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Josef C Frisch, Gregory E Leyh, John C Platt, Timothy P Allen, Richard R Schediwy, Federico Faggin: Force sensing touchpad. Synaptics Incorporated, D Alessandro & Ritchie, December 29, 1998: US05854625 (303 worldwide citation)

A force sensing touchpad comprises a substantially rigid touch surface; a substantially rigid frame; a plurality of spring structures formed integrally with the touch surface and mechanically connected to the reference frame; and a circuit for deriving force information from capacitances proportiona ...


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Josef C Frisch, Gregory E Leyh, John C Platt: Force sensing touchpad. Synaptics, zhang zhicheng, September 23, 1998: CN97126478

A force sensing touchpad comprises a substantially rigid touch surface; a substantially rigid frame; a plurality of spring structures formed integrally with the touch surface and mechanically connected to the reference frame; and a circuit for deriving force information from capacitances proportiona ...


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