Patent US3883780A successfully refreshed from Google Patents.
US3883780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube driving system
Assignee: Panasonic Holdings Corp
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Filing: 1972-12-21
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Granted: 1975-05-13
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Expires: 1992-12-21
Abstract
Abstract A system for driving a cathode-ray tube in a television receiver or the like comprising means for generating an output voltage variable depending on the variation of beam current, means for combining the output voltage of the generating means with a voltage obtained by reducing the high voltage applied to the cathode-ray tube, and means for applying the resultant voltage to the focusing electrode of the cathode-ray tube. Thus, with the increase in the beam current, the voltage applied to the focusing electrode is reduced at a greater rate than the rate of reduction of the high voltage applied to the anode of the cathode-ray tube so that the televised picture can be satisfactorily reproduced.
Inventors
- 👤 Teruhiro Tsukuda
- 👤 Noboru Yasumatsuya
- 👤 Takashi Tsutsumi
- 👤 Taiichi Saeki
- 👤 Yasuyoshi Hirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:39
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33507; G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/10; H02M7/103; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
190 words
In a cathode-ray tube driving circuit which includes a horizontal deflection circuit having a flyback transformer generating flyback pulses, the improvement comprising: a high-voltage rectifying and n-times multiplying circuit having a first input coupled to an output of said flyback transformer to rectify and boost the voltage of said flyback pulses, the nth output of said rectifying and multiplying circuit being coupled to the anode of said cathode-ray tube; a parallel circuit comprising a resistance element and a capacitance element having a first common terminal connected to ground and a second common terminal connected to a second input terminal of said high voltage rectifying and multiplying circuit; resistance means coupled between said second common parallel circuit terminal and a third terminal of said high voltage rectifying and multiplying circuit, the voltage at said third terminal being the flyback pulse input voltage multiplied and rectified m-times (where m and n are positive integers and m < OR = n); and means coupling an intermediate tap of said resistance means to a focusing electrode of said cathode ray tube for applying a voltage derived from said resistance means to said focusing electrode.
Claim 2
Dependent Claim
190 words
In a cathode-ray tube driving circuit which includes a horizontal deflection circuit having a flyback transformer generating flyback pulses, the improvement comprising: a high-voltage rectifying and n-times multiplying circuit having a first input coupled to an output of said flyback transformer to rectify and boost the voltage of said flyback pulses, the nth output of said rectifying and multiplying circuit being coupled to the anode of said cathode-ray tube; a parallel circuit comprising a resistance element and a capacitance element having a first common terminal connected to ground and a second common terminal connected to a second input terminal of said high voltage rectifying and multiplying circuit; resistance means coupled between said second common parallel circuit terminal and a third terminal of said high voltage rectifying and multiplying circuit, the voltage at said third terminal being the flyback pulse input voltage multiplied and rectified m-times (where m and n are positive integers and m < OR = n); and means coupling an intermediate tap of said resistance means to a focusing electrode of said cathode ray tube for applying a voltage derived from said resistance means to said focusing electrode.
Claim 3
Dependent Claim
22 words
The apparatus according to claim 1, wherein said second input of said rectifying and multiplying circuit comprises a common ground terminal thereof.
Claim 4
Dependent Claim
41 words
The apparatus according to claim 2, wherein said resistance means includes a series circuit of fixed resistors and a variable resistor, and the resistance value of said variable resistor is adjusted to regulate the focusing voltage applied to said focusing electrode.
Claim 5
Dependent Claim
191 words
In a cathode-ray tube driving circuit which includes a horizontal deflection circuit having a flyback transformer generating flyback pulses, the improvement comprising: a high-voltage rectifying and n-times multiplying circuit having a first input coupled to an output of said flyback transformer to rectify and boost the voltage of said flyback pulses, the nth output of said rectifying and multiplying circuit being coupled to the anode of said cathode-ray tube; further rectifying means coupled to said flyback transformer for rectifying the flyback pulse signals generated by said transformer; a parallel circuit comprising a resistance element and a capacitance element coupled to the output of said further rectifying means for smoothing the output signal of said further rectifying means; resistance means coupled between the junction of said parallel circuit and said further rectifying means and an output terminal of said high voltage rectifying and multiplying circuit, the voltage at said output terminal being the flyback pulse input voltage multiplied and rectified m-times (where m and n are positive integers and m < or = n); and means applying a voltage derived from said resistance means to a focusing electrode of said cathode-ray tube.
Claim 6
Dependent Claim
191 words
In a cathode-ray tube driving circuit which includes a horizontal deflection circuit having a flyback transformer generating flyback pulses, the improvement comprising: a high-voltage rectifying and n-times multiplying circuit having a first input coupled to an output of said flyback transformer to rectify and boost the voltage of said flyback pulses, the nth output of said rectifying and multiplying circuit being coupled to the anode of said cathode-ray tube; further rectifying means coupled to said flyback transformer for rectifying the flyback pulse signals generated by said transformer; a parallel circuit comprising a resistance element and a capacitance element coupled to the output of said further rectifying means for smoothing the output signal of said further rectifying means; resistance means coupled between the junction of said parallel circuit and said further rectifying means and an output terminal of said high voltage rectifying and multiplying circuit, the voltage at said output terminal being the flyback pulse input voltage multiplied and rectified m-times (where m and n are positive integers and m < or = n); and means applying a voltage derived from said resistance means to a focusing electrode of said cathode-ray tube.
Claim 7
Dependent Claim
52 words
The apparatus according to claim 4, wherein said flyback transformer comprises at least two output windings, said first input of said high voltage rectifying and multiplying circuit being coupled to a first one of said output windings and said further rectifying means being coupled to a second one of said output windings.
Claim 8
Dependent Claim
41 words
The apparatus according to claim 5, wherein said resistance means includes a series circuit of fixed resistors and a variable resistor, and the resistance value of said variable resistor is adjusted to regulate the focusing voltage applied to said focusing electrode.
Claim 9
Dependent Claim
23 words
The apparatus according to claim 5, wherein said parallel resistance-capacitance circuit is coupled between the output of said further rectifying means and ground.
Claim 10
Dependent Claim
185 words
In a cathode-ray tube driving circuit which includes a horizontal deflectiOn circuit having a flyback transformer for generating flyback pulses, wherein said flyback transformer comprises at least one output winding, the improvement comprising: a high voltage rectifying and n-times multiplying circuit having a first input coupled to one terminal of said at least one output winding to rectify and boost the voltage of said flyback pulses, the nth output of said rectifying and multiplying circuit being coupled to the anode of said cathode-ray tube; a parallel circuit comprising a resistance and a capacitance element having a first common terminal connected to ground and a second common terminal connected to a second terminal of said output winding; resistance means coupled between said second common parallel circuit terminal and a third terminal of said high voltage rectifying and multiplying circuit, the voltage at said third terminal being the flyback pulse input voltage multiplied and rectified m-times (where m and n are positive integers and m < or = n); and means applying a voltage derived from said resistance means to a focusing electrode of said cathode-ray tube.
Claim 11
Dependent Claim
185 words
In a cathode-ray tube driving circuit which includes a horizontal deflectiOn circuit having a flyback transformer for generating flyback pulses, wherein said flyback transformer comprises at least one output winding, the improvement comprising: a high voltage rectifying and n-times multiplying circuit having a first input coupled to one terminal of said at least one output winding to rectify and boost the voltage of said flyback pulses, the nth output of said rectifying and multiplying circuit being coupled to the anode of said cathode-ray tube; a parallel circuit comprising a resistance and a capacitance element having a first common terminal connected to ground and a second common terminal connected to a second terminal of said output winding; resistance means coupled between said second common parallel circuit terminal and a third terminal of said high voltage rectifying and multiplying circuit, the voltage at said third terminal being the flyback pulse input voltage multiplied and rectified m-times (where m and n are positive integers and m < or = n); and means applying a voltage derived from said resistance means to a focusing electrode of said cathode-ray tube.
Claim 12
Dependent Claim
41 words
The apparatus according to claim 8, wherein said resistance means includes a series circuit of fixed resistors and a variable resistor, and the resistance value of said variable resistor is adjusted to regulate the focusing voltage applied to said focusing electrode.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |