Patent ID: 7530674
Filing Date: 2009-05-12
Classification: B41J

Abstract:
1. A liquid ejection head, comprising: a plurality of nozzles through which liquid is ejected; a plurality of pressure chambers which accumulate the liquid to be supplied to the nozzles; a plurality of pressure generating devices which apply pressure to the liquid inside the pressure chambers to eject the liquid through the nozzles; a common flow channel through which the liquid is supplied to the pressure chambers; and a wall which defines the common flow channel, at least a portion of the wall being composed of at least two layers including first and second members, a first surface of the first member coming in contact with the liquid in the common flow channel, the second member being arranged on a second surface of the first member reverse to the first surface, wherein: the first member has a thickness L which satisfies the following condition:  where λ is a wavelength of an acoustic wave traveling through the first member, and n is an integer not smaller than zero; and an acoustic impedance Z