Patent Number: 051611791
Section: claims

1. A beryllium window for transmitting x-ray radiation comprising: a) a beryllium plate containing beryllium as an essential element;  b) a reinforcing unit for retaining said beryllium plate; and  c) a welding film diffused into a part of the beryllium plate and a part of the reinforcing unit through a diffusion phenomenon, said welding film being formed of a substrate having at least one element selected from the group consisting of silver, gold, nickel and copper, the reinforcing unit being formed of a substance allowing the at least one element to diffuse thereinto.  a) a beryllium plate essentially composed of beryllium and shaped into a disk configuration, said beryllium plate being of the order of 25 microns in thickness;  b) a welding film deposited on an outer peripheral portion of said beryllium plate and formed of nickel, said welding film being of the order of 10 microns in thickness;  c) a retaining member formed of a stainless steel and generally shaped into a ring configuration, said retaining member having an inner peripheral portion thinner than an outer peripheral portion of said retaining member for producing a step configuration therebetween, said welding film being partially merged into said outer peripheral portion of said beryllium plate and into said inner peripheral portion of said retaining member through a diffusion welding; and  d) a pressing member having a ring-shaped projection projecting from an inner peripheral portion thereof, said ring-shaped projection being inserted into said retaining member for providing a protection to said beryllium plate.  a) preparing a beryllium plate containing beryllium as an essential element, a welding substance containing at least one element selected from the group consisting of silver, gold, nickel and copper, and a reinforcing unit formed of a substance allowing said at least one element of diffuse thereinto;  b) forming a film of said welding substance on a part of said beryllium plate; and  c) welding said beryllium plate to said reinforcing unit through a diffusion of said welding substance into said beryllium plate and said reinforcing unit.  a) preparing a beryllium plate containing beryllium as an essential element, a welding substance containing at least one element selected from the group consisting of silver, gold, nickel and copper, and a reinforcing unit formed of a substance allowing said at least one element to diffuse thereinto;  b) forming a film of said welding substance on a part of said reinforcing unit; and  c) welding said beryllium plate to said reinforcing unit through a diffusion of said welding substance into said beryllium plate and said reinforcing unit. 2. A beryllium window as set forth in claim 1, in which said reinforcing unit comprises a retaining member formed of a stainless steel. 3. A beryllium window as set forth in claim 1, in which said welding film ranges from about 1 micron to about 200 microns in thickness. 4. A beryllium window as set forth in claim 1, in which said beryllium plate is as thin as about 25 microns. 5. A beryllium window as set forth in claim 2, in which said beryllium plate is shaped into a disk configuration, and in which said retaining member is shaped into a ring configuration having an outer peripheral portion thicker than an inner peripheral portion, said beryllium plate being mounted on said retaining member in such a manner that said welding film is held in contact with said inner peripheral portion. 6. A beryllium window as set forth in claim 5, in which said reinforcing unit further comprises a pressing member with a ring-shaped projection, and in which said ring-shaped projection is inserted into said reinforcing member for providing a protection to said beryllium plate. 7. A beryllium window as set forth in claim 2, in which said welding film is formed of a substance containing more than one element selected from the group consisting of silver, gold, nickel and copper. 8. A beryllium window used in an x-ray radiating system, a difference in pressure being exerted on said beryllium window, comprising: 9. A process of fabricating a beryllium window for transmitting x-ray radiation comprising the steps of: 10. A process of fabricating a beryllium window as set forth in claim 9, in which said reinforcing unit comprises a retaining member formed of a stainless steel. 11. A process of fabricating a beryllium window as set forth in claim 9, in which said film of said welding substance is deposited on the part of said beryllium film by using a vapor phase deposition technique. 12. A process of fabricating a beryllium window as set forth in claim 11, in which said vapor phase deposition technique is a vacuum evaporation. 13. A process of fabricating a beryllium window as set forth in claim 9, in which said diffusion welding is carried out in a vacuum ambience ranging from about 10.sup.-2 torr to about 10.sup.-6 torr. 14. A process of fabricating a beryllium window as set forth in claim 13, in which said vacuum ambience is heated at 300 degrees to 900 degrees in centigrade. 15. A process of fabricating a beryllium window as set forth in claim 14, in which said beryllium plate and said film of said welding substance are pressed at 1 kg/mm.sup.2 to 100 kg/mm.sup.2 against said reinforcing unit. 16. A process of fabricating a beryllium window as set forth in claim 15, in which said beryllium plate and said film of said welding substance are pressed against said reinforcing unit for a predetermined time period ranging from about 30 minutes to about 120 minutes. 17. A process of fabricating a beryllium window as set forth in claim 9, in which said welding substance further contains another element selected from the group consisting of silver, gold, nickel and copper. 18. A process of fabricating a beryllium window used in an x-ray tube for transmitting x-ray, a difference in pressure being exerted on said beryllium window, comprising the steps of: