Medium transport device, image reading apparatus, and static electricity detection circuit detecting the static electricity of a sheet with an electrode, send the signal supplied from the electrode to a voltage clamp circuit, amplifier circuit and rectifier circuit in order to detect a medium
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United States of America Patent
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Oct 11, 2022
Grant Date -
Mar 4, 2021
app pub date -
Aug 26, 2020
filing date -
Aug 30, 2019
priority date (Note) -
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Abstract
A medium transport device includes a transport section transporting a medium in a contact manner, an electrode detecting static electricity charged on the medium, and a static electricity detection circuit. The static electricity detection circuit includes a voltage clamp circuit clamping a detection signal input from the electrode to a predetermined voltage, an amplifier circuit amplifying an output signal of the voltage clamp circuit, a rectifier circuit rectifying an output signal of the amplifier circuit, and a comparator circuit serving as a determination circuit determining whether the medium exists based on an output signal of the rectifier circuit.
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