| 摘要 |
PURPOSE:To reduce the number of component parts and prevent clogging with air bubbles from occurring, by forming a joint part in a body with a substrate provided with a groove part for constituting a passage, or with a second substrate to be laminated with the above substrate to constitute the passage. CONSTITUTION:An ink jet head comprises a substrate 1, which is provided with groove parts for constituting passages, namely, a common supplying passage 10, discrete supplying passages 9, pressurizing chambers 8 and nozzles 7, a second substrate 2 to be laminated with the substrate 1 to constitute closed passages, piezoelectric elements 4 disposed correspondingly to the pressurizing chambers 8, respectively, and a metallic plate 3 serving as a common electrode plate. The substrate 1 is provided integrally with a joint part 5, which is provided in the shape of a hollow cylinder where it is to be connected to a tube or the like. Thus, the number of component parts such as separate joint parts, seal packings and screws can be reduced, and the interior of the joint part is formed in a smooth stepless form, so that defective printing can be prevented from occurring due to catching of an air bubble in the joint part, growth of the bubble with a temperature variation or the like and entering of the bubble into the pressurizing chamber, or the like. |
