Lighting unit having a plurality of curved surface elements

1. Lighting unit comprising:

at least one light source;

at least one light guide following and at least regionally surrounding the source, said light guide including at least one light exit surface facing away from the source and centrally located at least approximately, surrounded by at least one externally located light exit surface, wherein

said at least one externally located light exit surface comprises a plurality of surface elements adjoining each other with or without offset, and

said surface elements are surface regions of curved solids;

said light guide including an envelope which is rotationally symmetrical with respect to an optical axis and wherein a diameter of a central light emitting surface is about 40% of the diameter of the light grid.

2. Lighting unit according to claim 1 , wherein the light source is a lighting diode.

3. Lighting unit according to claim 1 , wherein the single curved solid is an ellipsoid.

4. Lighting unit according to claim 1 , wherein the surface elements are Cartesianally arranged.

5. Lighting unit according to claim 1 , wherein all surface elements are like surface regions of the identical curved solid.

6. Lighting unit according to claim 1 , wherein a central light exit surface includes an optical lens.

7. Lighting unit according to claim 1 , wherein the central light exit surface comprises a plurality of surface elements adjacent to each other, which are surface regions of curved solids.

8. Lighting unit according to claim 1 , wherein the light guide includes a truncated paraboloid.

9. Lighting unit comprising:

at least one light source;

at least one light guide following and at least regionally surrounding the source, said light guide including at least one light exit surface facing away from the source, and centrally located at least approximately surrounded by at least one externally located light exit surface, wherein said at least one externally located light exit surface comprises a plurality of surface elements Cartesianally arranged and adjoining each other with or without offset, and said surface elements are surface regions of curved solids.

10. Lighting unit comprising:

at least one light source;

at least one light guide following and at least regionally surrounding the source, said light guide including at least one light exit surface facing away from the source, and centrally located at least approximately surrounded by at least one externally located light exit surface, wherein said at least one externally located light exit surface comprises a plurality of surface elements adjoining each other with or without offset, and said surface elements are like surface regions of identical curved solids.

11. Lighting unit comprising:

at least one light source;

at least one light guide following and at least regionally surrounding the source, said light guide including at least one light exit surface facing away from the source, and centrally located at least approximately surrounded by at least one externally located light exit surface, wherein said at least one externally located light exit surface comprises a plurality of surface elements adjoining each other with or without offset, and said surface elements are surface regions of curved solids.

12. Lighting unit comprising:

at least one light source;

at least one light guide following and at least regionally surrounding the source, said light guide including at least one light exit surface facing away from the source and centrally located at least approximately and includes at least one optical lens, surrounded by at least one externally located light exit surface, wherein said at least one externally located light exit surface comprises a plurality of surface elements adjoining each other with or without offset, and said surface elements are surface regions of curved solids.

13. Lighting unit comprising:

at least one light source;

at least one light guide following and at least regionally surrounding the source, said light guide including at least one light exit surface facing away from the source, and centrally located at least approximately, surrounded by at least one externally located light exit surface, wherein said at least one externally located light exit surface comprises a plurality of surface elements adjoining each other with or without offset, and said surface elements are surface regions of curved solids, wherein said light guide includes an envelope which is rotationally symmetrical with respect to the optical axis and a diameter of a central light-emitting surface of said light guide is 40 percent of the diameter of the light guide.

14. Lighting unit comprising:

at least one tight source;

at least one light guide following and at least regionally surrounding the source, said light guide including a truncated paraboloid, at least one light exit surface facing away from the source, and centrally located at least approximately surrounded by at least one externally located light exit surface, wherein said at least one externally located light exit surface comprises a plurality of surface elements adjoining each other with or without offset, and said surface elements are surface regions of curved solids.

15. Lighting unit comprising:

at least one light source;

at least one light guide following and at least regionally surrounding the source, said light guide including at least one light exit surface facing away from the source, wherein said light exit surface is centrally located at least approximately, and said light exit surface is arranged approximately normal to an optical axis of said light source; and

at least one externally located light exit surface surrounding said light guide, wherein said at least one externally located light exit surface comprises a plurality of surface elements adjoining each other with or without offset, and each surface elements is an ellipsoid.