Microscope illuminator for both transmitted and vertical microscopy

Claim 2

In a transmitted light microscope illumination system having a light source, a collecting lens system, a field diaphragm, a collimating lens system, and a condenser with a back aperture diaphragm all in alignment and in sequence along an optical axis, the improvement comprising a zoom lens system, between said collecting lens system and said field diaphragm, said zoom system consisting of first and second lens elements movable along said axis in unison, said first lens element being a convex-plano positive singlet and said second lens element being a plano-convex positive singlet and said first and second lens elements having adjacent plano surfaces.

Claim 3

The improvement of claim 1 wherein the parameters of said first and second lens elements are: __________________________________________________________________________ Index of Abbe Lens Radius (R) Thickness (T) Spacing (S) Refraction (ND) No. (ν) __________________________________________________________________________ R.sub.5 =1.3940F 22 T.sub.3 =0.41365F ND.sub.3 =1.523 ν.sub.3 =58.60 R.sub.6 =∞ S.sub.4 =0.72389F R.sub.7 =∞ 23 T.sub.4 =0.41365F ND.sub.4 =1.523 ν.sub.4 =58.60 R.sub.8 =-1.6546 __________________________________________________________________________ wherein F is the focal length of the condenser in millimeters and refractive indices are Abbe numbers are absolute values.

Claim 4

The improvement of claim 2 wherein F is 9.67mm.

Claim 5

An illumination system for transmitted light microscopy comprising, in alignment and sequence along an optical axis, a light source, a collector lens system, a zoom lens system, a field diaphragm, a collimator lens system, and a condenser having a focal length F, said zoom lens system including convex-plano positive singlet (22) and a plano-convex positive singlet (23), said first and second elements being movable in unison along said optical axis, said collimator lens system having a double convex positive doublet (24) and a double convex positive singlet (25). being defined by the following relationship: __________________________________________________________________________ Index of Abbe Lens Radius (R) Thickness (T) Spacing (S) Refraction (ND) No. (ν) __________________________________________________________________________ R.sub.5 =1.3940F 22 T.sub.3 =0.41365F ND.sub.3 =1.523 ν.sub.3 =58.60 R.sub.6 =∞ S.sub.4 =0.72389F R.sub.7 =∞ 23 T.sub.4 =0.41365F ND.sub.4 =1.523 ν.sub.4 =58.60 R.sub.8 =-1.6546F S.sub.5 =5.8169F(4X) 4.2658F(10X) 1.7839F(100X) S.sub.6 =1.03413F R.sub.9 =10.8635F T.sub.5 =0.77559F ND.sub.5 =1.786 ν.sub.5 =25.52 24 R.sub.10 =3.9555F T.sub.6 =2.06825F ND.sub.6 =1.588 ν.sub.6 =61.19 R.sub.11 =-5.01551F S.sub.7 =5.37746F R.sub.12 =5.14478F 25 T.sub.7 =1.24095F ND.sub.7 =1.498 ν.sub.7 =66.94 R.sub.13 =-24.8263F S.sub.8 =6.72182F __________________________________________________________________________ Wherein F is in millimeters.

Claim 6

An illumination system for transmitted light microscopy comprising, in alignment and sequence along an optical axis, a light source, a collector lens system, a zoom lens system, a field diaphragm, a collimator lens system, and a condenser having a focal length F, said zoom lens system including convex-plano positive singlet (22) and a plano-convex positive singlet (23), said first and second elements being movable in unison along said optical axis, said collimator lens system having a double convex positive doublet (24) and a double convex positive singlet (25). being defined by the following relationship: __________________________________________________________________________ Index of Abbe Lens Radius (R) Thickness (T) Spacing (S) Refraction (ND) No. (ν) __________________________________________________________________________ R.sub.5 =1.3940F 22 T.sub.3 =0.41365F ND.sub.3 =1.523 ν.sub.3 =58.60 R.sub.6 =∞ S.sub.4 =0.72389F R.sub.7 =∞ 23 T.sub.4 =0.41365F ND.sub.4 =1.523 ν.sub.4 =58.60 R.sub.8 =-1.6546F S.sub.5 =5.8169F(4X) 4.2658F(10X) 1.7839F(100X) S.sub.6 =1.03413F R.sub.9 =10.8635F T.sub.5 =0.77559F ND.sub.5 =1.786 ν.sub.5 =25.52 24 R.sub.10 =3.9555F T.sub.6 =2.06825F ND.sub.6 =1.588 ν.sub.6 =61.19 R.sub.11 =-5.01551F S.sub.7 =5.37746F R.sub.12 =5.14478F 25 T.sub.7 =1.24095F ND.sub.7 =1.498 ν.sub.7 =66.94 R.sub.13 =-24.8263F S.sub.8 =6.72182F __________________________________________________________________________ Wherein F is in millimeters.

Claim 7

The illumination system according to claim 4 wherein F is 9.67mm.

Claim 8

The illumination system according to claim 4 wherein the collector lens system has a concavo-convex positive singlet (20) and a double convex positive singlet (21), said singlet (21) having an axially aspheric rear surface, and are defined by the following parameters: __________________________________________________________________________ Index of Abbe Lens Radius (R) Thickness (T) Spacing (S) Refraction (ND) No. (ν) __________________________________________________________________________ S.sub.1 =0.64633F R.sub.1 =-3.38335F 20 T.sub.1 =0.46536F ND.sub.1 =1.523 ν.sub.1 =58.60 R.sub.2 =-0.82730F S.sub.2 =0.02585F R.sub.3 =2.23395F 21 T.sub.2 =0.62048F ND.sub.2 =1.523 ν.sub.2 =58.60 R.sub.4 =-0.99343F __________________________________________________________________________ wherein R 4 has the following coefficients of asphericity: k = -1.0 d = 0.181924 × 10 -3 e = -0.361616 × 10 -5 f = 0.943675 × 10 -7 g = -0.743223 × 10 -9 and asphericity Z for any given value of x and y is defined by the equation Z = cp.sup.2 / [1 +√1 - (k + 1)c.sup.2 p.sup.2 ] + dp.sup.4 ep.sup.6 + fp.sup.8 + gp.sup.10 where c =1/R 4 and p 2 = x 2 + y 2 .

Claim 9

The illumination system according to claim 6 wherein F is 9.67mm.

Claim 10

The illumination system according to claim 4 wherein the collector lens system has a plano-convex positive singlet (26), and a plano-convex positive singlet (27) and a double convex positive singlet (28), said singlet (27) having an axially aspheric rear surface, said singlet (28) having an axially aspheric front surface and are defined by the following parameters: __________________________________________________________________________ Index of Abbe Lens Radius (R) Thickness (T) Spacing (S) Refraction (ND) No. (ν) __________________________________________________________________________ S.sub.100 =0.5171F R.sub.101 =∞ 26 T.sub.101 =0.5171F ND.sub.101 =1.523 ν.sub.101 =58.57 R.sub.102 =-0.9486F S.sub.101 =0.0103F R.sub.103 =∞ 27 T.sub.102 =0.5688F ND.sub.102 =1.523 ν.sub.102 =58.57 R.sub.104 =-1.15669F S.sub.102 =0.0103F R.sub.105 =1.61446F 28 T.sub.103 =0.5688F ND.sub.103 =1.523 ν.sub.103 =58.57 R.sub.106 =-12.7564F S.sub.103 =1.0910F(4X) 2.6422F(10X) 5.1241F(100X) __________________________________________________________________________ wherein the coefficients of asphericity for R 4 are: k = -0.99341 d = -0.50246 × 10 -4 e = -0.43451 × 10 -5 f = 0.11169 × 10 -6 g = -0.57450 × 10 -9 wherein the coefficients of asphericity for R 5 are: d = -0.59858 × 10 -4 e = -0.44852 × 10 -5 f = 0.10981 × 10 -6 g = -0.60834 × 10 -9 k = -0.98417 and asphericity Z of the respective lenses R 4 and R 5 for any given value of x and y is defined by the equation Z = cp.sup.2 / [1 + √1 - (k + 1)c.sup.2 p.sup.2 ] +dp.sup.4 + ep.sup.6 + fp.sup.8 + gp.sup.10 when c = 1/R 4 or 1/R 5 respectively and p 2 = x 2 + y 2 .

Claim 11

The illumination system according to claim 8 wherein F is 9.67mm.