Robust barcode and reader for rod position determination
US7278574B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2007 |
| Grant date | Oct 9, 2007 |
| Priority date | — |
| Expiry date | Feb 26, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q20/203
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A barcode reader and processing circuitry are disclosed for identifying a position of a cylinder rod, for example, along a path of movement. The barcode is marked on a surface of the rod and constitutes a series of markings extending along a portion of the length of the rod. The markings represent encoded information based on numbers calculated with a random number generator, and are grouped into subsets, each of which corresponds to a particular rod position. A portion of the rod including a subset of barcode markings is exposed to light emitted from the reader. Light reflected off the barcode is sensed with an array of photosensors provided in the reader. The photosensors generate electrical signals, and using Bayesian probability, a likely subset of markings is determined corresponding to the received electrical signals. Once identified, the markings subset is associated with a location corresponding to the position of the rod. A barcode reader is also described that is relatively easy to assemble and provides uniform illumination of the barcode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.