Positioning method

A method of making an electronic droplet discharge head that includes positioning a channel forming member and an actuator unit, the channel forming member including a liquid chamber which communicates with a discharge port through which a droplet is discharged, the liquid chamber having an opening being opened to a surface of the channel forming member, the actuator unit including an electrode disposed on a surface thereof, the actuator unit being configured to apply discharge energy to liquid contained in the liquid chamber to be discharged from the discharge port when a drive signal is supplied to the electrode,

• the positioning being performed with respect to a surface direction so that the electrode faces the liquid chamber in a facing direction orthogonal to the surface direction, the positioning method comprising:
• taking an image of the opening of the liquid chamber;
• acquiring a position of a centroid of the liquid chamber in the surface direction based on the taken image of the opening;
• taking an image of the electrode;
• acquiring a position of a centroid of the electrode in the surface direction based on the taken image of the electrode;
• and
• positioning the channel forming member and the actuator unit based on the position of the centroid of the liquid chamber and the position of the centroid of the electrode so that the liquid chamber and the electrode has a positional relationship in the surface direction.