A key structure includes a carrying body, a frame body, a keycap and at least two independent connecting members. The frame body is disposed on the carrying body and forms plurality of sliding grooves. The keycap has a plurality of cap edges and is disposed with a plurality of pivoting portions. The at least two connecting members are each connected between the keycap and the frame body, corresponding to two of the cap edges opposite to each other. Each connecting member includes a pivoting rod and a sliding rod. Each pivoting rod pivots on one of the pivoting portions, and each sliding rod is slidably limited in one of the sliding grooves. This design has preferred structural strength, smooth pressing movement and reliable pressing contact.

A keyboard switch, including a base; a static contact; a moving contact; an upper cover; a button; a reset spring; an X-shaped rack structure; and a holding part. The X-shaped rack structure includes a first connecting rack and a second connecting rack. The first connecting rack includes a first balancing lever and two first connecting parts sleeving on the first balancing lever, the second connecting rack includes a second balancing lever and two second connecting parts sleeving on the second balancing lever; opposite surfaces of the two first connecting parts each are provided with one boss, facing surfaces of the two second connecting parts each are provided with one round hole, and the boss is inserted in the round hole so that two ends of the two first connecting racks and two ends of the two second connecting racks are connected to form two X-shaped structures.

A key structure includes a base, a triggering element, a keycap and a scissors-type connecting element. The keycap is disposed over the triggering element. When an external force is applied to the keycap, the triggering element is pushed by the keycap. The scissors-type connecting element is connected with the keycap and the base. The scissors-type connecting element includes a first frame and a second frame. The first frame includes a keycap post, a base post and a bulge. The bulge is externally extended from a first end of the first frame and located at a side of the keycap post, and the bulge is protruded from a sidewall of the first frame. Due to the bulge, the structured strength of the keycap post is enhanced.

A keyswitch structure includes a base plate, a key cap, a key base, a recovering member and a linkage mechanism having linkage members. The key base is disposed between the key cap and the base plate. The recovering member is disposed between the key cap and the base plate. The linkage members are physically separated from each other, and are respectively inclinedly disposed between the key base and the key cap, and collectively surround the recovering member. One end of each of the linkage members is pivotally connected to the key base, and the other end of each of the linkage members is slidably connected to the key cap.

A push switch is provided with a switch case, a push button, a switch component, a terminal member and a lead wire. The terminal member has a flat part and a first suspended part suspended from one end of the flat part. The flat part includes a first connecting part to which the connecting terminal is connected without soldering. The first suspended part includes a second connecting part to which the lead wire is connected without soldering. The switch case has first support part for supporting the lead wire which is inserted into the space, and second support part for supporting the flat part of the terminal member.

A keyboard device includes plural keycaps and a membrane switch circuit member. The membrane switch circuit member is disposed under the plural keycaps. The membrane switch circuit member includes a wiring board and plural separate covering pads. The wiring board includes plural first trace patterns and plural second trace patterns corresponding to the plural keycaps. The plural second trace patterns are disposed on the wiring board and separated from the plural first trace patterns. There is a gap between each first trace pattern and the adjacent second trace pattern. The covering pads are disposed over the wiring board. The plural covering pads are aligned with the corresponding keycaps and cover the corresponding gaps. The covering pad has a triggering trace pattern over the corresponding gap.

A mechanical axle structure suitable for a key includes a base, a function axle for generating a switch signal and a cover plate. The base, the function axle and the cover plate are connected in order from bottom to top. An upper portion of a supporting piece is fixed with a bottom surface of the cover plate, while a lower portion is fixed with the base. The function axle passes through the supporting piece to support against the bottom surface of the cover plate.

A thin-film switch includes an upper conducting layer, a lower conducting layer and an insulating layer, wherein the insulating layer is located between the upper conducting layer and the lower conducting layer, one of the upper conducting layer and the lower conducting layer includes a conducting circuit layer and an anode triggering portion and a cathode triggering portion that are arranged on the conducting circuit layer, the other layer includes a first base material and a conductor that is arranged on the first base material and is conducted with the anode triggering portion and the cathode triggering portion. Both the anode triggering portion and the cathode triggering portion are arranged on the upper conducting layer or the lower conducting layer at the same time, the corresponding lower conducting layer or upper conducting layer is provided with the conductor with a conducting function, the conductor contacts with both the anode triggering portion and the cathode triggering portion at the same time when pressing the thin-film switch, both the anode and the cathode are conducted, and the switch is on.

A thin-film switch includes an upper conducting layer, a lower conducting layer and an insulating layer, wherein the insulating layer is located between the upper conducting layer and the lower conducting layer, one of the upper conducting layer and the lower conducting layer includes a conducting circuit layer and an anode triggering portion and a cathode triggering portion that are arranged on the conducting circuit layer, the other layer includes a first base material and a conductor that is arranged on the first base material and is conducted with the anode triggering portion and the cathode triggering portion. Both the anode triggering portion and the cathode triggering portion are arranged on the upper conducting layer or the lower conducting layer at the same time, the corresponding lower conducting layer or upper conducting layer is provided with the conductor with a conducting function, the conductor contacts with both the anode triggering portion and the cathode triggering portion at the same time when pressing the thin-film switch, both the anode and the cathode are conducted, and the switch is on.

A method for control device adjustment comprising applying a preload simultaneously to a plurality of shafts of a control device so as to take up initial assembly play, wherein the control device comprises an upper actuating element that is movable relative to a lower supporting mounting, a lower supporting mounting, a switch that is actuated by the upper actuating element, and an articulated structure that is interposed vertically between the upper actuating element and the lower mounting to keep the upper actuating element parallel to a horizontal plane during its vertical downward movement relative to a frame, and the at least one shaft. The method also comprises providing an adjustment stop fixed relative to the lower mounting and forming a stop surface that interacts with a facing portion of the shaft.