Title:
偏向システム
Document Type and Number:
Japanese Patent JP3989681
Kind Code:
B2
Abstract:
An electron beam tends to slope downwardly as it is deflected horizontally to form a raster in a video display apparatus. The sloping of the beam can cause geometric errors in the raster, for example orthogonality and parallelogram errors. A raster correction circuit substantially offsets the downward slop of the electron beam by modulating a vertical deflection current (IV) with an induced horizontal-rate raster correction current, thereby substantially eliminating orthogonality and parallelogram errors in the raster. A raster correction transformer (41) utilizes a raster centering inductor (LC) for a primary winding, and a horizontal-rate centering current (IC) is magnetically coupled into the vertical deflection coils (LV1, LV2) to modulate the vertical deflection current.
Inventors:
Turscalo, Walter
Fernsler, Ronald Eugene
Fernsler, Ronald Eugene
Application Number:
JP2000516479A
Publication Date:
October 10, 2007
Filing Date:
October 10, 1997
Export Citation:
Assignee:
Thomson Licensing
International Classes:
H04N3/23; G09G1/12; H04N3/227; H04N3/233
Domestic Patent References:
| JP10075381A | ||||
| JP9261506A | ||||
| JP2113776A | ||||
| JP62268272A |
Attorney, Agent or Firm:
Tadahiko Ito