US 7,585,059 B2
Ink jet head and production method therefor
Tomoyuki Sagara, Sakura (Japan); and Yoshinori Nakajima, Nara (Japan)
Assigned to Sharp Kabushiki Kaisha, Osaka (Japan)
Appl. No. 11/667,811
PCT Filed Nov. 16, 2005, PCT No. PCT/JP2005/021054
§ 371(c)(1), (2), (4) Date May 15, 2007,
PCT Pub. No. WO2006/054609, PCT Pub. Date May 26, 2006.
Claims priority of application No. 2004-332025 (JP), filed on Nov. 16, 2004.
Prior Publication US 2008/0100665 A1, May 01, 2008
Int. Cl. B41J 2/045 (2006.01)
U.S. Cl. 347—68  [347/47; 347/65] 7 Claims
OG exemplary drawing
 
1. An ink jet head comprising:
a piezoelectric board having a plurality of elongated channels arranged parallel to each other and isolated from each other by channel walls; and
a nozzle plate having a plurality of nozzle holes provided in association with the channels, and bonded onto the piezoelectric board with the nozzle holes located at generally longitudinally middle positions of the respective channels;
wherein the nozzle plate has trench-like recesses each having a predetermined width and a predetermined depth and extending perpendicularly to the channels as being spaced equidistantly from the nozzle holes longitudinally of the channels;
gaps for communication between adjacent channels are defined by the recesses between a surface of the nozzle plate and upper face portions of the channel walls located equidistantly from the nozzle holes; and
active areas contributable to ink ejection are defined in each of the channels on opposite sides of the corresponding nozzle hole along the channel.