Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1995-06-07
1996-12-10
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315 8, H01J 2956
Patent
active
055834019
ABSTRACT:
By providing a plurality of landing correction coil pairs each comprised of a correction coil in the x-axis direction and a correction coil in the y-axis direction at four peripheral corner portions of the cathode ray tube (CRT) and by controlling the direction and magnitude of the resultant vector of the correction magnetic fields generated by the x-axis direction correction coil and the y-axis direction correction coil, the influence of the geomagnetism is canceled to allow a high-accuracy landing correction to be achieved. Furthermore, by detecting the chromaticity and luminance information on the screen to obtain a mislanding quantity and by forming a correction current corresponding to the quantity through the aforementioned correction means to perform an automatic correction to allow a quantitative landing correction to be performed correctly in a short time.
REFERENCES:
patent: 3588583 (1971-06-01), Ciecierski
patent: 4963789 (1990-10-01), Buhler
patent: 5066891 (1991-11-01), Harrold et al.
patent: 5117155 (1992-05-01), Buhler
patent: 5168199 (1992-12-01), Huffman et al.
English Abstract of Document No. 2-29187 as shown above.
English Abstract of Document No. 52-40921 as shown above.
Inoue Ikunori
Kida Kazushige
Tsujihara Susumu
Blum Theodore M.
Matsushita Electric - Industrial Co., Ltd.
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