The clip’s conductive material connects to a capacitive sensor located within the pen-based peripheral. Meanwhile, the clip’s exterior material is the exact opposite: It’s thicker at the tip end and grows thinner as it stretches up toward the clip’s physical attachment to the pen itself.
Microsoft’s patent shows the conductive material is at its thickness toward the top of the clip and grows thinner as it stretches down near the tip area. This outer shell could consist of plastic, paint, or some other “electrically isolating” coating. It consists of an interior conductive material that has a greater electrical conductivity than the clip’s exterior isolating material. In one design example, the touch-sensitive retention clip extends between the tip end and the eraser end and connects to the pen toward the eraser side.
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