Incremental printing of symbolic information – Ink jet – Controller
Reexamination Certificate
2005-05-10
2005-05-10
Nguyen, Lamson (Department: 2853)
Incremental printing of symbolic information
Ink jet
Controller
C327S106000, C341S147000
Reexamination Certificate
active
06890046
ABSTRACT:
The present invention provides a technique that prevents a shift of a driving waveform due to accumulation of errors in a process of generating the driving waveform to drive driving elements on a print head. The technique of the present invention successively sums up a plurality of gradient data at a preset calculation period to give a result of summation and carries out digital-to-analog (D-A) conversion with regard to only specific upper columns in the result of summation in synchronism with the preset calculation period, so as to generate a driving waveform. Each gradient data represents a local gradient of the driving waveform and is stored in a memory. In the process of generating the driving waveform, the technique of the present invention corrects the result of summation to a preset value under a predetermined condition. One preferable embodiment clears specific lower bits in the result of summation in synchronism with a floor signal. Another preferable embodiment forcibly corrects the result of summation to an upper limit value or a lower limit value of a preset range when the result of summation exceeds the preset range. Such correction effectively cancels the potential effects of cumulative error on the driving waveform.
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Asauchi Noboru
Fukano Takakazu
Katayama Toshihiko
Nishihara Yuichi
Tamura Noboru
Mouttet Blaise
Nguyen Lamson
Seiko Epson Corporation
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