Patent ID: 7837304

Claim:
A liquid discharge device having a liquid discharge head in which a plurality of liquid discharge portions are arrayed on a substrate, each of said liquid discharge portions comprising: a liquid chamber for storing a liquid to be discharged, ejection force supplying means disposed within said liquid chamber, for providing the liquid within said liquid chamber with ejection force, and a nozzle for discharging the liquid stored in said liquid chamber by actions of said ejection force supplying means, said liquid discharge device further comprising: individual channels, separated by barrier walls, provided for each of said liquid discharge portions so as to communicate with said respective liquid chamber and supply liquid to said respective liquid chamber, and a contiguous common channel disposed across each of said plurality of individual channels so as to communicate with each of said plurality of individual channels and for supplying liquid to said plurality of individual channels; said contiguous common channel being comprised of: a first common channel portion provided at a liquid supply source side, and a second common channel portion provided between said first common channel portion and said individual channels, and having liquid channel resistance greater than that of said first common channel portion, and further wherein the second common channel portion is in direct fluid communication with the individual channels, and the second common channel receives ink directly from the first common channel portion, wherein said second common channel portion is formed such that the channel resistance as to the movement direction of liquid to the plurality of individual channels with which said second common channel portion communicates is substantially constant.