Radiation generating tube and radiation generating apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKoji Yamazaki, Yasue Sato, Kazuyuki Ueda
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Abstract
The present invention relates to a radiation generating tube. The radiation generating tube includes an envelope including an insulating tubular member having at least two openings, a cathode connected to one of the openings of the insulating tubular member, and an anode connected to the other of the openings of the insulating tubular member. At least one of the cathode and the anode and the insulating tubular member are bonded at a bonded portion with an electrically conductive bonding member; and the bonded portion bonded with the electrically conductive bonding member is coated with a dielectric layer.
Claims21
A radiation generating tube comprising:
- an envelope including an insulating tubular member having at least two openings, a cathode connected to one of the openings of the insulating tubular member, and an anode connected to the other of the openings of the insulating tubular member;
- an electron emitting source connected to the cathode;
- and
- a target connected to the anode,
- wherein the insulating tubular member and at least any one of the cathode and the anode are bonded at a bonded portion with an electrically conductive bonding member;
- and the bonded portion bonded with an electrically conductive bonding member is coated with a dielectric layer.
The radiation generating tube according to claim 21, wherein the dielectric layer coats a side of the electrically conductive bonding member facing the internal space of the envelope and the side of the electrically conductive bonding member facing the external space of the envelope so as to sandwich the electrically conductive material bonding member therebetween.
A method for manufacturing a radiation generating tube, the method comprising steps of:
- bonding both of a cathode and an anode to an opening of an insulating tubular member respectively with an electrically conductive bonding member so as to form an envelope having a pair of bonded portions and an internal space surrounded by the cathode, the anode and the insulating tubular member;
- providing a dielectric layer over the bonded portion so as to bridge at least any one of the cathode and the anode to the insulating tubular member;
- and
- reducing the pressure of the internal space of the envelope into negative pressure relative to an external space,
- wherein the pressure reducing step is performed after the step of providing a dielectric layer.
(canceled)
Dependencies are inferred from the claim text.