Back to results
US 9,653,248 B2Granted
X-ray tube
AssigneeToshiba Electron Tubes & Devices Co., Ltd.
InventorsTomonari Ishihara, Naoki Akahori, Hidero Anno
Life of this patent
Estimating the term…
Abstract
According to one embodiment, an X-ray tube includes an anode target, a cathode including a filament and a convergence electrode which includes a groove portion, and an envelope. The groove portion includes a pair of first bottom surfaces which are located in the same plane as the filament and between which the filament is interposed in a width direction of the groove portion, and a pair of second bottom surfaces between which the filament and the pair of first bottom surfaces are interposed in a length direction of the groove portion and which are located closer to an opening of the groove portion than the pair of first bottom surfaces.
Claims10
An X-ray tube comprising:
- an anode target which emits X-rays upon incidence of an electron beam on the anode target;
- a cathode including a filament and a convergence electrode which includes a groove portion in which the filament is provided, and which causes an electron beam to focus, the electron beam being emitted from the filament toward the anode target through an opening of the groove portion;
- and
- an envelope which accommodates the anode target and the cathode,
- wherein
- a length direction of the groove portion is a direction along a major axis of the filament, and a width direction of the groove portion is a direction perpendicular to a depth direction and the length direction of the groove portion;
- the groove portion includes:
- a pair of first bottom surfaces which are located in the same plane as the filament and between which the filament is interposed in the width direction;
- and a pair of second bottom surfaces between which the filament and the pair of first bottom surfaces are interposed in the length direction and which are located closer to the opening than the pair of first bottom surfaces, and
- end portions of the filament are interposed between the pair of second bottom surfaces in the width direction.
7 more elements
An X-ray tube comprising:
- an anode target which emits X-rays upon incidence of an electron beam on the anode target;
- a cathode which includes a first filament, a second filament, and a convergence electrode which includes a first groove portion in which the first filament is provided, and a second groove portion in which the second filament is provided, the convergence electrode being provided to cause an electron beam emitted from the first filament toward the anode target through an opening of the first groove portion to focus, and also to cause an electron beam emitted from the second filament toward the anode target through an opening of the second groove portion to focus;
- and
- an envelope which accommodates the anode target and the cathode,
- wherein
- a length direction of the first groove portion is a direction along a major axis of the first filament, a width direction of the first groove portion is a direction perpendicular to a depth direction and the length direction of the first groove portion, a length direction of the second groove portion is a direction along a major axis of the second filament, and a width direction of the second groove portion is a direction perpendicular to a depth direction and the length direction of the second groove portion,
- the first groove portion includes:
- a pair of first bottom surfaces which are located in the same plane as the first filament and between which the first filament is interposed in the width direction of the first groove portion;
- and a pair of second bottom surfaces between which the first filament and the pair of first bottom surfaces are interposed in the length direction of the first groove portion, and which are located closer to the opening of the first groove portion than the pair of first bottom surfaces,
- end portions of the first filament are interposed between the pair of second bottom surfaces in the width direction,
- the second groove portion includes:
- a pair of first bottom surfaces which are located in the same plane as the second filament and between which the second filament is interposed in the width direction of the second groove portion;
- and a pair of second bottom surfaces between which the second filament and the pair of first bottom surfaces are interposed in the length direction of the second groove portion, and which are located closer to the opening of the second groove portion than the pair of first bottom surfaces, and
- end portions of the second filament are interposed between the pair of second bottom surfaces in the width direction.
11 more elements
Dependencies are inferred from the claim text.