| 摘要 |
PROBLEM TO BE SOLVED: To suppress a high frequency radiation noise radiated to space from a noise source to be radiated through a through-hole of a partitioning plate to a room of the side where a filter portion is arranged, thereby preventing the deterioration of filter effect of the filter portion, and at the same time, to eliminate electromagnetic disturbance to an external equipment by preventing radiation to outside from an outer wall through-hole. SOLUTION: The high frequency shielding case is made of metal, having a case-like shape in which an entrance and exit of a wiring is provided in an outer wall, the interior of the case is divided by a partitioning plate 46 having the through-hole, a noise source 20 which generates the high frequency radiation noise is arrangingly provided in one of the divided room. In this configuration, in the circumferencial surface of the through-hole 45 of the partitioning plate 46, a plurality of recessed grooves 47a, 47b is formed at a predetermined interval along the circumferencial surface while crossing the penetrating direction of the through-hole 45, a plurality of protruding portions 48a-48c is provided protruding in the state of facing each other between these adjacent recessed grooves 47a, 47b as well as in both sides. COPYRIGHT: (C)2011,JPO&INPIT
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