A key structure includes a membrane circuit board, an elastic element and a high impedance layer. The membrane circuit board includes a lower plate, an upper plate, a spacer plate and a circuit layer. The upper plate is located over the lower plate. The upper plate has an opening through the upper plate. The spacer plate is arranged between the lower plate and the upper plate. The circuit layer is arranged between the spacer plate and the upper plate. The elastic element is disposed on the membrane circuit board and substantially aligned with opening. The high impedance layer is disposed on a bottom surface of a bottom part of the elastic element and disposed within the opening of the upper plate. The high impedance layer is in contact with a part of the circuit layer.

A key structure includes a membrane circuit board, an elastic element and a high impedance layer. The membrane circuit board includes a lower plate, an upper plate, a spacer plate and a circuit layer. The upper plate is located over the lower plate. The upper plate has an opening through the upper plate. The spacer plate is arranged between the lower plate and the upper plate. The circuit layer is arranged between the spacer plate and the upper plate. The elastic element is disposed on the membrane circuit board and substantially aligned with opening. The high impedance layer is disposed on a bottom surface of a bottom part of the elastic element and disposed within the opening of the upper plate. The high impedance layer is in contact with a part of the circuit layer.

A key structure is stacked on a display panel. The key structure includes a trigger plate, a frame, at least an elastic triggering member, and at least a key. The trigger plate is formed with at least a hollow area for the display panel to partially expose and a solid area. The frame is disposed on the trigger plate and is formed with at least an opening opposite the hollow area. The key includes a key cap and a scissor member connected to the key cap, wherein the key cap has a cap body which is located in the opening and helps directly observing the hollow area and at least two skirts which extend from sides of the cap body and are covered by the frame.

A key structure is stacked on a display panel. The key structure includes a trigger plate, a frame, at least an elastic triggering member, and at least a key. The trigger plate is formed with at least a hollow area for the display panel to partially expose and a solid area. The frame is disposed on the trigger plate and is formed with at least an opening opposite the hollow area. The key includes a key cap and a scissor member connected to the key cap, wherein the key cap has a cap body which is located in the opening and helps directly observing the hollow area and at least two skirts which extend from sides of the cap body and are covered by the frame.

Key switches of the inventive subject matter are designed to give users the tactile feel of key switches from expensive mechanical keyboards without drawback typically associated with alternative key switches. In some embodiments, key switches described in this application are designed to function with a sheet of membrane switches, while in other embodiments, key switches of the inventive subject matter incorporate optical switching in place of membrane switching. Embodiments for use with membrane switching feature a plunger and rocker combination that prevents the pressure from a user's key press from being directly transferred to a membrane switch, thereby reducing wear and tear. In optical switching embodiments, pressing the key switch causes an actuator, e.g., come between an optical emitter/receiver pair to register a key press.

A key structure includes a casing, a covering member, a pressing element, a triggering post, a switch element. The casing has an opening. The opening is covered by the covering member. The pressing element is disposed within the opening and connected with the covering member. The pressing element includes a middle part and an extension part. The triggering post is installed on the middle part of the pressing element. The triggering post is extended in the direction toward the inner position of the casing. When an external force is applied to the middle part of the pressing element, the triggering post is moved toward the switch element to push the switch element. When the external force is applied to the extension part of the pressing element, the triggering post is correspondingly moved with the pressing element in an inclined manner to push the switch element.

A key structure includes a casing, a covering member, a pressing element, a triggering post, a switch element. The casing has an opening. The opening is covered by the covering member. The pressing element is disposed within the opening and connected with the covering member. The pressing element includes a middle part and an extension part. The triggering post is installed on the middle part of the pressing element. The triggering post is extended in the direction toward the inner position of the casing. When an external force is applied to the middle part of the pressing element, the triggering post is moved toward the switch element to push the switch element. When the external force is applied to the extension part of the pressing element, the triggering post is correspondingly moved with the pressing element in an inclined manner to push the switch element.

A keyswitch includes a cap, first and second support members slidably connected to the cap and opposite to each other, and first and second blocks formed on the cap. The cap is movable between a non-pressed position and a pressed position. The first support member abuts against the first block when the cap is located at the non-pressed position. The first block moves away from the first support member at a first gap when the cap moves downward from the non-pressed position. The first support member abuts against the cap when the cap is located at the non-pressed position, and abuts against the second block when the cap continues moving downward to the pressed position.

A key structure includes a keycap, a scissors-type connecting element, a first knocking part, a resilience element and a second knocking part. The scissors-type connecting element is coupled to a bottom surface of the keycap. The scissors-type connecting element includes an inner frame and an outer frame. The first knocking part is disposed within a space surrounded by the inner frame. The resilience element is located under the first knocking part. The second knocking part is coupled to the bottom surface of the keycap and faces the first knocking part. While the keycap is pressed down, the second knocking part knocks on the first knocking part, and the first knocking part is moved downwardly. When the keycap is not pressed down, the first knocking part is moved upwardly and returned to an original position in response to an elastic force of the resilience element.

A key structure includes a keycap, a scissors-type connecting element, a first knocking part, a resilience element and a second knocking part. The scissors-type connecting element is coupled to a bottom surface of the keycap. The scissors-type connecting element includes an inner frame and an outer frame. The first knocking part is disposed within a space surrounded by the inner frame. The resilience element is located under the first knocking part. The second knocking part is coupled to the bottom surface of the keycap and faces the first knocking part. While the keycap is pressed down, the second knocking part knocks on the first knocking part, and the first knocking part is moved downwardly. When the keycap is not pressed down, the first knocking part is moved upwardly and returned to an original position in response to an elastic force of the resilience element.