Method of producing inkjet printhead

A method of producing an inkjet printhead including a cavity unit having therein ink passages and formed by stacking a plurality of kinds of flat plates each of which has a specific ink-passage pattern for constituting the ink passages, the method comprising:

• preparing a large-sized material sheet for each kind of a plate, such that the material sheet comprises a plurality of plate regions, each of which corresponds to one individual plate of the kind, and which are contiguous to one another such that a reserved region for cutting is between each adjacent two plate regions and there is left no margin at a periphery of the material sheet;
• obtaining a laminate of the material sheets by stacking the material sheets of respective kinds of plates, with the corresponding plates in the respective material sheets aligned in a direction of stacking of the material sheets;
• and
• obtaining a plurality of individual laminates by cutting the laminate of the material sheets at the at least one reserved region into the individual laminates;
• wherein the preparing the material sheet comprises forming the material sheet such that:
• each of the plate regions has a rectangular shape;
• the plate regions are arranged in at least two rows and two columns;
• the at least one reserved region comprises at least two reserved regions, each of a part of which is a first reserved region extending between each two adjacent rows, and each of the other part of which is a second reserved region extending between each two plate regions adjacent in one of the rows, so that the first reserved region and the second reserved region are perpendicular to each other to form at least one intersecting point therebetween;
• at least two cutouts are formed in the material sheet;
• and
• at least one of the at least two cutouts is a through-hole formed at the at least one intersecting pint.

A method of producing an inkjet printhead including a cavity unit having therein ink passages and formed by stacking a plurality of kinds of flat plates each of which has a specific ink-passage pattern for constituting the ink passages, the method comprising:

• preparing a large-sized material sheet for each kind of a plate, such that the material sheet comprises a plurality of plate regions, each of which corresponds to one individual plate of the kind, and which are contiguous to one another such that a reserved region for cutting is between each adjacent two plate regions and there is left no margin at a periphery of the material sheet;
• obtaining a laminate of the material sheets by stacking the material sheets of respective kinds of plates, with the corresponding plates in the respective material sheets aligned in a direction of stacking of the material sheets;
• and
• obtaining a plurality of individual laminates by cutting the laminate of the material sheets at the at least one reserved region into the individual laminates;
• wherein the preparing the material sheet comprises forming the material sheet with metal and forming the ink-passage pattern by etching;
• and
• wherein the reserved region is formed by the etching in the form of a weakened portion, concurrently with the formation of the ink-passage pattern.