Two-terminal optical sensor
US4270046A · kind A · utility
8Cited by
5References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 2, 1978 |
| Grant date | May 26, 1981 |
| Priority date | — |
| Expiry date | Nov 2, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/941
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A two-terminal optical sensor circuit comprising a light-emitting diode, phototransistor, amplifier, and current source electrically and optically coupled so as to approximate an ideal switch in one quadrant of its V-I characteristic. A remote object is detected when it moves into the optical path between the light source and sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.