possible to reduce the sensitivity of optical quality deterioration due to decentration of the lens elements occurring during assembly. 
         [0061]    The third lens group G 3 , which is a focusing lens group that is moved during focusing, is a positive single lens element made of resin having an aspherical surface on each side in each of the numerical embodiments; however, it is sufficient for at least one surface thereof to be formed as an aspherical surface. According to such an arrangement, a reduction in cost can be achieved while deterioration of the optical quality can be reduced during focusing from an object at infinity to an object located at a close distance. 
       Embodiments  
       [0062]    Specific numerical embodiments will be herein discussed. The following numerical embodiments correspond to a zoom lens system used in a photographic camera, an electronic still camera or a video camera. In the aberration diagrams and the tables, the d-line, g-line, C-line, F-line and e-line show aberrations at their respective wave-lengths; S designates the sagittal image, M designates the meridional image, F no. designates the f-number, f designates the focal length of the entire optical system, W designates the half angle of view (°), Y designates the image height, fB designates the backfocus, L designates the overall length of the lens system, r designates the radius of curvature, d designates the lens thickness or distance between lenses, Nd designates the refractive index of the d-line, and vd designates the Abbe&#39;s number at the d-line. The values for the f-number, the focal length, the half angle-of-view, the image height, the backfocus, the overall length of the lens system, and the distance between lenses (which changes during zooming and according to the overall length of the lens system) are shown in the following order: short focal length extremity, intermediate focal length, and long focal length extremity. 
         [0063]    An aspherical surface which is rotationally symmetrical about the optical axis is defined as: 
         [0000]        x=cy   2 /(1+[1−{1 +K}c   2   y   2 ] 1/2 )+ A 4 y   4   +A 6y 6   +A 8 y   8   +A 10 y   10   +A 12 y   12  
 
         [0064]    wherein ‘x’ designates a distance from a tangent plane of the aspherical vertex, ‘c’ designates the curvature (1/r) of the aspherical vertex, ‘y’ designates the distance from the optical axis, ‘K’ designates the conic coefficient, A4 designates a fourth-order aspherical coefficient, A6 designates a sixth-order aspherical coefficient, A8 designates an eighth-order aspherical coefficient, A10 designates a tenth-order aspherical coefficient, and A12 designates a twelfth-order aspherical coefficient. 
       Embodiment 1  
       [0065]      FIGS. 1 through 6D  and Tables 1 through 4 show a first numerical embodiment of a zoom lens system according to the present invention.  FIG. 1  shows a lens arrangement of the first numerical embodiment of the zoom lens system at the long focal length extremity when focused on an object at infinity.  FIGS. 2A ,  2 B,  2 C and  2 D show various aberrations that occurred in the lens arrangement shown in  FIG. 1 .  FIG. 3  shows a lens arrangement of the first numerical embodiment of the zoom lens system at an intermediate focal length when focused on an object at infinity.  FIGS. 4A ,  4 B,  4 C and  4 D show various aberrations that occurred in the lens arrangement shown in  FIG. 3 .  FIG. 5  shows a lens arrangement of the first numerical embodiment of the zoom lens system at the short focal length extremity when focused on an object at infinity.  FIGS. 6A ,  6 B,  6 C and  6 D show various aberrations that occurred in the lens arrangement shown in  FIG. 5 . Table 1 shows the lens surface data, Table 2 shows various zoom lens system data, Table 3 shows the aspherical surface data, and Table 4 shows the zoom lens group data of the first numerical embodiment. 
         [0066]    The zoom lens system of the first numerical embodiment is configured of a negative first lens group G 1 , a positive second lens group G 2 , and a positive third lens group G 3 , in that order from the object side. 
         [0067]    The first lens group G 1  (surface Nos.  1  through  4 ) is configured of a biconcave negative lens element  10  and a positive meniscus lens element  11  having a convex surface on the object side, in that order from the object side. Both sides of the positive meniscus lens element  11  are aspherical surfaces. 
         [0068]    The second lens group G 2  (surface Nos.  6  through  10 ) is configured of a cemented lens  22  having a biconvex positive lens element  20  and a biconcave negative lens element  21 , in that order from the object side, and a negative meniscus lens element  23  having a convex surface on the object side, in that order from the object side. The negative meniscus lens element  23  is a resin lens having an aspherical surface formed on each side thereof. A diaphragm S (surface No.  5 ) is provided in between the first lens group G 1  and the second lens group G 2  and moves integrally with the second lens group G 2 . 
         [0069]    The third lens group G 3  (surface Nos.  11  and  12 ) is configured of one biconvex positive lens element  30  which constitutes a focusing lens group that is moved along the optical axis during focusing. The biconvex positive lens element  30  is a resin lens having an aspherical surface on each side. An optical filter OP (surface Nos.  13  and  14 ) and a cover glass CG (surface Nos.  15  and  16 ) are provided behind the third lens group G 3  (the biconvex positive lens element  30 ) between the third lens group G 3  and the imaging plane I. 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                 LENS SURFACE DATA 
               
