U字形磁性体を配設したCRTの電子ビーム軌道の検討

抄録

This paper proposes a new method for shielding an ambient magnetic field in CRTs. The key to this method is the use of U-shaped magnetic sheets arranged around the frames of the CRTs. The sheets are magnetized by the ambient field, and set up a demagnetizing field to cancel the field perpendicular to the screen. They are effective in reducing miss-landing. For example, miss-landings at the corner of the screen were reduced to one-fourth of the number that occurred without the sheets. On the other hand, there are no shielding effects on the field parallel to the screen.