Electric lamp and discharge devices – Cathode ray tube – Envelope
Patent
1993-07-20
1996-06-25
Yusko, Donald J.
Electric lamp and discharge devices
Cathode ray tube
Envelope
313402, 313407, H01J 2907
Patent
active
055303161
ABSTRACT:
Provided is a color cathode-ray tube with a magnetic shield member which is capable of efficiently reducing only the amount of mislanding caused by the external magnetic field applied in one direction by effectively utilizing the shape effect of a magnetic substance and which can be readily designed. A U-shaped magnetic substance is formed by curving an elongated magnetic substance into a U-like shape. One end of the U-shaped magnetic substance is fixed to a long side wall side of a frame, while the other end thereof extends toward an electron gun. The U-shaped magnetic substance is magnetized therealong due to the shape effect thereof, concentrating an induction field on the area surrounded by the U-shaped magnetic substance. Thus, a great shield effect can be obtained. Further, the U-shaped magnetic substance is readily magnetized in a special direction due to its shape anisotropy. Thus, influence of an external magnetic field applied in the special direction can be effectively eliminated, and design is facilitated. Also, production cost can be reduced, and the performance can be improved.
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Haga Akira
Nasuno Hiroshi
Yamane Keisuke
Mitsubishi Denki & Kabushiki Kaisha
Richardson Lawrence O.
Tohoku Gakuin University
Yusko Donald J.
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