A keyswitch device includes a base plate, a membrane circuit board, a light source, and a keyswitch assembly. The membrane circuit board is disposed on the base plate and includes a reflective film layer, a transmissive film layer, and a light guide spacer. The reflective film layer is located on the base plate. The transmissive film layer is located over the reflective film layer. The light guide spacer has an accommodating space. The reflective film layer and the transmissive film layer are respectively located at opposite sides of the light guide spacer. The light source is disposed between the reflective film layer and the transmissive film layer and located in the accommodating space. The keyswitch assembly is disposed on the membrane circuit board.

The switch body includes: a wiring substrate where first to fourth fixed contact members are formed; and a movable contact member including a pressure receiving part opposite from the second fixed contact member, a first outer edge facing the first fixed contact member, and a second outer edge facing the third fixed contact member. The fourth fixed contact member is formed in a region outside a projection region being a projection of the movable contact member on the wiring substrate and is in a position facing the first outer edge when the second outer edge is moved to a region where the second fixed contact member is formed.

The switch body includes: a wiring substrate where first to fourth fixed contact members are formed; and a movable contact member including a pressure receiving part opposite from the second fixed contact member, a first outer edge facing the first fixed contact member, and a second outer edge facing the third fixed contact member. The fourth fixed contact member is formed in a region outside a projection region being a projection of the movable contact member on the wiring substrate and is in a position facing the first outer edge when the second outer edge is moved to a region where the second fixed contact member is formed.

A keyswitch device includes a base plate, a membrane circuit board, a light source, and a keyswitch assembly. The membrane circuit board is disposed on the base plate and includes a reflective film layer, a transmissive film layer, and a light guide spacer. The reflective film layer is located on the base plate. The transmissive film layer is located over the reflective film layer. The light guide spacer has an accommodating space. The reflective film layer and the transmissive film layer are respectively located at opposite sides of the light guide spacer. The light source is disposed between the reflective film layer and the transmissive film layer and located in the accommodating space. The keyswitch assembly is disposed on the membrane circuit board.

Example implementations relate to thermally fused spacers. In one example, keyboard membranes including thermally fused spacers include a first circuit including a first conductive trace and a first key contact of the keyboard membrane, where the first conductive trace is coupled to the first key contact, a second circuit including a second conductive trace and a second key contact of the keyboard membrane, where the second conductive trace is coupled to the second key contact, and wherein the second key contact is to couple to the first key contact, and a spacer formed of a layer of thermoplastic material, a first thermoplastic film, and a second thermoplastic film, where the spacer is fused via the first thermoplastic film to the first circuit and via the second thermoplastic film to the second circuit.

A slide-in clamping device for removably connecting a first electrical terminal of a withdrawable low-voltage circuit breaker to a corresponding second electrical terminal of a respective stationary base in a withdrawable low-voltage circuit breaker unit includes at least one pair of first clamping fingers facing each other and at least partially laterally delimiting a first clamping seat for one of said first and second electrical terminals; at least one pair of second clamping fingers facing each other and at least partially laterally delimiting a second clamping seat for the other of said first and second electrical terminals; and bias elastic mechanism acting on said at least one pair of first clamping fingers and said at least one pair of second clamping fingers.

Example implementations relate to thermally fused spacers. In one example, keyboard membranes including thermally fused spacers include a first circuit including a first conductive trace and a first key contact of the keyboard membrane, where the first conductive trace is coupled to the first key contact, a second circuit including a second conductive trace and a second key contact of the keyboard membrane, where the second conductive trace is coupled to the second key contact, and wherein the second key contact is to couple to the first key contact, and a spacer formed of a layer of thermoplastic material, a first thermoplastic film, and a second thermoplastic film, where the spacer is fused via the first thermoplastic film to the first circuit and via the second thermoplastic film to the second circuit.

A keyboard includes plural keys, a membrane key switch module and plural diodes. The plural diodes are disposed on the membrane key switch module, and electrically connected with plural upper contacts or plural lower contacts of the membrane key switch module. Consequently, the keyboard has the function of avoiding the ghosting problem.

A keyboard includes plural keys, a membrane key switch module and plural diodes. The plural diodes are disposed on the membrane key switch module, and electrically connected with plural upper contacts or plural lower contacts of the membrane key switch module. Consequently, the keyboard has the function of avoiding the ghosting problem.