发明名称 |
Operation device and image reading apparatus |
摘要 |
On a bottom surface of a light guide element of an operation device including a panel with a light-transmissive portion, a reflection portion is formed in a first region thereof, which is close to a light source, and a first diffusion surface is formed in a second region of the bottom surface of the light guide element, which is a region distant from the light source. A light-incident side of the light guide element is a non-diffusion surface. Sides other than the light-incident side are second diffusion surfaces. Light that has been emitted from the light source and incident to the light guide element via the light-incident side is totally reflected and is then guided to the first and the second diffusion surfaces and a part of diffusion-reflected light illuminates the light-transmissive portion of the panel. |
申请公布号 |
US8564848(B2) |
申请公布日期 |
2013.10.22 |
申请号 |
US201113074497 |
申请日期 |
2011.03.29 |
申请人 |
SHIMOYAMA NOBORU;OGUSHI HIROSHI;ISHIDA YASUSHI;CANON KABUSHIKI KAISHA |
发明人 |
SHIMOYAMA NOBORU;OGUSHI HIROSHI;ISHIDA YASUSHI |
分类号 |
H04N1/40;F21V7/04;G06F3/045;H04N1/04 |
主分类号 |
H04N1/40 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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