Wide angle zoom lens system

Claim 2

A wide angle zoom lens system which comprises a diverging lens group and a converging lens group in order from the object side and in which both of said groups are movable on the optical axis of the lens system to vary the air space between said two groups so that the magnification of the image is variable while the image plane is being maintained at a fixed position. said diverging lens group comprises, in order from the object side, a first member which is a negative meniscus lens component convex to the object side, a second member which is a positive lens component, a third member which is a negative lens component, a fourth member which is a positive meniscus lens component convex to the object side, said four lens components being separate from one another, and an air chamber having a converging effect between said second and said third members, said third and said fourth members being so disposed that the air space therebetween is greater than the center thickness of said third member. said converging lens group comprising at least four positive lens components and a negative lens component, the foremost and the rearmost lens components of said converging lens group being positive lens components.

Claim 3

A wide angle zoom lens system according to claim 1, wherein the shape of said negative lens component forming said third member and the air space between said third member and said positive meniscus lens component forming said fourth member satisfy the following conditions: 0.5<(R.sub.5 +R.sub.6)/(R.sub.5 -R.sub.6)<1.2 and 0.1≦D/|f.sub.1 |≦0.4, where R 5 and R 6 respectively represent the curvature radii of the surfaces of said third member facing the object side and the image side, respectively, and f 1 represents the total focal length of said diverging lens group.

Claim 4

A wide angle zoom lens system according to claim 2, wherein the respective lens components in said diverging lens group satisfy the following conditions: 1.2<|f.sub.11 |/|f.sub.1 |<3.8, 1.8<f.sub.12 /|f.sub.1 |<4.0, 0.4<|f.sub.13 |/|f.sub.1 |<1.2 and 1.2<f.sub.14 /|f.sub.1 |<3.8, where f 1 represents the total focal length of said diverging lens group, f 1i the focal length of each individual lens component in said diverging group, and the suffix i the order from the object side.

Claim 5

A wide angle zoom lens system according to claim 3, wherein the respective lens components in said diverging lens group further satisfy the following conditions: 1.3<Q.sub.11 <8.2, 0.5<Q.sub.12 <1.5 and -5.1<Q.sub.14 <-1.5, where Q 1i represents the shape factor of each lens component in said diverging lens group, and the shape factor is defined as (r F +r R )/(r F -r R ), where r F and r R represent the curvature radii of the foremost and the rearmost surface of each lens component.

Claim 6

A wide angle zoom lens system according to claim 4, wherein the lens components of said converging lens group, in order from the object side, are a positive lens, a positive lens, a positive meniscus lens convex to the object side, a negative lens, and a positive lens.

Claim 7

A wide angle zoom lens system according to claim 5, wherein the respective lens components in said converging lens group satisfy the following conditions: 2.8<f.sub.21 /f.sub.2 <4.5, 1.0<f.sub.22 /f.sub.2 <1.8, 1.1<f.sub.23 /f.sub.2 <2.0, 0.4<|f.sub.24 |/f.sub.2 <0.6 and 0.9<f.sub.25 /f.sub.2 <1.1, where f 2 represents the total focal length of said converging lens group, f 2i the focal length of each lens component in said converging lens group, and the suffix i the order from the object side.

Claim 8

A wide angle zoom lens system according to claim 6, wherein the respective lens components in said converging lens group further satisfy the following conditions: -0.9<Q.sub.21 <-0.1, -1.0<Q.sub.22 <-0.7, -3.4<Q.sub.23 <-1.5, 0.8<Q.sub.24 <1.4 and -0.2<Q.sub.25 <0.4, where Q 2i represents the shape factor of each lens component in said diverging lens group and the suffix i represents the order from the object side, the shape factor being defined as (r F +r R )/r F -r R ), where r F and r R represents the curvature radii of the foremost and the rearmost surface, respectively, of each lens component.

Claim 9

A wide angle zoom lens system according to claim 7, wherein, in said diverging lens group, the divergent components, namely, said negative lens component forming said first member and said negative lens component forming said third member have Abbe numbers greater than those of the convergent components, namely, said positive lens component forming said second member and said positive meniscus lens component forming said fourth member.

Claim 10

A wide angle zoom lens system according to claim 7, having the following numerical data: Total focal length: 36.023 - 49.497 - 68.795 F-number: 3.5 Maximum angle of view: 62° Back focal distance: 43.776 - 53.991 - 68.622 __________________________________________________________________________ r.sub.1 =50.379 d.sub.1 =1.3 n.sub.1 =1.74443 ν.sub.1 =49.4 r.sub.2 =27.469 d.sub.2 =6.3 f.sub.1 = r.sub.3 =670.373 d.sub.3 =3.5 n.sub.2 =1.5168 ν.sub.2 =64.2 -53.0 r.sub.4 =-114.009 d.sub.4 =0.1 r.sub.5 =∞ d.sub.5 =1.8 n.sub.3 =1.713 ν.sub.3 =53.9 r.sub.6 =32.531 d.sub.6 =8.4 r.sub.7 =35.195 d.sub.7 =3.4 n.sub.4 =1.76182 ν.sub.4 =26.5 r.sub.8 =57.719 d.sub.8 =29.009- 12.916- 0.846 r.sub.9 =101.102 d.sub.9 =3.0 n.sub.5 =1.5168 ν.sub.5 =64.2 r.sub.10 =-763.611 d.sub.10 =0.1 r.sub.11 =28.387 d.sub.11 =6.4 n.sub.6 =1.52 ν.sub.6 =70.1 f.sub.2 = r.sub.12 =-449.780 d.sub.12 =0.1 40.182 r.sub.13 = 19.335 d.sub.13 = 5.9 n.sub.7 = 1.52 ν.sub.7 = 70.1 r.sub.14 = 37.463 d.sub.14 = 4.0 r.sub.15 =-564.061 d.sub.15 =1.4 n.sub.8 =1.80518 ν.sub.8 =25.5 r.sub.16 =16.279 d.sub.16 =3.85 r.sub.17 =44.719 d.sub.17 =4.1 n.sub.9 =1.6727 ν.sub.9 =32.2 r.sub.18 =-56.902 __________________________________________________________________________ where r 1 , r 2 , r 3 , . . . represent the curvature radii of the refracting surfaces of the lenses, d 1 , d 2 , d 3 , . . . represent the center thickness of the lenses and the air spaces therebetween, and n 1 , n 2 , n 3 , . . . and ν 1 , ν 2 , ν 3 , . . . represent the refractive indices and Abbe numbers of the lenses.

Claim 11

A wide angle zoom lens system according to claim 7, having the following numerical data: Total focal length: 36.023-49.497-68.796 F-number: 3.5 Maximum angle of view: 62° Back focal distance: 43.491-52.793-66.114 __________________________________________________________________________ r.sub.1 =52.287 d.sub.1 =1.5 n.sub.1 =1.72342 ν.sub.1 =38.0 r.sub.2 =35.517 d.sub.2 =4.9 f.sub.1 = r.sub.3 =∞ d.sub.3 =4.0 n.sub.2 =1.5168 ν.sub.2 =64.2 -59.942 r.sub.4 =-98.799 d.sub.4 =0.1 r.sub.5 =-879.752 d.sub.5 =2.0 n.sub.3 =1.72 ν.sub.3 =50.3 r.sub.6 =27.242 d.sub.6 =8.5 r.sub.7 =34.469 d.sub.7 =3.9 n.sub.4 =1.76182 ν.sub.4 =26.5 r.sub.8 =61.405 d.sub.8 =33.625-14.882-0.825 r.sub.9 =117.209 d.sub.9 =3.5 n.sub.5 =1.62299 ν.sub.5 =58.1 r.sub.10 =-98.386 d.sub.10 =1.0 n.sub.6 =1.80518 ν.sub.6 =25.5 r.sub.11 =-323.279 d.sub.11 =0.1 r.sub.12 =28.810 d.sub.12 =5.75 n.sub.7 =1.51118 ν.sub.7 = 50.9 f.sub.2 = r.sub.13 =516.415 d.sub.13 =0.1 41.379 r.sub.14 =19.119 d.sub.14 =5.2 n.sub.8 =1.51118 ν.sub.8 =50.9 r.sub.15 =39.311 d.sub.15 =2.9 r.sub.16 =∞ d.sub.16 =2.5 n.sub.9 =1.80518 ν.sub.9 =25.5 r.sub.17 =16.622 d.sub.17 =4.0 r.sub.18 =50.614 d.sub.18 =3.8 n.sub.10 =1.61293 ν.sub.10 =36.9 r.sub.19 =-48.431 __________________________________________________________________________ where r 1 , r 2 , r 3 , . . . represent the curvature radii of the refracting surfaces of the lenses, d 1 , d 2 , d 3 , . . . represent the center thickness of the lenses and the air spaces therebetween, and n 1 , n 2 , n 3 , . . . and ν 1 , ν 2 , ν 3 , . . . represent the refractive indices and Abbe numbers of the lenses.

Claim 12

A wide angle zoom lens system according to claim 8, having the following numerical data:

Claim 13

Total focal length: 25.50-35.150-48.805

Claim 14

Total focal length: 25.50-35.150-48.805

Claim 15

F-number: 4

Claim 16

F-number: 4

Claim 17

Maximum angle of view: 80.6°

Claim 18

Maximum angle of view: 80.6°

Claim 19

Back focal distance: 40.102-48.838-61.200 __________________________________________________________________________ r.sub.1 =80.0 d.sub.1 =3.5 n.sub.1 =1.77279 ν.sub.1 =49.4 r.sub.2 =32.471 d.sub.2 =10.0 f.sub.1 = r.sub.3 =-1000.0 d.sub.3 =5.0 n.sub.2 =1.60342 ν.sub.2 =38.0 -45.379 r.sub.4 =-68.877 d.sub.4 =0.1 r.sub.5 =-429.670 d.sub.5 =3.3 n.sub.3 =1.80279 ν.sub.3 =46.8 r.sub.6 =30.696 d.sub.6 =12.9 r.sub.7 =42.617 d.sub.7 =3.6 n.sub.4 =1.71736 ν.sub.4 =29.5 r.sub.8 =93.788 d.sub.8 =38.834-18.764-3.925 r.sub.9 =109.554 d.sub.9 =4.2 n.sub.5 =1.53172 ν.sub.5 =48.9 r.sub.10 =-184.418 d.sub.10 =0.1 r.sub.11 =37.007 d.sub.11 =5.1 n.sub.6 =1.50137 ν.sub.6 =56.5 f.sub.2 = r.sub.12 =-459.818 d.sub.12 =0.1 41.082 r.sub.13 = 21.134 d.sub.13 =7.6 n.sub.7 =1.50137 ν.sub.7 =56.5 r.sub.14 = 73.546 d.sub.14 = 3.5 r.sub.15 = -154.35 d.sub.15 = 2.4 n.sub.8 = 1.79504 ν.sub. 8 = 28.4 r.sub.16 = 17.663 d.sub.16 = 3.54 r.sub.17 = 53.968 d.sub.17 = 3.8 n.sub.9 = 1.46450 ν.sub.9 = 65.8 r.sub.18 = -27.275 __________________________________________________________________________ where r 1 , r 2 , r 3 , . . . represent the curvature radii of the refracting surfaces of the lenses, d 1 , d 2 , d 3 , . . . represent the center thickness of the lenses and the air spaces therebetween, and n 1 , n 2 , n 3 , . . . ν 1 , ν 2 , ν 3 , . . . represent the refractive indices and Abbe number of the lenses.

