LIGHTING APPARATUS AND MULTI-LIGHTING APPARATUS

摘要

PURPOSE: A light emitting device and a multi lighting light emitting device thereof are provided to totally reflect light which is radiated with an angle which is higher than a critical angle in the upper surface of a light guide sheet by forming a coating layer which has a lower refractive index than a refractive index of a light guide sheet. CONSTITUTION: A light guide sheet(10) is arranged in the lower part of a key top including a key button and has the optical permeability. A light source emits light towards a light guide sheet while being arranged in the side of a light guide sheet. A reflecting layer diffuses light which is emitted from the light source and passes through the inside of the light guide sheet to the upper side. A first coating layer(40) totally reflects light which is radiated to the upper side of the light guide sheet. A second coating layer(50) totally reflects light which is radiated to the lower-part of the light guide sheet. The first coating layer and the second coating layer are formed into materials which has lower refractive index than the light guide sheet.