Patent ID: 7928678

Claim:
A door opening/closing device which moves a door back and forth along a guiding rail to close or open the door, the door opening/closing device comprising: a drive mechanism which drives the door by a driving force produced by a motor; a sensor configured for detecting at least an initial position of the door; and a controller which controls a speed of the door; wherein the controller is configured to calculate a moving amount of the door from the initial position to a destination position, to select a speed pattern from a plurality of speed patterns which is preinstalled in the controller based on the calculated moving amount, and to control the speed of the door according to the selected speed pattern, such that the door is accelerated at the same acceleration as a reference door opening/closing speed pattern while the acceleration ends at a position which is closer to a destination position than that of the reference door opening/closing speed pattern when the initial position is a halfway position.