Incremental printing of symbolic information – Ink jet – Controller
Reexamination Certificate
2007-11-06
2007-11-06
Luu, Matthew (Department: 2861)
Incremental printing of symbolic information
Ink jet
Controller
C347S010000, C347S011000
Reexamination Certificate
active
10896074
ABSTRACT:
A printhead driving method in a power source device to output a printhead driving voltage, for generating an optimum voltage for a characteristic of the printhead attached to a printing apparatus, without controlling an output voltage with high accuracy. The printhead is provided with a reference voltage source to set an output voltage of a head driving power source. A head driving power circuit incorporated in the printing apparatus compares a value obtained by dividing the reference voltage with a value obtained by dividing the output voltage from the power circuit and performs control so as to eliminate an error. Further, the printhead is provided with a non-volatile memory, and data to supply driving energy to optimize a discharge characteristic of the printhead is obtained upon final test of manufacturing process by using a test device having a similar construction to that of the head driving power circuit incorporated in the printing apparatus. The data is written into the non-volatile memory. When the printhead is attached to the printing apparatus, the data is read from the memory and a driving pulse used in actual printing is determined based on the data.
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Goldberg Brian J.
Luu Matthew
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