Pod clamping unit in pod opener, pod corresponding to pod clamping unit, and clamping mechanism and clamping method using pod clamping unit

A pod clamping method for fixing a pod at an upper side of a mounting surface of a mounting board of a pod opener of a wafer processing apparatus, the pod configured to store a wafer and has a clamped portion that protrudes towards a center of an engaging concave portion provided in the bottom surface of the pod from a side of the engaging concave portion, said pod clamping unit comprising:

• a first cylinder provided at an opposite side opposite to the upper side of the mounting surface, the first cylinder having a first cylinder rod extendable in a direction along an in-plane direction of the mounting board;
• a second cylinder, which is fixed to an end of the first cylinder rod, the second cylinder having the second cylinder rod extendable in a direction out of the mounting surface on the mounting board, the second cylinder rod extending through an opening provided in the mounting board;
• and
• a clamp member fixed to an end of the second cylinder rod,
• wherein said pod clamping method comprises the steps of,
• mounting the pod on a predetermined position of the mounting surface of the mounting board;
• extending the second cylinder rod to a lateral motion position that is farther than a distance between an inside surface of the clamped portion and the mounting surface on the mounting board by said second cylinder;
• extending or retracting the first cylinder rod so as to position said clamp member in the engaging concave portion while keeping the lateral motion position by said first cylinder;
• and
• retracting the second cylinder rod so as to contact the inside surface of the clamped portion to press said clamp member onto the clamped portion said second cylinder, so as to fix the pod.