Patent Number: 
Section: claims

1. A sight device, in particular a reflector sight or telescopic sight, which comprises a lighting apparatus for generating or illuminating a target mark,wherein the lighting apparatus comprises a light guide made of photoluminescent, in particular fluorescent material and a radioluminescent light source coupled to the light guide,wherein the light guide is designed to receive both the light produced by the radioluminescent light source as well as ambient light,wherein the light guide is configured to receive the ambient light along at least a section of a longitudinal extension of the light guide and to convert the ambient light into photoluminescent light,wherein the absorption spectrum of the photoluminescent material of the light guide and the emission spectrum of the radioluminescent light source in the visible range can both comprise a spectral bandwidth and a center wavelength,wherein the center wavelength of the emission spectrum of the radioluminescent light source is greater than the center wavelength of the absorption spectrum of the photoluminescent material of the light guide, andwherein the radioluminescent light source is covered by an opaque coating which reflects the light produced by the radioluminescent light source back to the radioluminescent light source, and the opaque coating is applied onto a surface of the radioluminescent light source. 2. The sight device as claimed in claim 1, wherein the center wavelength of the emission spectrum of the radioluminescent light source is at least 30 nm, preferably at least 50 nm, greater than the center wavelength of the absorption spectrum of the photoluminescent material of the light guide. 3. The sight device as claimed in claim 1, wherein the spectral bandwidth of the emission spectrum of the radioluminescent light source and the spectral bandwidth of the absorption spectrum of the photoluminescent material of the light guide each amounts to at most 100 nm, preferably at most 80 nm. 4. The sight device as claimed in claim 1, wherein the spectral bandwidth of the emission spectrum of the radioluminescent light source and the spectral bandwidth of the absorption spectrum of the photoluminescent material of the light guide do not overlap. 5. The sight device as claimed in claim 1, wherein in the visible range at most 30%, preferably at most 20%, of the emission spectrum of the radioluminescent light source overlaps with the absorption spectrum of the photoluminescent material of the light guide. 6. The sight device as claimed in claim 1, wherein in the visible range at least 50%, preferably at least 70%, of the emission spectrum of the radioluminescent light source overlaps with the emission spectrum of the photoluminescent material of the light guide. 7. The sight device as claimed in claim 1, wherein the emission spectrum of the radioluminescent light source is in the green and/or yellow wavelength range. 8. The sight device as claimed in claim 1, wherein the emission spectrum of the photoluminescent material of the light guide is in the green wavelength range. 9. The sight device as claimed in claim 1, wherein the radioluminescent light source is arranged at an end side of the light guide, whereby light of the radioluminescent light source is directed through the end side into the light guide. 10. The sight device as claimed in claim 9, wherein the end side of the light guide is adhered by means of a transparent adhesive to the radioluminescent light source. 11. The sight device as claimed in claim 9, wherein the radioluminescent light source has a longitudinal extension which is perpendicular to the axis of the light guide in its end section. 12. The sight device as claimed in claim 9, wherein the end side of the light guide facing the radioluminescent light source is a polished surface. 13. The sight device as claimed in claim 1, further comprising a reverse prism, preferably a Schmidt-Pechan prism, arranged in the beam path,wherein the end side of the light guide, which faces away from the radioluminescent light source, is aligned to an in particular circular opening in a mirrored plane surface of the reverse prism (12). 14. The sight device as claimed in claim 1, wherein the end side of the light guide facing away from the radioluminescent light source is a polished surface, which preferably faces a prism for directing the light into a beam path of the sight device. 15. The sight device as claimed in claim 1, wherein the opaque coating has a white color. 16. The sight device as claimed in claim 1, wherein the radioluminescent light source and an end section of the light guide bordering the radioluminescent light source are surrounded by a housing essentially in a form-fitting manner. 17. The sight device as claimed in claim 16, wherein the housing is made in two parts, wherein preferably the two parts can be pivoted relative to one another or can be held together by means of a snap device. 18. The sight device as claimed in claim 16, wherein the housing comprises at least one opening, which leads from the outside to the coupling point between the radioluminescent light source and the light guide, in particular for introducing an adhesive. 19. The sight device as claimed in claim 16, wherein in the housing at least one screw sits in a screw thread, via which the radioluminescent light source and/or an end section of the light guide bordering the radioluminescent light source is/are clamped. 20. The sight device as claimed in claim 1, wherein the radioluminescent light source and an end section of the light guide bordering the radioluminescent light source are surrounded by an in particular T-shaped shrink tube. 21. The sight device as claimed in claim 1, wherein the radioluminescent light source together with an end section of the light guide bordering the radioluminescent light source is molded into a material. 22. The sight device as claimed in claim 1, wherein the opaque coating has a color pigmented with TiO2.