Patent ID: 6217141
Filing Date: 2001-04-17
Classification: B41J

Abstract:
A method of driving a piezo-electric type ink jet head for changing a volume of ink particles to be jetted, said piezo-electric type ink jet head having a pressure chamber for reserving inks, a nozzle for jetting out the ink particles from said pressure chamber and a piezo-electric element for supplying said pressure chamber with a pressure for jetting out the ink particles, said method comprising, before jetting out each particle:a first step of driving said piezo-electric element so that a meniscus of inks is receded from an initial position of said nozzle to a first position within said nozzle;a second step of driving said piezo-electric element so that the meniscus advances from the first position to a second position within said nozzle, thereby changing a movement quantity of the meniscus from the first position to the second position in accordance with a particle size of the ink particles to be jetted; anda third step of driving said piezo-electric element so that the meniscus advances from the second position to the initial position more slowly than in the second step.