Inductive interconnection system

An inductive interconnection system, comprising:

• a transmitting element comprising:
• a transmitting ferromagnetic structure having a transmitting groove region defining two transmitting end regions disposed on opposing sides of the transmitting groove region;
• and
• a transmitting inductor coil wound about the transmitting groove region of the transmitting ferromagnetic structure and in between the two transmitting end regions, the transmitting inductor coil configured to generate time-varying magnetic flux through the transmitting ferromagnetic structure;
• and
• a receiving element, comprising:
• a ferromagnetic structure having a groove region defining two end regions on opposing sides of the groove region, each end region comprising respective interface surfaces, wherein the groove region has a smaller length than the two end regions;
• an inductor coil wound about the groove region of the ferromagnetic structure and in between the two end regions;
• a shield comprising a plurality of sidewalls and a back wall that form a cavity within which the ferromagnetic structure and inductor coil are positioned;
• and
• a spacer positioned between the ferromagnetic structure and the shield to attach the ferromagnetic structure to the shield.

A stylus for inputting data into a host device, the stylus comprising:

• a housing comprising a curved portion and a flat portion;
• power receiving circuitry disposed within the housing;
• a receiving element disposed within the housing and coupled to the power receiving circuitry, the receiving element comprising:
• a ferromagnetic structure having a groove region defining two end regions on opposing sides of the groove region, each end region comprising respective interface surfaces, wherein the groove region has a smaller length than the two end regions;
• an inductor coil wound about the groove region of the ferromagnetic structure and in between the two end regions, wherein the length of the groove region is a dimension that extends along a direction perpendicular to the axis of the inductor coil;
• a shield comprising a plurality of sidewalls and a back wall that form a cavity within which the ferromagnetic structure and inductor coil are positioned;
• and
• a spacer positioned between the ferromagnetic structure and the shield to attach the ferromagnetic structure to the shield;
• and
• an operating system coupled to the power receiving circuitry and the receiving element, and configured to operate the power receiving circuitry and the receiving element to receive power from the host device.