Method of lighting for colored shadows
US4138714A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1977 |
| Grant date | Feb 6, 1979 |
| Priority date | — |
| Expiry date | May 19, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/811
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Beautifully and balancedly colored shadows can be imparted by arranging color lamps in three R, G and B groups, illuminating an object to obtain colored shadows of the object to give the ratios of illuminances by the color light lamps; ##EQU1## in a range surrounded by the following ratios of j-k-l-m-n-e-f-j in the triangular coordinate of FIG. 2 wherein I.sub.R designates an illuminance by only the lamp in the R group; I.sub.G designates an illuminance by only the lamp in the G group and I.sub.B designates an illuminance by only the lamp in the B group. ______________________________________ Symbol i.sub.R i.sub.G i.sub.B ______________________________________ j 0.78 0.2 0.02 k 0.65 0.2 0.15 l 0.65 0.05 0.3 m 0.55 0.05 0.4 n 0.2 0.4 0.4 e 0.05 0.8 0.15 f 0.18 0.8 0.02 ______________________________________
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.