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US 5,541,480 AGranted
High-pressure discharge lamp with metal layer on outer surface
AssigneeU.S. Philips Corporation
InventorsMax L. P. Renardus, Henricus P. M. Gubbels, Raghu Ramaiah
Life of this patent
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Abstract
The invention relates to a high-pressure discharge lamp provided with a discharge vessel with a ceramic wall which has an outer surface on which a metallic coating is present. According to the invention, the coating is a metal layer sintered on the ceramic wall, which sintering process takes place during sintering of the discharge vessel so as to achieve translucence.
Claims14
A high-pressure discharge lamp, comprising:
- a discharge vessel with a ceramic wall which has an outer surface, the outer surface having a crystal size and pore distribution;
- and
- a metal layer sintered on and having a sintered bond with the outer surface of the ceramic wall, the metal layer having a particle size and pore distribution comparable to the crystal size and pore distribution of the outer surface of the ceramic wall at the location of the metal layer, and the crystal size and pore distribution of the outer surface of the ceramic wall being different at the location of the metal layer than at portions not having the metal layer.
A high pressure discharge lamp, comprising:
- a discharge vessel with a ceramic wall having an outer surface, the outer surface having a crystal size and pore distribution;
- and
- a metal layer sintered on the outer surface of said ceramic wall, said sintered metal layer being formed by (i) applying a paste comprised of a mixture of metal powder and a solvent to the ceramic discharge vessel in a previously baked molded state of the discharge vessel in which only initial sintering growth between ceramic powder particles of the discharge vessel exists, and (ii) sintering the discharge vessel with said paste thereon to achieve translucence of the ceramic discharge vessel and a sintered bond of said metal layer with said outer surface, said metal layer having a particle size and pore distribution comparable to the crystal size and pore distribution of the outer surface of the ceramic wall at the location of the metal layer, and the crystal size and pore distribution of the outer surface of the ceramic wall being different at the location of the metal layer than at portions not having the metal layer.
Dependencies are inferred from the claim text.