Two group wide angle zoom lens system

Claim 2

A wide angle zoom lens system capable of providing a variable focal length by varying the relative position of at least two lens groups, comprising; a first lens group of overall negative refractive power, φ 1 including a first front lens component of a positive refractive power, Φ I-1 , a second intermediate lens component of a negative refractive power, Φ I-2 , located at the image side of the first lens component and a third rear lens component of a positive refractive power located at the image side of the second lens component, the second intermediate lens component further having a first lens sub-component of a refractive power, φ 1 , a second lens sub-component of a refractive power, φ 2 located at the image side of the first lens sub-component and a third lens sub-component of a refractive power, φ 3 located at the image side of the second sub-component, the respective absolute values of the lens sub-components having the following relationship, |φ 1 |>|φ 2 |>|φ 3 |; and a second lens group of overall positive refractive power, Φ II located at the image side of the first lens group including a fourth front lens component of a positive refractive power, Φ II-1 , a fifth intermediate lens component of a negative refractive power located at the image side of the fourth lens component and a sixth rear lens component of a positive refractive power located at the image side of the fifth lens component, wherein the relationship of the respective refractive powers of the zoom lens system fulfills the following conditions:

Claim 3

1≦|Φ II /Φ I |≦1.5 0.1≦|Φ.sub.i-1 /Φ.sub.i |≦0.5 0.3≦|φ.sub.1 /Φ.sub.i-2 |≦0.6 1.4≦|Φ.sub.ii-1 /Φ.sub.ii |≦1.8

Claim 4

1≦|Φ II /Φ I |≦1.5 0.1≦|Φ.sub.i-1 /Φ.sub.i |≦0.5 0.3≦|φ.sub.1 /Φ.sub.i-2 |≦0.6 1.4≦|Φ.sub.ii-1 /Φ.sub.ii |≦1.8

Claim 5

the invention of claim 1 wherein the third lens sub-component is a doublet.

Claim 6

The invention of claim 1 wherein the second lens sub-component is a doublet.

Claim 7

The invention of claim 2 wherein the fifth intermediate lens component is a doublet.

Claim 8

The invention of claim 3 wherein the fourth front lens component includes more than two lens elements.

Claim 9

The invention of claim 5 wherein the third rear lens component is a meniscus lens.

Claim 10

A compact wide angle zoom lens system capable of providing a variable focal length comprising the following design parameters; ______________________________________ f = 50 ˜ 24 FNo. = 4 Field Angle 2 ω = 47° ˜ 84° Radius of Axial Refractive Abbe Curvature Distance Index Number ______________________________________ r.sub.1 = 94.69 d.sub.1 = 6.0 N.sub.1 = 1.6000 ν.sub.1 = 64.4 r.sub.2 = 417.7 d.sub.2 = 0.2 r.sub.3 = 73.24 d.sub.3 = 1.5 N.sub.2 = 1.7435 ν.sub.2 = 49.2 r.sub.4 = 21.13 d.sub.4 = 7.5 r.sub.5 = 148.3 d.sub.5 = 1.5 N.sub.3 = 1.7435 ν.sub.3 = 49.2 r.sub.6 = 32.70 d.sub.6 = 3.5 r.sub.7 = 129.8 d.sub.7 = 4.0 N.sub.4 = 1.7106 ν.sub.4 = 43.3 r.sub.8 = -86.70 d.sub.8 = 1.0 N.sub.5 = 1.6385 ν.sub.5 =55.7 r.sub.9 = 66.78 d.sub.9 = 2.5 r.sub.10 = 33.47 d.sub.10 =3.0 N.sub.6 = 1.7174 ν.sub.6 = 29.4 r.sub.11 = 78.98 d.sub.11 = 1.66, 11.96, 27.93 r.sub.12 = 53.95 d.sub.12 = 2.5 N.sub.7 = 1.5168 ν.sub.7 = 64.0 r.sub.13 = -159.9 d.sub.13 = 0.1 r.sub.14 = 19.80 d.sub.14 = 3.36 N.sub.8 = 1.5168 ν.sub.8 = 64.0 r.sub.15 = 136.34 d.sub.15 = 0.1 r.sub.16 = 22.44 d.sub.16 = 2.0 N.sub.9 = 1.5168 ν.sub.9 = 64.0 r.sub.17 = 32.82 d.sub.17 = 4.5 r.sub.18 = -61.82 d.sub.18 = 2.0 N.sub.10 = 1.8052 ν.sub.10 = 25.4 r.sub.19 = -24.57 d.sub.19 = 0.8 N.sub.11 = 1.7569 ν.sub.11 = 29.7 r.sub.20 = 18.24 d.sub.20 = 2.19 r.sub.21 = -57.47 d.sub.21 = 2.0 N.sub.12 = 1.5168 ν.sub.12 = 64.0 r.sub.22 = -20.76 d.sub.22 = 0.1 r.sub.23 = 38.02 d.sub.23 = 2.3 N.sub.13 = 1.6000 ν.sub.13 = 64.4 r.sub.24 = -375.8 ______________________________________