             
          
           
               
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 νd 
               
               
                   
               
             
          
           
               
                 1 
                 −138.945 
                 0.700 
                 1.75500 
                 52.3 
               
               
                 2 
                 6.478 
                 1.090 
               
               
                  3* 
                 8.391 
                 1.640 
                 1.82115 
                 24.1 
               
               
                  4* 
                 14.646 
                 d4 
               
               
                 5 
                 ∞ 
                 0.500 
               
               
                 (Diaphragm) 
               
               
                 6 
                 4.831 
                 1.600 
                 1.88300 
                 40.8 
               
               
                 7 
                 −8.323 
                 0.700 
                 1.75211 
                 25.0 
               
               
                 8 
                 8.323 
                 0.110 
               
               
                  9* 
                 4.539 
                 0.800 
                 1.60641 
                 27.2 
               
               
                 10* 
                 3.169 
                 d10 
               
               
                 11* 
                 69.562 
                 1.950 
                 1.54358 
                 55.7 
               
               
                 12* 
                 −8.970 
                 d12 
               
               
                 13  
                 ∞ 
                 0.350 
                 1.51680 
                 64.2 
               
               
                 14  
                 ∞ 
                 0.510 
               
               
                 15  
                 ∞ 
                 0.500 
                 1.51680 
                 64.2 
               
               
                 16  
                 ∞ 
                 — 
               
               
                   
               
               
                 The asterisk (*) designates an aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                 ZOOM LENS SYSTEM DATA 
               
               
                 Zoom Ratio 3.86 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                   
                 Short Focal Length Extremity 
               
               
                   
                 Fno. 
                 3.0 
               
               
                   
                 f 
                 5.00 
               
               
                   
                 W 
                 43.4 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 29.78 
               
               
                   
                 d4 
                 12.700 
               
               
                   
                 d10 
                 2.457 
               
               
                   
                 d12 
                 3.399 
               
               
                   
                   
                 Intermediate Focal Length 
               
               
                   
                 Fno. 
                 4.4 
               
               
                   
                 f 
                 9.80 
               
               
                   
                 W 
                 22.0 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 28.18 
               
               
                   
                 d4 
                 5.647 
               
               
                   
                 d10 
                 9.007 
               
               
                   
                 d12 
                 2.304 
               
               
                   
                   
                 Long Focal Length Extremity 
               
               
                   
                 Fno. 
                 6.1 
               
               
                   
                 f 
                 19.30 
               
               
                   
                 W 
                 11.5 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 32.85 
               
               
                   
                 d4 
                 1.270 
               
               
                   
                 d10 
                 18.508 
               
               
                   
                 d12 
                 1.850 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 3 
               
             
             
               
                   
               
               
                 ASPHERICAL SURFACE DATA (aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
             
          
           
               
                 Surf. No. 
                 κ 
                 A4 
                 A6 
                 A8 
                 A10 
               
               
                   
               
             
          
           
               
                 3 
                 0.000 
                 −0.2552 × 10 −3   
                 0.4700 × 10 −5   
                 −0.3106 × 10 −6   
                   
               
               
                 4 
                 0.000 
                 −0.4522 × 10 −3   
                 0.2326 × 10 −5   
                 −0.3545 × 10 −6   
               
               
                 9 
                 0.000 
                 −0.2441 × 10 −2   
                 0.1215 × 10 −3   
                 −0.2283 × 10 −3   
                 0.2751 × 10 −4   
               
               
                 10 
                 −0.251 
                  0.1375 × 10 −2   
                 0.8698 × 10 −3   
                 −0.5452 × 10 −3   
                 0.7753 × 10 −4   
               
               
                 11 
                 0.000 
                  0.5377 × 10 −3   
                 −0.4626 × 10 −5    
                  0.7597 × 10 −7   
                 0.1298 × 10 −7   
               
               
                 12 
                 0.000 
                  0.9573 × 10 −3   
                 −0.4071 × 10 −5    
                 −0.2458 × 10 −6   
                 0.2221 × 10 −7   
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 4 
               
             
             
               
                   
               
               
                 ZOOM LENS GROUP DATA 
               
             
          
           
               
                 Lens Group 
                 First Surface 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −13.27 
               
               
                 2 
                 6 
                 9.52 
               
               
                 3 
                 11 
                 14.75 
               
               
                   
               
             
          
         
       
     
       Embodiment 2  
       [0070]      FIGS. 7 through 12D  and Tables 5 through 8 show a second numerical embodiment of a zoom lens system according to the present invention.  FIG. 7  shows a lens arrangement of the second numerical embodiment of the zoom lens system at the long focal length extremity when focused on an object at infinity.  FIGS. 8A ,  8 B,  8 C and  8 D show various aberrations that occurred in the lens arrangement shown in  FIG. 7 .  FIG. 9  shows a lens arrangement of the second numerical embodiment of the zoom lens system at an intermediate focal length when focused on an object at infinity.  FIGS. 10A ,  10 B,  100  and  10 D show various aberrations that occurred in the lens arrangement shown in  FIG. 9 .  FIG. 11  shows a lens arrangement of the second numerical embodiment of the zoom lens system at the short focal length extremity when focused on an object at infinity.  FIGS. 12A ,  12 B,  12 C and  12 D show various aberrations that occurred in the lens arrangement shown in  FIG. 11 . Table 5 shows the lens surface data, Table 6 shows various zoom lens system data, Table 7 shows the aspherical surface data, and Table 8 shows the zoom lens group data of the second numerical embodiment. 
         [0071]    The lens arrangement of the second numerical embodiment is the same as that of first numerical embodiment, except for the diaphragm S being positioned in a plane that is tangent to the front surface of the second lens group G 2  (the biconvex positive lens element  20 ). 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 5 
               
             
             
               
                   
               
               
                 LENS SURFACE DATA 
               
             
          
           
               
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 νd 
               
               
                   
               
             
          
           
               
                 1 
                 −131.152 
                 0.700 
                 1.75500 
                 52.3 
               
               
                 2 
                 6.483 
                 1.084 
               
               
                  3* 
                 8.415 
                 1.646 
                 1.82115 
                 24.1 
               
               
                  4* 
                 14.818 
                 d4 
               
               
                 5 
                 ∞ 
                 0.000 
               
               
                 (Diaphragm) 
               
               
                 6 
                 4.827 
                 1.600 
                 1.88300 
                 40.8 
               
               
                 7 
                 −8.315 
                 0.700 
                 1.75211 
                 25.0 
               
               
                 8 
                 8.315 
                 0.110 
               
               
                  9* 
                 4.571 
                 0.800 
                 1.60641 
                 27.2 
               
               
                 10* 
                 3.182 
                 d10 
               
               
                 11* 
                 88.696 
                 1.950 
                 1.54358 
                 55.7 
               
               
                 12* 
                 −8.671 
                 d12 
               
               
                 13  
                 ∞ 
                 0.350 
                 1.51680 
                 64.2 
               
               
                 14  
                 ∞ 
                 0.510 
               
               
                 15  
                 ∞ 
                 0.500 
                 1.51680 
                 64.2 
               
               
                 16  
                 ∞ 
                 — 
               
               
                   
               
               
                 The asterisk (*) designates an aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
           
               
                 TABLE 6 
               
               
                   
               
               
                 ZOOM LENS SYSTEM DATA 
               
               
                 Zoom Ratio 3.86 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                   
                 Short Focal Length Extremity 
               
               
                   
                 Fno. 
                 3.1 
               
               
                   
                 f 
                 5.00 
               
               
                   
                 W 
                 43.4 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 29.79 
               
               
                   
                 d4 
                 13.200 
               
               
                   
                 d10 
                 2.462 
               
               
                   
                 d12 
                 3.409 
               
               
                   
                   
                 Intermediate Focal Length 
               
               
                   
                 Fno. 
                 4.6 
               
               
                   
                 f 
                 9.80 
               
               
                   
                 W 
                 22.0 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 28.27 
               
               
                   
                 d4 
                 6.220 
               
               
                   
                 d10 
                 9.093 
               
               
                   
                 d12 
                 2.233 
               
               
                   
                   
                 Long Focal Length Extremity 
               
               
                   
                 Fno. 
                 7.3 
               
               
                   
                 f 
                 19.30 
               
               
                   
