Key switch
A computer keyboard is generally comprised of a shell, a membrane circuit, a conductive rubber pad supported on the membrane circuit and having a plurality of rubber cones, a key holder frame having a plurality of key holders respectively disposed above the rubber cones, and a set of key switches respectively mounted on the key holders of the key holder frame above the rubber cones. A key switch for a computer keyboard is generally comprised of a rubber cone mounted on a membrane circuit above a frame, and a key cap having a bottom plunger inserted through an axle hole on a locating board and supported on the rubber cone. Each of the key switches includes a key top on which a letter is printed, an elastic member made of a rubber material, a membrane contact sheet and a base plate. When the key cap is depressed, the plunger is lowered with the key cap to compress the rubber cone, causing the rubber cone to trigger a corresponding contact at the membrane circuit. In general, key switches for computer keyboards include two types including the mechanical key switches and membrane key switches. Mechanical key switches are commonly comprised of a key base, a key cap with plunger means vertically slidably mounted in the key base, a spring means which automatically pushes the key cap back to its former position after each operation, triggering spring means attached to the circuit board of the keyboard and forced to trigger a contact at the circuit board and to produce a click sound upon each down stroke of the key cap. In a membrane key switch, a rubber cone is mounted on a membrane circuit within a key base, and a key cap is vertically slidably coupled to the key base and depressed to compress the rubber cone, causing the rubber cone to trigger a contact at the membrane circuit.
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