US4472662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deflection circuit
Assignee: Terminal Data Corp
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Filing: 1983-06-10
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Granted: 1984-09-18
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Expires: 2003-06-10
Abstract
Abstract A high efficiency cathode-ray tube magnetic deflection circuit, providing a sawtooth current waveform at a frequency of 100 kilohertz that includes a FET transistor (11) connected to an anti-phased step-down transformer (15,16,17) for driving an output transistor (18). A co-phased step-up transformer (33,34,35) connected to the deflection yoke (19) provides deflection "S" correction, and also a dynamic focus waveform. The transformers have litz wire windings.
Inventors
- 👤 Karol Freed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:39
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/62; H03K4/64
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A cathode-ray tube magnetic deflection circuit, comprising; (a) plural interconnected triggerable relaxation oscillator means (2,7,8), (b) FET means (11) connected to said oscillator means, (c) a step-down transformer (15,16,17), connected to said FET means, (d) transistor means (18) connected to said step-down transformer, for actuation thereby, (e) a cathode-ray tube deflection yoke (19) connected to said transistor means, and (f) a step-up transformer (33,34,35) also connected to the deflection yoke for modifying the scanning velocity of the cathode-ray tube beam to result in a linear scanning deflection.
Claim 2
Dependent Claim
87 words
A cathode-ray tube magnetic deflection circuit, comprising; (a) plural interconnected triggerable relaxation oscillator means (2,7,8), (b) FET means (11) connected to said oscillator means, (c) a step-down transformer (15,16,17), connected to said FET means, (d) transistor means (18) connected to said step-down transformer, for actuation thereby, (e) a cathode-ray tube deflection yoke (19) connected to said transistor means, and (f) a step-up transformer (33,34,35) also connected to the deflection yoke for modifying the scanning velocity of the cathode-ray tube beam to result in a linear scanning deflection.
Claim 3
Dependent Claim
28 words
The deflection circuit of claim 1, in which; (a) said plural triggerable relaxation oscillator means (2,7,8) are one-shot oscillators, and (b) the one-shot oscillators are connected in cascade.
Claim 4
Dependent Claim
28 words
The deflection circuit of claim 1, in which; (a) a sawtooth waveform of current of approximately 100 kilohertz frequency is caused to flow through the deflection yoke (19).
Claim 5
Dependent Claim
48 words
The deflection circuit of claim 1, which additionally includes; (a) a parabolic waveforming circuit (40,42) connected to said step-up transformer (35) and to the focus means of the cathode-ray tube (36), for maintaining the focus of the beam constant with deflection thereof by current in said deflection yoke.
Claim 6
Dependent Claim
50 words
The deflection circuit of claim 1, which additionally includes; (a) a transistor (10) connected as the output of the last said plural triggerable relaxation oscillator means, and (b) directly to a voltage source (6), whereby the voltage output of said transistor is approximately equal to the voltage of said source.
Claim 7
Dependent Claim
35 words
The deflection circuit of claim 1, in which; (a) said step-down transformer (15,16,17) has a turns ratio of approximately 6 to 1, and (b) the secondary (17) is anti-phased with respect to the primary (15).
Claim 8
Dependent Claim
34 words
The deflection circuit of claim 6, in which; (a) the windings (15,17) of said step-down transformer are wound with litz wire, and (b) the core (16) of said step-down transformer is a ferrite toroid.
Claim 9
Dependent Claim
35 words
The deflection circuit of claim 1, in which; (a) said step-up transformer (33,34,35) has a turns ratio of approximately 16 to 1, and (b) the secondary (35) is co-phased with respect to the primary (33).
Claim 10
Dependent Claim
34 words
The deflection circuit of claim 8, in which; (a) the windings (33,35) of said step-up transformer are wound with litz wire, and (b) the core (34) of said step-up transformer is a ferrite toroid.
References Cited (Backward Citations)
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US4323826A
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US4227125A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |