Structure of key switch

DETAILED DESCRIPTION The present invention eliminates the aforesaid problems.
According to one aspect of the present invention, there is provided a key switch which comprises a rectangular key cap having a unitary, hollow, rectangular plunger inserted into a rectangular hole on a key base and pressed to squeeze a rubber tone causing a conductor to electrically connect a contact on the printed circuit board of a keyboard.
Because the rectangular plunger and the rectangular key cap are integrally made into a unitary piece, the assembly process of the key switch is simplified, and the total height of the key switch is greatly reduced.
According to another aspect of the present invention, the rectangular plunger has four circular rails on the four corners thereof along its length respectively inserted in four circular grooves on the rectangular guide slot of the key base for stable movement, and two smoothly curved, hooked spring plates releasably hooked with two opposite hooked portions on the key base for positioning.
This arrangement stabilizes the movement of the rectangular plunger in the rectangular slot on the key base and greatly reduces the noise level during the operation of the key switch.