US3579023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus
Assignee: Honeywell Inc
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Filing: 1969-03-28
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Granted: 1971-05-18
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Expires: 1989-03-28
Abstract
Abstract A high-speed digital deflection switch system incorporating a digital-to-analog conversion circuit comprising a plurality of resistors in a ladder network which are switched into and out of the circuit by digital input signals for providing current changes through a magnetic deflection coil. This circuitry is accompanied by linearizing capacitors to produce a more constant deflection rate and further includes a circuit for changing the character size from large to small letters.
Inventors
- 👤 Morton H Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:04
CPC Classifications
H; H03; H03M; H03M1/00; G; G09; G09G; G09G1/00; G09G1/06; G09G1/08; G09G1/10; H03M1/12; H03M1/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
236 words
Apparatus for producing a visual display formed of a plurality of linear display segments produced in response to digital signals, the apparatus including a cathode-ray tube having vertical and horizontal beam deflection coils each having first and second ends, the apparatus comprising: power supply means including first and second terminals for supplying current to circuitry connected therebetween; first and second digital-to-analog conversion means, each having input terminal means and first and second further terminals, each digital-to-analog conversion means comprising a plurality of switchable current paths connected in parallel between the first and second further terminals, each current path including only passive elements and a series-connected switch having a control terminal connected to the input terminal means, the switch conducting current only in response to an appropriate digital signal at the input terminal means, the first further terminals of said first and second digital-to-analog conversion means connected directly to the first ends of the horizontal and vertical deflection coils respectively, the second farther terminals of said first and second digital-to-analog conversion means connected directly to the first terminal of said power supply means; and connecting means for connecting the second ends of the horizontal and vertical deflection coils to the second terminal of said power supply means, said connecting means including only passive elements in current paths between the second terminal of said power supply means and the second ends of the horizontal and vertical deflection coils.
Claim 2
Dependent Claim
236 words
Apparatus for producing a visual display formed of a plurality of linear display segments produced in response to digital signals, the apparatus including a cathode-ray tube having vertical and horizontal beam deflection coils each having first and second ends, the apparatus comprising: power supply means including first and second terminals for supplying current to circuitry connected therebetween; first and second digital-to-analog conversion means, each having input terminal means and first and second further terminals, each digital-to-analog conversion means comprising a plurality of switchable current paths connected in parallel between the first and second further terminals, each current path including only passive elements and a series-connected switch having a control terminal connected to the input terminal means, the switch conducting current only in response to an appropriate digital signal at the input terminal means, the first further terminals of said first and second digital-to-analog conversion means connected directly to the first ends of the horizontal and vertical deflection coils respectively, the second farther terminals of said first and second digital-to-analog conversion means connected directly to the first terminal of said power supply means; and connecting means for connecting the second ends of the horizontal and vertical deflection coils to the second terminal of said power supply means, said connecting means including only passive elements in current paths between the second terminal of said power supply means and the second ends of the horizontal and vertical deflection coils.
Claim 3
Dependent Claim
202 words
Apparatus for producing a visual display formed of a plurality of linear display segments generated in response to digital signals, the apparatus including a cathode-ray tube with a magnetic beam deflection coil having first and second ends, the apparatus comprising: power supply means including first and second terminals for supplying current to circuitry connected therebetween; digital-to-analog conversion means having input terminal means and first and second further terminals, said digital-to-analog conversion means comprising a plurality of switchable current paths connected in parallel between the first and second further terminals, each current path including only passive elements connected in series with a switch having a control terminal connected to the input terminal means, the switch conducting current only in response to a predetermined digital signal at the input terminal means, the first further terminal of said digital-to-analog conversion means being connected directly to the first end of the deflection coil, the second further terminal of the digital-to-analog conversion means being connected directly to the first terminal of said power supply means; and connecting means For providing a current path between the second end of the deflection coil and the second terminal of said power supply means, the current path including only passive elements.
Claim 4
Dependent Claim
202 words
Apparatus for producing a visual display formed of a plurality of linear display segments generated in response to digital signals, the apparatus including a cathode-ray tube with a magnetic beam deflection coil having first and second ends, the apparatus comprising: power supply means including first and second terminals for supplying current to circuitry connected therebetween; digital-to-analog conversion means having input terminal means and first and second further terminals, said digital-to-analog conversion means comprising a plurality of switchable current paths connected in parallel between the first and second further terminals, each current path including only passive elements connected in series with a switch having a control terminal connected to the input terminal means, the switch conducting current only in response to a predetermined digital signal at the input terminal means, the first further terminal of said digital-to-analog conversion means being connected directly to the first end of the deflection coil, the second further terminal of the digital-to-analog conversion means being connected directly to the first terminal of said power supply means; and connecting means For providing a current path between the second end of the deflection coil and the second terminal of said power supply means, the current path including only passive elements.
Claim 5
Dependent Claim
40 words
The apparatus of claim 2 wherein the current paths in said digital-to-analog conversion means each include a capacitor having the value required to produce a substantially linearly increasing current through the deflection coil until a predetermined current therethrough is reached.
Claim 6
Dependent Claim
28 words
The apparatus of claim 3 wherein the current paths in said digital-to-analog conversion means each include a resistor connected in parallel with the capacitor in the current path.
Claim 7
Dependent Claim
86 words
The apparatus of claim 4 wherein: said power supply means is operable to produce a voltage of value V between the first and second terminals thereof; the resistor in each current path in the digital-to-analog conversion means has a preselected value; and the value of the capacitor in each current path is chosen so that the capacitor becomes substantially fully charged when the current in the deflection coil reaches a value slightly less than V divided by the value of the resistor in the current path.
Claim 8
Dependent Claim
41 words
The apparatus of claim 5 further including means cooperating with said connecting means for altering the voltage supplied to the deflection coil to change the beam deflections produced by given signals at the input terminal means of said digital-to-analog conversion means.
Claim 9
Dependent Claim
92 words
The apparatus of claim 6 wherein said connecting means and said means cooperating therewith includes: a resistor connected between the second terminal of said power supply means and the second end of the deflection coil; and a resistor and a switch connected in series between the second end of the deflection coil and the first terminal of said power supply means, said switch operable to provide a current path between the second end of the deflection coil and the first terminal of said power supply means in response to a control signal.
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |