Membrane Key Switch Spacer Prevents False Triggering

The patent introduces a spacer structure as an intermediary element positioned between the membrane circuit board and the bottom plate. This spacer creates a controlled gap that prevents foreign objects from reaching the membrane layers while maintaining compact overall dimensions. The spacer acts as a protective mediator that resolves the contradiction between compactness and reliability.

The patent addresses the thickness issue by introducing a spatial dimension through the spacer structure. Rather than simply increasing the vertical distance between membrane and bottom plate, the spacer is positioned at specific locations (peripheral edges of trigger zones) to create localized separation. This dimensional approach allows compact overall design while providing protection where needed.

The spacer structure is not uniformly distributed but is strategically positioned at the peripheral edges of trigger zones where foreign objects are most likely to cause false triggering. This localized approach provides maximum protection with minimum added complexity, as spacers are only placed where they are functionally necessary rather than across the entire membrane surface.

The patent employs a partial action approach by using spacers only at critical locations (peripheral edges) rather than providing continuous separation across the entire membrane circuit board. This partial protection is sufficient to prevent foreign objects from deforming the membrane layers while minimizing the number of components added to the system.