Recently, cathode ray tubes (CRTs) have become flat and larger, and the magnetic shielding against the terrestrial magnetic field is becoming more important for CRTs to improve the image quality. As CRTs of TV sets and computer monitors are used after the degaussing process, it is necessary to consider the magnetic shielding effect in terms of the anhysteretic permeability. In this paper, dependence of anhysteretic permeability on the chemical composition and the microstructure of steel sheets for inner magnetic shields has been studied. In addition, the importance of anhysteretic permeability on magnetic shielding has been experimentally investigated.
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