Mitsumi KDM

Mitsumi KDM
Manufacturer	Mitsumi
Switch type	Linear
Sense method	Metal contact
Total travel	ca. 3.8 mm
Keycap mount	Cruciform, round
Switch mount	Plate mount

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Mitsumi simplified is a linear, metal contact switch from Mitsumi.

Nomenclature[edit | edit source]

The moniker "Mitsumi simplified" follows a tradition of using the appellation "simplified" for switches that appear to be a cost-effective design compared to a brand's more complex offerings. However a Nakajima All typewriter with these switches has a PCB inscribed "KDM-A70YU", implies that the correct designation is "KDM Type".<ref name="Nakajima-All">https://imgur.com/a/ZLBFd</ref> "Mitsumi simplified" is the historically used designation for these switches but given the observed designations, "KDM" is more accurate. "KDM" would fit with the existing designation patterns for Mitsumi switches where "KCx" indicated type 2 Mitsumi standard mechanical, and the implication of "linear" or "momentary" for "KxM" per Mitsumi miniature mechanical.

Description[edit | edit source]

It shares keycap mount with the switches used in the Commodore 64; the cross mount type accepts C64 keycaps, and the round mount type fits the keystem adapter for the alternate action switch.

The switch uses bare metal contacts, which are also the terminals; the terminals can be seen running down the outside of the switch.

The switch is clearly branded on the base with the older (Kana) Mitsumi logo.

No other details are known to exist.