Patent ID: 9425021
Filing Date: 2016-08-23
CPC Classification: G01N,H01J,H05G

Claim Text:
1. An X-ray generation apparatus of transmission type comprising: an electron emission source; and a target generating an X-ray with collision of electrons emitted from the electron emission source against the target, an electron passage surrounded by and formed in an electron passage forming member, and positioned on one side of the target closer to the electron emission source, wherein the electrons emitted from the electron emission source collide against the target after passing through the electron passage, wherein a cross-sectional area of the electron passage at least at an end thereof on a side closer to the target is larger than a cross-sectional area of the electron passage on a side farther away from the target, and at least a part of an inner wall surface of a region of the electron passage where the cross-sectional area thereof is increased serves as the secondary X-ray generation portion, and wherein an opening size (2R) of the electron passage at the end thereof on the side farther away from the target and a distance (Z) from an end of the secondary X-ray generation portion on the side closer to the target to an end of the secondary X-ray generation portion on the side farther away from the target satisfy a following relationship of: