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Optical sensor and image forming apparatus configured to detect inside diffusely-reflected light
US9103717B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9103717-B2 |
| Application number | US-201313779949-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 28, 2013 |
| Priority date | Mar 1, 2012 |
| Publication date | Aug 11, 2015 |
| Grant date | Aug 11, 2015 |
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Abstract
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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.
First claim
Opening claim text (preview).
What is claimed is: 1. An optical sensor comprising: an irradiation system that emits 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, scattering occurring inside the object; a first light detection system that includes a first light detector placed on a light path of light emitted from the irradiation system and specularly reflected by the object; a second ligh…
Assignees
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Classifications
- G01N21/21Primary
Physics · mapped topic
- G01J1/0429Primary
Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
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Frequently asked questions
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- What does patent US9103717B2 cover?
- 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; a…
- Who is the assignee on this patent?
- Oba Yoshihiro, Sugawara Satoru, Ishii Toshihiro, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification G01N21/21. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Aug 11 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).