Abstract: A visual has a multilayer ceramic substrate (1) with an emission layer (2) on its front face. The substrate is mounted on carrier (4) with a L-shaped cross-section, via the foot (41) of the L. A glass face plate (5) is on the top of the main limb (42) of the L. The face plate has a phosphor layer (6) on its inside surface. A succession (7) of vias and interconnects in the L provides connection from the substrate (1) to the phosphor layer. A band (8) of frit is screen printed onto the inside of the face plate, peripherally of phosphor layer. In a corresponding position on the top of the main limb, a groove (9) is formed. On assembly of the face plate to the carrier, the frit (8) fits into the groove (9). The face plate abuts the top of the limb (42), thereby defining the separation of the face plate and the emission substrate.

Abstract: The lamp consists of a hollow tubular body 1 with a closed end 2 and an open end 3. The body is of sintered ceramic material. A window 4 is sealed across the open end, the window and the body being united by a layer of frit 5. The window is of sapphire. Within the body is sealed an inert gas atmosphere 6 and a pellet charge of excitable material 7. In use, the lamp is subjected to RF electromagnetic radiation which heats it to 1000° C. causes it to emit visible light via the sapphire.

Abstract: The lamp consists of a hollow tubular body 1 with a closed end 2 and an open end 3. The body is of sintered ceramic material. A window 4 is sealed across the open end, the window and the body being united by a layer of frit 5. The window is of sapphire. Within the body is sealed an inert gas atmosphere 6 and a pellet charge of excitable material 7. In use, the lamp is subjected to RF electromagnetic radiation which heats it to 1000° C. causes it to emit visible light via the sapphire.