Method of lighting for colored shadows
US4125888A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1977 |
| Grant date | Nov 14, 1978 |
| Priority date | — |
| Expiry date | Feb 14, 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 and a white light lamp for white light (W group), illuminating objects to obtain colored shadows of the objects, giving the ratio of illuminance by the white light lamp: ##EQU1## wherein I.sub.W designates an illuminance at the part illuminated by only the white light lamp, and also the illuminance in the shadows to the lights of the lamps of the three R, G and B groups; and I.sub.R designates an illuminance at the part illuminated by only the lamp of the R group in the shadow of the object to both of the lights of the lamps of the G group and the B group; I.sub.G designates an illuminance at the part illuminated by only the lamp in the G group in the shadow of the object to both of the lights of the lamps in the R group and the B group and I.sub.B designates an illuminance at the part illuminated by only the lamp in the B group in the shadow of the object to both of the lights of the lamps in the R group and the G group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.