Patent ID: 8883635

Claim:
A method of forming a plating electrode on a wafer comprising: preparing a wafer member, the wafer member including the wafer, a conductive layer formed on a surface of the wafer and a negative photoresist formed on the conductive layer; applying a light blocking material so as to cover an outer edge of the wafer member from an upper surface of the negative photoresist corresponding to a part of the plating electrode to be formed to a side surface of the negative photoresist; irradiating a first part of the negative photoresist with exposure light, the first part of the negative photoresist being disposed on a area including an area corresponding to the plating electrode to be formed; removing the light blocking material from the upper surface and the side surface of the negative photoresist; and developing the negative photoresist to remove a second part of the negative photoresist corresponding to the plating electrode to be formed and to expose a part of the conductive layer, thereby forming the plating electrode.