A novel conducting structure and conducting method for an upper sheet and a lower sheet of a film button circuit. A first upper sheet conducting layer and a second upper sheet conducting layer are coated in sequence on an upper sheet conducting contact point. A first lower sheet conducting layer and a second lower sheet conducting layer are coated in sequence on a lower sheet conducting contact point. The first upper sheet conducting layer, the second upper sheet conducting layer, the second lower sheet conducting layer and the first lower sheet conducting layer are overlapped in sequence, thereby forming a composite conducting layer that is slightly greater than a back glue layer in thickness. The present invention can simplify assembly processes and can improve the production efficiency.

A keyboard device includes a base plate, a key and a membrane circuit board. The key is connected with the base plate. The membrane circuit board is arranged between the key and the base plate. The base plate includes a connecting structure. The connecting structure is protruded upwardly and penetrated through the membrane circuit board. The key includes a keycap and a stabilizer bar. The stabilizer bar is pivotally coupled to the keycap. A hook part of the stabilizer bar is penetrated through a corresponding locking hole of the connecting structure. A film layer of the membrane circuit board includes an extension part. A gel layer is formed on the extension part. While the keycap is moved upwardly or downwardly relative to the base plate, the hook part of the stabilizer bar is moved on the gel layer.

A switch includes a case, fixed electrodes, a movable electrode and a pressing member. The fixed electrodes and the movable electrode are arranged inside the recess. The pressing member is arranged so as to cover at least a part of the recess, and displaces the movable electrode from the second position to the first position by a pressing force from the outside. The pressing member includes a first bent part and a second bent part, and a deforming part disposed therebetween. The deforming part is opposed to the movable electrode with a gap in a state where the movable electrode is in the second position. The deforming part is configured to be flexibly deformed toward the outside of the case in a state where the movable electrode is in the first position in which the fixed electrodes are in a conductive state.

A switch assembly includes a switch body defining a switch opening, a dome switch positioned in the switch opening, a film attached to a surface of the switch body and covering the switch opening, and a protrusion extending from the film in an area above the switch opening. The protrusion is configured to transfer a force from a keycap of a key to the dome switch when the keycap is depressed. The dome switch may include an upper dome below the film and a lower dome below the upper dome.

A switch assembly includes a switch body defining a switch opening, a dome switch positioned in the switch opening, a film attached to a surface of the switch body and covering the switch opening, and a protrusion extending from the film in an area above the switch opening. The protrusion is configured to transfer a force from a keycap of a key to the dome switch when the keycap is depressed. The dome switch may include an upper dome below the film and a lower dome below the upper dome.