US4196969A — Zoom lens having a small distortion aberration

Claim 1

Independent Claim 768 words

A zoom lens system exhibiting a small distortion aberration, said zoom lens system comprising in order from the object side a first lens group having a negative focal length, a second lens group having a positive focal length, and a third lens group having a negative focal length, said first, second and third groups being relatively axially displaceable to maintain the image plane at a constant position, characterized by: (a) the resultant focal length of said first and second lens groups is always positive; (b) the third group of lens comprising, in order from the object side, a positive lens having a strong convex surface on the image side, a negative double concave lens, and a positive lens having a strong convex surface on the object side; and (c) the lens system satisfying the following conditions: (1) 0.55<f W12 /f W <0.90 (2) 1.30<|f 3 |/f W <3.00 (3) 0.0<(l W2 -l T2 )/(l W1 -l T1 )<0.33, and (4) -0.50<ΣP 3 <0.0 wherein: f W is the overall focal length at the wide angle position; f W12 is the resultant focal length of the first and second lens groups at the wide angle position; f 3 is the focal length of the third lens group; l W1 is the aerial space between the first and second lens groups at the wide angle position; l W2 is the aerial space between the second and third lens groups at the wide angle position; l T1 is the aerial space between the first and second lens groups at the narrow or telescopic angle position; l T2 is the aerial space between the second and third lens groups at the narrow or telescopic angle position; and ΣP 3 is the Petzval sum of the third lens group when the overall focal length is estimated as 1.0 at the wide angle position, and said zoom lens systems composed of twelve lenses grouped in three lens groups, in order from the object side to the image side, the first lens group having three lenses, with the first and second lenses L 1 , L 2 being negative lenses, and third lens L 3 being a positive lens, the second lens group having six lenses, with the fourth, fifth and sixth lenses L 4 , L 5 , L 6 all being positive lenses, with the seventh lens L 7 being negative, and with the eighth and ninth lenses L 8 , L 9 both being positive, an aperture A disposed between lenses L 7 and L 8 , the third lens group having three lenses, with the tenth lens L 10 being a positive lens, with the eleventh lens L 11 being a negative double concave lens, and with the twelfth lens L 12 being a positive lens, a fixed diaphragm B disposed adjacent the image side of the twelfth lens L 12 , wherein the radii of curvature r 1 to r 24 , the spacing or thickness d 1 to d 23 , the refractive indices n 1 to n 12 and Abbe numbers ν 1 to ν 12 of the lenses are as follows: ______________________________________ 1 : 4.50 overall focal length f = 100 - 195 half of the viewing angle ω = 24.02 - 12.67 ______________________________________ spacing radius and refractive of thick- index lens curvature ness at d-line Abbe No. ______________________________________ r.sub.1 =131.718 d.sub.1 = n.sub.1 =1.83400 ν.sub.1 =37.2 L.sub.1 4.27 r.sub.2 52.309 d.sub.2 = 15.63 first r.sub.3 =352.328 lens d.sub.3 = n.sub.2 =1.62041 ν.sub.2 =60.3 group L.sub.2 3.05 r.sub.4 =325.646 d.sub.4 = 4.65 r.sub.5 =83.002 d.sub.5 = n.sub.3 =1.80518 ν.sub.3 =25.4 L.sub.3 7.56 r.sub.6 =195.786 d.sub.6 = 60.18 r.sub.7 =105.305 d.sub.7 = n.sub.4 =1.67000 ν.sub.4 =57.4 L.sub.4 6.10 r.sub.8 1716.251 d.sub.8 = 0.12 r.sub.9 =62.784 d.sub.9 = n.sub.5 =1.72916 ν.sub.5 =54.7 L.sub.5 6.10 r.sub.10 =121.197 d.sub.10 = 0.12 r.sub.11 =44.664 d.sub.11 = n.sub.6 =1.51633 ν.sub.6 =64.1 L.sub.6 5.73 second r.sub.12 =67.222 lens d.sub.12 = group 9.67 r.sub.13 =227.221 d.sub.13 = n.sub.7 =1.80518 ν.sub.7 =25.4 L.sub.7 3.32 r.sub.14 =38.928 9.51 r.sub.15 =186.662 d.sub.15 = n.sub.8 =1.51821 ν.sub.8 =65.0 L.sub.8 5.18 r.sub.16 -135.927 d.sub.16 = 0.12 r.sub.17 =74.796 d.sub.17 = n.sub.9 =1.51633 ν.sub.9 =64.1 L.sub.9 4.76 r.sub.18 =415.941 d.sub.18 = 13.01 r.sub.19 =1144.956 d.sub.19 = n.sub.10 =1.60342 ν.sub.10 =38.0 L.sub.10 4.63 r.sub.20 =-73.422 d.sub.20 = 2.45 third r.sub.21 =-82.044 lens d.sub.21 = n.sub.11 =1.62041 ν.sub.11 =60.3 group L.sub.11 2.68 r.sub.22 =37.131 d.sub.22 = 1.62 r.sub.23 =41.818 d.sub.23 = n.sub.12 =1.67000 ν.sub.12 =57.4 L.sub.12 4.70 r.sub.24 =150.531 ______________________________________ overall focal length 100 150 195 ______________________________________ d.sub.6 60.18 20.28 0.99 d.sub.18 13.01 6.13 2.80 ______________________________________ ##STR7## ##STR8## ##STR9## ΣP.sub.3 = -0.325 ______________________________________

Claim 2

Dependent Claim 768 words

A zoom lens system exhibiting a small distortion aberration, said zoom lens system comprising in order from the object side a first lens group having a negative focal length, a second lens group having a positive focal length, and a third lens group having a negative focal length, said first, second and third groups being relatively axially displaceable to maintain the image plane at a constant position, characterized by: (a) the resultant focal length of said first and second lens groups is always positive; (b) the third group of lens comprising, in order from the object side, a positive lens having a strong convex surface on the image side, a negative double concave lens, and a positive lens having a strong convex surface on the object side; and (c) the lens system satisfying the following conditions: (1) 0.55<f W12 /f W <0.90 (2) 1.30<|f 3 |/f W <3.00 (3) 0.0<(l W2 -l T2 )/(l W1 -l T1 )<0.33, and (4) -0.50<ΣP 3 <0.0 wherein: f W is the overall focal length at the wide angle position; f W12 is the resultant focal length of the first and second lens groups at the wide angle position; f 3 is the focal length of the third lens group; l W1 is the aerial space between the first and second lens groups at the wide angle position; l W2 is the aerial space between the second and third lens groups at the wide angle position; l T1 is the aerial space between the first and second lens groups at the narrow or telescopic angle position; l T2 is the aerial space between the second and third lens groups at the narrow or telescopic angle position; and ΣP 3 is the Petzval sum of the third lens group when the overall focal length is estimated as 1.0 at the wide angle position, and said zoom lens systems composed of twelve lenses grouped in three lens groups, in order from the object side to the image side, the first lens group having three lenses, with the first and second lenses L 1 , L 2 being negative lenses, and third lens L 3 being a positive lens, the second lens group having six lenses, with the fourth, fifth and sixth lenses L 4 , L 5 , L 6 all being positive lenses, with the seventh lens L 7 being negative, and with the eighth and ninth lenses L 8 , L 9 both being positive, an aperture A disposed between lenses L 7 and L 8 , the third lens group having three lenses, with the tenth lens L 10 being a positive lens, with the eleventh lens L 11 being a negative double concave lens, and with the twelfth lens L 12 being a positive lens, a fixed diaphragm B disposed adjacent the image side of the twelfth lens L 12 , wherein the radii of curvature r 1 to r 24 , the spacing or thickness d 1 to d 23 , the refractive indices n 1 to n 12 and Abbe numbers ν 1 to ν 12 of the lenses are as follows: ______________________________________ 1 : 4.50 overall focal length f = 100 - 195 half of the viewing angle ω = 24.02 - 12.67 ______________________________________ spacing radius and refractive of thick- index lens curvature ness at d-line Abbe No. ______________________________________ r.sub.1 =131.718 d.sub.1 = n.sub.1 =1.83400 ν.sub.1 =37.2 L.sub.1 4.27 r.sub.2 52.309 d.sub.2 = 15.63 first r.sub.3 =352.328 lens d.sub.3 = n.sub.2 =1.62041 ν.sub.2 =60.3 group L.sub.2 3.05 r.sub.4 =325.646 d.sub.4 = 4.65 r.sub.5 =83.002 d.sub.5 = n.sub.3 =1.80518 ν.sub.3 =25.4 L.sub.3 7.56 r.sub.6 =195.786 d.sub.6 = 60.18 r.sub.7 =105.305 d.sub.7 = n.sub.4 =1.67000 ν.sub.4 =57.4 L.sub.4 6.10 r.sub.8 1716.251 d.sub.8 = 0.12 r.sub.9 =62.784 d.sub.9 = n.sub.5 =1.72916 ν.sub.5 =54.7 L.sub.5 6.10 r.sub.10 =121.197 d.sub.10 = 0.12 r.sub.11 =44.664 d.sub.11 = n.sub.6 =1.51633 ν.sub.6 =64.1 L.sub.6 5.73 second r.sub.12 =67.222 lens d.sub.12 = group 9.67 r.sub.13 =227.221 d.sub.13 = n.sub.7 =1.80518 ν.sub.7 =25.4 L.sub.7 3.32 r.sub.14 =38.928 9.51 r.sub.15 =186.662 d.sub.15 = n.sub.8 =1.51821 ν.sub.8 =65.0 L.sub.8 5.18 r.sub.16 -135.927 d.sub.16 = 0.12 r.sub.17 =74.796 d.sub.17 = n.sub.9 =1.51633 ν.sub.9 =64.1 L.sub.9 4.76 r.sub.18 =415.941 d.sub.18 = 13.01 r.sub.19 =1144.956 d.sub.19 = n.sub.10 =1.60342 ν.sub.10 =38.0 L.sub.10 4.63 r.sub.20 =-73.422 d.sub.20 = 2.45 third r.sub.21 =-82.044 lens d.sub.21 = n.sub.11 =1.62041 ν.sub.11 =60.3 group L.sub.11 2.68 r.sub.22 =37.131 d.sub.22 = 1.62 r.sub.23 =41.818 d.sub.23 = n.sub.12 =1.67000 ν.sub.12 =57.4 L.sub.12 4.70 r.sub.24 =150.531 ______________________________________ overall focal length 100 150 195 ______________________________________ d.sub.6 60.18 20.28 0.99 d.sub.18 13.01 6.13 2.80 ______________________________________ ##STR7## ##STR8## ##STR9## ΣP.sub.3 = -0.325 ______________________________________

Claim 3

Dependent Claim 817 words

A zoom lens system exhibiting a small distortion aberration, said zoom lens system comprising in order from the object side a first lens group having a negative focal length, a second lens group having a positive focal length, and a third lens group having a negative focal length, said first, second and third groups being relatively axially displaceable to maintain the image plane at a constant position, characterized by: (a) the resultant focal length of said first and second lens groups is always positive; (b) the third group of lens comprising, in order from the object side, a positive lens having a strong convex surface on the image side, a negative double concave lens, and a positive lens having a strong convex surface on the object side; and (c) the lens system satisfying the following conditions: (1) 0.55<f W12 /f W <0.90 (2) 1.30<|f 3 |/f W <3.00 (3) 0.0<(l W2 -l T2 )/(l W1 -l T1 )<0.33, and (4) -0.50<ΣP 3 <0.0 wherein: f W is the overall focal length at the wide angle position f W12 is the resultant focal length of the first and second lens groups at the wide angle position; f 3 is the focal length of the third lens group; l W1 is the aerial space between the first and second lens groups at the wide angle position; l W2 is the aerial space between the second and third lens groups at the wide angle position; l T1 is the aerial space between the first and second lens groups at the narrow or telescopic angle position; l T2 is the aerial space between the second and third lens groups at the narrow or telescopic angle position; and ΣP 3 is the Petzval sum of the third lens group when the overall focal length is estimated as 1.0 at the wide angle position, and said zoom lens systems composed of twelve lenses grouped in three lens groups, in order from the object side to the image side, the first lens group having three lenses, with the first and second lenses L 1 , L 2 being negative lenses, and third lens L 3 being a positive lens, the second lens group having six lenses, with the fourth, fifth and sixth lenses L 4 , L 5 , L 6 all being positive lenses, with the seventh lens L 7 being negative, and with the eighth and ninth lenses L 8 , L 9 both being positive, an aperture A disposed between lenses L 7 and L 8 , the third lens group having three lenses, with the tenth lens L 10 being a positive lens, with the eleventh lens L 11 being a negative double concave lens, and with the twelfth lens L 12 being a positive lens, a fixed diaphragm B disposed adjacent the image side of the twelfth lens L 12 , wherein the radii of curvature r 1 to r 24 , the spacing or thickness d 1 to d 23 , the refractive indices n 1 to n 12 and Abbe numbers ν 1 to ν 12 of the lenses are as follows: __________________________________________________________________________ 1 : 5.60 overall focal length f = 100 - 195 half of the viewing angle ω = 24.06 - 12.64 __________________________________________________________________________ radius of spacing and refractive index lens curvature thickness at d-line Abbe No. __________________________________________________________________________ r.sub.1 = 224.091 L.sub.1 d.sub.1 = 3.61 n.sub.1 = 1.83400 ν.sub.1 = 37.2 r.sub.2 = 52.831 d.sub.2 = 11.96 first r.sub.3 = -631.977 lens L.sub.2 d.sub.3 = 2.93 n.sub.2 = 1.72916 ν.sub.2 = 54.7 group r.sub.2 = 630.769 d.sub.4 = 3.05 r.sub.5 = 77.073 L.sub.3 d.sub.5 = 6.44 n.sub.5 = 1.80518 ν.sub.1 = 25.4 r.sub.6 = 208.593 d.sub.6 = 60.41 r.sub.7 = 85.176 L.sub.4 d.sub.7 = 6015 n.sub.4 = 1.64000 ν.sub.4 = 60.1 r.sub.8 = 528.837 d.sub.8 = 0.12 r.sub.9 = 59.403 L.sub.5 d.sub.9 = 5.46 n.sub.5 = 1.69680 ν.sub.5 = 55.5 r.sub.10 = 120.931 d.sub.10 = 0.12 r.sub.11 = 42.802 second L.sub.6 d.sub.11 = 5.07 n.sub.6 = 1.51633 ν.sub.6 = 64.1 lens r.sub.12 = 65.623 group d.sub.12 = 10.07 r.sub.13 = 192.384 L.sub.7 d.sub.13 = 2.44 n.sub.7 = 1.8.518 ν.sub.7 = 25.4 r.sub.14 = 35.021 d.sub.14 = 7.51 r.sub.15 = 247.823 L.sub.8 d.sub.15 = 3.90 n.sub.8 = 1.51821 ν.sub.8 = 65.0 r.sub.16 = -126.779 d.sub.16 = 0.12 r.sub.16 = 64.027 L.sub.9 d.sub.17 = 3.90 n.sub.9 = 1.51821 ν.sub.9 = 65.0 r.sub.18 = 377.138 d.sub.18 = 11.73 r.sub.19 = 2820.048 L.sub.10 d.sub.19 = 3.71 n.sub.10 = 1.59270 ν.sub.10 = 35.3 r.sub.20 = -71.466 d.sub.20 = 2.43 third r.sub.21 = -82.822 lens L.sub.11 d.sub.21 = 1.95 n.sub.11 = 1.64000 ν.sub.11 = 60.1 group r.sub.22 = 35.594 d.sub.22 = 1.17 r.sub.23 = 39.030 L.sub.12 d.sub.23 = 3.71 n.sub.12 = 1.72916 ν.sub.12 = 54.7 r.sub.24 = 105.609 __________________________________________________________________________ overall focal length 100 150 195 __________________________________________________________________________ d.sub.6 60.41 20.30 1.02 d.sub.18 11.73 6.30 3.70 __________________________________________________________________________ ##STR10## ##STR11## ##STR12## ΣP.sub.3 = -0.353 __________________________________________________________________________