Claim 20

Back focal distance: 40.102-48.838-61.200 __________________________________________________________________________ r.sub.1 =80.0 d.sub.1 =3.5 n.sub.1 =1.77279 ν.sub.1 =49.4 r.sub.2 =32.471 d.sub.2 =10.0 f.sub.1 = r.sub.3 =-1000.0 d.sub.3 =5.0 n.sub.2 =1.60342 ν.sub.2 =38.0 -45.379 r.sub.4 =-68.877 d.sub.4 =0.1 r.sub.5 =-429.670 d.sub.5 =3.3 n.sub.3 =1.80279 ν.sub.3 =46.8 r.sub.6 =30.696 d.sub.6 =12.9 r.sub.7 =42.617 d.sub.7 =3.6 n.sub.4 =1.71736 ν.sub.4 =29.5 r.sub.8 =93.788 d.sub.8 =38.834-18.764-3.925 r.sub.9 =109.554 d.sub.9 =4.2 n.sub.5 =1.53172 ν.sub.5 =48.9 r.sub.10 =-184.418 d.sub.10 =0.1 r.sub.11 =37.007 d.sub.11 =5.1 n.sub.6 =1.50137 ν.sub.6 =56.5 f.sub.2 = r.sub.12 =-459.818 d.sub.12 =0.1 41.082 r.sub.13 = 21.134 d.sub.13 =7.6 n.sub.7 =1.50137 ν.sub.7 =56.5 r.sub.14 = 73.546 d.sub.14 = 3.5 r.sub.15 = -154.35 d.sub.15 = 2.4 n.sub.8 = 1.79504 ν.sub. 8 = 28.4 r.sub.16 = 17.663 d.sub.16 = 3.54 r.sub.17 = 53.968 d.sub.17 = 3.8 n.sub.9 = 1.46450 ν.sub.9 = 65.8 r.sub.18 = -27.275 __________________________________________________________________________ where r 1 , r 2 , r 3 , . . . represent the curvature radii of the refracting surfaces of the lenses, d 1 , d 2 , d 3 , . . . represent the center thickness of the lenses and the air spaces therebetween, and n 1 , n 2 , n 3 , . . . ν 1 , ν 2 , ν 3 , . . . represent the refractive indices and Abbe number of the lenses.

Claim 21

A wide angle zoom lens system according to claim 4, wherein said converging lens group includes six components, namely, in order from the object side, a fifth member which is a positive lens component, a sixth member which is a positive lens component, a seventh member which is a positive meniscus lens component convex to the object side, an eighth member which is a negative lens component, a ninth member which is a positive lens component, and a tenth member which is a positive lens component.

Claim 22

A wide angle zoom lens system according to claim 12, wherein the respective lens components in said converging lens group satisfy the following conditions: 1.9<f.sub.21 /f.sub.2 <3.5, 1.1<f.sub.22 /f.sub.2 <1.9, 1.1<f.sub.23 /f.sub.2 <3.5, 0.4<|f.sub.24 |/f.sub.2 <0.6, 1.0<f.sub.25 /f.sub.2 <3.5 and 1.2<f.sub.26 /f.sub.2 <4.0, where f 2 represents the total focal length of said converging lens group, f 2i the focal length of each lens component in said converging lens group, and the suffix i the order from the object side.

Claim 23

A wide angle zoom lens system according to claim 13, wherein the respective lens components in said converging lens group satisfy the following conditions: -1.3<Q.sub.21 <-0.5, -1.5<Q.sub.22 <-0.9, -6.2<Q.sub.23 <-1.3, 0.4<Q.sub.24 <1.2, 0.4<Q.sub.25 <1.5 and -1.0<Q.sub.26 <1.3, where Q 2i represents the shape factor of each lens component in said diverging lens group and the suffix i represents the order from the object side, the shape factor being defined as (r F +r R ), where r F and r R represents the curvature radii of the foremost and rearmost surfaces of each lens components.

Claim 24

A wide angle zoom lens system according to claim 14, wherein, in said diverging lens group, the divergent components, namely, said negative meniscus lens component forming said first member and said negative lens component forming said third member have Abbe numbers greater than those of the convergent components, namely, said positive lens component forming said second member and said positive meniscus lens component forming said fourth member.

