Abstract: A keypad overlay membrane provides guidance to a user in selecting an intended key to strike and avoiding striking unintended keys. In one arrangement the overlay membrane is formed by a continuous thin-walled sheet having an outwardly-facing surface and an opposed inwardly-facing surface. Formed into the thin-walled sheet are a first array of raised members and a second array of channels. The raised member array is laid out in a configuration for positioning atop individual keys of the electronic device keypad, with the channel array located between the raised member array. Upon placing the overlay membrane onto keypad, the user can apply a sufficient inwardly directed force to one of the raised members to induce movement of the respective key underlying and aligned with the particular raised member. In another arrangement, an array of concave depressions substitutes for the raised member array and channel array.

Abstract: A keypad overlay membrane provides guidance to a user in selecting an intended key to strike and avoiding striking unintended keys. In one arrangement the overlay membrane is formed by a continuous thin-walled sheet having an outwardly-facing surface and an opposed inwardly-facing surface. Formed into the thin-walled sheet are a first array of raised members and a second array of channels. The raised member array is laid out in a configuration for positioning atop individual keys of the electronic device keypad, with the channel array located between the raised member array. Upon placing the overlay membrane onto keypad, the user can apply a sufficient inwardly directed force to one of the raised members to induce movement of the respective key underlying and aligned with the particular raised member. In another arrangement, an array of concave depressions substitutes for the raised member array and channel array.