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US 7,350,891 B2Granted
Liquid discharge head
AssigneeCanon Kabushiki Kaisha
InventorsMasanobu Oomura, Fumio Murooka
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AssigneeCanon Kabushiki Kaisha
InventorsMasanobu Oomura, Fumio Murooka
Estimating the term…
The liquid discharge head has a heater resistor for heating liquid in a liquid route communicating with a discharge port and generating bubbles and a switch circuit for switching on/off the current to be supplied to the heater resistor. One end of the heater resistor is connected to a power-supply potential, one end of the switch circuit is connected to a ground potential, and the other end of the heater resistor and the other end of the switch circuit are connected to each other. The liquid discharge head has a detection circuit for detecting the voltage of the connection point between the heater resistor and the switch circuit and outputting an output signal when a predetermined change occurs in the voltage, and a switch control circuit for controlling the switching on/off of the switch circuit in accordance with the output signal.
A liquid discharge head in which an electrothermal transducer and a switch circuit are electrically connected in series between a first power supply and a second power supply to perform discharge control of liquid in accordance with the control of energy injection to the electrothermal transducer by the switch circuit, comprising:
Dependencies are inferred from the claim text.