Patent ID: 7135647

Claim:
A keyboard switch, comprising: a base plate; a membrane sheet disposed on said base plate and resiliently supporting spaced contact pieces thereon; a housing disposed on said membrane sheet; a key-top having an upper portion generally parallel to the base plate and skirt portions depending from the upper portion and toward the base plate, extending substantially about the periphery of the upper portion and having lower edges defining a lower periphery of the key-top; a link mechanism disposed between said housing and said key-top and resiliently maintaining said key-top in an elevated position relatively to the base plate; and a switching operation unit disposed under said key-top and moved by depressing the key-top toward the base plate, causing the contact pieces carried by the membrane sheet to be moved, against the resilient spacing of the membrane sheet, into contact with each other; and said housing having a slit extending therethrough and receiving lower edges of the skirt portions of said key-top therein, permitting the lower periphery of the key-top to be disposed below upper surface of the housing when the key-top is fully depressed.