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An optical device forms a beam path between an optical end element at a beam path end and an object scene into which the beam path is directed via a field of view of the end element. The optical device contains an alignment device for pivoting the field of view relative to a predetermined direction,

An optical device forms a beam path between an optical end element at a beam path end and an object scene into which the beam path is directed via a field of view of the end element. The optical device contains an alignment device for pivoting the field of view relative to a predetermined direction, an end optical unit and an optical articulation for guiding the beam path from the pivoted field of view into the end optical unit. In order to achieve good shielding against spurious radiation, the device has a shielding unit containing a shielding element led partly around the optical articulation, which shielding unit shields the optical articulation against incident radiation that is not incident through the entrance or exit aperture of the optical articulation.

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1. An optical device for forming a beam path between an optical end element at a beam path end and an object scene into which the beam path is directed via a field of view of the optical end element, the optical device comprising: an end optical unit;an optical link for guiding a beam into the optic

1. An optical device for forming a beam path between an optical end element at a beam path end and an object scene into which the beam path is directed via a field of view of the optical end element, the optical device comprising: an end optical unit;an optical link for guiding a beam into the optical end element, said optical link having an entrance aperture and an exit aperture;an alignment device for pivoting said optical link for changing the field of view relative to a predetermined direction; anda shielding unit containing a shielding element leading partly around said optical link, said shielding unit shielding said optical link against incident radiation that is not incident through said entrance aperture or said exit aperture of said optical link. 2. The optical device according to claim 1, further comprising a pivoting element which concomitantly pivots with a pivoting of said optical link for changing the field of view, one side of said shielding element being coupled with a movement of said pivoting element and another side being mounted in a structurally fixed manner. 3. The optical device according to claim 1, further comprising: a pivoting element; andan input optical unit, said shielding element being mechanically forcibly coupled in terms of its movement with a movement of said input optical unit. 4. The optical device according to claim 1, wherein said shielding unit has at least one variation device and said shielding element is variable in terms of its shielding surface area, said variation device for generating a variation of the shielding surface area is coupled to a pivoting of said optical link. 5. The optical device according to claim 1, wherein said shielding unit has at least one unwinding device and said shielding element is unwound via said unwinding device. 6. The optical device according to claim 1, further comprising a surface dispenser, which is prepared for correspondingly issuing additional shielding surface of said shielding element when the field of view is pivoted. 7. The optical device according to claim 6, wherein said surface dispenser is a roll onto which said shielding element is partly wound up. 8. The optical device according to claim 1, wherein said shielding element is a film. 9. The optical device according to claim 1, wherein said shielding unit has a drive that drives a movement of said shielding element from a structurally fixed side of said shielding element. 10. The optical device according to claim 9, wherein said drive keeps said shielding element free of tension during the movement of said shielding element. 11. The optical device according to claim 9, wherein said shielding unit has an unwinding device, on which said shielding element is partly rolled up, and said drive drives a rotation of said unwinding device. 12. The optical device according to claim 9, further comprising an input optical unit and said drive is forcibly coupled with a movement of said input optical unit. 13. The optical device according to claim 9, wherein said drive has a gearwheel which meshes with a gearwheel concomitantly moved with said optical link. 14. The optical device according to claim 1, wherein said shielding element is mounted such that said shielding element is placed onto a support in a manner free of slipping when the field of view is pivoted. 15. The optical device according to claim 1, wherein said shielding unit has a frame leading around said optical link and further has an opening for leading the beam path through it, said shielding element is mounted such that said shielding element is placed onto said frame in a slip-free manner when said optical link is pivoted. 16. The optical device according to claim 1, wherein said optical link has a reversing prism with an entrance surface, an exit surface and a reflection surface, said shielding element being partly led both around said entrance surface and around said exit surface. 17. A homing head for a guided missile, the homing head comprising: an optical end element defining a field of view; andan optical device for forming a beam path between said optical end element at a beam path end and an object scene into which a beam is directed via said field of view of said optical end element, the optical device containing: an end optical unit;an optical link for guiding a beam into said optical end element, said optical link having an entrance aperture and an exit aperture;an alignment device for pivoting said optical link for changing the field of view relative to a predetermined direction;a shielding unit containing a shielding element leading partly around said optical link, said shielding unit shielding said optical link against incident radiation that is not incident through said entrance aperture or said exit aperture of said optical link.