Patent ID: 7240989

Claim:
A liquid discharging head comprising: at least one liquid chamber holding liquid; a nozzle provided for each liquid chamber; at least one pair of energy generating elements provided for each liquid chamber, and applying energy to the liquid held in the liquid chamber to discharge the liquid from the nozzle; a main control circuit connecting a series circuit of the at least one pair of energy generating elements to a power supply, and driving the at least one pair of energy generating elements according to the timing for discharging the liquid; a sub-control circuit connected to a connection midpoint between the at least one pair of energy generating elements, and varying the balance of energy generation between the at least one pair of energy generating elements; a first wiring pattern connecting the connection midpoint to the sub-control circuit; and second wiring patterns connecting the at least one pair of energy generating elements to the main control circuit, wherein, the first wiring pattern has a width narrower than the width of the second wiring pattern, and the sub-control circuit comprises a selector including a switch connected to the connection midpoint between the at least one pair of energy generating elements and selectively connectable to: (a) a first contact connected to a resistor and a power supply; (b) a second contact that is not connected to the power supply or to ground; and (c) a third contact connected to a resistor and ground, so that current flows from the sub-control circuit to the connection midpoint between the at least one pair of energy generating elements when the selector switch is connected to the first contact of said three contacts, current does not flow between the sub-control circuit and the connection midpoint between the at least one pair of energy generating elements when the selector switch is connected to the second contact of the three contacts, and current flows to the sub-control circuit from the connection midpoint between the at least one pair of energy generating elements when the selector switch is connected to the third contact of said three contacts is selected during operation of the liquid discharging head.