Patent ID: 6224197
Filing Date: 2001-05-01
Classification: B41J

Abstract:
A liquid jet recording head, comprising:a base plate having a flat surface;a plurality of ejection outlets for ejecting a liquid;a plurality of liquid passages in fluid communication with said ejection outlets so as to supply the liquid to said ejection outlets, each said liquid passage having a height, and a bottom;an ink supply port in fluid communication with said liquid passages so as to supply the liquid to said liquid passages; anda plurality of electrothermal transducers for generating thermal energy for ejecting the liquid, said electrothermal transducers being disposed on the flat surface of the base plate so that the flat surface serves as a bottom of each said liquid passages, respectively,wherein each said liquid passage is shaped such that in a first region from an end of the electrothermal transducer near the ejection outlet to the ejection outlet, the height of the liquid passage gradually decrease toward said ejection outlet, and in a second region from an end to the electrothermal transducer near the ink supply port to the ink supply port, the height of the liquid passage gradually decrease toward the ink supply port.