Document reader having an optical filter with variable light transmission
US12381990B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 2022 |
| Grant date | Aug 5, 2025 |
| Priority date | — |
| Expiry date | Mar 16, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/195
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A document reader system configured to capture an image of a document is described. The document reader system includes a document reader having a transparent scan area, a light source, an optical filter, and an image sensor. The transparent scan area is configured to receive the document on a first side of the transparent scan area. The light source is positioned on a second side of the transparent scan area opposite the first side and is configured to emit light towards the transparent scan area. The optical filter is positioned between the light source and the transparent scan area and has a variable light transmission configured to modify light intensity of the light emitted by the light source. The image sensor positioned on the second side of the transparent scan area and configured to capture the image of the document on the first side of the transparent scan area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.