A switch device, having a reset assistant part arranged at the second end of a male leg, and a ram; the reset assistant part being provided with a holding station, both sidewalls of which are each provided with a saddle, both sides of the ram being provided, with a cam matching with the saddle, the ram is hung from the saddle through two cams. Accordingly, a photoelectrical type switch of scissor-leg structure is realized, and the key is enabled to have an obvious stage sense and sound.

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.

Example implementations relate to keyboard keys. In some examples, a key of a keyboard may comprise a magnetic plate, a pole plate located adjacent to the magnetic plate, where a channel through the magnetic plate and the pole plate is located adjacent to a perimeter edge of the magnetic plate and a perimeter edge of the pole plate, a membrane covering the pole plate and the channel, a keycap located on top of the membrane, and a wire coil connected to the keycap and located in the channel.

A method for assembling an electro-permanent magnet (EPM) key assembly of an information handling system may comprise disposing a pair of scissor plate mounts framed onto a base contact assembly upward through a cap support plate opening within a cap support plate comprising a printed circuit board with pressure sensors to record keystrokes for mounting the EPM key assembly, operably connecting the base contact assembly to the cap support plate, disposing a ferromagnetic flange operably coupled to rotate with at least one scissor plate about a hinge downward through the cap support plate opening, operably connecting the pair of scissor plates to the base contact assembly such that each of the pair of scissor plates may rotate away from one another in the presence of downward force on a key cap, and situating the key cap atop the pair of scissor plates.

A method for assembling an electro-permanent magnet (EPM) key assembly of an information handling system may comprise disposing a pair of scissor plate mounts framed onto a base contact assembly upward through a cap support plate opening within a cap support plate comprising a printed circuit board with pressure sensors to record keystrokes for mounting the EPM key assembly, operably connecting the base contact assembly to the cap support plate, disposing a ferromagnetic flange operably coupled to rotate with at least one scissor plate about a hinge downward through the cap support plate opening, operably connecting the pair of scissor plates to the base contact assembly such that each of the pair of scissor plates may rotate away from one another in the presence of downward force on a key cap, and situating the key cap atop the pair of scissor plates.

An information handling system may include a processor to receive input from a trackpad at the information handling system, from a user; and an electropermanent magnet control system to control the activation of an electropermanent magnet (EPM) magnetically couplable to the trackpad to influence the force of actuation.

A replaceable key structure includes a key holder and a circuit board. The key holder is disposed above a circuit board. The key holder is formed with a mounting slot for selectively receiving a first key module or a second key module therein. A magnetic sensor and a contact connector are disposed on the circuit board positionally corresponding to the mounting slot of the key holder. The first key module has a shaft, and a magnetic element disposed on the bottom of the shaft. The magnetic sensor can output an analog signal when the magnetic element approaches. The second key module has a trigger switch which has two electrical terminals disposed on the bottom surface of the second key module. When the second key module is installed in the mounting slot, the electrical terminals can be electrically connected to the contact connector.

A replaceable key structure includes a key holder and a circuit board. The key holder is disposed above a circuit board. The key holder is formed with a mounting slot for selectively receiving a first key module or a second key module therein. A magnetic sensor and a contact connector are disposed on the circuit board positionally corresponding to the mounting slot of the key holder. The first key module has a shaft, and a magnetic element disposed on the bottom of the shaft. The magnetic sensor can output an analog signal when the magnetic element approaches. The second key module has a trigger switch which has two electrical terminals disposed on the bottom surface of the second key module. When the second key module is installed in the mounting slot, the electrical terminals can be electrically connected to the contact connector.

A position sensor has a plurality of moveable surfaces, each moveable surface having a region with an electrically conductive surface. Each moveable surface has an inductor which forms a magnetic field inducing eddy currents in the electrically conductive surface. The inductor is momentarily connected to a pre-charged capacitor, thereby forming an LC resonant circuit, and disconnected before a quarter cycle of the LC resonant period occurs. The voltage on the capacitor is read at the end of the measurement period and before the next capacitor pre-charge event. As the eddy currents generated in the electrically conductive surface by the inductor cause a damping of the LC resonant waveform, the voltage at the end of the measurement cycle varies monotonically with the position of the moveable surface.

An electro-permanent magnet (EPM) key assembly of an information handling system may comprise a pair of scissor plates operably connected to a base contact assembly including an EPM such that each of the pair of scissor plates may rotate away from one another in the presence of downward force on a key cap situated atop the pair of scissor plates for actuation of the EPM key assembly; the EPM comprising a low-coercivity magnet and a high-coercivity magnet; wherein an application of a first current pulse applied to an electrically conductive wire coiled around the low-coercivity magnet places the EPM in a first on state to assert a first magnetic field on a ferromagnetic flange operatively coupled to rotate with at least one scissor plate about a hinge; and wherein an application of a second current pulse applied to the electrically conductive wire places the EPM in a second on state to increase the magnetic field on the ferromagnetic flange.