US4125888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of lighting for colored shadows
Assignee: Mitsubishi Electric Corp
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Filing: 1977-02-14
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Granted: 1978-11-14
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Expires: 1997-02-14
Abstract
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: <IMAGE>
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
2026-11-09 09:42
CPC Classifications
F; F21; F21V; F21V13/00; F21V13/02; F21V13/08; F21W; F21W2131/00; F21W2131/40; F21W2131/406; Y; Y10; Y10S; Y10S362/00; Y10S362/806; Y10S362/811
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
245 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 a white light source for white light (W group) and illuminating objects to obtain colored shadows of the objects to give the ratio of illuminance by the white light source; ##EQU5## wherein I W designates an illuminance at the part illuminated by only the white light source but the shadows to the lights of the light sources in the R group, G group and B group; I R designates an illuminance at the part illuminated by only the light source in the R group in the shadow of the object to both of the lights and of the light source in the G group and the B group; I G designates an illuminance at the part illuminated by only the light source in the G group in the shadow of the object to both of the lights of the light sources in the R group and the B group and I B designates an illuminance at the part illuminated by only the light source in the B group in the shadow of the object to both of the lights of the light sources in the R group and the G group.
Claim 2
Independent Claim
245 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 a white light source for white light (W group) and illuminating objects to obtain colored shadows of the objects to give the ratio of illuminance by the white light source; ##EQU5## wherein I W designates an illuminance at the part illuminated by only the white light source but the shadows to the lights of the light sources in the R group, G group and B group; I R designates an illuminance at the part illuminated by only the light source in the R group in the shadow of the object to both of the lights and of the light source in the G group and the B group; I G designates an illuminance at the part illuminated by only the light source in the G group in the shadow of the object to both of the lights of the light sources in the R group and the B group and I B designates an illuminance at the part illuminated by only the light source in the B group in the shadow of the object to both of the lights of the light sources in the R group and the G group.
Claim 3
Dependent Claim
116 words
A method of lighting for colored shadows according to claim 1, wherein the arranging step includes 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 a white light source for white light (W group); and said white light source in the W group is an incandescent lamp, a halogen lamp, a warm white fluorescent lamp, a daylight fluorescent lamp, a white fluorescent high pressure mercury lamp, a warm white fluorescent high pressure mercury lamp, or a white metal halide lamp.
Claim 4
Dependent Claim
202 words
A method of lighting for colored shadows according to claim 1, wherein the arranging step includes 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 a white light source for white light (W group); and 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 color glass plate; and the light source in the G group is a green color lamp and a green metal halide lamp (thallium halide is added), or a lamp having a front green color glass plate; 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), or a lamp having a front violet-blue color glass.
Claim 5
Dependent Claim
209 words
A method of lighting for colored shadows according to claim 1, wherein the illuminating step includes illuminating objects to obtain colored shadows of the objects to give the ratio of illuminance by the white light source; ##EQU6## wherein Iw designates an illuminance at the part illuminated by only the white light source but the shadows to the lights of the light sources in the R group, G group and B group; I R designates an illuminance at the part illuminated by only the light source in the R group in the shadow of the objects to both the lights of the light source in the G group and the B group; I G designates an illuminance at the part illuminated by only the light source in the G group in the shadow of the object to both of the lights of the light sources in the R group and the B group and I B designates an illuminance at the part illuminated by only the light source in the B group in the shadow of the object to both of the lights of the light sources in the R group and the G group; wherein the illuminances by the color light sources are balanced in the range of ##EQU7##
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) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |