Patent ID: 7618130
Filing Date: 2009-11-17
Classification: B41J

Abstract:
1. A liquid jet head comprising: a passage-forming substrate in which a plurality of pressure generating chambers communicating with nozzle orifices are arranged; piezoelectric elements which are provided on the passage-forming substrate with a vibration plate interposed therebetween and each of which includes a lower electrode, a piezoelectric layer and an upper electrode; and a reservoir forming plate which is joined with a surface of the passage-forming substrate at the piezoelectric element side and has a reservoir portion provided therein, the reservoir portion constituting a part of a reservoir that is a common liquid chamber of the respective pressure generating chambers, wherein the reservoir is formed of the reservoir port ion and a communicating portion provided in the passage-forming substrate, partitions at both sides in a width direction of the pressure generating chambers are provided to extend to the vicinity of an end of the reservoir portion at the pressure generating chamber side and thus liquid supply paths, each of which communicates with each of the pressure generating chambers and has a width smaller than that of the pressure generating chamber, and communicating paths, each of which allows the liquid supply path and the communicating portion to communicate with each other and has a width larger than that of the liquid supply path, are provided while being separated for each of the pressure generating chambers by the partitions, and wherein a distance between an end of each of the partitions at the reservoir portion side and the reservoir portion is shorter than the thickness of the passage-forming substrate.