US Patent 10960665 Element substrate, printhead, and printing apparatus

An element substrate provided in a printhead includes a heater configured to heat ink and discharge the ink from a nozzle, a temperature sensor provided in correspondence with the heater, an electric current source configured to energize the temperature sensor with an electric current based on an electric current value specified by an externally input first signal, and a determination circuit configured to determine an ink discharge status of the nozzle based on a voltage output from the temperature sensor energized with the electric current and a threshold voltage specified by an externally input second signal, and output a determination result signal.