Patent ID: 7731029

Claim:
A tray for loading substrates with various sizes, comprising: a base which has an upper surface with one or more grooves; an outer frame located around four edges of the upper surface of the base to thereby form a first space, the outer frame having two oppositely arranged first cavities; a plurality of lateral supporters which are arranged on the base at the four edges defining the first space against the outer frame and have second cavities arranged on internal surfaces of the lateral supporters and corresponding to the one or more grooves on the upper surface of the base; and a plurality of corner bumps which are arranged at four corners inside the outer frame, and which are adjacent to the lateral supporters, the base, and the outer frame, wherein a top surface of each of the corner bumps is below an upper edge portion of the outer frame, wherein each corner bump of the plurality of corner bumps has a plurality of buffer openings located at corners of each corner bump.