Claim 25

A wide angle zoom lens system according to claim 14, having the following numerical data: Total focal length: 25-35.355-47.625 F-number: 4 Maximum angle of view: 81.6° Back focal distance: 37.831-46.655-57.134 ______________________________________ r.sub.1 =160. d.sub.1 =3.2 n.sub.1 =1.713 ν.sub.1 =53.9 r.sub.2 =33.8 d.sub.2 =6.5 r.sub.3 =365.63 d.sub.3 =4.7 n.sub.2 =1.5168 ν.sub.2 =64.2 f.sub.1 = r.sub.4 =-62.5 d.sub.4 =0.1 r.sub.5 =430.791 d.sub.5 =2.0 n.sub.3 =1.74 ν.sub.3 =28.2 -40.0 r.sub.6 =-500. d.sub.6 =0.7 n.sub.4 =1.713 ν.sub.4 =53.9 r.sub.7 =23.05 d.sub.7 =10.5 r.sub.8 =30.503 d.sub.8 =2.8 n.sub.5 =1.80518 ν.sub.5 =25.5 r.sub.9 =46.128 d.sub.9 =26.364 -10.390- 0.439 r.sub.10 =49. d.sub.10 =1.9 n.sub.6 =1.52 ν.sub.6 =70.1 r.sub.11 =573.031 d.sub.11 =0.1 r.sub.12 =26.375 d.sub.12 =6.3 n.sub.7 =1.52 ν.sub.7 =70.1 r.sub.13 =220. d.sub.13 =0.1 r.sub.14 =18.845 d.sub.14 =3.5 n.sub.8 =1.52 ν.sub.8 =70.1 f.sub.2 = r.sub.15 =89.339 d.sub.15 =3.1 34.087 r.sub.16 =-94.098 d.sub.16 =1.43 n.sub.9 =1.71736 ν.sub.9 =29.5 r.sub.17 =15.751 d.sub.17 =2.1 r.sub.18 =-400. d.sub.18 =2.0 n.sub.10 =1.62041 ν.sub.10 =60.3 r.sub.19 =-52.854 d.sub.19 =0.1 r.sub.20 =-557.09 d.sub.20 =2.0 n.sub.11 =1.62374 ν.sub.11 =47.0 r.sub.21 =-35.592 ______________________________________ where r 1 , r 2 , r 3 , . . . represent the curvature radii of the refracting surfaces of the lenses, d 1 , d 2 , d 3 , . . . represent the center thickness of the lenses and the air spaces therebetween, and n 1 , n 2 , n 3 , . . . and ν 1 , ν 2 , ν 3 , . . . represent the refractive indices and Abbe numbers of the lenses.

Claim 26

A wide angle zoom lens system according to claim 14, having the following numerical data: Total focal length: 25.041-34.500-44.533 F-number: 4 Maximum angle of view: 81.6° Back focal distance: 38.002-46.370-55.244 ______________________________________ r.sub.1 =107. d.sub.1 =2.0 n.sub.1 =1.74443 ν.sub.1 =49.4 r.sub.2 =32.9 d.sub.2 =9.0 r.sub.3 =∞ d.sub.3 =5.1 n.sub.2 =1.5168 ν.sub.2 =64.2 f.sub.1 = r.sub.4 =-71.174 d.sub.4 =0.1 r.sub.5 =1000. d.sub.5 =2.2 n.sub.3 =1.80518 ν.sub.3 =25.5 -43.706 r.sub.6 -200. d.sub.6 =0.8 n.sub.4 =1.76684 ν.sub.4 =46.6 r.sub.7 =31. d.sub.7 =15.1 r.sub.8 =42.614 d.sub.8 =2.4 n.sub.5 =1.80518 ν.sub.5 =25.5 r.sub.9 =68.786 d.sub.9 =29.957 -11.454- 0.421 r.sub.10 =51.375 d.sub.10 =4.0 n.sub.6 =1.50137 ν.sub.6 =56.5 r.sub.11 =-158. d.sub.11 =1.5 n.sub.7 =1.74 ν.sub.7 =28.2 r.sub.12 =-200. d.sub.12 =0.1 r.sub. 13 =24.778 d.sub.13 =4.8 n.sub.8 =1.50137 ν.sub.8 =56.5 r.sub.14 =671.508 d.sub.14 =0.1 r.sub.15 =24.7 d.sub.15 =4.7 n.sub.9 =1.50137 ν.sub.9 =56.5 f.sub.2 = r.sub.16 =117.445 d.sub.16 =3.6 38.662 r.sub.17 =-67.089 d.sub.17 =2.3 n.sub.10 =1.80518 ν.sub.10 =25.5 r.sub.18 =18. d.sub.18 =2.4 r.sub.19 =-40.755 d.sub.19 =0.8 n.sub.11 =1.61025 ν.sub.11 =56.5 r.sub.20 =-500. d.sub.20 =2.7 n.sub.12 =1.50137 ν.sub.12 =56.5 r.sub.21 =-23. d.sub.21 =0.1 r.sub.22 =173.125 d.sub.22 =2.0 n.sub.13 =1.56732 ν.sub.13 =42.8 r.sub.23 =-43.441 ______________________________________ where r 1 , r 2 , r 3 , . . . represent the curvature radii of the refracting surfaces of the lenses, d 1 , d 2 , d 3 , . . . represent the center thickness of the lenses and the air spaces therebetween. and n 1 , n 2 , n 3 , . . . and ν 1 , ν 2 , ν 3 , . . . represent the refractive indices and Abbe numbers of the lenses.

