US Patent 7164089 Thin keyboard structure

A thin keyboard structure comprises a substrate, a flexible circuit and a keycap. The substrate comprises a base, a first portion with a first end, and a second portion with a second end. At least one of the first portion and the second portion protrudes from the base at an included angle. The first end is aligned with the second end and separated from the second end by some distance. The flexible circuit comprises a first contact fixed on the first end and a second contact fixed on the second end. The keycap having at least one connecting device is fixed on the portion that protrudes from the base.