A membrane switch in which a first conductive part is formed on a first substrate, a second conductive part is formed on a second substrate, and the substrates are layered via a spacer such that the conductive parts face each other with a space therebetween, and an organic material showing piezoelectricity is filled, or disposed in the space such that an air gap is present, are useful for obtaining an output signal corresponding to an applied pressure.

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 switch unit includes a substrate, which includes a hard layer and a soft layer; a first contact point above the soft layer; a second contact point around the first contact point; a conduction spring member which is elastically deformable into contact with the first contact point to make a conduction between the first contact point and the second contact point; a first external electrode; a first through-hole electrode which is electrically connected to the first contact point; and a first wiring pattern, which is electrically connected to the first external electrode and the first through-hole electrode.

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.

The present application discloses a keyboard, which includes a base plate and a thin film circuit board. The base plate includes a first part, a second part and an inclined part. The first part has a first limiting portion and a second limiting portion, the second part has a third limiting portion. The thin film circuit board includes a first region, a second region and at least one connecting portion. The first region is located on the first part, and the first region has at least one opening. The first limiting portion and the second limiting portion are disposed in said opening. The second region is located on the second part, and the second region has at least one opening. The connecting portion is located on the inclined part, and the third limiting portion is passed through the opening of the second part and propped against the connecting portion.

A keyboard is disclosed, which includes a base plate and a thin film circuit board. The base plate includes a first part, a second part, and an inclined part. Two edges of the inclined part are connected to the first part and the second part, respectively. The inclined part includes a hollow portion. The thin film circuit board is disposed on the base plate and includes a first region, a second region, and a connecting portion. The connecting portion has a first connecting end, a second connecting end, and an inclined segment. The first connecting end is connected to the first region; the second connecting end is connected to the second region. The first connecting end and the second connecting end correspond to different positions on an axial direction. Moreover, part of the inclined segment is located in the hollow portion.

A keyboard is disclosed, which includes a base plate and a thin film circuit board. The base plate includes a first part, a second part, and an inclined part. Two edges of the inclined part are connected to the first part and the second part, respectively. The inclined part includes a hollow portion. The thin film circuit board is disposed on the base plate and includes a first region, a second region, and a connecting portion. The connecting portion has a first connecting end, a second connecting end, and an inclined segment. The first connecting end is connected to the first region; the second connecting end is connected to the second region. The first connecting end and the second connecting end correspond to different positions on an axial direction. Moreover, part of the inclined segment is located in the hollow portion.

The present application discloses a keyboard, which includes a base plate and a thin film circuit board. The base plate includes a first part, a second part and an inclined part. The first part has a first limiting portion and a second limiting portion, the second part has a third limiting portion. The thin film circuit board includes a first region, a second region and at least one connecting portion. The first region is located on the first part, and the first region has at least one opening. The first limiting portion and the second limiting portion are disposed in said opening. The second region is located on the second part, and the second region has at least one opening. The connecting portion is located on the inclined part, and the third limiting portion is passed through the opening of the second part and propped against the connecting portion.

A key structure with reduced resonant noise includes a base plate formed with a first supporting portion and a second supporting portion, a conductive film layer, an elastic conducting element, a linking rod, and a keycap on the linking rod. The linking rod has a main portion, a first arm extended from one end of the main portion and pivotally connected to the first supporting portion, and a second arm extended from the other end of the main portion and pivotally connected to the second supporting portion. The key cap has a bottom surface pivotally connected to the main portion of the linking rod. The base plate has openings under the linking rod and adjacent to the first supporting portion and the second supporting portion. The openings can reduce resonant effect of clapping sound in the keycap, when the keycap is pressed.