Optical information reading device
US5392150A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1992 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | May 15, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2207/1016
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A crystal resonant scanner has a scanning mirror which is cyclically reciprocally oscillatable for reflecting and deflecting a laser beam emitted by a laser beam source to scan an optically detectable pattern of information such as a bar code. A concave mirror is fixed in position for converging a light beam reflected off the optically detectable pattern upon scanning the optically detectable pattern with the light beam reflected by the scanning mirror. The concave mirror has a hole defined substantially centrally therein, and the scanning mirror is positioned in the hole. The light beam converged by the concave mirror is detected by a photodetector. The laser beam source and the photodetector are positioned in front of the scanning mirror and the concave mirror. The photodetector produces an electric signal indicative of the intensity of the detected light beam. The produced electric signal is supplied to an electric signal processing system which produces sampled values of the electric signal and reads the optically detectable pattern based on the sampled values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.