Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1981-06-30
1983-06-14
Trafton, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
315371, 315382, 340724, 340812, G09G 120
Patent
active
043886191
ABSTRACT:
A multibeam matrix array cathode ray tube having diminished rotational and focused distortion. In a multibeam cathode ray tube having a flat or planar electron beam emitter means arranged to project a two-dimensional array of beams, deflection means and stigmator correction means are provided. In addition, a novel split focus coil is provided for correcting distortion due to undesired rotation of the array of beams. By dynamically supplying opposing currents in the two halves of the split focus coil, rotational distortion may be compensated for, while adjustments are automatically made for changes of focus due to the introduction of rotational correction. Correctional currents are dynamically supplied to the split coils as a function of the matrix beam displacement on the cathode ray tube face.
REFERENCES:
patent: 2539492 (1951-01-01), Smyth
patent: 2574946 (1951-11-01), White
patent: 3421044 (1969-01-01), Murdock et al.
patent: 3487164 (1969-12-01), Eggert
patent: 3961223 (1976-06-01), Ray et al.
International Business Machines - Corporation
Schlemmer Roy R.
Trafton David L.
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