| 摘要 |
A circular ring stack apparatus for preventing EMI(Electromagnetic Interference) due to cables of electronic equipment is provided to reduce the amount of external radiation of the electromagnetic waves through the cables. A circular ring stack apparatus for preventing EMI due to cables of electronic equipment includes an external structure, a first metal ring(121), a second metal ring(122), a third metal ring(123), a fourth metal ring(124), and a fifth metal ring(125). The external structure includes a hole through which the cable passes. The first metal ring(121) has a predetermined first diameter, has a hole of the same size as the hole of the external structure, and is mounted on the external structure. An external circle of the second metal ring(122) has the first diameter, and an internal circle thereof has a second diameter smaller than the first diameter. The second metal ring(122) is mounted on the first metal ring(121). The third metal ring(123) has the first diameter, has a hole with the same size as the hole of the external structure, and is mounted on the second metal ring(122). An external circle of the fourth metal ring(124) has the first diameter, and an internal circle thereof has a third diameter between the first diameter and the second diameter, and is mounted on the third metal ring(123). The fifth metal ring(125) has the first diameter, has a hole with the same size as the hole of the external structure, and is mounted on the fourth metal ring(124).
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