The present invention relates to an X- ray imaging apparatus, and more particularly to a conventional capable irradiation (照射) to also as to the change in angle X- ray imaging apparatus that is used to maintain a constant irradiated (照射) distance away adjustment the X- ray imaging apparatus which is provided and to a control method thereof. The present inventors investigated (照射) X- ray imaging apparatus which is provided with a length adjustment feature to this, at the same time as the angle adjustment by a plurality of knobs, X- ray irradiation X- ray generator that is mounted (照射) apparatus, irradiation (照射) and the dose adjusting device to adjust the amount of the line X- And the forward and reverse drive motor for left and right movement of the X- ray irradiation (照射) device Pinion to a rotational motion in accordance with the normal and reverse driving of the drive motor and Rack and for converting the rotational motion of the pinion into linear movement And an upper rail attached to the rack Is attached to the lower end of the holding is made in the holding rail it is configured such that the lower left and right Sliding. On the other hand, irradiation (照射) control method of the X- ray imaging apparatus which is provided with a length adjustment feature, the method comprising: setting the analyte investigated (照射) position Blood and measuring the angle of rotation by the rotation of the sample during the angular position determination condition sensor A step of computing the movement distance to the controller according to the measured angle And the X- ray irradiation according to the calculated value (照射) device to the film holder 400, and at the same time adjusting the horizontal and vertical directions right and left to move irradiation (照射) position adjustment step, irradiation (照射) position adjustment step and the X- ray irradiation is completed (照射) irradiating (照射) an X- ray When the irradiation (照射) is complete, the X- ray a step for return
