Illuminating unit having diffusion means
US6858837B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 2002 |
| Grant date | Feb 22, 2005 |
| Priority date | — |
| Expiry date | Sep 30, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/03145
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed an image reading apparatus constructed by an illuminating unit for illuminating an object in a line shape, an image forming optical system for forming a light, as an image, from the object illuminated by the illuminating unit, a line sensor for converting the light formed as an image by the image forming optical system into an image signal, and a frame for holding the illuminating unit and the line sensor, wherein a shape in which vertices of at least a part of the cross section of the illuminating unit are connected by straight lines is set to a polygon of a pentagon or more, so that an image can be stably read at a high quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.