Patent ID: 8931432
Filing Date: 2015-01-13
Classification: C23C,H01J,H01L

Abstract:
1. A vacuum processing apparatus comprising: a plurality of plate-like discharge electrodes that is supplied with high-frequency power from a power supply unit through feeding points thereof, and forms plasma with respect to a substrate placed on a counter electrode respectively, and a plurality of matching boxes, wherein one end of each of the plurality of discharge electrodes is electrically connected to another end of each of the plurality of discharge electrodes via a loop circuit, wherein the plurality of matching boxes tunes phases and amplitude of the high-frequency power supplied to the plurality of discharge electrodes at the feeding points respectively, wherein the plurality of matching boxes includes one matching box which is configured to tune the high-frequency power supplied to one discharge electrode, the one matching box corresponding to the one discharge electrode, wherein the one matching box is configured to set an impedance value such that a reflected power returned from the one discharge electrode to the power supply unit is approximately minimized, wherein impedance values of the plurality of matching boxes are set to approximately the same value as a measured value obtained by measuring the impedance of the one matching box, and wherein the vacuum processing apparatus is configured to perform reflected-power tuning, in which among the plurality of matching boxes that tunes phases and amplitudes of the high-frequency power supplied to the plurality of discharge electrodes that form plasma with respect to the substrate placed on the counter electrode respectively, impedance of the one matching box, which tunes the high-frequency power supplied to the one discharge electrode, is set such that reflected power returned from the one discharge electrode is approximately minimized, and setting, in which the impedance of other matching boxes is set to approximately the same impedance as the impedance of the one matching box.