Patent US596283A successfully refreshed from Google Patents.
Patent US3733480A successfully refreshed from Google Patents.
US3733480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Studio lighting apparatus
Assignee: CBS Broadcasting Inc
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Filing: 1971-06-24
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Granted: 1973-05-15
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Expires: 1991-06-24
Abstract
Abstract Apparatus for illuminating a background surface of a television studio or stage with white light comprising red, blue and green color components that are matched with the corresponding primary color sensitivity curves in a color television or film camera. The apparatus comprises an assembly of reflectors of elliptical shape supported in contiguous side-by-side relationship with successive reflectors positioned slightly higher than the last and having their major axes departing from the vertical to a greater extent than the last. Each reflector is illuminated by an elongated fluorescent lamp mounted at the focus of the reflector and having a primary color-emitting phosphor.
Inventors
- 👤 W Glenn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:56
CPC Classifications
F; F21; F21V; F21V9/00; F21V9/08; G; G03; G03B; G03B15/00; G03B15/02; G03B15/06; F21W; F21W2131/00; F21W2131/40; F21W2131/406
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
159 words
Apparatus for artifically illuminating a studio or stage for viewing with a color camera having predetermined primary color sensitivity characteristics, comprising, a bank of at least three fluorescent lamps a first of which contains a blue color-emitting phosphor, a second of which contains a green color-emitting phosphor, and at least one additional one of which contains a red color-emitting phosphor, the light intensity of the included red color-emitting lamps for the same input power being substantially equal to that of either the blue or green color-emitting lamps, said lamps being operative when simultaneously energized to emit light containing primary colors substantially matched with the primary color sensitivity characteristics of the camera, and at least one highly transmissive and color selective primary color filter positioned to filter the light from one or more corresponding primary color-emitting fluorescent lamps for improving the match of the primary color light emitted by the lamps to the primary color sensitivity characteristics of the camera.
Claim 2
Dependent Claim
159 words
Apparatus for artifically illuminating a studio or stage for viewing with a color camera having predetermined primary color sensitivity characteristics, comprising, a bank of at least three fluorescent lamps a first of which contains a blue color-emitting phosphor, a second of which contains a green color-emitting phosphor, and at least one additional one of which contains a red color-emitting phosphor, the light intensity of the included red color-emitting lamps for the same input power being substantially equal to that of either the blue or green color-emitting lamps, said lamps being operative when simultaneously energized to emit light containing primary colors substantially matched with the primary color sensitivity characteristics of the camera, and at least one highly transmissive and color selective primary color filter positioned to filter the light from one or more corresponding primary color-emitting fluorescent lamps for improving the match of the primary color light emitted by the lamps to the primary color sensitivity characteristics of the camera.
Claim 3
Dependent Claim
69 words
Apparatus in accordance with the claim 1 further including dimming means electrically connected with said lamps for independently varying the current flow through the lamps to thereby vary the intensity of light emitted in any given primary color so that the combined intensity of the bank of lamps can be varied without affecting the match of the emitted primary colors with the primary color sensitivity characteristics of the camera.
Claim 4
Dependent Claim
88 words
Apparatus in accordance with claim 1 further including an assembly of a like number of elongated reflectors of elliptical shape arranged side-by-side with a predetermined angular relationship between the axes of the reflectors, each of said lamps being mounted at the focus of a corresponding one of said reflectors, said angular relationship between the axes of the reflectors being such that the lamps directly illuminate an area in front of the reflectors and illuminate their respective reflectors to indirectly illuminate another area contiguous with the directly illuminated area.
Claim 5
Dependent Claim
74 words
Apparatus in accordance with claim 3 wherein successive ones of said reflectors are positioned higher than the last to such an extent, and have their major axes departing from the vertical in a direction toward the lowermost reflector to a greater extent than the last, such that the lamps directly illuminate an area in front of the reflectors and illuminate their respective reflectors to indirectly illuminate another area contiguous with the directly illuminated area.
Claim 6
Dependent Claim
50 words
Apparatus in accordance with claim 4 having four elliptical reflectors, and wherein the lowermost and uppermost reflectors have red color-emitting fluorescent lamps mounted therein, the next to the lowest reflector has a blue color-emitting fluorescent lamp mounted therein, and the other reflector has a green color-emitting fluorescent lamp mounted therein.
Claim 7
Dependent Claim
142 words
Apparatus for artifically illuminating a studio or stage for viewing with a color camera having predetermined primary color sensitivity characteristics, comprising, a bank of at least four fluorescent lamps the first of which contains a blue color-emitting phosphor, a second of which conTains a green color-emitting phosphor, and two of which contain a red color-emitting phosphor, the light intensity of the red color-emitting lamp for the same input power being approximately one-half that of the blue and green color-emitting lamps, said lamps being operative when simultaneously energized to emit light containing primary colors substantially matched with the primary color sensitivity characteristics of the camera, and a corresponding number of highly transmissive and color selective primary color filters positioned to filter the light from the corresponding primary color-emitting fluorescent lamps for improving the match of the primary color light emitted by the lamps.
Claim 8
Dependent Claim
142 words
Apparatus for artifically illuminating a studio or stage for viewing with a color camera having predetermined primary color sensitivity characteristics, comprising, a bank of at least four fluorescent lamps the first of which contains a blue color-emitting phosphor, a second of which conTains a green color-emitting phosphor, and two of which contain a red color-emitting phosphor, the light intensity of the red color-emitting lamp for the same input power being approximately one-half that of the blue and green color-emitting lamps, said lamps being operative when simultaneously energized to emit light containing primary colors substantially matched with the primary color sensitivity characteristics of the camera, and a corresponding number of highly transmissive and color selective primary color filters positioned to filter the light from the corresponding primary color-emitting fluorescent lamps for improving the match of the primary color light emitted by the lamps.
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |