Back to results
US 5,668,671 AGranted
Dioptric lens system
AssigneeBritish Aerospace Public Limited Company
InventorMatthias Erdmann
Life of this patent
Estimating the term…
Abstract
A dioptric lens system comprises a plurality of lenses and a rear diaphragm functioning as an aperture diaphragm. An overall length in the order of the focal distance is obtained by the features that the object side surface of the object side lens comprises an aspherical component and that the intermediate and image side lenses are closely adjacent.
Claims21
A dioptric lens system comprising
- an object side lens having a positive refractive power and an aspherical object side surface,
- an intermediate dispersing lens,
- a first spacing between said object side lens and said intermediate lens,
- an image side lens having a positive refractive power,
- a second spacing between said image side lens and said intermediate lens, said second spacing being substantially smaller than said first spacing, and
- a rear diaphragm constituting an exit pupil of said lens system,
- wherein a real image is formed behind the rear diaphragm.
4 more elements
A dioptric lens system comprising:
- an object side lens having a positive refractive power and an aspherical object side surface,
- an intermediate dispersing lens,
- a first spacing between said object side lens and said intermediate lens,
- an image side lens having a positive refractive power,
- a second spacing between said image side lens and said intermediate lens, said second spacing being substantially smaller than said first spacing, and
- a rear diaphragm constituting an exit pupil of said lens system,
- the lens system having the following lens data:
- ______________________________________ radius thickness material ______________________________________ object:
- infinite infinite 1:
- 43.387 5.50 silicon 2:
- 53.206 25.15 3:
- 38.154 2.40 germanium 4:
- 25.716 1.54 5:
- 38.206 3.00 silicon 6:
- 63.747 2.41 7:
- infinite 1.00 germanium 8:
- infinite 2.50 9:
- infinite 1.00 sapphire 10:
- infinite 1.50 11:
- infinite 34.90 12:
- infinite 0.10 silicon 13:
- infinite 0.00 image infinite 0.00 Asphere:
- K:
- -0.083265 A:
- 0.442096E - 07 B:
- 0.000000E + 00 C:
- 0.409682E - 13 D:
- -.319450E - 17. ______________________________________
25 more elements
A dioptric lens system comprising:
- an object side lens having a positive refractive power and an aspherical object side surface,
- an intermediate dispersing lens,
- a first spacing between said object side lens and said intermediate lens,
- an image side lens having a positive refractive power,
- a second spacing between said image side lens and said intermediate lens, said second spacing being substantially smaller than said first spacing, and
- a rear diaphragm constituting an exit pupil of said lens system,
- the lens system having the following lens data:
- ______________________________________ radius thickness material ______________________________________ object:
- infinite infinite 1:
- 45.319 5.50 silicon 2:
- 58.156 22.73 3:
- 32.866 2.40 germanium 4:
- 24.732 4.08 5:
- 58.030 3.00 silicon 6:
- 91.603 2.49 7:
- infinite 1.00 germanium 8:
- infinite 2.30 9:
- infinite 1.00 sapphire 10:
- infinite 1.50 11:
- infinite 34.90 12:
- infinite 0.10 silicon 13:
- infinite 0.00 image infinite 0.00 Asphere:
- K:
- -0.083265. ______________________________________
21 more elements
A dioptric lens system comprising:
- an object side lens having a positive refractive power and an aspherical object side surface,
- an intermediate spacing between said object side lens and said intermediate lens,
- a first spacing between said object side lens and said intermediate lens,
- an image side lens having a positive refractive power,
- a second spacing between said image side lens and said intermediate lens, said second spacing being substantially smaller than said first spacing, and
- a rear diaphragm constituting an exit pupil of said lens system,
- the lens system having the following lens data:
- ______________________________________ radius thickness material ______________________________________ object:
- infinite infinite 1:
- 38.595 6.50 silicon 2:
- 45.996 19.14 3:
- 32.468 2.40 germanium 4:
- 22.430 3.31 5:
- 35.465 4.00 zinc selenide 6:
- 87.485 3.10 7:
- infinite 1.00 germanium 8:
- infinite 2.50 9:
- infinite 1.00 sapphire 10:
- infinite 1.50 11:
- infinite 34.90 12:
- infinite 0.10 silicon 13:
- infinite 0.00 image infinite 0.00 Asphere:
- K:
- -0.053620 A:
- -.161285E - 07 B:
- -.222806E - 12 C:
- 0.0000000E + 00 D:
- 0.000000E + 00. ______________________________________
25 more elements
A dioptric lens system comprising:
- an object side lens having a positive refractive power and an aspherical object side surface,
- an intermediate dispersing lens,
- a first spacing between said object side lens and said intermediate lens,
- an image side lens having a positive refractive power,
- a second spacing between said image side lens and said intermediate lens, said second spacing being substantially smaller than said first spacing, and
- a rear diaphragm constituting an exit pupil of said lens system,
- the lens system having the following lens data:
- ______________________________________ radius thickness material ______________________________________ object:
- infinite infinite 1:
- 52.243 9.00 silicon 2:
- 80.920 15.30 3:
- 35.787 3.00 germanium 4:
- 24.861 11.45 5:
- -40.664 3.80 germanium 6:
- -50.728 2.56 7:
- 724.569 3.90 silicon 8:
- -117.672 4.00 9:
- infinite 1.00 germanium 10:
- infinite 1.00 11:
- infinite 1.00 sapphire 12:
- infinite 1.00 13:
- infinite 35.00 image infinite 0.00 Asphere:
- K:
- -0.186374. ______________________________________
21 more elements
Dependencies are inferred from the claim text.