Method and apparatus for optically reading information from object based on control of optical path length
US7306151B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2004 |
| Grant date | Dec 11, 2007 |
| Priority date | — |
| Expiry date | Feb 2, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10702
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical information reading apparatus for reading information codes such as a bar code and a two-dimensional code includes, an image-forming lens fixed at a given point and imaging a reflection light from the information code, an optical sensor locating at a position relative to that of the image-forming lens and receiving an image formed by the image-forming lens, a light path bending unit bending the reflection light between the image-forming lens and the optical sensor a plurality of times, a shifter shifting the light path bending unit, a distance measurement unit measuring the distance from the information code to the reading apparatus and a controller controlling the shifter based on the measurement result of the distance measurement unit. The light path length between the image-forming lens and the optical sensor is changed by shifting the light path bending unit using the shifter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.