                 W 
                 11.5 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 32.85 
               
               
                   
                 d4 
                 1.770 
               
               
                   
                 d10 
                 18.510 
               
               
                   
                 d12 
                 1.850 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE 7 
               
               
                   
               
               
                 ASPHERICAL SURFACE DATA (aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surf. No. 
                 κ 
                 A4 
                 A6 
                 A8 
               
               
                   
               
               
                  3 
                 0.000 
                 −0.2593 × 10 −3   
                 0.4878 × 10 −5   
                 −0.3146 × 10 −6   
               
               
                  4 
                 0.000 
                 −0.4542 × 10 −3   
                 0.2227 × 10 −5   
                 −0.3542 × 10 −6   
               
               
                  9 
                 0.000 
                 −0.2398 × 10 −2   
                 0.1160 × 10 −3   
                 −0.2343 × 10 −3   
               
               
                 10 
                 −0.239 
                   0.1432 × 10 −2   
                 0.8329 × 10 −3   
                 −0.5516 × 10 −3   
               
               
                 11 
                 0.000 
                   0.4458 × 10 −3   
                 −0.6027 × 10 −5    
                   0.2253 × 10 −6   
               
               
                 12 
                 0.000 
                   0.8727 × 10 −3   
                 −0.3809 × 10 −5    
                 −0.1744 × 10 −6   
               
               
                   
               
             
          
           
               
                   
                 Surf. No. 
                 A10 
               
               
                   
                   
               
               
                   
                  9 
                 0.2901 × 10 −4   
               
               
                   
                 10 
                 0.8107 × 10 −4   
               
               
                   
                 11 
                 0.1185 × 10 −7   
               
               
                   
                 12 
                 0.2343 × 10 −7   
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 8 
               
             
             
               
                   
               
               
                 ZOOM LENS GROUP DATA 
               
             
          
           
               
                 Lens Group 
                 First Surface 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −13.30 
               
               
                 2 
                 6 
                 9.53 
               
               
                 3 
                 11 
                 14.63 
               
               
                   
               
             
          
         
       
     
       Embodiment 3  
       [0072]      FIGS. 13 through 18D  and Tables 9 through 12 show a third numerical embodiment of a zoom lens system according to the present invention.  FIG. 13  shows a lens arrangement of the third numerical embodiment of the zoom lens system at the long focal length extremity when focused on an object at infinity.  FIGS. 14A ,  14 B,  14 C and  14 D show various aberrations that occurred in the lens arrangement shown in  FIG. 13 .  FIG. 15  shows a lens arrangement of the third numerical embodiment of the zoom lens system at an intermediate focal length when focused on an object at infinity.  FIGS. 16A ,  16 B,  16 C and  16 D show various aberrations that occurred in the lens arrangement shown in  FIG. 15 .  FIG. 17  shows a lens arrangement of the third numerical embodiment of the zoom lens system at the short focal length extremity when focused on an object at infinity.  FIGS. 18A ,  18 B,  18 C and  18 D show various aberrations that occurred in the lens arrangement shown in  FIG. 17 . Table 9 shows the lens surface data, Table 10 shows various zoom lens system data, Table 11 shows the aspherical surface data, and Table 12 shows the zoom lens group data of the third numerical embodiment. 
         [0073]    The lens arrangement of the third numerical embodiment is the same as that of first numerical embodiment. 
         [0000]    
       
         
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 9 
               
             
             
               
                   
               
               
                 LENS SURFACE DATA 
               
             
          
           
               
                   
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 νd 
               
               
                   
                   
               
             
          
           
               
                   
                  1 
                 −2919.593 
                 0.700 
                 1.75500 
                 52.3 
               
               
                   
                  2 
                 6.625 
                 1.045 
               
               
                   
                  3* 
                 7.085 
                 1.619 
                 1.82115 
                 24.1 
               
               
                   
                  4* 
                 10.332 
                 d4  
               
               
                   
                  5(Diaphragm) 
                 ∞ 
                 0.350 
               
               
                   
                  6 
                 4.872 
                 1.700 
                 1.88300 
                 40.8 
               
               
                   
                  7 
                 −8.546 
                 0.600 
                 1.75211 
                 25.0 
               
               
                   
                  8 
                 8.546 
                 0.100 
               
               
                   
                  9* 
                 4.250 
                 0.800 
                 1.60641 
                 27.2 
               
               
                   
                 10* 
                 2.997 
                 d10 
               
               
                   
