| 摘要 |
1. A device for the protection of cathode ray tubes with a mask and with a shielding screen of a material with a low magnetic permeability, with respect to the terrestrial magnetic field, comprising a demagnetizing coil of the type with two loops (10 and 11) of oblong form, whose major sides (12, 13, 16 and 17) are placed substantially horizontally, said two loops being secured to a substantial extent on the cone (3) of the cathode ray tube, symmetrically with respect to a plane passing along the axis of the neck (4) of the tube and connected by a device generating a demagnetizing current, characterized in that the two major sides of these loops furthest removed from each other (16 and 17) are located to the fore of the sintering plane (5) of the tube.
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