Oriental Tech spring-over-membrane
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| 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
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Specifications from an OK-100M keyboard
