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Title: Heat sink target
Claims: What is claimed is: 1. In an X-ray target designed to be rotated on a central axis while causing X-rays to be directed from a finite plurality of angular intervals throughout a surface of the target, an improvement in the target comprising a base structure of extremely high melting point material, at least one cavity in said base structure, encapsulating means for each said cavity constructed of a high melting point material compatible with that of said base structure and filler means for each said cavity having a melting point substantially near a maximum operating temperature of the X-ray target permanently encapsulated by said base structure and said encapsulating means. 2. An X-ray target according to claim 1 in which there is only one cavity, one encapsulating means and one filler means. 3. An X-ray target according to claim 2 in which said cavity is annular in shape. 4. An X-ray target according to claim 1 in which said filler means is initially a liquid when encapsulated which hardens to a solid. 5. An X-ray target according to claim 1 in which said base structure is a molybdenum alloy and said encapsulating means is tantalun. 6. An X-ray target according to claim 5 in which an X-ray generating layer is permanently positioned on the surface of said target. 7. An X-ray target according to claim 1 in which said base structure is a tungsten alloy. 8. An X-ray target according to claim 1 in which said filler means is copper. 9. An X-ray target according to claim 1 in which said filler means has a melting temperature of approximately 1100.degree.C while the maximum operating temperature of the X-ray target is equal to or slightly greater than 1100.degree.C, whereby heat of fusion of the filler means is utilized to increase the efficiency of the target. 10. In an X-ray tube having an anode with a rotationally mounted target causing X-rays to be directed from a finite plurality of angular intervals throughout a first surface of the target, an improvement in the target comprising a base structure of extremely high melting point material, an X-ray generating layer permanently positioned on said base structure on the said first surface, at least one cavity in a second surface of the base structure, a cap means for each said cavity for forming an enclosed capsule between the base structure and each said cap means, each said cap means constructed of an extremely high melting point material compatible with that of said base structure, and filler means for each said cavity permanently encapsulated by said cap means and said base structure, said filler means having a melting point substantially near a maximum operating temperature of the target. 11. The target according to claim 10 in which said filler means has a melting temperature of approximately 1100.degree.C while the maximum operating temperature of the target is equal to or slightly greater than 1100.degree.C, whereby the heat of fusion of the filler means is utilized to increase the efficiency of the target. 12. The target according to claim 10 in which there is only one cavity, one encapsulting means and one filler means. 13. The target according to claim 10 in which said base structure is a molybdenum alloy, said encapsulating means is tantalum and said filler means is copper. 14. The target according to claim 10 in which said filler means is inserted in solid form and encapsulated by said base structure and said encapsulating means. 15. The target according to claim 14 in which said filler means is provided with at least one aperture therein for releasing gases from within. 16. The target according to claim 12 in which said filler means is substantially smaller than said cavity so that a void results within said cavity. 17. The target according to claim 16 in which said void is arranged to be toward the smallest radii of said base filler means. 18. The method of producing an improved target for an X-ray anode comprising constructing a base structure of high temperature alloy material, providing a central bearing surface in said base structure for rotating the target, providing at least one cavity within the base structure, inserting filler means having a melting point substantially identical to a maximum operating temperature of the target into each said cavity, assembling an encapsulating means for each said cavity, and permanently sealing each said cavity by raising the temperature of the target until said encapsulating means is permanently bonded to the base structure. 19. The method according to claim 18 further comprising utilizing the heat of fusion of the filler means to produce a target having a relatively sustained efficiency under high heat conditions. 20. The method according to claim 18 further comprising utilizing only one cavity within said base structure. 21. The method according to claim 18 further comprising utilizing a molybdenum alloy for the base structure and copper for the filler means. 22. The method according to claim 21 further comprising permanently attaching a thin layer of X-ray generating material to a first surface of said base structure. 23. The method according to claim 18 further comprising rotating said target while sealing each said cavity whereby the filler means is centrifugally arranged to be concentrated radially outward within the base structure. 24. The method according to claim 18 further comprising utilizing an annular shaped filler means. 25. The method according to claim 18 further comprising providing solid filler means. 26. The method according to claim 18 further comprising designing the filler means so that said filler means is smaller than said cavity whereby a void is produced in said cavity upon fusing said base structure and encapsulating means. 27. The method according to claim 25 further comprising drilling at least one aperture in each said filler means whereby gases from within the said cavity can escape from within. 28. The method according to claim 18 further comprising the filler means causing extensive pressure to be applied upon the encapsulating means against the base structure, said pressure assisting the fusing of the encapsulating means and said base structure. Other info: Inventors: Konieczynski, Ronald D. (North Royalton, OH, US) Application Number: 550845 Filing Date: 1975-02-18 Publication_date: 1976-05-25 Assignee: Primary Class(es): 378/144 378/127 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Chatmon, Jr., Saxfield Assistant Examiner: Attorney: Stanley; Ronald R. |
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