Patent ID: 7361971

Claim:
A semiconductor wafer protection structure, comprising a circular semiconductor wafer and a circular laminated protective sheet overlaid on a circuit surface of the circular semiconductor wafer, whereby said circular laminated protective sheet prevents vibration and damage to the wafer during backgrinding and transportation, wherein the circular laminated protective sheet comprises a first circular protective layer having substantially the same size as an outer diameter of the circular semiconductor wafer and a second circular protective layer laminated on the first circular protective layer and having an outer diameter that is equal to or larger than the outer diameter of the first circular protective layer, and the circular laminated protective sheet is overlaid on the circuit surface via the side of the first circular protective layer, and the first circular protective layer includes a film having a stress relaxation rate of at least 40% after 1 minute of 10% elongation, and the second circular protective layer includes a film having a value of Young's modulus×thickness of at least 5.0×10 4 N/m.