Safety photoelectric switch
US8330095B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 2009 |
| Grant date | Dec 11, 2012 |
| Priority date | — |
| Expiry date | Apr 21, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V8/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is provided an optical scanning type photoelectric switch capable of preventing interference with another photoelectric switch by use of its own capability, wherein, as for light projection pulse periods of the first and second optical scanning type photoelectric switches, the period is set to 30 μs in the first optical scanning type photoelectric switch while the period is set to 33 μs in the second optical scanning type photoelectric switch 1B, the light projection pulses have the same pulse width, and by setting the light projection periods different between the first and second optical scanning type photoelectric switches, even if mutual interference occurs between any optical axes, a phase difference of 36 degrees in rotation period is generated therebetween in a next scan, thereby preventing occurrence of the interference in succession in a plurality of times of scanning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.