US Patent 7585051 Liquid ejection head

A liquid ejection head includes ejection ports ejecting as droplets a solution containing colorant particles dispersed therein and a device that makes uniform ejection of the solution from respective ejection channels in an ejection channel region where the ejection ports are arranged. A liquid ejection head of electrostatic type makes an electrostatic force to act on the solution containing charged particles dispersed therein as the colorant particles to eject the droplets.