Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1985-10-25
1988-04-12
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
047376929
ABSTRACT:
A deflection yoke unit to be mounted on a cathode ray tube has a core on which a set of vertical deflection coils and a set of horizontal deflection coils are wound. A pincushion distortion correction device is provided for the deflection yoke unit. The correction device has a set of correction coils having a coil conductor mass quantity and an inductance which are smaller than those of the vertical deflection coil set and having a winding density distribution which is similar to that of the vertical deflection coil set. An upper and lower pincushion distortion correction current is passed through the correction coil set to correct upper and lower pincushion distortions in pictures displayed on a screen of the cathode ray tube. The core has, on its inner wall, slots in which windings of the horizontal deflection coil set, vertical deflection coil set and correction coil set for correction of the upper and lower pincushion picture distortions are received. A plurality of winding guide claw members having each two or three slots are attached to a front open end and a rear open end of the core, respectively. Front end conductors of the respective coil sets are separately placed in the slots at the front open end of the core and rear end conductors of the respective coil sets are separately placed in the slots at the rear open end of the core.
REFERENCES:
patent: 3440482 (1969-04-01), Lister et al.
patent: 3735193 (1973-05-01), Ikeuchi
patent: 3760222 (1973-09-01), Smith
patent: 3916254 (1975-10-01), Worster et al.
patent: 3983450 (1976-09-01), Lehnert
patent: 4318035 (1982-03-01), Fitzgerald
patent: 4636693 (1987-01-01), Saruta
Ando Kunio
Maekawa Hitoshi
Obara Masao
Okuyama Nobutaka
Ooguro Hiroki
Blum Theodore M.
Cain David
Hitachi , Ltd.
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