                 11* 
                 49.434 
                 2.000 
                 1.54358 
                 55.7 
               
               
                   
                 12* 
                 −8.455 
                 d12 
               
               
                   
                 13 
                 ∞ 
                 0.350 
                 1.51680 
                 64.2 
               
               
                   
                 14 
                 ∞ 
                 0.510 
               
               
                   
                 15 
                 ∞ 
                 0.500 
                 1.51680 
                 64.2 
               
               
                   
                 16 
                 ∞ 
                 — 
               
               
                   
                   
               
               
                   
                 The asterisk (*) designates an aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
           
               
                 TABLE 10 
               
               
                   
               
               
                 ZOOM LENS SYSTEM DATA 
               
               
                 Zoom Ratio 3.86 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                   
                 Short Focal Length Extremity 
               
               
                   
                 Fno. 
                 3.3 
               
               
                   
                 f 
                 5.00 
               
               
                   
                 W 
                 43.1 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 29.49 
               
               
                   
                 d4 
                 12.850 
               
               
                   
                 d10 
                 2.350 
               
               
                   
                 d12 
                 3.245 
               
               
                   
                   
                 Intermediate Focal Length 
               
               
                   
                 Fno. 
                 4.8 
               
               
                   
                 f 
                 9.80 
               
               
                   
                 W 
                 21.7 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 27.78 
               
               
                   
                 d4 
                 5.662 
               
               
                   
                 d10 
                 8.669 
               
               
                   
                 d12 
                 2.410 
               
               
                   
                   
                 Long Focal Length Extremity 
               
               
                   
                 Fno. 
                 6.0 
               
               
                   
                 f 
                 19.30 
               
               
                   
                 W 
                 11.4 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 32.60 
               
               
                   
                 d4 
                 1.420 
               
               
                   
                 d10 
                 18.287 
               
               
                   
                 d12 
                 1.850 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE 11 
               
               
                   
               
               
                 ASPHERICAL SURFACE DATA (aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surf. No. 
                 κ 
                 A4 
                 A6 
                 A8 
               
               
                   
               
               
                  3 
                 0.000 
                 −0.1076 × 10 −3   
                 −0.6232 × 10 −5   
                 −0.8841 × 10 −7   
               
               
                  4 
                 0.000 
                 −0.2139 × 10 −3   
                 −0.1020 × 10 −4   
                   0.3974 × 10 −7   
               
               
                  9 
                 0.000 
                 −0.3294 × 10 −2   
                 −0.1463 × 10 −5   
                 −0.1853 × 10 −3   
               
               
                 10 
                 −0.381 
                   0.8360 × 10 −3   
                   0.1535 × 10 −3   
                 −0.2285 × 10 −3   
               
               
                 11 
                 0.000 
                   0.8275 × 10 −3   
                 −0.2782 × 10 −4   
                   0.1565 × 10 −5   
               
               
                 12 
                 0.000 
                   0.1649 × 10 −2   
                 −0.5186 × 10 −4   
                   0.1982 × 10 −5   
               
               
                   
               
             
          
           
               
                   
                 Surf. No. 
                 A10 
               
               
                   
                   
               
               
                   
                  9 
                 0.2184 × 10 −4   
               
               
                   
                 10 
                 0.3312 × 10 −4   
               
               
                   
                 11 
                 0.1235 × 10 −8   
               
               
                   
                 12 
                 0.1015 × 10 −7   
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 12 
               
             
             
               
                   
               
               
                 ZOOM LENS GROUP DATA 
               
             
          
           
               
                 Lens Group 
                 First Surface 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −13.82 
               
               
                 2 
                 6 
                 9.55 
               
               
                 3 
                 11 
                 13.45 
               
               
                   
               
             
          
         
       
     
       Embodiment 4  
       [0074]      FIGS. 19 through 24D  and Tables 13 through 16 show a fourth numerical embodiment of a zoom lens system according to the present invention.  FIG. 19  shows a lens arrangement of the fourth numerical embodiment of the zoom lens system at the long focal length extremity when focused on an object at infinity.  FIGS. 20A ,  20 B,  20 C and  20 D show various aberrations that occurred in the lens arrangement shown in  FIG. 19 .  FIG. 21  shows a lens arrangement of the fourth numerical embodiment of the zoom lens system at an intermediate focal length when focused on an object at infinity.  FIGS. 22A ,  22 B,  22 C and  22 D show various aberrations that occurred in the lens arrangement shown in  FIG. 21 .  FIG. 23  shows a lens arrangement of the fourth numerical embodiment of the zoom lens system at the short focal length extremity when focused on an object at infinity.  FIGS. 24A ,  24 B,  24 C and  24 D show various aberrations that occurred in the lens arrangement shown in  FIG. 23 . Table 13 shows the lens surface data, Table 14 shows various zoom lens system data, Table 15 shows the aspherical surface data, and Table 16 shows the zoom lens group data of the fourth numerical embodiment. 
         [0075]    The lens arrangement of the fourth numerical embodiment is the same as that of first numerical embodiment, except for the positive lens element  30  of the third lens group G 3  being a positive meniscus lens element having a convex surface on the image side. 
         [0000]    
       