Claim 27

A wide angle zoom lens system according to claim 14, having the following numerical data: Total focal length: 25.00-34.461-47.766 F-number: 4 Maximum angle of view: 81.6° Back focal distance: 38.828-47.392-59.437 ______________________________________ r.sub.1 =74.96 d.sub.1 =3.7 n.sub.1 =1.76684 ν.sub.1 =46.6 r.sub.2 =31.585 d.sub.2 =9.3 r.sub.3 =-1100.000 d.sub.3 =4.8 n.sub.2 =1.50137 ν.sub.2 =56.5 f.sub.1 = r.sub.4 =-67.23 d.sub.4 =0.1 r.sub.5 =-190.332 d.sub.5 = 2.1 n.sub.3 =1.80985 ν.sub.3 =22.9 -44.489 r.sub.6 =-89.000 d.sub.6 =1.0 n.sub.4 =1.76684 ν.sub.4 =46.6 r.sub.7 =36.661 d.sub.7 =18.5 r.sub.8 =56.600 d.sub.8 =3.5 n.sub.5 =1.74 ν.sub.5 =28.2 r.sub.9 =113.765 d.sub.9 =35.020- 15.341-0.861 r.sub.10 =56.000 10=3.5 n.sub.6 =1.53172 ν.sub.6 =48.9 r.sub.11 =-121.000 d.sub.11 =1.5 n.sub.7 =1.80518 ν.sub.7 =25.5 r.sub.12 =-275.395 d.sub.12 = 0.1 r.sub.13 =31.2 d.sub.13 =3.9 n.sub.8 =1.50137 ν.sub.8 =56.5 r.sub.14 =220.000 r.sub.15 =21.365 d.sub.15 =6.7 n.sub.9 =1.50137 ν.sub.9 =56.5 f.sub.2 = r.sub.16 =79.163 d.sub.16 =3.75 40.276 r.sub.17 =-554. d.sub.17 =2.4 n.sub.10 =1.80518 ν.sub.10 =25.5 r.sub.18 =16.7 d.sub.18 =1.9 r.sub.19 =350. d.sub.19 =1.1 n.sub.11 =1.6968 ν.sub.11 =55.6 r.sub.20 =87.133 d.sub.20 =2.5 n.sub.12 =1.50137 ν.sub.12 =56.5 r.sub.21 =-54.953 d.sub.21 =0.1 r.sub.22 =167.188 d.sub.22 =2.1 n.sub.13 =1.59551 ν.sub.13 =39.2 r.sub.23 =-62.039 ______________________________________ where r 1 , r 2 , r 3 , . . . represent the curvature radii of the refracting surfaces of the lenses, d 1 , d 2 , d 3 , . . . represent the center thickness of the lenses and the air spaces therebetween, and n 1 , n 2 , n 3 , . . . and ν 1 , ν 2 , ν 3 , . . . represent the refractive indices and Abbe numbers of the lenses.

