NMB dome with slider

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NMB dome with slider

Manufacturer	NMB
Switch type	Tactile
Sense method	Membrane
Keycap mount	Proprietary

NMB dome with slider is a type of membrane rubber dome switch with sliders with a proprietary keycap mount.

Description

These keyboards use discrete domes that are glued to the top membrane sheet. The dome colour varies between keyboards, and this characteristic has yet to be studied or explained. In most rubber dome keyboards, the domes are made from a medium opaque grey or translucent colourless material, and the use of brightly-coloured domes is unusual.

The keycap mount is proprietary; the slider snaps onto a horizontal bar inside the slider.

Specifications

The specifications for the NMB RT-2200W cite the switch as an "Ultra Silent Membrane Keyswitch", and the keycaps are helpfully noted as being made of "Thermoplastic" with UL flammability rating 94 HB.

The interesting specifications given for model RT-2200W are:

Characteristic	Value
Contact material	Mylar with silver-carbon overlay
Keyswitch travel	0.140 ± 0.020 inch (3.56 ± 0.5 mm)
Travel to make	0.090 ± 0.020 inch (2.29 ± 0.5 mm)
Operating force	Momentary Action: 2.0 oz. nominal (55 grams)
Feel	Tactile
Life	Meets or exceeds 10 million cycles.

Whether these specifications hold true for the entire series is not known.

Keyboards

• Some AppleDesign Keyboards
• Some Dell QuietKey keyboards
• Some Compaq keyboards, e.g. Compaq 166516

Gallery

AppleDesign Keyboard

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  AppleDesign Keyboard with NMB switches

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  Membrane domes from the AppleDesign Keyboard

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  Membrane sheets and domes from the AppleDesign Keyboard

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  Sliders close-up, with one slider depressed (first column, third row in the picture)

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  Domes close-up

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  Sliders close-up

Digital RT10x

The sliders are normally colourless, as seen in the 2nd image of a Digital RT101, but the Digital RT102 keyboard has been found with black sliders:

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