         
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 13 
               
             
             
               
                   
               
               
                 LENS SURFACE DATA 
               
             
          
           
               
                   
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 νd 
               
               
                   
                   
               
             
          
           
               
                   
                  1 
                 −45.963 
                 0.700 
                 1.75500 
                 52.3 
               
               
                   
                  2 
                 7.911 
                 0.570 
               
               
                   
                  3* 
                 8.720 
                 1.498 
                 1.82115 
                 24.1 
               
               
                   
                  4* 
                 15.035 
                 d4  
               
               
                   
                  5(Diaphragm) 
                 ∞ 
                 0.350 
               
               
                   
                  6 
                 4.904 
                 1.700 
                 1.88300 
                 40.8 
               
               
                   
                  7 
                 −8.982 
                 0.500 
                 1.75211 
                 25.0 
               
               
                   
                  8 
                 8.982 
                 0.070 
               
               
                   
                  9* 
                 3.990 
                 0.800 
                 1.60641 
                 27.2 
               
               
                   
                 10* 
                 2.839 
                 d10 
               
               
                   
                 11* 
                 −101.466 
                 1.800 
                 1.54358 
                 55.7 
               
               
                   
                 12* 
                 −6.432 
                 d12 
               
               
                   
                 13 
                 ∞ 
                 0.350 
                 1.51680 
                 64.2 
               
               
                   
                 14 
                 ∞ 
                 0.510 
               
               
                   
                 15 
                 ∞ 
                 0.500 
                 1.51680 
                 64.2 
               
               
                   
                 16 
                 ∞ 
                 — 
               
               
                   
                   
               
               
                   
                 The asterisk (*) designates an aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
           
               
                 TABLE 14 
               
               
                   
               
               
                 ZOOM LENS SYSTEM DATA 
               
               
                 Zoom Ratio 3.86 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                   
                 Short Focal Length Extremity 
               
               
                   
                 Fno. 
                 3.3 
               
               
                   
                 f 
                 5.00 
               
               
                   
                 W 
                 43.3 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 28.50 
               
               
                   
                 d4 
                 12.663 
               
               
                   
                 d10 
                 2.350 
               
               
                   
                 d12 
                 3.369 
               
               
                   
                   
                 Intermediate Focal Length 
               
               
                   
                 Fno. 
                 4.8 
               
               
                   
                 f 
                 9.80 
               
               
                   
                 W 
                 21.2 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 26.89 
               
               
                   
                 d4 
                 5.579 
               
               
                   
                 d10 
                 8.650 
               
               
                   
                 d12 
                 2.540 
               
               
                   
                   
                 Long Focal Length Extremity 
               
               
                   
                 Fno. 
                 6.0 
               
               
                   
                 f 
                 19.30 
               
               
                   
                 W 
                 11.2 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 31.50 
               
               
                   
                 d4 
                 1.420 
               
               
                   
                 d10 
                 18.117 
               
               
                   
                 d12 
                 1.850 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE 15 
               
               
                   
               
               
                 ASPHERICAL SURFACE DATA (aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surf. No. 
                 κ 
                 A4 
                 A6 
                 A8 
               
               
                   
               
               
                  3 
                 0.000 
                 −0.2040 × 10 −3   
                 −0.4028 × 10 −5   
                 −0.2337 × 10 −6   
               
               
                  4 
                 0.000 
                 −0.3864 × 10 −3   
                 −0.6001 × 10 −5   
                 −0.1292 × 10 −6   
               
               
                  9 
                 0.000 
                 −0.3673 × 10 −2   
                   0.1043 × 10 −3   
                 −0.2081 × 10 −3   
               
               
                 10 
                 −0.548 
                   0.9826 × 10 −3   
                   0.4543 × 10 −3   
                 −0.3223 × 10 −3   
               
