Patent ID: 9434160
Filing Date: 2016-09-06
CPC Classification: B41J

Claim Text:
1. A recording head for ink jet recording, comprising: a nozzle array including a plurality of nozzle flow paths partitioned by nozzle walls; a plurality of ink ejection orifices communicating with the plurality of nozzle flow paths, respectively; heaters for ink ejection disposed in the plurality of nozzle flow paths, respectively; and ink for ink jet recording, with which an internal space of the recording head communicating with the plurality of ink ejection orifices is filled, the ink containing a coloring material, an acetylene glycol-based surfactant, and water, the acetylene glycol-based surfactant containing at least an ethylene oxide adduct of the acetylene glycol, an average addition number of moles of ethylene oxide of a whole of the acetylene glycol-based surfactant being 3 or more and 7 or less, the ink having a viscosity of 1.5 mPa·s or more and 3.0 mPa·s or less, wherein the recording head comprises a line type head having an opening area of each of the plurality of ink ejection orifices of 100 μm