Patent ID: 7273265
Filing Date: 2007-09-25
Classification: B41J

Abstract:
1. An ink jet recording method in which ink jet recording of an image on a recording medium is performed in an ink jet head, comprising: allowing an electrostatic force to act on ink prepared by dispersing charged particles containing colorants in a dispersion medium to form a thread of said ink; dividing said thread into ink droplets of said ink to eject said ink droplets toward said recording medium; and allowing said ink droplets to be landed onto said recording medium moving relatively to said ink jet head to form an image dot on said recording medium, wherein, when a speed at which said recording medium and an ejection portion of said ink jet head for ejecting said ink droplets move relatively is referred to as “v”, a division frequency of said thread is referred to as “f”, and a diameter of said thread is referred to as “d”, the following expression is satisfied:  where “a” is a coefficient determined by a density, a surface tension and a viscosity of said ink, as well as a flying droplet diameter and a flying speed of each of said ink droplets of said ink.