Optical reader
US5504317A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 5, 1994 |
| Grant date | Apr 2, 1996 |
| Priority date | — |
| Expiry date | Jan 5, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10702
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In an optical reader a lens system is located between a source of light designed to illuminate an object to be read and the object. The lens system is designed to refract and diffuse the light produced by the light source to reduce the deleterious effect of specular light reflected from the illuminated object into the optical reader and an image sensor designed to convert reflected photo signals into electric analog signals. In one embodiment of the invention the optical reader includes an array of LEDs and a lens having prisms located in front of each LED for refracting or bending the light output of each LED to reduce the generation of specular light being reflected. In another embodiment the optical reader includes a lens with a light shield strip to prevent the generation of specular light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.