Patent ID: 7052119
Filing Date: 2006-05-30
Classification: B41J

Abstract:
1. A liquid ejection head, comprising: a chamber formation plate, having a first face formed with a plurality of recesses arranged in a first direction at a fixed pitch, such that each of the recesses is communicated with, via a through hole, a second face which is an opposite face of the first face, the chamber formation plate comprised of nickel; a sealing plate, joined to the first face of the chamber formation plate so as to seal the recesses to form a plurality of pressure generating chambers; and a metallic nozzle plate, formed with a plurality of nozzles, and joined to the second face of the chamber formation plate such that each of the nozzles is communicated with associated one of the pressure generating chamber via the through hole, wherein a ratio of a grain size of a crystal of the nickel with respect to a thickness of a partition wall defined between each adjacent ones of the recesses is 60% or less.