Apple hairpin spring
|Sense method||Metal contacts|
|Switch mount||PCB mount|
Terminals on either side of the switch are connected together when a flat, spiral spring is deflected downwards by the slider. A hairpin spring across the top of the switch provides the tactility and click sound. The patent provides a force curve, of unknown accuracy.
The case is fairly flat, and the switch is intended to be mounted directly onto the PCB. The slider is cruciform, of unknown dimensions. alps.tw's illustration shows white and yellow sliders; no reason for the yellow slider is known.
The manufacturer of the switch is not known. In Apple keyboards, the switch typically has a recessed Apple logo on the top, but the switch has also been found in a Rhino Robots Keyboard Emulator, PCB date 1989, with the Apple logo replaced with a hand-carved "G"; it looks like the switch OEM has altered the moulds by hand and run a fresh batch of switches, while Apple still retained the patent on the switch.
- Apple IIc (Apple branded) (first couple of years of production)
- Rhino Robots Keyboard Emulator ("G" branded)