Photoelectric determination of the cut-off of a light beam from a motor vehicle headlamp
US4092071A · kind A · utility
5Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 18, 1976 |
| Grant date | May 30, 1978 |
| Priority date | — |
| Expiry date | Mar 18, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to methods and devices for determining the position of the cut-off of the light beam from a motor vehicle headlight. A pair of light detectors D.sub.c and D.sub.1 are located on a screen and the headlight and screen moved relatively to one another until the light intensities I.sub.c and I.sub.1 satisfy the relation EQU I.sub.c = aI.sub.1 + b where a and b are given parameters such that when the said relation is satisfied, the position of the cut-off is indicated by the position of the detecting system D.sub.c.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.