Macro lens system

Claim 2

A macro lens system comprising a first positive meniscus lens component having a convex surface on the object side, a second naegative cemented meniscus lens component consisting of a positive element and a negative element and having a convex surface on the object side, a third negative cemented meniscus lens component consisting of a positive element and a negative element and having a convex surface on the image side, and a fourth positive meniscus lens component having a convex surface on the image side, said macro lens system satisfying the following conditions: 1.7<n.sub.1, n.sub.6 ( 1) 50<ν.sub.1, ν.sub.6, 60<ν.sub.2, ν.sub.5 ( 2) 0.118f<d.sub.3 +d.sub.4 <0.128f (3) 0.184f<d.sub.5 <0.211f ( (4) 1.0<|r.sub.5 /r.sub.6 |<1.10 (5) 1.2<|r.sub.10 /r.sub.1 |<1.36 (6) 1.0<|r.sub.8 /r.sub.3 |<1.1 (7) 0.95<(d.sub.3 +d.sub.4)/(d.sub.6 +d.sub.7)<1.04 (8) wherein the reference symbol f represents focal length of said macro lens system as a whole, the reference symbols n 1 and n 6 designate refractive indices of said first lens component and said fourth lens component respectively, the reference symbols ν 1 , ν 2 , ν 5 and ν 6 denote Abbe's numbers of said first lens component, the object side element of said second lens component, the image side element of said third lens component and said fourth lens component respectively, the reference symbols d 3 , d 4 , d 6 and d 7 represent thicknesses of both the elements of said second lens component and both the elements of said third lens component respectively, the reference symbol d 5 designates airspace reserved between said second and third lens components, and the reference symbols r 1 , r 3 , r 5 , r 6 , r 8 and r 10 denote radii of curvature on the object side surface of said first lens component, the object side surface and image side surface of said second lens component, the object side surface and image side surface of said third lens component and the image side surface of said fourth lens component respectively.

Claim 3

A macro lens system according to claim 1 wherein the object side element of said second lens component and the image side element of said third lens component are made of glass materials having large θ gF values: wherein θ gF is defined as (n g -n F )/(n f -n C ).

Claim 4

A macro lens system according to claim 1 having the following numerical data: ______________________________________ r.sub.1 = 44.067 d.sub.1 = 6.448 n.sub.1 = 1.72916 ν.sub.1 = 54.68 r.sub.2 = 422.461 d.sub.2 = 0.474 r.sub.3 = 31.229 d.sub.3 = 9.238 n.sub.2 = 1.617 ν.sub.2 = 62.79 r.sub.4 = 305.343 d.sub.4 = 3.027 n.sub.3 = 1.7495 ν.sub.3 = 35.27 r.sub.5 = 23.375 d.sub.5 = 20.24 r.sub.6 = -22.540 d.sub.6 = 3.053 n.sub.4 = 1.804 ν.sub.4 = 46.57 r.sub.7 = 1002.356 d.sub.7 = 9.212 n.sub.5 = 1.617 ν.sub.5 = 62.79 r.sub.8 = -33.421 d.sub.8 = 1.763 r.sub.9 = -701.974 d.sub.9 = 5.659 n.sub.6 = 1.755 ν.sub.6 = 52.33 r.sub.10 = -58.009 f = 100, n.sub.1 = 1.72916, n.sub.6 = 1.755 ν.sub.1 = 54.68, ν.sub.6 = 52.33, ν.sub.2 = 62.79 ν.sub.5 = 62.79, d.sub.3 + d.sub.4 = 12.265, d.sub.5 = 20.24 |r.sub.5 /r.sub.6 | = 1.037, |r.sub.10 /r.sub.1 | = 1.316 |r.sub.8 /r.sub.3 | = 1.070, (d.sub.3 + d.sub.4)/(d.sub.6 + d.sub.7) = 1 ______________________________________ wherein the reference symbols r 1 through r 10 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 9 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 6 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 6 represent Abbe's numbers of the respective lens elements.

Claim 5

A macro lens system according to claim 1 having the following numerical data: ______________________________________ r.sub.1 = 43.339 d.sub.1 = 6.689 n.sub.1 = 1.72916 ν.sub.1 = 54.68 r.sub.2 = 397.833 d.sub.2 = 0.771 r.sub.3 = 32.131 d.sub.3 = 8.450 n.sub.2 = 1.617 ν.sub.2 = 62.79 r.sub.4 = 332.835 d.sub.4 = 3.842 n.sub.3 = 1.7495 ν.sub.3 = 35.27 r.sub.5 = 23.613 d.sub.5 = 19.166 r.sub.6 = -22.311 d.sub.6 = 3.163 n.sub.4 = 1.804 ν.sub.4 = 46.57 r.sub.7 = 677.820 d.sub.7 = 9.221 n.sub.5 = 1.617 ν.sub.5 = 62.79 r.sub.8 = -33.740 d.sub.8 = 0.795 r.sub.9 = -621.241 d.sub.9 = 6.118 n.sub.6 = 1.755 ν.sub.6 = 52.33 r.sub.10 = -55.058 f = 100, n.sub.1 = 1.72916, n.sub.6 = 1.755 ν.sub.1 = 54.68, ν.sub.6 = 52.33, ν.sub.2 = 62.79 ν.sub.5 = 62.79, d.sub.3 + d.sub.4 = 12.292, d.sub.5 = 19.166 |r.sub.5 /r.sub.6 | = 1.058, |r.sub.10 /r.sub.1 | = 1.27 |r.sub.8 /r.sub.3 | = 1.050, (d.sub.3 + d.sub.4)/(d.sub.6 + d.sub.7) = 0.993 ______________________________________ wherein the reference symbols r 1 through r 10 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 9 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 6 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 6 represent Abbe's numbers of the respective lens elements.

Claim 6

A macro lens system according to claim 1 having the following numerical data: ______________________________________ r.sub.1 = 44.019 d.sub.1 = 7.108 n.sub.1 = 1.72916 ν.sub.1 = 54.68 r.sub.2 = 419.364 d.sub.2 = 0.395 r.sub.3 = 31.332 d.sub.3 = 9.250 n.sub.2 = 1.617 ν.sub.2 = 62.79 r.sub.4 = 362.464 d.sub.4 = 3.011 n.sub.3 = 1.7495 ν.sub.3 = 35.27 r.sub.5 = 23.368 d.sub.5 = 20.277 r.sub.6 = -22.266 d.sub.6 = 3.017 n.sub.4 = 1.804 ν.sub.4 = 46.57 r.sub.7 = -8503.992 d.sub.7 = 9.279 n.sub.5 = 1.617 ν.sub.5 = 62.79 r.sub.8 = -33.338 d.sub.8 = 0.5 r.sub.9 = -550.872 d.sub.9 = 6.844 n.sub.6 = 1.755 ν.sub.6 = 52.33 r.sub.10 = -56.032 f = 100, n.sub.1 = 1.72916, n.sub.6 = 1.755 ν.sub.1 = 54.68, ν.sub.6 = 52.33, ν.sub.2 = 62.79 ν.sub.5 = 62.79, d.sub.3 + d.sub.4 = 12.261, d.sub.5 = 20.277 |r.sub.5 /r.sub.6 | = 1.049, |r.sub.10 /r.sub.1 | = 1.273 |r.sub.8 /r.sub.3 | = 1.064, (d.sub.3 + d.sub.4)/(d.sub.6 + d.sub.7) = 0.997 ______________________________________ wherein the reference symbols r 1 through r 10 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 9 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 6 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 6 represent Abbe's numbers of the respective lens elements.