The invention in particular relates to an oven illumination (4) for illuminating the interior of a muffle (1) of an oven. Inter alia for improving lifetimes of light sources (6) of the oven illumination (4), a glass lens (7) arranged downstream the at least one light source (6) is provided. The glas
The invention in particular relates to an oven illumination (4) for illuminating the interior of a muffle (1) of an oven. Inter alia for improving lifetimes of light sources (6) of the oven illumination (4), a glass lens (7) arranged downstream the at least one light source (6) is provided. The glass lens (7) comprises a cavity (8) at least reducing heat conduction towards the at least one light source (6).
대표청구항▼
1. An oven illumination for illuminating the interior of a muffle of an oven, comprising at least one light source and a lens, wherein the lens comprises a closed hollow cavity, the closed hollow cavity has a continuous boundary formed by the lens, the continuous boundary is completely sealed within
1. An oven illumination for illuminating the interior of a muffle of an oven, comprising at least one light source and a lens, wherein the lens comprises a closed hollow cavity, the closed hollow cavity has a continuous boundary formed by the lens, the continuous boundary is completely sealed within the lens, and wherein the lens is arranged downstream of the at least one light source for at least reducing heat conduction towards the at least one light source, wherein the lens comprises a front face for facing the muffle and a rear face for facing the light source, the closed hollow cavity is between the front face and the rear face, and the front face, the rear face, and the closed hollow cavity are arranged downstream of the at least one light source. 2. The oven illumination according to claim 1, wherein the at least one light source is a light emitting diode. 3. The oven illumination according to claim 1, wherein the closed hollow cavity is filled with a gaseous or liquid medium for increasing a thermal resistance across the lens. 4. The oven illumination according to claim 1, wherein the gaseous or liquid medium influences illumination properties of the at least one light source. 5. The oven illumination according to claim 1, wherein the closed hollow cavity is evacuated for increasing a thermal resistance across the lens. 6. The oven illumination according to claim 1, wherein at least a surface of the lens is provided with a transparent heat protection coating. 7. The oven illumination according to claim 1, wherein the oven comprises at least one of active cooling elements and a heat sink for removing heat from the at least one oven illumination. 8. The oven illumination according to claim 7, wherein the oven comprises a housing and parts of the oven housing serve as heat sink. 9. The oven illumination according to claim 1, wherein at least a portion of the lens protrudes into the muffle of the oven. 10. The oven illumination according to claim 1, wherein the closed hollow cavity is filled with inert gas for increasing a thermal resistance across the lens. 11. The oven illumination according to claim 1, wherein the at least one light source is spaced apart from the lens and the closed cavity. 12. The oven illumination according to claim 1, wherein the oven comprises a recess or opening provided in a wall of the muffle for accommodating the oven illumination. 13. The oven illumination according to claim 1, wherein the lens comprises different sections for at least one of dispersing or directing light to or collecting light in preferred locations within the interior of the muffle. 14. The oven illumination according to claim 1, wherein the lens comprising the closed hollow cavity is a single optical element and wherein the single optical element is arranged downstream of the at least one light source. 15. The oven illumination according to claim 1, wherein the closed hollow cavity is filled with at least one of nitrogen, helium, neon, argon, and xenon for increasing a thermal resistance across the lens. 16. The oven illumination according to claim 1, wherein the closed hollow cavity is formed within the lens to conform to a shape of the lens, the shape being tubular. 17. The oven illumination of claim 1, wherein the closed hollow cavity comprises a majority of a volume of the lens. 18. An oven illumination for illuminating the interior of a muffle of an oven, comprising at least one light source and a lens, wherein the lens comprises a sealed hollow cavity, wherein the lens and the sealed hollow cavity are arranged downstream of the at least one light source, and wherein the lens is at least partially integrated in a recess or opening in a wall of the oven muffle such that at least a portion of the sealed hollow cavity is arranged between the at least one light source and the oven muffle for at least reducing heat conduction towards the at least one light source, wherein the lens comprises a front face for facing the muffle and a rear face for facing the light source, the sealed hollow cavity is between the front face and the rear face, and the front face, the rear face, and the sealed hollow cavity are arranged downstream of the at least one light source. 19. The oven illumination according to claim 18, wherein the lens has a tubular shape. 20. The oven illumination according to claim 19, wherein the sealed hollow cavity is formed within the lens to conform to the tubular shape of the lens. 21. The oven illumination according to claim 18, wherein the sealed hollow cavity has a continuous boundary formed by the lens, and wherein the continuous boundary is completely closed with the lens. 22. The oven illumination according to claim 21, wherein the lens has a tubular shape. 23. The oven illumination according to claim 22, wherein the continuous boundary formed by the lens conforms to the tubular shape of the lens.
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이 특허에 인용된 특허 (5)
Doni Fabrizio (Milan ITX) Ferrario Bruno (Milan ITX), Domestic oven observation window having a low temperature external surface.
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