US4596949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for varying an electrode voltage for a cathode-ray tube
Assignee: US Philips Corp
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Filing: 1984-11-01
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Granted: 1986-06-24
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Expires: 2004-11-01
Abstract
Abstract A device for varying an electrode voltage of a CRT of a color TV includes a novel potentiometer arrangement for adjusting the aforesaid electrode voltage. In known voltage-generating devices the electrode voltage is adjusted by a special potentiometer which can handle several kilovolts. According to the invention, the potentiometer track is constituted by a resistive layer (2) situated inside the interior of the output-voltage feedthrough (10) and the wiper is constituted by the end portion of the high-voltage cable (9) which is inserted into a tubular feedthrough portion and which can slide therein in order to adjust the voltage.
Inventors
- 👤 Francis Faye
- 👤 Georges Prigent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:46
CPC Classifications
H; H01; H01C; H01C10/00; H01C10/30; H01C10/38; H01F; H01F38/00; H01F38/42; H01F2038/423
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
94 words
A device for generating a variable voltage for energizing at least one electrode of a cathode-ray tube comprising: a transformer having a winding for supplying at least one voltage, at least one tubular portion containing at least one electrical cable in contact with the winding, at least one resistive layer arranged inside said tubular portion and having one end connected to a point on the winding, and wherein the electrical cable is provided with means for establishing contact with said layer and the insertion depth of the cable in the tubular portion is adjustable.
Claim 2
Independent Claim
94 words
A device for generating a variable voltage for energizing at least one electrode of a cathode-ray tube comprising: a transformer having a winding for supplying at least one voltage, at least one tubular portion containing at least one electrical cable in contact with the winding, at least one resistive layer arranged inside said tubular portion and having one end connected to a point on the winding, and wherein the electrical cable is provided with means for establishing contact with said layer and the insertion depth of the cable in the tubular portion is adjustable.
Claim 3
Dependent Claim
34 words
A device as claimed in claim 1, characterized in that the means for establishing contact with the layer comprise the end portion of the conductor of the cable, folded back onto its insulating sheath.
Claim 4
Dependent Claim
25 words
A device as claimed in claim 1, wherein the means for establishing contact with the layer comprise a ferrule including at least one elastic strip.
Claim 5
Dependent Claim
24 words
A device as claimed in any claim 1 wherein the resistive layer is situated in a groove in a wall of the tubular portion.
Claim 6
Dependent Claim
23 words
A device as claimed in claim 1 wherein the other end of the resistive layer is connected to another point on the winding.
Claim 7
Dependent Claim
22 words
A device as claimed in claim 1 further comprising an insulating strip provided with a resistive layer situated in said tubular portion.
Claim 8
Dependent Claim
22 words
A device as claimed in claim 1 wherein the resistive layer is deposited directly on the inner wall of the tubular portion.
Claim 9
Dependent Claim
44 words
A device as claimed in claim 1, characterized in that the tubular portion has two recesses for one cable each, which recesses each have a resistive layer, for applying the focussing voltage and the voltage for the second grid of the cathode-ray tube, respectively.
Claim 10
Dependent Claim
48 words
A device as claimed in claim 1 wherein the tubular portion has two recesses for receiving one cable each, which recesses are each provided with an insulating strip carrying a resistive layer with said strips arranged back-to-back between the two recesses, their resistive layers being connected in series.
Claim 11
Dependent Claim
11 words
A device as claimed in claim 1 further comprising cable-locking means.
Claim 12
Dependent Claim
23 words
A device as claimed in claim 2 wherein the resistive layer is located within a groove in a wall of the tubular portion.
Claim 13
Dependent Claim
23 words
A device as claimed in claim 2 wherein the other end of the resistive layer is connected to another point on the winding.
Claim 14
Dependent Claim
23 words
A device as claimed in claim 4 wherein the other end of the resistive layer is connected to another point on the winding.
Claim 15
Dependent Claim
23 words
A device as claimed in claim 2 further comprising an insulating strip provided with a resistive layer and located within said tubular portion.
Claim 16
Dependent Claim
22 words
A device as claimed in claim 4 wherein the resistive layer is deposited directly on an inner wall of the tubular portion.
References Cited (Backward Citations)
DE2830957A1
Cited
US4271463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |