Patent ID: 7762646
Filing Date: 2010-07-27
Classification: B41J

Abstract:
1. A head substrate having a plurality of printing elements and a plurality of driving elements for driving the plurality of printing elements comprising: a first terminal, common to the plurality of printing elements, which receives a test signal for either one or more of the plurality of printing elements via a test select switch; a second terminal which receives a selection signal for selecting and driving at least some of the plurality of printing elements; and a bit select switch for inputting the selection signal; and a third terminal which outputs a potential of one end of each of the printing elements selected by the selection signal received by said second terminal in response to the test signal received by said first terminal, said one end being connected to a corresponding one of the driving elements; a fourth terminal which outputs a potential of the other end of each of the printing elements selected by the selection signal; wherein the plurality of printing elements is connected to a common power supply terminal, and both ends of each of the plurality of printing elements are respectively connected to the third terminal and the fourth terminal via the test select switch and the bit select switch.