Patent ID: 7454832

Claim:
A method of forming a metal plate pattern, comprising the steps of: forming a patterned first metal layer, material of which being different from that of a metal plate, on at least one of two surfaces of the metal plate; conducting selective half etching to the metal plate using the first metal plate layer as a first mask; coating a negative resist on the half etched surface from an upper portion of the first mask, and by exposure and development from the upper portion of the first mask, removing the unexposed soluble negative resist of the side etching layer formed under the first mask; forming a second metal layer as a second mask, material of which being different from that of the metal plate, on the side etched layer from which the negative resist has been removed; removing the negative resist exposed and set; selectively half etching the metal plate again through the first and second masks; and removing the first and second masks.