Discharge lamp of the water cooled type

Abstract

A discharge lamp provided with an anode of the water cooled type achieves advantageous cooling directly connected a tungsten tip piece to a tip of a body element of the anode that is formed of copper has a water cooling arrangement therein, by having a maximum outer diameter of the tungsten tip piece about equal to an outer diameter D (mm) of the body element, and by maintaining the relationship between the outer diameter D and the thickness of the tungsten tip piece L of: 0.2.ltoreq.L/D.ltoreq.0.5. In accordance with a preferred embodiment, the tungsten tip piece is directly connected to a tip of a cylindrical body element inside of which a cooling water feed tube is arranged extending coaxially to the body element, and in which cooling water is fed from a base of this cooling water feed tube, along the cooling water feed tube, strikes an inner side of the tip end of the body element and finally is conveyed through a gap between an inner side of the body element and an outer side of the cooling water feed tube which serves as a cooling water drainage duct. Preferably, the tungsten tip piece has the shape of a truncated cone whose maximum outer diameter is about equal to the outer diameter D (mm) of the body element and a thickness in a lengthwise direction of the body element.

Dependencies are inferred from the claim text.