| 摘要 |
1,109,103. Cathode-ray tube circuits. RADIO CORPORATION OF AMERICA. 21 July, 1965 [31 Aug., 1964], No. 31062/65. Heading H4T. [Also in Division H1] A magnetic shield and demagnetizing arrangement for the screen end of a colour television shadow-mask tube comprises a frusto-conical shield 16, e.g. of sheet steel, closely enveloping the tube 13 and two saddle coils 21, 22, or a corresponding single unitary coil, which may be energized by A.C. initially of high value and rapidly reduced to zero. The coils may be wholly inside or wholly outside the shield 16, or partly within and partly outside the shield channels or cut-outs 23 being provided in the shield for the coil turns. |
