Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1989-06-07
1990-01-23
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
358 67, 358 69, 315 10, H01J 2970, H01J 2976
Patent
active
048960829
ABSTRACT:
In a circuit arrangement for correcting a raster distortion in a cathode ray tube, at least one vertical perforated, index strip of a sensor is arranged at a corresponding margin of a picture producing screen of the cathode ray tube. An index signal that is indicative when the electron beam passes the index strip is generated. The index signal is coupled through an enclosure of the cathode ray tube in a nonconductive manner to a second electrode that is located outside the enclosure. A comparator circuit is used for comparing the index signal with a line deflection representative signal to generate a control signal that corrects the raster distortion.
REFERENCES:
patent: 4159484 (1979-06-01), Strathman
patent: 4352047 (1982-09-01), Imayasu et al.
patent: 4369396 (1983-06-01), Judd
patent: 4593308 (1986-06-01), Kemplin
Japanese Pat. Appl. No. SHO 61-136381-Eicho Shima, "Screen Distortion Correcting Device".
German Pat. Appl. No. DE-3136029A1-Nersthemimer et al., "Circuit Configuration for Reproducing A Television Picture With Lines Alternatingly In the Opposite Direction".
Japanese Patent Appl. No. 62-122463-T. Matyumoto, "Cathode Ray Tube".
U.K. Pat. Appl. No. GB2102258A-D. Denham, "Closed-Loop Correction System For CRT-type Display".
Blum Theodore M.
Deutsche Thomson-Brandt GmbH
Henig Sammy S.
Laks Joseph J.
Tripoli Joseph S.
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