Acoustic Keyboard Switch

Sound lives in mechanics, not firmware. By pairing a dual-leaf spring (for force) with a tiny resonant cavity (for tone) and adding a thumb-driven slider, one switch can physically retune itself—no tools, no extra electronics, zero compromise on profile or reliability.

Each key mates a stamped dual-leaf Cu-Be spring with a tuned acoustic cavity inside each key-cap. A low-profile TPU slider shifts the spring’s magnetic preload and narrows the cavity’s port in one motion. Slide back, the leaves couple firmly, the larger cavity resonates at ~1 kHz, and every press delivers a deep “thock.” Slide forward, the preload drops, the port constricts, resonance jumps to ~2 kHz, and the key snaps with a crisp “click.” The entire mechanism stands just 6 mm tall, requires no electronics, assembles with standard ABS/PC and Cu-Be tooling, and endures 10 million cycles without losing force, tone, or IP-rating.