Rotation detecting unit, sheet feeding device and image forming apparatus
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United States of America Patent
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Sep 12, 2017
Grant Date -
Mar 16, 2017
app pub date -
Sep 6, 2016
filing date -
Sep 11, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A rotation detecting unit includes a light emitting device, a light receiving device, an output device, a rotatable plate, and a discriminating device. The rotatable plate includes a first portion and a second portion which are alternately provided along a circumferential direction, a third portion provided between the first portion and the second portion, and a fourth portion provided between the second portion and the first portion. When a region of the first portion is irradiated with light emitted from the light emitting device and received by the light receiving device, received light quantity of the light receiving device is a maximum. When a region of the second portion is irradiated with the light, the received light quantity is a minimum. When the third or fourth portion is irradiated with the light, the received light quantity is larger than the minimum and is smaller than the maximum.
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