Embodiments disclosed herein describe a base, an operation unit that moves in a contacting/separating direction with respect to the base in response to an external force, and a pair of link members turnably coupled to each other by a coupling portion and configured to guide movement of the operation unit in the contacting/separating direction. The pair of link members includes a first curved portion and a second curved portion that are supported on the base, and a first rotary spindle and a second rotary spindle that are supported on the operation unit. When the operation unit moves in the contacting/separating direction with respect to the base, the first curved portion and the second curved portion slide with respect to the base in a direction substantially perpendicular to the contacting/separating direction and in a direction substantially perpendicular to a turning shaft of the pair of link members.

Embodiments disclosed herein describe a base, an operation unit that moves in a contacting/separating direction with respect to the base in response to an external force, and a pair of link members turnably coupled to each other by a coupling portion and configured to guide movement of the operation unit in the contacting/separating direction. The pair of link members includes a first curved portion and a second curved portion that are supported on the base, and a first rotary spindle and a second rotary spindle that are supported on the operation unit. When the operation unit moves in the contacting/separating direction with respect to the base, the first curved portion and the second curved portion slide with respect to the base in a direction substantially perpendicular to the contacting/separating direction and in a direction substantially perpendicular to a turning shaft of the pair of link members.

A switch device includes a push button to be displaced in a direction toward a main body by a push operation performed on an operation surface thereof, a light source to emit an illumination light from an internal portion of the push button toward the operation surface, and a first substrate that is arranged in the push button in a state of mounting the light source so as to be displaced integrally with the push button upon the push operation.

A switch device includes a push button to be displaced in a direction toward a main body by a push operation performed on an operation surface thereof, a light source to emit an illumination light from an internal portion of the push button toward the operation surface, and a first substrate that is arranged in the push button in a state of mounting the light source so as to be displaced integrally with the push button upon the push operation.

A key module includes an actuation element with a cam nose and a contactor unit with a contact nose movable in the direction of the movement axis and transverse to the direction of the movement axis. Also, a contact element is formed and arranged for establishing electric contact with the contact nose. Moreover, the housing element accommodates the contact element, the contactor unit and the actuation element, wherein the actuation element and/or the cam nose includes a constructive element formed to deflect the contact nose from a rest position adjacent to the contact element in the direction along and/or transverse to the movement axis upon a defined movement of the actuation element, then abruptly release it so that the movable contact nose returns to the rest position and strikes the contact element and/or the housing element. Electric contact with the contact element is established and acoustic noise is produced.

A key module includes an actuation element with a cam nose and a contactor unit with a contact nose movable in the direction of the movement axis and transverse to the direction of the movement axis. Also, a contact element is formed and arranged for establishing electric contact with the contact nose. Moreover, the housing element accommodates the contact element, the contactor unit and the actuation element, wherein the actuation element and/or the cam nose includes a constructive element formed to deflect the contact nose from a rest position adjacent to the contact element in the direction along and/or transverse to the movement axis upon a defined movement of the actuation element, then abruptly release it so that the movable contact nose returns to the rest position and strikes the contact element and/or the housing element. Electric contact with the contact element is established and acoustic noise is produced.

A variable force key, including a housing, a central shaft, and a magnetic ring, the central shaft extends into the housing, the top end of the center shaft is fixedly provided with a key cap seat, the central shaft can reciprocate in the housing in the vertical direction, the bottom end of the central shaft is fixedly provided with a limit member, the outer wall or inner wall of the bottom end of the limit member is provided with a flange, the magnetic ring sleeves the outer wall of the limit member or is arranged inside the limit member and located at the upper end of the flange. The variable force key further includes an electromagnet or a hollow coil, which is arranged at the bottom in the housing, and when the central shaft moves downward, the electromagnet or the hollow coil can penetrate inside the limit member.

A variable force key, including a housing, a central shaft, and a magnetic ring, the central shaft extends into the housing, the top end of the center shaft is fixedly provided with a key cap seat, the central shaft can reciprocate in the housing in the vertical direction, the bottom end of the central shaft is fixedly provided with a limit member, the outer wall or inner wall of the bottom end of the limit member is provided with a flange, the magnetic ring sleeves the outer wall of the limit member or is arranged inside the limit member and located at the upper end of the flange. The variable force key further includes an electromagnet or a hollow coil, which is arranged at the bottom in the housing, and when the central shaft moves downward, the electromagnet or the hollow coil can penetrate inside the limit member.

An illuminated keyswitch structure includes a base plate, a drive circuit board under the base plate, a spacer between the drive circuit board and the base plate, and a light-emitting part on the circuit board. The spacer has a through hole communicating with an opening of the base plate in a vertical direction. The sidewall of the through hole is opaque. The light-emitting part is located in the through hole, and falls within a projection of the opening in the vertical direction. The light-emitting part has a top surface that is lower than or equal to a bottom surface of the base plate in the vertical direction. The structure of the illuminated keyswitch structure around the light-emitting part can keep flat by the spacer. The spacer can prevent the light-emitting part from structurally entering the opening, avoiding structural interference between the light-emitting part and other components above the base plate.

A push switch including a pressing member, a movable contact, an interposed member, a first fixed contact, and a second fixed contact is provided. The pressing member includes a pressing portion configured to be pressed, and includes an elastically deformable peripheral wall portion having a lower end portion and extending downward and outward from the outer periphery of the pressing portion. The movable contact has a dome shape and is disposed below the pressing member. The interposed member is disposed between the pressing member and the movable contact, and is configured to press the movable contact by receiving and being pressed by the lower end portion of the peripheral wall portion of the pressing member. The lower end portion of the peripheral wall portion of the pressing member presses the interposed member while the peripheral wall portion is subjected to elastic deformation in response to the pressing portion being pressed.