Patent ID: 6953522
Filing Date: 2005-10-11
Classification: C25D,C25F,Y10S

Abstract:
1. A liquid treatment method in which by applying a voltage between an electrode disposed in contact with a treatment solution accommodated in a liquid treatment bath and a substrate being treated having a metal layer, the substrate being treated is liquid treated, the method comprising: coming into electrical contact, due to a first contact member, with the metal layer of the substrate being treated at an approximate center of the substrate being treated; supplying power of a negative side or positive side from the first contact member to the substrate being treated in electrical contact with the first contact member; coming into electrical contact, due to a second contact member, with the metal layer of the substrate being treated at a periphery portion of the substrate being treated; and supplying power of a negative side or positive side from the second contact member to the substrate being treated in electrical contact with the second contact member; wherein power supplies from the first contact member and the second contact member are controlled to increase and decrease alternatingly.