Claim 28

A wide angle zoom lens system according to claim 15, having the following numerical data: Total focal length: 28.647-39.469-54.512 F-number: 3.5 Maximum angle of view: 74° Back focal distance: 40.724-49.439-61.556 __________________________________________________________________________ r.sub.1 =72.6 d.sub.1 =3.8 n.sub.1 =1.76684 ν.sub.1 =16.6 r.sub.2 =30.519 d.sub.2 =9.4 f.sub.1 = r.sub.3 =3000.0 d.sub.3 =5.2 n.sub.2 =1.56732 ν.sub.2 =12.8 R.sub.4 =-60.5 d.sub.4 =0.1 r.sub.5 =-118.686 d.sub.5 =4.3 n.sub.3 =1.76684 ν.sub.3 =46.6 r.sub.6 =31.5 d.sub.6 =6.4 r.sub.7 =38.34 d.sub.7 =3.5 n.sub.4 =1.71736 ν.sub.4 =29.5 r.sub.8 =137.056 d.sub.8 =36.742- 17.469-3.389 r.sub.9 =48.95 d.sub.9 =5.5 5=1.52 ν.sub.5 =70.1 r.sub.10 =2251.239 d.sub.10 =0.1 r.sub.11 =25.58 d.sub.11 =5.2 n.sub.6 =1.5168 ν.sub.6 =64.2 r.sub.12 =576.194 d.sub.12 =0.1 f.sub.2 = r.sub.13 =28.261 d.sub.13 =5.0 n.sub.7 =1.6172 ν.sub.7 =54.0 40.273 r.sub.14 =39.896 d.sub.14 =3.7 R.sub.15 =-71.6 d.sub.15 =2.1 8=1.74 ν.sub.8 =28.2 r.sub.16 =20.344 d.sub.16 =2.5 r.sub.17 =170.7 d.sub.17 =3.7 n.sub.9 =1.5725 ν.sub.9 =57.5 r.sub.18 =-32.0 d.sub.18 =0.1 r.sub.19 =97.717 d.sub.19 =2.3 n.sub.10 =1.62606 ν.sub.10 =39.1 r.sub.20 =-1452.182 __________________________________________________________________________ where r 1 , r 2 , r 3 , . . . represent the curvature radii of the refracting surfaces of the lenses, d 1 , d 2 , d 3 , . . . represent the center thickness of the lenses and the air spaces therebetween, and n 1 , n 2 , n 3 , . . . and ν 1 , ν 2 , ν 3 , . . . represent the refractive indices and Abbe numbers of the lenses.

