Patent US3585299A successfully refreshed from Google Patents.
US3585299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Picture display arrangement provided with a display tube
Assignee: US Philips Corp
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Filing: 1968-10-16
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Granted: 1971-06-15
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Expires: 1988-10-16
Abstract
Abstract In a TV display system, a circuit for regulating the voltage at the output terminals of the high voltage supply for the CRT acceleration anode. The circuit includes a VDR and a resistor in series circuit across said output terminals and a voltage divider network connected across a source of DC voltage. A diode is connected between a point on the series circuit and a point on the voltage divider with a polarity and in a manner such that the diode is cut off at the nominal operating voltage at said terminals and is rendered conductive when the voltage increases above a given value. The beam intensity electrode of the CRT is connected to a point on the voltage divider such that conduction of the diode increases the electrode voltage to increase the electron beam intensity thereby increasing the loading effect on the high voltage supply.
Inventors
- 👤 Antonius Boekhorst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:25
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
182 words
A picture display arrangement comprising a cathode-ray display tube, a high-voltage generator having output terminals between which a high DC voltage is generated for the display tube, means connecting a series arrangement of an element having a nonlinear current-voltage characteristic and a resistor between said terminals, a voltage divider connected across a DC source of relatively constant voltage, means coNnecting an electrode of the display tube that controls the intensity of the electron beam to a point on said voltage divider at which a low DC voltage appears, and a high-voltage safety circuit comprising a unidirectional current conducting element connected between a tapping on the series arrangement and a terminal of the voltage divider across which a more or less constant voltage appears and in a manner such that the unidirectional element is rendered conducting when the high DC voltage exceeds a given maximum value which is related to the value of said more or less constant voltage, said unidirectional element thereby applying a DC voltage to said tube electrode via the voltage divider for increasing the intensity of the electron beam.
Claim 2
Dependent Claim
182 words
A picture display arrangement comprising a cathode-ray display tube, a high-voltage generator having output terminals between which a high DC voltage is generated for the display tube, means connecting a series arrangement of an element having a nonlinear current-voltage characteristic and a resistor between said terminals, a voltage divider connected across a DC source of relatively constant voltage, means coNnecting an electrode of the display tube that controls the intensity of the electron beam to a point on said voltage divider at which a low DC voltage appears, and a high-voltage safety circuit comprising a unidirectional current conducting element connected between a tapping on the series arrangement and a terminal of the voltage divider across which a more or less constant voltage appears and in a manner such that the unidirectional element is rendered conducting when the high DC voltage exceeds a given maximum value which is related to the value of said more or less constant voltage, said unidirectional element thereby applying a DC voltage to said tube electrode via the voltage divider for increasing the intensity of the electron beam.
Claim 3
Dependent Claim
34 words
An arrangement as claimed in claim 1 wherein said nonlinear element comprises a voltage dependent resistor and said unidirectional element comprises a diode with its cathode connected to said terminal of the voltage divider.
Claim 4
Dependent Claim
72 words
An arrangement as claimed in claim 2 wherein said high-voltage generator comprises the horizontal deflection circuit of the picture display arrangement, and a control circuit having an input terminal connected to a point on said series arrangement and an output terminal coupled to said horizontal deflection circuit for applying a control voltage thereto by means of which said deflection circuit regulates the value of the high DC voltage at said output terminals.
Claim 5
Dependent Claim
178 words
A cathode-ray tube display system comprising, a source of high DC voltage for supplying a nominal operating voltage at a pair of output terminals, means connecting the accelerating anode of said tube across said terminals, a first voltage divider network comprising an element having a nonlinear current-voltage characteristic and a resistor connected in series across said output terminals, a second source of DC voltage, a second voltage divider network connected across said second voltage source, a unidirectional current element connected between a point on said first voltage divider network and a point on said second voltage divider network with a polarity and in a manner such that the unidirectional element is nonconductive at said nominal operating voltage and is rendered conductive upon a preselected increase of said high DC voltage above the nominal voltage, and means connecting a beam intensity electrode of said tube to a point on said second voltage divider network such that conduction of said unidirectional element increases the DC voltage applied to said electrode thereby increasing the election beam intensity of the cathode-ray tube.
Claim 6
Dependent Claim
178 words
A cathode-ray tube display system comprising, a source of high DC voltage for supplying a nominal operating voltage at a pair of output terminals, means connecting the accelerating anode of said tube across said terminals, a first voltage divider network comprising an element having a nonlinear current-voltage characteristic and a resistor connected in series across said output terminals, a second source of DC voltage, a second voltage divider network connected across said second voltage source, a unidirectional current element connected between a point on said first voltage divider network and a point on said second voltage divider network with a polarity and in a manner such that the unidirectional element is nonconductive at said nominal operating voltage and is rendered conductive upon a preselected increase of said high DC voltage above the nominal voltage, and means connecting a beam intensity electrode of said tube to a point on said second voltage divider network such that conduction of said unidirectional element increases the DC voltage applied to said electrode thereby increasing the election beam intensity of the cathode-ray tube.
Claim 7
Dependent Claim
35 words
A display system as claimed in claim 4 wherein said nonlinear element comprises a voltage dependent resistor and said second voltage divider network includes a potentiometer having an arm connected to said beam intensity electrode.
References Cited (Backward Citations)
US3375436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |