Abstract: The electrode mount includes a filament coil, paired lead wires supporting the filament coil therebetween in a manner that the filament coil hangs across the lead wires; and bead glass retaining the paired leadwires. The arc tube includes an arc tube main body formed by winding a glass tube, and an electrode fixed to the end portion of the arc tube main body. For this electrode, the electrode mount is used. The fixing of the electrode mount at the end portion of the arc tube main body is made at a region of the lead wires positioned between the filament coil and the bead glass, and the bead glass is disposed outside the arc tube main body.

Abstract: It is possible to obtain electrodes 15 and 16 for a discharge lamp which are compact and have a large packing capacity for electron emitting material if an electrode for a discharge lamp is structured to include a quadruple coil 50 which is made by performing a first winding of a filament 41 to make a single coil 44, performing a secondary winding of the single coil 44 to make a double coil 46, performing a tertiary winding of the double coil 46 to make a triple coil 48 and performing a quaternary winding of the triple coil 48, and, in the quadruple coil 50, at least a hollow space 47? surrounded by the tertiary winding is structured to be packed with electron emitting material.

Abstract: The electrode mount includes a filament coil, paired lead wires supporting the filament coil therebetween in a manner that the filament coil hangs across the lead wires; and bead glass retaining the paired leadwires. The arc tube includes an arc tube main body formed by winding a glass tube, and an electrode fixed to the end portion of the arc tube main body. For this electrode, the electrode mount is used. The fixing of the electrode mount at the end portion of the arc tube main body is made at a region of the lead wires positioned between the filament coil and the bead glass, and the bead glass is disposed outside the arc tube main body.