Claim 11

A compact wide angle zoom lens system capable of providing a variable focal length comprising the following design parameters; ______________________________________ f = 50 ˜ 24 FNo. = 4 Field Angle 2 ω = 47° ˜ 84° Radius of Axial Refractive Abbe Curvature Distance Index Number ______________________________________ r.sub.1 = 94.69 d.sub.1 = 6.0 N.sub.1 = 1.6000 ν.sub.1 = 64.4 r.sub.2 = 417.7 d.sub.2 = 0.2 r.sub.3 = 73.24 d.sub.3 = 1.5 N.sub.2 = 1.7435 ν.sub.2 = 49.2 r.sub.4 = 21.13 d.sub.4 = 7.5 r.sub.5 = 148.3 d.sub.5 = 1.5 N.sub.3 = 1.7435 ν.sub.3 = 49.2 r.sub.6 = 32.70 d.sub.6 = 3.5 r.sub.7 = 129.8 d.sub.7 = 4.0 N.sub.4 = 1.7106 ν.sub.4 = 43.3 r.sub.8 = -86.70 d.sub.8 = 1.0 N.sub.5 = 1.6385 ν.sub.5 =55.7 r.sub.9 = 66.78 d.sub.9 = 2.5 r.sub.10 = 33.47 d.sub.10 =3.0 N.sub.6 = 1.7174 ν.sub.6 = 29.4 r.sub.11 = 78.98 d.sub.11 = 1.66, 11.96, 27.93 r.sub.12 = 53.95 d.sub.12 = 2.5 N.sub.7 = 1.5168 ν.sub.7 = 64.0 r.sub.13 = -159.9 d.sub.13 = 0.1 r.sub.14 = 19.80 d.sub.14 = 3.36 N.sub.8 = 1.5168 ν.sub.8 = 64.0 r.sub.15 = 136.34 d.sub.15 = 0.1 r.sub.16 = 22.44 d.sub.16 = 2.0 N.sub.9 = 1.5168 ν.sub.9 = 64.0 r.sub.17 = 32.82 d.sub.17 = 4.5 r.sub.18 = -61.82 d.sub.18 = 2.0 N.sub.10 = 1.8052 ν.sub.10 = 25.4 r.sub.19 = -24.57 d.sub.19 = 0.8 N.sub.11 = 1.7569 ν.sub.11 = 29.7 r.sub.20 = 18.24 d.sub.20 = 2.19 r.sub.21 = -57.47 d.sub.21 = 2.0 N.sub.12 = 1.5168 ν.sub.12 = 64.0 r.sub.22 = -20.76 d.sub.22 = 0.1 r.sub.23 = 38.02 d.sub.23 = 2.3 N.sub.13 = 1.6000 ν.sub.13 = 64.4 r.sub.24 = -375.8 ______________________________________

Claim 12

A compact wide angle zoom lens system capable of providing a variable focal length comprising the following design parameters; ______________________________________ f = 50 ˜ 24 FNo. = 4 Field Angle 2ω = 47° ˜ 84.degree . Radius of Axial Refractive Abbe Curvature Distance Index Number ______________________________________ r.sub.1 = 88.282 d.sub.1 = 5.5 N.sub.1 = 1.6129 ν.sub.1 = 37.0 r.sub.2 = 245.72 d.sub.2 = 0.2 r.sub.3 = 68.959 d.sub.3 = 1.5 N.sub.2 = 1.7425 ν.sub.2 = 52.2 r.sub.4 = 22.913 d.sub.4 = 8.0 r.sub.5 = 106.47 d.sub.5 = 4.5 N.sub.3 = 1.7352 ν.sub.3 = 40.9 r.sub.6 = -122.30 d.sub.6 = 1.0 N.sub.4 = 1.7003 ν.sub.4 = 47.7 r.sub.7 = 36.438 d.sub.7 = 3.9 r.sub.8 = 131.29 d.sub.8 = 1.2 N.sub.5 = 1.7130 ν.sub. 5 = 53.9 r.sub.9 = 80.156 d.sub.9 = 2.5 r.sub.10 = 30.936 d.sub.10 = 4.0 N.sub.6 = 1.6259 ν.sub.6 = 35.7 r.sub.11 = 59.160 d.sub.11 = 1.7, 15.7, 35.5 r.sub.12 = 53.715 d.sub.12 = 3.5 N.sub.7 = 1.5891 ν.sub.7 = 61.1 r.sub.13 = -80.203 d.sub.13 = 1.0 N.sub.8 = 1.5762 ν.sub.8 = 41.4 r.sub.14 = -152.44 d.sub.14 = 0.1 r.sub.15 = 21.005 d.sub.15 = 4.0 N.sub.9 = 1.5168 ν.sub.9 = 64.0 r.sub.16 = 115.51 d.sub.16 = 0.1 r.sub.17 = 24.086 d.sub.17 = 2.0 N.sub.10 = 1.5168 ν.sub.10 = 64.0 r.sub.18 = 34.240 d.sub.18 = 4.0 r.sub.19 = -75.602 d.sub.19 = 1.8 N.sub.11 = 1.7569 ν.sub.11 = 31.8 r.sub.20 = 19.944 d.sub.20 = 2.9 r.sub.21 = -66.497 d.sub.21 = 2.7 N.sub.12 = 1.6510 ν.sub.12 = 55.8 r.sub.22 = -31.604 d.sub.22 = 0.1 r.sub.23 = 114.90 d.sub.23 = 3.0 N.sub.13 = 1.6510 ν.sub.13 = 55.8 r.sub.24 = -49.290 ______________________________________

Claim 13

A compact wide angle zoom lens system capable of providing a variable focal length comprising the following design parameters; ______________________________________ f = 50 ˜ 24 FNo. = 4 Field Angle 2ω = 47° ˜ 84.degree . Radius of Axial Refractive Abbe Curvature Distance Index Number ______________________________________ r.sub.1 = 88.282 d.sub.1 = 5.5 N.sub.1 = 1.6129 ν.sub.1 = 37.0 r.sub.2 = 245.72 d.sub.2 = 0.2 r.sub.3 = 68.959 d.sub.3 = 1.5 N.sub.2 = 1.7425 ν.sub.2 = 52.2 r.sub.4 = 22.913 d.sub.4 = 8.0 r.sub.5 = 106.47 d.sub.5 = 4.5 N.sub.3 = 1.7352 ν.sub.3 = 40.9 r.sub.6 = -122.30 d.sub.6 = 1.0 N.sub.4 = 1.7003 ν.sub.4 = 47.7 r.sub.7 = 36.438 d.sub.7 = 3.9 r.sub.8 = 131.29 d.sub.8 = 1.2 N.sub.5 = 1.7130 ν.sub. 5 = 53.9 r.sub.9 = 80.156 d.sub.9 = 2.5 r.sub.10 = 30.936 d.sub.10 = 4.0 N.sub.6 = 1.6259 ν.sub.6 = 35.7 r.sub.11 = 59.160 d.sub.11 = 1.7, 15.7, 35.5 r.sub.12 = 53.715 d.sub.12 = 3.5 N.sub.7 = 1.5891 ν.sub.7 = 61.1 r.sub.13 = -80.203 d.sub.13 = 1.0 N.sub.8 = 1.5762 ν.sub.8 = 41.4 r.sub.14 = -152.44 d.sub.14 = 0.1 r.sub.15 = 21.005 d.sub.15 = 4.0 N.sub.9 = 1.5168 ν.sub.9 = 64.0 r.sub.16 = 115.51 d.sub.16 = 0.1 r.sub.17 = 24.086 d.sub.17 = 2.0 N.sub.10 = 1.5168 ν.sub.10 = 64.0 r.sub.18 = 34.240 d.sub.18 = 4.0 r.sub.19 = -75.602 d.sub.19 = 1.8 N.sub.11 = 1.7569 ν.sub.11 = 31.8 r.sub.20 = 19.944 d.sub.20 = 2.9 r.sub.21 = -66.497 d.sub.21 = 2.7 N.sub.12 = 1.6510 ν.sub.12 = 55.8 r.sub.22 = -31.604 d.sub.22 = 0.1 r.sub.23 = 114.90 d.sub.23 = 3.0 N.sub.13 = 1.6510 ν.sub.13 = 55.8 r.sub.24 = -49.290 ______________________________________