US4138714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of lighting for colored shadows
Assignee: Mitsubishi Electric Corp
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Filing: 1977-05-19
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Granted: 1979-02-06
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Expires: 1997-05-19
Abstract
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; <IMAGE> <IMAGE> <IMAGE> 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 IR designates an illuminance by only the lamp in the R group; IG designates an illuminance by only the lamp in the G group and IB designates an illuminance by only the lamp in the B group. }Symbol iR iG iB }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 }
Inventors
- 👤 Michihiro Tsuchihashi
- 👤 Masato Saito
- 👤 Makoto Yamanoshita
- 👤 Hidetoshi Katsura
- 👤 Osamu Myodo
- 👤 Koichiro Maeyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:17
CPC Classifications
F; F21; F21V; F21V9/00; F21V9/40; F21W; F21W2131/00; F21W2131/40; F21W2131/406; Y; Y10; Y10S; Y10S362/00; Y10S362/806; Y10S362/811
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
166 words
A method of lighting for colored shadows which comprises arranging color light sources in three R, G and B groups of at least one light source for yellow to red (R group); at least one light source for green (G group) and at least one light source for violet to blue (B group) and illuminating an object to obtain colored shadows of the object to give the ratios of illuminances by the color light sources; ##EQU4## in a range surrounded by the following ratios of j-k-l-m-n-e-f-j in a triangular coordinate wherein I R designates an illuminance by only the lamp in the R group; I G designates an illuminance by only the lamp in the G group and I 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
______________________________________
Claim 2
Independent Claim
166 words
A method of lighting for colored shadows which comprises arranging color light sources in three R, G and B groups of at least one light source for yellow to red (R group); at least one light source for green (G group) and at least one light source for violet to blue (B group) and illuminating an object to obtain colored shadows of the object to give the ratios of illuminances by the color light sources; ##EQU4## in a range surrounded by the following ratios of j-k-l-m-n-e-f-j in a triangular coordinate wherein I R designates an illuminance by only the lamp in the R group; I G designates an illuminance by only the lamp in the G group and I 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
______________________________________
Claim 3
Dependent Claim
66 words
A method of lighting for colored shadows according to claim 1 wherein the ratios of illuminances i R , i G and i B are in a range surrounded by the following ratios of s-t-u-v-w-x-s. ______________________________________
Symbol i.sub.R i.sub.G i.sub.B
______________________________________
s 0.6 0.36 0.04
t 0.6 0.2 0.2
u 0.4 0.3 0.3
v 0.2 0.6 0.2
w 0.2 0.7 0.1
x 0.26 0.7 0.04
______________________________________
Claim 4
Dependent Claim
139 words
A method of lighting for colored shadows according to claim 1, wherein the light source in the R group is a yellow color lamp, an orange color lamp, a red color lamp, a high pressure sodium lamp, an orange metal halide lamp (sodium halide is added) and a red metal halide lamp (lithium halide is added), a lamp having a front orange-red colored filter; and the light source in the G group is a green color lamp and a green metal halide lamp (thallium halide is added), a lamp having a front green colored filter; and the light source in the B group is a violet color lamp, a blue color lamp, a violet metal halide lamp (gallium halide is added) and a blue metal halide lamp (indium halide is added), a lamp having a front violet-blue colored filter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |