An electronic device includes a housing, a button module and a control board. The button module includes a button cap having a space, a follower movably disposed in the space, and an elastic member. A movable cavity is defined by a portion of the follower located in the space and an inner surface of the button cap. The elastic member is disposed in the movable cavity, and two ends of the elastic member respectively abut against the inner surface of the button cap and the follower. An amount of compression of the elastic member is varied in response to the size of the movable cavity. When the button cap is in an unpressed state, the elastic member has a first amount of compression and generates a restoring force; when the button cap is in a pressed state, the follower abuts against a switch unit of the control board correspondingly.

The present invention relates to a Hall Principle-based LED lit mechanical keyboard switch comprising a keymodule, permanent magnet, housing, LED lamp, Hall switch, elastic strip, top cover and spring; the keymodule consists of a plunger and a slider, the plunger has a key on top and a first locating pole at bottom; the slider has magnet mounting slot on its side wall; a second locating pole is provided at the bottom center inside the housing, the second locating pole is provided with a guide hole at its center, and a LED lamp mounting hole is provided on one side in the housing; Hall switch mounting hole and plunger slideway are provided on the neighboring side next to the side of the housing on which LED lamp mounting hole is provided.

The keyswitch structure uses two linkages form as V-shaped to support a keycap when the keycap is moved up and down. A first linkage and a second linkage are coupled with each other and also coupled with a support on a base respectively in a line contacting way, thereby forming a first axis, a second axis, and a third axis. The third axis is located between the first axis and the second axis. As the keycap is pressed to move downward, the keycap brings the two linkages and the support of the base to have relative rotation movement. Due to the geometric feature between the three axes, part of the linkages between the axes or the support of the base may be caused to slightly deform to provide a resilient restoring force that can move the keycap upward to a position not being pressed.

A key structure is provided. The key structure comprises a substrate, a membrane circuit disposed on the substrate, a conduction switch disposed on the membrane circuit, a keycap, a bending portion fixed to the keycap, an elastic member disposed on the membrane circuit and abutting against the keycap, and a connecting rod disposed movably between the membrane circuit and the keycap. The connecting rod includes an operating arm and an engaging portion. The operating arm is connected to the engaging portion, and the engaging portion selectively engages with the bending portion. When the operating arm moves in a direction parallel to a surface of the keycap, the operating arm drives the engaging portion to disengage from the bending portion and the elastic member provides a force against the keycap to move the keycap away from the conduction switch.

A key structure comprising an upper and lower key stem, a rotatable middle key stem including a magnetized element disposed therein, the rotatable middle key stem coupled between and in axial alignment with the upper and lower key stems, and a magnetic field generator configured to steer a magnetic field through the magnetized element of the rotatable middle key stem. The rotatable middle key stem is operable to be longitudinally rotatable between a first and second position, while the upper and lower key stems are rotationally fixed. The generated magnetic field, when at a first setting, applies a first magnetic force on the magnetized element causing the middle key stem to rotate to the first position, and when at a second setting, applies a second magnetic force on the magnetized element causing the middle key stem to rotate to the second position.