Patent ID: 6227926
Filing Date: 2001-05-08
Classification: G03F,H01J

Abstract:
A process for producing an electrode for a high pressure discharge lamp comprising the following steps:a first step for applying an applying liquid comprising a sintered medium having graphite incorporated therein to a cathode or both of the cathode and anode for a discharge lamp at the position except for the edge portion and drying the medium,a second step for carrying out a previous heat treatment of the applying liquid in vacuo at a temperature appropriate to removing the impurities contained in the applying liquid to remove the impurities,a third step for heating the applying liquid at a temperature appropriate to sintering the applying liquid in an inert gas to sinter the sintering medium onto the electrode,a fourth step for removing the sintered applying medium, anda fifth step for heating the electrode, from which the applying medium has been removed, in vacuo at a carbonization temperature appropriate to obtaining a desired depth of the carbonized layer.