Patent US3922080A successfully refreshed from Google Patents.
US3922080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection apparatus using additive mixture of colors
Assignee: Zaidan hojin Nippon Shikisai Kenkyusho
•
Filing: 1973-07-24
•
Granted: 1975-11-25
•
Expires: 1993-07-24
Abstract
Abstract This invention relates to a projection apparatus using additive mixture of colors. Said apparatus comprises a lamp serving as a light source, a first condenser lens collecting light emanating from said lamp and forming an image of a filament of the lamp in an area infront of the lens, a color mixing filter assembly disposed in a position in which said image of said filament of said lamp is formed, a second condenser lens arranged in a color mixing zone disposed forwardly of the assembly, a slide to be projected juxtaposed to a main surface of said second condenser lens, and a projection lens for projecting an image of said slide which is colored by mixedly colored light from said second condenser lens.
Inventors
- 👤 Akira Kodama
- 👤 Mamoru Yaegashi
- 👤 Shoichi Nishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:35
CPC Classifications
G; G03; G03B; G03B33/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
211 words
A projection apparatus using an additive mixture of colors comprising a lamp serving as a light source, a first condenser lens arranged in a position in front of the light source for collecting light emanating from said lamp and forming an image of a filament of the lamp in an arrea in front of the lens, a color mixine filter assembly disposed in a position in which said image of said filament of said lamp is formed by said first condenser lens, said color mixing filter assembly comprising a plurality of filter elements different in hue from one another and each varying in saturation gradually from one end thereof to the other and arranged whereby the hue is varied in the order of the wavelengths when said filter elements are moved in a direction normal to that direction in which the saturation of the filter element is varied, a second condenser lens arrAnged in a color mixing zone disposed forwardly of the assembly for collecting light colored by said filter assembly, a slide disposed in a forward position in the vicinity of said second condenser lens, and a projection lens disposed forwardly of the slide for projecting an image of said slide onto a screen disposed forwardly of said projection lens.
Claim 2
Dependent Claim
211 words
A projection apparatus using an additive mixture of colors comprising a lamp serving as a light source, a first condenser lens arranged in a position in front of the light source for collecting light emanating from said lamp and forming an image of a filament of the lamp in an arrea in front of the lens, a color mixine filter assembly disposed in a position in which said image of said filament of said lamp is formed by said first condenser lens, said color mixing filter assembly comprising a plurality of filter elements different in hue from one another and each varying in saturation gradually from one end thereof to the other and arranged whereby the hue is varied in the order of the wavelengths when said filter elements are moved in a direction normal to that direction in which the saturation of the filter element is varied, a second condenser lens arrAnged in a color mixing zone disposed forwardly of the assembly for collecting light colored by said filter assembly, a slide disposed in a forward position in the vicinity of said second condenser lens, and a projection lens disposed forwardly of the slide for projecting an image of said slide onto a screen disposed forwardly of said projection lens.
Claim 3
Dependent Claim
53 words
An apparatus according to claim 1 wherein said filament of said lamp emits light having a spatial expanse, and said filter elements are of the stepped wedge type and each varying in saturation in steps so that one end thereof is darkest and the color becomes lighter in going toward the other end.
Claim 4
Dependent Claim
39 words
An apparatus according to claim 1 wherein said filament of said lamp emits light of a linear form, and said filter elements are of the wedge type and continuously varying in saturation from one end thereof to the other.
Claim 5
Dependent Claim
52 words
An apparatus according to claim 1 further comprising a field lens disposed in the vicinity of said color mixing filter assembly for projecting light emanating from said first condenser lens to said second condenser lens, and a lightness adjusting plate disposed movably in the vicinity of said field lens for adjusting lightness.
Claim 6
Dependent Claim
46 words
An apparatus according to claim 1 further comprising a field lens disposed substantially in the same plane as said color mixing filter assembly for projecting light emanating from a main surface of said first condenser lens on to the main surface of the second condenser lens.
Claim 7
Dependent Claim
168 words
An apparatus according to claim 4 further comprising a feed screw connected to the shaft of a first motor and adapted to move horizontally said lightness adjusting plate as said first motor rotates, a pair of limit switches spaced apart from each other for a predetermined distance inn order to limiting the horizontal movement of said lightness adjusting plate, a feed screw connected to the shaft of a second motor and adapted to move horizontally said color mixing filter assembly for varying hue as said second motor rotates, a feed screw connected to the shaft of a third motor and adaptd to move vertically said color mixing filter assembly for varying saturation as said third motor rotates, and two pairs of limit switches each pair being spaced apart from each other for a predetermined distance and one pair is adapted to limit the horizontal movement of the color mixing filter assembly while the other pair is adapted to limit the vertical movement of the color mixing filter assembly.
Claim 8
Dependent Claim
91 words
An apparatus according to claim 6 further comprising three counters coupled to said motors for adjusting lightness, hue and saturation respectively, one counter being adapted to count and indicate the distance covered by the horizontal movement of said lightness adjusting plate, another counter being adapted to count and indicate the distance covered by the horizontal movement of said color mixing filter assembly for varying hue and still another counter being adapted to count and indicate the distance covered by the horizontal movement of said color mixing filter assembly for varying saturation.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |