Patent ID: 7733580

Claim:
A light emitting module comprising a light source and a lens element for changing a light from the light source so as to have a predetermined direction, the lens element comprising: a plurality of first refraction surfaces, located on an emission surface of the lens element so as to form concentric circles of different diameters with each concentric circle having an optical axis at the center of the lens element, operable to refract the light which is emitted from the light source at an emission angle θ, ranging from zero to θ 0 , so as to emit the light at a predetermined angle, a plurality of reflection surfaces, located on an incident surface of the lens element so as to form concentric circles of different diameters with each concentric circle having an optical axis at the center of the lens element, operable to reflect, to the emission surface of the lens element, the light emitted from the light source at an emission angle θ, larger than θ 0 , and a plurality of second refraction surfaces, provided on the emission surface of the lens element so as to form concentric circles of different diameters with each concentric circle having an optical axis at the center of the lens element, operable to refract the light reflected by the plurality of reflection surfaces, so as to emit the light at a predetermined angle, wherein θ represents an angle between the optical axis and a direction in which the light is emitted from the light source, the plurality of second refraction surfaces and the plurality of first refraction surfaces are alternately positioned on the emission surface of the lens element, and the plurality of reflection surfaces reflect the light to the plurality of second refraction surfaces in a one-to-one manner.