Patent ID: 7850827

Claim:
A double-layer shutter control method of a multi-sputtering system, for controlling rotation positions of first and second shutter plates rotatably arranged between a substrate and at least three targets, and each of the first and second shutter plates having at least one hole and being rotated independently of each other, the method comprising: sputtering in a first sputtering step a selected one or more of the targets selected as an object to be sputtered while blocking the substrate from the selected one or more of the targets by the first shutter plate; sputtering in a second sputtering step the selected one or more of the targets in a state that the first and second shutter plates are positionally arranged so that the substrate is exposed to the selected one or more of the targets through the holes of the first and second shutter plates and the substrate is blocked from the other targets except the selected one or more of the targets by the second shutter plate, rotating the first shutter plate so that a surface spot of the first shutter plate to which only a substance identical to a substance of a particular one of the targets is adhered faces the particular one target, and afterwards the first sputtering step is carried out while the surface spot faces the particular one of the targets, and further afterwards, when making the transition from the first sputtering step to the second sputtering step, the first shutter plate is rotated so that surface spots of the first shutter plate to which substances different from the substance of the selected one or more of the targets are adhered move so as not to face the selected one or more of the targets.