| 摘要 |
A card-shaped electronic apparatus includes a base in the form of a substantially rectangular plate having a natural bending vibration mode, components mounted on the base, and covers attached to the base and covering the components. The base has a pair of side edge portions capable of being guided along a pair of guide rails of a card slot. Protrusions for determining the position where the base contacts the guide rails are located individually near positions corresponding to nodes of the bending vibration mode on each side edge portion, and project in the thickness direction of the base.
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