Illuminator and image reader employing it
US7591576B2 · kind B2 · utility
6Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 2, 2005 |
| Grant date | Sep 22, 2009 |
| Priority date | — |
| Expiry date | Apr 26, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0317
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An illuminator includes a light guide having a circular cross-section, a scatterer that is provided on a portion of the circumference of the circular cross-section and that radiates scattering light toward the inside of the light guide, and a condensing lens that condenses light emitted from the light guide and transforms the light into a linear beam, a planar beam, or a point-like beam. In the illuminator light from the light source is effectively utilized, and the light can efficiently illuminate the required illumination area. In addition, an image reader apparatus can perform high-speed reading using such an illuminator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.