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 switch device described by this invention a reset assistant part arranged at the second end of male leg, and a ram, the reset assistant part provided with a holding station, both sidewalls of which are each provide with a saddle, both sides of the ram provided with a cam matching with the saddle, the ram hanging from the saddle through two cams. With the structure said above, not only a photoelectrical type switch of the scissor-leg structure is realized, but also the key is enabled to have an obvious stage sense and sound.

What is presented is a key module (100) comprising an actuation element (105) comprising a cam nose (135), wherein the actuation element (105) is supported to be movable along a movement axis (200) in a housing element (130, 110). Furthermore, the key module (100) comprises a contactor unit (115) with a contact nose (140) movable in the direction of the movement axis (200) and transverse to the direction of the movement axis (200). Also, the key module (100) comprises a contact element (120) formed and arranged for establishing electric contact with the contact nose (140). Moreover, the key module (100) comprises the housing element (130, 110) for accommodating the contact element (120), the contactor unit (115) and the actuation element (105), wherein the actuation element (105) and/or the cam nose (135) comprises at least one constructive element (400) formed to deflect the contact nose (140) from a rest position adjacent to the contact element (120) in the direction along and/or transverse to the movement axis (200) upon a defined movement of the actuation element (105), then abruptly release it so that the movable contact nose (140) returns to the rest position and strikes the contact element (120) and/or the housing element (130, 110), wherein electric contact with the contact element (120) is established and acoustic noise is produced.

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 keyboard device includes a key structure and a membrane circuit board. The membrane circuit board includes a membrane switch. The membrane switch is located under the key structure. The key structure includes a pedestal structure, a covering structure, a keycap, a connecting element, a dome-type elastomer and a knocking element. The keycap is installed on the covering structure. The connecting element is connected between the covering structure and the pedestal structure. The dome-type elastomer is arranged between the covering structure and the membrane circuit board. When the keycap is not depressed, the knocking element is supported on the connecting element. While the keycap is depressed, the knocking element knocks on the connecting element to generate an operating sound and provide the operating feedback to the user.

A middle illuminated button switch including a printed circuit board (PCB), a base and a cover. A guide core is arranged between the base and the cover, a through hole is arranged at the bottom of the base and under the guide core. A light guide groove is provided at the lower end surface of the guide core. A light-emitting element is arranged on the upper end of the PCB, and the light-emitting element is inserted into the base from the through hole and embedded in the light guide groove. Since the light-emitting element is embedded in the base from the bottom to the top, and the light is emitted to the outside from the middle through the guide core, so as to realize the light-emitting effect in the middle of the button.

Keyboards, input devices, and related systems include key mechanisms with keycaps and actuators that provide adjustable feedback in response to user input. The actuators are controllable to provide variable tactile force or audible feedback that is dependent upon the user input. Encoders are able to transduce a location or relative position of a keycap as it is being pressed over time, and a signal is provided to actuators to cause them to provide feedback corresponding to the position of the keycap as it moves. The feedback can change the feel or sound of the keycap based on the keycap positions, time of operation, velocity, user identity, and other factors. Thus, the feel or sound of a keyboard or related input device can be adjusted electronically for efficient testing and increased user customization and feedback modes.

A lever switch which is capable of preventing loud operating noise from being generated during stepwise operation of an operating lever. The lever switch has a case, a click feeling generator placed inside the case, and a switch moving body placed inside the case and rotated with respect to the case by operating the operating lever. The click feeling generator has trough portions that abut against a convex portion of the switch moving body. Click feelings are given by the convex portion of the switch moving body sequentially abutting against the trough portions in response to stepwise operations of the operating lever. The convex portion of the switch moving body is urged toward the click feeling generator. The click feeling generator and the case are placed away from each other with a space left between them in a direction in which the first case is urged.

A keyboard device includes a membrane circuit board, a base plate and a key structure. The base plate is located under the membrane circuit board. The key structure includes a lever structure, a resilience element or an interference structure. While the keycap is depressed, the lever structure, the resilience element or the interference structure collides with a keycap of the key structure, the base plate or a connecting element of the key structure. Consequently, the operating sound is generated, and the operating feedback is provided to the user.

A keyboard device includes a membrane circuit board, a base plate and a key structure. The base plate is located under the membrane circuit board. The key structure includes a lever structure, a resilience element or an interference structure. While the keycap is depressed, the lever structure, the resilience element or the interference structure collides with a keycap of the key structure, the base plate or a connecting element of the key structure. Consequently, the operating sound is generated, and the operating feedback is provided to the user.