An irreversible power switch which is operational from the outside after lamination of laminated communication device and the like, includes a substrate, electrodes disposed on the substrate, a brittle member disposed so as to face the electrodes and apart from the electrodes and a conductive adhesive portion disposed on the brittle member at a side to face the electrodes thereof. The electrodes and the conductive adhesive portion are irreversibly and electrically bonded by brittle fracture of the brittle member under the external pressing force in the thickness direction of the laminated communication device.

An irreversible power switch which is operational from the outside after lamination of laminated communication device and the like, includes a substrate, electrodes disposed on the substrate, a brittle member disposed so as to face the electrodes and apart from the electrodes and a conductive adhesive portion disposed on the brittle member at a side to face the electrodes thereof. The electrodes and the conductive adhesive portion are irreversibly and electrically bonded by brittle fracture of the brittle member under the external pressing force in the thickness direction of the laminated communication device.

A keyboard device includes plural key structures. Each key structure includes a plate assembly, a keycap assembly, an elastic element, a connecting member and a signal generator. The plate assembly includes a membrane switch. The keycap assembly is located over the plate assembly. The elastic element is arranged between the plate assembly and the keycap assembly. The connecting member is arranged between the plate assembly and the keycap assembly. The connecting member includes a triggering part. The signal generator is installed on the plate assembly. While the keycap assembly is moved toward the plate assembly through the connecting member, the triggering part is moved downwardly to trigger the signal generator to generate a first signal. After the signal generator is triggered, the keycap assembly is continuously moved downwardly and the membrane switch is triggered to generate a second signal.

A brush switch with resistors includes a case, a fixed contact point pattern that is fixed to the case, a lever that is supported by the case in an inclinable manner, and a movable contact point brush that is movable by an operation of the lever such that the movable contact point either contacts to or does not contact to the fixed contact point. Wherein the fixed contact point pattern has multiple fixed contact points that are disposed separated from one another in the case, and multiple terminals each of which is connected to the multiple fixed contact points, and the movable contact point brush has multiple contact point spring pieces that separate from or contact with the multiple fixed contact points, respectively, and multiple resistors, which have different resistance values, that are attached to spaces between the multiple contact point spring pieces.

A push-button switch assembly with identification of switching states includes: a push-button switch having an actuating head for actuating the push-button switch and having a push-button guide; and an adapter device for attaching the push-button switch to a housing body. The adapter device fastens the push-button switch in a bore of the housing body. The adapter device compensates for a different diameter of the bore of the housing body and the push-button guide. The push-button guide has a plunger which is arranged in a hollow body of the push-button guide and movable in the hollow body of the push-button guide when the actuating head is actuated. By actuating the actuating head, the push-button switch is switchable from a non-released state to a released state. The push-button switch is arranged such that a region thereof visibly protrudes from under the actuating head when the push-button switch is in the non-released state.

The disclosure provides a keyboard includes a bottom plate, a key unit and a shielding layer. The bottom plate includes a body part and a through hole. The key unit is disposed on the body part. The shielding layer covers a portion of the bottom plate and comprising a main part disposed on the body part and an extension part extending from the main part toward the through hole, wherein the extension part has a hole with a size larger than or substantially equal to a size of the through hole.

The disclosure provides a keyboard includes a bottom plate, a key unit and a shielding layer. The bottom plate includes a body part and a through hole. The key unit is disposed on the body part. The shielding layer covers a portion of the bottom plate and comprising a main part disposed on the body part and an extension part extending from the main part toward the through hole, wherein the extension part has a hole with a size larger than or substantially equal to a size of the through hole.

A key module includes a base plate, a circuit layer and a lifting mechanism. The circuit layer is disposed on the base plate. The lifting mechanism is pivotally connected with the base plate relative to the circuit layer, and the lifting mechanism has an abutment element. The abutment element could interfere with the circuit layer to reduce the noise generated by the key module during operation.

A keyboard case for a tabled computer has a keyboard with a bezel plate having a matrix of apertures therein. A matrix of keycaps corresponds to the matrix of apertures in the bezel plate. The bezel plate has a web between the matrix of apertures comprising narrower lateral web between laterally proximate apertures and wider diagonal web between diagonally proximate apertures. Pockets extend from corners of each aperture into the diagonal web of the bezel plate. Tabs extend from corners of each keycap into corresponding pockets of the bezel plate to interlock the keycaps to the bezel plate.

A keyswitch structure includes a base plate, a keycap, and two supports connected to the base plate and the keycap. The keycap is movable relative to the base plate through the two supports. The support is pivotally connected to the base plate through a pivotal connection structure that includes a guiding slot and a protruding shaft oppositely disposed on the support and the base plate. The guiding slot has an opening and an indentation portion. The opening is located at an upper end of the guiding slot. The protruding shaft enters the guiding slot from the opening to rotatably fit in the indentation portion, so that the support is pivotally connected to the base plate.