| 摘要 |
PURPOSE:To inhibit the variation of inductance by providing a non-magnetic metal on a part or whole the periphery of the inner face of a magnetic case for shielding an inductance element. CONSTITUTION:The circuit part of an inductance element 2 attached to a printed-circuit board 3 is shielded with a case 1 of a magnetic material. A non-magnetic metal foil 4 is adhered on such a portion on the inner face of the case 1 that it interferes with the magnetic flux of the element 2. The foil of non-magnetic material 4 with less eddy current loss interferes with the magnetic flux of the element 2, so that the loss of the element is reduced to inhibit Q from lowering. This constitution enables the element 2 after adjustment to be brought close to the case 1 without causing any tuning deviation. |
