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Cross-section of a single Topre key position — a conical spring seated on a circular capacitive pad on the PCB, a rubber dome collared over the spring, and a slider riding the dome above, drawn in a single warm-grey stroke with a dusty-rose highlight where the spring meets the pad.
Deep Dives

How Topre's electrocapacitive switches actually work

Topre is not just another switch — it is a third sensing lineage, parallel to the MX-style contact switches and the Hall-effect newcomers. Understanding why HHKB and Realforce typists pay what they pay starts with the fact that a Topre keypress does not close a circuit at all.

thock11 min read
#hhkb — thock