VACUUM CONTAINER USING BERYLLIUM FOIL FOR WINDOW

摘要

PURPOSE:To provide a vacuum container which uses a beryllium foil for the window and whose window is prevented from being cracked or damaged beforehand to improve air-tightness of the window and provide manufacturing method of the container. CONSTITUTION:A vacuum container 1 using a beryllium foil for the window is a container having a window 2 made of a beryllium foil with thickness from 10 to 100mum by diffusion joining or soldering of the foil to an open part 1a. The micro Vicker's hardness of the beryllium foil is set to be 150-300 and the shear stress of the beryllium foil is set to be >=3.0g/mum/mm<2> for unit thickness of the beryllium foil (mum) in the case the thickness is <70mum and >=2.5g/mum/mm<2> in the case the thickness is >=70mum.