Reflector telescope with upright image
AssigneeJos Schneider Ptiische Werke Kreuznach GmbH & Co KG
InventorWolfgang Schroder
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Abstract
A reflector telescope with upright image having a principal mirror constructed as a concave mirror, wherein in the path of the light rays between the principal mirror and a concave reversing mirror a collector mirror and a folding mirror are arranged, so that in addition foldings occur at the principal mirror and the reversing mirror of a reflector telescope of the Gregorian type. The image ray path in the reflector telescope is folded twice between the concave principal mirror and the reversing mirror as well as twice between the reversing mirror and the principal mirror. Thereby an extraordinarily compact configuration of the light ray path is achieved and as a result a reflector telescope with reduced overall dimensions, reduced weight and diminished type-conditioned image aberrations is created.
Claims18
A reflector telescope with an upright image, comprising:
- an annular concave mirror oriented along an optical axis of the telescope and receiving light rays from an object;
- a collector mirror positioned along said optical axis between said concave mirror and an entrance opening of said telescope for receiving light rays reflected from said concave mirror, said collector mirror being inclined to said optical axis for directing rays reflected therefrom to one side of the telescope;
- a folding mirror at least one side of said telescope positioned to receive rays reflected from said collector mirror and inclined to said optical axis such that a bundle of rays reflected from said folding mirror are trained upon an opposite side of the telescope and said bundle is centered on a folding axis extending perpendicularly to said optical axis but laterally offset therefrom;
- a concave reversing mirror on said opposite side of the telescope positioned to receive said bundle and reflect rays therefrom convergingly to said folding mirror and thence to said collector mirror, whereby said collector mirror reflects the latter rays along said optical axis through said annular concave mirror;
- and
- an ocular disposed along said optical axis behind said annular concave mirror for viewing of a real upright image of said object.
Dependencies are inferred from the claim text.