Selective illumination
US4225808A · kind A · utility
67Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1978 |
| Grant date | Sep 30, 1980 |
| Priority date | — |
| Expiry date | Jun 5, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Different portions of an area are selectively highlighted in response to observer proximity. An adjustable dimmer establishes the non-highlight illumination level for each area. The dimmer is overridden by observer-sensing circuitry to produce the highlight illumination level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.