Microscope objective

Claim 2

A microscope objective comprising a front lens group and a rear lens group, said front lens group comprising a first positive lens component having a concave surface positioned toward the object side and made of material having a high refractive index and low dispersion, a second positive meniscus lens component made of low dispersion material and a third cemented lens component having positive power and a cemented surface convex toward the object side and comprising a lens made of low dispersion material, said rear lens group comprising a fourth positive lens component made of low dispersion material and a fifth positive cemented lens component having a rear surface convex toward the object side, said microscope objective satisfying the following conditions: n.sub.l > 1.77, ν.sub.l > 49 (1) r.sub.a > 0 (2) 3f < (r.sub.b /n.sub.b - 1) (3) 5.9 < f.sub.II /f.sub.I < 20 (4) wherein reference symbol n l represents refractive index of the first lens component, reference symbol ν l denotes Abbe's number of the first lens component, reference symbol r a designates radius of curvature of one cemented surface of the third lens component, reference symbol r b represents radius of curvature of the image side surface of the fifth lens component, reference symbol n b denotes refractive index of the image side lens element of the fifth lens component, and reference symbols f, f I and f II designate the total focal lengths of the entire lens system, the front lens groups and the rear lens group respectively.

Claim 3

A microscope objective comprising a front lens group comprising a first positive lens component, a second positive lens component and a third cemented doublet lens component, and a rear lens group comprising a fourth positive lens component and a fifth cemented doublet lens component, and said microscope objective having the following numerical data: ______________________________________ f = 1.0, NA = 0.95, WD = 0.107 r.sub.1 = -0.704 d.sub.1 = 0.59 n.sub.1 = 1.774 ν.sub.1 = 49.4 r.sub.2 = -0.591 d.sub.2 = 0.017 r.sub.3 = -5.722 d.sub.3 = 0.417 n.sub.2 = 1.4339 ν.sub.2 = 95.2 r.sub.4 = -1.164 d.sub.4 = 0.156 r.sub.5 = 21.330 d.sub.5 = 0.139 n.sub.3 = 1.74 ν.sub.3 = 28.3 r.sub.6 = 1.775 d.sub.6 = 1.077 n.sub.4 = 1.4339 ν.sub.4 = 95.2 r.sub.7 = -1.396 d.sub.7 = 0.78 r.sub.8 = 16.383 d.sub.8 = 0.933 n.sub.5 = 1.618 ν.sub.5 = 63.4 r.sub.9 = -8.101 d.sub.9 = 0.069 r.sub. 10 = 5.787 d.sub.10 = 0.174 n.sub.6 = 1.618 ν.sub.6 = 63.4 r.sub.11 = 1.212 d.sub.11 = 0.764 n.sub.7 = 1.487 ν.sub.7 = 84.5 r.sub.12 = 7.543 ##STR6## ______________________________________

Claim 4

A microscope objective comprising a front lens group comprising a first positive lens component, a second positive lens component and a third cemented doublet lens component, and a rear lens group comprising a fourth positive lens component and a fifth cemented doublet lens component, and said microscope objective having the following numerical data: ______________________________________ f = 1.0, NA = 0.95, WD = 0.107 r.sub.1 = -0.704 d.sub.1 = 0.59 n.sub.1 = 1.774 ν.sub.1 = 49.4 r.sub.2 = -0.591 d.sub.2 = 0.017 r.sub.3 = -5.722 d.sub.3 = 0.417 n.sub.2 = 1.4339 ν.sub.2 = 95.2 r.sub.4 = -1.164 d.sub.4 = 0.156 r.sub.5 = 21.330 d.sub.5 = 0.139 n.sub.3 = 1.74 ν.sub.3 = 28.3 r.sub.6 = 1.775 d.sub.6 = 1.077 n.sub.4 = 1.4339 ν.sub.4 = 95.2 r.sub.7 = -1.396 d.sub.7 = 0.78 r.sub.8 = 16.383 d.sub.8 = 0.933 n.sub.5 = 1.618 ν.sub.5 = 63.4 r.sub.9 = -8.101 d.sub.9 = 0.069 r.sub. 10 = 5.787 d.sub.10 = 0.174 n.sub.6 = 1.618 ν.sub.6 = 63.4 r.sub.11 = 1.212 d.sub.11 = 0.764 n.sub.7 = 1.487 ν.sub.7 = 84.5 r.sub.12 = 7.543 ##STR6## ______________________________________

