| 摘要 |
PURPOSE:To prevent the erroneous operation due to the electromagnetic field from the outside, by forming a cabinet which houses balance parts including the load cells and an A/D converter circuit by upper and lower cases, and connecting a conductive layer provided on the inner surface of the cabinet by the peripheral part of the case. CONSTITUTION:The cabinet 16, which houses the balance parts including the load cell to which a receiving pan frame is attached and the A/D converter circuit, is formed by the lower case 17 made of a die cast product and the upper case made of plastic product. The upper case 18 is fixed to four supporting posts 19 provided on the lower case 17 at boss parts 28 by screws 31. The contact pieces 21 comprising an elastic material are attached to both sides of the periphery 20 of the lower case 17, and contacted with the conductive layer 29, which is applied on the inner surface of the upper case 18 other than the boss parts 28. Therefore, the inner space of the cabinet 16 is completely shielded, and the conductive layer 29 are not contacted with the supporting posts 19. Thus the erroneous operation due to the electromagnetic energy from the outside can be prevented. |
