US3644785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illumination arrangement for recording and/or reproduction in color
Assignee: SVERIGES RADIO AB
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Filing: 1969-10-03
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Granted: 1972-02-22
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Expires: 1989-10-03
Abstract
Abstract An illumination arrangement for use in connection with picture recording or reproduction in color. The device automatically compensates for changes in the spectral composition of the light at various light intensities. In one embodiment, the device includes a first lamp and a second, smaller, lamp, the lamps being coupled such that a change in the color temperature in one direction of a first lamp is compensated for by a change in the color temperature of a second lamp, the change in the color temperature of the second lamp being such in its direction and amount, to compensate for the change in color temperature of the first lamp.
Inventors
- 👤 Sven O Jarmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:24
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/73; H; H05; H05B; H05B39/00; H05B39/04; H05B39/041; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
102 words
Illumination apparatus to be used in connection with picture recording or reproduction in color comprising a first lamp, a second lamp smaller than said first lamp, means for varying the color temperature of said first lamp, means for varying the color temperature of said second lamp, and coupling means for said color temperature varying means such that a change in the color temperature varying means such that a change in the color temperature of said first lamp causes a change in the color temperature of said second lamp, the latter change being sufficient indirection and amount to compensate for the former change.
Claim 2
Dependent Claim
102 words
Illumination apparatus to be used in connection with picture recording or reproduction in color comprising a first lamp, a second lamp smaller than said first lamp, means for varying the color temperature of said first lamp, means for varying the color temperature of said second lamp, and coupling means for said color temperature varying means such that a change in the color temperature varying means such that a change in the color temperature of said first lamp causes a change in the color temperature of said second lamp, the latter change being sufficient indirection and amount to compensate for the former change.
Claim 3
Dependent Claim
26 words
Illumination apparatus according to claim 1 wherein the normal operating color temperature of said first lamp is substantially the same as that of said second lamp.
Claim 4
Dependent Claim
112 words
Illumination apparatus according to claim 1 wherein said means for varying the color temperature of said first lamp comprises means for changing voltage to change the light intensity thereof, wherein said means for varying the color temperature of said second lamp comprises means for changing voltages to change the light intensity thereof, said coupling means being arranged to increase the voltage to said second lamp when the voltage to said first lamp is decreased from maximum until a point of at least approximate equilibrium between the color temperatures of these lamps is reached, and to thereafter decrease the voltage to said second lamp on further decrease in voltage to said first lamp.
Claim 5
Dependent Claim
60 words
Illumination apparatus according to claim 1 wherein said means for varying the color temperature of said first lamp comprises means for varying the voltage to said first lamp comprising a first variable resistor and said means for varying the color temperature of said second lamp comprises means for varying the voltage to said second lamp Comprising a second variable resistor.
Claim 6
Dependent Claim
33 words
Illumination apparatus according to claim 4 wherein said first and second resistors each comprise slide means for varying the resistance value thereof, and wherein said coupling means comprises a member linking said slides.
Claim 7
Dependent Claim
54 words
Illumination apparatus according to claim 4 wherein at least one resistor comprises a wound resistance wire with a variable winding spacing, the spacing of the windings being such that the color temperature of the combined light from said first and second lamps is substantially constant over the range of resistance values of said resistors.
Claim 8
Dependent Claim
34 words
Illumination apparatus according to claim 4 wherein said means for changing voltage of said first and second lamps each further comprises a voltage regulator electrically connected to said variable resistor and to said lamp.
Claim 9
Dependent Claim
27 words
Illumination apparatus according to claim 7 wherein the means for changing voltage of said second lamp further comprises a fixed connected in series with said variable resistor.
Claim 10
Dependent Claim
81 words
Illumination apparatus according to claim 3 wherein said means for changing the voltage to said first lamp comprises a first variable resistor, and said means for changing the voltage to said second lamp comprises a control unit responsive to the output voltage of said first variable resistor to produce a control unit output voltage fed to said second lamp, the latter output voltage compensating for the color temperatures of said first lamp determined by the setting of said first variable resistor.
Claim 11
Dependent Claim
57 words
Illumination apparatus according to claim 9 wherein said means for changing the voltage to said first lamp further includes a voltage regulator controlled by the output voltage of said variable resistor, and wherein said means for changing the voltage of said second lamp further includes a voltage regulator controlled by the output voltage of said control unit.
Claim 12
Dependent Claim
38 words
Illumination apparatus according to claim 9 wherein said control unit is supplied with direct current from a first voltage supply and wherein said first and second lamps are each supplied with alternating current from a second voltage supply.
Claim 13
Dependent Claim
36 words
Illumination apparatus according to claim 10 wherein each of said voltage regulators comprises two controlled rectifiers connected in parallel in the line supplying current to its respective lamp, said rectifiers being connected in electrically opposite directions.
Claim 14
Dependent Claim
57 words
Illumination apparatus according to claim 12 wherein said means for changing the voltage to said second lamp comprises a transformer, the primary winding of which is connected into the conductor supplying current from said voltage regulator to said first lamp, the secondary winding thereof being connected to a rectifier for feeding rectified voltage to said control unit.
Claim 15
Dependent Claim
52 words
Illumination apparatus according to claim 13 wherein the voltage from said secondary winding is connected to said control unit through a plurality of Zener rectifiers graded by means of ignition voltage resistors, the rectifier grading providing the correct characteristics for compensation of a change in the color temperature of said first lamp.
Claim 16
Dependent Claim
101 words
Illumination apparatus according to claim 14 wherein said transformer includes two secondary windings each being connected to one set of Zener-rectifiers along with control voltage controlled resistors one of said set of Zener rectifiers being intended to cause a rise of voltage to said second lamp required in the beginning of the control range, whereas the other set of Zener rectifiers is intended to cause the decrease of the voltage to said second lamp required at the end of the controlled range, said two sets of graded Zener rectifiers being for this purpose connected in directions electrically opposite to each other.
Claim 17
Dependent Claim
26 words
Illumination apparatus according to claim 15 further comprising an amplifier connected in the conduit between the Zener rectifiers and the control unit for said second lamp.
Claim 18
Dependent Claim
14 words
Illumination apparatus according to claiM 13 wherein said rectifier comprises a double wave rectifier.
Claim 19
Dependent Claim
12 words
Illumination apparatus according to claim 17 wherein said rectifier comprises a Graetz-bridges.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |