A key structure includes a base plate, a key cap, a positioning base, a positioning cover, and a spring. The key cap is disposed above the base plate and has a bottom surface. The positioning base is connected to the bottom surface of the key cap and has a positioning recess. The positioning cover is slidably connected to the positioning base, is inserted into the positioning recess, and includes a bottom portion and a side wall. The spring includes a first spring portion and a second spring portion. The first spring portion is located in the positioning recess and is in contact with the bottom surface of the key cap. The second spring portion is located in the positioning cover. The first spring portion is located on a path on which the side wall of the positioning cover slides toward the bottom surface of the key cap.

A key structure includes a base plate, a key cap, a positioning base, a positioning cover, and a spring. The key cap is disposed above the base plate and has a bottom surface. The positioning base is connected to the bottom surface of the key cap and has a positioning recess. The positioning cover is slidably connected to the positioning base, is inserted into the positioning recess, and includes a bottom portion and a side wall. The spring includes a first spring portion and a second spring portion. The first spring portion is located in the positioning recess and is in contact with the bottom surface of the key cap. The second spring portion is located in the positioning cover. An orthographic projection of the first spring portion on the bottom surface of the key cap is overlapped with an orthographic projection of the side wall of the positioning cover on the bottom surface of the key cap.

A key structure includes a base plate, a key cap, a positioning base, a positioning cover, and a spring. The key cap is disposed above the base plate and has a bottom surface. The positioning base is connected to the bottom surface of the key cap and has a positioning recess. The positioning cover is slidably connected to the positioning base, is inserted into the positioning recess, and includes a bottom portion and a side wall. The spring includes a first spring portion and a second spring portion. The first spring portion is located in the positioning recess and is in contact with the bottom surface of the key cap. The second spring portion is located in the positioning cover. The first spring portion is located on a path on which the side wall of the positioning cover slides toward the bottom surface of the key cap.

A push switch includes a case having a housing space with an upper opening, fixed contacts provided at a bottom of the housing space in the case, a movable contact member having a dome-shaped member, the movable contact member being disposed in the housing space, and having a central portion that is brought into contact with the fixed contacts by inverting the movable contact member in response to the movable contact member being pushed by an operator, and a pushing member is disposed above the movable contact member, and the pushing member is configured to push the movable contact portion directly or through other portions upon being pushed by the operator. The pushing member pushes a portion being situated outside of a central portion of the movable contact member directly or through other portions.

A keypad includes a base, an actuator, a first and second elastic member and a pivotal mechanism. The base has a through hole. The actuator is located in through hole to be moved between initial position and pressed position. The first elastic member is connected between the base and the actuator. The pivotal mechanism is pivotably and linearly movably disposed on the actuator to be moved between withdrawn position and protruding position. The second elastic member is connected between the actuator and the pivotal mechanism. The base has stop block and recess and the pivotal mechanism has tooth. While the actuator is moved to the pressed position, the tooth is stopped by the stop block so that the pivotal mechanism is pivoted and then linearly moved to the withdrawn position, and then enters into the recess, enabling the pivotal mechanism to the protruding position and press a switch.

The invention discloses a keyboard switch including a base, a cover covering the base to form a cavity, an upper guide core disposed in the cavity and an upper guide core limiting mechanism including a lower guide core elastomer, a lower guide core, a middle guide core spring and a middle guide core sequentially disposed on the base. The upper guide core and the middle guide core are connected through an upper guide core spring. The keyboard switch of the invention provides accuracy of the press-conduction displacement, accurate positioning of the conduction course, and adjustability of the press force, such that the press force becomes more balanced, and the keyboard switch is conducted when the guide core is pressed downwards. Thus, the overall press stability of the keyboard switch is improved.

A keypad includes a base, an actuator, a first and second elastic member and a pivotal mechanism. The base has a through hole. The actuator is located in through hole to be moved between initial position and pressed position. The first elastic member is connected between the base and the actuator. The pivotal mechanism is pivotably and linearly movably disposed on the actuator to be moved between withdrawn position and protruding position. The second elastic member is connected between the actuator and the pivotal mechanism. The base has stop block and recess and the pivotal mechanism has tooth. While the actuator is moved to the pressed position, the tooth is stopped by the stop block so that the pivotal mechanism is pivoted and then linearly moved to the withdrawn position, and then enters into the recess, enabling the pivotal mechanism to the protruding position and press a switch.

An input device with an adjustable force level is provided. The input device includes a circuit board and a key structure. The key structure includes a key body, a casing and a pressure-adjustable elastic receptacle. The pressure-adjustable elastic receptacle is partially or completely accommodated within the casing and sustaining the key body. When the key body is moved downwardly, a resisting force to resist the key body is provided by the pressure-adjustable elastic receptacle and the force level of the resisting force is adjusted by the user. When a force with the force level is applied to the key body by the user, a switch of the circuit board is triggered.

The invention discloses a keyboard switch including a base, a cover covering the base to form a cavity, an upper guide core disposed in the cavity and an upper guide core limiting mechanism including a lower guide core elastomer, a lower guide core, a middle guide core spring and a middle guide core sequentially disposed on the base. The upper guide core and the middle guide core are connected through an upper guide core spring. The keyboard switch of the invention provides accuracy of the press-conduction displacement, accurate positioning of the conduction course, and adjustability of the press force, such that the press force becomes more balanced, and the keyboard switch is conducted when the guide core is pressed downwards. Thus, the overall press stability of the keyboard switch is improved.

An input device includes at least one key structure and a film circuit board disposed below the key structure. The key structure includes a top cover, a plunger, a sleeve, a rod, a first elastic element, a second elastic element and a bottom cover. The plunger is assembled on the top cover and has a protruding portion protruding from a first opening of the top cover and a guiding portion. The sleeve is assembled inside the plunger. The rod is movably disposed in the sleeve. The first elastic element is disposed in the rod, wherein the guiding portion passes through the first elastic element so that a first end of the first elastic element leans against the plunger. The bottom cover having a second opening locks the top cover. A second end and a third end of the second elastic element respectively lean against the sleeve and the bottom cover.