US3705259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Networks for setting up and adjusting the color temperature of the picture reproduced by the picture tube of a color television receiver
Assignee: Electrohome Ltd
•
Filing: 1971-09-02
•
Granted: 1972-12-05
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Expires: 1991-09-02
Abstract
Abstract A simple network for setting up and adjusting the color temperature of the picture reproduced by the picture tube of a color television receiver and which requires that only one control be brought out to a location where it is accessible to a customer or serviceman includes a variable resistor directly connected in circuit with one of the ''''red'''' and ''''green'''' electron guns of the picture tube for varying the strength of the signal translated by the luminance signal channel of the receiver and applied to the gun without varying any D.C. potential of the gun. Another variable resistor is directly connected in circuit with the other two guns of the picture tube and varies simultaneously but in opposite directions the strength of the signal translated by the luminance signal channel and applied to the two guns without varying any D.C. potential thereof.
Inventors
- 👤 John D Lovely
- 👤 Electrohome Ltd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:22
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/73
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
181 words
In a receiver for producing monochrome and color images of televised scenes of a type having a chrominance signal channel, a luminance signal channel, a cathode ray tube having ''''red'''', ''''green'''' and ''''blue'''' electron guns for translating red, green and blue hue signals respectively, each of said electron guns including a cathode and a grid electrode, and means connecting said channels to said electron guns to supply signals translated by said channels to said electron guns, the improvement wherein said luminance signal channel includes first variable resistance means directly connected in circuit with one of said ''''red'''' and ''''grEen'''' guns for varying the strength of the signal translated by said luminance signal channel and applied to said one gun without varying any D.C. potential of said one gun and second variable resistance means directly connected in circuit with the other two of said guns and arranged to vary simultaneously but in opposite directions the strength of the signal translated by said luminance signal channel and applied to said other two guns without varying any D.C. potential of said other two guns.
Claim 2
Dependent Claim
181 words
In a receiver for producing monochrome and color images of televised scenes of a type having a chrominance signal channel, a luminance signal channel, a cathode ray tube having ''''red'''', ''''green'''' and ''''blue'''' electron guns for translating red, green and blue hue signals respectively, each of said electron guns including a cathode and a grid electrode, and means connecting said channels to said electron guns to supply signals translated by said channels to said electron guns, the improvement wherein said luminance signal channel includes first variable resistance means directly connected in circuit with one of said ''''red'''' and ''''grEen'''' guns for varying the strength of the signal translated by said luminance signal channel and applied to said one gun without varying any D.C. potential of said one gun and second variable resistance means directly connected in circuit with the other two of said guns and arranged to vary simultaneously but in opposite directions the strength of the signal translated by said luminance signal channel and applied to said other two guns without varying any D.C. potential of said other two guns.
Claim 3
Dependent Claim
25 words
The invention according to claim 1 wherein said one gun is said ''''red'''' gun and said other two guns are said ''''blue'''' and ''''green'''' guns.
Claim 4
Dependent Claim
107 words
The invention according to claim 2 wherein said second variable resistance means is a potentiometer having first and second terminals and a movable terminal intermediate said first and second terminals, said first and second terminals being connected in circuit with said ''''blue'''' and ''''green'''' guns respectively, and the signal translated by said luminance signal channel being supplied to said ''''blue'''' and ''''green'''' guns via said movable terminal and then via said first and second terminals respectively, whereby movement of said movable terminal varies the strength of the signal translated by said luminance signal channel and applied to said ''''blue'''' and ''''green'''' guns simultaneously and in opposite directions.
Claim 5
Dependent Claim
32 words
The invention according to claim 4 wherein said first variable resistance means and said first and second terminals are connected to said cathode electrodes of said ''''red'''', ''''blue'''' and ''''green'''' guns respectively.
Claim 6
Dependent Claim
78 words
The invention according to claim 3 wherein said receiver includes ''''red'''', ''''green'''' and ''''blue'''' color signal amplifiers and networks for matrixing the signal translated by said luminance signal channel and ''''red'''', ''''green'''' and ''''blue'''' color difference signals translated by said chrominance signal channel, and means including said first and second variable resistance means for supplying the signal translated by said luminance signal channel to said ''''red'''' and to said ''''green'''' and ''''blue'''' color signal amplifiers and networks respectively.
Claim 7
Dependent Claim
37 words
The invention according to claim 3 wherein said first and second variable resistance means are the sole means in said luminance signal channel for varying the color temperature of the picture reproduced by said cathode ray tube.
Claim 8
Dependent Claim
32 words
The invention according to claim 6 wherein said first variable resistance means and said first and second terminals are connected to said cathode electrodes of said ''''red'''', ''''blue'''' and ''''green'''' guns respectively.
Claim 9
Dependent Claim
78 words
The invention according to claim 6 wherein said receiver includes ''''red'''', ''''green'''' and ''''blue'''' color signal amplifiers and networks for matrixing the signal translated by said luminance signal channel and ''''red'''', ''''green'''' and ''''blue'''' color difference signals translated by said chrominance signal channel, and means including said first and second variable resistance means for supplying the signal translated by said luminance signal channel to said ''''red'''' and to said ''''green'''' and ''''blue'''' color signal amplifiers and networks respectively.
Claim 10
Dependent Claim
25 words
The invention according to claim 1 wherein said one gun is said ''''green'''' gun and said other two guns are said ''''blue'''' and ''''red'''' guns.
Claim 11
Dependent Claim
107 words
The invention according to claim 9 wherein said second variable resistance means is a potentiometer having first and second terminals and a movable terminal intermediate said first and second terminals, said first and second terminals being connected in circuit with said ''''blue'''' and ''''red'''' guns respectively, and the signal translated by said luminance signal channel being supplied to said ''''blue'''' and ''''red'''' guns via said movable terminal and then via said first and second terminals respectively, wHereby movement of said movable terminal varies the strength of the signal translated by said luminance signal channel and applied to said ''''blue'''' and ''''red'''' guns simultaneously and in opposite directions.
Claim 12
Dependent Claim
32 words
The invention according to claim 10 wherein said first variable resistance means and said first and second terminals are connected to said cathode electrodes of said ''''green'''', ''''blue'''' and ''''red'''' guns respectively.
Claim 13
Dependent Claim
76 words
The invention according to claim 10 wherein said receiver includes ''''red'''', ''''green'''' and ''''blue'''' color signal amplifiers and networks for matrixing the signal translated by said luminance signal channel and ''''red'''', ''''green'''' and ''''blue'''' color difference signals translated by said chrominance signal channel, and means including said first and second variable resistance means for supplying the signal translated by said luminance signal channel to said ''''green'''' and to said ''''blue'''' and ''''red'''' color signal amplifiers respectively.
Claim 14
Dependent Claim
37 words
The invention according to claim 10 wherein said first and second variable resistance means are the sole means in said luminance signal channel for varying the color temperature of the picture reproduced by said cathode ray tube.
References Cited (Backward Citations)
US3457362A
Cited
US3470311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |