| 摘要 |
PROBLEM TO BE SOLVED: To enhance the frequency resolution and cutting quality by adding a material having desired variable amount to a sensing element or removing the material therefrom at a selected point on the neutral axis of sensing element thereby shifting or matching the oscillation mode frequency. SOLUTION: The recessed edge 6 is subjected to compressive stress while the projecting edge 7 is subjected to tensile stress. Transition is made from tensile stress to compressive stress across the cross-section of an element 1 and a plane of stress 0, i.e., a neutral axis 5, is present at the transition part. When a material is removed to the ring structure of element 1 or added thereto in the vicinity of axis 5 or at least one point along the axis 5, it has no effect on the rigidity of element 1 but the mass thereof is varied. Consequently, when the material is added to the ring structure or removed therefrom, resonance frequency is increased. When the stress-free region around the axis 5 is coated with the material, adverse effect on the rigidity can be eliminated. When the material 4 is added, balancing can be repeated at same point by same method. |
