Magnetic reader for bar encoded characters
US4053737A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1976 |
| Grant date | Oct 11, 1977 |
| Priority date | — |
| Expiry date | Jun 25, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/2247
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
CMC7 characters as coded by variations in spacing between vertical bars of magnetic material are automatically read as they pass a reading electron by separately sensing all magnetic materials in each of a multiplicity of side-by-side paths spanning the height of the characters and extending the length of the field on which the characters may appear to produce a like multiplicity of analog signals. Positive excursions of the signals above a predetermined amplitude level are summed as a first time amplitude function. Negative excursions of the signals above a predetermined level are summed as a second time amplitude function. A first train of pulses is generated, one pulse for each peak in the sum of the positive excursions. A second train of pulses is generated on pulse for each peak in the sum of the negative excursions. Signals are produced from the first and the second trains representative of leading and trailing edges of bars forming the character for identification of each character in dependence upon the bar spacings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.