Photoelectric cell with lockable differential processing
US5986255A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1997 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Dec 8, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/48
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photoelectric cell which detects a distance of an object, including: a first detection component configured to produce a first current which is a function of the distance of the object; a second detection component configured to produce a second current which is a function of the distance of the object; and, a processing circuit configured to shape a first voltage signal and a second voltage signal that correspond to the first current and second current, respectively. The processing circuit includes a main comparator configured to determine whether the distance of the object is greater or less than a detection range of said photoelectric cell by comparing the first voltage signal and the second voltage signal and to output a switching signal indicative of whether the distance of the object is greater or less than the detection range, and, a locking comparator configured to maintain the switching signal in an inactive state when the first voltage signal is less than a set-point voltage which corresponds to a detection distance greater than the detection range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.