Patent ID: 8166641

Claim:
A holding tray comprising: a frame formed for holding a substrate; a tray for holding the frame, the tray having a through hole, the frame being disposed inside the through hole of the tray; and at least one holding device formed on the frame for holding the substrate, an edge portion of the substrate being disposed between the frame and the at least one holding device, the at least one holding device pressing the substrate onto the frame, the at least one holding device comprising: an elastic member, a first end of the elastic member of the at least one holding device being anchored in the at least one holding device, a second end of the elastic member of the at least one holding device being directly fixed to the frame; and a press member for pressing an upper surface of the substrate to the frame, the press member being in a first position for pressing the upper surface of the substrate to the frame, the press member being rotated about an axis perpendicular to the upper surface of the substrate to be in a second position for releasing the substrate from the frame.