US3714503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonant energy recovery type crt deflection circuit
Assignee: RTX Corp
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Filing: 1970-12-21
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Granted: 1973-01-30
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Expires: 1990-12-21
Abstract
Abstract A winding coupled to the input choke of a resonant energy recovery type deflection circuit with a disconnect diode in series with the choke enables use of a power supply voltage for the circuit which is much lower than what has heretofore been required due to the need to maintain sweep current and flyback voltage at acceptable levels. Another embodiment includes a transductor and a difference amplifier to regulate the deflection circuit yoke capacitor voltage so that raster size remains constant. The circuit is thereby immune to component and power supply voltage variations. Both embodiments utilize mostly elements which are substantially non-dissipative.
Inventors
- 👤 R West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:35
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/62; H03K4/68; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185; H04N3/1856
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
104 words
Yoke deflection current generating means operative in response to a source of DC potential and timing means defining raster sweep and retrace times comprising: a resonant energy recovery deflection circuit including an input choke connected to the source of DC potential; a coil inductively coupled to said input choke; switch means responsive to said timing means for connecting said coil to the source of DC potential during raster sweep time, said coil inducing a voltage in said choke; and isolation means responsive to voltage induced in said choke by said coil for disconnecting said input choke from said DC potential during raster sweep time.
Claim 2
Dependent Claim
104 words
Yoke deflection current generating means operative in response to a source of DC potential and timing means defining raster sweep and retrace times comprising: a resonant energy recovery deflection circuit including an input choke connected to the source of DC potential; a coil inductively coupled to said input choke; switch means responsive to said timing means for connecting said coil to the source of DC potential during raster sweep time, said coil inducing a voltage in said choke; and isolation means responsive to voltage induced in said choke by said coil for disconnecting said input choke from said DC potential during raster sweep time.
Claim 3
Dependent Claim
104 words
Yoke deflection current generating means operative in response to a source of DC potential and timing means defining raster sweep and retrace times comprising: a resonant energy recovery deflection circuit including an input choke connected to the source of DC potential; a coil inductively coupled to said input choke; switch means responsive to said timing means for connecting said coil to the source of DC potential during raster sweep time, said coil inducing a voltage in said choke; and isolation means responsive to voltage induced in said choke by said coil for disconnecting said input choke from said DC potential during raster sweep time.
Claim 4
Dependent Claim
104 words
Yoke deflection current generating means operative in response to a source of DC potential and timing means defining raster sweep and retrace times comprising: a resonant energy recovery deflection circuit including an input choke connected to the source of DC potential; a coil inductively coupled to said input choke; switch means responsive to said timing means for connecting said coil to the source of DC potential during raster sweep time, said coil inducing a voltage in said choke; and isolation means responsive to voltage induced in said choke by said coil for disconnecting said input choke from said DC potential during raster sweep time.
Claim 5
Dependent Claim
26 words
Yoke deflection current generating means according to claim 1 wherein: said isolation means comprises a diode connected between the source of DC potential and said choke.
Claim 6
Dependent Claim
109 words
Yoke deflection current generating means according to claim 1 wherein said resonant energy deflection circuit additionally comprises: a yoke; a retrace capacitor connected to said yoke for storing energy provided by said yoke and substantially returning the energy to the yoke during the retrace time; a yoke capacitor connected in series with said retrace capacitor and said yoke for substantially receiving the energy from said yoke during the first half of the raster sweep time and substantially returning the energy to said yoke during the second half of the raster sweep time; and means responsive to said timing means for shorting said retrace capacitor during the raster sweep time.
Claim 7
Dependent Claim
162 words
Yoke deflection current generating means operative in response to a source of DC potential comprising: a resonant energy recovery deflection circuit having a yoke with a yoke capacitor connected in series with said yoke; means including a coil for coupling energy from the source of DC potential into said resonant energy recovery deflection circuit; and means connected in series with said coil and responsive to the voltage across said yoke capacitor for regulating the voltage across said coil with respect to the voltage of the source of DC potential, thereby to maintain raster size substantially constant, comprising a transductor in series with the coil, a difference amplifier including a reference voltage input to drive the input winding of the transductor, and means connecting a fraction of the potential across said yoke capacitor to said difference amplifier so that the current driving transductor is a function of the difference between the fraction of the potential across said yoke capacitor and the reference voltage.
Claim 8
Dependent Claim
162 words
Yoke deflection current generating means operative in response to a source of DC potential comprising: a resonant energy recovery deflection circuit having a yoke with a yoke capacitor connected in series with said yoke; means including a coil for coupling energy from the source of DC potential into said resonant energy recovery deflection circuit; and means connected in series with said coil and responsive to the voltage across said yoke capacitor for regulating the voltage across said coil with respect to the voltage of the source of DC potential, thereby to maintain raster size substantially constant, comprising a transductor in series with the coil, a difference amplifier including a reference voltage input to drive the input winding of the transductor, and means connecting a fraction of the potential across said yoke capacitor to said difference amplifier so that the current driving transductor is a function of the difference between the fraction of the potential across said yoke capacitor and the reference voltage.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |