Optical scanner with power efficient lens
US5164584A · kind A · utility
38Cited by
15References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1991 |
| Grant date | Nov 17, 1992 |
| Priority date | — |
| Expiry date | Jun 24, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10702
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical scanner which employs a special lens to maximize the percentage of focused laser light that passes through a collimating aperture. The optical scanner also includes a laser diode and a housing containing the laser diode and having a wall with the aperture therethrough for collimating light from the lens. The lens may be a gradient index (grin) lens, a bi-zonal lens, or an axicon lens. Another scanner is disclosed which employs an axicon lens to focus light reflected from an article having a bar code label to a detector for a range of article distances from the scanner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.