In a first aspect of the present disclosure, a push switch includes a resilient member that is made of metal, and the resilient member including a concave shape and an opening that is positioned at a center of the concave shape and at least two protrusions each protruding outward and downward with an oblique angle around the concave shape.

Implementations of a multi-pole dome switch configured to simultaneously, or nearly simultaneously, close or open two separate circuits are provided. In some implementations, a multi-pole dome switch may comprise a tactile metal dome and a conductive insert that are separated by an insulator. In some implementations, when the dome is depressed, the dome and the conductive insert are configured to simultaneously, or nearly simultaneously, make conductive contact with two traces of a first circuit and two traces of a second circuit, respectively, positioned thereunder on a PCB. In this way, the multi-pole dome switch is able to simultaneously, or nearly simultaneously, close two separate circuits. Succinctly put, in some implementations, the multi-pole dome switch may be configured to act as a double-pole, double-throw switch.

A push switch includes a movable contact including a dome part that is shaped like a dome and configured to be inverted in shape when pressed, and a fixed contact including a first fixed contact, the movable contact being configured to be brought into contact with and away from the first fixed contact. The push switch is configured such that an operating load necessary to press the movable contact gradually increases after the movable contact starts to be pressed, decreases thereafter when the dome part is inverted, and increases again when the movable contact is further pressed, and the dome part contacts the first fixed contact after an inflection point at which the decreased operating load starts to increase again.

A keyboard includes a plurality of key modules. Each key module includes a baseplate, a circuit membrane disposed on the baseplate, a metal dome disposed on the circuit membrane, an elastic member disposed on the metal dome, and a keycap. The elastic member and the linkage member are configured to be a movable switch mechanism. The circuit membrane has a conductive circuit. The metal dome has an opening corresponding to the conductive circuit of the circuit membrane. A trigger portion protrudes from an underside of the elastic member. When the keycap is pressed, the trigger portion passes through the opening of the metal dome, and moves downwards to abut against the conductive circuit to induce a conducting signal. The movable switch mechanism can be made by a double injection molding method.

Implementations of a multi-pole dome switch configured to simultaneously, or nearly simultaneously, close or open two separate circuits are provided. In some implementations, a multi-pole dome switch may comprise a tactile metal dome and a conductive insert that are separated by an insulator. In some implementations, when the dome is depressed, the dome and the conductive insert are configured to simultaneously, or nearly simultaneously, make conductive contact with two traces of a first circuit and two traces of a second circuit, respectively, positioned thereunder on a PCB. In this way, the multi-pole dome switch is able to simultaneously, or nearly simultaneously, close two separate circuits. Succinctly put, in some implementations, the multi-pole dome switch may be configured to act as a double-pole, double-throw switch.

In a first aspect of the present disclosure, a spring plate includes a central portion; a first leg portion projecting outward from an edge of the central portion; and a second leg portion projecting outward from the edge of the central portion. The first leg portion includes a hollow portion that is positioned within an outline of the first leg portion in a top plan view, and the second leg portion includes a hollow portion that is positioned within an outline of the second leg portion in a top plan view.

In a first aspect of the present disclosure, a spring plate includes a central portion; a first leg portion projecting outward from an edge of the central portion; and a second leg portion projecting outward from the edge of the central portion. The first leg portion includes a hollow portion that is positioned within an outline of the first leg portion in a top plan view, and the second leg portion includes a hollow portion that is positioned within an outline of the second leg portion in a top plan view.

In a first aspect of the present disclosure, a push switch includes a resilient member that is made of metal, and the resilient member including a concave shape and an opening that is positioned at a center of the concave shape and at least two protrusions each protruding outward and downward with an oblique angle around the concave shape.