Bar code readers using surface emitting laser diode
US6062476A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1997 |
| Grant date | May 16, 2000 |
| Priority date | — |
| Expiry date | Mar 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/423
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A scanning device incorporates a vertical cavity surface emitting laser (VCSEL). The laser diode may be mounted directly on an Si substrate which is adapted for movement to produce a scan pattern. A collimating lens may be directly mounted on the emitting surface of the laser. A plurality of lasers may be mounted on the substrate and operated in sequence without movement of the substrate to produce the effect of a scan. The scanning device emits visible or invisible light towards a target such as a bar code and a detector (mounted on the same or an adjacent substrate) senses the light reflected by the target to produce data which is decoded for further processing. A VCSEL uses low current and emits light from a relatively large area so that a relatively large amount of light is emitted for relatively small heat generation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.