A base unit for a keyboard is presented. The base unit has a substantially rectangular layout. The base unit includes an equipment portion, formed so that it can be equipped with a plurality of key switches for the keyboard. The equipment portion is arranged on a first side of the base unit. The base unit further comprises at least one coupling portion for mechanically coupling the base unit to an accessory module for the keyboard. Each coupling portion includes a first coupling feature and a second coupling feature. The first coupling feature is arranged on the first side of the base unit, and the second coupling feature is arranged on a second side of the base unit facing away from the first side. Each coupling feature is arranged parallel to a long side of the base unit continuously between narrow sides of the base unit. The first coupling feature is formed for positive locking with a first mounting feature of the accessory module. The second coupling feature is formed for positive locking with a second mounting feature of the accessory module.

Panel assemblies and button trees for panel assemblies are provided. In one embodiment, a button tree includes a frame, and a plurality of arms extending from the frame. At least one of the plurality of arms includes a plurality of branches. The button tree further includes a button connected to the frame by the plurality of arms, wherein each branch of the plurality of branches contacts the button. In another embodiment, a button tree includes a frame, and a plurality of arms extending from the frame. The button tree further includes a button defining a central axis, the button connected to the frame by the plurality of arms, the button including a face surface and an edge surface. The button tree further includes a locating feature extending on the edge surface generally co-axially with the central axis.

A keyboard device includes a bottom cover, a supporting plate, a flexible circuit board and plural key structures. The supporting plate is installed on the bottom cover. The supporting plate has a curved arc-shaped profile that is bent upwardly in a direction away from the bottom cover. The supporting plate includes plural perforations. The flexible circuit board is arranged between the bottom cover and the supporting plate. The plural key structures are installed on the supporting plate. The plural key structures are penetrated through the corresponding perforations and contacted with the flexible circuit board.

A keyboard device includes a substrate and keycaps disposed on the substrate. The substrate includes a long slit and an elastic bridge member. The long slit divides the substrate into a first plate having a first side edge and a second plate having a second side edge opposite to the first side edge. A gap is between the first side edge and the second side edge. The elastic bridge member is connected between the first side edge and the second side edge. The first plate is movable relative to the second plate. The first side edge includes a first bridge seat. The second side edge includes a second bridge seat. The elastic bridge member is connected between the first bridge seat and the second bridge seat. The elastic bridge member includes a wedge portion connected to an inner corner between the elastic bridge member and the first bridge seat.

A keyboard device includes a substrate and keycaps disposed on the substrate. The substrate includes a long slit and an elastic bridge component. The long slit divides the substrate into a first plate having a first side edge and a second plate having a second side edge opposite to the first side edge. A gap is between the first side edge and the second side edge. The elastic bridge component is connected between the first side edge and the second side edge. The first plate is movable relative to the second plate. The first side edge includes two first bridge connections. The second side edge includes two second bridge connections. The elastic bridge component includes a first elastic bar connected between the first bridge connections, a second elastic bar connected between the second bridge connections, and a connecting member connected between the first elastic bar and the second elastic bar.

A keyboard device includes a substrate, keycaps, and a frame. The substrate has a top surface and a bottom surface and includes a welding-fixing portion. The welding-fixing portion includes a through hole and an arch-shaped bridge member. The arch-shaped bridge member is connected in the through hole and divides the through hole into partition holes. The arch-shaped bridge member has an arch portion and bridge bases. The arch portion protrudes from the top surface to form a recessed portion. The frame is disposed on the top surface and includes hollow holes respectively corresponding to the keycaps. The frame includes a welding member, and the welding member includes welding posts and a welding-fixing base. The welding posts respectively pass through spaces between the edge portion of the through hole and the arch-shaped bridge member. The welding-fixing base is received and fixed in the through hole and the recessed portion.

A keyboard device includes a substrate, keycaps, and a frame. The substrate has a top surface and a bottom surface and includes a welding-fixing portion. The welding-fixing portion includes a through hole and an arch-shaped bridge member. The arch-shaped bridge member is connected in the through hole and divides the through hole into partition holes. The arch-shaped bridge member has an arch portion and bridge bases. The arch portion protrudes from the top surface to form a recessed portion. The frame is disposed on the top surface and includes hollow holes respectively corresponding to the keycaps. The frame includes a welding member, and the welding member includes welding posts and a welding-fixing base. The welding posts respectively pass through spaces between the edge portion of the through hole and the arch-shaped bridge member. The welding-fixing base is received and fixed in the through hole and the recessed portion.

A keyboard device includes a substrate and keycaps disposed on the substrate. The substrate includes a long slit and an elastic bridge member. The long slit divides the substrate into a first plate having a first side edge and a second plate having a second side edge opposite to the first side edge. A gap is between the first side edge and the second side edge. The elastic bridge member is connected between the first side edge and the second side edge. The first plate is movable relative to the second plate. The first side edge includes a first bridge seat. The second side edge includes a second bridge seat. The elastic bridge member is connected between the first bridge seat and the second bridge seat. The elastic bridge member includes a wedge portion connected to an inner corner between the elastic bridge member and the first bridge seat.

A keyboard device includes a substrate and keycaps disposed on the substrate. The substrate includes a long slit and an elastic bridge component. The long slit divides the substrate into a first plate having a first side edge and a second plate having a second side edge opposite to the first side edge. A gap is between the first side edge and the second side edge. The elastic bridge component is connected between the first side edge and the second side edge. The first plate is movable relative to the second plate. The first side edge includes two first bridge connections. The second side edge includes two second bridge connections. The elastic bridge component includes a first elastic bar connected between the first bridge connections, a second elastic bar connected between the second bridge connections, and a connecting member connected between the first elastic bar and the second elastic bar.

A waterproof keyboard structure and an assembly method thereof are provided. The waterproof keyboard structure includes a keyboard module, and a keyboard frame framing on the keyboard module, wherein an elastic waterproof layer is formed by means of double injection or insert molding on the keyboard frame. The keyboard module is defined with a key surface, and an assembly surface arranged opposite to the key surface. The elastic waterproof layer is clad on the key surface, and the keyboard module with the assembly surface facing a seat is assembled together with the keyboard frame in an accommodating space, thereby having the elastic waterproof layer closely fit with the seat to form a waterproof ring.