Claim 5

A microscope objective comprising a front lens group comprising a first positive lens component, a second positive lens component and a third cemented doublet lens component, and a rear lens group comprising a fourth positive lens component and a fifth cemented doublet lens component, and said microscope objective having the following numerical data: ______________________________________ f = 1.0, NA = 0.95, WD = 0.1 r.sub.1 = -0.809 d.sub.1 = 0.607 n.sub.1 = 1.774 ν.sub.1 = 49.4 r.sub.2 = -0.624 d.sub.2 = 0.017 r.sub.3 = -5.270 d.sub.3 = 0.451 n.sub.2 = 1.449 ν.sub.2 = 95.2 r.sub.4 = -1.182 d.sub.4 = 0.087 r.sub.5 = -10.419 d.sub.5 = 0.139 n.sub.3 = 1.74 ν.sub.3 = 31.7 r.sub.6 = 1.993 d.sub.6 = 1.075 n.sub.4 = 1.449 ν.sub.4 = 95.2 r.sub.7 = -1.352 d.sub.7 = 0.069 r.sub.8 = 11.541 d.sub.8 = 0.346 n.sub.5 = 1.4866 ν.sub.5 = 84.5 r.sub.9 = -5.366 d.sub.9 = 1.157 r.sub.10 = 5.488 d.sub.10 = 0.173 n.sub.6 = 1.618 ν.sub.6 = 63.4 r.sub.11 = 1.236 d.sub.11 = 0.763 n.sub.7 = 1.4866 ν.sub.7 = 84.5 r.sub.12 = 10.218 ##STR7## ______________________________________

Claim 6

A microscope objective comprising a front lens group comprising a first positive lens component, a second positive lens component and a third cemented doublet lens component, and a rear lens group comprising a fourth positive lens component and a fifth cemented doublet lens component, and said microscope objective having the following numerical data: ______________________________________ f = 1.0, NA = 0.95, WD = 0.1 r.sub.1 = -0.809 d.sub.1 = 0.607 n.sub.1 = 1.774 ν.sub.1 = 49.4 r.sub.2 = -0.624 d.sub.2 = 0.017 r.sub.3 = -5.270 d.sub.3 = 0.451 n.sub.2 = 1.449 ν.sub.2 = 95.2 r.sub.4 = -1.182 d.sub.4 = 0.087 r.sub.5 = -10.419 d.sub.5 = 0.139 n.sub.3 = 1.74 ν.sub.3 = 31.7 r.sub.6 = 1.993 d.sub.6 = 1.075 n.sub.4 = 1.449 ν.sub.4 = 95.2 r.sub.7 = -1.352 d.sub.7 = 0.069 r.sub.8 = 11.541 d.sub.8 = 0.346 n.sub.5 = 1.4866 ν.sub.5 = 84.5 r.sub.9 = -5.366 d.sub.9 = 1.157 r.sub.10 = 5.488 d.sub.10 = 0.173 n.sub.6 = 1.618 ν.sub.6 = 63.4 r.sub.11 = 1.236 d.sub.11 = 0.763 n.sub.7 = 1.4866 ν.sub.7 = 84.5 r.sub.12 = 10.218 ##STR7## ______________________________________

Claim 7

A microscope objective comprising a front lens group comprising a first positive lens component, a second positive lens component and a third cemented doublet lens component, and a rear lens group comprising a fourth positive lens component and a fifth cemented doublet lens component, and said microscope objective having the following numerical data: ______________________________________ f = 1.0, NA = 0.95, WD = 0.094 r.sub.1 = -0.819 d.sub.1 = 0.587 n.sub.1 = 1.774 ν.sub.1 = 49.4 r.sub.2 = -0.604 d.sub.2 = 0.017 r.sub.3 = -10.335 d.sub.3 = 0.414 n.sub.2 = 1.487 ν.sub.2 = 84.5 r.sub.4 = -1.219 d.sub.4 = 0.115 r.sub.5 = -11.338 d.sub.5 = 0.138 n.sub.3 = 1.74 ν.sub.3 = 31.7 r.sub.6 = 1.723 d.sub.6 = 1.07 n.sub.4 = 1.4339 ν.sub.4 = 95.2 r.sub.7 = -1.303 d.sub.7 = 0.069 r.sub.8 = 71.639 d.sub.8 = 0.380 n.sub.5 = 1.618 ν.sub.5 = 63.4 r.sub.9 = -5.536 d.sub.9 = 0.518 r.sub.10 = 6.840 d.sub.10 = 0.173 n.sub.6 = 1.618 ν.sub.6 = 63.4 r.sub.11 = 1.253 d.sub.11 = 0.759 n.sub.7 = 1.486 ν.sub.7 = 84.5 r.sub.12 = 21.664 ##STR8## ______________________________________