Claim 29

A wide angle zoom lens system according to claim 15, having the following numerical data: Total focal length: 25.50-35.150-48.805 F-number: 4 Maximum angle of view: 80.6° Back focal distance: 39.612-48.348-60.709 __________________________________________________________________________ r.sub.1 =80.0 d.sub.1 =3.5 n.sub.1 =1.77279 ν.sub.1 =49.4 r.sub.2 =32.471 d.sub.2 =10.0 f.sub.1 = r.sub.3 =-630.0 d.sub.3 =5.0 n.sub.2 =1.60342 ν.sub.2 =38.0 r.sub.4 =-70.3 d.sub.4 =0.1 -45.37879 r.sub.5 =-217.401 d.sub.5 =3.3 n.sub.3 =1.80279 ν.sub.3 =46.8 r.sub.6 =38.907 d.sub.6 =18.9 r.sub.7 =57.924 d.sub.7 =3.6 n.sub.4 =1.80518 ν.sub.4 =25.5 r.sub.8 =106.702 d.sub.8 =35.412- 15.342- 0.503 r.sub.9 =56.8 d.sub.9 =2.9 n.sub.5 =1.53172 ν.sub.5 =48.9 r.sub.10 =-86.7 d.sub.10 =1.2 n.sub.6 =1.80518 ν.sub.6 =25.5 r.sub.11 =-219.5 d.sub.11 =0.1 r.sub.12 =31.648 d.sub.12 =4.0 n.sub.7 =1.50137 ν.sub.7 =56.5 f.sub.2 = r.sub.13 =201.0 d.sub.13 =0.1 r.sub.14 =21.636 d.sub.14 =6.8 n.sub.8 =1.50137 ν.sub.8 =56.5 41.082 r.sub.15 =72.7 d.sub.15 =3.8 r.sub.16 =-2100.0 d.sub.16 =2.4 n.sub.9 =1.79504 ν.sub.9 =28.4 r.sub.17 =16.739 d.sub.17 =1.9 r.sub.18 =185.0 d.sub.18 =3.8 n.sub.10 =1.4645 ν.sub.10 =65.8 r.sub.19 =-57.432 d.sub.19 =0.1 r.sub.20 =174.5 d.sub.20 =2.3 n.sub.11 =1.50137 ν.sub.11 =56.5 r.sub.21 =-58.829 __________________________________________________________________________ where r.sub.1, r.sub.2, r.sub.3, . . . represent the curvature radii of the refracting surfaces of the lenses, d.sub.1, d.sub.2, d.sub.3, . . . represent the center thickness of the lenses and the air spaces therebetween, and n.sub.1, n.sub.2, n.sub.3, . . . and ν.sub.1, ν.sub.2, ν.sub.3, . . . represent the refractive indices and Abbe numbers of the lenses.

Claim 30

A wide angle zoom lens system according to claim 4, wherein the lens components of said converging lens group, in order from the object side, are a positive lens, a positive meniscus lens convex to the object side, a negative lens, a positive lens, and a positive lens component.

Claim 31

A wide angle zoom lens system according to claim 21, having the following numerical data: Total focal length: 36.023-49.497-68.795 F-number: 3.5 Maximum angle of view: 62° Back focal distance: 43.570-52.871-66.193 __________________________________________________________________________ r.sub.1 =42.02 d.sub.1 =1.5 n.sub.1 =1.7495 ν.sub.1 =35.0 r.sub.2 = 32.714 d.sub.2 =6.2 r.sub.3 =516.061 d.sub.3 =4.0 n.sub.2 =1.5168 ν.sub.2 =64.2 f.sub.1 = r.sub.4 =-104.844 d.sub.4 =0.1 -59.952 r.sub.5 =-691.504 d.sub.5 =2.0 n.sub.3 =1.72 ν.sub.3 =50.3 r.sub.6 =26.197 d.sub.6 =9.2 r.sub.7 =32.915 d.sub.7 =3.9 n.sub.4 =1.76182 ν.sub.4 =26.5 r.sub.8 =52.686 d.sub.8 =33.217- 14.474- 0.420 r.sub.9 =39.486 d.sub.9 =8.0 n.sub.5 =1.62041 ν.sub.5 =60.3 r.sub.10 =-175.144 d.sub.10 =2.5 r.sub.11 =20.425 d.sub.11 =5.6 n.sub.6 =1.62041 ν.sub.6 =60.3 r.sub.12 =55.862 d.sub.12 =3.1 f.sub.2 = r.sub.13 =-137.5 d.sub.13 =2.5 n.sub. 7 =1.80518 ν.sub.7 =25.5 41.379 r.sub.14 =19.771 d.sub.14 =2.85 r.sub.15 =-263.447 d.sub.15 =3.45 n.sub.8 =1.62588 ν.sub.8 =35.6 r.sub.16 =-30.679 d.sub.16 =0.1 r.sub.17 =37.263 d.sub.17 =2.55 n.sub.9 =1.62588 ν.sub.9 =35.6 r.sub.18 =60.913 __________________________________________________________________________ where r 1 , r 2 , r 3 , . . . represent the curvature radii of the refracting surfaces of the lenses, d 1 , d 2 , d 3 , . . . represent the center thickness of the lenses and the air spaces therebetween, and n 1 , n 2 , n 3 , . . . and ν 1 , ν 2 , ν 3 , . . . represent the refractive indices and Abbe numbers of the lenses.