Optical Key Switch
Optical key switch became popular around 2016, due to the Bloody B840 Optical Switch Keyboard using the โBloody LK Optic 2 switchโ.
Optical switch is great because it does not need metal contact. Meaning, no wear, last longer, and easier to be water resistant.
![infra red optical switch 27658](ikm/infra_red_optical_switch_27658.gif)
![keychron optical low profile switch 2022-05-25](ikm/keychron_optical_low_profile_switch_2022-05-25.jpg)
Optical Switch Manufactures
Optical Key Switch keyboards
There are a lot. Here's a few example.