Claim 4

Dependent Claim 817 words

A zoom lens system exhibiting a small distortion aberration, said zoom lens system comprising in order from the object side a first lens group having a negative focal length, a second lens group having a positive focal length, and a third lens group having a negative focal length, said first, second and third groups being relatively axially displaceable to maintain the image plane at a constant position, characterized by: (a) the resultant focal length of said first and second lens groups is always positive; (b) the third group of lens comprising, in order from the object side, a positive lens having a strong convex surface on the image side, a negative double concave lens, and a positive lens having a strong convex surface on the object side; and (c) the lens system satisfying the following conditions: (1) 0.55<f W12 /f W <0.90 (2) 1.30<|f 3 |/f W <3.00 (3) 0.0<(l W2 -l T2 )/(l W1 -l T1 )<0.33, and (4) -0.50<ΣP 3 <0.0 wherein: f W is the overall focal length at the wide angle position f W12 is the resultant focal length of the first and second lens groups at the wide angle position; f 3 is the focal length of the third lens group; l W1 is the aerial space between the first and second lens groups at the wide angle position; l W2 is the aerial space between the second and third lens groups at the wide angle position; l T1 is the aerial space between the first and second lens groups at the narrow or telescopic angle position; l T2 is the aerial space between the second and third lens groups at the narrow or telescopic angle position; and ΣP 3 is the Petzval sum of the third lens group when the overall focal length is estimated as 1.0 at the wide angle position, and said zoom lens systems composed of twelve lenses grouped in three lens groups, in order from the object side to the image side, the first lens group having three lenses, with the first and second lenses L 1 , L 2 being negative lenses, and third lens L 3 being a positive lens, the second lens group having six lenses, with the fourth, fifth and sixth lenses L 4 , L 5 , L 6 all being positive lenses, with the seventh lens L 7 being negative, and with the eighth and ninth lenses L 8 , L 9 both being positive, an aperture A disposed between lenses L 7 and L 8 , the third lens group having three lenses, with the tenth lens L 10 being a positive lens, with the eleventh lens L 11 being a negative double concave lens, and with the twelfth lens L 12 being a positive lens, a fixed diaphragm B disposed adjacent the image side of the twelfth lens L 12 , wherein the radii of curvature r 1 to r 24 , the spacing or thickness d 1 to d 23 , the