Mercury-free discharge lamp

摘要

A mercury-free discharge lamp includes a luminous tube, and a pair of electrodes in the luminous tube such that the electrodes face each other in the luminous tube. The discharge lamp also includes a pair of thermal insulation films formed on an outer surface of the luminous tube around the electrodes, respectively. Zinc, halogen, and a noble gas are sealed in the luminous tube. A metal is also sealed in the luminous tube. The metal has a lower ionization energy than zinc. A ratio of a molar density of the metal to a molar density of zinc is 0.001 to 0.05. The mercury-free discharge lamp has a long life and can emit an ultraviolet beam in a short wavelength range (200-350 nm) at a high output and a high luminous efficacy without causing devitrification of the luminous tube.

主权项

1. A mercury-free discharge lamp comprising:
a luminous tube; a pair of electrodes in the luminous tube such that the pair of electrodes face each other in the luminous tube; a pair of thermal insulation films formed on an outer surface of the luminous tube around the pair of electrodes, respectively; zinc sealed in the luminous tube; halogen sealed in the luminous tube; a noble gas sealed in the luminous tube; and a metal sealed in the luminous tube, the metal having a lower ionization energy than zinc, a ratio of a molar density of the metal to a molar density of zinc being 0.001 to 0.05.