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US 6,270,237 B1Granted
Electric lamp with an anti-reflecting layer
AssigneeU.S. Philips Corporation
InventorKlaus Scholler
Life of this patent
Estimating the term…
Abstract
A lamp has a metal layer to prevent light escaping in an undesired direction. A sealed envelope wall encloses an interior space in which an electrical element is arranged. The wall is partly coated by the metal layer, preferably at a lamp end opposite a lamp cap. A light diffusing or absorbing layer over a side of the metal layer facing the interior space prevents light reflection back into the interior space. For use as a vehicle headlamp, the metal layer may be silvery as viewed from the outside so that it is not noticeable.
Claims11
An electric lamp comprising:
- a lamp vessel closed in a vacuumtight manner and having a wall enclosing an interior space;
- an electric element arranged in the interior space of the lamp vessel;
- a metal layer provided on a portion of said wall of the lamp vessel, and having a side facing the interior space;
- and
- means for preventing light reflection from said metal layer, said means being located at said side of said metal layer facing the interior space.
2 more elements
An electric lamp comprising:
- a lamp vessel closed in a vacuumtight manner and having a wall enclosing an interior space;
- an electric element arranged in the interior space of the lamp vessel;
- and
- a metal layer provided on a portion of said wall of the lamp vessel, and having a side facing the interior space, wherein at least a portion of said side of said metal layer facing the interior space is configured to be a non-reflecting surface.
1 more element
An electric lamp comprising:
- a lamp vessel closed in a vacuumtight manner and having a wall enclosing an interior space;
- an electric element arranged in the interior space of the lamp vessel;
- a metal layer provided on a portion of said wall of the lamp vessel, and having a side facing the interior space;
- and
- a coating formed on at least a portion of said side of said metal layer facing the interior space, said coating preventing light reflection from said metal layer.
2 more elements
Dependencies are inferred from the claim text.