Patent ID: 8162446

Claim:
A print head comprising: a plurality of ejection ports through which ink is ejected, electrothermal transducing elements generating heat when energized to be utilized to eject the ink through the ejection port, energy acting chambers in which the electrothermal transducing elements are disposed, and channels through which the ink is introduced into the energy acting chambers, and an ink supply port that is in communication with the channels, wherein the print head includes a first channel that is relatively long, a first ejection port that is in communication with the first channel, a first electrothermal transducing element disposed at a location corresponding to the first ejection port, a second channel that is relatively short, a second ejection port that is in communication with the second channel, and a second electrothermal transducing element disposed at a location corresponding to the second ejection port, the first channel and the second channel are disposed along one side of the ink supply port, an area of the first electrothermal transducing element is smaller than that of the second electrothermal transducing element, and an aspect ratio of each of the electrothermal transducing elements is obtained by dividing a dimension of the electrothermal transducing element in a direction orthogonal to a direction in which the plurality of ejection ports are arranged by a dimension of the electrothermal transducing element in the direction in which the plurality of ejection ports are arranged, and the aspect ratio of the first electrothermal transducing element is greater than that of the second electrothermal transducing element.