Light wedge for illuminating a platen in a print scanner
US6867850B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2003 |
| Grant date | Mar 15, 2005 |
| Priority date | — |
| Expiry date | Apr 9, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/145
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Light wedges that reflect light internally and produce diffuse light for uniformly illuminating a platen in a print scanner are presented. In one example, a light wedge has a first surface that receives light emitted from an illumination source and a second surface that limits specular reflections. The light wedge transmits light from the illumination source toward the platen, whereby uniform illumination is provided to the platen. In another example, a light wedge has an illumination surface that receives light emitted from the illumination source, a first surface that limits specular reflections, and a second surface that acts as a diffuser. The second surface reflects light out of the light wedge toward the platen, whereby uniform illumination is provided to the platen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.