| 摘要 |
PROBLEM TO BE SOLVED: To provide a shield method which does not degrade a shield effect due to a secular change and can hold the shield effect over a long period. SOLUTION: A printed board 21 is interposed and screwed between a lower shield case 12 of a flat plate shape and an upper shield case 13 of a box shape. The upper shield case 13 is provided with a diaphram 15 at a center of a lower opening to divide it into A and B blocks 16a, 16b. The printed board 21 comprises printing conductors 22a, 22b of a grounding potential on the upper face and lower face thereof, the printing conductor 22a of the upper face is provided at an opening end of the upper shield case 13 and at the corresponding location of the diaphram 15, and first and second high-frequency circuits are constituted on the upper face. EMI gaskets 35a to 35c for shielding are provided adjacent to the diaphram 15 on the printed board 21. When the upper shield case 13 is screwed to the lower shield case 12, they are pressure-welded to the printing conductor 22a on the printed board 21 for shielding. COPYRIGHT: (C)2008,JPO&INPIT |
