Clare foam and foil
|This article requires photographic illustration|
|Manufacturer||Clare, General Instrument|
Clare foam and foil is a type of foam and foil switch manufactured by Clare and seemingly also the parent company General Instrument. The series name of S-890 is tentatively identified with this series, but not confirmed in any way.
The earliest known example is from 1981, branded "CP CLARE" and marked "ASM MEXICO". This keyboard pre-dates the various foam and foil patents filed by General Instrument in 1982. A 1982 Cray keyboard has been found with a single "CP CLARE"-branded switch alongside unbranded switches, giving a small indication of the change in branding. A 1982 keyboard has been found with the PCB branded "General Instrument".
Like with various other foam and foil switch types from the likes of Key Tronic and Cherry, these switches use discrete modules to hold the slider and springs, mounted into a plate.
The following patents may be relevant:
|General Instrument Corporation||EP 0072784 Keyswitch design||1982-08-10||1983-02-23||Single-sided PCB with through-hole-soldered capacitor pads|
|General Instrument Corporation||US 4450332 Keyswitch design||1982-08-25||1984-05-22||This may be the switch series in question|
|General Instrument Corporation||US 4454562 Keyswitch with telescoping plunger||1982-09-15||1984-06-12|
|General Instrument Corporation||US 4453198 Linear feel keyswitch with hysteresis||1982-09-15||1984-06-05|
- Unidentified keyboard from 1981
- Cray Research keyboard from 1982 (GI PCB branded as Ampex; GI controller)
- Unidentified keyboard from 1982, marked "GENERAL INSTRUMENT | Keyboard Division" and model "S-890 Series"