Key structure

A key structure, comprising:

• a keycap;
• and
• an actuator, wherein the actuator is coupled with the keycap and enables the keycap to move reciprocally along an actuating direction;
• wherein, one of the actuator and the keycap has a base and a slot formed in the base, and the other one of the actuator and the keycap has a plug;
• the plug is inserted into the slot in a direction parallel to the actuating direction;
• the slot has an inner wall squeezing against the plug and generating friction;
• the base has a first sidewall thickness and a second sidewall thickness;
• the first sidewall thickness is perpendicular to the actuating direction and parallel to the inner wall, the second sidewall thickness perpendicular to the actuating direction and perpendicular to the inner wall, and the first sidewall thickness is greater than the second sidewall thickness;
• wherein the slot is a cross-shaped recess comprising a first groove and a second groove cross each other and having a cross-section perpendicular to the actuating direction;
• the first groove has a first extending axis perpendicular to the actuating direction and parallel to the inner wall;
• the second groove has a second extending axis perpendicular both to the actuating direction and the inner wall;
• the first sidewall thickness is measured from one end of the first extending axis to an edge of the base, and the second sidewall thickness is measured from one end of the second extending axis to the edge of the base.