HP INCFollow


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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Creative Commons License
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