Importance

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Abstract

A pen-down sense switch for electronic styli is based on three geometric principles. The first is that a regular convex surface contacts any other surface possessing a larger (or a relative negative) radius of curvature at a single point. The second principle is that rigid bodies may be translated (within limits) without changing their size or shape. The third is that given a plane with a constant radius of curvature, three points which can contact its surface will uniquely determine its position. Within the physical environment and subject to the forces which typically act on stylus switches, machined, solid metal components can be made to be a better than first-order approximation to ideal geometric objects.

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First Claim