Printhead board, printhead, and printing apparatus

摘要

A board for a printhead mountable on a printing apparatus includes three terminals used for connection to the printing apparatus, a printing element, a driving circuit connected to the first terminal, an inspection circuit connected between the first terminal and the second terminal, and a resistance element connected between the second terminal and the third terminal. When an inspection signal is supplied from the printing apparatus to the first terminal, the inspection circuit outputs an output signal according to the inspection signal. When a control signal for performing printing is supplied from the printing apparatus to the first terminal, the driving circuit drives the printing element according to the control signal, and the inspection circuit sets the inspection circuit and the second terminal in an open state with each other.

主权项

1. A board for a printhead mountable on a printing apparatus, comprising:
a first terminal, a second terminal, and a third terminal, which are used for connection to the printing apparatus; a printing element configured to discharge a liquid; a driving circuit connected to said first terminal; an inspection circuit having an input node connected to said first terminal and an output node connected to said second terminal; and a resistance element having a first node connected to said third terminal and a second node connected to an electrical path between the output node of said inspection circuit and said second terminal, wherein when an inspection signal for inspecting a connection sate between the printing apparatus and the printhead is supplied from the printing apparatus to said first terminal, said inspection circuit outputs signal according to the inspection signal from said second terminal, and, when a control signal for performing printing is supplied from the printing apparatus to said first terminal, said driving circuit drives said printing element according to the control signal, and said inspection circuit sets said inspection circuit and said second terminal in an open state with each other.