| 发明名称 | Optical sensor and image forming apparatus | ||
| 摘要 | An optical sensor is disclosed. The optical sensor includes an irradiating system which irradiates a linearly polarized light; a first photodetecting system including a first photodetector which is arranged on an optical path of a light which is specularly reflected from a subject; a second photodetecting system including an optical element which is arranged on an optical path of a light which is diffuse reflected from the subject within an incident face in the subject and which separates a linearly polarized component in a second polarizing direction which is orthogonal to a first polarizing direction and a second photodetector which receives a light separated by the optical element, wherein an angle of taking in the light in the first photodetector and an angle of taking in the light in the second photodetector are mutually different. | ||
| 申请公布号 | US8971749(B2) | 申请公布日期 | 2015.03.03 |
| 申请号 | US201313768265 | 申请日期 | 2013.02.15 |
| 申请人 | Ricoh Company, Ltd. | 发明人 | Oba Yoshihiro;Sugawara Satoru;Ishii Toshihiro;Hoshi Fumikazu |
| 分类号 | G03G15/00;G01N21/47;G01N21/55;G03G13/00 | 主分类号 | G03G15/00 |
| 代理机构 | Cooper & Dunham LLP | 代理人 | Cooper & Dunham LLP |
| 主权项 | 1. An optical sensor, comprising: an irradiating system which irradiates, toward a surface of a subject, a linearly polarized light in a first polarization direction from an incident direction which is slanted relative to a normal direction of the surface; a first photodetecting system including a first photodetector which is arranged on an optical path of a light which is specularly reflected from the subject; a second photodetecting system including an optical element which is arranged on an optical path of a light which is diffuse reflected from the subject within an incident face in the subject and which separates a linearly polarized component in a second polarizing direction which is orthogonal to the first polarizing direction and a second photodetector which receives a light separated by the optical element, wherein an angle of taking in the light in the first photodetector and an angle of taking in the light in the second photodetector are mutually different, wherein an angle of taking in light of a photodetector is an angle formed by a light receiving region of the photodetector and a center of an illuminated area at the surface of the subject. | ||
| 地址 | Tokyo JP | ||