Abstract: In an embodiment, a membrane switch may include a flexible light guide having a first refractive index. The flexible light guide may include a first wall, an opposing second wall, and one or more additional walls. One or more of the first wall, the second wall and the additional walls may be disposed adjacent to a substance including a second refractive index that is lower than the first refractive index.

Abstract: A switch has multiple movable contacts, such as snap domes, positioned in a stacked relationship with each other. The stacked relationship may be such that the apexes of each dome point in the same orientation, or the apexes may be in an opposite orientation so that they point toward or away from each other. When the switch is initially depressed, one of the contacts forms a first electrical connection. When the switch is further depressed, a second one of the contacts forms a second electrical connection. Alternatively, multiple moveable contacts are positioned on the same plane under a single bubble of a carrier sheet. Multiple actuating elements may depress each of the domes. Adjacent domes may share common conductive traces.

Abstract: A moveable contact body that includes a carrier sheet, a moveable contact, and an adhesive layer on at least a portion of a lower surface of the carrier sheet and an upper surface of the moveable contact. The adhesive layer may be water soluble or viscoelastic. A viscoelastic material may be positioned on an upper surface of the carrier film. At least a periphery of the moveable contact may be a rolled foot. Another embodiment may be a membrane switch including a carrier sheet, a moveable contact and an electrical contact having a central stationary damping conductive pill.

Abstract: In an embodiment, a membrane switch may include a flexible light guide having a first refractive index. The flexible light guide may include a first wall, an opposing second wall, and one or more additional walls. One or more of the first wall, the second wall and the additional walls may be disposed adjacent to a substance including a second refractive index that is lower than the first refractive index.