Patent ID: 7106829

Claim:
An X-ray generator comprising: a casing for accommodating components of the X-ray generator; an X-ray tube including an emitting window provided on a top portion thereof from which an x-ray is emitted in an x-ray emitting direction, and an election gun connected to and extending in a predetermined direction from an outer side portion of the x-ray tube for emitting an electron from an electron emitting surface of the electron gun toward a target surface within the x-ray tube, thereby causing the x-ray tube to generate the x-ray, wherein the electron emitting surface of the electron gun substantially faces toward at least a portion of the target surface within the x-ray tube, wherein the casing includes: a top surface being situated perpendicular to the x-ray emitting direction; first and second vertical side surfaces which are faced towards each other and are respectively situated to extend in a perpendicular direction to the top surface of the casing; and a taper surface inclined with respect to the x-ray emitting direction and extending between the first vertical side surface and the top surface of the casing, wherein said first and second vertical surfaces are asymmetrically positioned with respect to the x-ray emitting direction of the x-ray, as emitted from the emitting window, the distance between the first vertical surface and the x-ray emitting direction of the x-ray, as emitted from the emitting window, is longer than the distance between the second vertical surface and the x-ray emitting direction of x-ray, as emitted from the emitting window.