Illumination device for an optical system of a reader apparatus
US10922506B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 2018 |
| Grant date | Feb 16, 2021 |
| Priority date | — |
| Expiry date | May 17, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10742
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An illumination device for an optical system of a reader apparatus, comprising a light source (3) disposed concentrically around an annular hollow body (2), an external light reflector (5) for redirecting light to illuminate a zone at its distal end (5b), and a reflector element (8) with a mirror finish outer surface (8a). The internal wall (6) of the external light reflector (5) is made of reflective material, having a first portion (6a) with increasing cross sections from a proximal end (5a) to a first region (6b) with maximum cross section, and a second portion (6c) with decreasing cross sections from the first region (6b) to a second region (6d) with minimum cross section. The reflector element (8) is arranged in front of the light source (3) to redirect light towards the first portion (6a) of the external light reflector (5). The illumination device (1) achieves, in a reduced space, high optical efficiency and uniform illumination on the mark to read, avoiding specular reflection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.