Patent ID: 8344608
Filing Date: 2013-01-01
Classification: H01J

Abstract:
1. A hot cathode fluorescent lamp, comprising: a tube including opposite ends of the tube; a pair of substantially parallel lead wires arranged at each end of the tube; a coiled filament having opposite end portions which are connected to the substantially parallel lead wires, respectively; and an emitter located on the coiled filament, wherein the coiled filament has two long pitched regions in which a coil pitch of the coiled filament in the two long pitched regions is greater than the coil pitch of the coiled filament located in regions outside of the two long pitched regions, a continuous region of the coiled filament located between the two long pitched regions includes the emitter, and an entirety of the coiled filament other than the continuous region between the two long pitched regions does not include the emitter.