Patent ID: 7077657

Claim:
A contact structure for electrically connecting a spring-loaded connector array and a pad array, the spring-loaded connector array having a plurality of spring-loaded connectors arranged symmetrically with respect to a center axis of the spring-loaded connector array and in parallel with each other and the pad array having a plurality of pads arranged symmetrically with respect to a center axis of the pad array so as to be aligned with the plurality of spring-loaded connectors in a plurality of orientations relative to the spring-loaded connector array, wherein: a tip of a first connector of the plurality of spring-loaded connectors has an initial position that is axially offset from an initial position of a tip of a second connector of the plurality of spring-loaded connectors; a firs pad of the plurality of pads that is arranged to come in contact with the first connector is axially offset from a second pad of the plurality of spring-loaded pads; and the first connector, the second connector, the first pad, and the second pad are arranged so that in only one of the plurality of orientations will all of the plurality of connectors come in contact with a corresponding adjacent pad selected from the plurality of pads.