Optical system
First Claim
1. An optical system projecting onto an image plane an object that is disposed at infinity by an intermediate image, said optical system comprising:
- a front group and a relay optic, each including a plurality of lenses, said intermediate image disposed between said front group and said relay optic;
said optical system being configured as the object lying at infinity with at least two switchable and/or zoomable fields of view, said fields of view being imaged into said image planet;
said front group including at least three lenses successively disposed towards said image plane;
a first one of said lenses comprising of Ge;
at least a second of said lenses comprising of ZnSe; and
at least a third of said lenses comprising of either MgF2, CaF2 or MgO,wherein the front group includes a fourth lens, said fourth lens being a meniscus lens disposed adjacent to said third lens and nearer to said image plane.
1 Assignment
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Accused Products
Abstract
An optical system projecting onto an image plane an object that is disposed at infinity by an intermediate image. The optical system includes a front group and a relay optic, each including a plurality of lenses, the intermediate image disposed between the front group and the relay optic. The optical system being configured as the object lying at infinity with at least two switchable and/or zoomable fields of view, the fields of view being imaged into the image plane. The front group including at least three lenses successively disposed towards the image plane. A first one of the lenses including of Ge, at least a second of the lenses including of ZnSe, and at least a third of the lenses including of either MgF2, CaF2 or MgO.
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Citations
11 Claims
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1. An optical system projecting onto an image plane an object that is disposed at infinity by an intermediate image, said optical system comprising:
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a front group and a relay optic, each including a plurality of lenses, said intermediate image disposed between said front group and said relay optic; said optical system being configured as the object lying at infinity with at least two switchable and/or zoomable fields of view, said fields of view being imaged into said image planet; said front group including at least three lenses successively disposed towards said image plane; a first one of said lenses comprising of Ge; at least a second of said lenses comprising of ZnSe; and at least a third of said lenses comprising of either MgF2, CaF2 or MgO, wherein the front group includes a fourth lens, said fourth lens being a meniscus lens disposed adjacent to said third lens and nearer to said image plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification