Objective lens
An objective lens comprises a housing, an iris diaphragm and a plurality of lens groups. For focusing the objective lens while minimizing the variation of the image angle at least two lens groups are adapted to be moved relative to the housing. The one lens group is arranged in front of the iris diaphragm. The other lens group is arranged at least partially behind the iris diaphragm.
1. An objective lens having a housing, an iris diaphragm, and a plurality of lens groups, wherein, for focusing said objective lens while minimizing a variation of an image angle, at least two lens groups are adapted to be moved relative to said housing, one of said two lens groups being arranged in front of said iris diaphragm, and the other of said two lens groups being arranged at least partially behind said iris diaphragm;
wherein in said objective lens the condition:
f ′( e )= f ′(∞)/(1− f ′( e )*β( e )/ APF )
is fulfilled with a maximum deviation of less than 10%, wherein
f′(e) is the focal length of said objective lens when a distance e to an object is set;
f′(∞) is the focal length of said objective lens when a distance ∞ to an object is set;
β(e) is the imaging scale of said objective lenses when a distance ∞ to an object is set; and
APF is the distance between the exit pupil and the focal point.
2. The objective lens of claim 1 , wherein said objective lens is a zoom objective lens.
3. The objective lens of claim 1 , wherein said objective lens comprises four lens groups with a total of twelve lenses, of which a sixth and a seventh lens configure a common surface having the following data:
Focal Length:
49.99 mm
Aperture Stop Area:
17
Front Focus Group (III):
Surfaces No. 12 to 14
Rear Focus Group (IV):
Surfaces No. 15 to 25
Nr.
Radius
Distance
nd
nv
1
∞
0.000
2
− 290.07000
4.000
1.48751
70.40
3
50.11900
16.200
4
−122.32000
7.500
1.75528
27.58
5
−70.79500
11.700
6
−52.70800
4.100
1.65416
39.63
7
−658.79000
1.300
8
434.01000
18.000
1.52875
76.97
9
−60.43000
0.300
10
78.86300
15.400
1.49702
81.54
11
−196.68000
10.361
12
46.63900
16.700
1.72005
43.69
13
−143.30000
4.000
1.65416
39.63
14
103.66000
1.000
15
92.48961
4.000
1.71743
29.62
16
31.62300
9.320
17
∞
7.000
18
−31.85100
4.000
1.67276
32.21
19
114.65000
3.560
20
−170.31000
7.300
1.74104
52.64
21
−47.31500
0.200
22
202.42000
7.500
1.52857
76.97
23
−74.45200
0.200
24
69.78300
10.400
1.49702
81.54
25
−82.93700
36.004
26
∞
0.000
Aspherical surface:
S15
Series constants:
A:
−1.132e−006
B:
4.950e−010
C:
−1.325e−013
D:
6.213e−016.
4. The objective lens of claim 3 , wherein said lens groups have the values:
Lens
f′(∞)/(1 − f′(e) *
Group
β(e)
f′(e)
β(e)/APF)
Δ/%
I
0.000
49.989
49.989
0.000
II
0.027
49.615
49.366
0.503
III
0.059
49.147
48.671
0.978
IV
0.142
47.834
47.010
1.753.
5. The objective lens of claim 1 , wherein said objective lens comprises three lens groups with a total of thirteen lenses, of which a fifth and a sixth, an eighth and a ninth, as well as a twelfth and a thirteenth lens configure a common surface having the following data:
Focal Length:
65.00 mm
Aperture Stop Area:
16
Front Focus Group (II):
Surfaces No. 7 to 10
Rear Focus Group (III):
Surfaces No. 11 to 26
Nr.
Radius
Distance
nd
nv
1
∞
2.551
2
554.31000
4.310
1.69901
30.13
3
82.93700
7.670
4
1539.90000
8.050
1.80527
25.42
5
−185.67000
4.670
1.81605
46.62
6
−188.36000
7.281
7
52.33000
16.110
1.61803
63.33
8
11548.00000
0.110
9
70.79500
4.200
1.71743
29.62
10
55.03300
2.534
11
42.47400
4.270
1.80527
25.42
12
35.48100
7.820
1.81605
46.62
13
46.63900
4.790
14
183.02000
4.200
1.55839
54.01
15
25.11900
9.800
16
∞
9.710
17
−23.04100
4.200
1.65416
39.63
18
39.52500
16.230
1.61803
63.33
19
−44.66800
0.350
20
66.47300
10.020
1.60303
65.44
21
−240.57000
0.210
22
466.39000
7.510
1.60303
65.44
23
−88.45271
0.100
24
91.72800
4.200
1.81605
46.62
25
27.98200
16.460
1.61803
63.33
26
−128.64000
39.014
28
∞
0.00
Aspherical surface:
S23
Series constants:
A:
2.316e−006
B:
1.036e−009
C:
−7.878e−013
D:
1.079e−015.
6. The objective lens of claim 5 , wherein said groups have the values:
Lens
f′(∞)/(1 − f′(e) *
Group
β(e)
f′(e)
β(e)/APF)
Δ/%
I
0.000
65.000
65.000
0.000
II
0.074
64.523
64.169
0.551
III
0.125
64.216
63.612
0.950.
7. The objective lens of claim 1 , wherein said objective lens comprises four lens groups with a total of twelve lenses, wherein a second and a third, a sixth and a seventh, as well as a ninth and a tenth lens configure a common surface having the following data:
Focal Length:
74.98 mm
Aperture Stop Area:
14
Front Focus Group (III):
Surfaces No. 11 to 13
Rear Focus Group (IV):
Surfaces No. 14 to 23
Nr.
Radius
Distance
nd
nv
1
∞
0.000
2
−755.31000
7.800
1.51635
64.14
3
74.45200
11.000
4
−446.68000
4.500
1.51682
64.17
5
68.78600
15.100
1.62017
63.48
6
−403.88000
5.760
7
103.66000
14.000
1.43876
94.99
8
−233.75000
5.410
9
67.80300
12.900
1.49702
81.54
10
453.16000
16.753
11
70.79500
11.850
1.71705
47.93
12
−202.42000
11.500
1.65416
39.63
13
81.75200
6.413
14
∞
2.670
15
−260.53296
3.600
1.71743
29.51
16
37.04700
8.900
17
−35.22700
3.600
1.61664
36.63
18
52.70800
10.200
1.78805
47.37
19
−53.08800
0.200
20
−202.4200
5.700
1.81605
46.62
21
−63.09600
0.200
22
50.11900
7.000
1.49702
81.54
23
1295.70000
36.153
24
∞
0.000
Aspherical surface:
S15
Series constants:
A:
3.750e−006
B:
3.704e−010
C:
−5.545e−013
D:
0.000e+000.
8. The objective lens of claim 7 , wherein said groups have the values:
Lens
f′(∞)/(1 − f′(e) *
Group
β(e)
f′(e)
β(e)/APF)
Δ/%
I
0.000
74.985
74.985
0.000
II
0.015
74.599
74.237
0.488
III
0.040
73.940
73.086
1.169
IV
0.112
71.926
70.051
2.677.
9. The objective lens of claim 1 , wherein said objective lens comprises four lens groups with a total of twelve lenses, of which a seventh and an eighth, as well as a tenth and an eleventh lens configure a common surface having the following data:
Focal Length:
99.80 mm
Aperture Stop Area:
14
Front Focus Group (III):
Surfaces No. 10 to 13
Rear Focus Group (IV):
Surfaces No. 14 to 22
Nr.
Radius
Distance
nd
Nv
1
∞
0.000
2
−1883.60000
4.700
1.54075
47.23
3
101.45000
3.140
4
127.72000
15.680
1.61803
63.33
5
−281.84000
0.200
6
66.35500
14.780
1.43876
94.99
7
202.42000
0.100
8
113.83000
4.850
1.80527
25.42
9
89.12500
14.959
10
52.33000
14.190
1.75704
47.82
11
381.29000
7.540
12
−230.02127
2.800
1.61344
44.29
13
29.64000
16.343
14
∞
18.938
15
−27.58200
2.970
1.61344
44.29
16
285.92000
12.520
1.69104
54.82
17
−41.86700
0.550
18
188.36000
8.180
1.69104
54.82
19
−76.07600
0.100
20
110.60000
10.690
1.60303
65.44
21
−46.30500
2.800
1.65416
39.63
22
153.99000
1.000
23
73.91800
4.220
1.49702
81.54
24
158.49000
40.123
25
∞
0.0
Aspherical surface:
S12
Series constants:
A:
8.669e−007
B:
9.230e−011
C:
2.783e−014
D:
−9.209e−016
E:
1.576e−018
F:
−8.587e−022.
10. The objective lens of claim 9 , wherein said groups have the values:
Lens
f′(∞)/(1 − f′(e) *
Group
β(e)
f′(e)
β(e)/APF)
Δ/%
I
0.000
99.797
99.797
0.000
II
0.019
98.880
98.652
0.231
III
0.062
97.122
96.209
0.950
IV
0.114
95.399
93.311
2.238.
11. The objective lens of claim 1 , wherein said iris diaphragm is arranged within a second lens group of said objective lens.
12. The objective lens of claim 11 , wherein said second lens group is adapted to be moved together with said iris diaphragm.
13. The objective lens of claim 11 , wherein the second lens group is rigidly connected to said housing.
14. The objective lens of claim 1 , wherein said iris diaphragm is arranged in front of a second lens group of said objective lens.
15. The objective lens of claim 14 , wherein said second lens group is adapted to be moved together with said iris diaphragm.
16. The objective lens of claim 14 , wherein the second lens group is rigidly connected to said housing.