Photoelectric object detector system
US4266124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1979 |
| Grant date | May 5, 1981 |
| Priority date | — |
| Expiry date | Aug 10, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16P3/144
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention is an improvement over the system disclosed in U.S. Pat. No. 3,805,061 for detecting intrusion of a selected area by an object and for operating or terminating operation of an associated apparatus when such intrusion occurs. It consists of improved transmitter and receiver units. The transmitter comprises a plurality of radiant energy sources that are strobed sequentially and repetitively by a clocked counter. The receiver has a plurality of radiant energy detectors, means for enabling the detectors sequentially and in synchronism with the strobing of the radiant energy sources, dual control relay means for operating or terminating operation of an associated apparatus, and cross coupled control circuits for causing the relay means to change states if a radiant energy detector fails to detect a radiant energy beam while it is enabled. The receiver's control circuits include pulse detection means for determining if the radiant energy detectors produce pulses in response to incident radiant energy beams, and means for accomplishing at least one of the following: (a) deactivating the relay means if a relay driver has a fault, (b) deactivating the relay means if a pair of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.