Method for manufacturing liquid ejection head

A method for manufacturing a liquid ejection head having a plurality of thermal energy generating elements which generate thermal energy to be utilized for ejecting liquid, an insulating layer covering the plurality of energy generating elements, a plurality of first portions provided on the insulating layer corresponding to the plurality of energy generating elements in one-to-one relationship, and a plurality of second portions provided on the plurality of the first portions in one-to-one relationship, comprising the following steps in the following order:

• preparing a base on which the plurality of thermal energy generating elements and the insulating layer are laminated in this order;
• forming a first metal layer containing a first metal material on the insulating layer of the base, and then patterning the first metal layer to thereby form the plurality of first portions and a connection portion for electrically connecting the plurality of the first portions from the first metal layer;
• inspecting conduction of the plurality of first portions through the connection portion;
• forming a second metal layer containing a second metal material on the first metal layer, and then patterning the second metal layer to form the plurality of second portions;
• and
• patterning the connection portion to thereby electrically isolate the plurality of first portions from each other.

A method for manufacturing a liquid ejection head having a plurality of thermal energy generating elements which generate thermal energy to be utilized for ejecting liquid, an insulating layer covering the plurality of energy generating elements, a plurality of first portions provided on the insulating layer corresponding to the plurality of energy generating elements in one-to-one relationship, and a plurality of second portions provided on the plurality of the first portions in one-to-one relationship, comprising the following steps in the following order:

• preparing a base on which the plurality of thermal energy generating elements and the insulating layer are laminated in this order;
• forming a first metal layer containing a first metal material on the insulating layer of the base;
• forming a second metal layer containing a second metal material on the first metal layer;
• collectively patterning the first metal layer and the second metal layer to form the plurality of first portions, the plurality of second portions, and a connection portion containing the first metal material and electrically connecting the plurality of first portions;
• inspecting conduction of the plurality of first portions through the connection portion;
• and
• patterning the connection portion to thereby electrically isolate the plurality of first portions from each other.