               
                 11 
                 0.000 
                   0.1041 × 10 −2   
                 −0.1117 × 10 −3   
                   0.8890 × 10 −5   
               
               
                 12 
                 0.000 
                   0.2521 × 10 −2   
                 −0.1645 × 10 −3   
                   0.1133 × 10 −4   
               
               
                   
               
             
          
           
               
                   
                 Surf. No. 
                 A10 
               
               
                   
                   
               
               
                   
                  9 
                   0.2296 × 10 −4   
               
               
                   
                 10 
                   0.4250 × 10 −4   
               
               
                   
                 11 
                 −0.2075 × 10 −6   
               
               
                   
                 12 
                 −0.2429 × 10 −6   
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 16 
               
             
             
               
                   
               
               
                 ZOOM LENS GROUP DATA 
               
             
          
           
               
                 Lens Group 
                 First Surface 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −14.15 
               
               
                 2 
                 6 
                 9.52 
               
               
                 3 
                 11 
                 12.55 
               
               
                   
               
             
          
         
       
     
       Embodiment 5  
       [0076]      FIGS. 25 through 30D  and Tables 17 through 20 show a fifth numerical embodiment of a zoom lens system according to the present invention.  FIG. 25  shows a lens arrangement of the fifth numerical embodiment of the zoom lens system at the long focal length extremity when focused on an object at infinity.  FIGS. 26A ,  26 B,  26 C and  26 D show various aberrations that occurred in the lens arrangement shown in  FIG. 25 .  FIG. 27  shows a lens arrangement of the fifth numerical embodiment of the zoom lens system at an intermediate focal length when focused on an object at infinity.  FIGS. 28A ,  28 B,  28 C and  28 D show various aberrations that occurred in the lens arrangement shown in  FIG. 27 .  FIG. 29  shows a lens arrangement of the fifth numerical embodiment of the zoom lens system at the short focal length extremity when focused on an object at infinity.  FIGS. 30A ,  30 B,  30 C and  30 D show various aberrations that occurred in the lens arrangement shown in  FIG. 29 . Table 17 shows the lens surface data, Table 18 shows various zoom lens system data, Table 19 shows the aspherical surface data, and Table 20 shows the zoom lens group data of the fifth numerical embodiment. 
         [0077]    The lens arrangement of the fifth numerical embodiment is the same as that of first numerical embodiment, except for the negative lens element  10  of the first lens group G 1  being a negative meniscus lens element having a convex surface on the object side. 
         [0000]    
       
         
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 17 
               
             
             
               
                   
               
               
                 LENS SURFACE DATA 
               
             
          
           
               
                   
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 νd 
               
               
                   
                   
               
             
          
           
               
                   
                  1 
                 176.511 
                 0.700 
                 1.75500 
                 52.3 
               
               
                   
                  2 
                 6.156 
                 0.913 
               
               
                   
                  3* 
                 6.632 
                 1.576 
                 1.82115 
                 24.1 
               
               
                   
                  4* 
                 9.686 
                 d4  
               
               
                   
                  5(Diaphragm) 
                 ∞ 
                 0.350 
               
               
                   
                  6 
                 4.985 
                 1.700 
                 1.88300 
                 40.8 
               
               
                   
                  7 
                 −8.567 
                 0.500 
                 1.75211 
                 25.0 
               
               
                   
                  8 
                 8.567 
                 0.070 
               
               
                   
                  9* 
                 4.425 
                 0.800 
                 1.60641 
                 27.2 
               
               
                   
                 10* 
                 3.280 
                 d10 
               
               
                   
                 11* 
                 83.400 
                 1.800 
                 1.54358 
                 55.7 
               
               
                   
                 12* 
                 −8.621 
                 d12 
               
               
                   
                 13 
                 ∞ 
                 0.350 
                 1.51680 
                 64.2 
               
               
                   
                 14 
                 ∞ 
                 0.510 
               
               
                   
                 15 
                 ∞ 
                 0.500 
                 1.51680 
                 64.2 
               
               
                   
                 16 
                 ∞ 
                 — 
               
               
                   
                   
               
               
                   
                 The asterisk (*) designates an aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
           
               
                 TABLE 18 
               
               
                   
               
               
                 ZOOM LENS SYSTEM DATA 
               
               
                 Zoom Ratio 3.86 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                   
                 Short Focal Length Extremity 
               
               
                   
                 Fno. 
                 3.3 
               
               
                   
                 f 
                 5.00 
               
               
                   
