Liquid discharge device and manufacturing method thereof

A manufacturing method of a liquid discharge device comprising a flow channel unit having a plurality of nozzles for discharging liquid and a plurality of pressure chambers individually communicated with the plurality of individual nozzles, a drive unit having a plurality of drive parts for individually applying a discharge pressure to the liquid in the plurality of pressure chambers and a plurality of electrodes communicated with the plurality of drive parts in which a drive voltage is applied to each of the plurality of electrodes to selectively drive the plurality of drive parts, a wiring board having a board main body, a plurality of terminals formed on a surface of the board main body, and an insulating covering material for covering the plurality of terminals, and a plurality of protruding bumps each having conductivity which are disposed on the surface of the drive unit, communicated with the corresponding electrodes, and extended through the insulating covering material to be electrically connected to the corresponding terminals, comprising the steps of:

• processing the surface of each of the plurality of bumps such that, when a point which is positioned on an outer circumferential surface of a base end portion of one of the bumps, and is closest to one of the drive parts is assumed to be a closest point, and a point which is positioned on the outer circumferential surface of the base end portion of the bump, and is most distant from the drive part is assumed to be a most distant point, the uncured insulating covering material is less likely to flow in a close region including the closest point on the surface of each of the plurality of bumps than in a distant region including the most distant point on the surface of each of the plurality of bumps;
• applying the uncured insulating covering material to the surface of the board main body in the wiring board to cover the plurality of terminals;
• relatively moving the drive unit and the wiring board in a direction in which the drive unit and the wiring board approach each other to cause each of the plurality of bumps to be extended through the insulating covering material and pressed against each of the plurality of terminals;
• and
• curing the insulating covering material.