Patent ID: 7407314

Claim:
An electronic device comprising: an array of indicators capable of exposing readable information to an outside of said electronic device along a side of said electronic device; a light source used for providing light to illuminate said array of indicators; and a light guide positioned at one side of said array of indicators along said side of said electronic device, said light source disposed at one end of said light guide, and said light guide capable of receiving said light from said light source and transmitting said light toward said array of indicators, said light guide comprising an array of apertures corresponding to said array of indicators in order for respectively accommodating said array of indicators therein, more than one aperture of said array of apertures configured to form at least one reflecting surface along a peripheral wall thereof so as to reflect said light inside said light guide from said light source toward other apertures of said array of apertures for illumination of said array of indicators therein, wherein a reflecting angle of said at least one reflecting surface is determined by the following formula: γ=η+α−90 where α is said reflecting angle of said at least one reflecting surface, η is an incidence angle of light rays, and γ is an angle of said at least one reflecting surface relative to an imaginary center line of said light guide.