Patent ID: 8070263
Filing Date: 2011-12-06
Classification: B41J

Abstract:
1. A printing head substrate comprising: a board; a first array provided with a plurality of heating elements generating energy used for ejecting ink from ejection openings on a surface of the board; a second array provided with a plurality of heating elements generating energy used for ejecting the ink from ejection openings on the surface; a plurality of ink supply openings for supplying ink to the plurality of heating elements, the plurality of ink supply openings penetrating the surface and a back side of the board and being arranged along the first array and the second array at a region between the first array and the second array; a first drive transistor circuit for driving the heating elements of the first array; a second drive transistor circuit for driving the heating elements of the second array; a substrate temperature detecting element for detecting a temperature of the printing head substrate on the board between ink supply openings; a pair of pads for carrying out reception and supply of a signal between a printing apparatus and the substrate temperature detecting element on the surface; a first conductive line connecting the substrate temperature detecting element and one of the pair of pads; and a second conductive line connecting the substrate temperature detecting element and another of the pair of pads; wherein the first conductive line is provided on the board between the ink supply openings and the first array and the second conductive line is provided on the board between the ink supply openings and the second array.