Patent ID: 8177329

Claim:
An ink jet print head comprising: a first nozzle through which a predetermined volume of ink is ejected; a second nozzle through which is ejected a volume of ink which is larger than the volume of ink ejected through the first nozzle, wherein each of the first nozzle and the second nozzle includes: an ink ejection port for ejecting ink, a bubbling chamber having an energy generation element which generates energy used for ejecting ink, the bubbling chamber being formed at a position corresponding to the ink ejection port, and an ink ejection port portion allowing the ejection port to communicate with the bubbling chamber, wherein each of the first nozzle and the second nozzle has the following relationship: an opening area, in a direction orthogonal to an ejection direction of ink, of the ejection port is equal to or smaller than an opening area, in the direction orthogonal to the ejection direction of ink, of the ejection port portion at the position where the ejection port portion and the bubbling chamber communicate with each other, and wherein a ratio of the opening area of the ejection port portion to the opening area of the ejection port in the first nozzle is greater than a ratio of the opening area of the ejection port portion to the opening area of the ejection port in the second nozzle.