Printhead nucleation detection using thermal response

Details Printhead nucleation detection using thermal response Printhead nucleation detection using thermal response

2011-07-12

2011-07-12

Tran, Huan H (Department: 2861)

Incremental printing of symbolic information

Ink jet

Controller

C347S011000

Reexamination Certificate

active

07976115

ABSTRACT:
A method for determining the pulse width for driving printhead nozzles in a thermal inkjet printer. The printhead is preheated to a desired temperature during a maintenance mode. The printhead nozzle heaters are successively driven in respective heating intervals, where each successive heating interval is characterized by shorter drive pulse width pulses occurring at a higher pulse frequency. The printhead temperature data received during each heating interval is processed to determine a respective temperature slope. The temperature slopes are compared to a desired threshold temperature slope, and when a match is found, the pulse width associated with the matched temperature slope is used to drive the nozzle heaters during subsequent printer operations to print characters on a print medium.

REFERENCES:
patent: 5418558 (1995-05-01), Hock et al.
patent: 5428376 (1995-06-01), Wade et al.
patent: 6820958 (2004-11-01), Miyakoshi

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