Electromechanical sensor

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Douglas Engelbart's patent for the computer mouse, US patent 3541541, suggested several types of electromechanical sensor; which one was selected by the version built by Bill English, does not seem to be known.

The sensors used in early mice are not well-documented. The 1984 Macintosh 128K mouse used the familiar opto-mechanical sensor.<ref name="128K" />

Even after this point, at least one mouse was made with electromechanical sensors.

See: Electromechanical mice

Gallery

• 
  Alps electromechanical rotary encoder in a Key Tronic Professional Series Mouse

References

<references> <ref name="128K">iFixit — Macintosh 128K Teardown</ref> </references>