Patent ID: 6977988

Claim:
An X-ray image taking device, comprising: an emitting unit that emits an X-ray; an image taking control unit that transmits an X-ray irradiation instruction signal to the emitting unit; a sensor that receives the X-ray on an image taking region thereof and converts the received X-ray into image data; a drive unit that switches the sensor to a charge accumulation state on a basis of a timing when the X-ray irradiation instruction signal is transmitted and a pre-delay period which is measured in advance; and an X-ray detecting unit that measures the pre-delay period by receiving the X-ray independently from an operation of the sensor and transmits a signal in accordance with the reception of the X-ray, wherein the image taking control unit sets the pre-delay period to a period from the time when the X-ray irradiation instruction signal is transmitted to a time when the image taking control unit receives the signal from the X-ray detecting unit, and wherein the X-ray detecting unit is provided outside the image taking region of the sensor.