Patent ID: 8405638

Claim:
A sensor system comprising: a plurality of optical touch sensors arranged in parallel with each other or in a matrix pattern, wherein each of the plurality of optical touch sensors includes a flexible optical path through which light propagates, a flexible metal layer disposed on the optical path, the metal layer having a thickness equal to or smaller than half a wavelength of the light that propagates through the optical path or the metal layer including a structure having a size equal to or smaller than half the wavelength of the light that propagates through the optical path, a flexible touch key configured to contact the metal layer when being bent, an incident light reflecting surface disposed on the optical path, the incident light reflecting surface making the light that propagates through the optical path be incident on the metal layer at an angle at which surface plasmon resonance occurs when the metal layer and the touch key are separated from each other, and a detector configured to detect reflected light from the metal layer and determine that the touch key is pressed in the case where an intensity of the reflected light increases.