Patent ID: 9630405
Date: 2017-04-25
CPC Classifications: B41J

Claim:
1. A printing element substrate comprising: a plurality of ejection openings for ejecting liquid; a plurality of temperature detection elements provided along the ejection openings; heating resistor elements for generating energy for ejecting ink through the ejection openings and being provided to correspond to the ejection openings; and liquid supply openings for supplying liquid to the ejection openings, wherein the ejection openings and the heating resistor elements are provided along the liquid supply openings, wherein the temperature detection elements form a column, wherein the heating resistor elements are provided between the column of the temperature detection elements and the liquid supply openings, and wherein the temperature detection elements are arranged at a higher density during an operation for ejecting ink through the ejection openings in a part having a higher temperature change of the printing element substrate.