Deflection device for projection tube and projection tube apparatus
AssigneeMatsushita Toshiba Picture Display Co., Ltd.
InventorTakahiko Yoshinaga
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Abstract
A deflection device for a projection tube includes a main deflection device for generating a raster and an auxiliary deflection device for correcting a convergence. The auxiliary deflection device includes a toroidal auxiliary horizontal coil, a saddle-type auxiliary vertical coil, and a ferrite core. According to this configuration, the deflection efficiency is enhanced, and pincushion distortion in upper and lower portions can be corrected efficiently while a change in the shape of a beam spot is reduced.
Claims7
A deflection device for a projection tube, comprising a main deflection device for generating a raster and an auxiliary deflection device for correcting a convergence,
- wherein the auxiliary deflection device includes an auxiliary horizontal coil, an auxiliary vertical coil, and a ferrite core on which the auxiliary horizontal coil and the auxiliary vertical coil are wound,
- the auxiliary horizontal coil is a toroidal coil, and the auxiliary vertical coil is a saddle-type coil, and
- the ferrite core is provided separately from a main core of the main deflection device.
Dependencies are inferred from the claim text.