Patent ID: 7713593

Claim:
A surface treatment method using a plasma treatment apparatus which has an electric discharge generation portion facing a surface of a substrate with a gap therebetween, the substrate being placed on a supporting body, and a construction in which the gap is supplied with a treatment gas that contains oxygen, the method comprising: applying different voltages between the electric discharge generation portion and the supporting body such that plasma is obtained from the treatment gas supplied to the gap; moving one of the electric discharge generation portion and the substrate relative to the other in a first direction, while the surface of the substrate is being exposed to the plasma; moving, after the relative movement in the first direction and the exposure above-referenced, one of the electric discharge generation portion and the substrate relative to the other in a second direction opposite to the first direction, while the surface of the substrate is being exposed to the plasma; and exposing the substrate to atmospheric air between the process of the relative movement in the first direction and the exposure and the process of the relative movement in the second direction and the exposure.