Oriental Tech spring-over-membrane

Oriental Tech spring-over-membrane

Manufacturer	Oriental Tech?
Switch type	Progressive rate
Sense method	Spring-over-membrane
Rated lifetime	10 M
Actuation force	60±20 cN (standard) 90±25 cN (space bar)
Pretravel	2±0.6 mm
Total travel	3.5±0.4 mm
Keycap mount	Alps mount
Switch mount	Moulded to mounting plate

Oriental Tech spring-over-membrane is a provisional name for a type of switch presently only recorded as being in keyboards from Oriental Tech. It is a progressive-rate spring-over-membrane design, with an exterior return spring placed under the keycap. The manufacturer is not known, but it's likely that it was an in-house design by Oriental Tech, for their OK-100 series of keyboards.

Gallery

• 
  Standard switch (white slider)
• 
  Stiffer switch (blue slider)
• 
  Sliders and springs, with the heavier (taller) return spring on the left

• 
  Specifications from an OK-100M keyboard

Keyboards

• Oriental Tech OK-100 series