Optical sensor and image forming apparatus configured to detect inside diffusely-reflected light
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United States of America Patent
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Aug 11, 2015
Grant Date -
Sep 5, 2013
app pub date -
Feb 28, 2013
filing date -
Mar 1, 2012
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Abstract
An optical sensor includes an irradiation system emitting linearly polarized light of a first polarization direction toward a surface of an object from an incident direction inclined with respect to a normal to the surface; a first light detection system including a first light detector placed on a light path of light emitted from the irradiation system and specularly reflected by the object; and a second light detection system including a separation optical element placed on a light path of light diffusely reflected by the object, on a plane of incidence of the object, and extracting a linearly polarized light component of the first polarization direction included in the light diffusely reflected by the object, a second light detector receiving the linearly polarized light component of the first polarization direction extracted by the separation optical element and a third light detector receiving the light diffusely reflected by the object.
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