X-ray generation apparatus and X-ray imaging apparatus

An X-ray generation apparatus comprising:

• an X-ray generation tube including an insulating tube with a first opening end and a second opening end, a cathode arranged to close the first opening end of the insulating tube and including an electron emitting portion, and an anode arranged to close the second opening end and including a target that generates X-rays when electrons from the electron emitting portion collide;
• a driving circuit configured to drive the X-ray generation tube;
• and
• an accommodating container configured to accommodate the X-ray generation tube and the driving circuit,
• wherein the accommodating container has a third opening end, and the X-ray generation tube is arranged to close the third opening end,
• the accommodating container is filled with an insulating liquid,
• the accommodating container defines a first space storing the driving circuit, and a second space protruding from the first space and storing the X-ray generation tube,
• the accommodating container includes a protrusion portion surrounding the second space, and one end of the second space forms the third opening end,
• an outer surface of the cathode includes a cylindrical side surface, and
• the side surface of the cathode is surrounded by a first member, and the first member is surrounded by a second member arranged between the first member and the accommodating container,
• the accommodating container includes a convex portion protruding toward an interior of the accommodating container in a section including an axis of the X-ray generation tube, and
• the second member has a first region which overlaps a virtual line connecting the convex portion and an outer surface of the cathode, and a second region closer to the anode than the first region, and a maximum value of a thickness of the second member in the first region is larger than a maximum value of a thickness of the second member in the second region.