Mitsumi KPQ Type

Mitsumi KPQ Type
Manufacturer	Mitsumi
Family	Mitsumi hybrid switch
Switch type	Tactile; linear (illuminated only)
Rated lifetime	10 M (4 mm); 5 M (3 mm)
Bounce time	5 ms
Tactile force	50±20 g
Actuation force	ca. 30 g
Total travel	4.0±0.5 mm; 3.0±0.5 mm
Keycap mount	Mitsumi mount

Mitsumi KPQ Type is a Mitsumi hybrid switch type; the linear equivalent is Mitsumi KPR Type. KPQ Type also covers stock keyboards and full custom OEM products made with these switches.

Description

KPQ Type keyboards use a conductive rubber foot to bridge traces on a single membrane sheet. A buckling rubber sleeve is placed under the keycap to provide tactility and return the key.

Where an integrated LED is required, the switch in question will be linear: the rubber sleeve would obstruct the LED. This can be seen in the Commodore Amiga 2000 keyboard, although that is KKQ Type.

Alternate action is provided by the Mitsumi membrane lock semi-discrete switch module.

Some equipment including the Commodore Amiga 2000 and Commodore CDTV use Mitsumi KKQ Type, which is visibly identical from above, but internally uses a PCB instead of a membrane sheet.