High-pressure gas discharge lamp
AssigneeKoninklijke Philips Electronics N.V.
InventorHolger Monch
Life of this patent
Estimating the term…
Abstract
A description is given of a high-pressure gas discharge lamp (HID lamp) which comprises an at least essentially mercury-free discharge gas and is suitable and/or intended for use in projection displays, in particular in the form of a short-arc lamp. A lamp voltage and efficiency which are comparable to mercury lamps are essentially achieved in that the discharge gas comprises a noble gas and also zinc as a voltage gradient former and light generator, wherein the pressure of the zinc in the gas phase is preferably approximately 30 bar in the operating state of the lamp. An evaporation which is necessary to achieve this pressure is made possible by increasing in particular the lowest temperatures in the discharge vessel. Various measures are proposed for increasing the temperature.
Claims11
A high-pressure gas discharge lamp, in particular with a short arc, comprising a discharge vessel (1) with an at least essentially mercury-free discharge gas which contains a noble gas and also zinc as a voltage gradient former and light generator, wherein the lamp is designed in such a way that the pressure of the zinc in the gas phase is at least approximately 20 bar in the operating state of the lamp.
Dependencies are inferred from the claim text.