Substrate for liquid discharge head, liquid discharge head using substrate for liquid discharge head and method of manufacturing the same

A liquid discharge head discharging a liquid from a liquid discharge port on the basis of a discharge energy generated from a discharge energy generating portion comprising:

• an electric wiring for supplying an electric power to said discharge energy generating portion, said electric wiring being a metal film formed in accordance with a plating method;
• an electrode pad receiving the electric power supplied to said electric wiring from an outer portion of a substrate for the liquid discharge head, said electrode pad being formed by using the same metal material as said electric wiring in accordance with a plating method;
• and
• a flow path forming layer provided through a resin layer covering an upper side of said electric wiring, and forming said liquid discharge port and a liquid flow path guiding the liquid to said liquid discharge port;
• wherein a close contact improving layer is formed in a lower layer of said electrode pad, and a width of said electrode pad is narrower than a line width of said electric wiring.

A method of manufacturing a substrate for a liquid discharge head discharging a liquid from a liquid discharge port on the basis of a discharge energy generated from a discharge energy generating portion comprising the steps of:

• a step of forming a metal film serving as an electric wiring for supplying an electric power to said discharge energy generating portion in accordance with a plating method;
• and
• a step of forming an electrode pad receiving the electric power supplied to said electric wiring from an outer portion of said substrate for the liquid discharge head by using the same metal material as said electric wiring in accordance with a plating method;
• wherein a close contact improving layer is formed in a lower layer of said electrode pad, and a width of said electrode pad is narrower than a line width of said electric wiring.