| 摘要 |
PROBLEM TO BE SOLVED: To discharge a high-viscosity ink at high frequency in a liquid discharge head. SOLUTION: In the liquid discharge head equipped with: a nozzle for discharging a liquid droplet formed in a nozzle plate; a liquid chamber communicating with the nozzle; and a pressure generating means, a region formed to a nozzle diameterϕ1 on the side of discharging a liquid from the nozzle, and a region formed to a nozzle diameterϕ2 on the side of feeding the liquid from the liquid chamber, are provided. The nozzle diameterϕ2 on the side of feeding the liquid, is 2.5 times or more to 5 times or less the nozzle diameterϕ1 on the side of discharging the liquid. Further, the surface, in contact with the atmosphere, of the nozzle plate and the surface of the region of the nozzle diameterϕ1 inside the nozzle, are formed of a liquid repellent surface. On the other hand, the surface of the region other than the nozzle diameterϕ1 inside the nozzle, is formed of a lyophilic surface. When the discharging of the liquid droplet from the nozzle is initiated, the force to be applied to the liquid inside the liquid chamber by the pressure generating means, works only in the direction where the volume inside the liquid chamber shrinks. COPYRIGHT: (C)2008,JPO&INPIT
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