Patent ID: 7573979

Claim:
An X-ray imaging apparatus comprising: an imaging unit, taking an X-ray image obtained by X-ray irradiation; an X-ray detecting unit, outputting, when X-rays are irradiated, an X-ray detection signal over an irradiation period; a first pulse output unit, outputting, when the X-ray detection signal is input from the X-ray detecting unit, a first pulse with a preset pulse width at an input timing of the X-ray detection signal and, when a new X-ray detection signal is input from the X-ray detecting unit during output of the first pulse, extendingly outputting the first pulse, being output, further for a period corresponding to the pulse width from the input timing of the new X-ray detection signal; a second pulse output unit, outputting, in a state where one or both of the X-ray detection signal and the first pulse are being input, a second pulse, with a pulse width corresponding to a period of the input, at a start timing of the input period; and a controlling unit, controlling, when the second pulse is input, the imaging unit to start imaging based on a start timing of the second pulse.