# US 2019/0318901 A1 · X-ray tube

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0318901 A1
- Document ID: US20190318901A1
- Status: Published application
- Kind: A1
- Application number: 16/380,224
- Filed: 2019-04-10
- Published: 2019-10-17
- Earliest claimed: 2018-04-12
- Assignees: Hamamatsu Photonics K.K.
- Applicants: Hamamatsu Photonics K.K.
- Inventors: Atsushi ISHII; Ryosuke YABUSHITA; Tutomu INAZURU
- Web page: https://patentgrep.com/patent/US20190318901A1

## CPC

- H01J 35/112: {Non-rotating anodes (H01J35/12 takes precedence)}
- H01J 35/16: Vessels; Containers; Shields associated therewith
- H01J 2235/16: Vessels
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

An X-ray tube includes a vacuum housing, an electron gun, and an anode that includes a target emitting X-rays and a target supporting portion supporting the target. The target supporting portion has an anode main body portion and a protrusion portion including a side surface portion. The anode main body portion includes an outer circumferential surface extending in a direction of a tube axis, and a connection portion formed between the side surface portion of the protrusion portion and the outer circumferential surface. An angle formed by the outer circumferential surface and the connection portion is an obtuse angle.

## Claims

### Claim 1

An X-ray tube comprising:
a vacuum housing;
an electron gun that is accommodated in the vacuum housing and emits electrons; and
an anode that includes a target which is accommodated in the vacuum housing, receives electrons provided from the electron gun, and emits X-rays, and a target supporting portion which supports the target,
wherein the target supporting portion has
a main body portion having a columnar shape which extends in a direction of an axis line, and
a protrusion portion including a side surface portion which extends in the direction of the axis line from the main body portion, and an inclined surface which is connected to the side surface portion, which intersects the axis line, and in which the target is disposed,
wherein the protrusion portion has a cross section intersecting the axis line with a smaller area than the main body portion,
wherein the main body portion includes
an outer circumferential surface extending in the direction of the axis line, and
a connection portion formed between the side surface portion of the protrusion portion and the outer circumferential surface, and
wherein an angle formed by the outer circumferential surface and the connection portion is an obtuse angle.

### Claim 2 (depends on 1)

The X-ray tube according to claim 1,
wherein the side surface portion includes
a main surface facing the electron gun, and
a pair of side surfaces intersecting the main surface,
wherein the connection portion includes
a first connection surface formed between the outer circumferential surface and the main surface, and
a second connection surface formed between the outer circumferential surface and the side surface,
wherein an angle formed by the outer circumferential surface and the first connection surface is an obtuse angle, and
wherein an angle formed by the outer circumferential surface and the second connection surface is an obtuse angle.

### Claim 3 (depends on 2)

The X-ray tube according to claim 2,
wherein the main body portion includes a first chamfered portion formed between the first connection surface and the second connection surface.

### Claim 4 (depends on 2)

The X-ray tube according to claim 2,
wherein the protrusion portion includes a second chamfered portion formed between the main surface and the side surface.

### Claim 5 (depends on 2)

The X-ray tube according to claim 2,
wherein the main body portion includes
a third chamfered portion formed between the first connection surface and the outer circumferential surface, and
a fourth chamfered portion formed between the second connection surface and the outer circumferential surface.

### Claim 6 (depends on 1)

The X-ray tube according to claim 1,
wherein the angle formed by the outer circumferential surface and the connection portion is smaller than an angle formed by a distal end surface and the inclined surface.

### Claim 7 (depends on 1)

The X-ray tube according to claim 1,
wherein the axis line is a center axis line of the main body portion, and
wherein the target is disposed at a position intersecting the axis line.

### Claim 8 (depends on 1)

The X-ray tube according to claim 1,
wherein the vacuum housing includes a metal housing portion which is formed of a metal and accommodates at least a part of the protrusion portion and the main body portion,
wherein the metal housing portion includes an inner circumferential surface portion facing the connection portion, and
wherein the inner circumferential surface portion is inclined with respect to the axis line to correspond to an inclination of the connection portion.