Claim 8

A microscope objective comprising a front lens group comprising a first positive lens component, a second positive lens component and a third cemented doublet lens component, and a rear lens group comprising a fourth positive lens component and a fifth cemented doublet lens component, and said microscope objective having the following numerical data: ______________________________________ f = 1.0, NA = 0.95, WD = 0.094 r.sub.1 = -0.819 d.sub.1 = 0.587 n.sub.1 = 1.774 ν.sub.1 = 49.4 r.sub.2 = -0.604 d.sub.2 = 0.017 r.sub.3 = -10.335 d.sub.3 = 0.414 n.sub.2 = 1.487 ν.sub.2 = 84.5 r.sub.4 = -1.219 d.sub.4 = 0.115 r.sub.5 = -11.338 d.sub.5 = 0.138 n.sub.3 = 1.74 ν.sub.3 = 31.7 r.sub.6 = 1.723 d.sub.6 = 1.07 n.sub.4 = 1.4339 ν.sub.4 = 95.2 r.sub.7 = -1.303 d.sub.7 = 0.069 r.sub.8 = 71.639 d.sub.8 = 0.380 n.sub.5 = 1.618 ν.sub.5 = 63.4 r.sub.9 = -5.536 d.sub.9 = 0.518 r.sub.10 = 6.840 d.sub.10 = 0.173 n.sub.6 = 1.618 ν.sub.6 = 63.4 r.sub.11 = 1.253 d.sub.11 = 0.759 n.sub.7 = 1.486 ν.sub.7 = 84.5 r.sub.12 = 21.664 ##STR8## ______________________________________

Claim 9

A microscope objective comprising a front lens group comprising a first positive lens component, a second positive lens component and a third positive cemented doublet lens component, and a rear lens group comprising a fourth positive lens component and a fifth cemented triplet lens component, and said microscope objective having the following numerical data: ______________________________________ f = 1.0, NA = 0.95, WD = 0.129 r.sub.1 = -0.911 d.sub.1 = 0.598 n.sub.1 = 1.774 ν.sub.1 = 49.4 r.sub.2 = -0.704 d.sub.2 = 0.019 r.sub.3 = -4.929 d.sub.3 = 0.394 n.sub.2 = 1.434 ν.sub.2 = 95.2 r.sub.4 = -1.113 d.sub.4 = 0.179 r.sub.5 = -7.246 d.sub.5 = 0.239 n.sub.3 = 1.689 ν.sub.3 = 31.1 r.sub.6 = 2.17 d.sub.6 = 0.837 n.sub.4 = 1.487 ν.sub.4 = 84.5 r.sub.7 = -1.553 d.sub.7 = 0.048 r.sub.8 = 8.052 d.sub.8 = 0.478 n.sub.5 = 1.618 ν.sub.5 = 63.4 r.sub.9 = -3.59 d.sub.9 = 0.359 r.sub.10 = 9.768 d.sub.10 = 0.263 n.sub.6 = 1.618 ν.sub.6 = 63.4 r.sub.11 = 1.143 d.sub.11 = 0.956 n.sub.7 = 1.434 ν.sub.7 = 95.2 r.sub.12 = -3.255 d.sub.12 = 0.263 n.sub.8 = 1.487 ν.sub.8 = 70.2 r.sub.13 = 45.024 ##STR9## ______________________________________

Claim 10

A microscope objective comprising a front lens group comprising a first positive lens component, a second positive lens component and a third positive cemented doublet lens component, and a rear lens group comprising a fourth positive lens component and a fifth cemented triplet lens component, and said microscope objective having the following numerical data: ______________________________________ f = 1.0, NA = 0.95, WD = 0.129 r.sub.1 = -0.911 d.sub.1 = 0.598 n.sub.1 = 1.774 ν.sub.1 = 49.4 r.sub.2 = -0.704 d.sub.2 = 0.019 r.sub.3 = -4.929 d.sub.3 = 0.394 n.sub.2 = 1.434 ν.sub.2 = 95.2 r.sub.4 = -1.113 d.sub.4 = 0.179 r.sub.5 = -7.246 d.sub.5 = 0.239 n.sub.3 = 1.689 ν.sub.3 = 31.1 r.sub.6 = 2.17 d.sub.6 = 0.837 n.sub.4 = 1.487 ν.sub.4 = 84.5 r.sub.7 = -1.553 d.sub.7 = 0.048 r.sub.8 = 8.052 d.sub.8 = 0.478 n.sub.5 = 1.618 ν.sub.5 = 63.4 r.sub.9 = -3.59 d.sub.9 = 0.359 r.sub.10 = 9.768 d.sub.10 = 0.263 n.sub.6 = 1.618 ν.sub.6 = 63.4 r.sub.11 = 1.143 d.sub.11 = 0.956 n.sub.7 = 1.434 ν.sub.7 = 95.2 r.sub.12 = -3.255 d.sub.12 = 0.263 n.sub.8 = 1.487 ν.sub.8 = 70.2 r.sub.13 = 45.024 ##STR9## ______________________________________

Claim 11

A microscope objective comprising a front lens group comprising a first positive lens component, a second positive lens component and a third cemented triplet lens component, and a rear lens group comprising a fourth positive lens component and a fifth cemented doublet lens component, and said microscope objective having the following numerical data: ______________________________________ f = 1.0, NA = 0.95, WD = 0.113 r.sub.1 = -0.687 d.sub.1 = 0.607 n.sub.1 = 1.774 ν.sub.1 = 49.4 r.sub.2 = -0.59 d.sub.2 = 0.019 r.sub.3 = -3.657 d.sub.3 = 0.428 n.sub.2 = 1.434 ν.sub.2 = 95.2 r.sub.4 = -1.167 d.sub.4 = 0.19 r.sub.5 = -5.948 d.sub.5 = 0.19 n.sub.3 = 1.667 ν.sub.3 = 33.0 r.sub.6 = 1.979 d.sub.6 = 1.0 n.sub.4 = 1.434 ν.sub.4 = 95.2 r.sub.7 = -1.204 d.sub.7 = 0.262 n.sub.5 = 1.613 ν.sub.5 = 43.8 r.sub.8 = -1.448 d.sub.8 = 0.071 r.sub.9 = 7.937 d.sub.9 = 0.547 n.sub.6 = 1.618 ν.sub.6 = 63.4 r.sub.10 = -6.486 d.sub.10 = 0.094 r.sub.11 = 2.347 d.sub.11 = 0.19 n.sub.7 = 1.639 ν.sub.7 = 44.9 r.sub.12 = 1.218 d.sub.12 = 0.785 n.sub.8 = 1.487 ν.sub.8 = 84.5 r.sub.13 = 1.786 ##STR10## ______________________________________

Claim 12

A microscope objective comprising a front lens group comprising a first positive lens component, a second positive lens component and a third cemented triplet lens component, and a rear lens group comprising a fourth positive lens component and a fifth cemented doublet lens component, and said microscope objective having the following numerical data: ______________________________________ f = 1.0, NA = 0.95, WD = 0.113 r.sub.1 = -0.687 d.sub.1 = 0.607 n.sub.1 = 1.774 ν.sub.1 = 49.4 r.sub.2 = -0.59 d.sub.2 = 0.019 r.sub.3 = -3.657 d.sub.3 = 0.428 n.sub.2 = 1.434 ν.sub.2 = 95.2 r.sub.4 = -1.167 d.sub.4 = 0.19 r.sub.5 = -5.948 d.sub.5 = 0.19 n.sub.3 = 1.667 ν.sub.3 = 33.0 r.sub.6 = 1.979 d.sub.6 = 1.0 n.sub.4 = 1.434 ν.sub.4 = 95.2 r.sub.7 = -1.204 d.sub.7 = 0.262 n.sub.5 = 1.613 ν.sub.5 = 43.8 r.sub.8 = -1.448 d.sub.8 = 0.071 r.sub.9 = 7.937 d.sub.9 = 0.547 n.sub.6 = 1.618 ν.sub.6 = 63.4 r.sub.10 = -6.486 d.sub.10 = 0.094 r.sub.11 = 2.347 d.sub.11 = 0.19 n.sub.7 = 1.639 ν.sub.7 = 44.9 r.sub.12 = 1.218 d.sub.12 = 0.785 n.sub.8 = 1.487 ν.sub.8 = 84.5 r.sub.13 = 1.786 ##STR10## ______________________________________