The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 14, 1983
Filed:
Jun. 30, 1981
Vernon D Beck, Ridgefield, CT (US);
International Business Machines Corporation, Armonk, NY (US);
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.