Printhead, head cartridge having said printhead, printing apparatus using said printhead and printhead element substrate
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United States of America Patent
Stats
-
Nov 30, 2004
Grant Date -
Jan 2, 2003
app pub date -
Jun 14, 2002
filing date -
Jun 15, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A printhead has a plurality of printing elements and a drive circuit for driving the printing elements aligned in a predetermined direction on an element board. The printhead is provided with a Schmitt trigger having hysteresis properties that give different threshold values to the rising and falling edges of a waveform of a logic signal (HE, LT, CLK, DATA) input into the drive circuit. The Schmitt trigger is provided with means for adjusting the length of the delay at the rising and falling edges of the input waveform signal, so that the speed of data transmission to the printhead can be increased even as the supply voltage is lowered.
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