System for sensing ink level and type of ink for an ink jet prin

Details System for sensing ink level and type of ink for an ink jet prin System for sensing ink level and type of ink for an ink jet prin

1995-12-18

1997-10-28

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

73304C, B41J 2195, G01F 2300

Patent

active

056821840

ABSTRACT:
A capacitor is created in an ink tank supplying ink to an ink jet printhead by placing parallel capacitive plates on sides of the tank with the ink therebetween acting as the capacitor dielectric. An electrical AC potential is applied across the capacitor. Changes in current flow through the plates are detected in a phase sensitive bridge circuit and digital signals are generated and sent to a processor for conversion into low ink level signals. The output signal is also used to identify a particular type of ink by either comparing points on a characteristic curve of the ink volume verses capacitance or, in a second embodiment, by periodically sweeping an applied oscillator voltage over a selected frequency range and comparing measured electrical resonance parameters for the ink tank capacitor with stored information about resonance parameters for different types of ink.

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