                 W 
                 43.4 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 29.41 
               
               
                   
                 d4 
                 12.948 
               
               
                   
                 d10 
                 2.323 
               
               
                   
                 d12 
                 3.601 
               
               
                   
                   
                 Intermediate Focal Length 
               
               
                   
                 Fno. 
                 4.8 
               
               
                   
                 f 
                 9.80 
               
               
                   
                 W 
                 21.8 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 27.69 
               
               
                   
                 d4 
                 5.691 
               
               
                   
                 d10 
                 8.665 
               
               
                   
                 d12 
                 2.799 
               
               
                   
                   
                 Long Focal Length Extremity 
               
               
                   
                 Fno. 
                 6.0 
               
               
                   
                 f 
                 19.30 
               
               
                   
                 W 
                 11.4 
               
               
                   
                 Y 
                 3.88 
               
               
                   
                 fB 
                 0.59 
               
               
                   
                 L 
                 32.60 
               
               
                   
                 d4 
                 1.675 
               
               
                   
                 d10 
                 18.538 
               
               
                   
                 d12 
                 1.850 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE 19 
               
               
                   
               
               
                 ASPHERICAL SURFACE DATA (aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surf. No. 
                 κ 
                 A4 
                 A6 
                 A8 
               
               
                   
               
               
                  3 
                 0.000 
                 −0.2554 × 10 −3   
                 −0.7500 × 10 −5   
                 −0.2070 × 10 −6   
               
               
                  4 
                 0.000 
                 −0.4088 × 10 −3   
                 −0.1083 × 10 −4   
                 −0.4987 × 10 −7   
               
               
                  9 
                 0.000 
                 −0.1166 × 10 −2   
                 −0.9432 × 10 −4   
                 −0.1066 × 10 −3   
               
               
                 10 
                 −0.289 
                   0.2919 × 10 −2   
                   0.2129 × 10 −3   
                 −0.1739 × 10 −3   
               
               
                 11 
                 0.000 
                   0.9789 × 10 −3   
                 −0.9349 × 10 −4   
                   0.6129 × 10 −5   
               
               
                 12 
                 0.000 
                   0.1798 × 10 −2   
                 −0.1291 × 10 −3   
                   0.7412 × 10 −5   
               
               
                   
               
             
          
           
               
                   
                 Surf. No. 
                 A10 
               
               
                   
                   
               
               
                   
                  9 
                   0.9646 × 10 −5   
               
               
                   
                 10 
                   0.1663 × 10 −4   
               
               
                   
                 11 
                 −0.1515 × 10 −6   
               
               
                   
                 12 
                 −0.1678 × 10 −6   
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 20 
               
             
             
               
                   
               
               
                 ZOOM LENS GROUP DATA 
               
             
          
           
               
                 Lens Group 
                 First Surface 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −13.59 
               
               
                 2 
                 6 
                 9.55 
               
               
                 3 
                 11 
                 14.47 
               
               
                   
               
             
          
         
       
     
         [0078]    The numerical values of each condition for each embodiment are shown in Table 21. 
         [0000]    
       
         
               
               
               
               
               
             
               
               
               
               
             
           
               
                   
                 TABLE 21 
               
               
                   
                   
               
             
             
               
                   
                   
                 Embod. 1 
                 Embod. 2 
                 Embod. 3 
               
               
                   
                   
               
               
                   
                 Condition (1) 
                 2.961 
                 2.961 
                 2.961 
               
               
                   
                 Condition (2) 
                 0.900 
                 0.902 
                 0.938 
               
               
                   
                 Condition (3) 
                 3.005 
                 2.996 
                 3.186 
               
               
                   
                   
               
             
          
           
               
                   
                   
                 Embod. 4 
                 Embod. 5 
               
               
                   
                   
               
               
                   
                 Condition (1) 
                 2.913 
                 2.920 
               
               
                   
                 Condition (2) 
                 0.964 
                 0.916 
               
               
                   
                 Condition (3) 
                 3.353 
                 2.911 
               
               
                   
                   
               
             
          
         
       
     
         [0079]    As can be understood from Table 21, the first through fifth numerical embodiments satisfy conditions (1) through (3). Furthermore, as can be understood from the aberration diagrams, the various aberrations are suitably corrected. 
         [0080]    Obvious changes may be made in the specific embodiments of the present invention described herein, such modifications being within the spirit and scope of the invention claimed. It is indicated that all matter contained herein is illustrative and does not limit the scope of the present invention.