Patent ID: 6653586
Filing Date: 2003-11-25
Classification: H01H

Abstract:
A key structure located in a keyboard for outputting a preset signal, comprising:a key cap located on the keyboard, which has an un-depressing position and a depressed position; a first elastic dome located on one side of the key cap for holding the key cap in the un-depressing position in normal conditions, which has elasticity to return the key cap to the un-depressing position after being depressed; and a second elastic dome located on another side of the key cap opposite to the first elastic dome for jointly holding the key cap with the first elastic dome in the un-depressing position in normal conditions, which has elasticity to return the key cap to the un-depressing position after being depressed, the second elastic dome having a compression displacement shorter than that of the first elastic dome to allow the key cap moving down towards a direction of the first elastic dome until reaching the depressed position for outputting the preset signal.