▎ 摘　　要

NOVELTY - An optical-based non-contact sensor has a light source for irradiating light, an optical fiber unit through which the light irradiated from the light source unit is guided, a reflective coating unit installed in the optical fiber unit to reflect light guided by the optical fiber, a nano-coating unit coated on the optical fiber unit, which is positioned adjacent to the user to induce a change in an electric charge of the optical fiber unit, and a light receiving unit for receiving the light reflected by the reflective coating unit in a state where the refractive index of a predetermined region of the optical fiber unit is changed by the charge change induced by the nano-coating unit. USE - Optical-based non-contact sensor used for detecting touched button. ADVANTAGE - The optical-based non-contact sensor comprises a light source unit for irradiating light, and an optical fiber unit for guiding the light irradiated from the light source, and hence ensures simple and efficient optical-type non contact sensor.