A new method of determining the minimum energy to form a drive bubble is presented. This
new method uses an on‐die drive bubble detect circuit to infer when the ink chamber is dry by
measuring the charge on the sensor plate in the chamber. The pen can be brought up to temperature,
and then fire a nozzle with various energy pulses to detect at what energy a drive bubble is formed. A
plot of the firing energy vs drive bubble detect signal is then used to infer the minimum energy to eject a
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INC, HP, "DETERMINE ENERGY REQUIRED TO FORM HEALTHY DRIVE BUBBLE", Technical Disclosure Commons, (August 13, 2021)