Patent ID: 9216575
Filing Date: 2015-12-22
Classification: B41J

Abstract:
1. A recording-element substrate comprising: an ejection port configured to eject liquid; a heating resistance element configured to generate thermal energy for ejecting the liquid from the ejection port; and a drive circuit configured to drive the heating resistance element, wherein the heating resistance element includes a heating resistor layer and three or more electrodes provided for the heating resistor layer; the drive circuit forms a heating area that generates thermal energy in the heating resistor layer by selectively using at least two of the three or more electrodes and changes an area in which the heating area is formed depending on the electrodes used; and the three or more electrodes include a plurality of first electrodes that allow an electric current to flow through a first area and a plurality of second electrodes that allow an electric current to flow through a second area adjacent to the first area, a center of the first area coinciding with a center of an area including the first area and the second area.