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Rotary-anode X-ray tube
| Details |
Inventors: Hubner, Horst; Lersmacher, Bernhard;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Segal; Robert
Assistant Examiner:
Attorney, Agent or Firm: Kraus; Robert J.
In a rotary anode X-ray tube, comprising an anode disc which is mounted on a rotary shaft and which comprises a basic body of graphite, the anode disc is subject to such loads during the operation of the X-ray tube that a connection between the disc and the shaft is liable to fracture if it consists of pressed and sintered graphite. In order to counteract fracturing, the basic body is connected to the shaft by a bushing of pyrolytic or microporous graphite. A pyrolytic graphite bushing may be formed by deposition from the gaseous phase in situ or on a mandril, and should have a radial direction of growth. Both materials have a high strength and, moreover, a lower thermal conductivity in the radial direction. As a result, not only is the strength improved, but the thermal loading of the shaft bearings is also reduced. |
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DETAILED DESCRIPTION What is claimed is: 1.
A rotary anode X-ray tube including an anode comprising a graphite disc having a central opening, and a bushing in the opening affixed to the disc to facilitate mounting of the anode on a shaft, said bushing comprising pyrolytic graphite having a radial growth direction with respect to the center of the opening.
2.
A rotary anode X-ray tube as in claim 1 wherein said bushing is non-annular.
3.
A rotary anode X-ray tube as in claim 1 or 2 where said bushing is formed from pyrolytic graphite deposited on the surface of the disc inside the opening.
4.
A rotary anode X-ray tube as in claim 1 or 2 where said bushing is affixed to the disc by means of solder.
5.
A rotary anode X-ray tube as in claim 4 where said solder is a high melting point metallic solder deposited on the surface of the disc inside the opening.
6.
A rotary anode X-ray tube including an anode comprisng a graphite disc having a central opening, and a bushing in the opening affixed to the disc to facilitate mounting of the anode on a shaft, said bushing being formed from microporous graphite.
7.
A rotary anode X-ray tube as in claim 6 where said bushing is non-annular.
Description:
BACKGROUND OF THE INVENTION The invention relates to a rotary-anode X-ray tube, comprising an anode disc which is mounted on a rotary shaft and which comprises a basic body of graphite, and also relates to a method of manufacturing an anode disc for such an X-ray tube.
German Auslegeschrift No.
1,764,042, which corresponds to U.
S.
Pat.
No.
3,539,859, describes such an X-ray tube wherein the basic body consists of pressed and sintered graphite.
In comparison with anode discs having a basic body of molybdenum or a molybdenum alloy, an anode disc of graphite offers the advantage that it is particularly light, has a thermal capacity and also a high thermal emissivity.
It is a drawback of this known X-ray tube that the connection between the anode disc and the rotary shaft, which is driven by a motor, fractures after a relatively short operating time
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Telecommunications 
