Patent ID: 7714487
Filing Date: 2010-05-11
Classification: H01J

Abstract:
1. A discharge lamp comprising: an electrode including: a heater constituted of a coil portion and a first lead wire portion and a second lead wire portion that respectively connect the coil portion through a rear end of the coil portion, the heater having an electron emission material applied thereto; and scattering-prevention member, which is a cylindrical sleeve whose both ends are open, for covering surrounding of the coil portion, said both open ends respectively facing the forward end and the rear end of the coil portion; a sleeve lead wire, which is attached to said scattering prevention member at one end and to said heater at the other end; and a connection-reinforcing member that has a first connection member for connecting the first lead wire portion, and a second connection member for connecting the second lead wire portion, while the first and second connection members integrated with each other by means of a coupling portion are separated from each other by cutting the coupling portion, each of the first and second connection members being composed of L-shaped plate member, wherein the connection-reinforcing member is supported by any one of the first and second connection members; wherein in the electrode, the first lead wire portion is connected to a first lead-in wire and the second lead wire portion is connected to a second lead-in wire, said first and second lead-in wires being provided on two opposed ends of a glass tube in which a gas containing a light-emitting material is enclosed and to an interior of which fluorescent substance is coated; wherein the coil portion is arranged vertically along a tube axis of the glass tube; and wherein the coil portion is structured by a spiral wire with it being further wound spirally and without coming into contact therewith.