Patent ID: 9245707
Filing Date: 2016-01-26
CPC Classification: H01J,H05G

Claim Text:
1. An X-ray window for separating an ambient pressure region from a reduced pressure region, the window comprising: a primary X-ray-transparent window element separating the ambient pressure region from an intermediate region; a secondary window element separating the intermediate region from the reduced pressure region, which secondary window element comprises a side facing the reduced pressure region for receiving a contaminant depositing thereon; and heating means for applying an electric voltage between terminals of said secondary window element for thereby evaporating contaminant having deposited thereon, wherein said secondary window element comprises: a charge-drain layer, which faces the reduced pressure region and is connected to a charge sink; and heating circuitry, which is electrically insulated from the charge-drain layer, wherein said terminals, between which the voltage is applied, are located at a plurality of distinct points on the heating circuitry.