Patent ID: 7036909
Filing Date: 2006-05-02
Classification: B41J

Abstract:
1. A liquid ejection head comprising: a plurality of ejection energy generation elements for generating energy for ejecting liquid droplets; an element substrate on which the plurality of ejection energy generation elements are disposed; and a nozzle forming member laminated on the main surface of the element substrate and including a plurality of nozzles each having an ejection port for ejecting the liquid droplets, a bubble forming chamber in which bubbles are formed by a respective one of said ejection energy generation elements, and a supply path for supplying the liquid from a supply chamber to the bubble forming chamber, wherein the nozzle forming member has a protrusion, which reduces the height of a portion of each nozzle with respect to the main surface of the element substrate in the nozzle, in the vicinity of the respective ejection energy generation element on the supply path side thereof, and the height of each nozzle changes between the protrusion and the supply chamber, wherein each bubble forming chamber has an ejection portion continuing from the corresponding ejection port and an element portion which contains the respective ejection energy generation element and extends from the ejection portion to the corresponding supply path, and wherein each ejection portion has a portion where an area of a cross-section thereof which is parallel to the main surface of the element substrate is reduced in an ejecting direction, and the reduced portion of the ejection portion has a surface which is parallel to the main surface of the element substrate.