Ultra-high resolution reducing lens system

Claim 2

An ultra-high resolution reducing lens system comprising a lens group I and lens group II arranged by providing a large airspace between said lens groups I and II, said lens group I comprising a first lens component and second lens component, said first lens component being a positive lens, said second lens component comprising at least one negative meniscus lens convex toward the object side, said lens group II comprising a third lens component, fourth lens component, fifth lens component and sixth lens component, said third lens component being a cemented positive doublet consisting of a biconvex lens and negative meniscus lens, said fourth lens component being a positive lens, said fifth lens component being a cemented positive doublet consisting of a negative meniscus lens and positive meniscus lens, said sixth lens component being a negative meniscus lens concave toward the image side, said ultra-high resolution reducing lens system satisfying the following conditions: (1) 1.1 f < r A < 1.5 f (2) 0.7 f < r B < 1.0 f (3) -0.5 < f II /f I < -0.1 (4) -0.3 < n A - n B < 0.25 wherein reference symbol f represents the focal length of the lens system as a whole, reference symbol f I represents the total focal length of the lens group I, reference symbol f II represents the total focal length of the lens group II, reference symbols r A and r B respectively represent radii of curvature of lens surfaces on the object side and image side of the sixth lens component arranged closest to the image side in the lens group II, and reference symbols n A and n B respectively represent refractive indices of the biconvex lens and negative lens constituting the third lens component L 3 .

Claim 3

An ultra-high resolution reducing lens system according to claim 1, in which said second lens component consists of a negative meniscus lens, said ultra-high resolution reducing lens system having numerical values as given below: ______________________________________ f = 1.0 β = -0.01 F/1.0 r.sub.1 = 32.351 d.sub.1 = 0.265 n.sub.1 = 1.56873 ν.sub.1 = 63.16 r.sub.2 = -6.734 d.sub.2 = 0.096 r.sub.3 = 4.114 d.sub.3 = 0.235 n.sub.2 = 1.51742 ν.sub.2 = 52.29 r.sub.4 = 1.230 d.sub.4 = 5.361 r.sub.5 = 3.362 d.sub.5 = 0.867 n.sub.3 = 1.51633 ν.sub.3 = 64.15 r.sub.6 = -2.197 d.sub.6 = 0.096 n.sub.4 = 1.80518 ν.sub.4 = 25.43 r.sub.7 = -3.988 d.sub.7 = 0.132 r.sub.8 = 2.493 d.sub.8 = 0.389 n.sub.5 = 1.56873 ν.sub.5 = 63.16 r.sub.9 = 21.991 d.sub.9 = 0.015 r.sub.10 = 1.720 d.sub.10 = 0.188 n.sub.6 = 1.80518 ν.sub.6 = 25.43 r.sub.11 = 0.848 d.sub.11 = 0.740 n.sub.7 = 1.66680 ν.sub.7 = 33.04 r.sub.12 = 2.561 d.sub.12 = 0.015 r.sub.13 = 1.222 d.sub.13 = 0.540 n.sub.8 = 1.75520 ν.sub.8 = 27.51 r.sub.14 = 0.818 object distance = 97.238 image distance = 0.924 f.sub.I = 5.731 f.sub.II = 1.554 ______________________________________ Wherein, reference symbols r 1 , r 2 . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 , d 2 . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 . . . respectively represent refractive indices of respective lenses, reference symbols ν 1 , ν 2 . . . respectively represent Abbe's numbers of respective lenses, and reference symbol β represents magnification.

Claim 4

An ultra-high resolution reducing lens system according to claim 1, in which said second lens component consists of two negative meniscus lenses, said ultra-high resolution reducing lens system having numerical value as given below: ______________________________________ f = 1.0 β = -0.01 F/1.0 r.sub.1 = -13.168 d.sub.1 = 0.289 n.sub.1 = 1.72000 ν.sub.1 = 50.25 r.sub.2 = -5.556 d.sub.2 = 0.036 r.sub.3 = 1.422 d.sub.3 = 0.170 n.sub.2 = 1.51742 ν.sub.2 = 52.29 r.sub.4 = 1.189 d.sub.4 = 0.647 r.sub.5 = 2.686 d.sub.5 = 0.215 n.sub.3 = 1.51633 ν.sub.3 = 64.15 r.sub.6 = 1.480 d.sub.6 = 4.940 r.sub.7 = -40.089 d.sub.7 = 0.838 n.sub.4 = 1.51633 ν.sub.4 = 64.15 r.sub.8 = -1.340 d.sub.8 = 0.126 n.sub.5 = 1.80518 ν.sub.5 = 25.43 r.sub.9 = -2.542 d.sub.9 = 0.104 r.sub.10 = 2.191 d.sub.10 = 0.370 n.sub.6 = 1.65160 ν.sub.6 = 58.67 r.sub.11 = -13.790 d.sub.11 = 0.014 r.sub.12 = 1.503 d.sub.12 = 0.156 n.sub.7 = 1.80518 ν.sub.7 = 25.43 r.sub.13 = 1.201 d.sub.13 = 0.605 n.sub.8 = 1.65830 ν.sub.8 = 57.33 r.sub.14 = 2.731 d.sub.14 = 0.014 r.sub.15 = 1.214 d.sub.15 = 0.437 n.sub.9 = 1.74950 ν.sub.9 = 35.19 r.sub.16 = 0.749 object distance = 95.704 image distance = 0.910 f.sub.I = -9.006 f.sub.II = 1.326 ______________________________________ Wherein, reference symbols r 2 , r 2 . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 , d 2 . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 . . . respectively represent refractive indices of respective lenses, reference symbols ν 1 , ν 2 . . . respectively represent Abbe's numbers of respective lenses, and reference symbol β represents magnification.

Claim 5

An ultra-high resolution reducing lens system according to claim 1, in which said lens group II further comprises a positive meniscus lens concave toward the object side and arranged on the object side of said third lens component.

Claim 6

An ultra-high resolution reducing lens system according to claim 4, in which said second lens component consists of a negative meniscus lens, said ultra-high resolution reducing lens system having numerical values as given below: ______________________________________ f = 1 β = -0.01 F/1.0 r.sub.1 = 55.016 d.sub.1 = 0.286 n.sub.1 = 1.72151 ν.sub.1 = 29.24 r.sub.2 = -6.132 d.sub.2 = 0.066 r.sub.3 = 4.244 d.sub.3 = 0.198 n.sub.2 = 1.51633 ν.sub.2 = 64.15 r.sub.4 = 1.082 d.sub.4 = 4.873 r.sub.5 = -3.728 d.sub.5 = 0.349 n.sub.3 = 1.63854 ν.sub.3 = 55.38 r.sub.6 = -1.990 d.sub.6 = 0.193 r.sub.7 = 2.203 d.sub.7 = 0.848 n.sub.4 = 1.51633 ν.sub.4 = 64.15 r.sub.8 = -2.151 d.sub.8 = 0.078 n.sub.5 = 1.80518 ν.sub.5 = 25.43 r.sub.9 = 7.315 d.sub.9 = 0.102 r.sub.10 = 2.189 d.sub.10 = 0.421 n.sub.6 = 1.72151 ν.sub.6 = 29.24 r.sub.11 = 8.598 d.sub.11 = 0.015 r.sub.12 = 1.555 d.sub.12 = 0.185 n.sub.7 = 1.80518 ν.sub.7 = 25.43 r.sub.13 = 0.849 d.sub.13 = 0.678 n.sub.8 = 1.66680 ν.sub.8 = 33.04 r.sub.14 = 2.906 d.sub.14 = 0.015 r.sub.15 = 1.353 d.sub.15 = 0.430 n.sub.9 = 1.74950 ν.sub.9 = 35.19 -r.sub.16 = 0.905 object distance = 97.594 image distance = 0.927 f.sub.I = -4.861 f.sub.II = 1.596 ______________________________________ Wherein, reference symbols r 1 , r 2 . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 , d 2 . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 . . . respectively represent refractive indices of respective lenses, reference symbols ν 1 , ν 2 . . . respectively represent Abbe's numbers of respective lenses, and reference symbol β represents magnification.

Claim 7

An ultra-high resolution reducing lens system according to claim 4, in which said second lens component consists of two negative meniscus lenses, said ultra-high resolution reducing lens system having numerical values as given below: ______________________________________ f = 1 β = -0.01 F/1.0 r.sub.1 = 7.249 d.sub.1 = 0.270 n.sub.1 = 1.72151 ν.sub.1 = 29.24 r.sub.2 = -26.950 d.sub.2 = 0.014 r.sub.3 = 1.796 d.sub.3 = 0.191 n.sub.2 = 1.51633 ν.sub.2 = 64.15 r.sub.4 =1.222 d.sub.4 = 0.681 r.sub.5 = 3.288 d.sub.5 = 0.219 n.sub.3 = 1.51633 ν.sub.3 = 64.15 r.sub.6 = 1.205 d.sub.6 = 3.935 r.sub.7 = -8.568 d.sub.7 = 0.459 n.sub.4 = 1.63854 ν.sub.4 = 55.38 r.sub.8 = -2.256 d.sub.8 = 0.239 r.sub.9 = 5.154 d.sub.9 = 0.846 n.sub.5 = 1.51633 ν.sub.5 = 64.15 r.sub.10 = -1.687 d.sub.10 = 0.140 n.sub.6 = 1.80518 ν.sub.6 = 25.43 r.sub.11 = 66.631 d.sub.11 = 0.136 r.sub.12 = 2.022 d.sub.12 = 0.414 n.sub.7 = 1.72342 ν.sub.7 = 37.95 r.sub.13 = -63.263 d.sub.13 = 0.016 r.sub.14 = 1.622 d.sub.14 = 0.158 n.sub.8 = 1.80518 ν.sub.8 = 25.43 r.sub.15 = 0.783 d.sub.15 = 0.652 n.sub.9 = 1.66680 ν.sub.9 = 33.04 r.sub.16 = 3.491 d.sub.16 = 0.016 r.sub.17 = 1.326 d.sub.17 = 0.420 n.sub.10 = 1.74950 ν.sub.10 = 35.19 r.sub.18 = 0.833 object distance = 96.646 image distance = 0.932 f.sub.I = -4.45 f.sub. II = 1.499 ______________________________________ Wherein, reference symbols r 1 , r 2 . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d 1 , d 2 . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n 1 , n 2 . . . respectively represent refractive indices of respective lenses, reference symbols ν 1 , ν 2 . . . respectively represent Abbe's numbers of respective lenses, and reference symbol β represents mangification.