Convergence yoke for improving focus characteristics

Details Convergence yoke for improving focus characteristics Convergence yoke for improving focus characteristics

1994-03-14

1998-02-17

Gellner, Michael L.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Electron or ion beam deflecting type

313440, H01J 2770, H01J 2976

Patent

active

057195420

ABSTRACT:
The present invention discloses a convergence yoke for improving focus characteristic. It comprises vertical correcting coils and horizontal correcting coils coils connected to a vertical deflection signal line and producing a barrel-shaped deflection field more enfeebled in magnetic shape without the change of magnetic force or equalizing a correction field without the change of magnetic force to improve focus characteristic of electron beams; and a core for making the vertical correcting coils and horizontal correcting coils produce an enfeebled barrel-shaped deflection field. Besides, this invention corrects coma aberration by compensating the barrel-shaped deflection field and the pincushion-shaped deflection field with each other to equalize the deflection fields without the change of magnetic force.

REFERENCES:
patent: 4961021 (1990-10-01), Oguro et al.

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