US3754228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Computer output display system
Assignee: MICROGRAPHIC TECHNOLOGY Corp FORMERLY KNOWN AS AJRO ACQUISITION CORPORATION A CORP OF
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Filing: 1970-08-27
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Granted: 1973-08-21
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Expires: 1990-08-27
Abstract
Abstract A computer output display system in which alphanumeric characters are sequentially displayed on the face of a cathode ray tube at discrete locations thereon, so as to produce a printed page-type composition which may be photographed to produce a permanent record of the computer output data. Such a computer output display system comprises a cathode ray tube having two deflection systems, the first, or major deflection system, for deflecting the beam to a particular area of the face of the cathode ray tube, and the second, or minor deflection system, for scanning that particular area in a stepwise manner, the beam of the cathode ray tube being synchronously intensity modulated to produce the image of the desired alphanumeric character. In addition, a multicharacter buffer capable of temporarily storing a sufficient number of characters to allow time for the cathode ray tube beam to be translated across the face of the cathode ray tube, from one end to the other, as would occur at the end of a line, may be provided to permit operation with computer output data that is not line-formated.
Inventors
- 👤 R Hwang
- 👤 R Kahle
- 👤 A Roshon
- 👤 P Seitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:20
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/06; G09G1/14; G09G1/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
104 words
A deflection system for a cathode ray tube responsive to binary coded signals comprising a deflection coil disposed around said cathode ray tube, a plurality of resistors connected in common directly to one terminal of said deflection coil, the other terminal of said deflection coil being grounded, a plurality of electronic switches connected to the other ends of said resistors, each of said electronic switches corresponding to a different place of said binary signals and operative to either ground or apply a voltage to said other end of said resistor in response to said place of said binary signals, said resistors having binary-weighted resistances.
Claim 2
Dependent Claim
104 words
A deflection system for a cathode ray tube responsive to binary coded signals comprising a deflection coil disposed around said cathode ray tube, a plurality of resistors connected in common directly to one terminal of said deflection coil, the other terminal of said deflection coil being grounded, a plurality of electronic switches connected to the other ends of said resistors, each of said electronic switches corresponding to a different place of said binary signals and operative to either ground or apply a voltage to said other end of said resistor in response to said place of said binary signals, said resistors having binary-weighted resistances.
Claim 3
Dependent Claim
223 words
A computer output display system adapted to produce a page-type format display of alphanumeric characters in response to coded electrical input signals corresponding to alphanumeric characters comprising: a cathode ray tube; a high speed deflection coil disposed around Said cathode ray tube; a high sensitivity deflection coil disposed around said cathode ray tube; first, second, third and fourth binary counters, the outputs of said binary counters respectively corresponding to a vertical position in a character-forming matrix, a horizontal position in Said character-formIng matrix, a horizontal character position and a vertical line position; first, second, third and fourth deflection means for producing deflection currents in response to the outputs of said first, second, third and fourth binary counters, respectively; said first and second deflection means being connected to said high speed deflection coil and said third and fourth deflection means being connected to said high sensitivity deflection coil; means periodically advancing said first and second binary counters to scan said character-forming matrix in a stepwise raster; means advancing said third binary counter upon the completion of the scanning of said character-forming matrix: means advancing said fourth binary counter upon completion of the scanning of a line of character-forming matrixes; and means for intensity modulating the beam of said cathode ray tube in response to said input signals and in synchronism with said binary counters.
Claim 4
Dependent Claim
223 words
A computer output display system adapted to produce a page-type format display of alphanumeric characters in response to coded electrical input signals corresponding to alphanumeric characters comprising: a cathode ray tube; a high speed deflection coil disposed around Said cathode ray tube; a high sensitivity deflection coil disposed around said cathode ray tube; first, second, third and fourth binary counters, the outputs of said binary counters respectively corresponding to a vertical position in a character-forming matrix, a horizontal position in Said character-formIng matrix, a horizontal character position and a vertical line position; first, second, third and fourth deflection means for producing deflection currents in response to the outputs of said first, second, third and fourth binary counters, respectively; said first and second deflection means being connected to said high speed deflection coil and said third and fourth deflection means being connected to said high sensitivity deflection coil; means periodically advancing said first and second binary counters to scan said character-forming matrix in a stepwise raster; means advancing said third binary counter upon the completion of the scanning of said character-forming matrix: means advancing said fourth binary counter upon completion of the scanning of a line of character-forming matrixes; and means for intensity modulating the beam of said cathode ray tube in response to said input signals and in synchronism with said binary counters.
Claim 5
Dependent Claim
152 words
Apparatus according to claim 2 wherein said means for intensity modulating the beam of said cathode ray tube comprises memory means containing binary coded signals corresponding to the desired intensities at the various locations in said character-forming matrices for the various alphanumeric characters, said memory means being addressed by said input signals and the output of said second binary counter to produce signals corresponding to the desired intensities of a vertical column of the character-forming matrix of the alphanumeric character corresponding to said input signal, serializer means connected to the output of said memory means and operative in response to the output of said first binary counter to select the particular intensity signal associated with the vertical position of the beam of said cathode ray tube in said character-forming matrix, and means for unblanking or blanking the beam of sAid cathode ray tube in response to the output of said serializer means.
Claim 6
Dependent Claim
57 words
Apparatus according tO claim 3 wherein said memory means further contains a control signal for certain of said characters, said memory means producing said control signal when the output of said Second binary counter is zero, and further comprising means for vertically translating the beam of said cathode ray tube downwardly in response to said control signals.
Claim 7
Dependent Claim
18 words
Apparatus according to claim 3 wherein said input signals are coded in accordance with the EBCDIC coding system.
Claim 8
Dependent Claim
93 words
Apparatus according to claim 5 wherein said EBCDIC input signals comprise six character-determing signals and two quadrant-determining signals and said memory means further contains vertification signals for each of said characters, said memOry means being addressed by the six character-determining signals of said input signals and the output of said second binary counter and being adapted to produce said verfication signals when the output of said second binary counter is zero, and further comprising comparator means for accomplishing a desired result when said verification signals do not correspond to said two quadrant-determining signals.
Claim 9
Dependent Claim
51 words
Apparatus according to claim 2 further comprising buffer means for storing input signals received during the time interval when the beam of said cathode ray tube is being horizontally translated from the end of a line of alphanumeric characters to the start of a subsequent line by said first deflection means.
Claim 10
Dependent Claim
93 words
Apparatus according to claim 7 wherein said buffer means comprises a plurality of buffers connected in series, each of said buffers having a capacity of one of said coded electrical input signals, said input signals being applied to the first of said buffers, means for transferring input signals to the last of said buffers that is empty and means for advancing the signals in said buffers by one buffer towards the last of said buffers upon the display of the alphanumeric characters associated with the input signal in the last of said buffers.
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |