Bar code symbol scanning system having a holographic laser scanning disc utilizing maximum light collection surface area thereof and having scanning facets with optimized light collection efficiency
US6199759A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1997 |
| Grant date | Mar 13, 2001 |
| Priority date | — |
| Expiry date | Sep 30, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2207/1018
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A bar code symbol scanning system having a holographic laser scanning disc utilizing maximum light collection surface area thereof and having scanning facets with optimized light collection efficiency. The holographic scanning disc has a plurality of holographic optical elements for scanning a laser beam and producing a laser scanning pattern for scanning code symbols. Each holographic optical element being supported on a support disc between the inner and outer perimeters thereof, and each has a surface area for carrying out light collecting operations and at least a portion of the surface area is disposed adjacent the outer perimeter of the support disc for carrying out laser beam scanning operations. The sum of all of the facet surface areas of the plurality of said holographic optical elements is substantially equal to the surface area of the available light collecting region of the support disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.