US3602768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual mode deflection amplifier
Assignee: Lockheed Martin Corp
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Filing: 1969-03-27
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Granted: 1971-08-31
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Expires: 1989-03-27
Abstract
Abstract There is disclosed a deflection amplifier for a cathode-ray ray tube which normally acts as a linear amplifier to enable operation in a random access mode. However, an input signal commanding the beam to move linearly across the screen followed by an input signal commanding a fast return, or fly back, automatically shifts operation to an energy recovery mode in which energy is transferred from the deflection coil to a capacitor and back again. During this operation, the power supply and the input stages are automatically disconnected, but are automatically reconnected as the fly back is completed.
Inventors
- 👤 Roy M Williams Jr
- 👤 Crawford M Kus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:16
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/04; H; H03; H03F; H03F3/00; H03F3/30; H03F3/3069; H03F3/3076; H03F3/3079; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/69; H03K4/693; H03K6/00; H03K6/02; H04; H04N; H04N3/00; H04N3/10; H04N3/30
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
182 words
A deflection amplifier for energizing the deflection coil of a cathode ray tube so as to move the beam of said tube in either a random access mode or in a raster mode, comprising, an input section for receiving an input signal indicative of the desired motion of said beam, an output section connected to said input section and including a plurality of transistors connected in complementary symmetrical emitter follower configuration with all of the emitters returned to a common conductor, said coil being connected between said common conductor and ground, a capacitor having one terminal connected to ground, and a diode connected between the other terminal of said capacitor and said common conductor, whereby an input signal commanding a rapid reversal of the direction of motion of said beam cuts off the flow of current to said coil causing a polarity reversal of the voltage across said coil, and whereby a discharge path for said coils is provided through said capacitor and said diode, and whereby said capacitor can discharge through a path including said coil and one of said transistors.
Claim 2
Dependent Claim
182 words
A deflection amplifier for energizing the deflection coil of a cathode ray tube so as to move the beam of said tube in either a random access mode or in a raster mode, comprising, an input section for receiving an input signal indicative of the desired motion of said beam, an output section connected to said input section and including a plurality of transistors connected in complementary symmetrical emitter follower configuration with all of the emitters returned to a common conductor, said coil being connected between said common conductor and ground, a capacitor having one terminal connected to ground, and a diode connected between the other terminal of said capacitor and said common conductor, whereby an input signal commanding a rapid reversal of the direction of motion of said beam cuts off the flow of current to said coil causing a polarity reversal of the voltage across said coil, and whereby a discharge path for said coils is provided through said capacitor and said diode, and whereby said capacitor can discharge through a path including said coil and one of said transistors.
Claim 3
Dependent Claim
30 words
A deflection amplifier in accordance with claim 1 including means responsive to the polarity reversal of the voltage across said coil for disconnecting said input section from said output section.
Claim 4
Dependent Claim
45 words
A deflection amplifier in accordance with claim 1 in which said input section is connectEd to said output section through a diode which is forward biased during normal operation but which is back biased upon reversal of the polarity of the voltage across said coil.
Claim 5
Dependent Claim
38 words
A deflection amplifier in accordance with claim 1 in which said input section includes means for comparing said input signal with a signal indicative of current through said coil to generate an error signal for controlling said amplifier.
Claim 6
Dependent Claim
52 words
A deflection amplifier in accordance with claim 1 in which said input section has a bias circuit including a Zener diode and in which the effect of the inherent capacitance of said Zener diode is reduced by connecting a conventional diode in series therewith and shunting the series combination with a resistor.
Claim 7
Dependent Claim
64 words
A deflection amplifier in accordance with claim 1 in which said output section includes a plurality of NPN transistors having their collectors energized from a source of positive potential and their emitters returned to said common conductor and which also includes a plurality of PNP transistors having their collectors energized from a source of negative potential and their emitters returned to said common conductor.
Claim 8
Dependent Claim
32 words
A deflection amplifier in accordance with claim 6, in which one of said NPN transistors is maintained nonconductive during discharge of said capacitor by applying reverse bias to the base-emitter circuit thereof.
Claim 9
Dependent Claim
40 words
A deflection amplifier in accordance with claim 6 in which the cathode of said diode is connected to said common conductor and the anode of said diode is connected to said capacitor and to the collectors of said PNP transistors.
Claim 10
Dependent Claim
44 words
A deflection amplifier in accordance with claim 8 which includes another diode connected between said source of negative potential and said collectors of said PNP transistors, whereby discharge of said coil back biases said last named diode and isolates said source of negative potential.
Claim 11
Dependent Claim
63 words
A deflection amplifier in accordance with claim 9 in which said input section is connected to said PNP transistors through an additional diode connected to be normally forward biased but which is back biased by the presence of a predetermined negative potential on said common conductor, whereby said input section is isolated from said output section for the duration of said predetermined potential.
Claim 12
Dependent Claim
33 words
A deflection amplifier in accordance with claim 10 in which forward biasing of the collector-base diode of one of said PNP transistors is prevented by a diode connected in series with said collector.
Claim 13
Dependent Claim
129 words
A deflection amplifier for energizing the deflection coil of a cathode ray tube, comprising a first path for the flow of current from a source through said coil, means for controlling the flow of current through said path and said coil in accordance with an input signal, a capacitor, and a diode, said capacitor and said diode being connected in series with each other and with the series combination shunting said coil, said diode being poled so as to prevent the charging of said capacitor from said source but so as to be rendered conductive by an interruption of the flow of current through said first path and the resulting voltage polarity reversal across said coil thereby establishing a second path enabling said coil to discharge into said capacitor.
Claim 14
Dependent Claim
129 words
A deflection amplifier for energizing the deflection coil of a cathode ray tube, comprising a first path for the flow of current from a source through said coil, means for controlling the flow of current through said path and said coil in accordance with an input signal, a capacitor, and a diode, said capacitor and said diode being connected in series with each other and with the series combination shunting said coil, said diode being poled so as to prevent the charging of said capacitor from said source but so as to be rendered conductive by an interruption of the flow of current through said first path and the resulting voltage polarity reversal across said coil thereby establishing a second path enabling said coil to discharge into said capacitor.
Claim 15
Dependent Claim
133 words
A deflection amplifier for energizing the deflection coil of a cathode ray tube, comprising, first and second control means connected to said coil for controlling the flow of current therethrough in first and second directions in accordance with the relative conductivity of said control means, circuit means connected to said first and second control means for controlling the relative conductivity thereof in response to an input signal, a capacitor, means responsive to a sudden reduction in the conductivity of said first control means for establishing a first path through which said coil may discharge into and charge said capacitor, and means responsive to the Discharging of said coil and the charging of said capacitor for establishing a second path including said second control means through which said capacitor may discharge into said coil.
Claim 16
Dependent Claim
133 words
A deflection amplifier for energizing the deflection coil of a cathode ray tube, comprising, first and second control means connected to said coil for controlling the flow of current therethrough in first and second directions in accordance with the relative conductivity of said control means, circuit means connected to said first and second control means for controlling the relative conductivity thereof in response to an input signal, a capacitor, means responsive to a sudden reduction in the conductivity of said first control means for establishing a first path through which said coil may discharge into and charge said capacitor, and means responsive to the Discharging of said coil and the charging of said capacitor for establishing a second path including said second control means through which said capacitor may discharge into said coil.
Claim 17
Dependent Claim
67 words
A deflection amplifier in accordance with claim 13 in which said first path includes a diode to which is applied a back bias large enough to maintain said diode nonconductive during gradual changes in the conductivity of said first control means but small enough to be overcome by the polarity reversal across said coil which occurs upon sudden reduction in the conductivity of said first control means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |