Hot cathode of X-ray tube
First Claim
1. A hot cathode of an X-ray tube of a kind having a thermoelectronic emitter supported by a heating element, wherein:
- said thermoelectronic emitter is comprised of plural emitter regions separated from each other; and
each of said emitter regions has a largest measure less than three millimeters.
1 Assignment
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Accused Products
Abstract
In a hot cathode of an X-ray tube of the kind having a thermoelectronic emitter supported by a heating element, the emitter is comprised of plural emitter regions separated from each other. Each emitter region has the largest measure less than 3 mm, so that no crack occurs on the thermoelectronic emitter. The hot cathode is comprised of a heating element made of glassy carbon and a thermoelectronic emitter supported by the heating element. The emitter is comprised of plural emitter regions made of sintered lanthanum hexaboride. The hot cathode can be produced as described below. The heating element with a thickness of 1 mm is formed, at its thermoelectron-emitting side, with four recesses each of which is 2.6 mm in length, 0.5 mm in width and 0.3 mm in depth. The recesses are filled with lanthanum hexaboride powder, which is then sintered to complete four emitter regions.
8 Citations
11 Claims
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1. A hot cathode of an X-ray tube of a kind having a thermoelectronic emitter supported by a heating element, wherein:
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said thermoelectronic emitter is comprised of plural emitter regions separated from each other; and
each of said emitter regions has a largest measure less than three millimeters. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of producing a hot cathode of an X-ray tube of a kind having a thermoelectronic emitter supported by a heating element, comprises steps of:
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(a) forming said heating element with plural recesses separated from each other, a largest plane measure of each of said recesses being less than three millimeters;
(b) filling said recesses with powder of material of said thermoelectronic emitter; and
(c) supplying said heating element with a current to sinter said powder so as to complete said hot cathode of the kind having said thermoelectronic emitter supported by said heating element. - View Dependent Claims (8, 9, 10, 11)
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Specification