Image reading device and image forming apparatus
US7920304B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2009 |
| Grant date | Apr 5, 2011 |
| Priority date | — |
| Expiry date | Aug 6, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/02865
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image reading apparatus includes a plurality of light sources to illuminate a document; an illumination optical system to guide light to a reading target area having a length and a width; a document illuminating device to illuminate the entire document; an image forming optical system to form an image from light reflected from the document; and a sensor provided in an image forming section of the image forming optical system to read the image of the document. The illumination optical system includes a concentration section to control light diffusion, and a reflection section. The reflection section includes at least two integrally configured reflection surfaces, in which a sine value of an angle of reflected light from at least one reflection surface is positive, while a sine value of an angle of reflected light from the rest of at least one reflection surface is negative.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.