Bar code readers having selectable optical elements
US6024283A · kind A · utility
27Cited by
33References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1997 |
| Grant date | Feb 15, 2000 |
| Priority date | — |
| Expiry date | Sep 17, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/423
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A bar code reader for reading a symbol located at a distance from the laser comprises an array of groups of reading elements and an array of selectable liquid crystal elements. Each of the groups of reading elements have an associated predetermined operating focal distance. At least one liquid crystal element corresponds to each group of reading elements. In the bar code reader, a device activates a selected liquid crystal element to transmit light to a selected group of reading elements. In this way, the reading elements can operate at a predetermined, fixed operating focal distance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.