Light-responsive electric switch
US4139802A · kind A · utility
3Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1977 |
| Grant date | Feb 13, 1979 |
| Priority date | — |
| Expiry date | Jun 21, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The disclosure is of a light-responsive electric switch which is characterized in that it is constituted mainly by a photoresistive cell inserted in a voltage-divider bridge of which the voltage variations, as functions of the illumination, control a standard integrated circuit comprising four NAND gates which, through the intermediary of a transistor, actuate a triac controlling the illumination circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.