Illumination system, image reader and image forming device
US8928956B2 · kind B2 · utility
2Cited by
9References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2013 |
| Grant date | Jan 6, 2015 |
| Priority date | — |
| Expiry date | Feb 25, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0082
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An illumination system includes a light source unit including light emitting elements arranged in array in a main scan direction to project light beams radially, and an optical guide of a long length made from a translucent material to guide incident beams from an exit surface of the light source unit in a certain direction for output, and including at least one surface with a diffuse structure to diffuse a transmitted beam or a reflected beam among the incident beams, wherein the diffuse structure is configured to diffuse the beam at a center at a larger divergence angle than at ends in the main scan direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.