X-ray generating tube, X-ray generating apparatus, and radiography system
AssigneeCanon Kabushiki Kaisha
InventorKazuya Tsujino
Life of this patent
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Abstract
The present disclosure provides a reliable X-ray generating tube that forms a focus with a stable size and shape. The X-ray generating tube includes an electron gun including an electron emitting portion, a plurality of grid electrodes, and an insulating support member that supports the plurality of grid electrodes. The electron gun includes a conductive section that hides the insulating support member to prevent the insulating support member from being directly viewed from an electron through path of electrons emitted from the electron emitting portion and passing through the grid electrodes.
Claims24
An X-ray generating tube comprising:
- an anode including an anode member and a target secured to the anode member configured to generate X rays in response to electronic irradiation;
- a cathode including a cathode member;
- an electron gun secured to the cathode member configured to generate electron beams toward the target;
- and
- an insulating tube secured to each one of the anode member and the cathode member and configured to electrically insulate between the anode and the cathode,
- wherein the electron gun includes an electron emitting portion configured to emit electrons, a plurality of grid electrodes with openings configured to define static potentials in the openings and form an electron beam passing path, and an insulating support member located outside with respect to the openings in a radius direction and configured to electrically insulate and support at least two out of the plurality of grid electrodes,
- wherein the insulating support member is concealed from the electron beam passing path by the plurality of grid electrodes configured not to be directly viewed from the electron beam passing through the openings.
An electron gun adapted for an X-ray generating tube comprising:
- an electron emitting portion configured to emit electrons;
- a plurality of grid electrodes with openings configured to form an electron beam passing path;
- and
- an insulating support member located outside with respect to the openings in a radius direction and configured to electrically insulate and support proximal two out of the plurality of grid electrodes,
- wherein the insulating support member is concealed from the electron beam passing path by the plurality of grid electrodes configured not to be directly viewed from the electron beam passing path.
Dependencies are inferred from the claim text.