An elastomeric keypad (1) is shown having at least one key (3) having an elastomeric dome (41) defining a chamber (42) and provided inside with an activating means (43), an activation means (44) cooperating with the activating means (43), and at least one compensating channel (48) opening at the chamber (42) to enable for a flow of fluid from the chamber (42), while the elastomeric dome (41) collapses, and to the chamber (42), while the elastomeric dome (41) releases. In order to suppress the sound intensity of the push up event, at least one of the compensating channels (48) includes at least one valve arrangement (5) generating fluid restrictions while the fluid returns to the chamber (42). Preferably the valve arrangement (5) has a form of a Tesla Valve.

The present invention relates to an elastomeric keypad (1) having at least one key (3) comprising an elastomeric dome (41) defining a chamber (42) and provided inside with an activating means (43), an activation means (44) cooperating with said activation means (44), and at least one compensating channel (48) opening at said chamber (42) to enable for a flow of fluid from said chamber (42), while said elastomeric dome (41) collapses, and to said chamber (42), while said elastomeric dome (41) releases. In order to suppress the sound intensity of the pushup event, at least one of said compensating channels (48) comprises at least one valve arrangement (5) generating fluid restrictions while the fluid returns to said chamber (42). Preferably said valve arrangement (5) has a form of a Tesla Valve.

A keyboard device includes plural key structures, a switch circuit board, an elastic cover and a seal element. The switch circuit board includes a hollow region. The elastic cover is disposed on the switch circuit board. The hollow region is covered by the elastic cover, so that a foreign liquid is prevented from entering the switch circuit board. The seal element is disposed on sidewalls of the switch circuit board. Consequently, a sealed region is formed between the switch circuit board and the elastic cover. When the inner gas within the switch circuit board is changed, the elastic cover is subjected to expansion or contraction. Consequently, the switch circuit board is not subjected to deformation in response to the volume change of the inner gas.

A keyboard device includes plural key structures, a switch circuit board, an elastic cover and a seal element. The switch circuit board includes a hollow region. The elastic cover is disposed on the switch circuit board. The hollow region is covered by the elastic cover, so that a foreign liquid is prevented from entering the switch circuit board. The seal element is disposed on sidewalls of the switch circuit board. Consequently, a sealed region is formed between the switch circuit board and the elastic cover. When the inner gas within the switch circuit board is changed, the elastic cover is subjected to expansion or contraction. Consequently, the switch circuit board is not subjected to deformation in response to the volume change of the inner gas.

A keyboard module and an electronic device using the keyboard module are provided. The keyboard module includes a housing, a plurality of keys, a micro pump chamber and an actuator. The housing has multiple openings with the keys disposed in the housing. Each key includes a switch membrane, a key cover, an elastic element and a scissor unit. The switch membrane has a key switch, the key cover is above the switch membrane, and the elastic element disposed between the switch membrane and the key cover triggers the key switch when being pressed and deformed. The scissor unit is disposed between the key cover and the switch membrane to support the key cover. The micro pump chamber disposed below the key cover includes a first chamber, a second chamber communicating with the first chamber, a check valve disposed between the first chamber and the second chamber, and an actuator driving the keys to be withdrawn into or protrude out of the openings.

A keyboard module and an electronic device using the keyboard module are provided. The keyboard module includes a housing, a plurality of keys, a micro pump chamber and an actuator. The housing has multiple openings with the keys disposed in the housing. Each key includes a switch membrane, a key cover, an elastic element and a scissor unit. The switch membrane has a key switch, the key cover is above the switch membrane, and the elastic element disposed between the switch membrane and the key cover triggers the key switch when being pressed and deformed. The scissor unit is disposed between the key cover and the switch membrane to support the key cover. The micro pump chamber disposed below the key cover includes a first chamber, a second chamber communicating with the first chamber, a check valve disposed between the first chamber and the second chamber, and an actuator driving the keys to be withdrawn into or protrude out of the openings.