Hand-held optical code reader
US5703348A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1995 |
| Grant date | Dec 30, 1997 |
| Priority date | — |
| Expiry date | Dec 19, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2207/1018
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical code reader has of a reading window, a guide light source for guiding a two-dimensional code into a reading range outside the read window, an illumination light source for illuminating the two-dimensional code guided into the reading range, an optical system for focusing light reflected from the two-dimensional code illuminated by the illumination light source to form an image, an image sensor for sensing the image formed by the optical system, a read control circuit for reading the two-dimensional code on the basis of the sensed image, and a hand-held frame, having an opening which serves as the read window. The hand-held frame holds the guide light source, illumination light source, optical system, image sensor, and read control circuit. The optical system has a focal distance by which the image of the two-dimensional code is most clearly formed in a state where the two-dimensional code is located at a target point which is a specific distance away from the read window, and the guide light source has a group of light-emitting elements for projecting spotlight beams which intersect at the target point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.