Printhead having protection circuit, and printing apparatus using the printhead
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United States of America Patent
Stats
-
Sep 20, 2005
Grant Date -
Mar 6, 2003
app pub date -
Aug 27, 2002
filing date -
Aug 31, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A printhead is provided with a protection circuit protecting the printing element, in order to achieve a high electrostatic tolerance, in particular, an improved tolerance to electric insulation breakdown in an interlayer film. The protection circuit is formed between a signal input pad of the printing element and an inverter connected to a driving circuit. The protection circuit includes two pairs of diodes. A resistance is provided between the two pairs of diodes. Each pair of diodes enables quick dissipation of a high-voltage electrostatic surge, applied to the printhead, to a power supply or base line having a large capacity. A printing apparatus employing the printhead is also provided.
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