Medium speed detection device and printing apparatus
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United States of America Patent
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Aug 27, 2019
Grant Date -
Mar 2, 2017
app pub date -
Aug 29, 2016
filing date -
Sep 1, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A medium speed detection device includes a radiation optical system that radiates non-coherent light to a sheet-shaped medium which is being transported, a linear light reception optical system that includes n light reception units (where n is an integer equal to or greater than 2) receiving diffused/reflected light of the non-coherent light from the medium through light reception surfaces and in which the n light reception surfaces are arranged on an imaginary straight line in a transport direction of the medium, and a speed detection unit that obtains a speed of the medium based on a delay time obtained from a temporal correlation between an output of preceding light reception units with preceding light reception surfaces disposed on an upstream side in the transport direction and an output of following light reception units with following light reception surfaces disposed on a downstream side among the n light reception units.
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