Patent ID: 6164748
Filing Date: 2000-12-26
Classification: B41J

Abstract:
A liquid discharge method for a liquid jet head provided with first discharge openings, a first liquid flow path conductively connected with each of said first discharge openings, first energy generating devices for generating energy for the discharge of liquid droplets from said first discharge openings, second discharge openings, a second liquid flow path conductively connected with each of said second discharge openings, and second energy generating devices for generating energy for the discharge of liquid droplets from said second discharge openings, the method comprising the steps of:preceding the discharge of the first liquid droplet from said discharge opening at a first discharge speed v.sub.1, discharging the second liquid droplet from said second discharge opening at a second discharge speed v.sub.2 smaller than said first discharge speed, andbefore each of said liquid droplets are impacted on an object, causing said first liquid droplet and said second liquid droplet to collide with each other to be combined,wherein the discharge time differential .delta.T between said first liquid droplet and said second liquid droplet is controlled to satisfy the following condition: ##EQU9## where the L.sub.1 is the distance between a center of the first discharge opening and that of the second discharge opening; the r.sub.1 and r.sub.2 are the radii of the ink droplets discharged from the first and second discharge openings, respectively; the .theta..sub.1 and .theta..sub.2 are the angles of (.theta..degree..ltoreq..theta..sub.1 <.theta..sub.2 <90.degree.) formed by each of central axes of the first and second discharge openings to the perpendiculars to the discharge opening surface, and max (a, b) is a function for providing a maximum value of a and b.