refractive indices n 1 to n 12 and Abbe numbers ν 1 to ν 12 of the lenses are as follows: __________________________________________________________________________ 1 : 5.60 overall focal length f = 100 - 195 half of the viewing angle ω = 24.06 - 12.64 __________________________________________________________________________ radius of spacing and refractive index lens curvature thickness at d-line Abbe No. __________________________________________________________________________ r.sub.1 = 224.091 L.sub.1 d.sub.1 = 3.61 n.sub.1 = 1.83400 ν.sub.1 = 37.2 r.sub.2 = 52.831 d.sub.2 = 11.96 first r.sub.3 = -631.977 lens L.sub.2 d.sub.3 = 2.93 n.sub.2 = 1.72916 ν.sub.2 = 54.7 group r.sub.2 = 630.769 d.sub.4 = 3.05 r.sub.5 = 77.073 L.sub.3 d.sub.5 = 6.44 n.sub.5 = 1.80518 ν.sub.1 = 25.4 r.sub.6 = 208.593 d.sub.6 = 60.41 r.sub.7 = 85.176 L.sub.4 d.sub.7 = 6015 n.sub.4 = 1.64000 ν.sub.4 = 60.1 r.sub.8 = 528.837 d.sub.8 = 0.12 r.sub.9 = 59.403 L.sub.5 d.sub.9 = 5.46 n.sub.5 = 1.69680 ν.sub.5 = 55.5 r.sub.10 = 120.931 d.sub.10 = 0.12 r.sub.11 = 42.802 second L.sub.6 d.sub.11 = 5.07 n.sub.6 = 1.51633 ν.sub.6 = 64.1 lens r.sub.12 = 65.623 group d.sub.12 = 10.07 r.sub.13 = 192.384 L.sub.7 d.sub.13 = 2.44 n.sub.7 = 1.8.518 ν.sub.7 = 25.4 r.sub.14 = 35.021 d.sub.14 = 7.51 r.sub.15 = 247.823 L.sub.8 d.sub.15 = 3.90 n.sub.8 = 1.51821 ν.sub.8 = 65.0 r.sub.16 = -126.779 d.sub.16 = 0.12 r.sub.16 = 64.027 L.sub.9 d.sub.17 = 3.90 n.sub.9 = 1.51821 ν.sub.9 = 65.0 r.sub.18 = 377.138 d.sub.18 = 11.73 r.sub.19 = 2820.048 L.sub.10 d.sub.19 = 3.71 n.sub.10 = 1.59270 ν.sub.10 = 35.3 r.sub.20 = -71.466 d.sub.20 = 2.43 third r.sub.21 = -82.822 lens L.sub.11 d.sub.21 = 1.95 n.sub.11 = 1.64000 ν.sub.11 = 60.1 group r.sub.22 = 35.594 d.sub.22 = 1.17 r.sub.23 = 39.030 L.sub.12 d.sub.23 = 3.71 n.sub.12 = 1.72916 ν.sub.12 = 54.7 r.sub.24 = 105.609 __________________________________________________________________________ overall focal length 100 150 195 __________________________________________________________________________ d.sub.6 60.41 20.30 1.02 d.sub.18 11.73 6.30 3.70 __________________________________________________________________________ ##STR10## ##STR11## ##STR12## ΣP.sub.3 = -0.353 __________________________________________________________________________

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1983-04-08	1983-10-08	1984-04-08	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1987-04-08	1987-10-08	1988-04-08	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1991-04-08	1991-10-08	1992-04-08	$7700.00	Window Closed / Lapsed

Zoom lens having a small distortion aberration

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