Method for controlling movement operation of tray in optical disc drive without physical switch

An optical disc drive comprising a tray, an eject button, a motor for moving the tray, a timer, a detector for detecting a counter e.m.f generated in the motor, and a controller,

• wherein the controller sets first and second flags for indicating a current state of the tray, the state of the tray including an open state, a closed state and a state in which the tray moves, and controls a movement operation of the tray, based on values of the two flags and a time when the counter e.m.f detected through the timer and the detector is generated,
• wherein, if a tray closing operation is requested in the state in which the tray is opened is received, the controller performs the tray closing operation by controlling the motor, or if a tray opening operation is requested in the state in which the tray is closed is received, the controller performs the tray opening operation by controlling the motor, and the controller changes the value of the second flag, and
• wherein the controller sets a third flag for indicating a movement direction of the tray under the movement of the tray, and if it is decided that the movement of the tray is stopped, the controller changes any one of the values of the first and second flags based on a value of the third flag.