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This slanted elliptical springs is often used for the mechanical joints, because of its simple  and small struture can satisfy the tiny divice's need. 

Each of its coils can be individually deformed, so the entire spring will reaction no matter which partof the spring is compressed.  the load on each contact point is guaranteed to be consistent.

this achieves a dural function in micro-connector,  one is guarantee the stess requriements of inserting or extraction and second  minimizing RF interference.