Method and apparatus for edge detection and location
US5220177A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1991 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Jun 24, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/046
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and apparatus are provided of a variety wherein a linear array of light emitting diodes (LEDs) are positioned at one side of a material having an edge to be detected. A photoresponsive receiver is positioned on the opposite side of the material at a predetermined stand-off distance from the LED array. The visual LEDs of the array are energized by a drive current which is pre-selected such that light emitting from each exhibits substantially uniform intensity at the photodetecting receiver when non-attenuated by the material. Additionally, the photodetector at the receiver is configured having a length of at least 6 cm to substantially improve edge related data collection. The improvements provide for substantially enhanced measurement accuracy and permit the detection of edges of transparent and semi-transparent materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.