Synthetic diamond coated electrodes and filaments

An electrical device comprising:

• a) a housing defined by a support and a light transmitting wall portion defining an enclosure with said support,
• b) an electrode secured to said support and having a core made of electrically conducting material, said electrode core being operable to be resistively heated and generate radiant energy when electrical energy is passed therethrough,
• c) a synthetic diamond material coating said core of said electrode,
• d) input means for electrical energy secured to said support and connected to said core to permit electrical energy received thereby to be passed to said core,
• e) said synthetic diamond material being operable to receive and transmit said radiant energy from said core to the volume defined by said enclosure and through said light transmitting wall portion of said housing,
• f) said coating of said synthetic diamond material also serving to protect said core from corrosion and evaporation of the material thereof during the electrical energization of said electrical device.

An electrical device comprising in combination:

• a) a support,
• b) a plurality of electrical terminal means supported by said support,
• c) a thin sheet-like envelope secured to said support and defining an enclosed volume void of air,
• d) electrical insulating material secured to said support
• e) a plurality of metal filament supports secured to said support and said insulating material which insulates the filament supports from each other, said electrical terminal means being respectively electrically connected to respective said filament supports,
• f) said electrical terminal means extending into the air evacuated volume defined by the assembly of said envelope and said support,
• g) a length of resistence filament material supported by said metal filament supports,
• h) a layer of synthetic diamond material secured to and defining a protective coating on said length of resistance filament material,
• i) said synthetic diamond material being transparent to radiant energy generated when said length of resistence filament material is electrically energized and being operable to protect said length of resistance filament material from erosion and heat corrosion.