Button

A button, comprising:

• a substrate, comprising a physical key and a light emitting assembly;
• a frame body, mounted on the substrate and accommodating the physical key and the light emitting assembly, wherein a side of the frame body away from the substrate includes an opening;
• an optical pressure board assembly, slidably arranged in the frame body and covering the physical key and the light emitting assembly, wherein the optical pressure board assembly is adapted to moving in an operating direction towards the substrate from the opening to contact the physical key, so that the physical key generates a first manipulation signal, and the optical pressure board assembly is further adapted to converting a light beam provided by the light emitting assembly into a three-dimensional optical image projected from the opening;
• and
• an optical trigger switch, mounted on an outer side of the frame body and adapted to generating a second manipulation signal while sensing the three-dimensional optical image.