JP2004288654A5 - - Google Patents

Claims (12)

A discharge tube filled with at least one kind of rare gas and having a discharge space;
A pair of electrodes projecting into and facing the discharge space;
A current supply conductor for supplying current to the electrode;
A sealing portion extending from the discharge tube and hermetically sealing the current supply conductor;
An outer tube hermetically sealed to the discharge tube and surrounding the discharge tube ,
A different component gas having a starting voltage lower than the discharge starting voltage of the discharge tube and containing a component different from the rare gas is sealed in a space between the discharge tube and the outer tube,
A high pressure discharge lamp in which the different component gas generates light prior to discharge in the discharge tube when a discharge start voltage is applied . The heterogenous gas is _{Ne, Ar, Kr, Xe,} F 2, Cl 2, Br 2, at least one gas or more mixed gas selected from I 2, _{N 2,} claim 1, wherein High pressure discharge lamp. The heterogenous gas, 1.3 [kPa] is a pressure above 100 [kPa] or less, the high pressure discharge lamp according to claim 1, wherein. The high-pressure discharge lamp according to claim 1 or 2 , wherein the pressure of the different component gas is a pressure of 40 [kPa] or more and 80 [kPa] or less. Material constituting the discharge tube comprises a dielectric material, according to claim 1, 2 high pressure discharge lamp according. Do not contain mercury in the discharge space of the discharge tube, according to claim 1, 2 high pressure discharge lamp according.   The high pressure discharge lamp according to claim 1 or 2, wherein the discharge space of the discharge tube contains at least one metal halide.   The different component gas is
  The high-pressure discharge lamp according to claim 1 or 2, wherein light having a wavelength of 170 nm or more is generated by dielectric barrier discharge. The outer tube absorbs ultraviolet rays,
  The high-pressure discharge lamp according to claim 1, wherein the discharge tube transmits ultraviolet rays. In a discharge tube having a discharge space in which at least one kind of rare gas is enclosed and substantially free of mercury,
  An electric field is applied to a pair of electrodes that protrude into the discharge space and face each other,
  A different component gas having a starting voltage lower than the discharge starting voltage of the discharge tube and containing a component different from the rare gas is hermetically sealed to and surrounds the discharge tube and the discharge tube. A method for starting a high-pressure discharge lamp that is enclosed in a space between an outer tube and discharges before light emission due to the start of discharge.   The method for starting a high-pressure discharge lamp according to claim 10, wherein light generated from the different component gas is incident on an electrode surface protruding into a discharge space of the discharge tube, and electrons are emitted from the electrode surface by a photoelectric effect.   The method of starting a high pressure discharge lamp according to claim 11, wherein the electrons induce an avalanche as initial electrons to start discharge.