Patent ID: 7728303

Claim:
A radiation imaging device comprising: at least one base; and m×n (m being an integer no less than 2 and n being an integer no less than 1) radiation imaging elements arrayed above the at least one base, each radiation imaging element comprising (i) a solid-state imaging element having a photodetecting portion including pixels arrayed in two dimensions and a photodetecting surface facing a radiation-incident direction, and (ii) a scintillator formed on the photodetecting surface of the solid-state imaging element; wherein with any two adjacently positioned radiation imaging elements: the two radiation imaging elements are positioned such that a back one of the radiation imaging elements is positioned further from the radiation-incident direction than is a front one of the radiation imaging elements, and such that the photodetecting portion of the back radiation imaging element is not blocked by the front radiation imaging element when viewed from the radiation-incident direction; a back surface of the front radiation imaging element coupled to the at least one base and facing away from the radiation-incident direction protrudes more in the radiation incident direction than does a front surface of the back radiation imaging element facing in the radiation-incident direction; an end of the back radiation imaging element is blocked by the front radiation imaging element, and the scintillator of the back radiation imaging element is formed more outwardly toward the blocked end of the back radiation imaging element than is a portion of the photodetecting portion of the back radiation imaging element extending most outwardly toward the blocked end of the back radiation imaging element; and one of the back radiation imaging element and the front radiation imaging element is larger than the other.