Patent US3962604A successfully refreshed from Google Patents.
US3962604A
Expired / Lapsed
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Deflection system for a cathode ray tube
Assignee: Alcatel CIT SA
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Filing: 1974-06-12
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Granted: 1976-06-08
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Expires: 1994-06-12
Abstract
Abstract Deflection system for a cathode ray tube used in synthetic generators of curves comprising a vertical deflection device and a horizontal deflection device. Each of the devices comprises a main loop with a main deflection coil producing a deflection having a high amplitude with a slow variation and a secondary loop with a secondary coil producing a deflection having a low amplitude with a rapid variation; the main loop is fed by a deflection signal and produces an error signal feeding the secondary loop. Compensation for the delay and for the faults inserted by the main loop and use of only one deflection signal for each device is provided.
Inventors
- 👤 Roger Guenard
- 👤 Jean-Claude Bonno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:41
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
188 words
In a deflection system for a cathode ray tube comprising a horizontal deflection device and a vertical deflection device each of these deflection devices comprising a slow response deflection circuit and a rapid response deflection circuit, said slow response deflection circuit comprising, in series, a subtractor having a - input and a + input, a limited band direct current amplifier, a deflection coil and a measuring resistor connected to ground, the point common to the resistor and the coil being connected to the - input of the subtractor and said subtractor receiving on its + input a deflection signal, and said rapid response deflection circuit comprising a subtractor having a + input and a - input and an output connected to the input of a wide band direct current amplifier supplying deflection means and a negative feed back means whose output is connected to the - input of the subtractor, the improvement comprising said + input of said subtractor of the rapid response deflection circuit being connected to the output of said subtractor of the slow response deflection circuit in each of said horizontal and vertical deflection devices.
Claim 2
Dependent Claim
188 words
In a deflection system for a cathode ray tube comprising a horizontal deflection device and a vertical deflection device each of these deflection devices comprising a slow response deflection circuit and a rapid response deflection circuit, said slow response deflection circuit comprising, in series, a subtractor having a - input and a + input, a limited band direct current amplifier, a deflection coil and a measuring resistor connected to ground, the point common to the resistor and the coil being connected to the - input of the subtractor and said subtractor receiving on its + input a deflection signal, and said rapid response deflection circuit comprising a subtractor having a + input and a - input and an output connected to the input of a wide band direct current amplifier supplying deflection means and a negative feed back means whose output is connected to the - input of the subtractor, the improvement comprising said + input of said subtractor of the rapid response deflection circuit being connected to the output of said subtractor of the slow response deflection circuit in each of said horizontal and vertical deflection devices.
Claim 3
Dependent Claim
92 words
Deflection system for a cathode ray tube according to claim 1, characterized in that the deflection means of the rapid response deflection circuit are constituted by a coil, one of whose ends is connected to the output of the direct current amplifier and whose other end is connected to the negative feed back means, said negative feed back means being constituted by a resistor connected to ground, the common point of said resistor with the deflection coil being connected to the - input of the subtractor of said rapid response deflection circuit.
Claim 4
Dependent Claim
104 words
Deflection system for a cathode ray tube according to claim 1, characterized in that said wide band direct current amplifier of the rapid response deflection circuit comprises two symmetrical outputs connected to the deflection means of said rapid response deflection circuit, said deflection means of said circuit being constituted by plates and wherein said negative feed back means of said circuit are constituted by an auxiliary subtractor whose inputs are connected to said two symmetrical outputs of the direct current amplifier and whose output is connected to the - input of said subtractor feeding the direct current amplifier of said rapid response deflection circuit.
Claim 5
Dependent Claim
93 words
Deflection system for a cathode ray tube according to claim 1, comprising two theshold devices each connected to the output of the subtractor of each slow response deflection circuit of said horizontal and vertical deflection devices, each of said two threshold devices providing a signal upon receiving signals having a lower value than a predetermined saturation signal So for the rapid response circuits; and an AND circuit fed by said two threshold devices, said AND circuit providing an output signal for controlling the application of signals to said horizontal and vertical deflection devices.
Claim 6
Dependent Claim
92 words
Deflection system for a cathode ray tube according to claim 2, comprising two threshold devices, each connected to the output of the subtractor of each slow response deflection circuit of said horizontal and vertical deflection devices, each of said two threshold devices providing a signal upon receiving signals having a lower value than a predetermined saturation signal So for the rapid response circuits; and an AND circuit fed by two threshold devices, said AND circuit providing an output signal for controlling the application of signals to said horizontal and vertical deflection devices.
Claim 7
Dependent Claim
103 words
A deflection system for a cathode ray tube comprising a horizontal deflection device and a vertical deflection device, each of said horizontal and vertical deflection devices including a slow response deflection circuit and a rapid response deflection circuit, means for applying a deflection signal to said slow response deflection circuit of each of said horizontal and vertical deflection devices, and means for applying a control signal generated by said slow respsonse deflection circuit to said rapid response deflection circuit of each of said horizontal and vertical deflection devices, said control signal being a measure of signal delay in said slow response deflection circuit.
Claim 8
Dependent Claim
103 words
A deflection system for a cathode ray tube comprising a horizontal deflection device and a vertical deflection device, each of said horizontal and vertical deflection devices including a slow response deflection circuit and a rapid response deflection circuit, means for applying a deflection signal to said slow response deflection circuit of each of said horizontal and vertical deflection devices, and means for applying a control signal generated by said slow respsonse deflection circuit to said rapid response deflection circuit of each of said horizontal and vertical deflection devices, said control signal being a measure of signal delay in said slow response deflection circuit.
Claim 9
Dependent Claim
26 words
A deflection device according to claim 6, wherein said means for applying a deflection signal only applies said deflection signal to said slow response deflection circuit.
References Cited (Backward Citations)
US3449620A
Cited
US3757162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |