Modular infrared kepler telescope
First Claim
1. An afocal optical system defining an intermediate image plane and a real exit pupil, the afocal optical system comprising:
- an objective having a focal length and defining an optical axis;
said objective having a structural length and being configured as a telesystem including a positive front group and a negative rear group;
said positive front group and said negative rear group conjointly defining a telefactor (TF) of less than 0.7 wherein said telefactor is the ratio of said structural length of said objective to said focal length thereof;
an ocular defining a focal length and including at least two lenses arranged on said optical axis;
said image plane and said real exit pupil defining a distance therebetween and said distance being greater than said focal length of said ocular by a factor of at least 1.3; and
, a plurality of lenses arranged in front of said negative rear group and being exchangeable for changing the magnification of said system.
3 Assignments
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Accused Products
Abstract
The invention is directed to an infrared Kepler telescope which includes an objective defining an optical axis and including a positive front group and a negative rear group all arranged on the optical axis. The objective further includes an interchangeable optic interposed between the positive front group and the negative rear group with the interchangeable optic being configured to operate as a magnification changer. An ocular is mounted on the optical axis rearward of the negative rear group and the rear group and the ocular are fixedly pregiven. The positive front group is a first positive front group and is exchangeable with at least a second positive front group. The interchangeable optic is a first interchangeable optic and is exchangeable with at least a second interchangeable optic. The first and second positive front groups are optically so configured that each one of the positive front groups undercorrects spherical aberration and coma forward of the negative rear group to the same extent with or without the interchangeable optic. It is also provided that each combination has an overall diffraction-limited correction except for the distortion. The interchangeable optics (W11, W21) generate a second field of view. The telescope having interchangeable optics (W11, W21) has a negative distortion and has a positive distortion without these interchangeable optics.
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Citations
31 Claims
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1. An afocal optical system defining an intermediate image plane and a real exit pupil, the afocal optical system comprising:
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an objective having a focal length and defining an optical axis;
said objective having a structural length and being configured as a telesystem including a positive front group and a negative rear group;
said positive front group and said negative rear group conjointly defining a telefactor (TF) of less than 0.7 wherein said telefactor is the ratio of said structural length of said objective to said focal length thereof;
an ocular defining a focal length and including at least two lenses arranged on said optical axis;
said image plane and said real exit pupil defining a distance therebetween and said distance being greater than said focal length of said ocular by a factor of at least 1.3; and
,a plurality of lenses arranged in front of said negative rear group and being exchangeable for changing the magnification of said system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification