of a wafer rotation driving roller of the wafer flat zone aligner of the present invention; [0026]FIG. 3 is perspective view of an end portion of the wafer rotation driving roller; [0027]FIG. 4 is a side view of the wafer flat zone aligner in accordance with the present invention, during operation; and [0028]FIG. 5 is a front view of the end portion of the wafer rotation driving roller of the wafe