MICROMINIATURE X-RAY TUBE WITH TRIODE STRUCTURE USING A NANO EMITTER
First Claim
1. A microminiature X-ray tube with a triode structure using a nano emitter, comprising:
- a cathode having fine-patterned nano emitters;
a gate disposed above the cathode to induce electron emission and focus electron beams;
an electron emitter including a cover disposed above the gate; and
an anode disposed above the electron emitter and accelerating electrons emitted from the cathode to generate an X-ray by means of electron collision,wherein the electron emitter is fixed from the cathode to the cover by a bonding material.
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Abstract
A microminiature X-ray tube with a triode structure using a nano emitter is provided, which can increase a field emission region as much as possible by means of nano emitters fine-patterned in a cathode to not only increase an emission current per unit area as much as possible but secure high electrical characteristics, reliability, and structural stability by means of a cover and a bonding material. In addition, gate holes having a macro structure can be formed in the gate to promote electron beam focusing by means of the gate without using a separate focusing electrode and to prevent a leakage current from occurring on the gate. Further, an auxiliary electrode can be formed on a top or an inner surface of a cover applied for structural stability to further promote the electron beam focusing and to control the output amounts per individual X-ray tubes output according to current switching to be equal to each other.
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Citations
15 Claims
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1. A microminiature X-ray tube with a triode structure using a nano emitter, comprising:
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a cathode having fine-patterned nano emitters; a gate disposed above the cathode to induce electron emission and focus electron beams; an electron emitter including a cover disposed above the gate; and an anode disposed above the electron emitter and accelerating electrons emitted from the cathode to generate an X-ray by means of electron collision, wherein the electron emitter is fixed from the cathode to the cover by a bonding material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification