I.Basic Principles
Standard mechanical switches rely on the physical contact of metal leaves to trigger a signal; magnetic switches utilize Hall-effect magnetic sensing technology. They have no physical contacts, instead relying on changes in the magnetic field to determine the stem’s position and output a trigger signal.
A permanent magnet is embedded within the switch stem, while a Hall sensor chip is mounted on the bottom housing. As the magnet moves up and down with the stem, the sensor captures changes in magnetic field strength in real-time to calculate the stem’s position. The keyboard’s microcontroller reads this positional data to determine when the key is triggered or released.
Key distinction: Traditional mechanical switches operate on a “contact-to-conduct” basis, whereas magnetic switches operate by “detecting the magnetic field and calculating position.”
II.Complete Workflow
1. Unpressed State: The stem is at its highest point, placing the magnet furthest from the Hall sensor. Magnetic field strength is at its minimum; the sensor determines the key is not pressed, and no signal is output.
2. Key Press: The finger pushes the stem down, moving it toward the bottom Hall sensor; the sensor detects a continuous increase in magnetic field strength.
3. Trigger Determination: When magnetic field strength reaches a preset threshold, the keyboard registers a key trigger and outputs a signal. Thanks to real-time position tracking, the trigger point can be freely adjusted via software—this is the Rapid Trigger (RT) function.
4. Rebound/Reset: Upon releasing the finger, the spring pushes the stem back up. The magnet moves away from the sensor, and the magnetic field drops below the threshold; the system registers the key as released and cuts the signal.
5. Continuous Sampling: The Hall chip continuously samples magnetic field data at high frequencies (thousands of times per second), tracking the stem’s position in real-time.
III.Key Technical Concepts
1. RT (Rapid Trigger)
Standard mechanical switches have fixed trigger and reset points, whereas magnetic switches allow for customizable trigger and reset positions.
In RT mode, the system registers a release upon even a slight upward movement (rebound) and re-triggers with a minimal downward press, enabling ultra-fast, repetitive inputs—a feature widely used in gaming.
2. Deadzone Setting
Software-defined deadzones are used to filter out minor magnetic field fluctuations caused by hand tremors or instability. Slight oscillation of the switch stem within the dead zone does not generate a trigger signal; a larger dead zone reduces the likelihood of accidental triggering but makes the response more sluggish.
3. Zero-point drift
Changes in ambient temperature or the weakening of the magnet’s magnetic force can cause a shift in the magnetic field baseline, resulting in a shift of the trigger point. Magnetic switch keyboards typically feature an automatic calibration function that recalibrates the zero point upon startup to correct drift issues.
4. Lifespan advantage due to contactless design
The absence of metal contact-leaf friction eliminates issues such as leaf oxidation, contact wear, and double-clicking, resulting in a theoretical lifespan far exceeding that of traditional mechanical switches.
IV.Pros and Cons of Magnetic Switches
Pros:
1. No physical contacts, resulting in virtually no contact wear and a long lifespan;
2. Software-adjustable trigger points; supports Rapid Trigger (RT) functionality, allowing for superior gaming responsiveness;
3. Customizable total travel and actuation travel; a single switch can provide various typing feels;
4. Free from double-clicking or signal dropout issues caused by leaf spring oxidation.
Cons:
1. Susceptible to magnetic fields and temperature fluctuations, leading to zero-point drift that requires periodic calibration;
2. High reliance on driver software; custom RT functions are unavailable without the driver;
3. Strong magnetic fields can interfere with the Hall effect sensor, causing detection errors;
4. Higher cost compared to standard mechanical switches.
