Ink jet print head identification circuit with programmed transi

Details Ink jet print head identification circuit with programmed transi Ink jet print head identification circuit with programmed transi

1995-09-27

1998-05-26

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 49, B41J 29393, B41J 214, B41J 216

Patent

active

057573948

ABSTRACT:
An ink jet print head identification system for providing print head identifying information to the electronics of an ink jet printer includes one or more programmable drain transistors integrated onto a print head chip. Existing address lines that interconnect the printer electronics and print head electronics are used to serially read the digital contents of each programmed transistor. The printer electronics reads each bit by combinationally applying a pull up voltage on two of the address lines while pulling down the voltage on one address line. If the drain of the transistor being read is programmed as an electrically conducting short, then the transistor will turn on and the voltage level on one of the pulled up address lines will not reach a logic high. If the drain is programmed as a non-conducting gap, the transistor will not conduct and the voltage level on both pulled up lines reach a logic high. The printer electronics detects whether the voltage level on both lines is a logic high and accordingly determines the digital contents of the identification circuit. After each bit has been read, the printer electronics determines print head identifying information based on the bit pattern that was retrieved from the identification circuit.

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"Integrating the Printhead into the HP DeskJet Printer" by J. Paul Harmon and John A. Widder; Hewlett-Packard Journal, Oct. 1988; pp.62-66.

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