| 摘要 |
PROBLEM TO BE SOLVED: To maintain stiffness of a cabinet 1, without breaking internal electronic components, etc., by a rib provided inside the cabinet 1 for housing the electronic components and a printed wiring board 2. SOLUTION: There is provided a rib 4, on the inner wall face of a cabinet 1, which has a prescribed length, and in which the height from the inner wall face of the cabinet 1 towards a substrate 2 is highest at a position counter to a boss 3 for supporting the substrate 2, and as the rib 4 separates from the position counter to the boss 3, it is formed continuously low. When a shock is given to an X position relevant to the position where the height is formed highest, the shock is fully supported by the rib 4 and the boss 3. Furthermore, an impact force when the shock is given added to a Y position separated at a prescribed distance from the X position is transmitted from the rib 4 from the rib 4 near the Y position which is lower in height towards the rib 4 of the X position which is high in height, while being dispersed.
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