A Three-dimensional Magnetic Field Mapping System for Deflection Yoke of Cathode-Ray Tube

  • Park, K.H. (Pohang Accelerator Laboratory, POSTECH) ;
  • Yoon, M. (Pohang Accelerator Laboratory, POSTECH) ;
  • Lee, S.M. (Device Research Laboratory, LG.Philips Displays Co., Ltd) ;
  • Joo, H.D. (Device Research Laboratory, LG.Philips Displays Co., Ltd) ;
  • Lee, S.D. (Device Research Laboratory, LG.Philips Displays Co., Ltd) ;
  • Yang, W.Y. (Device Research Laboratory, LG.Philips Displays Co., Ltd)
  • Published : 2002.08.21

Abstract

In this paper, we introduce an efficient three-dimensional magnetic field mapping system for a Deflection Yoke (DY) in Cathode-Ray Tube (CRT). A three-axis Hall probe mounted in a small cylindrical bar and three stepping motors placed in a nonmagnetic frame are utilized for the mapping. Prior to the mapping starts, the inner contour of DY is measured by a laser sensor to make a look-up table for inner shape of DY. Three-axis magnetic fields are then digitized by a three-dimensional Hall probe. The results of the mapping can be transformed to various output formats such as multipole harmonics of magnetic fields. Field shape in one, two and three-dimensional spaces can also be displayed. In this paper, we present the features of this mapping device and show some analysis results.

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