Liquid discharge head and liquid discharge apparatus
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United States of America Patent
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-
Sep 16, 2014
Grant Date -
Oct 4, 2012
app pub date -
Mar 16, 2012
filing date -
Mar 31, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A liquid discharge head includes a signal processing circuit which operates with a first voltage, and generates a discharge control signal, a liquid driving circuit including an electrothermal transducer, a driving element which drives the electrothermal transducer, and a control circuit which receives the discharge control signal and outputs, to the driving element, a driving signal having a second voltage higher than the first voltage, and a monitoring circuit which monitors the first voltage and outputs a stop signal upon a drop of the first voltage. The control circuit stops driving the electrothermal transducer by the driving element in accordance with the stop signal. The monitoring circuit includes a transistor including a drain connected to power supply voltage node through a step-down circuit, a source connected to ground side, and a gate receiving the first voltage.
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