| 摘要 |
A DEVICE FOR CORRECTION OF NEGATIVE DIFFERENTIAL COMA ERROR IN CONVERGENCE FREE DEFLECTION YOKES (20). THE DEFLECTION YOKE (20) ENCLOSES A PORTION OF A CATHODE RAY TUBE, INCLUDING A PORTION OF THE CATHODE RAY TUBE NECK, AND INCLUDES: A SEPARATOR AROUND WHICH IS WOUND A HORIZONTAL DEFLECTION COIL (30) FOR PROVIDING A HORIZONTAL MAGNETIC DEFLECTION FIELD; A CORE AROUND WHICH IS WOUND A VERTICAL DEFLECTION COIL (25) FOR PROVIDING A VERTICAL MAGNETIC DEFLECTION FIELD, THE CORE PARTIALLY ENCIRCLING THE SEPARATOR; AND A REAR COVER (35) WHICH ATTACHES THE DEFLECTION YOKE (20) TO THE CATHODE RAY TUBE, THE REAR COVER (35) BEING DISPOSED AROUND THE NECK OF THE CATHODE RAY TUBE AND HAVING A FIRST SIDE FACING THE DIRECTION OF THE SCREEN OF THE CATHODE RAY TUBE AND RESTING AGAINST A REAR END OF THE SEPARATOR. IN ACCORDANCE WITH THE PRESENT INVENTION, ARCUATE SHUNTS (100), WHICH ARE PREFERABLY "C"-SHAPED AND HAVE INSIDE RADII WHICH ARE PARALLEL TO THE NECK OF THE CATHODE RAY TUBE, ARE DISPOSED ON THE FIRST SIDE OF THE REAR COVER (35), AND ARE PREFERABLY CENTERED ON A FIRST AXIS OF THE NECK OF THE CATHODE RAY TUBE, SUCH AXIS BEING PARALLEL TO AN AXIS OF THE SCREEN OF THE CATHODE RAY TUBE. THE USE OF THESE "C"-SHAPED SHUNTS (100) IS FOUND TO CORRECT THE NEGATIVE DIFFERENTIAL COMA ERROR INTRODUCED BY THE CONVERGENCE FREE DEFLECTION YOKE (20).
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