Sensitivity adjustment circuit for bar code scanner and method therefor
US5406062A · kind A · utility
96Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1993 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Jul 19, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
After serial signals output from a CCD sensor are amplified, a peak value of white levels corresponding to the space portions of bar codes is held by a peak hold circuit, and then the held peak value is converted into a digital value by an analog-to-digital conversion circuit. The value obtained by multiplying accumulation time data from the CCD sensor by the target value of the white level peak value is divided by the digital value. The next accumulation time of the CCD sensor is set on the basis of the result of this division. In this way, the sensitivity of the scanner is adjusted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.