Patent ID: 7399688
Filing Date: 2008-07-15
Classification: B41M,C09D,G02F,H05K,Y10T

Abstract:
1. An identification code drawing method of drawing an identification code on a substrate, comprising: cleaning the substrate by using a cleaning unit; performing lyophobization for the substrate; discharging liquid droplets of functional liquid, into which particles of metal or metal oxide are dispersed, from nozzles of a first liquid droplet discharging head onto a region of the substrate having been subjected to the lyophobization, on the basis of liquid droplet discharge data for drawing the identification code; and heating the liquid droplets adhered on the substrate by using a heating unit or drying the liquid droplets adhered on the substrate by using a drying unit wherein, in the lyophobization, liquid repellent agent is discharged onto the substrate by a liquid repellent agent discharging unit so as to make the substrate be lyophobic; the liquid repellent agent discharging unit is a second liquid droplet discharging head having a nozzle and a piezoelectric element, and in the lyophobization, the piezoelectric element is driven to discharge liquid droplets of the liquid repellent agent from the nozzle of the second liquid droplet discharging head onto a cleaned region of the substrate.