US3798369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instant play television receiver with constant voltage transformer
Assignee: Zenith Electronics LLC
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Filing: 1972-05-22
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Granted: 1974-03-19
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Expires: 1992-05-22
Abstract
Abstract A solid state television receiver incorporates a voltage regulating transformer having a filament winding supplying substantially constant operating voltage to the picture tube filament for prolonging picture tube life. Instant play operation is achieved by providing a filament transformer having a high impedance primary winding, connectable in series with the input of the regulating transformer, and a secondary winding connected in series with the regulating transformer filament winding. The single pole, single throw on-off switch of the receiver is connected across the primary winding of the filament transformer. When the switch is open, the regulating transformer input and the primary of the filament transformer are in series with substantially reduces the voltage across the regulating transformer primary and drops the secondary voltages below operating levels for the television receiver. The filament transformer secondary winding supplies the tube filament with reduced power during standby operation.
Inventors
- 👤 L Dietch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:08
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/66; H04N5/68
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
A television receiver including; a picture tube having a plurality of electrodes and a filament; signal processing means supplying to said picture tube electrodes voltages for reproducing a transmitted television scene; a regulating transformer having an input winding generating flux in a primary magnetic path and a plurality of output windings linking flux in a secondary magnetic path, said regulating transformer supplying substantially constant operating potentials to said signal processing means and to said filament over a wide range of input winding voltage variation; and instant play means maintaining said filament partially energized during receiver inoperative periods, said instant play means including a filament transformer in circuit with said input winding for maintaining said filament partially energized during receiver inoperative periods and simultaneously changing the operating characteristics of said regulating transformer to reduce its output substantially below the level at which said signal processing circuit means are disabled.
Claim 2
Dependent Claim
148 words
A television receiver including; a picture tube having a plurality of electrodes and a filament; signal processing means supplying to said picture tube electrodes voltages for reproducing a transmitted television scene; a regulating transformer having an input winding generating flux in a primary magnetic path and a plurality of output windings linking flux in a secondary magnetic path, said regulating transformer supplying substantially constant operating potentials to said signal processing means and to said filament over a wide range of input winding voltage variation; and instant play means maintaining said filament partially energized during receiver inoperative periods, said instant play means including a filament transformer in circuit with said input winding for maintaining said filament partially energized during receiver inoperative periods and simultaneously changing the operating characteristics of said regulating transformer to reduce its output substantially below the level at which said signal processing circuit means are disabled.
Claim 3
Dependent Claim
72 words
In a television reciver as set forth in claim 1 wherein said instant play means comprises a single pole, single throw on-off switch and wherein said circuit means comprises a filament transformer having a primary winding serially connected with said input winding and a secondary winding serially connected between one of said output windings and said filament, said switch being arranged to short said primary winding to turn the television receiver on.
Claim 4
Dependent Claim
51 words
In a television receiver as set forth in claim 2 wherein the impedance of said primary winding is substantially greater than the impedance of said input winding and wherein said secondary wInding and said one output winding alternately supply voltage to said filament in accordance with the position of said switch.
Claim 5
Dependent Claim
160 words
A television receiver including: a picture tube having a filament; signal processing means including raster producing means, coupled to said picture tube, supplying control and signal information for producing thereon a television scene; a regulating transformer having a primary magnetic path and a resonant secondary magnetic path; a filament winding linking said secondary magnetic path and coupled to said filament, said regulating transformer maintaining substantially constant flux density in said secondary magnetic path and supplying substantially constant voltages to said filament and said signal processing means despite variations in input voltage; and instant play means maintaining said filament partially energized during receiver inoperative periods comprising, a normally disabled filament transformer in circuit with both said regulating transformer and said filament, and a switch enabling said filament transformer for simultaneously supplying reduced voltage to said filament and changing the operating characteristic of said regulating transformer to reduce its output voltages below the level at which said signal processing means are disabled.
Claim 6
Dependent Claim
160 words
A television receiver including: a picture tube having a filament; signal processing means including raster producing means, coupled to said picture tube, supplying control and signal information for producing thereon a television scene; a regulating transformer having a primary magnetic path and a resonant secondary magnetic path; a filament winding linking said secondary magnetic path and coupled to said filament, said regulating transformer maintaining substantially constant flux density in said secondary magnetic path and supplying substantially constant voltages to said filament and said signal processing means despite variations in input voltage; and instant play means maintaining said filament partially energized during receiver inoperative periods comprising, a normally disabled filament transformer in circuit with both said regulating transformer and said filament, and a switch enabling said filament transformer for simultaneously supplying reduced voltage to said filament and changing the operating characteristic of said regulating transformer to reduce its output voltages below the level at which said signal processing means are disabled.
Claim 7
Dependent Claim
54 words
A television receiver as set forth in claim 4 wherein said filament transformer has a secondary winding serially connected with said filament winding and a primary winding serially connectable in series with the input of said regulating transformer, the impedance of said primary winding being substantially higher than the impedance of said input winding.
Claim 8
Dependent Claim
60 words
A television receiver as set forth in claim 5 wherein said switch comprises a single pole, single throw receiver on-off switch connected across the primary winding of said filament transformer, said switch being open and allowing energization of said primary winding when said receiver is in an inoperative state and shorting out said primary winding when said receiver is operative.
Claim 9
Dependent Claim
49 words
A television receiver as set forth in claim 6 wherein said secondary winding generates substantially the entire voltage for maintaining said filament partially energized and said filament winding generates substantially the entire voltage for normal operation of said filament, said windings being alternately energized by operation of said switch.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |