Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1982-08-24
1985-09-10
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
045409188
ABSTRACT:
The invention provides a coil device having horizontal and vertical deflection coils around an outer surface of an image pickup tube to generate magnetic fields for deflecting electron beams in the horizontal and vertical directions, respectively. A correction coil is disposed between the outer surface of the image pickup tube and the horizontal deflection coil so as to correspond to the position of the vertical deflection coil. The number of turns of the correction coil is smaller than that of the vertical deflection coil. A signal for correcting scanning distortion of the electron beam caused by the deflection magnetic fields is supplied to the correction coil. The time constant of the correction coil is smaller than the period of the horizontal deflection signal. The correction coil is made of a printed circuit wiring.
REFERENCES:
patent: 3307066 (1967-02-01), Shapiro et al.
patent: 3466580 (1969-09-01), Bull
patent: 3743983 (1973-07-01), Holman
patent: 3911321 (1975-10-01), Wardley
patent: 3961219 (1976-06-01), Bechteler et al.
patent: 4191936 (1980-03-01), Colgan, Jr.
patent: 4221992 (1980-09-01), Ueda et al.
patent: 4290038 (1981-09-01), Yamanaka et al.
patent: 4305022 (1981-12-01), Mitamura et al.
E. W. Bull, Printed Scanning Coils, Aug. '68, Wireless World, pp. 260-262.
Kusaka Masataka
Yamanaka Junichi
Blum Theodore M.
Steinberger Brian Scott
Tokyo Shibaura Denki Kabushiki Kaisha
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