Patent Number: 
Section: claims

1. An X-ray tube device comprising:a main body that incorporates a bulb, which generates X-rays;a collimator that is provided to protrude from the main body in an irradiation direction of the X-rays in a part of a first surface, which is a surface of the main body, and has an irradiation window for irradiating the X-rays with an adjusted irradiation range; andconnectors that are provided for connecting a guard unit for keeping a distance from a test object, between the first surface of the main body and a second surface, which is a surface of the collimator where the irradiation window is provided, and the guard unit is connected to the connectors,wherein the guard unit comprisesa first pillar portion, a second pillar portion, a third pillar portion, and a fourth pillar portion extending in the irradiation direction from the second surface of the collimator,a first beam portion that connects the first pillar portion and the fourth pillar portion on the test object side relative to the second surface,a second beam portion that connects the second pillar portion and the third pillar portion on the test object side relative to the second surface,a third beam portion that connects the first pillar portion and the second pillar portion on the first surface side relative to the second surface, anda fourth beam portion that connects the third pillar portion and the fourth pillar portion on the first surface side relative to the second surface. 2. The X-ray tube device according to claim 1,wherein the connectors are provided in the collimator. 3. The X-ray tube device according to claim 1,wherein the connectors have a shape in which a length in a direction perpendicular to the irradiation direction of the X-rays is longer than a length in a direction parallel to the irradiation direction of the X-rays. 4. The X-ray tube device according to claim 2,wherein the connectors have a shape in which a length in a direction perpendicular to the irradiation direction of the X-rays is longer than a length in a direction parallel to the irradiation direction of the X-rays. 5. The X-ray tube device according to claim 1,wherein the guard unit has a shape in which an interval between the first pillar portion and the second pillar portion and an interval between the third pillar portion and the fourth pillar portion spread in the irradiation direction of the X-rays. 6. The X-ray tube device according to claim 5,wherein the guard unit is configured such that the first pillar portion and the fourth pillar portion are parallel to each other, and the second pillar portion and the third pillar portion are parallel to each other. 7. The X-ray tube device according to claim 1,wherein the guard unit has the connectors in the third beam portion and the fourth beam portion. 8. The X-ray tube device according to claim 1,wherein, in a case where the main body has a rectangular parallelepiped shape,the first beam portion connects the first pillar portion and the fourth pillar portion in a transverse direction of the first surface,the second beam portion connects the second pillar portion and the third pillar portion in the transverse direction of the first surface,the third beam portion connects the first pillar portion and the second pillar portion in a longitudinal direction of the first surface, andthe fourth beam portion connects the third pillar portion and the fourth pillar portion in the longitudinal direction of the first surface. 9. The X-ray tube device according to claim 1,wherein, in a case where the main body has a rectangular parallelepiped shape, in comparison to a longitudinal direction of the first surface, the guard unit is longer than the collimator, and the guard unit is shorter than the main body.