Optical bar code reading apparatus with regular reflection detecting circuit
US5648650A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1995 |
| Grant date | Jul 15, 1997 |
| Priority date | — |
| Expiry date | Aug 7, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2207/1018
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical reading apparatus (bar code reader) including a plurality of light emitting elements, each light emitting element emitting light in different directions onto an information recording surface which has a linear recording (bar code pattern) printed thereon. A light receiving element receives reflected light from the information recording surface and generates a recording medium read signal which is transmitted to a signal processing section for converting the recording medium read signal into a display signal. The recording medium read signal is also transmitted to a regular reflection detection section. When the regular reflection detection section detects the occurrence of a regular reflection condition from the recording medium read signal, the regular reflection detection section transmits a regular reflection detection signal to a driving controlling section which controls light emission from the plurality of light emitting elements. In response to the regular reflection detection signal, the controlling driving section turns off the light emitting element whose emitted light is causing the regular reflection condition, thereby eliminating the occurrence of the regula…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.